近断层地震下小半径曲线桥碰撞响应的振动台试验研究  

SHAKING TABLE TESTS OF THE SEISMIC POUNDING EFFECT ON A SMALL RADIUS CURVED BRIDGE UNDER NEARFAULT GROUND MOTIONS

作　　者：焦驰宇[1,3] 刘文勃 桂晓珊 龙佩恒[1,2] 吴宜峰 JIAO Chi-yu;LIU Wen-bo;GUI Xiao-shan;LONG Pei-heng;WU Yi-feng(BUCEA,Beijing Advanced Innovation Center for Future Urban Design,Beijing 100044,China;BUCEA,Engineering Structure and New Materials Research Center of Beijing higher education institutions,Beijing 100044,China;Tongji University,State Key Laboratory of Disaster Prevention in Civil Engineering,Shanghai 200092,China;BUCEA,Beijing Collaborative Innovation Center for Technology of Energy Saving and Emission Reduction,Beijing 100044,China;Beijing Guodaotong Highway Design&Research Institute Co.,Ltd.,Beijing 100053,China)

机构地区：[1]北京建筑大学未来城市设计高精尖创新中心,北京100044 [2]北京建筑大学工程结构与新材料北京高等学校工程研究中心,北京100044 [3]同济大学土木工程防灾国家重点实验室,上海200092 [4]北京建筑大学北京节能减排关键技术协同创新中心,北京100044 [5]北京国道通公路设计研究院股份有限公司,北京100053

出　　处：《工程力学》2020年第8期189-201,共13页Engineering Mechanics

基　　金：北京市优秀人才培养-青年拔尖个人项目(2015000026833ZK05);国家青年自然科学基金项目(51308027,51508019,51908024);北京市自然科学基金面上项目(8162012,8194057);土木工程防灾国家重点实验室开放基金项目(SLDRCE-14-02);建设部研究开发项目(2015-R2-039);北京市教委科技计划面上项目(2013)(KM201310016007)。

摘　　要：为揭示小半径曲线桥相邻联碰撞导致的地震破坏机理,以某两联多跨小半径曲线桥为工程背景,开展振动台试验研究。分析在不同地震动下相邻联周期比变化对曲线桥梁端位移、墩梁相对位移、碰撞力等的影响规律;在近断层地震下,分析受独柱墩横桥向偏心效应影响时,邻梁碰撞对结构动力响应的变化规律。试验研究表明:近断层脉冲地震下,随着周期比的增大邻梁碰撞效应先增加后减小,在近断层非脉冲地震动及远场地震动下,随邻梁周期比减小地震碰撞响应逐渐增大;独柱墩在梁底的横向偏心会加剧地震作用下主梁运动形式的变化,导致扭转加大,横向位移明显,更易发生非均匀碰撞,加剧主梁的局部损坏。该文研究成果可为考虑碰撞的曲线桥抗震设计提供科学依据。A two-segment multi-span curved bridge with a small radius were established and a series shaking table tests were carried out in order to reveal the mechanism of earthquake damage due to adjacent girder pounding of small radius curved bridges.The paper analyzed the effect of the change of adjacent segment period ratio on such responses as the displacement at the end of the curved bridge,the relative displacement of pier and girder and the pounding force under different ground motions.The dynamic response of adjacent girder pounding effects are analyzed under the influence of lateral eccentric effect of single column pier excited by near fault earthquake.There are four main conclusions in this paper.Firstly,the pounding effect of adjacent girders firstly increases and then decreases with the increase of the period ratio under near-fault pulse earthquakes.Secondly,the pounding response increases gradually with the decrease of the period ratio of adjacent girders under the nearfault non-pulse ground motions and far-field earthquake motions.Thirdly,the lateral eccentricity of the singlecolumn pier at the bottom of the girder increases the change of the movement form of the main girder under the earthquake action,resulting in an increase of torsion and lateral displacements.Fourthly,such increased torsion and lateral displacements often result in non-uniform pounding effect appear,which aggravates the local damage of the main girder.The major findings of this paper can provide a scientific basis for better seismic design of curved bridges considering seismic pounding.

关 键 词：小半径曲线桥 地震碰撞 近断层地震动 振动台试验 相邻联周期比 独柱墩偏心 

分 类 号：U441+.3[建筑科学—桥梁与隧道工程]