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以长细比、空心率和轴压比为变化参数,对7根方中空夹层钢管混凝土和1根方实心钢管混凝土压扭构件进行试验研究。试验结果表明:所有试件表现出良好的延性,夹层混凝土出现约45°的斜裂缝,混凝土未破碎;当轴压比较小(n≤0.3)时,轴压比越大,抗扭承载力越大;当轴压比较大(n>0.3)时,轴压比越大,抗扭承载力越小。采用有限元方法对试件的扭矩-转角关系曲线进行模拟,两者符合良好。
Based on the slenderness ratio, hollow ratio and axial compression ratio, seven square concrete filled CFST and one square concrete filled CFST were tested. The test results show that all the specimens show good ductility, the diagonal cracks appear in the sandwich concrete about 45 °, and the concrete is not broken. When the axial compression ratio is small (n≤0.3), the greater the axial compression ratio is, the more torsional bearing capacity When the axial compression ratio is large (n> 0.3), the greater the axial compression ratio, the smaller the torsional load capacity. The finite element method was used to simulate the torque-angle curve of the specimen, which was in good agreement.