Bar Grating Welded Steel Grating (pages 14–35) Standard Welded: AMICO ® ’s welded grating is used universally for walkway and mezzanine decking applications. It is ideal for most general industrial and commercial uses. Standard welded grating is generally considered to include grating with bearing bars spaced at 1-3/16" or 15/16" and is available in carbon or stainless steel. Close-Mesh: Close-mesh grating is similar to standard grating except that the spacing of the bearing bars is closer, ranging from 7/16" to 13/16". It is suitable for applications requiring narrow spacing for aesthetic or functional rea- sons. It is available in carbon or stainless steel. Railroad: Welded grating with spacings of 1-9/16" and 1-11/16" meet the requirements for AAR approved safety walkway products. This grating is designed specifically for use as railcar brake steps, running boards, walkways and platforms. Heavy-Duty: Heavy-Duty uses thicker (1/4", 5/16", 3/8") and deeper bearing bars. Although the tables show bars as deep as 6", deeper grating can be custom fabricated on request. Heavy-Duty is used for airfields, highways, industrial floors, ramps, docks, reinforced concrete areas and specialty applications. Press-Locked Steel and Aluminum Grating (pages 15–21 / steel and pages 41–47 / aluminum) Because this grating is a system of interlocking, perpendicular bars, it provides a smooth clean look ideal for architectural applications such as grilles, dividers and screens. It is used in the same structural applications as its welded steel and rectangular aluminum counterparts. Materi- als include carbon steel, stainless steel or alu- minum. Spacings range from 7/16" to 1-3/16". Swage-Locked Aluminum Grating (pages 37-40) Swage-locked aluminum grating is manufactured with either an “I” or rectangular bearing bar. These bars are permanently locked to the cross rods with a swaging process which reshapes the rods. Because of the flange width, I-bars reduce the open spaces of the grating yet I-bar swage-locked is lighter weight and less costly than a rectangular bar grating with the same bar thickness. Duo-Grip™ Aluminum Planks (page 48) Duo-Grip™ planking is a one piece extruded plank with exceptional strength and stiffness-to- weight ratio due to its I-beam ribs. It is available in either unpunched, square punched or rectan- gular punched styles to suit lighting and ventila- tion considerations. The design provides con- tinuous walking surface for additional safety. Riveted Steel and Aluminum Grating (pages 50–51 / steel and pages 52–53 / aluminum) Riveted grating is especially practical for areas where rolling loads are used because of its smoother surface. It is available in both aluminum and steel. Riv-Dexteel ® (pages 54–55) Riv-Dexteel ® is a high strength grating which incorporates a truss style design through the use of a reticulated riveted bar in conjunction with a straight bearing bar. It has been used for nearly 75 years as bridge decking, curb inlet grates, industrial flooring, driveways across cul- verts and heavy traffic areas. 13 Material Selection Carbon Steel: Carbon steel provides an economical, high strength grating for use in most industrial and commercial applications. Aluminum: Lightweight, corrosion resistant and non-sparking alloys make aluminum ideal for use in chemical, petroleum, hydro and food process- ing plants, sewage, water and waste treatment facilities; munitions plants and other volatile areas; aboard ship; etc. Stainless Steel: Stainless steel is ideal for use in caustic atmospheres where corrosion resistance and minimum carbide precipitation are important considerations. It is especially applicable for chemical, food and hydro processing areas. Painted: One coat of manufacturer’s standard paint, applied in accord with the manufacturer’s standard practice. One shop coat of manufac- turer’s standard paint is designed to protect the grating and/or treads from the elements during transit. Meets NAAMM’s Metal Bar Grating Man- ual MBG531-00. (Note: Paint is not intended as a finish coat.) Gratings and/or treads stored at the jobsite shall be covered or under roof. Required covering is not the responsibility of the grating and/or tread supplier. Galvanizing: Grating specified to be galvanized shall have their exposed surfaces zinc-coated by the hot dip process after fabrication, with a coating of not less than 1.8 oz/ft 2 (550 g/m 2 of coated surface).
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Bar GratingWelded Steel Grating(pages 14–35)Standard Welded: AMICO®’s welded grating isused universally for walkway and mezzaninedecking applications. It is ideal for most generalindustrial and commercial uses. Standard weldedgrating is generally considered to include gratingwith bearing bars spaced at 1-3/16" or 15/16"and is available in carbon or stainless steel.
Close-Mesh: Close-mesh grating is similar tostandard grating except that the spacing of thebearing bars is closer, ranging from 7/16" to13/16". It is suitable for applications requiringnarrow spacing for aesthetic or functional rea-sons. It is available in carbon or stainless steel.
Railroad: Welded grating with spacings of 1-9/16"and 1-11/16" meet the requirements for AARapproved safety walkway products. This gratingis designed specifically for use as railcar brakesteps, running boards, walkways and platforms.
Heavy-Duty: Heavy-Duty uses thicker (1/4",5/16", 3/8") and deeper bearing bars. Althoughthe tables show bars as deep as 6", deepergrating can be custom fabricated on request.Heavy-Duty is used for airfields, highways,industrial floors, ramps, docks, reinforcedconcrete areas and specialty applications.
Press-Locked Steeland Aluminum Grating(pages 15–21 / steel and pages 41–47 / aluminum)Because this grating is a system of interlocking,perpendicular bars, it provides a smooth cleanlook ideal for architectural applications such asgrilles, dividers and screens. It is used in thesame structural applications as its welded steeland rectangular aluminum counterparts. Materi-als include carbon steel, stainless steel or alu-minum. Spacings range from 7/16" to 1-3/16".
Swage-Locked Aluminum Grating(pages 37-40)Swage-locked aluminum grating is manufacturedwith either an “I” or rectangular bearing bar.These bars are permanently locked to the crossrods with a swaging process which reshapesthe rods. Because of the flange width, I-barsreduce the open spaces of the grating yet I-barswage-locked is lighter weight and less costlythan a rectangular bar grating with the same barthickness.
Duo-Grip™ Aluminum Planks(page 48)Duo-Grip™ planking is a one piece extrudedplank with exceptional strength and stiffness-to-weight ratio due to its I-beam ribs. It is availablein either unpunched, square punched or rectan-gular punched styles to suit lighting and ventila-tion considerations. The design provides con-tinuous walking surface for additional safety.
Riveted Steel and Aluminum Grating(pages 50–51 / steel and pages 52–53 / aluminum)Riveted grating is especially practical for areaswhere rolling loads are used because of itssmoother surface. It is available in bothaluminum and steel.
Riv-Dexteel®
(pages 54–55)Riv-Dexteel® is a high strength grating whichincorporates a truss style design through the useof a reticulated riveted bar in conjunction with astraight bearing bar. It has been used for nearly75 years as bridge decking, curb inlet grates,industrial flooring, driveways across cul-verts and heavy traffic areas.
13
Material SelectionCarbon Steel: Carbon steel provides aneconomical, high strength grating for use inmost industrial and commercial applications.
Aluminum: Lightweight, corrosion resistant andnon-sparking alloys make aluminum ideal for usein chemical, petroleum, hydro and food process-ing plants, sewage, water and waste treatmentfacilities; munitions plants and other volatileareas; aboard ship; etc.
Stainless Steel: Stainless steel is ideal for use incaustic atmospheres where corrosion resistanceand minimum carbide precipitation are importantconsiderations. It is especially applicable forchemical, food and hydro processing areas.
Painted: One coat of manufacturer’s standardpaint, applied in accord with the manufacturer’sstandard practice. One shop coat of manufac-turer’s standard paint is designed to protect thegrating and/or treads from the elements duringtransit. Meets NAAMM’s Metal Bar Grating Man-ual MBG531-00. (Note: Paint is not intended as afinish coat.) Gratings and/or treads stored at thejobsite shall be covered or under roof. Requiredcovering is not the responsibility of the gratingand/or tread supplier.
Galvanizing: Grating specified to be galvanizedshall have their exposed surfaces zinc-coated bythe hot dip process after fabrication, with acoating of not less than 1.8 oz/ft2 (550 g/m2 ofcoated surface).
14
Steel Bar GratingWelded Steel Bar Grating is the most popular of all grating types due toits strength, cost-efficient production and ease of installation. Universallyused in most general industrial plants as well as commercial buildings, ithas wide applications as walkways, platforms, safety barriers, drainagecovers and ventilation grates.
It is also ideal for use as mezzanine decking since it supports thesame loads as comparable solid flooring. More than that, its cost savingopenness maximizes the circulation of air, light, heat, water and sound,while promoting cleanliness. And, where insurance codes permit, addi-tional sprinklers can often be eliminated. Standard panels are available inwidths of 2', 3' or 4'.
Welded steel bar grating is resistance welded to create a rugged, one-piece constructed panel. The bearing bars are automatically resistancewelded at the contact point with the cross bars and, under a combinationof high heat and pressure, are fused together to form a permanent joint.The cross bars provide a high degree of rigidity, yet retain a smooth flatsurface for free and easy walking.
Press-Locked Steel Bar Grating is often desirable because of itsclean, smooth look and excellent lateral support. It exhibits the samestrength, long life and openness as welded grating, although it is notrecommended for rolling loads. Instead of welding the joints, however,tremendous hydraulic pressure is used to bond the two close-toleranceslotted bars together. Permanent locking is achieved by forcing the deepcross bar into the notched bearing bar.
Further fabrication or galvanizing is not recommended after thematerial leaves AMICO®.
Steel Welded Railroad Grating, in 1-9/16" and 1-11/16" spacings, isAAR (Association of American Railroads) approved and specified forbrake steps, running boards, walkways and platforms for railroad cars.Designed and engineered specifically for railroad use, AMICO-Klemp®
railroad grating is used by both new car and car repair facilities since it isinterchangeable with other AAR approved gratings. The serrated bearingbars provide additional safety and the openness of bar grating minimizesbuild up of snow, ice and other debris.
