www.metsec.com CI/SfB April 2010 (28) Hh2 Lattice beam technical manual Lightweight joists, trusses and New composite floor beams
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
www.metsec.com
CI/SfBApril 2010
(28) Hh2
Lattice beam technical manualLightweight joists, trusses and
New composite floor beams
3
Product range 6-9
Roof beams 10-17
Floor beams 20-23
Ceiling and service supports 18-19
Metsec: Investing in quality and service 4-5
Features and benefits 6-7Product range 8-9
Metal roof systems 10-11Traditional roof systems 12Green roof systems 13Complete lightweight systems 14Over-roof systems 15Eaves cantilever systems 16-17
Traditional floor systems 20Mezzanine floor systems 21Composite floor Systems 22-23
Fixing details 24-27
Typical fixing details 24-27
Chord and bridging details 28-29
Chord details 28Bridging details 29
Ceiling and service support systems 18Walk on ceiling systems 19
Design examples and load tables 30-37
Design examples 30-33Load tables - Parallel beams 34-36Load tables - Composite floor beams 37
Services and design software 38-39
Contents
Services and general notes 38Software 39
4
Investing in quality and service
The CompanyMetsec plc is the UK’s largest specialist cold roll-forming company, providing structural steelcomponents for the UK construction andmanufacturing industries. We have beenestablished for over 75 years and are based inOldbury in the West Midlands.
Today, Metsec are part of the Profilform Divisionof voestalpine - the world’s largest manufacturerof cold roll-formed sections, with a global networkproducing over 800,000 tonnes of cold rolled steelper annum.
We focus on adding value through expert design,precision manufacturing and on-time, in-fullproduct delivery. Our aim is to provide excellentservice and quality products that offer ourcustomers cost effective solutions.
Metsec Lattice Beam DivisionLightweight steel lattice beams were firstintroduced by Metsec in the 1950’s and theirinherent advantages very quickly established theproduct as the first choice for structurally sound,cost effective construction.
Since this introduction, the Metsec policy ofcontinual research and development has ensuredthat quality and technical properties haveimproved over the years and availability of typehas increased in parallel with development inbuilding technology and architectural styles.
The Metsec Lattice Beam Division offers a widerange of joist and truss solutions pre-engineeredoff site. We can achieve spans of up to 40m and allof our designs give optimal levels of structuralperformance in roof, floor or any other applicationwhere light weight and long span performance isimportant. All sections are designed in accordancewith BS 5950-5:1998.
QualityMetsec operates strict design and qualityprocedures through a Quality ManagementSystem accredited to BS EN ISO 9001:2000 which covers both our design and manufacturingoperations.
This commitment to quality ensures that weprovide the highest levels of performancethroughout our operations, ensuring the highestlevel of customer satisfaction.
Quality and service
5
Quality and service
SustainabilityCertification
Metsec and voestalpine both regard the issue ofsustainability as a core social, as well as corporate,responsibility.
This has been recognised by the award of BS EN ISO 14001:2004 for our EnvironmentalManagement System.
Metsec were the first cold roll-forming companyto be awarded the prestigious gold standard underthe Steel Construction Sustainability Charter.
Additionally, Metsec recognise that environmentalresponsibility is both a local as well as a globalissue. We were therefore pleased to be awardedthe Sandwell Borough Platinum EnvironmentalCharter Award following an audit of ourEnvironmental management procedures andaward of BS EN ISO 14001:2004.
Design
Our market-leading LatticeSPEC design softwareprovides cost effective solutions to maximise thedesign efficiency of structures. Comprehensivetechnical support is provided by our design office.
The latest version of LatticeSPEC offers theunique advantage of producing completeprofiles/sections of joists and trusses in .dxfformat, saving the professional team valuable timewhen specifying our products.
For full details on our technical support serviceand how to obtain a free copy of LatticeSPECplease refer to page 39.
Re-use and recycling
Steel is one of the World’s most recycled
“ The baseline SPeAR® diagram shows a well balanced performance in terms of
sustainability, and that Metsec is already meeting legislation or best practice in the large majority of areas. In some cases Metsec is starting to move beyond best practice.”
materials. According to the British ConstructionalSteelwork Association (BCSA), recovery rates forsteel components from building demolition sitesare 84% for recycling and 10% for re-use*. This gives a total potential recovery and re-use factor of steel from buildings of anincredible 94%.
* BCSA publication no. 35/03
SPeAR®
Independently, as well as with voestalpine,Metsec will continue to pursue sustainability as akey business objective. The cornerstone of this isthe very thorough and detailed societal, economicand environmental sustainability review of ouroperations carried out in the SPeAR® (SustainableProject Appraisal Routine) Report from Arup. Thisreport gives us both an assessment of our currentenvironmental position as well as identifying keyareas for improvement in the future.
To quote from the report:
6
Product range
Features and benefitsMetsec lattice beams are designed andmanufactured to BS 5950-1: 2000 and 5: 1998 andare formed from two cold rolled chord sectionswith a central web joining the two together.Typical profiles are shown on page 8-9. The chordsections are all formed from high yield steel to BSEN 10149-2: 1996 and have a minimum yieldstrength of 355N/mm².
The web members are usually constructed fromsolid bar on the smaller joists or hollow section forthe deeper joists and trusses. These are joined tothe chord sections by CO2 shielded arc welding ina pre-set jig to ensure dimensional accuracy.
This process allows for the design andmanufacture of a vast range of profiles, fromsimple parallel joists through to complex doublecurve, wave trusses, to suit almost anyapplication.
Services - excellent head heightThe open web configuration of Metsec latticebeams allows for the simple passage of servicesthrough the web lacings. However, the weblacings will not necessarily align unless this isspecifically requested.
Where special duct openings are required theseshould be positioned near the centre of the beamwhere shear is less critical.
Please consult the Metsec Lattice Beam TechnicalDepartment for further information.
Long span - light weightA typical Metsec lattice beam can weigh up to50% less than its hot rolled counterpart and yetstill achieve spans of up to 40m without the needfor intermediate support columns - which canallow designers greater flexibility when workingto optimise internal space.
Internal space can also be optimised by passingservices through the web of the lattice rather thanhaving to suspend them underneath causing asignificant loss of headroom.
7
Product range
Pre-engineered offsite - to ease site accessWhere site access is a consideration, bolted jointscan be used. The joists are then assembled on siteusing H.T. grade 8.8 bolts to join the sections.
Flush site joints to the top and/or bottom chordsare also available.
Factory joints may occasionally be incorporatedinto joists. They will always consist of anappropriate jointing arrangement with a fullprofile fillet weld.
Finish – as flexible as your designAll Metsec lattice beams are supplied shot blastedand factory finished with a Zinc Phosphate primeras standard. Other painted finishes, including anystandard RAL colour, are available upon request.This feature is particularly important if it isdesired to leave the lattice members exposed aspart of a ‘feature’ internal roof structure.
A hot-dipped galvanised finish is also available.This is recommended for cold roofs and roofs withlimited access or exposed locations.
Timber - for rapid, secure fixingsFlush fitting standard ‘Vac-Vac WR’ treated timbercan be supplied if required in the top and/orbottom chords of all beams. The timber is rigidlyattached to the chords by shot-fired pins at600mm staggered centres. This offers a simplefixing medium for certain floor/roof finishes,timber firrings and/or plasterboard ceilings.
Optimised wall/ceiling junctionsDue to the slim profile offered by Metsec latticebeams’ excellent strength to weight ratio, beamscan be incorporated at the head of partitioningand drylining systems without any requirementfor separate boxing in or encasement.
This allows continuous and parallel studwork tofull ceiling height, simplifying and acceleratinginstallation, maximising use of space andoptimising aesthetics.
