2001 ASD Supplements - unprotected PDF - American Wood Council

ASD WOOD STRUCTURAL PANELS SUPPLEMENTSP-11Tension (F tA)Allowable tension capacities listed in Table 3.2 arebased on testing according to the principles of ASTMD3500 Method B. Tension capacity is given as F t A. TheF t is the allowable tensile stress of the material and A isthe area of the cross section. The units of F t A are lb. perfoot of panel width.Compression (F cA)Figure 3.3 Structural panel with axialcompression load in theplane of the panel.3Allowable compression capacities listed in Table 3.2are based on testing according to the principles of ASTMD3501 Method B. Compressive properties are generallyinfluenced by buckling; however, this effect was eliminatedby restraining edges of specimens during testing.Compression capacity is given as F c A. The F c is the allowablecompression stress of the material and A is thearea of the cross section. The units of F c A are lb. per footof panel width.DESIGN CAPACITIES3.4 Shear CapacitiesShear in the Plane (Rolling Shear)(F s[Ib/Q])Allowable shear in the plane of the panel (rolling shear)listed in Table 3.3 are based on testing according to theprinciples of ASTM D2718. Shear strength in the plane ofthe panel is the capacity to resist horizontal shear breakingloads when loads are applied or developed on opposite facesof the panel, as in flat panel bending. Planar shear capacityis given as F s [Ib/Q]. The F s is the allowable material stressand Ib/Q is the panel cross sectional shear constant. Theunits of F s [Ib/Q] are lb. per foot of panel width.Rigidity Through the Thickness(G vt v)Panel rigidity listed in Table 3.4 are based on testingaccording to the principles of ASTM D2719 Method C.Panel rigidity is the capacity to resist deformation undershear-through-the-thickness stress. Rigidity is representedas G v t v , where G v is the modulus of rigidity and t v is theeffective panel thickness for shear. The units of G v t v arelb. per inch of panel depth (for vertical applications). Multiplicationof G v t v by panel depth gives GA, used bydesigners for some applications.Figure 3.4 Two types of panel shear:shear-through-thethicknessand shear-inthe-planeof the panelcalled rolling shear inplywood.APA – The Engineered Wood Association