19-W-4 19-W-2
15-W-4 15-W-2
13-W-4 13-W-2
11-W-4 11-W-2
8-W-4 7-W-4
10-W-4 10-W-2
25-W-4 27-W-4
19-P-4 19-P-2
15-P-4 15-P-2
7-P-2
13-P-4 13-P-2
11-P-4 11-P-2
10-P-4 10-P-2
8-P-4 8-P-2
7-P-4
PRESS-LOCKED STEEL BAR GRATINGSTEEL WELDED RAILROAD GRATING (AAR APPROVED)WELDED STEEL BAR GRATING
Std. Panel width 2'-0 & 3'-04'-0 wide on some styles of
Approx. Sec. ModBar Symbol Weight Per Ft.Size psf Of Width
3/4" x 1/8"
3/4" x 3/16"
1" x 1/8"
1" x 3/16"
1-1/4" x 1/8"
1-1/4" x 3/16"
1-1/2" x 1/8"
1-1/2" x 3/16"
1-3/4" x 3/16"
2" x 3/16"
2-1/4" x 3/16"
2-1/2" x 3/16"
0.118
0.178
0.211
0.316
0.329
0.493
0.474
0.711
0.967
1.263
1.599
1.974
SPAN (Direction of Bearing Bar)
LOAD & DEFLECTION TABLE
UDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCD
U = safe uniform load, psf (page 93)C = safe concentrated load, psf (page 93)D = deflection, inchesE = modulus of elasticity, 29,000,000 psiF = fiber stress, 18,000 psiMaterial: ASTM A-1011 standardDeflection: Spans and loads to the right ofthe bold line exceed 1/4" deflection for uni-form load of 100 psf which provides safepedestrian comfort. These can be exceededfor other types of loads with engineer’sapproval.
Serrated Bars: For serrated grating, thedepth of grating required for a specifiedload is 1/4" deeper than that shown inthe table.
Note: P-Press-Locked cross bars typically extend 1/8" each side. W-Welded cross rodsmay extend 1/8" each side. Panel widths do not include these extensions.
Approx. Sec. ModBar Symbol Weight Per Ft.Size psf Of Width
3/4" x 1/8"
3/4" x 3/16"
1" x 1/8"
1" x 3/16"
1-1/4" x 1/8"
1-1/4" x 3/16"
1-1/2" x 1/8"
1-1/2" x 3/16"
1-3/4" x 3/16"
2" x 3/16"
2-1/4" x 3/16"
2-1/2" x 3/16"
0.150
0.225
0.267
0.400
0.417
0.625
0.600
0.900
1.225
1.600
2.025
2.500
SPAN (Direction of Bearing Bar)
LOAD & DEFLECTION TABLE
UDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCD
U = safe uniform load, psf (page 93)C = safe concentrated load, psf (page 93)D = deflection, inchesE = modulus of elasticity, 29,000,000 psiF = fiber stress, 18,000 psiMaterial: ASTM A-1011Deflection: Spans and loads to the right ofthe bold line exceed 1/4" deflection for uni-form load of 100 psf which provides safepedestrian comfort. These can be exceededfor other types of loads with engineer’sapproval.
Serrated Bars: For serratedgrating, the depth of gratingrequired for a specified load is1/4" deeper than that shownin the table.
W/P-15 PANEL WIDTH (inches) Note: P-Press Locked cross bars typically extend 1/8" each side. W-Welded cross rods may extend 1/8" each side. Panel widths do not include these extensions.
Approx. Sec. ModBar Symbol Weight Per Ft.Size psf Of Width
3/4" x 1/8"
3/4" x 3/16"
1" x 1/8"
1" x 3/16"
1-1/4" x 1/8"
1-1/4" x 3/16"
1-1/2" x 1/8"
1-1/2" x 3/16"
1-3/4" x 3/16"
2" x 3/16"
2-1/4" x 3/16"
2-1/2" x 3/16"
0.173
0.260
0.308
0.462
0.481
0.721
0.692
1.038
1.413
1.846
2.337
2.885
SPAN (Direction of Bearing Bar)
LOAD & DEFLECTION TABLE
UDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCD
U = safe uniform load, psf (page 93)C = safe concentrated load, psf (page 93)D = deflection, inchesE = modulus of elasticity, 29,000,000 psiF = fiber stress, 18,000 psiMaterial: ASTM A-1011Deflection: Spans and loads to the right ofthe bold line exceed 1/4" deflection for uni-form load of 100 psf which provides safepedestrian comfort. These can be exceededfor other types of loads with engineer’sapproval.
Serrated Bars: For serratedgrating, the depth of gratingrequired for a specified load is1/4" deeper than that shownin the table.
W/P-13 PANEL WIDTH (inches) Note: P-Press-Locked cross bars typically extend 1/8" each side. W-Welded cross rods may extend 1/8" each side. Panel widths do not include these extensions.
Approx. Sec. ModBar Symbol Weight Per Ft.Size psf Of Width
3/4" x 1/8"
3/4" x 3/16"
1" x 1/8"
1" x 3/16"
1-1/4" x 1/8"
1-1/4" x 3/16"
1-1/2" x 1/8"
1-1/2" x 3/16"
1-3/4" x 3/16"
2" x 3/16"
2-1/4" x 3/16"
2-1/2" x 3/16"
0.205
0.307
0.364
0.545
0.568
0.852
0.818
1.227
1.670
2.182
2.761
3.409
SPAN (Direction of Bearing Bar)
LOAD & DEFLECTION TABLE
UDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCD
U = safe uniform load, psf (page 93)C = safe concentrated load, psf (page 93)D = deflection, inchesE = modulus of elasticity, 29,000,000 psiF = fiber stress, 18,000 psiMaterial: ASTM A-1011Deflection: Spans and loads to the right of thebold line exceed 1/4" deflection for uniformload of 100 psf which provides safe pedestriancomfort. These can be exceeded for othertypes of loads with engineer’sapproval.
Serrated Bars: For serratedgrating, the depth of gratingrequired for a specified load is1/4" deeper than thatshown in the table.
W/P-11 PANEL WIDTH (inches) Note: P-Press-Locked cross bars typically extend 1/8" each side. W-Welded cross rods may extend 1/8" each side. Panel widths do not include these extensions.
W/P-10 PANEL WIDTH (inches) Note: P-Press-Locked cross bars typically extend 1/8" each side. W-Welded cross rods may extend 1/8" each side. Panel widths do not include these extensions.
No. of Bars1/8" Bar
3/16" Bar
1/8" Bar3/16" Bar
No. of Bars
1/8" Bar3/16" Bar
No. of Bars
WELDED (W) 5/8" C/C of Bearing Bars PRESS-LOCKED (P) 5/8" C/C of Bearing Bars
NON-SERRATED & SERRATED NON-SERRATED & SERRATED
General: Loads and deflections are theoreticaland based on static loading.
Note: P-Press-Locked cross bars typically extend 1/8" each side. W-Welded cross rods may extend 1/8" each side. Panel widths do not include these extensions.
Approx. Sec. ModBar Symbol Weight Per Ft.Size psf Of Width
3/4" x 1/8"
3/4" x 3/16"
1" x 1/8"
1" x 3/16"
1-1/4" x 1/8"
1-1/4" x 3/16"
1-1/2" x 1/8"
1-1/2" x 3/16"
1-3/4" x 3/16"
2" x 3/16"
2-1/4" x 3/16"
2-1/2" x 3/16"
0.321
0.482
0.571
0.857
0.893
1.339
1.286
1.929
2.625
3.429
4.339
5.357
SPAN (Direction of Bearing Bar)
UDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCD
U = safe uniform load, psf (page 93)C = safe concentrated load, psf (page 93)D = deflection, inchesE = modulus of elasticity, 29,000,000 psiF = fiber stress, 18,000 psiMaterial: ASTM A-1011Deflection: Spans and loads to the right of
the bold line exceed 1/4" deflection foruniform load of 100 psf which pro-vides safe pedestrian comfort. Thesecan be exceeded for other types ofloads with engineer’s approval.
Serrated Bars: Forserrated grating, thedepth of gratingrequired for a speci-fied load is 1/4"
LOAD & DEFLECTION TABLEGeneral: Loads and deflections are theoreticaland based on static loading.
22
Steel Bar Grating
304 0.08 2.0 .75 18-20 0.045 0.030 8-10.5 0.10 — Type 304 alloys resist most oxidizing acids andcan withstand all ordinary rusting. They areimmune to foodstuffs, sterilizing solutions, mostof the organic chemicals and dyestuffs, and awide variety of inorganic chemicals. This gradeshould be considered for use unless some spe-cial mechanical, physical or fabricating charac-teristic is required.
304L 0.03 2.0 .75 18-20 0.045 0.030 8-12 0.10 — Type 304L is the low carbon modification ofType 304. This minimizes the problem of car-bide precipitation during welding.
316 0.08 2.0 .75 16-18 0.045 0.030 10-14 0.10 2-3% Mo Type 316 alloys have superior corrosion resis-tance especially to sulfurous acid compoundsand many chemicals used by the chemicalprocess industries. It is more resistant to pittingcorrosion than typical 18-8 alloys (Chromium-Nickel), such as Type 304.
316L 0.03 2.0 .75 16-18 0.045 0.030 10-14 0.10 2-3% Mo Type 316L is the low carbon modification ofType 316. This minimizes the problem of car-bide precipitation during welding.
When caustic atmospheres are encountered, or when corrosion resis-tance and/or minimum carbide precipitation are essential considerations,AMICO-Klemp® stainless steel grating is the answer. The longer lastingcapabilities of stainless steel under these special conditions make it aneconomical selection over the long term.
It is ideal for use in food processing areas, breweries, bottling plants,dairies and meat packing plants. Stainless steel can also be used inpower plants, sewage treatment plants, pumping stations and hydrocar-bon processing facilities where various caustic environments are normal.It also has application in shipboard and building industries where saline
solutions or atmospheres are present.
Stainless Steel Bar Grating is available in welded bar grating, riveted bargrating, swage-locked and press-locked bar grating. Specify S, RS, SR/SIand SP. Heavy-duty welded bar gratings and Riv-Dexteel® can also bemanufactured from stainless steel. Specify HS, RSL and RSH.
The alloys below are available as standard products. Each conforms withASTM A 167. In addition, special alloys are available upon request.