8
Parallel beamRoofs – suitable for use with flat roofs or sloping roofswhere the lattice beams can be laid to falls. They canalso be used as long span purlins and are suitable for usewith most external finishes from lightweight metalsheeting through to heavier constructions with tiles onbattens or decking.
Floors – suitable for use as joists in all types of flooringincluding timber, pre-cast concrete slabs or profiledmetal decking with in-situ poured concrete.
Product range
Pitched trussPitched trusses are suitable for all types of duo-pitch roofconstruction and can be used with most external finishesfrom lightweight metal sheeting through to heavierconstructions with tiles on battens or decking.
Tapered trussTapered trusses are suitable for all types of mono-pitchroof construction. They can be used with most externalfinishes from lightweight metal sheeting through toheavier constructions with tiles on battens or decking.
Inverted trussInverted trusses are generally used on low pitchedroofing with timber or metal decking and built upfinishes. When used in conjunction with Metsec Z-section purlins the design of deep valley gutters canbe simplified.
Parallel pitched beamParallel pitched beams are suitable for all types of duo-pitch roof construction providing extra headroom overthat afforded by the pitched truss. They can be usedwith most external finishes from lightweight metalsheeting through to heavier constructions with tiles onbattens or decking.
Product range
9
In many of the applications listed above Metsec Z-section purlinsprovide an excellent design solution to carry the external finish.Similarly the wide range of Metsec mezzanine floor C-sections canprovide a range of system solutions for the designer.
Curved trussCurved trusses can provide an aesthetically enhancedroof profile. When used with a standing seam roof thistype of construction is easy to detail and install giving avery low maintenance roof.
Curved beamCurved beams provide an aesthetically enhanced roofprofile construction providing extra headroom over thatafforded by the curved truss. When used with a standingseam roof this type of construction is easy to detail andinstall giving a very low maintenance roof.
Double curved (wave) trussDouble curved trusses provide an ideal solution for thedesigner working with modern multi-curved roofstructures. When used in conjunction with Metsec SFSframing system the structure can be built to a constantdatum and can be used with all typical external finishes
Inverted curved trussInverted curved trusses offer designers a simple solutionwhen specifying a single curve roof structure. This canbe used to enhance the appearance of roof structures andis frequently specified with standing seam roofing tocreate a smooth appearance.
Product range
10
Metsec lattice beams can offer the ideal solutionfor supporting a wide variety of roofing systemsdue to their excellent strength to weight ratio. A typical Metsec lattice beam can weigh up to50% less than its hot rolled counterpart and yetstill achieve spans of up to 40m without the needfor intermediate support columns – which canallow designers greater flexibility when workingto optimise internal space.
Internal space can also be optimised by passingservices through the web of the lattice rather thanhaving to suspend them underneath causing asignificant loss of headroom.
Metal roof systems
Curved truss with structural deckMetsec curved trusses can be used to supportstructural decks with a suspended ceiling. The natural open web of the truss allows for thesimple passage of services.
Roof beams
Leasowes Medical Centre, West Midlands
Similarly their aesthetic properties mean that theycan be supplied painted and left exposed as partof a ‘feature’ internal roof structure.
In addition to the direct reduction of theenvironmental footprint of a construction projectby virtue of their lighter weight, lattice beams canalso help to reduce the environmental footprint ofthe project by using off-site fabrication to speedup the construction process of the roof as thelighter sections can generally be transported andhandled more efficiently on site.
11
Parallel beam laid to fall Metsec parallel beams can be used to support Z-section purlinsbolted to cleats pre-welded to the top chord of the beam. Liner tray,insulation and metal deck provide the weather-proof layer and arefixed to the Z-section purlins.
Pitched truss with flush-fitting Z-section purlinsMetsec pitched trusses are supported on a hot rolled steel structuralframe. Z-section purlins are fitted flush to the top chord of thepitched trusses to support standing seam roof, or similar.
Flush fitting Z-section purlins are often used to minimise the overallconstruction depth of the roof.
Roof beams
Vauxhall Sales Centre, West Midlands
Staplehurst Medical Centre, Kent
12
Roof beams
Parallel beam used as purlinMetsec parallel beams can beused as long span purlinssupported on load bearingmasonry walls. In thisapplication timber firrings arefixed directly to flush fittingtimber inserts in the top chordof the beam. Timber roof raftersare then fixed to the timberfirrings to support counterbattens, underlay, tiling battensand tile or slates.
Pitched truss used to supporttimber purlinsTraditional timber purlins canbe supported on a Metsecpitched truss. Ply or similarsheathing is then used tosupport weatherproofing layersof battens, underlay and rooftiles or slates.
Traditional roof systems
Firringsby others
Timber insert for nailability
13
Roof beams
Parallel beams used to supportsteel decking with green roofsurfacingMetsec parallel beams can be usedto support a structural deck,membrane, substrate and Sedumroof.
These beams can be up to 50%lighter than hot rolled beams anduse far less steel with considerablyless environmental impact thanother systems.
Smithswood School, Solihull
Green roof systems
14
Roof beams
Complete lightweight systems
Patching Lodge, Brighton
Metsec double curve roof systemMetsec lightweight trusses and Z-section purlins canalso be combined with stand alone, light gauge, coldrolled Steel Framing Systems (SFS) to providecomplete one-source building solutions.
Metsec lightweight trusses, combined with SFSstand-alone walling systems, are becoming evermore popular for constructing completestructures.
The Metsec Lattice Beam and Framing Divisionswork together closely to provide total constructionsolutions for the developer.
The complete wall and roof solution is frequentlyinstalled through the Metsec Framing Division’sapproved installer network. This adds to thecomplete, one-source nature of the package inkeeping with the demands of the modernconstruction industry.
15
Roof beams
Over-roof systems
Where existing flat roofs are starting to fail orrequire upgrading, one option to consider is thecreation of a new pitched, or curved, over-roofwhich can be constructed quickly and costeffectively using lattice trusses.
The lightweight lattice over-roofing system avoidsthe need to strengthen the existing roof structureand can give an existing building a much neededfacelift - typically at a fraction of new build costs.
The new trusses can be spaced at much widercentres than other over-roof systems, which resultsin fewer penetrations and fixings into the existingstructure.
The new lattice trusses are installed to span across
St. Lukes School, Portsmouth.
the building and provide a range of benefits forthe building owner, including improved waterrun-off and enhanced building insulation. Theadditional space created under the new structurecan also be used to house building servicesmaking usable space available elsewhere in thestructure.
The Metsec lattice team have gained considerableexpertise in the design of trusses for use in over-roofing projects both large and small.
Building services
Ring beams
16
Roof beams
Cantilever bolted to weldedstub-postThis detail can be used formedium span cantilevers ofup to 2m.
The cantilever arm is boltedto the end post which issupplied welded into the endof the lattice.
Since the cantilever roofelement does not require aninsulation layer the line ofthe supporting cantilevereaves structure iscorrespondingly raised tosupport the top sheet.
Eaves cantilever systems
Top chord cantileverThis detail can be used for smallspan cantilevers of up to 1m.
Stiffener angles can be weldedto the sides of the top chord, ifrequired, to provide aneconomic cantilever solution.
Roof beams
Loose, bolt-on cantileverThis detail can be used for largespan cantilevers ofover 2m.
The cantilever arm extendsinto the building to provide anadequate backing span and isbolted on to the top chord ofthe lattice.
17
Park Central Apartments, Birmingham
18
Ceilings and service supports
Ceilings and service support systems
Service support/pipebridgeMetsec provide an economic system to formpipebridge and service supports.
Lightweight lattice joists are provided in pairs andbraced together to form spans of up to 40m.
The majority of pipebridges are supplied with agalvanised finish for external applications.However, various paint specifications are alsoavailable where required.
Metsec parallel lattice beams are the idealsolution for the support of ceiling structureswithin existing buildings. Whether the ceiling is asimple suspension from a secondary grid of C-sections or is ‘walk-on’ and supported from thebottom chord of the lattice beam, Metsec has arange of solutions.
