不同波速对刚构桥地震响应影响分析
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摘要
地震激励的输入是大跨桥梁结构抗震设计中最薄弱的环节。大跨度桥梁由于基础间的间距较大,因而在进行地震响应分析是应考虑行波效应的影响。结合工程实例,建立了空间有限元仿真模型,并且对模型进行了全桥结构动力分析,得到了该桥基本的动力特性参数,并对其进行了不同波速作用下行波效应的分析,与一致激励下的结果进行了对比,分析结果将为大跨刚构桥的地震设计提供参考。
The importation of the earthquake incentive is the weakest link in the seismic design of large-span bridge structure.As the greater distance between the foundations of large-span bridge structure,the traveling wave effect should be considered in the earthquake response analysis.According to the engineering cases,the space finite element simulation model is set up,and is carried out of the structural dynamic analysis of the whole bridge to achieve the basic dynamic characteristic parameters of this bridge.The article analyzes the traveling wave effect of the bridge under the different wave velocities of action,and compares the results under the same incentive.The analysis results can be referred for the seismic design of long-span rigid-framed bridge.
The importation of the earthquake incentive is the weakest link in the seismic design of large-span bridge structure.As the greater distance between the foundations of large-span bridge structure,the traveling wave effect should be considered in the earthquake response analysis.According to the engineering cases,the space finite element simulation model is set up,and is carried out of the structural dynamic analysis of the whole bridge to achieve the basic dynamic characteristic parameters of this bridge.The article analyzes the traveling wave effect of the bridge under the different wave velocities of action,and compares the results under the same incentive.The analysis results can be referred for the seismic design of long-span rigid-framed bridge.
引文
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[11]J.M.Caicedo.Comparision of Modeling Techniques for Dynamic Analysisof a Cable-Stayed Bridge[A].Proceedings of the Engineering mechanics specialty onferenee[C].Austin,Texas,2000.
[2]克拉夫.J.结构动力学[M].北京:高等教育出版社,2006.
[3]丰硕,项贻强,王智峰.大跨径连续刚构桥的动力性能及地震响应分析[J].中南公路工程,2005,30(4).
[4]王蕾,赵成刚,汪劲丰.考虑地形影响和多点激励的大跨高墩桥地震响应分析[J].土木工程学报,2006,39(1).
[5]吴东.多点激励下大跨桥梁的地震反应分析[D].成都:西南交通大学,2006.
[6]谢开仲,秦荣,王建军.大跨度钢管混凝土拱桥地震反应分析[J].中南公路工程,2005,30(2).
[7]刘洪冰,范立础.大跨桥梁考虑地形及多点激励的地震响应分析[J].同济大学学报:自然科学版,2003,31(6).
[8]李忠献,史志利.行波激励下大跨度连续刚构桥的地震响应分析[J].地震工程与工程振动,2003,23(2).
[9]Fajfar P.A Nolinear Analysis Method for Performance based Seismic Design[J].Earthquake Spectra,2000,16(8).
[10]张亚辉,李丽媛,陈艳,等.大跨度结构地震行波效应研究[J].大连理工大学学报,2005(4).
[11]J.M.Caicedo.Comparision of Modeling Techniques for Dynamic Analysisof a Cable-Stayed Bridge[A].Proceedings of the Engineering mechanics specialty onferenee[C].Austin,Texas,2000.
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