圆端形钢管混凝土柱偏压力学性能研究

采用ABAQUS有限元软件对圆端形钢管混凝土压弯构件进行工作机理及参数分析,研究结果表明:在偏压状态下,圆端形钢管混凝土具有较高的承载力和较好的延性;钢管能对核心混凝土提供有效的约束,约束效果主要集中在圆弧段;圆端形钢管混凝土偏压承载力随着钢管强度、含钢率的提高而提高;随着核心混凝土强度提高,构件承载力增大,延性降低;随着长细比增大,构件承载力降低;截面高宽比对构件偏压承载力影响较小,随着截面高宽比增大,构件延性有降低的趋势.

Mechanical behavior of round-end concrete-filled steel tubular columns under eccentric load

Based on the finite element software ABAQUS , the mechanism and parameter analysis of round-end concrete filled steel tubular columns were carried out. The research results show that, the round-end concrete filled steel tubular columns have high bearing capacity and good ductility under eccentric load. The steel tube can provide effective confinement to core concrete, and the confinement effect is mainly concentrated in the circular section.The bearing capacity increased with the increasing of the strength of the steel tube or the steel contains ratio. As the strength of core concrete increasing, the bearing capacity was improved and ductility decreased. With slenderness ratio increasing, the bearing capacity was decreased. Height to width ratio has moderate effect on the eccentric bearing capacity of columns, the ductility of columns reduced with the increasing of height to width ratio.