Unless otherwise specified, stainless steel grating shall have a mill finishas fabricated. “As fabricated” means as fabricated in AMICO-Klemp®’sshop without a subsequent finishing operation. Stainless steel will showsome discoloration around the joints due to welding. Finishes available toremove discoloration include sandblasting and electro-polishing, the latterbeing used where bright finish is desired. Shot blasting or wire brushing
should be avoided since these operations can cause iron contaminationwhich, if not removed, will cause rusting and discoloration of the surface.Such contamination can be removed by passivation. Electro-polishingleaves a passive surface. The swage-locked and press-locked processeswill not show discoloration due to welding.
Note: The above alloys conform with ASTM A167.
CHEMICAL COMPOSITIONAlloy Carbon Manganese Silicon Chromium Phosphorus Sulfur Nickel Nitrogen Other General
A Load and Deflection Table for S-19 and SP-19 is on the next page. All ofthe carbon steel bar grating products are available in stainless steel. Inaddition, AMICO-Klemp®’s rectangular bar swage-locked (SR) can beproduced in stainless steel.
For loads and deflections for other products such as riveted (RS),
heavy-duty (HS), Riv-Dexteel (RSL and RSH) and swage-locked (RSP),adjustments must be made to the carbon steel and aluminum tablesfound in this catalog. These adjustments will account for the differencesin modulus of elasticity and fiber stress between stainless steel, carbonsteel and aluminum.
Note: Modulus of Elasticity for Stainless Steel Alloys is 28,000,000 psi; Standardcarbon steel (ASTM A1011) is 29,000,000 psi; Heavy-duty carbon steel(ASTM A36) is 29,000,000 psi; and Aluminum (ASTM B221) is 10,000,000.Fiber Stress for Stainless Steel Alloys 304 and 316 is 20,000 psi; Stain-less Steel Alloys 304L and 316L is 16,500 psi; Standard carbon steel(ASTM A1011) is 18,000 psi; Heavy-duty carbon steel (ASTM A36) is20,000 psi; and Aluminum (ASTM B221, 6061-T6) is 12,000 psi.
Multiply U, C and Din the KRP aluminum
tables by:
Multiply U, C and Din the heavy-dutycarbon tables by:
Approx. Sec. ModBar Symbol Weight Per Ft.Size psf Of Width
3/4" x 1/8"
3/4" x 3/16"
1" x 1/8"
1" x 3/16"
1-1/4" x 1/8"
1-1/4" x 3/16"
1-1/2" x 1/8"
1-1/2" x 3/16"
1-3/4" x 3/16"
2" x 3/16"
2-1/4" x 3/16"
2-1/2" x 3/16"
0.118
0.178
0.211
0.316
0.329
0.493
0.474
0.711
0.967
1.263
1.599
1.974
SPAN (Direction of Bearing Bar)
UDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCD
U = safe uniform load, psf (page 93)C = safe concentrated load, psf (page 93)D = deflection, inchesE = modulus of elasticity, 28,000,000 psiF = fiber stress, 20,000 psiMaterial: ASTM A-167Deflection: Spans and loads to the right ofthe bold line exceed 1/4" deflection for uni-form load of 100 psf which provides safepedestrian comfort. These can be exceededfor other types of loads with engineer’sapproval.
Serrated Bars: For serrated grating, thedepth of grating required for a specifiedload is 1/4" deeper than that shown inthe table.
Note: For gratings with other than 1-3/16"bearing bar spacing, proportionate con-version factors apply.This table is for Alloys 304 and 316. ForAlloys 304L and 316L, F=16,500 psiand values for U, C and D should bemuliplied by .825.
Note: SP-Stainless Press-Locked cross bars typically extend 1/8" each side. S-Stainless Weldedcross rods may extend 1/8" each side. Panel widths do not include these extensions.
LOAD & DEFLECTION TABLEGeneral: Loads and deflections are theoreticaland based on static loading.
24
Steel Bar Grating
AMICO-Klemp® bar grating is approved for conformity to Association ofAmerican Railroads (AAR) Specifications, Rule 53 in the Field Manual ofthe AAR Interchange Rules.
AMICO-Klemp® bar grating is designed and engineered to meet AARspecifications for running boards, dome platforms, brake steps andcrossover platform applications.
AMICO-Klemp® conforms to the requirements for Group No. 1, Group No.2 and Group No. 3. Unsupported length for each of these Groups is 4', 7'and 10', respectively.
AAR Bar Size Symbol Approx. Weight UnsupportedGroup Number (psf) Length
1 1" x 1/8" 25-W-4 3.85 4'1 1" x 3/16" 25-W-4 5.67 4'1 1" x 3/16" 27-W-4 5.47 4'2 1-1/2" x 3/16" 27-W-4 7.88 7'3 2" x 3/16" 27-W-4 10.29 10'
W-25/W-27 PANEL WIDTH (inches) Note: W-Welded cross rods may extend 1/8" each side. Panel widths do not include these extensions.
No. of Bars1/8" Bar
3/16" Bar3/16" Bar
25-W-4
27-W-4
Cross Rods 4" C/CCross Rods 4" C/C
27-W-425-W-4
RAILROAD GRATING (AAR APPROVED)1-9/16" C/C of Bearing Bars 1-11/16" C/C of Bearing Bars
2525
Heavy-Duty Steel GratingHeavy-Duty Welded Grating has the strength for heavy-duty load areassuch as airfields, highways, industrial plants, truck and bus terminals,parking lots and railroad yards. Common uses are flooring, driveways,subway and tunnel ventilation grilles, curb inlet grates, ramps, docks, etc.
It is a sturdy grating to carry loads and maintain the same level overmany years of use. Whenever rolling wheel loads are to be used over thegrating, we recommend that the grating be load banded to add lateralstrength. Serrations are available on bars up to 3/8" thick to provideadditional traction for rolling loads.
Standard heavy-duty bar grating is resistance-welded for durability,strength and safety using an automated electric/hydraulic weldingprocess. High temperatures, combined with high pressure, fuse thebearing bars and cross bars together to form a permanent joint.
Also, AMICO-Klemp® is one of the few manufacturers that has thecapability of providing you with those “really big” grates. Our heavy-dutyfabrication department regularly custom fabricates grating to meet spe-cific project requirements. Virtually any bar size and depth can be madeto order.
15-W-4 15-W-2U = safe uniform load, psf (page 93)C = safe concentrated load, psf (page 93)D = deflection, inchesE = modulus of elasticity, 29,000,000 psiF = fiber stress, 20,000 psiMaterial: ASTM A-36Serrated Bars: For serrated grating, the depth of grating required for a spec-ified load is 1/4" deeper than that shown in the table.General: Loads and deflections are theoretical and based on static loading.Deflection: Spans and loads to the right of the bold line exceed 1/4" deflec-tion for uniform load of 100 psf which provides safe pedestrian comfort.These can be exceeded for other types of loads with engineer’s approval.For deflections of uniform and concentrated loads, consult AMICO-Klemp®’sengineering departments.
19-H-4 19-H-2 U = safe uniform load, psf (page 93)C = safe concentrated load, psf (page 93)D = deflection, inchesE = modulus of elasticity, 29,000,000 psiF = fiber stress, 20,000 psiMaterial: ASTM A-36Serrated Bars: For serrated grating, the depth of grating required for aspecified load is 1/4" deeper than that shown in the table.General: Loads and deflections are theoretical and based on static loading.Deflection: Spans and loads to the right of the bold line exceed 1/4" deflec-tion for uniform load of 100 psf which provides safe pedestrian comfort.These can be exceeded for other types of loads with engineer’s approval.For deflections of uniform and concentrated loads, consult AMICO-Klemp®’sengineering departments.
Steel Bar Grating Heavy-DutyHEAVY-DUTY WELDED (H) 1-3/16" C/C Bearing Bars
22-H-4 22-H-2 U = safe uniform load, psf (page 93)C = safe concentrated load, psf (page 93)D = deflection, inchesE = modulus of elasticity, 29,000,000 psiF = fiber stress, 20,000 psiMaterial: ASTM A-36Serrated Bars: For serrated grating, the depth of grating required for a spec-ified load is 1/4" deeper than that shown in the table.General: Loads and deflections are theoretical and based on static loading.Deflection: Spans and loads to the right of the bold line exceed 1/4" deflec-tion for uniform load of 100 psf which provides safe pedestrian comfort.These can be exceeded for other types of loads with engineer’s approval.For deflections of uniform and concentrated loads, consult AMICO-Klemp®’sengineering departments.
Steel Bar Grating Heavy-DutyHEAVY-DUTY WELDED (H) 1-3/8" C/C Bearing Bars
30-H-4 30-H-2 U = safe uniform load, psf (page 93)C = safe concentrated load, psf (page 93)D = deflection, inchesE = modulus of elasticity, 29,000,000 psiF = fiber stress, 20,000 psiMaterial: ASTM A-36Serrated Bars: For serrated grating, the depth of grating required for a spec-ified load is 1/4" deeper than that shown in the table.General: Loads and deflections are theoretical and based on static loading.Deflection: Spans and loads to the right of the bold line exceed 1/4" deflec-tion for uniform load of 100 psf which provides safe pedestrian comfort.These can be exceeded for other types of loads with engineer’s approval.For deflections of uniform and concentrated loads, consult AMICO-Klemp®’sengineering departments.
Steel Bar Grating Heavy-DutyHEAVY-DUTY WELDED (W) 1-7/8" C/C Bearing Bars
38-H-4 38-H-2 U = safe uniform load, psf (page 93)C = safe concentrated load, psf (page 93)D = deflection, inchesE = modulus of elasticity, 29,000,000 psiF = fiber stress, 20,000 psiMaterial: ASTM A-36Serrated Bars: For serrated grating, the depth of grating required for aspecified load is 1/4" deeper than that shown in the table.General: Loads and deflections are theoretical and based on static loading.Deflection: Spans and loads to the right of the bold line exceed 1/4" deflec-tion for uniform load of 100 psf which provides safe pedestrian comfort.These can be exceeded for other types of loads with engineer’s approval.For deflections of uniform and concentrated loads, consult AMICO-Klemp®’sengineering departments.
Steel Bar Grating Heavy-DutyHEAVY-DUTY WELDED (H) 2-3/8" C/C Bearing Bars
H-38 PANEL WIDTH (inches) Note: H-Heavy Duty cross rods may extend 1/8" each side. Panel widths do not include these extensions.
