墙柱截面特征及轴压比对RC框架和剪力墙抗侧性能影响非线性仿真分析

Nonlinear simulation analysis on the influence of sectional feature and axial compressionratio of wall and column to the lateral resistance of RC frame and shear wall

采用三维实体退化虚拟层合单元非线性有限元分析法,经对一个三跨4层RC框架-剪力墙模型模拟分析并与其试验结果对比验证之后,分别对方形和矩形柱RC框架、3种洞口类型RC剪力墙以及3种轴压比下的RC框架和剪力墙抗侧性能进行了模拟分析,得出方形柱RC框架侧移刚度退化速率较慢,剪力墙侧移刚度退化速率随洞口的减小而加快;RC框架和剪力墙前期侧移刚度随轴压比增大而提高,而其侧移刚度退化速率又随轴压比增大而加快,且轴压比越大侧移刚度退化系数极限值越低等结论。

The nonlinear finite element method based on degenerated three-dimension solid virtual laminated element theory is introduced.The validity and efficiency of the method are proved by analysis and comparison with the test result on a three-span RC frame experiment model which has four stories.RC frames with square columns and rectangular columns,RC shear walls with three types of openings,RC frame and shear wall considering three axial compression ratio were used respectively to make lateral performance simulation analysis.Results show that lateral stiffness degradation rate of RC frames with square columns is slower.And lateral stiffness degradation rate of shear wall accelerates with decrease of wall opening.The lateral stiffness of RC frame and shear wall enlarge with increase of axial compression ratio.The results also show that a greater axial compression ratio leads to faster lateral stiffness degradation rate.In addition,the greater the axial compression ratio of RC frame and shear wall is,the lower the stiffness degradation coefficient limit is.