地震序列下落梁震害的防灾设计分析
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摘要
地震的发生具有丛集的特征,主震发生之后通常伴随余震,主震震级越高其余震震级亦越高,对结构的破坏越大。桥梁结构作为重要交通枢纽工程,其在整个地震序列发生时应能确保通行。为得到桥梁结构在地震系列作用下的响应,选用集集地震序列对桥梁进行地震响应分析,结果显示结构在主震作用下发生落座,余震时有发生落梁的可能,对结构设置连梁装置,验证其在地震序列中的防落梁效果。结果显示连梁装置可有效减小桥梁上、下部结构相对位移,同时可提高结构整体性,使各桥墩平均分配地震力,并能在地震序列中有效防止落梁震害的发生。
Earthquakes have the character of cluster,so aftershocks often happened after main earthquake.The more magnitude the main earthquake is,the heavier destruction the aftershocks is,so the earthquake damage to structures is huger.As an important part of lifeline engineering,bridges are required to be safety during the strong earthquake.In order to obtain the response of bridges under earthquake sequence,time-history analysis has been carried on the Chi-Chi earthquake sequence.The results show that the girders are falling down from supports under the main earthquake,and are possibly falling off the piers under aftershocks.The prevention devices of falling girder are designed for the bridge on account of the deck falling,the relative displacement between the superstructure and the substructure of the bridge is effectively reduced,the integrity and the anti-pushing rigidity of the structure are increased,and the seismic load have being well-distributed among the piers.The prevention devices can provide the efficient ultimate safety for the bridge structure under the earthquake sequence.
Earthquakes have the character of cluster,so aftershocks often happened after main earthquake.The more magnitude the main earthquake is,the heavier destruction the aftershocks is,so the earthquake damage to structures is huger.As an important part of lifeline engineering,bridges are required to be safety during the strong earthquake.In order to obtain the response of bridges under earthquake sequence,time-history analysis has been carried on the Chi-Chi earthquake sequence.The results show that the girders are falling down from supports under the main earthquake,and are possibly falling off the piers under aftershocks.The prevention devices of falling girder are designed for the bridge on account of the deck falling,the relative displacement between the superstructure and the substructure of the bridge is effectively reduced,the integrity and the anti-pushing rigidity of the structure are increased,and the seismic load have being well-distributed among the piers.The prevention devices can provide the efficient ultimate safety for the bridge structure under the earthquake sequence.
引文
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[2]张煜敏.考虑强震序列作用的连梁装置分析研究[D].西安:长安大学,2008.ZHANG Yumin.The analysis of unseating Prevention devices considering the excitation of strong earthquake sequence[D].Xi’an:Chang’an U-niversity,2008.
[3]杨迪雄,李刚.结构分灾抗震设计:概念和应用[J].世界地震工程.2007,23(4):95-101.YANG Dixiong,LI Gang.Damage-reduction seismic design of structures:concept and applications[J].World Earthquake Engineering,2007,23(4):95-101.
[4]吕晓健,高孟潭,高战武,等.强余震和主震地面运动分布比较研究[J].地震学报,2007,29(3):295-301.LU Xiaojian,GAO Mengtan,GAO Zhanwu,tetal.Comparison of the spatial distribution of ground motion between main shocks and strong aftershocks[J].Acta Seismologica Sinica,2007,29(3):295-301.
[5]朱文正,刘健新.公路桥梁连梁装置研究[J].公路交通科技,2009,26(4):68-72.ZHU Wenzheng,LIUJianxin.Research on unseating prevention device for highway bridges[J].Journal of Highway and Transportation Researchand Development,2009,26(4):68-72.
[6]汪芳芳.公路桥梁落梁防止装置的研究[D].西安:长安大学,2003.WANG Fangfang.Study on the collapse-proof device for highway bridge[D].Xi’an:Chang’an University,2003.
[7]刘健新,等.公路桥梁减震装置及设计方法研究总报告[R].西安:长安大学,2000.LIUJianxin,HUZhaotong,LI Ziqing.Research on design method and damping devices for bridge[R].Xi’an:Chang’an University,2000.
[8]JTG/TB02-01-2008公路桥梁抗震设计细则[S].JTG/TB02-01-2008 Guidelines for Resistant Design for highway Bridges[S].
[9](社)日本道路協?.道路橋示方书(V耐震设计篇).同解说[S].東京:日本道路協?,平成14年3月.Japan Road Association.Design specification of highway bridges,Part V:Seismic design[S].Tokyo:Maruzen Publishing Company,2002.
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