初期不整を有する柱の逆負荷塑性を考慮した座屈後挙動の解析

概要

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The post-buckling behavior of elastic-plastic columns with initial imperfections, i.e., initial deflection and eccentricity of load, is computed numerically using a discrete model composed of rigid bars and nonlinear spring elements. A power type stress-strain relation is combined with the kinematic hardening rule for reversed plasticity, which may appear following elastic unloading. The load-deflection curves are given for pin-ended columns with U-shaped, rectangular or circular cross-sections. It is shown that the maximun load of stocky columns with a small initial imperfection is close to the tangent modulus load. for columns with a large initial imperfection, the reversed plasticity affects the load-carrying capacity a little, because the reversed plastic region is limited within the inside of the cross-section. The relationship between the average buckling stress and the slenderness-ratio depends slightly on the shape of the cross-section.
1986-04-25