不同约束构造圆钢管混凝土柱的轴压特性有限元分析

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

摘要: 为研究具有不同约束效应的圆钢管混凝土轴压特性及其约束机制，采用有限元软件ABAQUS对五个不同约束构造下的圆钢管混凝土模型进行模拟，包括不设约束构造、纵向加劲肋、方钢管、钢筋笼和型钢。研究其在轴向压力作用下的承载能力、延性、刚度退化、以及应力云图的特点和差异。研究结果表明：增设纵向加劲肋、方钢管、钢筋笼和型钢均能提高短柱的承载能力、延性性能和刚度;而设置方钢管和型钢对承载能力和刚度的提高效果更为显著；增设方钢管对延性和的提高更为显著。

Abstract: In order to study the axial compressive behavior of circular concrete-filled steel tube columns with different confinement constructions and its confinement mechanism, the finite element software ABAQUS was used to simulate the models with different confinement constructions of circular concrete-filled steel tube columns, including no restraint structure, longitudinal stiffener, square steel tube, steel reinforcement cage, and shape steel. The study investigates the bearing capacity and ductility performance under axial compressive load and analyzes the characteristics and differences of the stress cloud maps among five models. The research results show that the addition of longitudinal stiffener, square steel tube, steel reinforcement cage, and shape steel can improve the bearing capacity, ductility and stiffness of short columns; however, the improvement in bearing capacity and stiffness is more significant for the addition of square steel tube and shape steel; the improvement in ductility is more significant for the addition of square steel tube.