圆端形钢管混凝土轴压短柱的机理分析
Mechanism analysis on concrete-filled round-end steel tubular stub columns under axial load

基于有限元软件ABAQUS对圆端形钢管混凝土轴压短柱进行分析. 分析表明：圆端形钢管对核心混凝土的约束效果介于圆钢管和矩形钢管之间；钢管对核心混凝土的约束作用主要分布于圆弧段；圆端形钢管混凝土柱的承载力、峰值应变和延性均介于圆钢管混凝土柱和矩形钢管混凝土柱之间；圆端形钢管混凝土构件承载力和延性随着钢管强度、含钢率、加劲肋厚度和加劲肋数量的提高而提高；随着混凝土强度的提高，其承载力提高但延性下降.
The analysis on concrete-filled round-end steel tubular (CFREST) stub column under axial compression were carried out using finite element software ABAQUS. The analysis results indicate that：the confinement effect provided by the round-end steel tube is between those provided by circular and rectangular steel tubes. The confinement effect provided by the round-end steel tube on the core concrete is mainly distributed in arc segment. The strength，peak strain and ductility of the CFREST column are between those of the CFST column with circular and rectangular cross-sections. For CFREST columns，the strength and ductility increase with the increasing of the steel strength，steel ratio，stiffener thickness and the number of stiffeners. As the concrete strength increases，the strength increases but the ductility drops