考虑结构-水相互作用的连续刚构桥水平地震反应分析
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摘要
以三水二桥为实例,采用结构有限元法对具有单肢薄壁墩的连续刚构桥进行水平地震反应分析,分析时考虑了桩-土相互作用和结构-水相互作用以及不同水深对结构地震反应的影响。计算结果表明:桩-土相互作用和结构-水相互作用对该种连续刚构桥的抗震是不利的;按反应谱法计算所得桥墩的横向内力较大,按时程分析法计算所得主梁内力和桥墩的纵向内力较大;连续刚构桥抗震设计时应采用反应谱法和时程分析法相结合进行分析,所得的成果和分析结论可供同类桥抗震分析参考。
Taking Sanshui 2nd Bridge as an example,horizontal seismic response of continuous rigid frame bridges with single thin piers was studied.Pile-soil interaction and structure-water interaction were considered,and seismic response affected by different water depths was analyzed.The calculated results indicate that it is detrimental to continuous rigid frame bridges when pile-soil interaction and structure-water interaction are considered.Transverse internal force of bridge piers calculated with response spectrum method is bigger;internal force of main girder and longitudinal internal force of bridge piers calculated with time-history analysis method are bigger.TheIt is suggested that analysis method combining response spectrum with time-history analysis method will be used in seismic design of continuous rigid frame bridges.The results and analysis conclusions provide a reference of seismic analysis to continuous rigid frame bridges.
Taking Sanshui 2nd Bridge as an example,horizontal seismic response of continuous rigid frame bridges with single thin piers was studied.Pile-soil interaction and structure-water interaction were considered,and seismic response affected by different water depths was analyzed.The calculated results indicate that it is detrimental to continuous rigid frame bridges when pile-soil interaction and structure-water interaction are considered.Transverse internal force of bridge piers calculated with response spectrum method is bigger;internal force of main girder and longitudinal internal force of bridge piers calculated with time-history analysis method are bigger.TheIt is suggested that analysis method combining response spectrum with time-history analysis method will be used in seismic design of continuous rigid frame bridges.The results and analysis conclusions provide a reference of seismic analysis to continuous rigid frame bridges.
引文
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[2]周军生,楼庄鸿.大跨径预应力混凝土连续刚构桥的现状和发展趋势[J].中国公路学报,2000,13(1):31-37.ZHOU Jun-sheng,LOU Zhuang-hong.The StatusQuo and Developing Trends of Large-span Pre-stressed Concrete Bridges with Continuous RigidFrame Structure[J].China Journal of Highway andTransport,2000,13(1):31-37.
[3]刘健新,张伟,张茜.洛河特大桥抗震性能计算[J].交通运输工程学报,2006,6(1):57-62.LI UJian-xin,ZHANG Wei,ZHANG Qian.Anti-seis-mic Performance Calculation of Luohe Bridge[J].Journal of Traffic and Transportation Engineering,2006,6(1):57-62.
[4]黄小国,胡大琳,张后举.行波效应对大跨度连续刚构桥地震反应的影响[J].长安大学学报:自然科学版,2008,28(1):72-76.HUANG Xiao-guo,HU Da-lin,ZHANG Hou-ju.Effects of Traveling Wave to Seismic Response ofLong Span Rigid-framed Bridge[J].Journal of Chang’an University:Natural Science Edition,2008,28(1):72-76.
[5]李忠献,黄健,丁阳,等.不同地震激励下大跨度斜拉桥的地震反应分析[J].中国公路学报,2005,18(3):48-53.LI Zhong-xian,HUANGJian,DING Yang,et al.Seis-mic Responses of Long-span Cable-stayed BridgesUnder Different Patterns of Earthquake Excitations[J].China Journal of Highway and Transport,2005,18(3):48-53.
[6]胡亮,李黎,彭元诚,等.大跨桥梁抖振时域分析的程序化方法[J].中国公路学报,2006,19(6):59-64.HU Liang,LI Li,PENG Yuan-cheng,et al.Com-puterized Approachfor Buffeting Ti me-domain Analy-sis of Long-span Bridge[J].China Journal of High-way and Transport,2006,19(6):59-64.
[7]王军文,李建中,范立础.连续梁桥纵向地震碰撞反应参数研究[J].中国公路学报,2005,18(4):42-47.WANG Jun-wen,LI Jian-zhong,FAN Li-chu.Para-metric Study of Longitudinal Seismic Pounding Re-sponse for Continuous Girder Bridges[J].China Jour-nal of Highway and Transport,2005,18(4):42-47.
[8]李国豪.桥梁结构稳定与振动[M].北京:中国铁道出版社,2003:482-592.LI Guo-hao.Stability and Vibration of Bridge Struc-tures[M].Beijing:China Rail way Publishing House,2003:482-592.
[9]范立础.桥梁抗震[M].上海:同济大学出版社,1996:1-75.FAN Li-chu.Bridge Seismic[M].Shanghai:TongjiUniversity Press,1996:1-75.
[10]CHOPRA A K.结构动力学[M].北京:清华大学出版社,2005:507-686.CHOPRA A K.Dynamics of Structures[M].Beijing:Tsinghua University Press,2005:507-686.
[11]张海龙,王超,李健刚,等.水对深水结构动力效应的影响[J].公路,2005(9):6-10.ZHANG Hai-long,WANG Chao,LI Jian-gang,et al.Influence on Dynamic Effect of Structure in DeepWater[J].Highway,2005(9):6-10.
[12]JTJ 024—85,公路桥涵地基与基础设计规范[S].JTJ 024—85,Code for Design of Ground Base andFoundation of Highway Bridges and Culverts[S].
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