中文摘要：

针对钢管混凝土中的核心混凝土，采用现有的核心混凝土单轴受压本构关系及《混凝土结构设计规范》（GB50010--2010）中给出的滞回规则，利用大型通用有限元分析软件ABAQUS提供的二次开发平台，开发了核心混凝土用户材料子程序UMAT，并分别在材料、构件及结构层次上进行了验证。结果表明，采用所开发的核心混凝土用户材料子程序在总体上能较好地模拟钢管混凝土结构或构件的力学性能，且具有较高的分析效率。

英文摘要：

Based on the existing uniaxial compressive constitutive relationship of concrete confined by the steel tube and the concrete hysteresis rules specified in ＂Code for design of concrete structure （GB50010-- 2010） ＂, a user material subroutine, UMAT, for concrete confined by the steel tube was developed in the general finite element software ABAQUS. The user material subroutine was validated on the material, structural member and structural system levels, respectively. The results show that the user material subroutine developed in this paper can be used to simulate the mechanical behaviors of concrete filled steel tubular （CFST） with relatively high efficiency.