内配型钢的圆钢管混凝土轴压短柱力学性能分析

Analytical Behavior of Concrete-filled Steel Tubular Stub Column with Interal Steel Reinforced under Axial Compression

在钢管混凝土构件内部配置型钢可显著提高其受力特性。在合理选取材料本构模型的基础上,基于ABAQUS软件建立了内配型钢圆形钢管混凝土短柱荷载-变形全过程分析的数值模型,并与其他研究者完成的相关试验构件结果进行了对比,总体上数值计算结果和试验结果吻合良好。基于此模型,对其在轴压荷载受力全过程、典型破坏形态以及各部件的荷载分配进行了较全面分析。结果表明:内部型钢的存在可显著提高构件承载力,并有效增强核心混凝土的被动约束效应;型钢截面形式不同,对内部混凝土的约束效果不同,从而引起核心混凝土的应力分布有所不同。本文分析结果可进一步完善内配型钢的圆钢管混凝土构件力学性能的理论研究,也可为相关工程应用提供参考。

The internal profile steel can obviously improve the mechanical behavior of the concrete-filled steel tubular（CFST） members.In this paper,a numerical model is presented to investigate the mechanical behavior of axial compression of the circular CFST stub column with internal profiled steel using ABAQUS based on reasonable constitutive models of steel and concrete.The numerical results are compared with the other researchers＇ experimental results,and they match well with each others.Based on the model,the whole stage of axial compressive load of the stub columns,typical failure models and load distribution of different components of the columns are calculated and analyzed.The results show that the ultimate strength of this type of CFST columns will be improved effectively due to the internal profile steel.The confined effect of core concrete also is enhanced by the profiled steel,and the confined effect and stress distribution of core concrete will slightly differ from different steel sections.The results are referred to further research of this type of composite column,and also useful to the practical engineerings.