Lattice beams are ideal for clean rooms, datahalls, telecommunications facilities, retail unitsand secure locations where long, unobstructedspans are essential and where their light weightcan minimise the load on to the existing structure.They can also allow the passage of services
Millennium Dome, LondonMillennium Dome, London
through the lattice’s web without any loss of headroom or need for exposed pipework which can forma potential dust trap.
Metsec lattice primary members together with Z or C-section secondary members provide a costeffective solution to ceiling/service supportrequirements.
Metsec parallel beamUsed with secondary C-sectionsto support a suspended ceiling.In the illustration shown, theability to run split-level ductingthrough the lattice without anyloss of internal headroom isclearly demonstrated. A furtherbenefit is that future changes tothe building services can easilybe accommodated by runningpiping or ducting through thelattice.
Metsec parallel beamsupporting walk-on ceilingMetsec parallel ceiling supportbeams can be used for walk-onceiling applications.
19
Ceilings and service supports
Walk-on ceiling systems
Clean room ceiling support structure
Ceiling and service support structure
Metsec lattice beams are frequently used to createa support structure for walk-on ceilings in whichan interlocking system of steel faced planks isused to create a load bearing ceiling construction.These systems are particularly popular in thecreation of “clean rooms” where sealing the jointsof these planks creates a closed ceiling void inwhich the high level mechanical and electricalservices can be installed without the need forsecondary floors or complex support systems.
These systems provide an excellent solution to thelocation of services and are specifically designedto allow maintenance engineers to walk on top ofthe ceiling system. This facilitates the easy accessto services and components without the need forthe access equipment normally associated withmore basic ceiling installations.
The two photographs to the left show projectswhere Metsec lattice beams are employed in walkon ceiling constructions.
20
Floor beams
Traditional floor systemsMetsec lattice joists offer a simple solution for theconstruction of both conventional and mezzaninefloors due to their excellent strength to weight ratio. This means that a typical lattice joist can weigh up to 50%less than their hot rolled counterparts.
Of great importance to the designer is the fact that theinternal space can be optimised by passing services throughthe web of the lattice joists rather than having to suspendthem underneath causing a significant loss of headroom.
Similarly, the ability to insert flush fitting timber sections intothe top and bottom chords offers a simple medium for thefastening of floor decking and/or plasterboard ceilings.
White Rose Shopping Centre, Leeds.
Traditional floorsMetsec parallel floor joists at600mm centres with the floordecking nailed to the top chordand two layers of plasterboardto the bottom chord.
In addition to the direct reduction of the environmentalfootprint of a construction project by virtue of theirlighter weight, lattice beams can also help to reduce theenvironmental footprint of the project by using off-sitefabrication to speed up the construction process of thefloor as the lighter sections can generally be transportedand handled more efficiently on site.
21
Floor beams
Mezzanine floorsMetsec parallel floor joists with C-sections supporting floor decking.
The photograph below shows aproject where 17m span lattice joistswere designed to carry storageloadings.
Zurich Insurance, Wiltshire
Mezzanine floor systems
22
Floor beams
InnovationLong clear column free spans can be achieved with thelightweight lattice design to offer clients present and futurelayout flexibility.
Factory fitted shear connector plates eliminate the need to studweld on site and guarantees composite action.
Standard open web design allows for the easy passage ofservices with larger bespoke openings available on request.
Single span metal deck with the option of crushed ends formedduring the roll forming process eliminates the need to fit endcaps on site and gives improved composite action.
ProductivityBespoke precision engineered off-site manufacture ofintumescent painted beams available within 4-5 weeks fromorder.
One hour fire ratingMetsec composite beams have been analysed using Vulcansoftware from FEDRA and a full fire test has been carried outat Warringtonfire in accordance with BS476-21:1987 to achievea one hour fire certification. The beams have off-site appliedintumescent fire protection as required.
Quality, performance and predictabilityPurpose designed lattice beams with quality controlled factoryapplied intumescent fire protection eliminating web bucklingissues. Pre welded shear connector plates offer a guaranteedcomposite action which is further improved when using crushedends on single span decking.
Composite floor systems
cross-over services
M&E flexibilityLike all of Metsec’s beams, joists and trusses,the new composite beam is purpose-designed tosuit customer requirements.
Whilst the standard open web configurationprovides unprecedented flexibility for therouting of M&E services, including the ability tocross over services within the depth of the beam,bespoke, over sized, rectangular openings canbe designed to offer even more flexibility,maintaining minimum floor zones to maximisefloor to ceiling heights, or reduce the overallheight of the building.
* BCSA publication 35/03
23
Floor beams
bespoke-designed service routes
Programme savingsLightweight and easy to handle with simple site connectionsthe composite beams can improve the speed of erection overhot rolled alternatives.
Steel floor decking with factory crushed ends speeds up theinstallation of single span decking and unlike stud weldeddecking it is not affected by the weather.
SustainabilityUp to 10% lighter than cellular or castellated alternatives, theMetsec lattice composite beam uses less steel in manufactureand, taking weight out of the structure as a whole, willsignificantly contribute towards reducing the building’soverall carbon footprint. Steel is one of the world’s mostrecycled materials with a potential recovery and re-use factor of up to 94%*.
Cost reductionsBy designing a lighter Metsec composite beam andutilising the improved single spanning capability of modern60mm and 80mm decking profiles with crushed ends, avalue engineered solution can be achieved. Additionalsavings can be gained in other areas from potentialprogramme savings within the M&E package, and theinstalled cost savings achieved through removing on sitestud welding. Main contractors also have the option topackage beams and decking together to improvecoordination and offer single contractual responsibility.
Enhanced Health and SafetyLighter beams with pre-welded shear connector platesguaranteeing the composite action, eliminates the need tostud weld on site, removing all hot works. Lighter and easy tohandle, single span decking with crushed ends eliminate theneed to cut and fix end caps on site. Removal of stud weldingfrom site also avoids the need to site test stud weldperformance, saving time and allowing concrete pours toprogress safely shortly after the deck has been installed.
24
Fixing details
Typical fixing details
F1 – Shoe fixing to concrete padstone
F4 – Full depth seating with beam extended
F5 – Beam fixing to internal wall F6 – Beam laid to fall with full depth seat
F3 – Full depth fixing to concrete padstone
F2 – Beam laid to fallon sloping shoes
25
Fixing details
F7 – Fixing to concrete face with loose angle cleats F8 – Shoe fixing to hot rolled steelwork
F9 – Shoe fixing to hot rolled steelwork (pair) F10 – Full depth fixing to the web of hot rolledsteelwork
F11 – Full depth fixing to hot rolled steelwork F12 – Fixing to internal hot rolled steelwork
26
F13 – Beam to column flange fixing
Fixing details
Typical fixing details
F14 – Beam to column fixing with plate weldedto column
F15 – Beam to beam trimmer fixing F16 – Typical bridging fixing detail
F17 – Bracing fixing detail Note
‘F’ and ‘T’ details illustrate a typical range of connections that are
available. Other connections can be fabricated to suit site conditions .
