桥墩系梁对连续刚构桥抗震性能的影响

Influence of Pier Tie Beam on Anti-Seismic Performance of Continuous Rigid Frame Bridge

为了研究连续刚构桥的抗震性能,以某大跨连续高墩刚构桥为依托,采用Midas/Civil软件建立仿真模型,通过时程分析方法研究双肢薄壁墩参数在地震响应下对高墩连续刚构桥抗震性能的影响;以2#桥墩系梁个数为主要参数,以模型自振频率、桥墩墩顶、墩底位移及内力变化3个方面对其抗震性能进行评价。研究结果表明,随着2#桥墩系梁个数的增加,桥梁频率不断增大,2#墩墩底及2#墩主梁根部出现内力最大值。随2#墩系梁个数的增加,2#墩内力越来越大,1#墩内力逐渐减小。

In order to study the anti-seismic performance of continuous rigid frame bridge,based on a Long-span Continuous High Pier Rigid Frame Bridge,the simulation model was established by Midas/Civil software,and the influence of parameters of double limb thin-walled pier on anti-seismic performance of continuous rigid frame bridge with high piers under seismic response was studied by time history analysis method.Taking the number of tie beam on No.2 pier as the main parameter,the anti-seismic performance of the model was evaluated from three aspects:the natural frequency of the model,the displacement of the pier top and bottom,and the internal force variation.The results show that with the increase of tie beams of No.2 pier,the bridge frequency increases,and the maximum internal forces appear at the bottom of No.2 pier and the root of main beam of No.2 pier.With the increase of tie beams of No.2 pier,the internal force of No.2 pier increases and that of No.1 pier decreases.