白河特大桥主桥抗震性能分析
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摘要
以白河特大桥主桥为研究对象,采用有限单元法,对其进行抗震性能分析,以提高其抗震能力;运用有限元程序Midas/Civil,结合该桥的结构特点,建立了桥梁的空间有限元模型,对其分别进行自振特性、反应谱和地震波下的时程响应分析。计算结果表明:该桥梁整体刚度较大,整体竖向刚度相对其横向、纵向刚度弱,桥梁振动以竖向振动形式为主;24号桥墩墩底截面受力最为不利,可作为全桥抗震设计的控制截面;并建议在主梁两端支座处需采取一定挡护措施,避免主梁两端在地震中产生横向偏离支座的情况发生。
The aseismic performance of the main bridge of Bai River Grand Bridge was analysed by the finite element method to improve its structural seismic resistance capability.According to its characteristic,the space finite element model of the bridge was established by the Midas/Civil program,the analysis on the structural self-vibration characteristic,response spectrum and time domain response under earthquake wave were all made.The results of calculation indicate that,the whole rigidity of bridge is strong;vertical vibration modes give priority to the bridge;the most unfavorable working section is the bottom section of the pier No.24,which can be regarded as the control section in aseismic design of the bridge;the baffle should be used besides the bearings at the two ends of girder to keep the ends of girder from departing from the bearings.
The aseismic performance of the main bridge of Bai River Grand Bridge was analysed by the finite element method to improve its structural seismic resistance capability.According to its characteristic,the space finite element model of the bridge was established by the Midas/Civil program,the analysis on the structural self-vibration characteristic,response spectrum and time domain response under earthquake wave were all made.The results of calculation indicate that,the whole rigidity of bridge is strong;vertical vibration modes give priority to the bridge;the most unfavorable working section is the bottom section of the pier No.24,which can be regarded as the control section in aseismic design of the bridge;the baffle should be used besides the bearings at the two ends of girder to keep the ends of girder from departing from the bearings.
引文
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[2]JTJ 004-89,公路工程抗震设计规范[S].JTJ 004-89,Specification of Earthquake Resistant Design forHighway Engineering[S].
[3]MIDAS.土木结构分析[M].北京:北京迈达斯技术有限公司,2005.MIDAS.Analysis for Civil Structure[M].Beijing:Midas IT(Beijing)Co.,Ltd.,2005.
[4]李静斌,葛素娟,陈淮.5跨连续中承式钢管混凝土拱桥抗震性能分析[J].世界地震工程,2005,21(3):110-115.LI Jing-bin,GE Su-juan,CHEN Huai.Aseismic Characteris-tic Analysis of a 5-span Continuous Half-through CFST ArchBridge[J].World Earthquake Engineering,2005,21(3):110-115.
[5]范立础.桥梁抗震[M].上海:同济大学出版社,1997.FAN Li-chu.Earthquake Resistance of Bridge[M].Shanghai:Tongji University Press,1997.
[6]胡人礼.桥梁抗震设计[M].北京:中国铁道出版社,1984.HU Ren-li.Seismic Design of Bridge[M].Beijing:China Rail-way Publishing House,1984.
[7]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.FAN Li-chu,HU Shi-de,YE Ai-jun.Seismic Design of LongSpan Bridge[M].Beijing:China Communications Press,2001.
[8]叶爱君.桥梁抗震[M].北京:人民交通出版社,2002.YE Ai-jun.Earthquake Resistance of Bridge[M].Beijing:ChinaCommunications Press,2002.
[9]赵大亮,李爱群,丁幼亮,等.大跨度桥梁地震反应谱的发展[J].公路交通科技,2006,23(2):79-82,85.ZHAO Da-liang,LI Ai-qun,Ding You-liang,et al.Deve-lopment of Seismic Response Spectrum for Long Span Bridge[J].Journal of Highway and Transportation Research and De-velopment,2006,23(2):79-82,85.
[10]林新元,王克海.太枣沟大桥地震响应分析[J].公路交通科技,2004,21(8):68-70.LIN Xin-yuan,WANG Ke-hai.Analysis of Seismic Responsefor Taizaogou Bridge[J].Journal of Highway and Transporta-tion Research and Development,2004,21(8):68-70.
[11]李贞新,李俊,李小珍,等.宜宾长江公路大桥主桥地震反应分析[J].公路交通科技,2006,23(7):64-67.LI Zhen-xin,LI Jun,LI Xiao-zhen,el al.Earthquake Re-sponse Analysis of the Main Highway Bridge of Yibin YangtziRiver Bridge[J].Journal of Highway and Transportation Re-search and Development,2006,23(7):64-67.
[12]谢旭.桥梁结构地震响应分析与抗震设计[M].北京:人民交通出版社,2006.XIE Xu.Seismic Response Analysis and Seismic Design for BridgeStructure[M].Beijing:China Communications Press,2006.
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