钢管混凝土框架结构抗震性能的非线性有限元分析*
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(1天津大学建筑工程学院 300072；2江汉石油学院土建系荆州 434023）
［提要］ 基于一榀两跨3层钢管混凝土框架的抗震性能模型试验，建立了基于钢管混凝土统一模量理论的钢管混凝土以及考虑钢管约束效应的核心混凝土的本构方程。分别按照钢管混凝土的统一模量理论和分离模量理论，采用ANSYS参数化程序设计语言（APDL）编制了命令流，对模型框架在低周反复荷载作用下的抗震性能进行了非线性有限元分析。计算结果与模型试验结果吻合较好，验证了基于统一模量理论的钢管混凝土框架结构全过程分析方法的可行性，以及所编制的APDL命令流程序对钢管混凝土框架结构抗震计算的有效性，为钢管混凝土框架结构的抗震设计提供了实用的计算软件。［关键词］ 钢管混凝土;框架结构;抗震性能;非线性有限元分析;统一模量;分离模量Abstract: Based on the model experiment on seismic behavior of a 2-span，3-story concrete filled steel tubular(CFST)frame under lateral cyclic loads，the constitutive equations of the CFST in terms of the uniform modulus theory and the constitutive equations of the core concrete considering the restraint effect of steel tube are built．A command stream is edited with the ANSYS Parametric Design Language(APDI)，and the nonlinear finite element analysis on the seismic behavior of the model frame under lateral cyclic loads is completed．The calculated results are much coincided with the tested results，which further proves the rationality of the design method of the CFST frames，based on the uniform modulus theory of CFST，and the effectiveness of the computer program of APDI．Command stream for seismic calculation of CFST frames，and provides a practical software for seismic design of CFST frames．Keywords：Concrete-filled steel tubular (CFST) frame; seismic behavior; nonlinear finite element analysis; uniform modulus; separated modulus