27
Fixing details
T1 – Full depth fixing with bearing plate T2 – Purlin to truss fixing
T3 – Truss to column flange fixing T4 – Standard shoe fixing to hot rolled steelwork
T5 – Beam to truss trimmer fixingT6 – Standard shoe fixing to concrete padstone
28
Chord and bridging details
Chord details
35
50 2.5
3550
120
yx x
37.5 37.560
450
135
x xy
40 75 40155
575 x x
y
210
6565
5
80
100 x x
y
Nominal dimensions
Chord y Area rxx ryy Ixx Iyy Zxx Zyy
type mm cm2 cm cm cm4 cm4 cm3 cm3
MB 23.27 5.16 1.97 3.14 19.96 50.90 7.47 8.48
MD 24.25 8.53 1.93 3.66 31.84 114.12 12.36 16.91
MG 38.13 13.89 2.84 4.27 112.13 253.58 29.41 32.72
MJ 45.04 19.14 3.85 5.32 283.15 542.17 51.52 51.64
ML 45.51 23.84 3.85 5.94 353.90 840.11 64.94 73.05
MC 45.50 21.14 3.94 6.48 328.76 889.42 60.33 71.15
250
7575
100
100
5
x x
y
230
7070
6
100
90
x x
y
29
BridgingBridging is recommendedduring the construction periodto enable the beams to supportthe construction loads, and tohold the beams at the centresand positions indicated on theplans.
However, when constructionloads are deemed to be light,bridging can be omitted at thediscretion of the Metsec LatticeBeam Technical Department.
Bridging consists of steel anglesconnected to the top chord ofthe lattice. Bridging may also berequired to the bottom chordsdepending on designconsiderations. The slendernessratio l/r of the bridging anglemust not exceed 250.
Chord and bridging details
Bridging details
Wind reversalWhere construction loads arelight the bottom chords shouldbe checked for compression dueto the wind reversal forces.
Please contact Metsec LatticeBeam Technical Department forfurther advice.
Maximum spacing of bridging for chord sections (m)
Type MB MD MG MJ ML MC
3.8 4.4 5.2 6.4 7.5 7.5
Sizes of bridging angle for various joists centres
Centres of joists (m) Standard bridging angle (mm)
0 – 2.4 50 x 50 x 3
2.4 – 3.0 60 x 60 x 5
3.0 – 3.9 80 x 80 x 6
3.9 – 4.9 100 x 100 x 8
Bridging
Knee bracing
30
Design examples and load tables
Design examples
Parallel beam - span/depth ratioAs a guide, depths of roof beam, conform approximately tothe following:
Approximate depth = span/20i.e. 10m span/20 = 500mm deep
Design example
Joist span 10,000mm
Joist spacing 4,500mm
Roof loading:
Decking and insulation 0.20kN/m2
Ceiling and services 0.30kN/m2
Allow S.Wt steelwork 0.10kN/m2
Dead load 0.60kN/m2 x 1.4 = 0.84kN/m2
Imposed load 0.60kN/m2 x 1.6 = 0.96kN/m2
Total load 1.20kN/m2 1.80kN/m2
Total load requirement = 1.80 x 4.5 = 8.10kN/m
Imposed load requirements = 0.6 x 4.5 = 2.70kN/m
Refer to load tables.
Use Metsec lattice beams ref: MD50
Total load capacity 8.83kN/m (>8.10)
Imposed load capacity 3.83kN/m (>2.70)
Important
The lighter the beam, the more cost effective the solution.
DesignationThe designation of beam configurations and depths isgiven by a simple letter and number code, as follows:
Chord Depth at Configuration Pitch
type shallow end or radius
MB – ML (cm) T (tapered) Gradient (o)TR (pitched) Radius (m)
PP (parallel pitched)I (inverted)
CT (curved truss)CB (curved beam)
Example 1MD 50
Thus MD50 comprises MD type chord sections with an overall beamdepth of 500mm without pitch or taper.
Example 2
MJ 60 TRW 100
Thus MJ60TRW(100) comprises MJ type chord sections with anoverall truss depth at the shallow end of 600mm rising to a centralridge with a Warren type web pattern and a 100 slope.
Stone Road, West Midlands
31
Design examples and load tables
Summerhill Primary School, West Midlands
Typical truss optionsN – type trussThis is the most economical type of joist or truss whenconsidering gravity loading only and where stressreversals are insignificant - i.e. longer diagonal membersare in tension.
Warren type trussMay be preferred in having a better appearance than theN – type joist or truss. Diagonals are alternatively strutsand ties.
This results in a frame less susceptible to deflection thanthe N – type.
Typical tapered truss options
Warren type truss with vertical postsAdditional members are introduced to the basic warrentype joist or truss to support loads which do not occur atnode positions.
32
Lattice beam, in steel frameconstruction
Lattice beamThe Metsec lattice beam canprovide a very attractive,lightweight, economicalsolution when used as a mainsupport to the roof structure,being able to meet short,medium or long spanrequirements.
The beam can be provided withfully fixed end connectionsdetermined by simple frameanalysis if required.Alternatively, they can besimply supported to carryvertical applied dead andimposed loads and fixed forhorizontal wind as a commondesign assumption.
PurlinsThe most economic section usedfor supporting the roof claddingis a cold rolled purlin.
Metsec cold rolled Z-sectionpurlins provide adequate lateralrestraint to the top(compression) chord of thelattice beams.
BracingThe longitudinal tensile forcesin the Metsec Z-section purlinsresulting from lateral restraint tothe lattice beams aretransmitted to the diagonalrafter bracing system providedat each end of the building. Inaddition to providing stability tothe lattice beams, bracing alsoresists wind loading at the gableends (i.e. gable posts propped atbracing node points) and acts asstability bracing duringerection.
For longer buildings additionalbracing may be required tointermediate bays.
Vertical bracing as shown on theroof plan ensures that all forcesare transmitted to thefoundations.
Optional bottom tie
Ridge
CL
Knee brace as required
Gable posts
Metsec lattice beam
Metsec lattice beam
Metsec lattice beam
Vert
ical
bra
ceVe
rtic
al b
race
Vert
ical
bra
ceVe
rtic
al b
race
Cleader rail
Met
sec
eave
s be
am
Raf
ter
brac
ing
Metsec Z purlins
Metsec lattice beam
Metsec lattice beam
Metsec lattice beam
Design examples and load tables
33
Lattice truss in load bearing wallconstruction
Lattice trussThe Metsec lattice truss provides alightweight, economic solutionwhen used as the roof lid mainsupport member on load bearingwall construction. The lattice formprovides a more flexible servicezone within the ceiling void.
Large spans of up to 40m are easilyaccommodated.
PurlinsMetsec cold rolled Z-sectionpurlins are used as economicsupport to the roof cladding andprovide adequate lateral restraintto the top (compression) chord ofthe lattice truss.
Rafter bracingThe longitudinal forces in theMetsec Z-section purlins resultingfrom lateral restraint to the latticetruss are transmitted to thediagonal rafter bracing system.
Bottom tie bracingThe wind loading on verticalspanning side walls is resisted by ahorizontal bracing system utilisinga steel or concrete ring beam atbottom chord (eaves) level. Thisring beam may be returned on thegable ends to provide intermediatelateral support to the walls.
The longitudinal ties also serve aslateral restraint members to thebottom chord of lattice truss incompression from wind uplift.
