2001 ASD Supplements - unprotected PDF - American Wood Council

ASD WOOD STRUCTURAL PANEL SHEAR WALL AND DIAPHRAGM SUPPLEMENTSW-11Table 3.1B Recommended Shear (pounds per foot) For Horizontal WoodStructural Panel Diaphragms with Framing of Douglas fir-Larch orSouthern Pine a for Seismic LoadingPanelGradeStructural IGradesSheathing,Single-Floor andotherstructuralusepanelgradesCommonNail SizeMinimumNailPenetrationin Framing(in.)MinimumNominalPanelThickness(in.)6d e 1-1/4 5/168d 1-3/8 3/810d d 1-1/2 15/326d e 1-1/4 5/168d 1-3/8aFor framing of other species: (1) Find specific gravity for species offraming lumber in the NDS.(2) Find shear value from table above for nail size of actual grade.(3) Multiply value by the following adjustment factor = [1 - (0.5 - G)],where G = specific gravity of the framing lumber. This adjustment factorshall not be greater than 1.bSpace nails maximum 12 in. o.c. along intermediate framing members (6in. o.c. when supports are spaced 48 in. o.c.).cFraming at adjoining panel edges shall be 3 in. nominal or wider, andnails shall be staggered where nails are spaced 2 in. o.c. or 2-1/2 in. o.c.3/83/87/1615/3210d d 1-1/2 15/3219/32SEISMIC LOADINGBlocked DiaphragmsNail Spacing (in.) atdiaphragm boundaries (all cases),at continuous panel edges parallelto load (Cases 3 & 4), and atall panel edges (Cases 5 & 6) b6 4 2-1/2 c 2 cMinimumNominal Width Nail Spacing (in.) atof Framingother panel edgesMember(Cases 1, 2, 3 & 4) b(in.) 6 6 4 32185 250 375 4203210 280 420 4752270 360 530 6003300 400 600 6752320 425 640 7303360 480 720 8202170 225 335 3803190 250 380 4302185 250 375 4203210 280 420 4752240 320 480 5453270 360 540 6102255 340 505 5753285 380 570 6452270 360 530 6003300 400 600 6752290 385 575 6553325 430 650 7352320 425 640 7303360 480 720 820deUnblocked DiaphragmsNails Spaced 6 in. max. atSupported Edges bCase 1 (NoUnblocked edgesor continuousjoints parallelto load)165185240265285320150170165185215240230255240265255290285320All otherconfigurations(Cases 2, 3,4, 5 & 6)125140180200215240110125125140160180170190180200190215215240Framing at adjoining panel edges shall be 3-in. nominal or wider, andnails shall be staggered where 10d nails having penetration into framingof more than 1-5/8 in. are spaced 3 in. o.c.8d is recommended minimum for roofs due to negative pressures of highwinds.Notes: Design for diaphragm stresses depends on direction of continuouspanel joints with reference to load, not on direction of long dimension ofsheet. Continuous framing may be in either direction for blockeddiaphragms3DIAPHRAGMSLoadCase 1FramingLoadCase 2Blocking,if usedLoadCase 3Continuous panel jointCase 4LoadBlocking,if usedDiaphragm boundaryCase 5LoadBlocking,if usedLoadCase 6FramingContinuous panel jointAPA – The Engineered Wood AssociationContinuous panel joint