自复位钢管混凝土桥墩力学性能研究

Research on mechanical performance of self-centering concrete-filled steel tube pier

为探究自复位钢管混凝土桥墩的力学性能,通过改变桥墩轴压比、施加预应力大小和耗能钢筋配筋率,建立了18个具有自复位功能的钢管混凝土桥墩有限元模型,并进行弹塑性分析,考察了该型桥墩的最大水平承载力、耗能能力和恢复能力。结果表明:自复位钢管混凝土桥墩在承载能力达到同尺寸部分填充钢管混凝土桥墩同等水平的同时,可以大幅度降低桥墩的残余位移,且耗能能力不低于部分填充钢管混凝土桥墩的40%。

In order to explore the mechanical properties of self-centering concrete-filled steel tube piers,18 finite element models of concrete-filled steel tube piers with self-centering function were established by changing the pier axial compression ratio,the amount of prestress applied,and the ratio of energy-dissipating steel reinforcement.Analysis and investigation of the maximum horizontal bearing capacity,energy dissipation capacity and recovery capacity of this type of bridge pier.The results show that the self-centering concrete-filled steel tube pier can greatly reduce the residual displacement of the pier while its bearing capacity reaches the same level as that of the partially concrete-filled steel tube pier,and its energy consumption capacity is not less than 40%of that of the partially concrete-filled steel tube pier.