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DERIVATION OF HARDBOARD DESIGN STRESSES
MATERIALS AND CONSTRUCTION OF BEAM
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1/4-inch tempered hardboard 30-specimen least aluminum average beam failure buckling built-up beams Compression parallel curve design load Douglas-fir Duration of stress edgewise shear elastic modulus elastic property values elasticity of hardboard end panels factor of safety Failure load failure pattern Forest Products Laboratory hardboard design stresses hardboard web interlaminar shear least value load duration material measured minor specimens modulus of elasticity modulus of rigidity Moisture content neutral axis normal distribution normal loading parallel to surface plywood Poisson's ratio pounds per square quarter points rH CM rosette analysis sample section properties SHEAR STRENGTH shear stress shown in figure small specimens span due specimens were tested square inch standard deviation standard test statistical analysis stiffeners strain Strength and elastic strength level stress obtained structural component tension and compression tension flange tension parallel thesis transformed area method Transformed section U.S. Forest Prod ultimate stress VQ/It wood flanges