逆負荷塑性を考慮した柱の塑性座屈後挙動の解析

概要

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Inelastic post^buckling behavior of perfect columns is numerically analyzed by taking account of the reversed plasticity which may appear in the convex side of the column following elastic unloading. A numerical method analyzing post-buckling behavior is developed for a discrete column model composed of rigid bars and nonlinear spring elements. A power type stress-strain relation is assumed for the column and it is associated with three types of unloading and/or reversed loading material response,i.e., the perfectly elastic unloading, isotropic and kinematic hardening rule. The load-deflection curves in the post-buckling range are calculated for pin-ended perfect columns with an asymmetric cross section. It is shown that the reversed plasticity affect a little the maximum load but it lowers significantly the load-carrying capacity after the maximum load.
1985-02-25