![]() ![]() ![]() The variation of the circulatory torsional stiffness and warping torsional stiffness over the entire loading process and the impact of warping shear deformation on the torsion-induced rotation of the member are considered in the formulation. ![]() The critical criteria to consider or ignore the shear effects under different boundary conditions were also defined.īased on Vlasov?s torsional theory of open thin-walled members and the nonlinear constitutive relations of materials, a nonlinear analysis model to predict response of open thin-walled RC members subjected to pure torsion is proposed in the current study. It was revealed that stronger boundary constraint and smaller span-depth ratio lead to greater effects of shear deformation, which cannot be neglected. Besides, parametric analysis including different configurations, boundary conditions and span-height ratio were conducted to evaluate the effects of shear deformation on the torsional rotation of OTWMs. Results of average errors 2.90% and 1.77% guaranteed the applicability and accuracy of the proposed method. Two examples (U-beams and I-beams) were taken to be calculated by the proposed method, Vlasov’s theory and finite element analysis. Shear deformation along the middle line of cross section, which is neglected in Vlasov’s theory, was considered and quantified in this paper. The classic torsional theory, Vlasov’s theory, was found to greatly underestimate the torsional rotation especially for OTWMs with lower span-depth ratio or lower shear modulus. When subjected to eccentric lateral or vertical loads, Open Thin-Walled Members (OTWMs) will suffer the risk of torsional failure for their relatively low torsional rigidity. ![]()
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