不同约束构造方钢管混凝土柱的轴压特性有限元分析

Finite Element Analysis of Axial Compressive Behavior of Square Concrete-Filled Steel Tube Columns with Various Confinement Constructions

摘要: 为增强外部方钢管对内部核心混凝土的约束能力，减缓在轴压下方钢管的局部屈曲，提出了多种不同的内置约束构造的复合约束方钢管混凝土柱，通过ABAQUS对不同约束构造下的方钢管混凝土柱模型进行模拟。研究其在轴向压力作用下的各项轴压特性，包括承载力、刚度和延性，对比分析其应力云图。研究结果表明：增设不同的约束构造均能提高短柱的承载能力、延性性能和刚度；而设置钢管和型钢对承载能力和刚度的提高效果更为显著，方形构造比圆形构造对混凝土的约束效果更好；增设横向加劲肋对延性的提高更为显著。

Abstract: In order to enhance the restraint ability of the external square steel tube to the internal core concrete and slow down the local buckling of the steel tube under axial compression, a variety of composite confined square CFST columns with different built-in restraint structures were proposed, and the models of the square CFST columns under different constraint structures were simulated by ABAQUS. The axial compressive properties under axial pressure, including bearing capacity, stiffness and ductility, were studied, and the stress contours were compared and analyzed. The results show that the load-bearing capacity, ductility and stiffness of the short column can be improved by adding different restraint structures. However, the improvement effect of steel pipe and section steel on the bearing capacity and stiffness is more significant, and the constraint effect of square structure on concrete is better than that of circular structure. The addition of transverse stiffeners improves ductility more significantly.