大跨高墩小半径刚构-连续组合梁桥地震响应分析
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摘要
为研究大跨高墩小半径刚构-连续组合曲线梁桥的地震响应,以某(40+6×80+40)m的刚构-连续组合梁铁路特大桥为背景进行分析。采用ANSYS建立全桥有限元模型,计算桥梁动力特性,并采用反应谱法和时程分析法对桥梁在地震作用下的内力和位移进行分析。分析结果表明:增大桥墩刚度、采用墩梁固结方式能够提高刚构-连续组合曲线梁桥的整体性,有利于桥梁的抗震;从地震响应(位移、弯矩)综合考虑,对该类桥梁最不利的地震波激励角度为0°、90°(分别对应顺桥向、横桥向),增大横向刚度可减小桥梁结构的横向位移,增大墩底截面面积可减小桥梁结构在水平地震作用下的地震响应;总体上来说,在横桥向地震波激励下该类桥梁横向位移和面外弯矩最大,在顺桥向地震波激励下该类桥梁纵向位移和面内弯矩最大。
To study the seismic response of the long span,high-rise pier and short radius curved hybrid bridge of rigid frame and continuous girder,a railway bridge of the same structural type with span arrangement(40+6×80+40) m was cited as an example and analyzed.The ANSYS was used to set up the finite element model for the whole bridge of the bridge,the dynamic properties of the bridge were calculated and the internal forces and displacement under the seismic action were analyzed,using the response spectrum method and the time-history analysis method.The results of the analysis reveal that the increase of rigidity of the bridge piers and the application of rigid fixity of the piers and girder can improve the integrality of the curved hybrid bridge of rigid frame and continuous girder and are advantageous to the seismic resistance.In comprehensive consideration of the seismic response(e.g.displacement and moment),the worst seismic wave excitation angles of the bridge of such type are 0°and 90°(respectively corresponding to the longitudinal and transverse directions of the bridge).The increase of the transverse rigidity can decrease the displacement of the bridge in the transverse direction and the increase of the sectional areas of footings of the piers can reduce the seismic response of the bridge under the horizontal seismic action.In general,the transverse displacement and out-of-plane moment of the bridge under the seismic wave excitation in the transverse direction are the maximum while the longitudinal displacement and in-plane moment of the bridge under the excitation in the longitudinal direction are also the maximum.
To study the seismic response of the long span,high-rise pier and short radius curved hybrid bridge of rigid frame and continuous girder,a railway bridge of the same structural type with span arrangement(40+6×80+40) m was cited as an example and analyzed.The ANSYS was used to set up the finite element model for the whole bridge of the bridge,the dynamic properties of the bridge were calculated and the internal forces and displacement under the seismic action were analyzed,using the response spectrum method and the time-history analysis method.The results of the analysis reveal that the increase of rigidity of the bridge piers and the application of rigid fixity of the piers and girder can improve the integrality of the curved hybrid bridge of rigid frame and continuous girder and are advantageous to the seismic resistance.In comprehensive consideration of the seismic response(e.g.displacement and moment),the worst seismic wave excitation angles of the bridge of such type are 0°and 90°(respectively corresponding to the longitudinal and transverse directions of the bridge).The increase of the transverse rigidity can decrease the displacement of the bridge in the transverse direction and the increase of the sectional areas of footings of the piers can reduce the seismic response of the bridge under the horizontal seismic action.In general,the transverse displacement and out-of-plane moment of the bridge under the seismic wave excitation in the transverse direction are the maximum while the longitudinal displacement and in-plane moment of the bridge under the excitation in the longitudinal direction are also the maximum.
