行波效应下多联长跨组合结构桥梁地震响应分析
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摘要
以一座全长1855 m的多联长跨组合结构桥梁为背景,建立全桥空间杆系有限元模型,讨论了桩土相互作用简化模式对模型计算结果的影响,利用绝对位移法计算了该桥在多种行波激励工况下的地震响应,研究了激励输入模式、视波速、行波输入方向等因素对组合结构桥梁地震响应的影响规律,并通过计算,探讨了行波效应对多联长跨组合结构桥梁伸缩缝处联间相对位移的影响。研究表明,不同桩土相互作用简化模式对计算结果影响很大;行波效应会使组合结构桥梁结构位移尤其是支座变形及联间相对位移的地震响应增大,设计时应采取相应的改善措施。
This paper presents the results of a study on the seismic response of a 1 855 m long multi-span composite bridge under traveling wave excitation.A nonlinear three-dimensional finite element spatial model of all the bridge was built.The effects of soil-pile interaction on the analysis result of the simplified model were discussed.The effects of the primary factors on the seismic responses of the bridge such as excitation pattern,wave velocity and spreading direction of the earthquake wave were investigated through a parametric study with absolute displacement method.The effects of seismic response at expansion joints under traveling wave excitation were also investigated.The major conclusions are that,the soil-pile interaction is so important that can not be neglected,the traveling-wave effect is generally found to be negative on the seismic responses of bearing deformation and relative displacement between girders,which become larger than that under uniform excitation,and some improvement measures should be taken into account in design.
This paper presents the results of a study on the seismic response of a 1 855 m long multi-span composite bridge under traveling wave excitation.A nonlinear three-dimensional finite element spatial model of all the bridge was built.The effects of soil-pile interaction on the analysis result of the simplified model were discussed.The effects of the primary factors on the seismic responses of the bridge such as excitation pattern,wave velocity and spreading direction of the earthquake wave were investigated through a parametric study with absolute displacement method.The effects of seismic response at expansion joints under traveling wave excitation were also investigated.The major conclusions are that,the soil-pile interaction is so important that can not be neglected,the traveling-wave effect is generally found to be negative on the seismic responses of bearing deformation and relative displacement between girders,which become larger than that under uniform excitation,and some improvement measures should be taken into account in design.
引文
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[4]项海帆.斜张桥在行波效应作用下的地震反应分析[J].同济大学学报,1983,11(2):1-9.Xiang HF.Seismic response analysis for cable stayedbridge under traveling wave effect[J].Journal ofTongji University,1983,11(2):1-9.(in Chinese)
[5]王明晔,叶爱君,胡世德.行波激励下多跨连续梁桥地震反应分析[J].结构工程师,2007,8:49-54.Wang MY,Ye AJ,Hu S D.Seismic response analysisfor multi-span continuous bridges under excitation oftraveling wave[J].Structural Engineers,2007,8:49-54.(in Chinese)
[6]刘爱荣,张俊平,禹奇才,等.多点激励下大跨度连续刚架拱组合桥的空间地震响应分析[J].暨南大学学报,2007(3):246-250.Liu A R,Zhang J P,Yu Q C,et al.Spacial seismicresponse analysis for long span composite bridge ofcontinuous rigid-frame and arch structure under multi-supports excitation[J].Journal of Jinan University,2007(3):246-250.(in Chinese)
[7]Cloughr W,Penzien J.Dynamics of Structures[M].Berkeley:Computers and Structures Inc,1995.
[8]邓育林,彭凯,李建中.地震作用下横向碰撞对连续梁桥地震反应的影响[J].结构工程师,2007,4:64-68.Deng Y L,Peng K,Li J Z.Effect of pounding onseismic responses of continuous girder bridges undertransverse earthquake[J].Structural Engineers,2007,4:64-68.(in Chinese)
[9]杭州九堡大桥结构抗震性能研究报告[R].上海:同济大学土木工程防灾国家重点实验室,2009.Seismic research report of Jiubao bridge in Hangzhou[R].Shanghai:State Key Laboratory for DisasterReduction in Civil Engineering,Tongji University,2009.(in Chinese)
[10]杭州九堡大桥工程场地地震安全性评价报告[R].浙江:浙江省工程地震研究院,2009.Engineering seismic safety evaluation report of Jiubaobridge in Hangzhou[R].Zhejiang:ZhejiangEarthquake Engineering Research Institute,2009.(inChinese)
[2]Brozzetti J.Design development of steel-concretecomposite bridges in France[J].Journal ofConstructional Steel Research,2000,55:229-243.
[3]金成棣.预应力混凝土梁拱组合桥梁———设计研究与实践[M].北京:人民交通出版社,2001.Jin C D.Prestressed concrete arch-girder compositebridge—Design and Practice[M].Beijing:ChinaCommunications Press,2001.(in Chinese)
[4]项海帆.斜张桥在行波效应作用下的地震反应分析[J].同济大学学报,1983,11(2):1-9.Xiang HF.Seismic response analysis for cable stayedbridge under traveling wave effect[J].Journal ofTongji University,1983,11(2):1-9.(in Chinese)
[5]王明晔,叶爱君,胡世德.行波激励下多跨连续梁桥地震反应分析[J].结构工程师,2007,8:49-54.Wang MY,Ye AJ,Hu S D.Seismic response analysisfor multi-span continuous bridges under excitation oftraveling wave[J].Structural Engineers,2007,8:49-54.(in Chinese)
[6]刘爱荣,张俊平,禹奇才,等.多点激励下大跨度连续刚架拱组合桥的空间地震响应分析[J].暨南大学学报,2007(3):246-250.Liu A R,Zhang J P,Yu Q C,et al.Spacial seismicresponse analysis for long span composite bridge ofcontinuous rigid-frame and arch structure under multi-supports excitation[J].Journal of Jinan University,2007(3):246-250.(in Chinese)
[7]Cloughr W,Penzien J.Dynamics of Structures[M].Berkeley:Computers and Structures Inc,1995.
[8]邓育林,彭凯,李建中.地震作用下横向碰撞对连续梁桥地震反应的影响[J].结构工程师,2007,4:64-68.Deng Y L,Peng K,Li J Z.Effect of pounding onseismic responses of continuous girder bridges undertransverse earthquake[J].Structural Engineers,2007,4:64-68.(in Chinese)
[9]杭州九堡大桥结构抗震性能研究报告[R].上海:同济大学土木工程防灾国家重点实验室,2009.Seismic research report of Jiubao bridge in Hangzhou[R].Shanghai:State Key Laboratory for DisasterReduction in Civil Engineering,Tongji University,2009.(in Chinese)
[10]杭州九堡大桥工程场地地震安全性评价报告[R].浙江:浙江省工程地震研究院,2009.Engineering seismic safety evaluation report of Jiubaobridge in Hangzhou[R].Zhejiang:ZhejiangEarthquake Engineering Research Institute,2009.(inChinese)
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