FPS隔震简支梁桥近断层地震响应研究  

Study of Near-Fault Seismic Response of Simply-Supported Bridges with FPS Bearings

作　　者：张常勇 钟铁毅[2] 李徐[2] 杨海洋[2] 

机构地区：[1]山东省交通规划设计院,山东济南250031 [2]北京交通大学土木建筑工程学院,北京100044

出　　处：《世界桥梁》2014年第5期48-53,共6页World Bridges

摘　　要：为研究近断层地震作用下摩擦摆支座(FPS)在桥梁结构中的使用效果,建立了一跨FPS隔震铁路简支梁桥的三维有限元分析模型,以9条典型近断层地震记录作为激励,采用非线性时程分析方法对其顺桥向地震响应进行计算,并对结果进行对比分析。研究结果表明:在近断层地震作用下,FPS支座可以发挥一定的隔震作用,且大部分情况下,增大FPS支座等效曲率半径可提高其隔震效率,这与非近断层地震作用下的情况相同,但仅使用FPS支座进行隔震设计有时并不足以满足桥梁结构的抗震能力要求,需要采取其它必要的抗震、减隔震措施与FPS支座共同工作,以保证桥梁结构安全。To examine the application effect of Friction Pendulum System （FPS） bearings in bridge structures under the action of near-fault earthquakes ,the three-dimensional finite element analytical model of a one-span simply-supported railway bridge with FPS bearings was established . The records of nine typical near-fault earthquakes were taken as excitors ,the non-linear time-his-tory analytical method was used to calculate the seismic response in the longitudinal bridge direc -tion ,and the results were contrastively analyzed .The results of the study indicate that under the action of near-fault earthquakes ,FPS bearings are able to mitigate the earthquake energy to a cer-tain extent ,and under most circumstances ,the increase of the equivalent curvature radius of FPS bearings leads to the enhancement of the seismic mitigation effect ,which is similar to the effect un-der the action of non-near-fault earthquakes .However ,only using FPS bearings can not satisfy the anti-seismic requirements of the bridge structure under certain circumstances .Thus ,it is necessary to take other seismic mitigation and isolation measures to assist the FPS bearings so as to assure the bridge structure safety .

关 键 词：隔震桥梁 近断层地震 摩擦摆支座 地震响应 减隔震设计 非线性时程分析 

分 类 号：U442.55[建筑科学—桥梁与隧道工程] U443.36[交通运输工程—道路与铁道工程]