1 NSCP 2010 Revisions in Chapter 6 Wood 2 Summary of Revisions 1. The provisions are refined to incorporate local practices and corrections in the NSCP 2001. 2. List of available wood species has been updated. 3. Machine-Graded Lumber is included. 10/20/2010 11:21
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11
NSCP 2010Revisions in Chapter 6 Wood
22
Summary of Revisions
1.The provisions are refined to incorporate local practices and corrections in the NSCP 2001.
2.List of available wood species has been updated.
3.Machine-Graded Lumber is included.
10/20/2010 11:21
33
Summary of Revisions
1.The provisions are refined to incorporate local practices and corrections in the NSCP 2001.
2. List of available wood species has been updated.
3. Machine-Graded Lumber is included.
44
Revision 1
Example:
Item 619.5 Miscellaneous Fasteners
Figures 619.5.2-A to 619.5.2-C are included to show Withdrawal Connections
Example:
Mention of “UBC Standard 23-1” is removed.
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Revision 1
Example:
Reasonable and more practical rounding-off of numbers (relaxed conversion of English unit equivalents, i.e. 278 mm2 to 270 mm2; 30 m instead of 30.5 m.)
Example:
Units are made consistent. For size dimensions, use of mm. For distances, lengths, use of m.
66
Summary of Revisions
1. The provisions are refined to incorporate local practices and corrections in the
NSCP 2001.
2.List of available wood species has been updated.
3. Machine-Graded Lumber is included.
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77
Revision 2
Table 6-1: List per NSCP 2001
+
Table 6-35: Additional Unseasoned Structural Timber of Philippine Woods
88
Summary of Revisions
1. The provisions are refined to incorporate local practices and corrections in the
NSCP 2001.
2. List of available wood species has been updated.
3.Machine-Graded Lumber is included.
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99
Revision 3
NSCP 2001 : up to Section 621 only.
NSCP 2010 : Additional Section 622
Use of Machine-Graded Lumber
10
Detailed Comparison
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Section 601 - General
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NSCP 2001 NSCP 2010
601.1 Scope
Design Method601.2
601.2.1 Allowable Stress Design
601.2.2 Conventional Light-Frame Construction
Same
Same
Same
Same except that “mention of NSCP Volume 3 on Housing “ is added.
12
Section 601.2.1 Allowable Stress Design
Design using ASD methods shall resist the different load combinations in
accordance with the applicable requirements of Section 604.
203.4.1 Basic Load Combinations
D + F ; D + H + F + L + T
D + H + F + (Lr or R) ; D + H + F + 0.75[L + T + (Lr or R)]
D + H + F + (W or E/1.4)
No increase in allowable stresses shall be used with these load comb
except as specifically permitted by Section 203.4.2.
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Section 203.4.2 Alternate Basic Load Combinations
When using these alternate basic load comb, a 1/3 increase shall be
permitted in allowable stresses for all combinations , including W or E.
Section 604 – Design and Construction Requirements
20
NSCP 2001 NSCP 2010
604.1 General 604.1 General
Basically the same, except for Additional User Note Re: Use of NSCP 3 for single-family dwellings
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Section 604.1.4 The design and construction of conventional light-
frame wood structures shall be in accordance with Section 620.
Section 620 CONVENTIONAL LIGHT-FRAME CONSTRUCTION
DESIGN PROVISIONS
Only the ff: occupancies may be constructed in accordance with
this division;
1. One, two or 3-storey residential buildings
2. One-storey Occupancy Category IV Bldgs (Table 103-1)
3. Category V Occupancies
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Section 605 – Decay and Termite Protection
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NSCP 2001 NSCP 2010
605.1 Preparation of Building Site 605.1 ~ 605.4 Same
605.2 Wood Support Embedded in Ground
605.3 Under-floor Clearance
Plates, Sills and Sleepers605.4
605.5 Columns and Posts 605.5 Columns and Posts
“... pedestal shall project at least 150 mm above exposed earth...”
“... pedestal shall project at least 200 mm above exposed earth...”
“… concrete or masonry piers ... of approved wood of natural resistance to decay or treated wood is used.”
“… concrete or masonry piers ... of approved wood of natural resistance to decay.”
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Section 605 – Decay and Termite Protection
23
NSCP 2001 NSCP 2010
605.6 Girders Entering Masonry or Concrete Walls 605.6 ~ 605.10 Same
605.7 Under-Floor Ventilation
605.8 Wood and Earth Separation
605.9 Wood Supporting Roofs and Floors
605.10 Moisture Content of Treated Wood
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Section 605 – Decay and Termite Protection
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NSCP 2001 NSCP 2010
605.11 605.11 Similar, re-worded
605.12 Weather Exposure
“All wood used as permanent parts of retaining or crib walls...”
Retaining Walls
“Wood used in retaining or crib walls...”
605.12 Weather Exposure
Additional provision for glued-laminated timbers.
605.13 Water Splash 605.13 Water Splash – Similar, re-worded
“Where wood-frame walls and partitions... shall be protected with approved waterproof paper conforming to Section on Weather Protection.”
“Where wood-frame walls and partitions... shall be protected with approved waterproofing.”
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Section 606 – Wood Supporting Masonry or Concrete
25
NSCP 2001 NSCP 2010
606.1 606.1 Similar, re-wordedDead Load
606.2 Horizontal Force 606.2 Same, except that Exceptions are not shown. Instead, referred to Section 614.2.
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Section 607 – Wall Framing
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NSCP 2001 NSCP 2010
Same
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Section 608 – Floor Framing
27
NSCP 2001 NSCP 2010
-Essentially the same except for some relaxation in unit conversion from English to metric equivalents.
