铁路斜交桥墩地震响应探讨

Discussion on Seismic Response of Railway Skew Piers

正顶帽、斜墩身的结构形式在铁路桥梁工程中多被采用,因为这样既能最大限度地让出平面净宽,又能满足上部安放支承垫石等构造要求,较好地解决了跨越立交道路时的净空受限问题。以跨土羊公路特大桥为例,分别采用反应谱法、时程分析法和规范简化公式法等3种计算方法对其6号墩的地震响应进行分析,通过对比分析计算结果,提出此类桥墩抗震设计时的一些建议和注意事项。

There are many application examples of skew piers with right topcaps in railway bridge engineering.This structure can solve the problem that clear span and clear height are limited when crossing above the traffic roads,because it can furthest set aside the clear span,and satisfy the structural requirements of settling cushion blocks.Taking Tuyang Road Bridge as the example,this paper analyzes the seismic response of the sixth pier by using the response spectrum method,time-history method and the simplified formula method specified in design code respectively.And then this paper puts forward some design considerations and suggestions about seismic design of these piers based on the comparative analysis and calculation results.