Steel Bar Grating Heavy-Duty38-H-4 & 38-H-2 (continued)
NON-SERRATED & SERRATED
3636
Corrosion resistant, non-sparking, rustproof aluminum grating has manyapplications due to its light weight and high strength. It is ideally suitedfor use in corrosive environments and finds wide applications as walk-ways and platforms in sewage treatment plants, refineries, chemical pro-cessing plants, pumping and compressor stations, and aboard ships andbarges. Because it does not rust, it is commonly used in breweries, bot-tling plants, and food preparation and storage facilities. In munitionplants, other volatile industries and areas, its non-sparking propertiesmake it a must for safety. It is available in standard or anodized finishes.
Swage-Locked II-Bar Grating is the most widely used and providesthe strength equal to a rectangular bar of the same depth, but at far lessweight and cost. The I-bars are permanently locked to the cross rods(positioned every 2" or 4") by a swaging process.
Swage-Locked Rectangular Bar Grating uses the swaging processto permanently lock the cross rods (positioned every 2" or 4") to the rec-tangular bars.
Press-Locked Rectangular Bar Grating is constructed with the twoclose-tolerance slotted bars bonded together (positioned every 2" or 4")using tremendous hydraulic pressure. Permanent locking is achieved byforcing the deep cross bar into the bearing bar. Both the cross bars andthe bearing bars provide walking surfaces in the press-locked design.
Rectangular bar grating in either the swage-locked or press-lockedstyles is your best choice when lateral stiffness is required. The rectangu-lar bar is also available in a serrated surface for additional safety.
19-SII-4 19-SII-2
15-SII-4 15-SII-2
SWAGE-LOCKED I-BAR ALUMINUM GRATING
19-SR-4 19-SR-2
15-SR-4 15-SR-2
SWAGE-LOCKED RECTANGULAR BAR ALUMINUM GRATING PRESS-LOCKED RECTANGULAR BAR ALUMINUM GRATING
Approx. Sec. ModBar Symbol Weight Per Ft.Size psf Of Width
1" x 1/4"
1-1/4" x 1/4"
1-1/2" x 1/4"
1-3/4" x 1/4"
2" x 1/4"
2-1/4" x 1/4"
2-1/2" x 1/4"
0.316
0.493
0.711
0.967
1.263
1.599
1.974
1.98
2.30
2.35
2.66
2.71
3.02
3.08
3.39
3.45
3.76
3.81
4.12
4.21
4.52
SPAN (Direction of Bearing Bar)
LOAD & DEFLECTION TABLE
UDCDUDCDUDCDUDCDUDCDUDCDUDCD
U = safe uniform load, psf (page 93)C = safe concentrated load, psf (page 93)D = deflection, inchesE = modulus of elasticity, 10,000,000 psiF = fiber stress, 12,000 psiMaterial: ASTM B-221, 6063 or 6061Deflection: Spans and loads to the right ofthe bold line exceed 1/4” deflection for uni-form load of 100 psf which provides safe
pedestrian comfort. These can beexceeded for other types of loads withengineer’s approval.General: Loads and deflections are
theoretical and based onstatic loading.Finish: Mill finish unlessotherwise specified.
Approx. Sec. ModBar Symbol Weight Per Ft.Size psf Of Width
1" x 1/4"
1-1/4" x 1/4"
1-1/2" x 1/4"
1-3/4" x 1/4"
2" x 1/4"
2-1/4" x 1/4"
2-1/2" x 1/4"
0.400
0.625
0.900
1.225
1.600
2.025
2.500
2.42
2.73
2.90
3.19
3.34
3.64
3.79
4.10
4.26
4.57
4.71
5.02
5.21
5.52
SPAN (Length of Bearing Bar)
LOAD & DEFLECTION TABLE
UDCDUDCDUDCDUDCDUDCDUDCDUDCD
U = safe uniform load, psf (page 93)C = safe concentrated load, psf (page 93)D = deflection, inchesE = modulus of elasticity, 10,000,000 psiF = fiber stress, 12,000 psiMaterial: ASTM B-221, 6063 or 6061Deflection: Spans and loads to the right ofthe bold line exceed 1/4” deflection for uni-form load of 100 psf which provides safe
pedestrian comfort. These can beexceeded for other types of loads withengineer’s approval.General: Loads and deflections are
theoretical and based on static loading.Finish: Mill finish unless otherwise specified.
24" 30" 36" 42" 48" 54"
38
Aluminum Bar GratingII-BAR SWAGE-LOCKED 15/16" C/C Bearing Bars
Note: Includes 1/4" (1/8" each side) for extended cross rods on swage-locked (SI).
40
Cross Rods 4" C/C Cross Rods 2" C/C
8-SII-4 8-SII-2
Aluminum Bar GratingII-BAR SWAGE-LOCKED CLOSE-MESH 1/2" C/C Bearing Bars
U = safe uniform load, psf (page 93)C = safe concentrated load, psf (page 93)D = deflection, inchesE = modulus of elasticity, 10,000,000 psiF = fiber stress, 12,000 psiMaterial: ASTM B-221, 6063 or 6061Deflection: Spans and loads to the right ofthe bold line exceed 1/4" deflection for uni-form load of 100 psf which provides safepedestrian comfort. These can be exceededfor other types of loads with engineer’sapproval.
Serrated Bars: For serrated grating, thedepth of grating required for a specified load is 1/4" deeper than that shown inthe table.
General: Loads anddeflections are theo-retical and based onstatic loading.
Finish: Mill fin-ish unless other-wise specified.
41
Cross Rods 4" C/C Cross Rods 2" C/C
7-SII-4 7-SII-2
Aluminum Bar GratingII-BAR SWAGE-LOCKED CLOSE-MESH 7/16" C/C Bearing Bars
U = safe uniform load, psf (page 93)C = safe concentrated load, psf (page 93)D = deflection, inchesE = modulus of elasticity, 10,000,000 psiF = fiber stress, 12,000 psiMaterial: ASTM B-221, 6063 or 6061Deflection: Spans and loads to the right ofthe bold line exceed 1/4” deflection for uni-form load of 100 psf which provides safepedestrian comfort. These can be exceededfor other types of loads with engineer’sapproval.Serrated Bars: For serrated grating, the depthof grating required for a specified load is 1/4"deeper than that shown in the table.General: Loads and deflections are theoreti-cal and based on static loading.Finish: Mill finish unless otherwise specified.
U = safe uniform load, psf (page 93)C = safe concentrated load, psf (page 93)D = deflection, inchesE = modulus of elasticity, 10,000,000 psiF = fiber stress, 12,000 psiMaterial: ASTM B-221, 6063 or 6061Deflection: Spans and loads to the right ofthe bold line exceed 1/4” deflection for uni-form load of 100 psf which provides safepedestrian comfort. These can be exceededfor other types of loads with engineer’sapproval.Serrated Bars: For serrated grating, the depthof grating required for a specified load is 1/4"deeper than that shown in the table.General: Loads and deflections are theoreti-cal and based on static loading.Finish: Mill finish unless otherwise specified.
SR/AP-15 PANEL WIDTH (inches) Note: Includes 1/4" (1/8" each side) for extended cross rods on swage-locked (SR) and extended cross bars on press-locked (AP).
Approx. Sec. ModBar Symbol Weight Per Ft.Size psf Of Width
3/4" x 1/8"
3/4" x 3/16"
1" x 1/8"
1" x 3/16"
1-1/4" x 1/8"
1-1/4" x 3/16"
1-1/2" x 1/8"
1-1/2" x 3/16"
1-3/4" x 3/16"
2" x 3/16"
2-1/4" x 3/16"
2-1/2" x 3/16"
0.173
0.260
0.308
0.462
0.481
0.721
0.692
1.038
1.413
1.846
2.337
2.885
2.0
2.4
3.0
3.5
2.6
2.9
3.9
4.4
3.3
3.7
4.9
5.6
3.8
4.3
5.7
6.4
6.6
7.3
7.4
8.1
8.3
8.9
9.1
9.8
SPAN (Direction of Bearing Bar)
LOAD & DEFLECTION TABLE
UDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCD
U = safe uniform load, psf (page 93)C = safe concentrated load, psf (page 93)D = deflection, inchesE = modulus of elasticity, 10,000,000 psiF = fiber stress, 12,000 psiMaterial: ASTM B-221, 6063 or 6061Deflection: Spans and loads to the right ofthe bold line exceed 1/4” deflection for uni-form load of 100 psf which provides safepedestrian comfort. These can be exceededfor other types of loads with engineer’sapproval.Serrated Bars: For serrated grating, the depthof grating required for a specified load is 1/4"deeper than that shown in the table.General: Loads and deflections are theoreti-cal and based on static loading.Finish: Mill finish unless otherwise specified.
Cross Bars 4" C/C Cross Bars 2" C/C
13-AP-4 13-AP-2
Note: Includes 1/4" (1/8" each side) for extended cross bars on press-locked (AP).
U = safe uniform load, psf (page 93)C = safe concentrated load, psf (page 93)D = deflection, inchesE = modulus of elasticity, 10,000,000 psiF = fiber stress, 12,000 psiMaterial: ASTM B-221, 6063 or 6061Deflection: Spans and loads to the right ofthe bold line exceed 1/4” deflection for uni-form load of 100 psf which provides safepedestrian comfort. These can be exceededfor other types of loads with engineer’sapproval.Serrated Bars: For serrated grating, the depthof grating required for a specified load is 1/4"deeper than that shown in the table.General: Loads and deflections are theoreti-cal and based on static loading.Finish: Mill finish unless otherwise specified.
