基于MSC.MARC的纤维梁子程序开发与验证

Development and Verification of Subroutine of Fiber Beam Element on the Basis of Program MSC.MARC

本文基于MSC.MARC平台开发了纤维梁单元子程序,并对其进行了详细测试。采用MSC.MARC模拟钢筋混凝土梁非线性行为时,需要开发相应的纤维梁单元子程序。基于UBEAM子程序接口,开发了可以考虑剪切变形的两节点单积分点线性Timoshenco梁单元和不考虑剪切变形的两节点三积分点Euler-Bernoulli梁单元子程序,以上两种子程序均包含两种混凝土和两种钢筋单轴本构材料模型。以中国建筑学会抗震防灾分会建筑结构抗倒塌专业委员会开展的钢筋混凝土框架柱拟静力往复试验为例,将数值分析结果与实验结果进行了对比,对编制的子程序进行了详细测试和分析,结果表明:数值模拟可以得到与试验较为一致的结果,编制的子程序是正确的,可进一步用于结构动力弹塑性时程分析和倒塌分析。

Subroutine of fiber beam element on program MSC. MARC is developed and tested in detail. To perform numerical simulation of reinforced concrete beams based on program MSC.MARC,it is necessary to develop the corresponding subroutine of fiber beam element. Using the program interface UBEAM,user subroutines of Timoshenko beam element with transverse shear deformation which has two nodes and a single integration point,and Euler-Bernoulli beam element without considering the shear deformation effect which has two nodes and three integration points are developed,respectively. Both of two types of beam elements include two kinds of different concrete and steel uniaxial constitutive models respectively. Taking a pseudo-static test of reinforced concrete frame column as an example. The test was organized by Tsinghua University and Professional Committee of Collapse-prevention of Building Structure of Association of Earthquake Resistance and Disaster Prevention, Architectural Society of China. Numerical simulation and comparison with measurements are carried out. Detailed verification of the subroutine is conducted. The results show that the data from numerical simulation and test are consistent with each other comparatively,and the user subroutines are correct,which can be applied in elasto-plastic dynamic response time history analysis and progressive-collapse analysis of structure.