内置T型钢板补强圆形钢桥墩抗震性能研究

Study on Seismic Performance of Circular Steel Bridge Piers with T-Reinforcing Rib

目的研究不同数量的内置补强T型肋和用钢量对圆形钢桥墩的极限强度、延性等抗震性能的影响.方法在确定实验数据与数值分析基本吻合的前提下,使用Abaqus有限元程序对5个内置T型肋补强圆形钢桥墩进行了非线性弹塑性数值分析.结果各补强钢桥墩的屈服位移和最大位移大致相同,但各补强钢桥墩的强度退化的速度有明显区别.从不同定义的延性曲线上得到4T和8T类型补强肋的桥墩延性最优.若考虑用钢量等经济因素4T用钢量为8T一半却拥有相近的延性.结论随着补强肋数的增加,钢桥墩的用钢量及强度增加,但钢桥墩的抗震延性并不与用钢量成正比增加.考虑抗震性能和经济效益等设计指标,4T补强圆形桥墩优于其他桥墩.

In the paper, the ductility and ultimate strength of steel tubular piers with the T reinforcing rib subjected to cyclic horizontal loading and a constant vertical loading were analytically studied. Under the circumstances that experimental data tally with numerical values, the nonlinear load - displacement hysteretic curves for 5 specimens of circular steel with reinforcing rib were obtained by using the finite element package Abaqus. The reinforcing steel piers yield displacement and maximum displacement are similar, but the speed of degradation of the strength of the reinforcing steel piers are significant different. From the different definitions of ductility curves ,4T and 8T type of rib piers have the optimal ductility. Considering the volume of steel and economic factors, the 4T type of rib piers use half the amount of steel for the ST, however, they have similar ductility. With the increase of the number of reinforcement ribs, the steel consumption and intensity of steel piers are increased, but the ductility of steel bridge piers is not proportional to increase with the increase of steel. Results indicated that the steel column with 4 T reinforcing rib have better seismic performance and economic efficiency.