2001 ASD/LRFD Wind/Seismic Supplement - American Wood Council

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ASD/LRFD SUPPLEMENT – SPECIAL DESIGN PROVISIONS FOR WIND AND SEISMIC7MEMBERS ANDCONNECTIONS33.1 Framing 83.2 Sheathing 83.3 Connections 10Table 3.1.1.1 Wall Stud Bending Stress Increase Factors ..... 8Table 3.2ATable 3.2BNominal Uniform Load Capacities, psf, forWall Sheathing Resisting Wind Loads.............. 9Nominal Uniform Load Capacities, psf, forRoof Sheathing Resisting Wind Loads ........... 10AMERICAN FOREST & PAPER ASSOCIATION
8 MEMBERS AND CONNECTIONS3.1 Framing3.1.1 Wall FramingIn addition to gravity loads, wall framing shall bedesigned to resist induced wind and seismic forces. Theframing shall be designed using methods referenced in2.1.2.1 for allowable stress design (ASD) and 2.1.2.2 forstrength design (LRFD).3.1.1.1 Wall Stud Bending Stress Increase: The bendingstress for sawn lumber wood studs resisting out ofplane wind loads shall be permitted to be increased by thefactors in Table 3.1.1.1, in lieu of the 1.15 repetitive memberfactor, to take into consideration the load sharing andcomposite action provided by wood structural panelsheathing. The factor applies when studs are designed forbending, spaced no more than 16 inches on center, coveredon the inside with a minimum of ½-inch gypsumwallboard, and sheathed on the exterior with a minimumof 3/8-inch wood structural panel sheathing that is attachedto the studs using a minimum of 8d common nails spaced amaximum of 6 inches o.c. at panel edges and 12 inches o.c.at intermediate framing members.3.1.2 Floor FramingIn addition to gravity loads, floor framing shall bedesigned to resist induced wind and seismic forces. Theframing shall be designed using methods referenced in2.1.2.1 for allowable stress design (ASD) and 2.1.2.2 forstrength design (LRFD).3.1.3 Roof FramingIn addition to gravity loads, roof framing shall be designedto resist induced wind and seismic forces. Theframing shall be designed using methods referenced in2.1.2.1 for allowable stress design (ASD) and 2.1.2.2 forstrength design (LRFD).Table 3.1.1.1Wall Stud BendingStress Increase FactorsStud SizeSystem Factor2x4 1.52x6 1.42x8 1.32x10 1.22x12 1.153.2 Sheathing3.2.1 Wall SheathingExterior wall sheathing and its fasteners shall be capableof resisting and transferring out of plane wind loadsto the wall framing. Maximum spans and nominal uniformload capacities for wall sheathing materials are givenin Table 3.2A. The ASD allowable uniform load capacitiesto be used for wind design shall be determined bydividing the nominal uniform load capacities by a safetyfactor of 1.6. The LRFD factored uniform load capacitiesto be used for wind design shall be determined by multiplyingthe nominal uniform load capacities by a resistancefactor, φ b , of 0.85. Sheathing used in shear wall assem-blies to resist lateral forces shall be designed in accordancewith 4.3.3.2.2 Floor SheathingFloor sheathing shall be capable of resisting and transferringgravity loads to the floor framing. Sheathing usedin diaphragm assemblies to resist lateral forces shall bedesigned in accordance with 4.2.AMERICAN WOOD COUNCIL
Page 1 and 2: 2001 EDITIONSUPPLEMENTSpecial Desig
Page 3 and 4: ASD/LRFD SUPPLEMENT - SPECIAL DESIG
Page 9: 6 GENERAL DESIGN REQUIREMENTSG aG a
Page 13 and 14: 10 MEMBERS AND CONNECTIONS3.2.3 Roo
Page 20 and 21: Table 4.2B Nominal Unit Shear Value

2001 ASD/LRFD Wind/Seismic Supplement - American Wood Council

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