混凝土本构关系对抗震性能评估影响研究

Study on Effect of Assessment of Seismic Performance Affected by Concrete Material Constitutive Relationships

为了研究混凝土本构关系对抗震性能评估的影响,运用目前已广泛应用于结构抗震性能评估的结构分析软件SAP2000,选用及比较了我国规范以及美国规范建议采用混凝土材料本构关系和SAP2000中默认的混凝土材料本构关系,分别采用集中塑性铰模型和截面纤维单元模型对比分析一幢六层RC平面框架结构构件弯矩-曲率关系和对该框架结构进行抗震性能评估。研究表明:在不同计算理论模型下,采用上述三种混凝土材料本构关系分析得到构件弯矩曲率关系和结构能力曲线差值范围都在15%以内,在具体工程结构抗震性能评估时,可直接选用SAP2000默认混凝土材料本构关系,提高结构计算收敛性和抗震性能评估效率。

In order to study how concrete material constitutive relationships affected assessment of structure seismic performance structures,the concrete material constitutive relationships recommend by American and Chinese Codes and the relationship defaulted in SAP2000 were choose and compared among them,and one six-story RC frame structure was selected and the analysis about the moment-curvature relationship of reinforced concrete members and the over-all seismic performance of RC frame structure were done by using the lumped plastic hinge model and the section fiber model.The study shows that three kinds of concrete material constitutive relationships have a limited effect on analysis results with the difference value of 15%.The conclusions may be referred for the choice of the concrete material constitutive relationship in practice,and the convergence and the efficiency of analysis are improved.