用于剪力墙滞回性能分析的材料本构模型研究

Study of Material Constitutive Model for Shear Wall Hysteretic Behavior Analysis

目的提出适用于ABAQUS的混凝土本构计算方法,解决现有材料本构模型不能准确模拟地震作用下钢筋混凝土剪力墙的滞回性能的问题.方法基于《混凝土结构设计规范》附录C混凝土应力-应变曲线,提出适用于ABAQUS的混凝土本构模型;采用钢筋单轴本构模型合理考虑了Bauschinger效应,利用ABAQUS用户子程序接口VUMAT进行二次开发,编制了用于显式动力分析的钢筋本构模型的计算程序,并采用分层壳单元对往复荷载下钢筋混凝土剪力墙滞回性能进行数值模拟.结果通过实验对比,验证了采用笔者采用的混凝土和钢筋本构模型能够较好地反映钢筋混凝土剪力墙在低周往复荷载作用下的滞回性能.结论数值模拟结果与试验结果吻合良好,笔者采用的材料本构模型能够较好地模拟钢筋混凝土剪力墙的滞回性能.

The purpose is to solve the problem that the existing material constitutive model can not accurately simulate the hysteresis performance of RC shear wall under earthquake action. In this paper,a constitutive method of concrete for ABAUQS is proposed based on stress-strain curve in appendix C of Code for Concrete Structures Design and the uniaxial steel is established in order to precisely simulate the hysteretic performance of reinforced concrete shear wall under seismic loads. Bauschinger effect is also considered in the uniaxial constitutive model of steel. The material subroutines of these models are simultaneously developed and applied to the explicit dynamic module of ABAQUS by means of user-defined subroutine interface（VUMAT）. In addition,a layered shell element is used to simulate the hysteretic behavior of reinforced concrete shear walls under cyclic loading. Compared with the experimental results,it is proved that the constitutive model of concrete and steel presented in this paper can reflect the hysteretic behavior of reinforced concreteshear wall under lowcyclic loading. The numerical simulation results are in good agreement with the experimental results. The material constitutive model adopted in this paper can simulate the hysteretic behavior of reinforced concrete shear wall.