考虑温度影响的混凝土弹塑性本构模型

摘要

An elasto-plastic constitutive model for concrete subjected to high temperatures is presented,based on the elasto-plastic theo-ry,to describe the mechanical behavior of concrete under different temperature conditions.Used the user material subroutine UMAT pro-vided by the general software ABAQUS,the elasto-plastic constitutive model is completed.The constitutive model is calibrated with exper-imental results of uniaxial compression tests and biaxial compression tests.It can be proved that the elasto-plastic constitutive model pre-sented can describe the mechanical properties of concrete under different temperatures accurately.%基于弹塑性理论建立了能够考虑温度影响的混凝土弹塑性本构模型,用以描述混凝土在不同温度条件下的力学性能.基于ABAQUS软件平台中的用户材料子程序(UMAT)进行二次开发,完成了该模型的程序实现.通过针对混凝土单元的单轴压缩和双轴压缩的数值试验对该模型进行验证.研究结果表明:建立的弹塑性本构模型能够有效的反映不同温度条件下混凝土材料的力学性能.