Raf
ter
brac
ing
Hor
izon
tal s
pan
of r
ing
beam
Metsec truss
Metsec truss
Metsec truss
Metsec truss
Eaves bracing
Long
itudi
nal t
ie
Long
itudi
nal t
ie
Ring beam
Load bearing walls
“Suspended” ceilingServices
Metsec Z purlins
Design examples and load tables
Joist Overall Typical node Ixx Self weight
type depth (mm) centres (mm) (cm4) (kg/m)
Span (m)Standard camber (mm)
Span (m)5 6 7 8 9 10 11 12 13 14 15 16 17
35.94 29.95 25.67 22.46 19.97 17.97 16.34 14.97 13.82 12.83 11.98 10.59 8.835 6 7 8 9 10 11 12 13 14 15 16 173 4 6 7 9 12 14 16 19 22 26 29 33
MB22 220 250 816 10 6.58 3.81 2.402.86 1.65 1.04
MB27 270 350 1328 10 6.42 5.35 3.90 2.614.01 2.69 1.69 1.13
MB30 300 380 1697 11 11.32 7.86 4.99 3.34 2.355.94 3.44 2.16 1.45 1.02
MD30 300 380 2762 16 13.33 11.11 8.11 5.44 3.82 2.788.33 5.59 3.52 2.36 1.66 1.21
MB35 350 600 2416 12 13.56 9.42 6.92 4.75 3.34 2.438.45 4.89 3.08 2.06 1.45 1.06
MD35 350 600 3941 17 17.08 14.24 11.58 7.76 5.45 3.97 2.9810.68 7.98 5.03 3.37 2.36 1.72 1.29
MG35 350 600 5429 28 37.01 25.33 15.95 10.68 7.50 5.47 4.11 3.17 2.4918.99 10.99 6.92 4.64 3.26 2.37 1.78 1.37 1.08
MB40 400 600 3263 12 15.79 10.97 8.06 6.17 4.51 3.29 2.479.87 6.61 4.16 2.79 1.96 1.43 1.07
MD40 400 600 5334 17 17.17 14.31 12.27 10.50 7.37 5.37 4.04 3.1110.73 8.95 6.80 4.56 3.20 2.33 1.75 1.35
MG40 400 600 7504 28 40.28 30.87 22.04 14.77 10.37 7.56 5.68 4.38 3.44 2.7625.17 15.19 9.57 6.41 4.50 3.28 2.47 1.90 1.49 1.20
MB45 450 600 4240 13 18.03 12.52 9.20 7.04 5.56 4.27 3.2111.27 7.82 5.41 3.62 2.54 1.85 1.39
MD45 450 600 6940 20 22.15 18.46 15.82 12.42 9.59 6.99 5.25 4.05 3.18 2.5513.85 11.54 8.85 5.93 4.16 3.04 2.28 1.76 1.38 1.11
MG45 450 600 9926 29 42.82 35.63 26.18 19.53 13.72 10.00 7.51 5.79 4.55 3.64 2.96 2.4426.76 20.10 12.66 8.48 5.95 4.34 3.26 2.51 1.98 1.58 1.29 1.06
MJ45 450 600 12965 37 42.18 35.15 30.13 25.52 17.92 13.06 9.81 7.56 5.95 4.76 3.87 3.19 2.6626.36 21.97 16.53 11.07 7.78 5.67 4.26 3.28 2.58 2.07 1.68 1.38 1.15
MB50 500 600 5345 14 20.26 14.07 10.34 7.91 6.25 5.06 4.05 3.12 2.4512.66 8.79 6.46 4.57 3.21 2.34 1.76 1.35 1.06
MD50 500 600 8759 19 21.45 17.88 15.32 13.41 11.04 8.83 6.63 5.11 4.02 3.22 2.6213.41 11.17 9.58 7.48 5.25 3.83 2.88 2.22 1.74 1.40 1.13
MG50 500 600 12696 29 44.82 37.35 29.68 22.72 17.55 12.79 9.61 7.40 5.82 4.66 3.79 3.12 2.6028.01 23.34 16.19 10.84 7.62 5.55 4.17 3.21 2.53 2.02 1.65 1.36 1.13
MJ50 500 600 16649 37 44.31 36.93 31.65 27.70 23.01 16.78 12.60 9.71 7.64 6.11 4.97 4.10 3.4127.70 23.08 19.78 14.22 9.99 7.28 5.47 4.21 3.31 2.65 2.16 1.78 1.48
ML50 500 600 20650 46 55.94 46.62 39.96 34.96 28.54 20.81 15.63 12.04 9.47 7.58 6.17 5.08 4.2434.96 29.14 24.97 17.64 12.39 9.03 6.79 5.23 4.11 3.29 2.68 2.20 1.84
MB55 550 600 6580 14 20.38 15.62 11.48 8.79 6.94 5.62 4.65 3.84 3.02 2.4212.74 9.76 7.17 5.49 3.95 2.88 2.16 1.67 1.31 1.05
MD55 550 600 10791 19 20.42 17.02 14.59 12.76 11.35 9.93 8.17 6.29 4.95 3.96 3.22 2.6512.76 10.64 9.12 7.98 6.47 4.72 3.55 2.73 2.15 1.72 1.40 1.15
MG55 550 600 15813 30 46.39 38.66 33.14 25.41 20.07 15.93 11.97 9.22 7.25 5.81 4.72 3.89 3.2429.00 24.16 20.16 13.51 9.49 6.92 5.20 4.00 3.15 2.52 2.05 1.69 1.41
MJ55 550 600 20812 38 45.99 38.33 32.85 28.75 25.55 20.97 15.76 12.14 9.54 7.64 6.21 5.12 4.2728.75 23.95 20.53 17.78 12.49 9.10 6.84 5.27 4.14 3.32 2.70 2.22 1.85
ML55 550 600 25824 47 58.07 48.39 41.48 36.29 32.26 26.02 19.55 15.06 11.84 9.48 7.71 6.35 5.3036.29 30.25 25.92 22.06 15.49 11.29 8.49 6.54 5.14 4.12 3.35 2.76 2.30
MB60 600 600 7943 13 19.15 15.96 12.62 9.66 7.63 6.18 5.11 4.29 3.64 2.9211.97 9.97 7.88 6.04 4.77 3.47 2.61 2.01 1.58 1.27
MD60 600 600 13037 18 19.20 16.00 13.71 12.00 10.67 9.60 8.73 7.58 5.98 4.79 3.89 3.21 2.6712.00 10.00 8.57 7.50 6.67 5.70 4.28 3.30 2.60 2.08 1.69 1.39 1.16
MG60 600 600 19277 28 47.65 39.71 34.03 28.09 22.19 17.98 14.59 11.24 8.84 7.08 5.76 4.74 3.9529.78 24.82 21.27 16.47 11.56 8.43 6.33 4.88 3.84 3.07 2.50 2.06 1.72
MJ60 600 900 25453 36 41.17 34.31 29.41 25.73 22.87 20.59 18.71 14.84 11.67 9.35 7.60 6.26 5.2225.73 21.44 18.38 16.08 14.30 11.13 8.36 6.44 5.07 4.06 3.30 2.72 2.27
ML60 600 900 31594 45 51.98 43.31 37.13 32.48 28.88 25.99 23.63 18.42 14.49 11.60 9.43 7.77 6.4832.48 27.07 23.20 20.30 18.05 13.82 10.38 8.00 6.29 5.04 4.09 3.37 2.81
MB65 650 600 9436 15 26.96 18.72 13.76 10.53 8.32 6.74 5.57 4.68 3.99 3.44 2.8216.85 11.70 8.60 6.58 5.20 4.13 3.10 2.39 1.88 1.50 1.22
MD65 650 600 15496 20 36.08 30.07 24.31 18.61 14.71 11.91 9.84 8.27 7.05 5.69 4.63 3.81 3.1822.55 18.79 15.19 11.63 9.19 6.78 5.09 3.92 3.08 2.47 2.01 1.65 1.38
MG65 650 600 23088 29 48.66 40.55 34.76 30.41 24.31 19.69 16.27 13.46 10.59 8.48 6.89 5.68 4.7430.41 25.34 21.72 19.01 13.85 10.10 7.59 5.84 4.60 3.68 2.99 2.47 2.06
MJ65 650 900 30572 37 42.38 35.31 30.27 26.49 23.54 21.19 19.26 17.66 14.02 11.23 9.13 7.52 6.2726.49 22.07 18.92 16.55 14.71 13.24 10.05 7.74 6.09 4.87 3.96 3.26 2.72
ML65 650 900 37960 46 53.64 44.70 38.31 33.52 29.80 26.82 24.38 22.13 17.41 13.94 11.33 9.34 7.7933.52 27.94 23.94 20.95 18.62 16.60 12.47 9.61 7.56 6.05 4.92 4.05 3.38
MB70 700 900 11057 16 29.20 20.27 14.90 11.40 9.01 7.30 6.03 5.07 4.32 3.72 3.24 2.7218.25 12.67 9.31 7.13 5.63 4.56 3.63 2.80 2.20 1.76 1.43 1.18
MD70 700 900 18168 21 33.18 27.65 23.70 20.16 15.93 12.90 10.66 8.96 7.63 6.58 5.42 4.47 3.7320.73 17.28 14.81 12.60 9.96 7.95 5.97 4.60 3.62 2.90 2.35 1.94 1.62
MG70 700 900 27247 29 43.44 36.20 31.03 27.15 24.13 21.41 17.69 14.87 12.50 10.01 8.13 6.70 5.5927.15 22.62 19.39 16.97 15.08 11.92 8.95 6.90 5.42 4.34 3.53 2.91 2.43
