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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。
In order to improve the axial compressive bearing capacity of CFST columns with deformed sections, a steel-concrete composite column with deformed steel bar and a special shaped section is proposed. Considering the influence of the parameters such as the cuff index and the bony rate, 12 types of L-section concrete-filled steel tubular short columns with built-up steel-concrete composite L-section concrete filled steel tube short columns and 3 unconfigured steel columns were designed and manufactured; Axial compression tests were conducted to investigate the failure modes of the specimens, the load-longitudinal strain curves and the bearing capacity of the specimens. The influence of each parameter on the mechanical properties of the specimens was analyzed. On the basis of the experimental study, referring to the relevant norms at home and abroad, the calculation formula of axial compressive bearing capacity of L-section concrete-filled steel tubular short columns with built-in steel plates is proposed. The results show that the bearing capacity of L-section CFST short columns with built-in steel and steel columns is high, and the increase of the index of cuff and the rate of bony bond can obviously improve the bearing capacity of the specimens. The formula of bearing capacity proposed can be used for engineering design reference.