Approx. Sec. ModBar Symbol Weight Per Ft.Size psf Of Width
3/4" x 1/8"
3/4" x 3/16"
1" x 1/8"
1" x 3/16"
1-1/4" x 1/8"
1-1/4" x 3/16"
1-1/2" x 1/8"
1-1/2" x 3/16"
1-3/4" x 3/16"
2" x 3/16"
2-1/4" x 3/16"
2-1/2" x 3/16"
0.225
0.338
0.400
0.600
0.625
0.938
0.900
1.350
1.838
2.400
3.038
3.750
2.48
2.81
3.71
4.21
3.20
3.53
4.79
5.29
4.02
4.47
6.03
6.70
4.73
5.19
7.10
7.77
8.17
8.84
9.24
9.91
10.31
10.98
11.38
12.05
SPAN (Direction of Bearing Bar)
LOAD & DEFLECTION TABLE
UDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCD
U = safe uniform load, psf (page 93)C = safe concentrated load, psf (page 93)D = deflection, inchesE = modulus of elasticity, 10,000,000 psiF = fiber stress, 12,000 psiMaterial: ASTM B-221, 6063 or 6061Deflection: Spans and loads to the right ofthe bold line exceed 1/4” deflection for uni-form load of 100 psf which provides safepedestrian comfort. These can be exceededfor other types of loads with engineer’sapproval.Serrated Bars: For serrated grating, the depthof grating required for a specified load is 1/4"deeper than that shown in the table.General: Loads and deflections are theoreti-cal and based on static loading.Finish: Mill finish unless otherwise specified.
Cross Bars 4" C/C Cross Bars 2" C/C
10-AP-4 10-AP-2
AP-10 PANEL WIDTH (inches) Note: Includes 1/4" (1/8" each side) for extended cross bars on press-locked (AP).
Approx. Sec. ModBar Symbol Weight Per Ft.Size psf Of Width
3/4" x 1/8"
3/4" x 3/16"
1" x 1/8"
1" x 3/16"
1-1/4" x 1/8"
1-1/4" x 3/16"
1-1/2" x 1/8"
1-1/2" x 3/16"
1-3/4" x 3/16"
2" x 3/16"
2-1/4" x 3/16"
2-1/2" x 3/16"
0.281
0.422
0.500
0.750
0.781
1.172
1.125
1.688
2.297
3.000
3.797
4.688
SPAN (Direction of Bearing Bar)
SR/AP-8 PANEL WIDTH (inches)
LOAD & DEFLECTION TABLE
UDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCD
U = safe uniform load, psf (page 93)C = safe concentrated load, psf (page 93)D = deflection, inchesE = modulus of elasticity, 10,000,000 psiF = fiber stress, 12,000 psiMaterial: ASTM B-221, 6063 or 6061Deflection: Spans and loads to the right ofthe bold line exceed 1/4” deflection for uni-form load of 100 psf which provides safepedestrian comfort. These can be exceededfor other types of loads with engineer’sapproval.Serrated Bars: For serrated grating, the depth
of grating required for a specifiedload is 1/4" deeper than that shown inthe table.General: Loads and deflections aretheoretical and based on static load-ing.Finish: Mill finish unless otherwisespecified.
U = safe uniform load, psf (page 93)C = safe concentrated load, psf (page 93)D = deflection, inchesE = modulus of elasticity, 10,000,000 psiF = fiber stress, 12,000 psiMaterial: ASTM B-221, 6063 or 6061Deflection: Spans and loads to the right ofthe bold line exceed 1/4" deflection for uni-form load of 100 psf which provides safepedestrian comfort. These can be exceededfor other types of loads with engineer’sapproval.Serrated Bars: For serrated grating, the depthof grating required for a specified load is 1/4"
deeper than that shown in the table.General: Loads and deflections aretheoretical and based on static loading.Finish: Mill finish unless otherwisespecified.
AP-7 PANEL WIDTH (inches) Note: Includes 1/4" (1/8" each side) for extended cross bars on press-locked (AP).
A Duo-Grip™ grating panel consists of 6" wide planks of extruded alu-minum, welded to each other to form panels. Panel ends have an
extruded aluminum end bar welded in place. Grating is availableunpunched or punched in one of the standard patterns.
SymbolDuo-GripDepth
84"
78"
Approx.Weight
psfSec.Mod.
Mom. ofInt.
Aluminum Grating
3/4"
1"
1-1/4"
1-1/2"
1-3/4"
2"
2-1/4"
2-1/2"
24" 30" 36" 42" 48" 54"
DUO-GRIP™ EXTRUDED
Duo-Grip™ Planking, a one-piece extruded 26' long plank (standard),is available only from AMICO-Klemp® and has an exceptional strength andstiffness-to-weight ratio due to its integral I-beam ribs. It is available ineither unpunched, square punched or rectangular punched styles to suitlighting and ventilation considerations. The 6" wide panels are weldedtogether to form the desired panel width and an extruded aluminum endbar is welded into place. The design provides a surer walking surface foradditional safety.
50
Riveted GratingRiveted Bar Grating is the first choice by many engineers for many appli-cations. Compared to welded or swaged-locked grating, riveted has agreater load carrying capacity for the same span and depth of grating.Reticulated bars, riveted to the bearing bars increase resistance to buck-ling caused by vehicular loading conditions.
AMICO-Klemp® riveted carbon steel and aluminum gratings utilize riv-ets which are individually cold-pressed using hydraulically and mechani-cally operated riveting tools. Thus, the bearing bars and reticulated barsare sealed together as a high-strength joint, freeing the grating from theresidual stresses that cause warp and joint failures.
It is unparalleled where rolling stock and wheeled equipment are used,especially those with casters. The reticulated bars present a smoothersurface for this traffic. It is very popular for use as flooring, ramps, docksand other surfaces and it is ideally suited for walkways because of itsadded walking comfort.
AMICO-Klemp® can match your existing riveted grating when you arereplacing or expanding your installation. On special order, heavy-duty barsizes and/or widths greater than shown are also available.
18-R-7 18-R-3
12-R-7 12-R-3
STEEL & ALUMINUM RIVETED GRATING
Note: Spacing for riveted grating is inside to inside of bearing bars.
51
18-R-7
18-R-3
18-R-7
18-R-3
18-R-7
18-R-3
18-R-7
18-R-3
18-R-7
18-R-3
18-R-7
18-R-3
18-R-7
18-R-3
18-R-7
18-R-3
18-R-7
18-R-3
18-R-7
18-R-3
18-R-7
18-R-3
18-R-7
18-R-3
96" 108"
Approx. Sec. ModBar Symbol Weight Per Ft.Size psf Of Width
SPAN (Direction of Bearing Bar) U = safe uniform load, psf (page 93)C = safe concentrated load, psf (page 93)D = deflection, inchesE = modulus of elasticity, 29,000,000 psiF = fiber stress, 18,000 psiMaterial: ASTM A-1011Deflection: Spans and loads to the right ofthe bold line exceed 1/4" deflection for uni-form load of 100 psf which provides safepedestrian comfort. These can be exceededfor other types of loads with engineer’sapproval.Serrated Bars: Normally we serrate the retic-uline bar and raise it slightly above the topsurface of the bearing bars. We can also ser-
rate the bearing bars. Whenbearing bars are serrated,the depth of grating requiredfor a specified load is 1/4"deeper than that shown inthe table.General: Loads and deflec-tions are theoretical and
based onstatic loading.Finish: Millfinish unlessotherwisespecified.
U = safe uniform load, psf (page 93)C = safe concentrated load, psf (page 93)D = deflection, inchesE = modulus of elasticity, 29,000,000 psiF = fiber stress, 18,000 psiMaterial: ASTM A-1011Deflection: Spans and loads to the right ofthe bold line exceed 1/4" deflection for uni-form load of 100 psf which provides safepedestrian comfort. These can be exceededfor other types of loads with engineer’sapproval.
Serrated Bars: Normally we serrate thereticuline bar and raise it slightly above thetop surface of the bearing bars. We can
also serrate the bearingbars. When bearing bars areserrated, the depth of grat-ing required for a specifiedload is 1/4" deeper than thatshown in the table.General: Loads and deflec-tions are theoretical and
based onstatic loading.Finish: Millfinish unlessotherwisespecified.
Approx. Sec. ModBar Symbol Weight Per Ft.Size psf Of Width
1" x 1/8"
1" x 3/16"
1-1/4" x 1/8"
1-1/4" x 3/16"
1-1/2" x 1/8"
1-1/2" x 3/16"
1-3/4" x 3/16"
2" x 3/16"
2-1/4" x 3/16"
2-1/2" x 3/16"
0.200
0.286
0.313
0.446
0.450
0.643
0.875
1.143
1.446
1.786
2.7
3.0
3.2
3.6
3.0
3.4
3.8
4.1
3.8
4.2
4.6
5.0
5.1
5.6
5.7
6.1
6.2
6.6
6.7
7.1
SPAN (Direction of Bearing Bar)
LOAD & DEFLECTION TABLE
UDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCD
U = safe uniform load, psf (page 93)C = safe concentrated load, psf (page 93)D = deflection, inchesE = modulus of elasticity, 10,000,000 psiF = fiber stress, 12,000 psiMaterial: ASTM B-221Deflection: Spans and loads to the right ofthe bold line exceed 1/4" deflection for uni-form load of 100 psf which provides safepedestrian comfort. These can be exceededfor other types of loads with engineer’sapproval.
Serrated Bars: Normally weserrate the reticuline bar andraise it slightly above thetop surface of the bearingbars. We can also ser-rate the bearing bars. Whenbearing bars are serrated,the depth of grating required
for a spec-ified loadis 1/4"deeperthan thatshown inthe table.General:Loads anddeflectionsare theo-retical andbased onstatic loading.Finish:Mill finishunlessotherwisespecified.
7" Rivet Centers–1/4" Dia. Rivets
3-1/2" Rivet Centers–1/4" Dia. Rivets
18-AR-7 18-AR-3
3/4"
x 1
/8" C
RIM
P BA
R1"
x 1
/8" C
RIM
P BA
R
18-AR-7 & 18-AR-3 PANEL WIDTH (inches) Note: Dimensions include 1/4" for rivet heads (1/8" each side).
No. of Bars 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 171/8" Bar
U = safe uniform load, psf (page 93)C = safe concentrated load, psf (page 93)D = deflection, inchesE = modulus of elasticity, 10,000,000 psiF = fiber stress, 12,000 psiMaterial: ASTM B-221Deflection: Spans and loads to the right ofthe bold line exceed 1/4" deflection for uni-form load of 100 psf which provides safepedestrian comfort. These can be exceededfor other types of loads with engineer’sapproval.Serrated Bars: Normally we serrate the retic-uline bar and raise it slightly above the topsurface of the bearing bars. We can also ser-
rate the bearing bars. Whenbearing bars are serrated,the depth of grating requiredfor a specified load is 1/4"deeper than that shown inthe table.General: Loads and deflec-tions are theoretical and
based onstatic loading.Finish: Millfinish unlessotherwisespecified.
