ABAQUS二次开发在钢管混凝土结构有限元分析中的应用

Application of ABAQUS secondary development in finite element analysis of concrete-filled steel tubular structures

本文基于ABAQUS提供的脚本程序接口,利用Python语言开发了钢管混凝土构件参数化建模的脚本程序CFST-3D,提高了钢管混凝土构件的建模效率,为后续的钢管混凝土构件受力分析提供了便捷的建模方法;基于ABAQUS提供的用户自定义材料子程序接口UMAT,采用Fortran语言开发了适用于钢管混凝土中核心混凝土和合理考虑包辛格效应的钢材的单轴滞回本构模型,扩充了ABAQUS中适合三维梁单元的材料库,可进行钢管混凝土结构体系的拟静力和弹塑性动力分析。采用上述所开发的参数化脚本程序以及核心混凝土和钢材的材料单轴滞回本构模型,对已有研究者完成的钢管混凝土构件以及单层钢管混凝土-钢梁平面框架的试验进行力学性能数值模拟,并与试验结果进行对比,验证了本文所开发程序的合理性和有效性。

Based on the script programming interface of ABAQUS,concrete-filled steel tubular(CFST) member parametric modeling script CFST-3D was developed by Python language.The parametric modeling script can improve the efficiency of modeling and provide the convenient parametric analysis on concrete-filled steel tubular members.And the user-defined confined concrete and steel uniaxial hysteretic material constitutive models were developed in subroutine UMAT provided by ABAQUS based on Fortran language,which can be used to analyze the quasi-static and elasto-plastic performance of the concrete-filled steel tubular structures.The steel material model can consider the Bauschinger effect rationally.The parametric modeling script and the user-defined material were verified by comparisons between the previous experimental results and the modeling results.The results show that both of the developed programs are reasonable and effective.