不同截面形式的低配筋桥墩的抗震性能分析

Seismic Performance Analysis of Low Reinforced Piers with Different Section Shapes

针对矩形截面、圆形截面和圆端形截面三种不同截面形式的铁路桥墩,采用ANSYS软件对其建立了滞回分析模型,并对这三种截面桥墩的抗震性能进行了研究,分析了不同截面形式下桥墩的位移延性系数、刚度退化和耗能能力.结果表明:三种截面形式的桥墩,圆端形截面桥墩的位移延性系数和极限位移最大,表现出较好的延性性能;桥墩最终破坏时,圆端形截面桥墩的刚度退化速率最慢,累积耗能最大.在轴压比、剪跨比、配筋率和配箍率均相同情况下,圆端形截面桥墩有较好的延性性能、刚度退化速率最慢、累积耗能最多,建议在地震区采用圆端形截面桥墩.

The hysteretic analysis models of three kinds of railway piers with different cross-section:rectangular,round and round-end are established by using ANSYS software,and the seismic performance is studied.The displacement ductility coefficient,stiffness degradation and energy dissipation capacity of pier under different sections are analyzed.The results show that the displacement ductility coefficient of rectangular section pier is the largest,and the limit displacement of round ended cross-section pier is the largest among these three different cross-section piers,which shows a better ductility performance than the other two kinds of pier.During the failure stage,the stiffness degradation rate of round ended cross-section pier is the slowest and the accumulated energy consumption is also the largest.In the case of the same axial compression ratio,shear span ratio,reinforcement ratio and hoop ratio,the round ended cross-section pier has better ductility,slower the stiffness degradation rate,and more accumulated energy consumption.So it is suggested to use the round ended cross-section pier in the seismic area.