用于ABAQUS显式分析梁单元的混凝土单轴本构模型

摘要

目的 为实现采用梁单元进行钢筋混凝土杆系结构的弹塑性响应分析,对其混凝土本构关系进行二次开发,使ABAQUS软件提供的混凝土材料模型能用于三维梁单元.方法 利用ABAQUS用户自定义材料程序VUMAT接口,开发用于显式动力分析的梁单元混凝土单轴本构模型,并编制相应的计算程序,对低周往复加载下的钢筋混凝土柱进行数值模拟计算.结果 数值模拟结果能够较好地反映轴力对钢筋混凝土构件滞回性能的影响以及钢筋混凝土柱的双向弯曲耦合性能.结论 笔者所开发的混凝土本构模型能够用于多维受力状态下钢筋混凝土梁柱构件的受力行为分析,满足钢筋混凝土杆系结构动力弹塑性分析的需求.%In order to use the beam element of FEM software ABAQUS for analyzing the elastic-plastic dynamic response of RC truss structures, it is necessary to carry out a secondary development of the concrete constitutive for spatial beam element. In this paper,a uniaxial constitutive model of concrete is established. The material subroutine of this model is successfully developed and applied to explicit dynamic module of ABAQUS by means of user-defined subroutine interface VUMAT. Afterwards,the hysteretic performance of RC columns under cyclic loading is numerically simulated and compared with experiment results. The results show that the uniaxial constitutive model can rightly simulate the influence on the hysteretic performance of RC columns under varies axial load,as well as the bi-axes bending coupling performance. The established model can meet the demand of analyzing the elastic-plastic dynamic response of RC frame structures.