反复荷载下钢筋混凝土构件的非线性有限元分析

NONLINEAR FINITE ELEMENT ANALYSIS OF RG MEMBERS UNDER REVERSED CYCLIC LOADING

本文论述了反复荷载下钢筋混凝土构件的非线性有限元方法.混凝土采用基于等效单轴应变的增量式正交异性分析模型,及考虑裂面效应的反复加载本构关系.钢筋的应力应变关系中考虑了反复荷载下的Baushinger效应.在粘结滑移模型中引用了作者提出的一种新的粘结单元和反复荷载下的粘结-滑移关系.应用所编制的二维非线性有限元程序,作者对反复周期加载的轴心受力试件及压弯构件进行了分析,计算的滞回曲线与实测结果符合良好.

In this paper, a nonlinear finite element analysis of RC members under reversed cyclic loading is studied. The incremental orthotropic model based on equivalent uniaxial strain and the constitutive relation under cyclic loading in consideration of the effect of cracked section for modelling of concrete are used. In the stress-strain relationship of steel, the Baushinger effect is considered. A new bond element and the r-S relationship under reversed cyclic loading proposed by the author are adopted. A two dimensional finite element program has been developed for analyzing RC uniaxial specimens and RC members with flex-ural and axial force under cyclic loading. The calculated and measured hysteresis loop are shown to be in good agreement.