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对局部受压下的中空夹层钢管混凝土进行试验研究。分别对含内外两层钢管的14个圆形构件和15个方形试件进行试验,试验参数包含:空心率、顶端板厚度、局压面积比。结果表明:局部受压下中空夹层钢管混凝土呈现延性。各试验参数对局部受压中空夹层钢管混凝土短柱的性能和破坏模型有很大影响。最后,提出分析局部受压下中空夹层钢管混凝土承载力的简化计算模型。
Experimental study on hollow concrete filled steel tube under local compression. Fourteen circular members and fifteen square specimens with inner and outer two layers of steel tubes were tested respectively. The parameters of the test include hollowness, top plate thickness and area pressure ratio. The results show that the hollow concrete-filled CFST under local compression presents ductility. Each test parameter has great influence on the performance and failure model of partially compressed hollow concrete-filled CFST short columns. Finally, a simplified calculation model is proposed to analyze the bearing capacity of hollow-walled CFST under local compression.