Nonlinear Inelastic Analysis of Steel Beam-Columns-Theory

摘要

The paper presents a nonlinear inelastic analysis of the biaxial bending and torsion of thin-walled steel beam-columns which is based on the principle of virtual work. The effect of geometric nonlinearity is developed using position vector analysis. Approximations are not made in the early stage of the development, and thus some significant terms for buckling and postbuckling analysis are retained. The von Mises yield criterion, the associated flow rule and the hardening rule are employed in formulating the elastic-plastic constitutive matrix for the material inelasticity. Inelastic uniform and non-uniform torsion are incorporated in the formulation as well as the linear and nonlinear geometric effects of the loads.