基于规范的混凝土单轴循环本构模型的开发

Development of uniaxial cyclic constitutive model for concrete based on Chinese concrete code

将《混凝土结构设计规范》(GB 50010—2010)中建议的混凝土单轴应力—应变曲线作为骨架曲线与Yassin提出的滞回规则相结合,从而组成了一个能适用于钢筋混凝土结构在地震等反复荷载作用下非线性分析的循环本构模型。以大型通用有限元软件ABAQUS为分析平台,通过软件提供的用户材料子程序二次开发接口VUMAT嵌入到ABAQUS中。验证了模型在多种典型工况下的性能,并对一钢筋混凝土四层平面框架结构在地震作用下的损伤演化过程进行了模拟分析。结果表明:给出的混凝土单轴循环模型适用于钢筋混凝土结构的弹塑性地震响应分析。

The uniaxial envelope curves of concrete suggested in Code for design of concrete structures( GB 50010—2010) were combined with the hysteretic rules by Yassin. The cyclic constitutive model for concrete was aimed at the nonlinear analysis of the reinforced concrete( RC) structures under strong earthquake. The model was implemented into generalpurpose FEA software ABAQUS through the user material subroutine VUMAT. Then,some typical performances of the presented model are verified. And a seismic inelastic analysis of a multi-storey RC frame structure was conducted using the cyclic model as well. The results show that the constitutive model was suitable for the seismic analysis of RC structures.