反复荷载下钢筋混凝土平面应力问题有限元非线性分析

本文采用有限元法，对承受反复荷载的钢筋混凝土构件的平面应力问题进行了非线性分析，提出了较为合理的材料本构模型。其中，对开裂后的混凝土考虑了裂面接触效应。本文采用了建立在等效单轴应变概念基础上的增量式正交异性模型来描述混凝土的双向受力性能，并对该模型中的主轴旋转规则进行了改善。采用以本文所述方法编制的程序进行了实例分析，分析结果与试验结果吻合良好。

Nonlinear Analysis of R.C.Plane Stress Member Subjected to Cyclic Loading

In this paper a nonlinear analysis based on finite element method for cyclic loading response of planar reinforced concrete structures is described.A resonable model for reinforced concrete is developed which includs a stress strain law for cyclically loaded reinforcement,a nonlinear orthotropic stress strain law for biaxially loaded plain concrete which takes into account the load contact effects of cracked section,and a bond,slip relationship between concrete and reinforcements.A modified orthotropic model is applied to describe the biaxially loaded behavior of concrete.The proposed model is incorporated into a finite element computer program which can be applied to nonlinear analysis for monotonic,repeated and reversed loading response of planar reinforced concrete structures.In a given example,pridictions from the proposed procedure are compared with experiment results and excellent coincidence is achievd