Riveted Bar GratingALUMINUM RIVETED GRATING 3/4" Inside Face to Inside Face of Bearing Bars
55
Riv-Dexteel® Bridge Deck GratingCompared to other surfaces, Riv-Dexteel® is relatively lightweight and fre-quently permits bridge widening without an appreciable increase in bridgeweight. It often allows resurfacing to handle heavier loads without expen-sive substructure work.
It is ideal where flooding, snow build up or icing is a potential problemsince its openness permits passage of snow and water that a solid sur-face does not allow.
In addition to its common applications as bridge decking and curbinlet grates, it has wide applications in industrial flooring areas, plantloading areas, driveways across culverts and other heavy traffic areas.
Riv-Dexteel® is available in an RL and RH design. RL Riv-Dexteel®
has bearing bars spaced 2-1/2" to 2-11/16", depending on the bar thick-ness, and 3/16" x 1-1/2" reticulated bars. RL is available in both plain andserrated surfaces.
RH Riv-Dexteel® has bearing bars spaced 5-1/8" to 5-1/4" with 3/16"x 1-1/2" reticulated bars and 1/4" x 1-1/2" intermediate bars. In addition,RH has 1/2" by 3/4" tie bars for additional lateral stability. RH is alsoavailable with both plain and serrated surfaces.
Upon request, other bearing bar depths and thicknesses are available.
Total Weight for H or weight onfirst two axles for HS (lbs) 20,000 20,000 40,000 40,000Rear Axle Load (lbs)(80% of total load) 16,000 16,000 32,000 32,000Rear Wheel Load (lbs)(50% of rear axle load) 8,000 8,000 16,000 16,000Impact Factor (maximum) 30% 30% 30% 30%Rear Wheel Load with Impact (lbs) 10,400 10,400 20,800 20,800
BASIS FOR DESIGNLoadings per AASHTO H 10 HS10 H 20 HS 20
Load Distribution per AASHTO H 10 HS10 H 20 HS 20
Fiber Stress (psi)
1) Riv-Dexteel is designed in accordance with AASHTO Standard Specificationsfor Highway Bridges.
2) A = center to center distance between bearing bars3) AMICO-Klemp recommends bearing bars to be placed parallel to traffic. If the
engineer specifies placement perpendicular to traffic, measures should betaken to minimize the effects of out-of-place bending of bars due to vehicleacceleration and braking.
4) The engineer must specify hold down anchors at ends and supports as nec-essary.
5) Consult AMICO-Klemp for all Rolling Load Design.
Normal to Bearing Bars(1-1/4" per ton of axle loadplus twice the bearing barspacings) (inches) 10" + 2A 10" + 2A 20" + 2A 20" + 2AParallel to Bearing Bars(inches) 10" 10" 20" 20"
20,000
RL PLAIN SURFACE RL SERRATED SURFACE
RH PLAIN SURFACE RH SERRATED SURFACE
STEEL RIVETED GRATING
56 56
Riv-Dexteel® Bridge Deck Grating
RL-103 2 1/2" x 3/16" 1 1/2" x 3/16" 15.3 0.1953 0.938 2 1/2RL-104 2 1/2" x 1/4" 1 1/2" x 3/16" 17.4 0.2604 1.220 2 9/16RL-105 2 1/2" x 5/16" 1 1/2" x 3/16" 19.5 0.3255 1.488 2 5/8RL-106 2 1/2" x 3/8" 1 1/2" x 3/16" 21.4 0.3906 1.744 2 11/16RL-113 2 3/4" x 3/16" 1 1/2" x 3/16" 16.1 0.2363 1.134 2 1/2RL-114 2 3/4" x 1/4" 1 1/2" x 3/16" 18.4 0.3151 1.476 2 9/16RL-115 2 3/4" x 5/16" 1 1/2" x 3/16" 20.7 0.3939 1.801 2 5/8RL-116 2 3/4" x 3/8" 1 1/2" x 3/16" 22.8 0.4727 2.110 2 11/16RL-123 3" x 3/16" 1 1/2" x 3/16" 16.8 0.2813 1.350 2 1/2RL-124 3" x 1/4" 1 1/2" x 3/16" 19.4 0.3750 1.756 2 9/16RL-125 3" x 5/16" 1 1/2" x 3/16" 21.9 0.4688 2.143 2 5/8RL-126 3" x 3/8" 1 1/2" x 3/16" 24.3 0.5625 2.512 2 11/16RL-134 3 1/4" x 1/4" 1 1/2" x 3/16" 20.4 0.4401 2.061 2 9/16RL-135 3 1/4" x 5/16" 1 1/2" x 3/16" 23.1 0.5501 2.515 2 5/8RL-136 3 1/4" x 3/8" 1 1/2" x 3/16" 25.7 0.6602 2.948 2 11/16RL-144 3 1/2" x 1/4" 2" x 3/16" 23.6 0.5104 2.390 2 9/16RL-145 3 1/2" x 5/16" 2" x 3/16" 26.5 0.6380 2.917 2 5/8RL-146 3 1/2" x 3/8" 2" x 3/16" 29.2 0.7656 3.419 2 11/16RL-154 3 3/4" x 1/4" 2" x 3/16" 24.6 0.5859 2.744 2 9/16RL-155 3 3/4" x 5/16" 2" x 3/16" 27.7 0.7324 3.348 2 5/8RL-156 3 3/4" x 3/8" 2" x 3/16" 30.6 0.8789 3.924 2 11/16RL-164 4" x 1/4" 2" x 3/16" 25.6 0.6667 3.122 2 9/16RL-165 4" x 5/16" 2" x 3/16" 28.9 0.8333 3.810 2 5/8RL-166 4" x 3/8" 2" x 3/16" 32.0 1.0000 4.465 2 11/16RL-184 4 1/2" x 1/4" 2" x 3/16" 27.6 0.8438 3.951 2 9/16RL-185 4 1/2" x 5/16" 2" x 3/16" 31.3 1.0547 4.821 2 5/8RL-186 4 1/2" x 3/8" 2" x 3/16" 34.9 1.2656 5.651 2 11/16RL-204 5" x 1/4" 2" x 3/16" 29.6 1.0417 4.878 2 9/16RL-205 5" x 5/16" 2" x 3/16" 33.7 1.3021 5.952 2 5/8RL-206 5" x 3/8" 2" x 3/16" 37.7 1.5625 6.977 2 11/16
RH-144 3 1/2" x 1/4" 1 1/2" x 3/16" 18.3 0.5104 1.195 5 1/8RH-145 3 1/2" x 5/16" 1 1/2" x 3/16" 19.8 0.6380 1.476 5 3/16RH-146 3 1/2" x 3/8" 1 1/2" x 3/16" 21.3 0.7656 1.750 5 1/4RH-154 3 3/4" x 1/4" 1 1/2" x 3/16" 18.8 0.5859 1.372 5 1/8RH-155 3 3/4" x 5/16" 1 1/2" x 3/16" 20.4 0.7324 1.694 5 3/16RH-156 3 3/4" x 3/8" 1 1/2" x 3/16" 22.0 0.8789 2.009 5 1/4RH-164 4" x 1/4" 1 1/2" x 3/16" 19.3 0.6667 1.561 5 1/8RH-165 4" x 5/16" 1 1/2" x 3/16" 21.0 0.8333 1.928 5 3/16RH-166 4" x 3/8" 1 1/2" x 3/16" 22.7 1.0000 2.286 5 1/4RH-184 4 1/2" x 1/4" 1 1/2" x 3/16" 20.3 0.8438 1.976 5 1/8RH-185 4 1/2" x 5/16" 1 1/2" x 3/16" 22.2 1.0547 2.440 5 3/16RH-186 4 1/2" x 3/8" 1 1/2" x 3/16" 24.2 1.2656 2.893 5 1/4RH-204 5" x 1/4" 1 1/2" x 3/16" 21.3 1.0417 2.439 5 1/8RH-205 5" x 5/16" 1 1/2" x 3/16" 23.5 1.3021 3.012 5 3/16RH-206 5" x 3/8" 1 1/2" x 3/16" 25.6 1.5625 3.571 5 1/4
Note: Dimension includes 1/4" (1/8" each side) for rivet heads.Rivet heads vary with bearing bar thickness.
Type Weight per unit of per ft. of SpacingRL Bearing Bar Size Reticuline Bar Size (psf) grating width grating width (inches)
“A”Section Modulus (in3) Bearing Bar
Bar Spacing
“A”Bar
ThicknessRiv-
Dexteel
TypeRH
RH
Note: AMICO-Klemp® recommends bearing bars to be placed parallel to traffic.Serrated Bars: Normally we serrate the reticuline bar and raise it slightly abovethe top surface of the bearing bars. We can also serrate the bearing bars. Whenbearing bars are serrated, the depth of grating required for a specified load is1/4" deeper than that shown in the table.Design note: Consult AMICO-Klemp for all Rolling Load Design.
575757
Stair Treads
Tread Length and Width Tolerance
Typical Tread Dimensions
Typical Stair Tread Stringer Detail
Welded (W)Checkered Plate Nosing (CP)
Welded (W)Dimple Plate Nosing (DP)
Welded (W)Cast Aluminum (CAA) Abrasive Nosing
Manufactured to match the full line of our grating, there is an AMICO-Klemp® stair tread to meet your needs. AMICO-Klemp® stair treads aresafe, self-cleaning, skid-resistant and economical. Steel and aluminumstair treads are available in a variety of styles: welded, riveted, press-locked, swage-locked and Duo-Grip™ extruded aluminum.
Welded steel stair treads are the most widely used for their strengthand ease of installation and are universally used in most industrial andcommercial applications. Riveted steel stair treads have a greater loadcarrying capacity for the same span and depth of bearing bar and greaterwalking comfort. Both can be ordered with a serrated surface for addi-tional safety.
