6b Nscp 2010 Wood

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NSCP 2010Revisions in Chapter 6 Wood

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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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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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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.

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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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Revision 2

Table 6-1: List per NSCP 2001

+

Table 6-35: Additional Unseasoned Structural Timber of Philippine Woods

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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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Revision 3

NSCP 2001 : up to Section 621 only.

NSCP 2010 : Additional Section 622

Use of Machine-Graded Lumber

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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.

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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.

D + H + F + 0.75[ L + Lr + (W or E/1.4)] ;

0.60D + W + H ; 0.60D + E/1.4 + H

D + L + (Lr or R) ; D + L + W

D + L + E/1.4

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Section 601.2.2 Conventional Light-Frame Construction.

The design and construction. of conventional light-frame wood

structures shall be in accordance with the applicable requirements of

Section 604 and the NSCP Vol 3.

604.1.2 Wind and Earthquake load-resisting systems for all engineered

wood structures shall be designed and constructed in accordance with

the requirements of Section 614.

Section 614 WOOD SHEAR WALLS AND DIAPHRAGMS

Unless permitted by the Bldg Official or by relevant provisions of NSCP

Vol. 3,, use of wood shear walls and diaphragms shall be limited to

1 to 2-storey dwellings.

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Section 602 - Definitions

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NSCP 2001 NSCP 2010

New Terms defined

FOREST PRODUCTS RESEARCH AND DEVELOPMENT INSTITUTE (FPRDI)

MACHINE -GRADED LUMBER (MGL)

MOISTURE CONTENT (MC)

STRUCTURAL GLUED-LAMINATED TIMBER

BRACED WALL LINE

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Section 603 – Minimum Quality

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NSCP 2001 NSCP 2010

603.1 Quality and Identification

“All preservatively treated wood required to be treated shall be identified by the quality mark of an approved inspection agency.” - DELETED

603.2

603.1 Quality and Identification

Minimum Capacity or Grade

“Studs, joists, rafters... shall be of at least minimum grades... set forth in Table 6.1 or Table 6.2”

“Studs, joists, rafters... shall be of at least minimum grades... set forth in Table 6.1 or Table 6.2 or Table 6.35”

Minimum Capacity or Grade

603.2

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NSCP 2001 NSCP 2010

603.2 Minimum Capacity or Grade - Continued

“Wood structural panels shall be of grades specified in .... UBC Standard 23-2 and UBC 23-3”

“Wood structural panels shall be of grades specified in .... PNS”

Minimum Capacity or Grade - Continued

603.2

603.3 Timber Connectors and Fasteners

603.3 Timber Connectors and Fasteners – Same

603.4 Fabrication, Installation and Manufacture

Fabrication, Installation and Manufacture - Same

603.4

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NSCP 2001 NSCP 2010

603.4 Fabrication, Installation and Manufacture

Fabrication, Installation and Manufacture

603.4

603.4.1 AdditionalGeneral

603.4.2 Timber, Connectors and Fasteners

603.4.3 Metal Plate-Connected Wood Trusses

603.4.4 Structural Glued-Laminated Lumber

603.4.5 Dried Fire Retardant-Treated Wood

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NSCP 2001 NSCP 2010

Same603.5 ~ 603.8603.5 Dried Fire-Retardant-Treated Wood

603.6 Size of Structural Members

603.7 Shrinkage

603.8 Rejection

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Section 604 – Design and Construction Requirements

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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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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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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

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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

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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

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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

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NSCP 2001 NSCP 2010

Section 610 Same

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Section 611 – Sheathing

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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

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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

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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

614.2 Same

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Section 614 – Wood Shear Walls and Diaphragms

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NSCP 2001 NSCP 2010

614.3 Diagonally Sheathed Diaphragms Wood Diaphragms 614.3

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

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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

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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

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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

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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.

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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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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

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NSCP 2001 NSCP 2010

621.1 Design and Fabrication Same

621.2 Performance

621.3 In-plant Inspection

621.4 Marking

Same

Same

Same

END OF CHAPTER 6 FOR NSCP 2001

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Section 622 – Use of Machine Graded Lumber (MGL)

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NSCP 2001 NSCP 2010

622.1 General

622.2 Design Properties for Machine Graded Lumber

622.3 Design Using Machine Graded Lumber

622.4 Preservative Treatment

622.5 Moisture Content

622.6 Markings

END

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THANK YOU !

It was a pleasure having you all!

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6b Nscp 2010 Wood

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