Study on Bending Stress of Back-to-Back Channel Steel Composite Beam Under Uniform Load
The bending stress distribution of cold-formed thin-walled back-to-back composite beam under uniform load is studied.Based on the classical bending-torsion theory and the restraint-torsion theory of beam,the theoretical formula for bending stress distribution of members under uniform load is deduced with considering warpage effect,and analysis of the example by finite element software ABAQUS.The results of finite element analysis and theoretical calculation are compared,and the rationality of the theoretical formula is verified.The results show that the bending stress presents a linear gradient distribution on the cross section.For example,for member OT1.2-86-S75,when the rotational restraint values are 10,100 and 1000 N respectively,the stress gradients at the flange are 3.225,2.465 and 1.732 MPa/mm,which means that the stress gradient at the flange increases with the decrease of rotational restraint.Continuous parabolic distribution along the longitudinal direction between adjacent screws;if the screw spacing is equal,the maximum bending stress occurs in the mid-span and local maximum bending stress decreases gradually towards the support.
cold-formed crimped channel steelback-to-back composite beamuniform loadfinite element analysis
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