Aluminum stair treads, due to their light weight, high strength, corro-sion resistance, rust proof and non-sparking properties, are ideally suitedfor corrosive environments, food preparation and storage areas, andvolatile areas. Swage-locked I-bar stair treads offer you high strength at
less weight and lower cost. Rectangular bar, press-locked or swage-locked, stair treads provide a higher strength and stiffness-to-weightratio and are available with a serrated surface when additional safety isrequired. Our Duo-Grip™ plank stair treads give you an exceptionalstrength and stiffness-to-weight ratio.
All stair treads are custom fabricated to meet the size, width andlength specifications of a particular job. In addition, standard end platescan be custom fabricated to meet special bolt hole size or locationrequirements.
Both steel and aluminum nosings are available to add strength at thepoint of greatest impact and provide a definitive visible edge for extrasafety. Choose our checkered plate nosing for normal use. For additionalsafety, choose our cast aluminum abrasive nosings or our corrugatedaluminum nosings, or dimple nosing available in carbon stainless or aluminum.
STEEL/WELDED & PRESS-LOCKEDSTAIR TREAD TOLERANCES AND DETAILS
3/4" x 3/16" 2'-4" 1'-11" 2'-8" 2'-2"1" x 1/8" 2'-7" 2'-3" 3'-0" 2'-6"1" x 3/16" 3'-5" 2'-10" 4'-0" 3'-4"1-1/4" x 1/8" 3'-7" 3'-1" 4'-2" 3'-7"1-1/4" x 3/16" 4'-8" 4'-2" 5'-1" 4'-6"1-1/2" x 3/16" 5'-6" 5'-3" 5'-6" 5'-6"
When tread length exceeds 5'-6", design tread for 300 lb concentrated loads at 1/3 points.Maximum tread length based on 300 lb concentrated load on front 5 in of tread at center oftread length and deflection limitation of 1/240 of length.
3/4" x 3/16" 2'-0" 1'-5" 2'-8" 1'-9"1" x 1/8" 2'-7" 1'-11" 3'-0" 2'-1"1" x 3/16" 2'-10" 2'-0" 4'-0" 2'-8"1-1/4" x 1/8" 3'-7" 2'-7" 4'-2" 3'-0"1-1/4" x 3/16" 3'-10" 2'-10" 5'-1" 4'-0"1-1/2" x 3/16" 5'-2" 3'-10" 5'-6" 5'-1"
When tread length exceeds 5'-6", design tread for 300 lb concentrated loads at 1/3 points.Maximum tread length based on 300 lb concentrated load on front 5 in of tread at center oftread length and deflection limitation of 1/240 of length. Maximum lengths for serrated applyonly if bearing bars are serrated.
1" x 3/16" 2'-4" 2'-2" 2'-6" 2'-3"1-1/4" x 3/16" 2'-10" 2'-7" 3'-1" 2'-9"1-1/2" x 3/16" 3'-6" 3'-2" 3'-10" 3'-5"1-3/4" x 3/16" 4'-3" 3'-10" 4'-8" 4'-3"
When tread length exceeds 5'-6", design tread for 300 lb concentrated loads at 1/3 points.Maximum tread length based on 300 lb concentrated load on front 5 in of tread at center oftread length and deflection limitation of 1/240 of length.
ALUMINUM/RECTANGULAR BAR SWAGE-LOCKED & PRESS-LOCKED
*
**See drawing above.**See drawing above.
NOTE: Weights are for Swage-Locked only. Call for Weights onPressed-Locked.
7/16” typ.7/16” x 7/8” slot typ.
6161
MAXIMUM TREAD LENGTHSBearing Bar Spacing
Bearing Bar Size 1-3/16" (19 space) 15/16" (15 space)1" x 1/4" 2'-4" 2'-6"1-1/4" x 1/4" 2'-10" 3'-1"1-1/2" x 1/4" 3'-6" 3'-10"1-3/4" x 1/4" 4'-3" 4'-8"
When tread length exceeds 5'-6", design tread for 300 lb concentrated loads at 1/3 points.Maximum tread length based on 300 lb concentrated load on front 5 in of tread at center oftread length and deflection limitation of 1/240 of length.
1" x 1/8" 2'-0" 1'-6" 2'-3" 1'-8"1" x 3/16" 2'-2" 1'-7" 2'-6" 2'-1"1-1/4" x 1/8" 2'-6" 2'-0" 2'-8" 2'-3"1-1/4" x 3/16" 2'-7" 2'-2" 3'-1" 2'-6"1-1/2" x 3/16" 3'-2" 2'-7" 3'-10" 3'-1"
When tread length exceeds 5'-6", design tread for 300 lb concentrated loads at 1/3 points.Maximum tread length based on 300 lb concentrated load on front 5 in of tread at center oftread length and deflection limitation of 1/240 of length. Maximum lengths for serrated applyonly if bearing bars are serrated.
TREAD APPLICATIONSTread Widths Maximum Tread Length A B Wt. Unpunched
3" x 1-3/4" 4'-3"4" x 1-3/4" 5'-0"6" x 1-3/4" 5'-5"9" x 1-3/4" 5'-6"
Maximum tread length based on 300 lb concentrated load on entire tread at center of tread length and deflection limitationof 1/240 of length.
END PLATE DIMENSIONS
3"4"6"9"
Section VIew Symbol SizeWeight(extrusion
only)
Section PropertiesSection
Modulus (in3)Moment ofInertia (in4)
ALUMINUM/DUO-GRIP™
64 6464
Anchoring Details
Type H-3 Saddle ClipThe saddle clip bridges two bearing bars and isattached with 1/4" self-tapping bolt, 1/4" selfthreader, 1/4" weld stud or 1/4" bolt and nutwhen hole is drilled through supporting flange.Available for 15/16", 1-3/16" and 1-3/8" bearingbar spacings (15, 19 and 22 space) in carbonand stainless steel. Fasteners should be specified separate from clips.(Bolts not included)
Type H-1 Anchor ClipA flat head J-bolt secures a preformed plate to theunderside of steel bearing bars and structuralsupporting flange. No drilling needed. Access tothe underside of grating is required for installation.Available in carbon steel. J-bolt is 1/4" x 2-1/2"for grating up to 2-1/4" deep and 1/4" x 3-1/2" for2-1/2" to 3-1/2" deep grating.
WeldsRecommended for all perma-nently installed grating panels.Welds should be 3/16" filletwelds, 3/4" long located approxi-mately 6" from each side of panel(4 locations) and one weld inmiddle of panel at each interme-diate support.
Weld LugsWeld lugs may be used for instal-lations where grating is subject toremoval. Weld lugs are shop fab-ricated and must be specified attime of grating order. Fastenersare 1/4" minimum and suppliedby others. Location is the same as“Attachment Locations” diagram.
Attachment LocationsAttachments should be placed at intermediate supports in the middle of thepanels and at the four bearing bar ends, 6" from each side of panel. Weldsshould be 3/16" fillet welds, 3/4" long. Heavy-Duty grating may require addi-tional welding to meet application needs.
6565
Installation Clearances
*Cross rods may extend 1/8" from bearing bars.
All rectangular cutouts are made to the next bearingbar beyond the penetration with a clearance not toexceed bearing bar spacing.
All panel width dimensions(including cutout) are givento the nearest bearing bar.
I-Beam and Angle Curb I-Beam and Kickplate I-Beam and Handrail I-Beam
Channel Toed Out Channel Toed In Angle in Concrete Concrete
*1/4" is recommended but dimension may vary due to bearing bar spacing.Dimension should not exceed bearing bar spacing.
PANEL TO PANEL CLEARANCES AND CUTOUT CLEARANCES
SUPPORT CLEARANCES
1” Minimum Bearing Surface
66 66
Welding Standards
Attachment to Length of Bearing BarToeplate to be welded with alternating 1/8" fillet welds, 1" long every 12".
Standard Trim BandEnd band to be welded with 1/8" fillet welds (3/16" for heavy duty), 3/4"long every 5".
Load Banding (must specify)Load carrying end band to be welded with fillet weld the size of bearing barthickness (t) and the length of bearing bar depth (d) at each bearing bar. This spec is for standard grating. Refer to NAAMM MBG 532 for heavyduty specification.
Attachment to End of Bearing BarLoad carring toeplates to be welded at each bearing bar with a fillet weldthe size of the bearing bar thickness (t), 3/4" long. Non-load carrying toe-plates to be welded to bearing bars with 1/8" fillet weld (3/16" for heavy-duty), 3/4" long every 5".
Maximum depth of toeplate is (a+d). It should not extend below the bear-ing bars. The minimum recommended dimension for “a”, the projectionof toe plate above the grating, is 4".
TOEPLATES
BANDING
676767
Manufacturing Tolerances
Cross Rod Spacing and AlignmentCross rods should not vary more than 1/8 in 12 in either direction fromperpendicular alignment with bearing bars. The tolerance of the cross barspacing for 5' in length is ±1/4". Bearing Bar Lean
Bearing bar lean must not exceed a slope of 1-1/4 to 12.
Cross Bar LeanCross bar lean must not exceed a slope of 2-1/2 to 12.
Cross Rod PositionThe top of the cross rod should not project more than 1/16" above the topof the bearing bars for standard grating (1/8" for heavy-duty) and shouldnot extend more than 1/8" from side of bearing bars.
Overall Dimensions and SquarenessD = Overall diagonal dimensionW = Length of cross rods including extensions outside of bearing barsL = Length of bearing bars
Longitudinal BowLongitudinal bow should be less than 1/200 of the length for standard grating (1/240 for heavy duty).
Tranverse BowBefore banding, the tranverse bow should be less than 1/8" per foot ofwidth.
PANEL TOLERANCES
BEARING BAR AND CROSS ROD TOLERANCES
68 6868
Glossary
Anchor !! A device by which grating is attached to its supports.
Band !! A flat bar welded to a side or end of a grating panel, or along theline of a cutout, and extending neither above or below the bearing bars.
Load-carrying Band—A band used in a cutout to transfer the loadfrom unsupported bearing bars in the cutout to the supported bearingbars.
Trim Band—A band which carries no load, but is used chiefly toimprove appearance and to protect open ends of bearing bars.
Bearing Bars !! Load-carrying bars extending in the direction of the grat-ing span.
Bearing Bar Centers (spacing) !! The distance center to center of thebearing bars.