MJ70 700 900 36171 37 43.24 36.04 30.89 27.03 24.02 21.62 19.66 18.02 16.59 13.28 10.80 8.90 7.4227.03 22.52 19.31 16.89 15.02 13.51 11.88 9.15 7.20 5.76 4.69 3.86 3.22
ML70 700 900 44922 46 54.89 45.74 39.20 34.30 30.49 27.44 24.95 22.87 20.60 16.50 13.41 11.05 9.2134.30 28.59 24.50 21.44 19.06 17.15 14.76 11.37 8.94 7.16 5.82 4.80 4.00
MD80 800 900 24153 22 34.59 28.83 24.71 21.62 18.37 14.88 12.30 10.34 8.81 7.59 6.61 5.81 4.9521.62 18.02 15.44 13.51 11.48 9.30 7.69 6.11 4.81 3.85 3.13 2.58 2.15
MG80 800 900 36606 30 44.35 36.96 31.68 27.72 24.64 22.17 20.16 17.25 14.70 12.67 10.93 9.01 7.5127.72 23.10 19.80 17.32 15.40 13.86 12.03 9.26 7.29 5.83 4.74 3.91 3.26
MJ80 800 900 48803 38 44.27 36.89 31.62 27.67 24.59 22.13 20.12 18.44 17.03 15.81 14.57 12.01 10.0127.67 23.06 19.76 17.29 15.37 13.83 12.58 11.53 9.71 7.78 6.32 5.21 4.34
ML80 800 900 60635 47 56.53 47.11 40.38 35.33 31.41 28.27 25.70 23.55 21.74 20.19 18.10 14.92 12.4435.33 29.44 25.24 22.08 19.63 17.67 16.06 14.72 12.07 9.66 7.86 6.47 5.40
MD90 900 900 30990 22 35.65 29.71 25.46 22.28 19.80 16.86 13.94 11.71 9.98 8.60 7.49 6.59 5.8322.28 18.57 15.91 13.93 12.38 10.54 8.71 7.32 6.17 4.94 4.02 3.31 2.76
MG90 900 900 47355 31 44.57 37.14 31.83 27.85 24.76 22.28 20.26 18.57 16.73 14.42 12.57 11.04 9.7127.85 23.21 19.90 17.41 15.47 13.93 12.66 11.61 9.43 7.55 6.14 5.06 4.22
MJ90 900 900 63349 39 44.57 37.14 31.84 27.86 24.76 22.29 20.26 18.57 17.14 15.92 14.86 13.93 12.9927.86 23.21 19.90 17.41 15.48 13.93 12.66 11.61 10.71 9.95 8.21 6.76 5.64
ML90 900 900 78732 48 57.32 47.77 40.94 35.83 31.85 28.66 26.06 23.88 22.05 20.47 19.11 17.91 16.1535.83 29.86 25.59 22.39 19.90 17.91 16.28 14.93 13.78 12.55 10.20 8.41 7.01
MG100 1000 900 59492 32 44.29 36.91 31.63 27.68 24.60 22.14 20.13 18.45 17.03 15.82 14.09 12.38 10.9727.68 23.07 19.77 17.30 15.38 13.84 12.58 11.53 10.65 9.48 7.71 6.35 5.30
MJ100 1000 900 79809 40 44.35 36.96 31.68 27.72 24.64 22.18 20.16 18.48 17.06 15.84 14.78 13.86 13.0427.72 23.10 19.80 17.32 15.40 13.86 12.60 11.55 10.66 9.90 9.24 8.52 7.10
ML100 1000 900 99214 49 57.50 47.92 41.07 35.94 31.94 28.75 26.14 23.96 22.12 20.54 19.17 17.97 16.91
34
Load tables - Parallel beamsDesign examples and load tables
Span (m)18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34
7.44 6.33 5.42 4.69 4.07 3.57 3.14 2.78 2.47 2.20 1.98 1.78 1.61 1.46 1.32 1.21 1.1018 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 3437 41 45 50 55 60 65 71 77 83 89 96 100 109 116 124 131
Notes on load tables1. All loads are in kilo Newtons per
metre (kN/m),calculated in accordance with BS 5950-1 and 5:1998.
2. Figures in black type are ultimate totalloads per metre.
3. BS 5950: 1998 recommends that imposed load deflections are limited tospan/360 where applicable. Therefore safeworking loads shown in red type arecalculated with a deflection limit of span/360.
4. By calculating Unfactored imposed loads andultimate total loads in kilo Newtons per linear metre (kN/m) and referring to the appropriate table a suitable selection can be made by satisfying both imposed load and total load criteria.
5. Tables are based on:
5.1 The top (compression) chord of the beamis provided with adequate lateral restraints atspacings not greater than 1.8m.
5.2 The load is uniformly distributed on thefull span.
6. Roof beams are fabricated with an upwardcamber. The approximate camber for variousspans is shown in the tables.
Floor joists are supplied straight unless acamber is specifically requested.
7. When design requirements are for depthsgreater than 2.0m, or when curved, pitched ortapered profiles are required, please refer toLatticeSPEC design software or consult theMetsec Lattice Beam Technical Department.
2.240.97
2.881.253.57 3.03 2.601.55 1.32 1.13
2.731.193.60 3.06 2.621.56 1.33 1.144.46 3.79 3.25 2.811.94 1.65 1.41 1.22
3.33 2.831.45 1.234.40 3.74 3.21 2.771.91 1.62 1.39 1.205.46 4.64 3.98 3.44 2.992.37 2.01 1.73 1.49 1.30
2.681.163.99 3.39 2.911.73 1.47 1.265.28 4.49 3.85 3.33 2.89 2.532.29 1.95 1.67 1.44 1.26 1.106.56 5.58 4.78 4.13 3.59 3.142.85 2.42 2.08 1.79 1.56 1.36
3.14 2.671.36 1.164.71 4.00 3.43 2.96 2.582.04 1.74 1.49 1.29 1.126.25 5.31 4.56 3.94 3.42 3.002.71 2.31 1.98 1.71 1.49 1.307.76 6.60 5.66 4.89 4.25 3.723.37 2.86 2.46 2.12 1.85 1.614.17 3.55 3.04 2.631.81 1.54 1.32 1.146.32 5.38 4.61 3.98 3.46 3.032.75 2.33 2.00 1.73 1.50 1.328.43 7.17 6.15 5.31 4.62 4.043.66 3.11 2.67 2.30 2.00 1.75
10.48 8.91 7.64 6.60 5.74 5.024.55 3.87 3.31 2.86 2.49 2.185.20 4.55 3.90 3.37 2.93 2.572.32 1.98 1.69 1.46 1.27 1.118.18 6.96 5.96 5.15 4.48 3.923.55 3.02 2.59 2.24 1.94 1.70
10.95 9.31 7.98 6.89 5.99 5.254.75 4.04 3.46 2.99 2.60 2.28
13.60 11.57 9.92 8.57 7.45 6.525.90 5.02 4.30 3.72 3.23 2.839.79 8.74 7.49 6.47 5.63 4.934.46 3.79 3.25 2.81 2.44 2.14
12.32 11.67 10.05 8.68 7.55 6.615.98 5.09 4.36 3.77 3.28 2.87
15.97 14.57 12.50 10.79 9.39 8.22
2.771.20
2.641.143.27 2.901.42 1.26
2.671.163.56 3.15 2.801.54 1.37 1.214.42 3.91 3.48 3.10 2.781.92 1.70 1.51 1.35 1.21
3.45 3.05 2.711.50 1.33 1.184.62 4.09 3.63 3.24 2.91 2.622.00 1.77 1.58 1.41 1.26 1.145.74 5.08 4.51 4.03 3.61 3.25 2.94 2.662.49 2.20 1.96 1.75 1.57 1.41 1.28 1.164.34 3.84 3.41 3.05 2.731.88 1.67 1.48 1.32 1.195.82 5.15 4.58 4.09 3.66 3.30 2.982.52 2.23 1.99 1.77 1.59 1.43 1.297.23 6.40 5.69 5.08 4.55 4.10 3.70 3.36 3.05 2.78 2.54
35
Design examples and load tables
Notes on load tables1. All loads are in kilo Newtons per metre
(kN/m), and are calculated in accordance with BS 5950-1: 2000 and 5: 1998.
