大跨度CFST拱桥地震行波效应研究
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摘要
在大跨度拱桥的地震分析中,行波效应的影响备受关注,且在视波速的选择上有较大的区间,致使所得结论不统一。以湖南益阳茅草街大桥为研究对象,基于ANSYS软件建立了该大跨度中承式钢管混凝土(CFST)系杆拱桥的三维有限元模型,对茅草街大桥的地震反应进行了空间非线性时程分析,得到边拱、主拱拱脚弯矩,以及各拱顶位移等响应量随视波速变化曲线,据此分析了以上结构响应在行波作用下的变化规律。结果表明:行波效应对大跨度CFST拱桥地震响应有较大影响,行波效应的影响与结构特性以及地震波特性密切相关。
The influences of traveling wave have been paid great attention in seismic analyses for long-span arch bridge.However,the apparent wave velocities can be chosen in a wide range,so there have not yet been definite conclusions about the influence.Taking the Maocaojie Bridge as an example a spatial finite element model for Concrete Filled Steel Tube(CFST) was established based on the software ANSYS,Then a three-dimensional nonlinear time history analysis for the bridge was investigated.The moments of arch crown and springing,the longitudinal displacements of key positions and the relative displacements between the girders and ribs,due to different apparent wave velocities,were calculated.Results show that traveling wave has comparatively large influences on the seismic responses of long-span CFST arch bridges,and the influences are closely correlated with the characteristics of the bridge structure and the seismic wave.
The influences of traveling wave have been paid great attention in seismic analyses for long-span arch bridge.However,the apparent wave velocities can be chosen in a wide range,so there have not yet been definite conclusions about the influence.Taking the Maocaojie Bridge as an example a spatial finite element model for Concrete Filled Steel Tube(CFST) was established based on the software ANSYS,Then a three-dimensional nonlinear time history analysis for the bridge was investigated.The moments of arch crown and springing,the longitudinal displacements of key positions and the relative displacements between the girders and ribs,due to different apparent wave velocities,were calculated.Results show that traveling wave has comparatively large influences on the seismic responses of long-span CFST arch bridges,and the influences are closely correlated with the characteristics of the bridge structure and the seismic wave.
引文
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[2]Dumanogluid A A,Soyluk K.A stochastic analysis oflong-span structures subjected to spatially varyingground motions including the site response effect[J].Engineering Structures,2003,25(10):1 301—1 310.
[3]焦常科,李爱群,王浩,等.三塔悬索桥行波效应研究[J].土木工程学报,2010,43(12):100—106.Jiao Changke,Li Aiqun,Wang Hao,et al.Travelingwave influence analysis for triple-tower suspensionbridges[J].China Civil Engineering Journal,2010,43(12):100—106.
[4]胡志明,李精英,黄天一.基于行波效应的钢管混凝土拱桥地震反应分析[J].桥梁建设,2010,(1):25—28.Hu Zhiming,Li Jingying,Huang Tianyi.SeismicResponse analysis of concrete-filled steel tube archbridge based on traveling wave effect[J].BridgeConstruction,2010,(1):25—28.
[5]孙广龙,宋建永,亓路宽,等.大跨径钢筋混凝土拱桥的地震时程响应分析[J].公路交通科技,2007,24(3):86—89.Sun Guanglong,Song Jianyong,Qi Lukuan,et al.Seismic time-history response analysis of long-spanarch bridge[J].Journal of Highway andTransportation Research and Development,2007,24(3):86—89.
[6]郑史雄,周述华.大跨度钢管混凝土拱桥的地震反应性能[J].西南交通大学学报,1999,34(3):320—324.Zheng Shixiong,Zhou Shuhua.The seismic responsebehavior of long span CFST arch bridge[J].Journalof Southwest JiaoTong University,1999,34(3):320—324.
[7]王浩,杨玉冬,李爱群,等.土-桩-结构相互作用对大跨度CFST拱桥地震反应的影响[J].东南大学学报,2005,35(3):433—437.Wang Hao,Yang Yudong,Li Aiqun,et al.Influences of soil-pile-structure interaction on seismicresponse of long span CFST arch bridge[J].Journalof Southeast University,2005,35(3):433—437.
[8]范立础.桥梁抗震[M].上海:同济大学出版社,1997.
[9]范立础,胡世德,叶爱君.大跨度桥梁抗震设计[M].北京:人民交通出版社,2001.
[10]李纲.大跨度钢管混凝土拱桥行波效应及减震分析[D].西安:西安建筑科技大学,2008.Li Gang.Analysis of the traveling wave effect andvibration reducing of long-span concrete-filled steeltubular arch bridges[D].Xi’an:Xi’an University ofArchitecture and Technology,2008.
[11]陈宝春.钢管混凝土拱桥[M].北京:人民交通出版社,2007.Chen Baochun.Concrete-Filled Steel Tubular ArchBridge[M].Beijing:China Communication Press,2007.
[12]湖南省防震减灾工程研究中心.益阳市茅草街大桥地震安全性评价研究报告[R].2001.
[13]公路桥梁抗震设计细则(JTG/T B02-01-2008)[S].中华人民共和国交通运输部,2008.
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