框填结构等效斜压杆的模型改进及其数值模拟

等效斜压杆理论是模拟混凝土框架填充墙的常用方法之一．为探索该理论在结构抗震动力时程分析模拟中的应用，基于有限元软件ABAQUS，针对某一多层框架砌体填充墙结构案例，建立梁杆单元模型．模型中运用改进后的等效斜压杆宽度计算公式，来定义交叉杆的截面属性，并通过子程序建立材料的非线性本构关系．通过该模型系统分析了其在地震作用下的动力时程响应，并进行了比较研究．计算结果表明，使用等效斜压杆理论对实际框架填充墙进行模拟是可靠的，可以为工程设计提供参考依据．

Modified Model and Numerical Simulation of Equivalent Diagonal Strut for the Infilled RC Frame

Equivalent diagonal strut theory is one of the commonly used methods that are applied to simulate the masonry wall-infilled reinforced concrete (RC) frame. In order to explore the theory application in numerical simulation of actual structures, the finite element analysis software ABAQUS was employed to study the response of one actual case under the action of earthquake. The improved width formula of equivalent diagonal strut was incorporated in the model, and the nonlinear constitutive relation of material was established through the subroutines. The results show that the modified model using equivalent diagonal strut theory to simulate actual infilled RC frame structure is reasonable and feasible, which can provide a reference for the design of engineering structure.