为了对钢管混凝土L形柱的力学性能和工作机理进行分析,将钢管对混凝土不均匀的约束作用简化为侧压相等的约束.考虑截面形状对侧向约束的影响,对Mander约束混凝土本构模型进行修正,建立了核心混凝土的本构关系.应用有限元软件ABAQUS对3个轴压短柱试件进行了模拟分析,并将计算结果与试验结果进行了对比,在此基础上探讨了构件中钢管对混凝土的约束机理.计算结果表明,该本构关系能较好地适用于对钢管混凝土L形柱轴压性能的非线性分析,钢管对混凝土的约束效应主要集中在L形截面阳角处.%In order to analyze the mechanical properties and operating mechanism of the L-shaped concrete filled steel tubular (L-CFST) column, the asymmetric confinement effect of steel tube on concrete was simplified as the isocratic lateral pressure confinement. With considering the influence of section shape on lateral confinement, a constitutive relationship of the core concrete was established through modifying the confined concrete constitutive model proposed by Mander. The simulation analysis for 3 axial compressive stub columns was carried out with finite element software ABAQUS, and the confinement mechanism between steel tube and concrete was subsequently discussed based on the comparison between the calculated results and experimental results. The calculated results show that the suggested constitutive relationship can be well applied in the non-linear analysis of axial compressive properties of L-CFST column. The confinement between steel tubes and concrete mainly distributes at the external corner of L-shaped section.
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