内置钢骨组合L形截面钢管混凝土短柱轴压性能试验研究

为提高异形截面钢管混凝土柱的轴压承载力，提出内置钢骨组合异形截面钢管混凝土柱。考虑套箍指标、配骨率等参数的影响，设计制作12个内置钢骨组合L形截面钢管混凝土短柱及3个未配置钢骨的组合L形截面钢管混凝土短柱两类试件；通过轴心受压试验，考察试件的破坏形态，实测试件的荷载-纵向应变曲线和承载力，分析各参数对试件力学性能的影响，并对比两类组合柱轴压性能的差异。在试验研究基础上，参考国内外相关规范，提出内置钢骨组合L形截面钢管混凝土短柱轴心受压承载力计算式。研究表明，内置钢骨组合L形截面钢管混凝土短柱轴压承载力高，增大套箍指标和配骨率可以明显提高试件承载力，所提出的承载力计算式可供工程设计参考。

Experimental research on axially loaded composite L-section steel tubular short columns filled with steel-reinforced concrete

In order to improve the axial bearing capacity of special shaped concrete-filled steel tubular columns, special-section steel tubular column filled with reinforcing steel is presented in this paper. Considering the reinforcing steel index and confining index, twelve composite L-section steel tubular short columns filled with steel-reinforced concrete and three composite L-section steel tubular short columns filled with concrete only were designed. The failure modes of specimens, load-deformation relationship, ultimate bearing capacity and the influences of reinforcing steel index and confining index on the axial loading behavior, were analyzed and tested. Based on the code provisions of China and other countries, the formula for the calculation of compression bearing capacity of composite L-section steel tubular column filled with steel-reinforced concrete was developed. The test results indicate that the axial bearing capacity of special shaped concrete-filled steel tubular columns is high. The strength and ductility can be improved by increasing the reinforcing steel index and confining index. The proposed formula can be useful for engineering design.