Hence, instead of “93 mm2” --- “90 mm2”; instead of “278 mm2” --- “270 mm2”; instead of “30.50 m”---”30 m”.
-Instead of “Fire stopping shall
consist of ...” --- “Fire blocks
shall consist of ...”
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Section 609 – Exterior Wall Coverings
28
NSCP 2001 NSCP 2010
609.1 General
609.2 Siding
609.3 Plywood
609.4 Shingles or Shakes
609.5 Particleboard
609.6 Hardboard
609.7 Nailing
609.1 ~ 609.7 Same
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Section 610 – Interior Paneling
29
NSCP 2001 NSCP 2010
Section 610 Same
30
Section 611 – Sheathing
30
NSCP 2001 NSCP 2010
611.1 ~ 611.2611.1 Structural Floor Sheathing
611.2 Structural Roof Sheathing
Same
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Section 612 – Mechanically Laminated Floors
31
NSCP 2001 NSCP 2010
- Essentially the same, except that all distances are now in meters (m), dimensions are in millimeters (mm).
Section 612
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Section 613 – Post-Beam Connection
32
NSCP 2001 NSCP 2010
SameSection 613
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Section 614 – Wood Shear Walls and Diaphragms
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NSCP 2001 NSCP 2010
614.1 General General 614.1
Additional User Note: “Unless permitted by the Building Official or by relevant provisions of NSCP Volume III, use of wood shear walls and diaphragms shall be limited...”
614.2 Wood Resisting Horizontal Forces Contributed by Masonry and Concrete
Essentially the same except that “Wood structural panels used for horizontal and vertical diaphragms shall conform to … or PNS”
614.4 Particleboard Diaphragms
614.5 Wood Shear Walls and Diaphragms in Seismic Zone 4
Same
For 614.5 ~ 614.6 Essentially the same except that NSCP Volume 3 is mentioned in the scope and lengths are in meters (m).614.6 Fiberboard Sheathing
Diaphragms
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Section 615 – Stresses
35
NSCP 2001 NSCP 2010
615.1 General General615.1
Additional Note: Values therein indicated are reference design values. All the tabulated design values include reductions for safety and are primarily intended for direct application in ASD.
Symbols are explained.
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Section 615 – Stresses
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NSCP 2001 NSCP 2010
615.2 Stresses in Piles Used as Structural Members
Same
615.3 Adjustment of Stresses Essentially the same except that the representative variables used in the provisions are listed and defined.
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Section 616 – Horizontal Member Design
37
NSCP 2001 NSCP 2010
616.1 Beam Span 616.1~616.8 Essentially the same
ERRATUM: 616.6
Cb = ( Ib + 9.5 ) / Ib; lb = mm
616.2 Flexure
616.3 Horizontal Shear
616.4 Horizontal Shear in Notched Beams
616.5 Design of Joints in Shear
616.6 Compression Perpendicular to Grain
616.7 Lateral Support
616.8 Lateral Support of Arches, Compression Chords of Trusses and Studs
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Section 617 – Column Design
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NSCP 2001 NSCP 2010
Same617.1 Column Classifications
617.2 Limitation on l/d RatioDELETED: “For individual members of spaced columns, see UBC Standard No. 25-15 ... or Division II of the Uniform Building Code, Volume 2, 1994.”
617.3 Simple Solid-Column Design Basically the same, except for bottom note. Now, le = Ke l.
617.4 Tapered Columns Same
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Section 618 – Flexural and Axial Loading Combined
39
NSCP 2001 NSCP 2010
618.1 Flexure and Axial Tension Additional: Variables redefined.
618.2 Flexure and Axial Compression Same
618.3 Spaced Columns Same
618.4 Truss Compression Chords Essentially the same, except that all distances are now in meters (m), size dimensions are now in millimeters (mm).
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Section 619 – Timber Connectors and Fasteners
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NSCP 2001 NSCP 2010
619.1 General Basically the same except that referrals to UBC sections have been removed.
619.2 Bolts
619.3 Nails and Spikes
619.4 Joist Hangers and Framing Anchors
619.5 Miscellaneous Fasteners
Same
Same
Same
Basically the same except that referrals to UBC sections have been removed.
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Section 620 – Conventional Light-Frame Construction Provisions
41
NSCP 2001 NSCP 2010
620.1 General Classification “Group U Occupancies in NSCP 2001” has been corrected to “Category V”
620.2 Design of Portions Same
620.3 Additional Requirements for Conventional Construction in High-wind Areas
Essentially the same except that referral to UBC has been deleted.
42
Section 620 – Conventional Light-Frame Construction Provisions
42
NSCP 2001 NSCP 2010
620.4 Additional Requirements for Conventional Construction in Seismic Zone 2
Minor changes: Wind speed referred to now is “125 kph (formerly 129 kph in NSCP 2001)” and “10.0m (formerly 10.20 in NSCP 2001)”
DELETED “Braced Wall Lines for High Wind” provisions
620.5 Additional Requirements for Conventional Construction in Seismic Zone 4
Essentially the same except that all lengths are in meters (m), and significant digits have been reduced, i.e. Instead of “83.61 m2”--”84 m2” is used.
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Section 620 – Conventional Light-Frame Construction Provisions
43
NSCP 2001 NSCP 2010
620.6 GirdersEssentially the same, except there is mention of NSCP Volume 3.
620.7 Floor Joists Essentially the same, except there is mention of NSCP Volume 3; All lengths are in meters (m).
620.8 Subflooring Same
620.9 Particleboard Underlayment Same
620.10 Wall Framing Essentially the same except that all lengths are in meters (m).
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Section 621 – Metal Plate Connected Wood Truss Design