高速铁路桥梁基于摩擦摆支座的减隔震研究

Study on Seismic Isolation of High Speed Railway Bridge with Friction Pendulum Bearings

探讨了高速铁路桥梁基于摩擦摆支座减、隔震的设计原则,采用非线性时程分析方法研究了高速铁路多跨简支梁桥的摩擦摆支座隔震效果。分析中考虑了墩高、地震强度及场地类型变化对摩擦摆支座隔震桥梁地震反应的影响。结果表明,墩高变化对墩底弯矩及其减、隔震效果有较大影响,地震强度变化对隔震桥的墩底弯矩也有较大影响,但对减、隔震率的影响很小,墩高及地震强度对隔震支座的最大水平滑动位移影响较大。墩高7m及墩高13m的高速铁路桥梁减、隔震效果显著,摩擦摆减、隔震支座在高速铁路桥梁中有较好的应用前景。

Principles of isolation design for high speed railway bridges using friction pendulum bearing （FPB） are investigated. Isolation effect of a multi-span simple beam of high speed railway bridges with FPB is performed by using nonlinear time history method. Effect on seismic isolation is studied by varying pier height, earthquake intensity and site category. The results show that base moment and its seismic reduction ratio are obviously influenced by variation of pier height and earthquake intensity, but seismic reduction ratio for base moment is slightly influenced by varying earthquake intensity, and the maximum seismic displacement of FPB is obviously influenced by varying pier height and earthquake intensity. Isolation effect is significant for high speed railway bridges with pier height 7m to 13m, and FPB has good prospects in high speed railway bridges.