中文摘要：

为改善圆端形钢管混凝土（CFRT）柱的力学性能,采取在钢管内部焊接拉筋的方式来提高对核心混凝土的约束效果,并采用ABAQUS对4种不同约束方式的圆端形钢管内约束混凝土（SCFRT）轴压短柱进行三维实体有限元分析,发现双向均匀对拉箍筋为最佳约束方式.最后,对2根圆端形钢管混凝土轴压短柱及2根双向均匀对拉约束方式的圆端形拉筋约束混凝土轴压短柱进行了试验研究,结果显示试验结果与数值模拟结果吻合较好,验证了双向均匀对拉约束方式的合理性.

英文摘要：

In order to improve the mechanical properties of confinement concrete-filled round-ended steel tubular（ CFRT） stub columns,this paper adopts the way of welding stirrups to enhance the constraint effect on core concrete. Then,the ABAQUS software is employed to analyze the finite element parameters of the 3D solid of stirrups confinement concrete-filled round-ended steel tubular（ SCFRT） stub columns in four constraint ways,and the way of bidirectional butt joint stirrups is found to be the best. Finally,two sets of CFRT stub columns and two sets of SCFRT stub columns are investigated by experiments. It is found that the experimental results accord well with the simulation ones,which demonstrates that the way of bidirectional butt joint stirrups is rational.