引文
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[3]彭凯,李建中,范立础.高墩梁桥考虑墩身高阶振动的水平向主导振型[J].振动与冲击,2008,(7):63-68,186-187.(PENG Kai,LI Jian-zhong,FAN Li-chu.HorizontalPredominant Vibration Modes of High-Pier BeamBridges in View of Higher-Order Vibration of PierShafts[J].Journal of Vibration and Shock,2008,(7):63-68,186-187.in Chinese)
[4]周勇军.高墩大跨曲线连续刚构桥梁地震响应的设计参数研究(博士学位论文)[D].西安:长安大学,2006.(ZHOU YONG-jun.Study of Design Parameters Af-fecting Seismic Response of Long-Span and High-RisePier Curved Continuous Rigid-Frame Bridges(Doctor-ate Dissertation)[D].Xi′an:Chang′an University,2006.in Chinese)
[5]王达,刘扬,陈敏海.超高墩大跨部分曲线连续刚构桥地震反应分析[J].公路交通科技,2011,28(1):74-79.(WANG Da,LIU Yang,CHEN Min-hai.Seismic Re-sponse Analysis of Partially Curved Long Span Contin-uous Rigid-Frame Bridge with Very High-Rise Piers[J].Journal of Highway and Transportation Researchand Development,2011,28(1):74-79.in Chinese)
[6]单德山,李乔.铁路曲线梁桥抗震设计分析[J].重庆交通学院学报,2005,24(1):1-4,15.(SHAN De-shan LI Qiao.Study of Seismic Design forRailway Curved Girder Bridge[J].Journal ofChongqing Jiaotong University,2005,24(1):1-4,15.in Chinese)
[7]张伟,刘建新,张茜,等.大跨径连续刚构桥地震反应分析[J].工程抗震与加固改造,2005,27(6):72,75-78.(ZHANG Wei,LIU JIAN-xin,ZHANG Qian,et al.Seismic Response Analysis of Long-Span ContinuousRigid-Framed Bridge[J].Earthquake Resistant Engi-neering and Retrofitting,2005,27(6):72,75-78.inChinese)
[8]宋雷,贺立新.铅芯橡胶支座在简支梁桥减隔震中的应用[J].桥梁建设,2012,42(3):86-93.(SONG Lei,HE Li-xin.Application of Lead CoreRubber Bearings to Seismic Mitigation and Isolation ofSimply-Supported Girder Bridges[J].Bridge Construc-tion,2012,42(3):86-93.in Chinese)
[9]范立础.桥梁抗震[M].上海:同济大学出版社,1996.(FAN Li-chu.Seismic Resistance of Bridges[M].Shanghai:Tongji University Press,1996.in Chinese)
[10]GB18306-2001,中国地震动参数区划图[S].(GB 18306-2001,Seismic Ground Motion ParameterZonation Map of China[S].)
[11]GB50111-2006,铁路工程抗震设计规范[S].(GB 50111-2006,Code for Seismic Design of RailwayEngineering[S].)
[2]牛俊武,郭楠楠,马文涛.不同曲率半径对高墩大跨径连续刚构桥抗震性能影响分析[J].公路,2011,(9):137-141.(NIU Jun-wu,GUO Nan-nan,MA Wen-tao.Analysisof Influences of Different Curvature Radii on SeismicPerformance of High-Rise Pier and Long-Span Contin-uous Rigid-Frame Bridge[J].Highway,2011,(9):137-141.in Chinese)
[3]彭凯,李建中,范立础.高墩梁桥考虑墩身高阶振动的水平向主导振型[J].振动与冲击,2008,(7):63-68,186-187.(PENG Kai,LI Jian-zhong,FAN Li-chu.HorizontalPredominant Vibration Modes of High-Pier BeamBridges in View of Higher-Order Vibration of PierShafts[J].Journal of Vibration and Shock,2008,(7):63-68,186-187.in Chinese)
[4]周勇军.高墩大跨曲线连续刚构桥梁地震响应的设计参数研究(博士学位论文)[D].西安:长安大学,2006.(ZHOU YONG-jun.Study of Design Parameters Af-fecting Seismic Response of Long-Span and High-RisePier Curved Continuous Rigid-Frame Bridges(Doctor-ate Dissertation)[D].Xi′an:Chang′an University,2006.in Chinese)
[5]王达,刘扬,陈敏海.超高墩大跨部分曲线连续刚构桥地震反应分析[J].公路交通科技,2011,28(1):74-79.(WANG Da,LIU Yang,CHEN Min-hai.Seismic Re-sponse Analysis of Partially Curved Long Span Contin-uous Rigid-Frame Bridge with Very High-Rise Piers[J].Journal of Highway and Transportation Researchand Development,2011,28(1):74-79.in Chinese)
[6]单德山,李乔.铁路曲线梁桥抗震设计分析[J].重庆交通学院学报,2005,24(1):1-4,15.(SHAN De-shan LI Qiao.Study of Seismic Design forRailway Curved Girder Bridge[J].Journal ofChongqing Jiaotong University,2005,24(1):1-4,15.in Chinese)
[7]张伟,刘建新,张茜,等.大跨径连续刚构桥地震反应分析[J].工程抗震与加固改造,2005,27(6):72,75-78.(ZHANG Wei,LIU JIAN-xin,ZHANG Qian,et al.Seismic Response Analysis of Long-Span ContinuousRigid-Framed Bridge[J].Earthquake Resistant Engi-neering and Retrofitting,2005,27(6):72,75-78.inChinese)
[8]宋雷,贺立新.铅芯橡胶支座在简支梁桥减隔震中的应用[J].桥梁建设,2012,42(3):86-93.(SONG Lei,HE Li-xin.Application of Lead CoreRubber Bearings to Seismic Mitigation and Isolation ofSimply-Supported Girder Bridges[J].Bridge Construc-tion,2012,42(3):86-93.in Chinese)
[9]范立础.桥梁抗震[M].上海:同济大学出版社,1996.(FAN Li-chu.Seismic Resistance of Bridges[M].Shanghai:Tongji University Press,1996.in Chinese)
[10]GB18306-2001,中国地震动参数区划图[S].(GB 18306-2001,Seismic Ground Motion ParameterZonation Map of China[S].)
[11]GB50111-2006,铁路工程抗震设计规范[S].(GB 50111-2006,Code for Seismic Design of RailwayEngineering[S].)
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