Carriers (Punched Plate) !! Flats or angles which are welded to the grat-ing panel and nosing of a stair tread and are attached to a stair stringer tosupport the tread.
Clear Opening !! The distance between faces of bearing bars in a rectan-gular grating, or between a bent connecting bar and a bearing bar in a riv-eted grating.
Cross Rods or Cross Bars !! The connecting rods or bars which extendperpendicular across bearing bars. Where they intersect the bearing bars,they are welded, forged or mechanically locked to them.
Cross Rod or Cross Bar Centers (spacing) !! The distance center to cen-ter of the cross rods or bars.
Curved Cut !! A cutout following a curved pattern.
Cutout !! An area of grating removed to clear an obstruction or to permitpipes, ducts, columns, etc. to pass through the grating.
End Gauge !! The distance from the centerline of the last cross rod to theend of the panel.
Finish !! The coating, usually paint or galvanizing, which is applied to thegrating.
Grating !! An open grid assembly of metal bars in which the bearing bars,running in one direction, are spaced by rigid cross bars attached to them.
I-Bar !! An extruded aluminum bearing bar having a cross sectional shaperesembling the letter “I”.
Length !! The dimension of a grating panel measured parallel to the bear-ing bars.
Nosing !! A special L-section member serving as the front or leading edgeof a stair tread, or of grating at the head of a stair. Usually manufacturedof checkered plate, cast iron or aluminum abrasive material.
Plain Bars !! Non-serrated
Press-Locked !! A method for manufacturing grating where the bearingbars are locked in position by a specialized press fit with cross bar defor-mation instead of riveting or welding.
Radially Cut Grating !! Rectangular grating which is cut into panelsshaped as annular segments, for use in circular or annular areas.
Reticuline Bar !! A sinuously bent connecting bar extending between twoadjacent bearing bars, alternately contacting and being riveted to each.
Reversible Grating !! Grating so constructed that it may be installedeither side up, with no difference in appearance or carrying capacity.
Rivet Centers !! The distance center to center of rivets along one bearingbar.
Riveted Grating !! Grating composed of straight bearing bars and bentconnecting bars which are joined at their contact points by riveting.
Serrated Grating !! Grating which has the top surfaces of the bearingbars notched for slip resistance.
Span of Grating !! The distance between points of grating support, or thedirection of this dimension. It must always be measured parallel to thebearing bars.
Straight Cut !! That portion of the cut edge or cutout of grating which fol-lows a straight line.
Swage-Locked !! Grating manufactured by altering the cross sectionalshape of a metal cross bar by applying pressure through dies.
Toeplate !! A flat bar attached flat against the outer edge of a grating panelor rear edge of tread, and projecting above the top surface of grating ortread to form a lip or curb.
Tread !! A panel of grating having carrier end plates and nosing attachedby welding, and designed specifically to serve as a stair tread.
Welded Grating !! Grating in which the bearing bars and cross bars arejoined at their intersections by resistance welding or conventional handwelding. A resistance weld is obtained by the heat produced by the resis-tance of the material to the flow of electric current causing the material tobecome plastic. At this point, the pressure on the cross bar is rapidlyincreased causing the cross bar to penetrate the bearing bar so that theyare fused together.
Width !! The overall dimension of a grating panel, measured perpendicularto the bearing bars.
696969
Grating Design Data
b = thickness of rectangular bearing bar, inchesd = depth of bearing bar, inchesAw = center to center distance between bearing bars in welded and
press-locked gratings, inchesC = concentrated load at midspan = 4FSw/L pounds per foot of width
(pfw)Dc = deflection under concentrated load = CL3/48 EIw inchesDu = deflection under uniform load = 5UL4/12(384)EIw inchesE = modulus of elasticity, pounds per square inch (psi)
Steel: E = 29,000,000 psi = 29 (10)6
Stainless Steel: E = 28,000,000 psi = 28 (10)6
Aluminum: E = 10,000,000 psi = (10)7
F = allowable fiber unit stress, psiASTM A-1011: F = 18,000 psi (Steel, Carbon Hot Rolled Sheet and
Strip, Commercial Quality AISI 1020)ASTM A-36: F = 20,000 psi (Structural Steel (Bars only))ASTM A167: F = 20,000 psi (Type 304 and 316, Stainless Steel)
F = 16,500 psi (Type 304L and 316L, StainlessSteel)
Ib = moment of inertia of a rectangular bar = bd3/12 in4
Iw = moment of inertia of grating per foot of width = KI in4
K = number of bearing bars per foot of grating width = 12/Aw
L = span of grating between reaction points, inchesMb = maximum bending moment of bearing bar, in-lbsMw = maximum bending moment of grating per foot of width, in-lbsMu = maximum bending moment under uniform load = FSw = UL2/96
in-lbsMc = maximum bending moment under concentrated load = FSw =
CL/4 in-lbsSb = section modulus of a rectangular bar = bd2/6 in.3
Sw = section modulus per foot of grating width = KSb in.3
U = uniform load = 96fSw/L2 psf = 96M/L2 pounds per square foot (psf)
Type of Grating = 19-W-4-63 welded carbon steel gratingSize of Bar = 1-1/2 x 3/16Span = 54 inchesAw = bearing bar spacing = 1.1875 inchesK = number of bearing bars in panel width = 12/Aw = 12/1.1875 =
10.105F = allowable fiber stress = 18,000 psiE = 29,000,000 psiSw = section modulus of grating per foot of width = Kbd2/6 = 10.105 x
0.1875 (1.5)2/6 = 0.711 in.3
Iw = moment of inertia of grating per foot of width = Kbd3/12 = 10.105x 0.1875 (1.5)3/12 = 0.533 in.3
Mw = maximum bending moment for grating per foot of width = FSw =18,000 x 0.711 = 12,800 in.-lbs.
Allowable Concentrated Load and Deflection for 19-W-4-63:C = allowable load = 4Mw/L = 4 x 12,800/54 = 948 pfwDc = deflection = CL3/48EIw = 948 x 543/(48 x 29 x 106 x 0.533) =
0.201 inches
Allowable Uniform Load and Deflection for 19-W-4-63:U = allowable load = 96Mw/L2 = 96 x 12,800/542 = 421 psfDu = deflection = 5UL4/4608EIw = 5 x 421 x 544/(4608 x 29 x 106 x
0.533) = 0.251 inches
SAMPLE CALCULATION: STEEL
DESIGN NOMENCLATURE
70 7070
For a span of 5'-0", the minimum size bearing bar to sustain 225 psf loadis:
Type of Grating = 19-SI-4-64 aluminum swage-locked gratingSize of I-Bar = 1-1/2 x 1/4Equivalent Rectangular Bar for calculation purposes = 1-1/2 x 3/16 (see
note 3)Span = 60 inchesAw = bearing bar spacing = 1.1875 inchesK= number of bearing bars in panel width = 12/Aw = 12/1.1875 =
10.105F= allowable fiber stress = 12,000 psiE= 10,000,000 psiSw = section modulus of grating per foot of width = Kbd2/6 = 10.105 x
0.1875 (1.5)2/6 = 0.711 in3
Iw = moment of inertia of grating per foot of width = Kbd3/12 = 10.105x 0.1875 (1.5)3/12 = 0.533 in3
Mw = maximum bending moment for grating per foot of width = FSw =12,000 x 0.711 = 8,532 in-lbs
Allowable Uniform Load and Deflection for 19-SI-4-64:U = allowable load = 96Mw/L2 = 96 x Mw/602 = 96 x 12,000 x
0.711/602 = 227.5 psfDu = deflection = 5UL4/4608EIg = 5 x 227.5 x 604/(4608 x 10 x 106 x
0.533) = 0.6 inchesDeflection is directly proportional to load (actual load/allowable load):Dactual = Du x Uactual/Uallowable = 0.6 x 225/227.5 = 0.5934 inchesDactual = 0.5934 inches > recommended limitation of deflection =
L/240=.25 inches
Try a grating with a larger moment of inertia to reduce deflection:19-SI-4-64 (1-1/2 x 3/16 equivalent rectangular bar):If Du = .25 inches, then Iw required = 5UL4/4608EDu = 5 x 225 x
604/(4608 x 10 x 106 x .25) = 1.2656 in4
Using a larger size: 19-SI-4-94 (Rectangular bar equivalent = 2-1/4 x3/16)
Iw = K x Ib = 10.105 x 0.1780 = 1.799 in4
Allowable Uniform Load and Deflection for 19-SI-4-94:U = allowable load = 512 lbsD = deflection = 5UL4/4608EIg = 5 x 512 x 604/(4608 x 10 x 106 x
1.799) = 0.40 inchesDeflection is directly proportional to load (actual load/allowable load):Du = Du x Uactual/Uallowable = 0.40 (225)/512 = 0.176 inches OK
deflection < L/240 (.25 inches)
1" x 1/4" 1" x 3/16" .120 .144 .0156 .03131-1/4" x 1/4" 1-1/4" x 3/16" .150 .180 .0305 .04881-1/2" x 1/4" 1-1/2" x 3/16" .180 .216 .0507 .07031-3/4" x 1/4" 1-3/4" x 3/16" .210 .252 .0837 .09572" x 1/4" 2" x 3/16" .240 .288 .1250 .12502-1/4" x 1/4" 2-1/4" x 3/16" .270 .324 .1780 .15822-1/2" x 1/2" 2-1/2" x 3/16" .300 .360 .2441 .1953
This table is to be used by engineers to select aluminum I-bar sizes throughhand calculations. In most cases, the Load and Span tables in the front ofthis catalog can be used for product selection.
Notes:1) For additional information, see NAAMM’s MBG-534, Engineering
Design Manual2) Uniform loads in these examples and in the standard load tables
include the weight of the gratings. In designing for uniform loads, theweight of the grating, as well as any other dead load, must be added.
3) Aluminum I-Bar Grating Design Information
ComparableRectangular Weight
I-Bar Size Bar Size Area (in2) (plf) I (in4) S (in3)
SAMPLE CALCULATION: ALUMINUM
For partially distributed uniform loads, forklift and other wheeled loads (carts, pallet jacks, etc.), and other load calculations, contact AMICO-Klemp®’s engineering departments for assistance.