2. Figures in black type are Ultimate total loadsper metre.
3. BS 5950-1: 2000 and 5: 1998 recommends thatUnfactored imposed load deflections arelimited to span/360 where applicable.Therefore safe working loads shown in red
type are calculated with a deflection limit ofspan/360.
4. By calculating Unfactored imposed loads andUltimate total loads in kilo Newtons per linearmetre (kN/m) and referring to the appropriatetable a suitable selection can be made bysatisfying both imposed load and total loadcriteria.
5. Tables are based on:
5.1 The top (compression) chord of the beam isprovided with adequate lateral restraints atspacings not greater than 1.8m.
5.2 The load is uniformly distributed on thefull span.
6. Roof beams are fabricated with an upwardcamber. The approximate camber for variousspans is shown in the tables.
Floor joists are supplied straight unless acamber is specifically requested.
7. When design requirements are for depthsgreater than 2.0m, or when curved, pitched ortapered profiles are required, please refer toLatticeSPEC design software or consult theMetsec Lattice Beam Technical Department.
36
Load tables - Parallel beams Design examples and load tables
Joist Overall Typical node Ixx Self weight
type depth (mm) centres (mm) (cm4) (kg/m)
Span (m)Standard camber (mm)
10 12 14 16 18 20 22 24 26 28 30 32 34
10 12 14 16 18 20 22 24 26 28 30 32 3412 16 22 29 37 45 55 65 77 89 100 116 131
MG110 1100 900 73019 32 21.81 18.18 15.58 13.63 10.84 8.78 6.91 5.3213.63 11.36 9.74 7.80 5.48 3.99 3.00 2.31
MJ110 1100 900 98184 40 21.87 18.22 15.62 13.67 12.15 10.93 9.29 7.16 5.63 4.51 3.6613.67 11.39 9.76 8.54 7.36 5.37 4.03 3.11 2.44 1.96 1.59
ML110 1100 900 122080 50 28.61 23.85 20.44 17.88 15.90 14.31 11.55 8.90 7.00 5.60 4.56 3.75 3.1317.88 14.90 12.77 11.18 9.15 6.67 5.01 3.86 3.04 2.43 1.98 1.63 1.36
MG120 1200 1200 87935 31 19.76 16.47 14.11 12.35 10.98 9.64 7.97 6.41 5.0412.35 10.29 8.82 7.72 6.59 4.81 3.61 2.78 2.19
MJ120 1200 1200 118472 39 19.70 16.42 14.07 12.32 10.95 9.85 8.96 8.21 6.79 5.44 4.4212.32 10.26 8.80 7.70 6.84 6.16 4.87 3.75 2.95 2.36 1.92
ML120 1200 1200 147330 48 26.38 21.98 18.84 16.49 14.66 13.19 11.99 10.74 8.45 6.76 5.50 4.53 3.7816.49 13.74 11.78 10.30 9.16 8.05 6.05 4.66 3.67 2.94 2.39 1.97 1.64
MJ130 1300 1200 140675 40 19.42 16.18 13.87 12.14 10.79 9.71 8.83 8.09 7.47 6.46 5.2512.14 10.11 8.67 7.58 6.74 6.07 5.52 4.45 3.50 2.80 2.28
ML130 1300 1200 174965 49 26.16 21.80 18.69 16.35 14.53 13.08 11.89 10.90 10.03 8.03 6.53 5.38 4.4916.35 13.62 11.68 10.22 9.08 8.17 7.19 5.54 4.35 3.49 2.83 2.34 1.95
MJ140 1400 1200 164792 40 18.91 15.76 13.51 11.82 10.51 9.46 8.60 7.88 7.27 6.76 6.15 5.0711.82 9.85 8.44 7.39 6.57 5.91 5.37 4.93 4.10 3.28 2.67 2.20
ML140 1400 1200 204984 50 25.80 21.50 18.43 16.13 14.33 12.90 11.73 10.75 9.92 9.21 7.65 6.30 5.2616.13 13.44 11.52 10.08 8.96 8.06 7.33 6.48 5.10 4.08 3.32 2.74 2.28
MJ150 1500 1200 190823 41 18.32 15.27 13.09 11.45 10.18 9.16 8.33 7.63 7.05 6.54 6.11 5.7311.45 9.54 8.18 7.16 6.36 5.73 5.21 4.77 4.40 3.80 3.09 2.55
ML150 1500 1200 237388 51 25.33 21.11 18.09 15.83 14.07 12.67 11.51 10.55 9.74 9.05 8.44 7.30 6.0915.83 13.19 11.31 9.89 8.80 7.92 7.20 6.60 5.91 4.73 3.85 3.17 2.64
MJ160 1600 1200 218769 42 17.67 14.72 12.62 11.04 9.82 8.83 8.03 7.36 6.80 6.31 5.89 5.52 5.2011.04 9.20 7.89 6.90 6.14 5.52 5.02 4.60 4.25 3.94 3.54 2.92 2.43
ML160 1600 1200 272176 51 24.77 20.64 17.69 15.48 13.76 12.38 11.26 10.32 9.53 8.85 8.26 7.74 6.9815.48 12.90 11.06 9.67 8.60 7.74 7.04 6.45 5.95 5.42 4.41 3.63 3.03
MJ170 1700 1200 248628 42 16.97 14.14 12.12 10.61 9.43 8.48 7.71 7.07 6.53 6.06 5.66 5.30 4.9910.61 8.84 7.58 6.63 5.89 5.30 4.82 4.42 4.08 3.79 3.54 3.31 2.77
ML170 1700 1200 309348 52 24.13 20.11 17.24 15.08 13.41 12.07 10.97 10.05 9.28 8.62 8.04 7.54 7.1015.08 12.57 10.77 9.43 8.38 7.54 6.86 6.28 5.80 5.39 5.01 4.13 3.44
MJ180 1800 1200 280402 43 16.24 13.54 11.60 10.15 9.02 8.12 7.38 6.77 6.25 5.80 5.41 5.08 4.7810.15 8.46 7.25 6.35 5.64 5.08 4.61 4.23 3.90 3.63 3.38 3.17 2.99
ML180 1800 1200 348905 53 23.43 19.53 16.74 14.65 13.02 11.72 10.65 9.76 9.01 8.37 7.81 7.32 6.8914.65 12.21 10.46 9.15 8.14 7.32 6.66 6.10 5.63 5.23 4.88 4.58 3.88
MJ190 1900 1200 314089 44 15.51 12.92 11.08 9.69 8.62 7.75 7.05 6.46 5.96 5.54 5.17 4.85 4.569.69 8.08 6.92 6.06 5.38 4.85 4.41 4.04 3.73 3.46 3.23 3.03 2.85
ML190 1900 1200 390846 54 22.69 18.91 16.21 14.18 12.61 11.35 10.32 9.46 8.73 8.11 7.56 7.09 6.6714.18 11.82 10.13 8.87 7.88 7.09 6.45 5.91 5.46 5.07 4.73 4.43 4.17
MJ200 2000 1200 349691 44 14.77 12.31 10.55 9.23 8.21 7.39 6.71 6.15 5.68 5.28 4.92 4.62 4.349.23 7.69 6.59 5.77 5.13 4.62 4.20 3.85 3.55 3.30 3.08 2.89 2.72
ML200 2000 1200 435172 55 21.92 18.27 15.66 13.70 12.18 10.96 9.96 9.13 8.43 7.83 7.31 6.85 6.4513.70 11.42 9.79 8.56 7.61 6.85 6.23 5.71 5.27 4.89 4.57 4.28 4.03
Notes on load tables1. All loads are in kilo Newtons per metre (kN/m),
and are calculated in accordance with BS 5950-1: 2000and 5: 1998.
