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

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ASD/LRFD SUPPLEMENT – SPECIAL DESIGN PROVISIONS FOR WIND AND SEISMIC9Table 3.2A Nominal Uniform Load Capacities, psf, for Wall Sheathing ResistingWind Loads 1Sheathing Type 3 Span Rating or Grade MinimumThickness(in.)Sheathing Long Dimension Orientation:Perpendicular to SupportsMaximumStud Spacing(in.)Actual StudSpacing (in.)Parallel to SupportsMaximumStud Spacing(in.)Actual StudSpacing (in.)12 16 24 12 16 243Wood Structural Panels 4(Sheathing Grades, C-C,C-D, C-C Plugged, OSB)Particleboard Sheathing(M-S Exterior Glue)Particleboard PanelSiding(M-S Exterior Glue)Hardboard Siding(Direct to Studs)24/024/1632/1640/2048/24Lap SidingShiplap Edge Panel SidingSquare Edge Panel Siding3/87/1615/3219/3223/323/81/25/83/47/167/167/16242424242416161624162424Nominal UniformLoads (psf)4255406259501160240305355595805105135155265360(contactmanufacturer)(contactmanufacturer)460460460260260260-115115242424242416161624-2424Nominal UniformLoads (psf)90110155255380506090145215–25 240 265 290 2(contactmanufacturer)(contactmanufacturer)-460460-260260-115115MEMBERS AND CONNECTIONSCellulosic FiberboardSheathingRegularStructuralStructural1/21/225/321. Nominal capacities shall be adjusted in accordance with Section 3.2.1 to determine ASD uniform load capacity and LRFD uniform resistances.2. Sheathing shall be OSB or plywood with 4 or more plies.3. Wood structural panels shall conform to the requirements for its type in DOC PS 1 or PS2. Particleboard sheathing shall conform to ANSI A208.1.Hardboard panel and siding shall conform to the requirements of AHA A135.5 or AHA A135.4 as applicable. Cellulosic fiberboard sheathing shallconform to AHA A194.1 or ASTM C208.4. Tabulated values are for maximum bending loads from wind. Loads are limited by bending or shear stress assuming a 2-span continuous condition.For more information, see the ASD Wood Structural Panels Supplement.------------16161690135165507590---AMERICAN FOREST & PAPER ASSOCIATION
10 MEMBERS AND CONNECTIONS3.2.3 Roof SheathingRoof sheathing and its fasteners shall be capable ofresisting and transferring out of plane wind and gravityloads to the roof framing. Maximum spans and nominaluniform load capacities for roof sheathing materials aregiven in Table 3.2B. The ASD allowable uniform loadcapacities to be used for out of plane wind design shall bedetermined by dividing the nominal uniform load capacitiesby a safety factor of 1.6. The LRFD factored uniformload capacities to be used for wind design shall be determinedby multiplying the nominal uniform load capacitiesby a resistance factor, φ b , of 0.85. Sheathing used in diaphragmassemblies to resist lateral forces shall be designedin accordance with 4.2.Table 3.2B Nominal Uniform Load Capacities, psf, for Roof Sheathing ResistingWind Loads 1Sheathing Type Span Rating or Grade MinimumThickness(in.)Sheathing Long Dimension AppliedPerpendicular to SupportsRafter/Truss Spacing (in.)Wood Structural Panels 2,3(Sheathing Grades, C-C,C-D, C-C Plugged, OSB)Wood Structural Panels 2,3(Single Floor Grades,Underlayment, C-CPlugged)24/024/1632/1640/2048/2416 o.c.20 o.c.24 o.c.32 o.c.48 o.c.3/87/1615/3219/3223/3219/3219/3223/327/81-3/3212 16 19.2 244255406259501160705815108513901790Nominal Uniform Loads (psf)240305355595805395455610830129516521024541556027532042557510601. Nominal capacities shall be adjusted in accordance with Section 3.2.3 to determine ASD uniform load capacity andLRFD uniform resistances.2. Wood structural panels shall conform to the requirements for its type in DOC PS 1 or PS2.3. Tabulated values are for maximum bending loads from wind. Loads are limited by bending or shear stress assuming a 2-span continuous condition. For more information, see the ASD Wood Structural Panels Supplement.1051351552653601752052703706803.3 ConnectionsDecember 15, 20013.3.1 ConnectionsConnections resisting induced wind and seismic forcesshall be designed in accordance with methods referencedin 2.1.2.1 for allowable stress design (ASD) and 2.1.2.2for strength design (LRFD).AMERICAN WOOD COUNCIL
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2001 ASD/LRFD Wind/Seismic Supplement - American Wood Council

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