高烈度地区多跨长联连续梁桥抗震体系研究  

Research of Seismic Systems for Multi-Span and Long Unit Continuous Girder Bridges in High Seismic Intensity Region

作　　者：贾毅[1] 赵人达[1] 廖平[1] 李福海[1,2] 邱新林 

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]陆地交通地质灾害防治技术国家工程实验室,四川成都610031 [3]广东省南粤交通潮漳高速公路管理中心,广东广州510101

出　　处：《桥梁建设》2017年第5期41-46,共6页Bridge Construction

基　　金：国家自然科学基金项目(51308471);国家重点研发计划(2016YFB1200401);广东省交通厅科技计划项目(2014-02-015)~~

摘　　要：为研究高烈度地区多跨长联连续梁桥采用不同抗震体系时的抗震性能,以韩江特大桥主桥[(55+4×90+55)m连续梁桥]为背景,分别采用传统抗震体系、延性抗震体系和减隔震体系进行抗震设计,采用ANSYS软件建立全桥有限元模型,比较采用不同抗震体系时桥墩在罕遇地震作用下的地震响应。结果表明:在罕遇地震作用下,连续梁桥采用减隔震体系时,摩擦摆支座顺桥向来回滑动,形成稳定、饱满的滞回环,支座耗散地震能量显著;采用延性抗震体系时,固定墩墩底滞回曲线为完整的滞回环,地震能量通过塑性铰的滞回机制进行耗散;采用减隔震体系时,桥墩的顺桥向位移较传统抗震体系大幅降低;采用延性抗震体系时,桥墩的顺桥向位移比传统抗震体系下大;采用减隔震体系或延性抗震体系时,固定墩的内力响应较传统抗震体系下都大幅降低,且采用减隔震体系时减震效果更好。To investigate the seismic performance of the multi-span and long unit continuous girder bridges using the different seismic systems in the high seismic intensity region,the main bridge of the Hanjiang River Bridge[a continuous girder bridge with span arrangement（55＋4×90＋55）m]was cited as an example and the seismic design of the bridge was carried out,respectively using the conventional seismic system,ductility seismic system and the seismic mitigation and isolation system.The software ANSYS was used to set up the finite element model for the whole bridge of the bridge and the seismic responses of the piers of the bridge using the different seismic systems under the action of the rare earthquake were compared.The results show that under the rare earthquake and when the isolation systems are used on the continuous girder bridges,the friction pendulum bearings slide to-and-fro along the bridges,the sliding of the bearings produces the stable and plump hysteresis loops and the seismic energy dissipation of the bearings is notable.When the ductility systems are used,the hysteretic curves of the fixed pier footings are the complete hysteresis loops and the seismic energy is dissipated via the hysteresis mechanism of the plastic hinges.When the isolation systems are used,the displacement of the piers along the bridges greatly decreases as compared to the case when the conventional systems are used.When the ductility systems are used,the displacement of the piers along the bridges is greater than that when the conventional systems are used.When the isolation systems or the ductility systems are used,the internal force responses of the fixed piers all greatly decrease as compared to the case when the conventional systems are used and the seismic mitigation effects of the isolation systems work even better.

关 键 词：连续梁桥 多跨长联 抗震性能 延性抗震体系 减隔震体系 内力 位移 有限元法 

分 类 号：U448.215[建筑科学—桥梁与隧道工程] U442.55[交通运输工程—道路与铁道工程]