2. Figures in black type are Ultimate total loads per metre.
3. BS 5950-1: 2000 and 5: 1998 recommends thatUnfactored imposed load deflections are limited tospan/360 where applicable. Therefore safe workingloads shown in red type are calculated with a deflectionlimit of span/360.
4. By calculating Unfactored imposed loads and Ultimate
total loads in kilo Newtons per linear metre (kN/m) andreferring to the appropriate table a suitable selectioncan be made by satisfying both imposed load and totalload criteria.
5. Tables are based on:
5.1 The top (compression) chord of the beam isprovided with adequate lateral restraints at spacingsnot greater than 1.8m.
5.2 The load is uniformly distributed on the full span.
6. Roof beams are fabricated with an upward camber. The approximate camber for various spans is shown inthe tables.
Floor joists are supplied straight unless a camber isspecifically requested.
7. When design requirements are for depths greater than 2.0m, or when curved, pitched or tapered profiles are required, please refer to LatticeSPECdesign software or consult the Metsec Lattice BeamTechnical Department.
37
Load tables - Composite floor beamsDesign examples and load tables
Joist Overall Self weight
type depth (mm) (kg/m) 9 10 11 12 13 14 15MC45 450 45.0 38.00 30.80
29.66 21.90MC50 500 45.0 41.66 33.80
36.00 26.60MC55 550 49.5 55.55 45.50 37.63 31.58
51.66 38.20 28.72 22.08MC60 600 50.5 55.55 49.20 40.63 34.16 29.07
60.66 44.90 33.72 26.00 20.46MC65 650 56.5 55.55 50.00 45.45 41.66 37.76 32.57
82.77 61.40 46.09 35.50 27.92 22.35MC70 700 56.5 55.55 50.00 45.45 41.66 38.46 34.85 30.33
95.11 70.60 53.00 40.83 32.07 25.71 20.86MC75 750 56.5 55.55 50.00 45.45 41.66 38.46 35.71 32.33
108.22 80.40 60.36 46.50 36.53 29.28 23.80
Notes on composite floor beam load tables1. All loads are in kilo Newtons per metre (kN/m)
2. Loads shown in black type are Ultimate total loads/m
3. Loads shown in red type are Unfactored total loads/m calculated with a deflection limit of span/360
4. Pre-camber available
For spans in excess of 15m or design parameters not covered in these load tables, please contact Metsec Lattice Beam Technical Department.
Designation
The designation of a composite beam is given by a simple letterand number code, as follows:
MC 60 (56)
Thus MC60(56) comprises MC type chord section with anoverall beam depth of 600mm and a weight of 56kg per metre.
Parameters assumed for load tables
Beam spacing: 2.5m. Concrete: Grade 40. Modular ratio of 10.Construction load: 0.5kN/m2 construction load is taken into account, in accordance with BS5950: Part 3.No allowance is made for heaping of concrete during casting. Frequency: 4.0Hz (min). Fire limit: 60 minutes.
3838
Services and design software
Services and general notes
Detailing serviceWorking from Architects’ and ConsultingEngineers’ drawings, Metsec’s team of engineersand specialist 3D draughtsmen will producestructural layouts and sections to assist the siteteam along with full fabrication drawings.
NBS PlusTechnical specifications for Metseclattice beams are also available viaNBS Plus (www.nbsplus.com). Thisfacility enables you to create concise,
technically accurate up to date specificationswhich can be copied directly into your buildingspecifications thereby maintaining specificationquality and saving you time.
By using NBS Building you can be assured youare using the industry standard specificationsystem that conforms to best practice. It providesextensive guidance to help you select and edit theright clauses for your project
Customer serviceMetsec are committed to providing the highestlevels of customer satisfaction and ensure that ourstaff are trained to the highest possible levels inorder to assist our customers at all stages of thedesign and installation process.
Our sales teams in particular have a thoroughknowledge of our products and should be able toresolve most of your questions quickly andprofessionally.
Research and developmentMetsec operate a policy of continuous researchand development reserving the rights to changethe specification for products in this literaturewithout prior notice.
Company RegistrationMetsec plc.Registered Office: Broadwell Road, Oldbury,West Midlands B69 4HF.Company Number: 1551970 (England)
CPDThe Metsec Lattice Beam Division offer acontinuous professional development presentationwhich has been accredited by the ConstructionCPD Certification Service in the use andapplication of Metsec products and LatticeSPECdesign software. These can easily can be arrangedby contacting the Metsec Lattice Beam Divisionon 0121 601 6000 or by visitingwww.metsec.com.
Tividale High School, West Midlands.
3939
Services and design software
Software
Design software
Metsec are pioneers when it comes to theprovision of design software packages. Our firstpackage for lattice design was produced in 1989,since when we have been continually updatingand improving the packages that we offer.
Today, Metsec produce a number of stand-alonedesign software packages including LatticeSPECfor our complete range of lattice beam solutions.
This package enables the quick and easy designof all types of lattice beams. It also includes anoption to export the profile of the lattice with itsend section in .dxf format, enabling specifiers toimport direct to their working drawings and toquickly and efficiently complete their detailing.
For a free copy of the latest LatticeSPEC softwareplease contact Metsec on 0121 601 6000 or visitour website: www.metsec.com
Designed and produced by Communication Design Partnership 01959 562777
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx xxxxxx
Metsec plcBroadwell Road, Oldbury, West Midlands, B69 4HFTel: 44+ (0) 121 601 6000Fax: 44+ (0) 121 601 6109email: [email protected]
Lattice Beam DivisionLightweight Lattice Joists and TrussesTel: +44(0) 121 601 6000Fax: +44(0) 121 601 [email protected]
Purlin DivisionZ and C-Sections for Building Shell ApplicationsC-Sections for Mezzanine FloorsTel: +44(0) 121 601 6000Fax: +44(0) 121 601 [email protected]
Framing DivisionFast-Track Steel Building SystemsTel: +44(0) 121 601 6000Fax: +44(0) 121 601 [email protected]
Metstrut DivisionCable Ladder and Metal Framing Systems for M&E SupportTel: +44(0) 121 601 6085Fax: +44(0) 121 601 [email protected]
Hepsec DivisionDry Linings, Partitioning and Ceiling SupportSystemsTel: +44(0) 2476 585600Fax: +44(0) 2476 [email protected]
Metsec plc is a member of the Profilform Divisionof the voestalpine group with companies inAustria, Belgium, Brazil, Czech Republic, France,Germany, Russia and the U.S.A.
© Copyright METSEC plc 2008
In the interests of a policy of continuous research and development,
Metsec Building Products Ltd reserve the right to change the
specifications in this publication without prior notice.
Related Documents
