中文摘要：

为研究核心钢管混凝土（CSTRC）短柱轴压受力机理及设计方法,完成了7个CSTRC柱和2个RC柱的轴压试验,采用有限元软件ABAQUS对CSTRC柱轴压全过程进行数值仿真。在试验验证的基础上,利用有限元模型研究了CSTRC柱的轴压机理和轴力分配规律。研究表明,核心钢管混凝土柱试件中,钢管对内部混凝土的约束作用明显,钢管外部混凝土对钢管的约束作用可以忽略,其承载力可按RC部分与钢管混凝土柱部分承载力进行线性叠加。根据有限元分析结果,提出了CSTRC柱中钢管混凝土部分的承载力发挥系数。本文成果可为CSTRC结构的设计和应用提供参考。

英文摘要：

Seven core steel tubular reinforced concrete （CSTRC） short columns and two reinforced concrete （RC） columns were tested under monotonic axial loading to investigate the axial compression mechanism and design method of CSTRC columns. A numerical simulation of CSTRC columns was carried out using the finite element softwareABAQUS. The calculated results showed good agreement with the test results, further study on the axial compression mechanism and load distribution of CSTRC columns was conducted on the basis of the finite element analysis. The research showed that the confinement to the concrete inside the steel tubular was significant, while the confinement provided by the core circular steel-tubular to the concrete outside the steel tubular could be neglected. The ultimate compressive bearing capacity of the core circular steel-tubular reinforced concrete column could be obtained by the linear superposition of the RC part and the core steel tubular concrete part. A mobilization factor of the core steel tuhular concrete in the core circular steel-tubular reinforced concrete column is proposed. The results can provide a reference for the structural design and application of CSTRC columns.