曲率半径对城市曲线桥梁地震反应的影响
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摘要
以某城市立交工程匝道桥为工程背景,采用MIDAS软件建立了全桥的有限元分析模型。采用反应谱方法研究了不同的曲率半径及地震激励方向对曲线桥梁地震反应的影响。结果表明:曲率半径对曲线桥梁前3阶自振频率影响比较明显;不同曲率半径及地震激励方向对曲线桥梁各墩地震反应的影响较大;应用0°～180°旋转激励法输入反应谱可以获得各个桥墩的最不利地震反应,且与《公路桥梁抗震设计细则》中规定的输入方法所得结果基本一致。
Based on a ramp bridge of interchange engineering in some city,the finite element analysis model of whole bridge was established in use of MIDAS software.Effect of different curvature radius and earthquake excitation directions on seismic response of the curved bridge was studied by means of response spectrum methods.The calculation results show that the curvature radius of the curved bridge has a great effect on the first three natural frequencies.Different curvature radius of the bridge and earthquake excitation direction have relative great effect on seismic response of each pier.The most unfavorable earthquake response of each pier can be obtained using rotation excitation method by inputting response spectrum from 0°-180°.The results are almost as the same as that from input methods specified in Guidelines for Seismic Design of Highway Bridges.
Based on a ramp bridge of interchange engineering in some city,the finite element analysis model of whole bridge was established in use of MIDAS software.Effect of different curvature radius and earthquake excitation directions on seismic response of the curved bridge was studied by means of response spectrum methods.The calculation results show that the curvature radius of the curved bridge has a great effect on the first three natural frequencies.Different curvature radius of the bridge and earthquake excitation direction have relative great effect on seismic response of each pier.The most unfavorable earthquake response of each pier can be obtained using rotation excitation method by inputting response spectrum from 0°-180°.The results are almost as the same as that from input methods specified in Guidelines for Seismic Design of Highway Bridges.
引文
[1]孙治国,王东升,郭迅.汶川大地震绵竹市回澜立交桥震害调查[J].地震工程与工程振动,2009,29(4):132-138.Sun Zhiguo,Wang Dongsheng,Guo Xun.Damage investigation of Huilan interchange in Mianzhu after Wenchuan earthquake[J].Journal of Earth-quake Engineering and Engineerin Vibration,2009,29(4):132-138.
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[7]冯云田,李明端.复杂结构的弹性地震反应分析[J].地震工程与工程振动,1991,11(12):77-86.Fen Yuntian,Li Mingrui.Elastic earthquake response analysis for complex structures[J].Journal of Earthquake Engineering and Engineerin Vibra-tion,1991,11(12):77-86.
[8]JTG/T B02-01-2008,公路桥梁抗震设计细则[S].JTG/T B02-01-2008,Guidelines for seismic design of highway bridges[S].
[9]朱东生,刘世忠,虞庐松.曲线桥地震反应研究[J].中国公路学报,2002,15(3):42-48.Zhu Dongsheng,Liu Shizhong,Yu Lusong.Research on seismic response of curved girder bridges[J].China Journal of Highway and Transport,2002,15(3):42-48.
[2]朱东生,虞庐松,刘世忠.不规则桥梁地震动输入主方向的研究[J].兰州铁道学院学报,2000,19(6):37-40.Zhu Dongsheng,Yu Lusong,Liu Shizhong.The study of earthquake input principal direction for irregular bridges[J].Journal of Lanzhou RailwayUniversity(Natural Sciences),2000,19(6):37-40.
[3]聂丽英,范立础,李建中.复杂结构地震动输入方向的基本原理及其影响[J].地震工程与工程振动,2003,23(3):30-34.Nie Liying,Li Jianzhong,Fan Lichu.Principle and effect of critical angle of complicated structure in dynamic analysis[J].Journal of EarthquakeEngineering and Engineerin Vibration,2003,23(3):30-34.
[4]张俊杰,林道锦,胡世德.反应谱法确定地震动最不利输入方向[J].世界地震工程,1999,15(4):38-40.Zhang Junjie,Lin Daojin,Hu Shide.Determination of the least favourable direction of ground motion with response spectrum analysis method[J].World Earthquake Engineering,1999,15(4):38-40.
[5]滕军,吕海霞,吴红军,等.高墩小半径曲线梁桥抗震分析的若干问题探讨[J].工程抗震与加固.2008,30(5):55-60.Teng Jun,LüHaixia,Wu Hongjun,et al.Discussion about dynamic responses of high-pier and small radius curved bridge[J].Earthquake Resist-ant Engineering and Retrofitting,2008,30(5):55-60.
[6]王丽,周锡元,闫维明.曲线梁桥地震响应的简化分析方法[J].工程力学,2006,23(6):77-84.Wang Li,Zhou Xiyuan,Yan Weiming.Simplified analysis method for seismicresponse of curved bridges[J].Engineering Mechanics,2006,23(6):77-84.
[7]冯云田,李明端.复杂结构的弹性地震反应分析[J].地震工程与工程振动,1991,11(12):77-86.Fen Yuntian,Li Mingrui.Elastic earthquake response analysis for complex structures[J].Journal of Earthquake Engineering and Engineerin Vibra-tion,1991,11(12):77-86.
[8]JTG/T B02-01-2008,公路桥梁抗震设计细则[S].JTG/T B02-01-2008,Guidelines for seismic design of highway bridges[S].
[9]朱东生,刘世忠,虞庐松.曲线桥地震反应研究[J].中国公路学报,2002,15(3):42-48.Zhu Dongsheng,Liu Shizhong,Yu Lusong.Research on seismic response of curved girder bridges[J].China Journal of Highway and Transport,2002,15(3):42-48.
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