【摘要】 为研究复式薄壁方钢管混凝土短柱的轴压力学性能，设计制作3根不同加劲肋形式的复式薄壁方钢管混凝土短柱试件，对其进行轴压试验和数值模拟，并在此基础上，利用Abaqus软件对其进行参数分析﹒研究结果表明：加劲肋的设置可以有效延缓钢管的局部屈曲、改善试件的延性；相对于无加劲肋的试件，加肋试件的极限承载力提高25%左右；多腔体结构相对于普通带肋形式具有更好的延性；夹层混凝土强度的提高可以明显提高试件整体的极限承载力，夹层混凝土强度每提高20 MPa，试件极限承载力提高约17%；钢材强度的改变对试件极限承载力的影响相对于混凝土强度的改变对试件极限承载力的影响较小﹒更多还原

【Abstract】 In order to study the axial compression performance of the composite thin-walled concrete-filled square steel tubular(CFST) short columns, three specimens of the composite thin-walled CFST short column with different stiffener were designed and fabricated, and the axial compression tests and numerical simulation were carried out. On this basis, the parameters were analyzed by Abaqus software. The results show that the setting of the stiffener can effectively delay the local buckling of the steel pipes and improve the ductility of the specimen; compared with the specimen without the stiffener, the ultimate bearing capacity of ribbed specimens is increased by about 25%; the multi-cavity structure has better ductility than the ordinary ribbed form. The improvement of the strength of the sandwich concrete can significantly improve the overall ultimate bearing capacity of the specimen. When the strength of sandwich concrete increases by 20MPa, the ultimate bearing capacity of the specimen increases by about 17%. The influence of the change of steel strength on the ultimate bearing capacity of the specimen is less than that of the change of concrete strength.更多还原