基于功率谱法分析场地效应对大跨度连续刚构桥的影响
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摘要
以一座全长为346 m的预应力混凝土连续刚构桥为基础,建立全桥计算模型,采用由规范反应谱生成的相应的功率谱,分6种工况对桥梁进行激励;通过多点激励与一致激励的对比,分析了场地效应对连续刚构桥的影响。结果表明:对于高墩大跨度连续刚构桥,场地效应主要对跨中截面不利,并使桥墩墩底内力产生突变。
A computing model of the entire bridge was established based on a prestressed concrete continuous rigid framed bridge,which was 346m.The bridge was to be excited under six working conditions respectively using the power spectrum generated from standard response spectrum.By compared multi-support excitation with uniform excitation,this essay analyses the influence of site effect on continuous rigid framed bridge.The research result indicates that for continuous rigid framed bridge of high piers and long span,site effect is mainly disadvantageous to the mid-span cross-section of girders,and can cause a abrupt change of internal force of the bottom of piers.
A computing model of the entire bridge was established based on a prestressed concrete continuous rigid framed bridge,which was 346m.The bridge was to be excited under six working conditions respectively using the power spectrum generated from standard response spectrum.By compared multi-support excitation with uniform excitation,this essay analyses the influence of site effect on continuous rigid framed bridge.The research result indicates that for continuous rigid framed bridge of high piers and long span,site effect is mainly disadvantageous to the mid-span cross-section of girders,and can cause a abrupt change of internal force of the bottom of piers.
引文
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[11]JTG/TB 02-01—2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.
[2]李建俊,林家浩,张文首,等.大跨度结构受多点随机地震激励的响应[J].计算结构力学及其应用,1995,12(4):445-450.LI Jian-jun,LIN Jia-hao,ZHANG Wen-shou,et al.Responses oflong-span structures subjected to arbitrarily coherent multi-pointstationary random seismic excitation[J].Computational StructuralMechanics and Applications,1995,12(4):445-450.
[3]林家浩,张亚辉,赵岩.大跨度结构抗震分析方法及近期进展[J].力学进展,2001,31(3):350-360.LIN Jia-hao,ZHANG Ya-hui,ZHAO Yan.Anti-seismic analysismethods and recent advances of long-span structures[J].Advancesin Mechanics,2001,31(3):350-360.
[4]赵岩.桥梁抗震的线性/非线性分析方法研究[D].大连:大连理工大学,2003.
[5]范立础,王君杰,陈玮.非一致地震激励下大跨度斜拉桥的响应特征[J].计算力学学报,2001,18(3):358-363.FAN Li-chu,WANG Jun-jie,Chen Wei.Response characteristicsof long span cable-stayed bridges under non-uniform seismic action[J].Chinese Journal of Computational Mechanics,2001,18(3):358-363.
[6]陈幼平,周宏业.斜拉桥地震破坏的计算研究[J].地震工程与工程振动,1995,15(3):127-134.CHEN You-ping,ZHOU Hong-ye.Seismic damage and collapse ofcable-stayed bridges[J].Earthquake Engineering and EngineeringVibration,1995,15(3):127-134.
[7]赵灿晖,周志祥.大跨度上承式钢管砼拱桥的地震响应分析[J].重庆交通大学学报:自然科学版,2007,26(5):1-4.ZHAO Can-hui,ZHOU Zhi-xiang.Seismic response analysis oflong span CFST deck-type arch bridges[J].Journal of ChongqingJiaotong University:Natural Science,2007,26(5):1-4.
[8]单德山,李乔.高墩深水大跨度连续刚构桥非一致地震响应分析[J].重庆交通大学学报:自然科学版,2008,27(4):499-501.SHAN De-shan,LI Qiao.Seismic response analysis of long-spancontinuous rigid-framed bridge with high-rise piers in deep waterunder non-uniform seismic excitation[J].Journal of ChongqingJiaotong University:Natural Science,2008,27(4):499-501.
[9]林家浩,张亚辉.随机振动的虚拟激励法[M].北京:科学出版社,2004.
[10]张亚辉,陈艳,李丽媛,等.桥梁抗震随机响应分析及输入功率谱研究[J].大连理工大学学报,2007,47(6):786-792.ZHANG Ya-hui,CHEN Yan,LI Li-yuan,et al.Seismic randomvibration of bridges and input power spectrum analysis[J].Journalof Dalian University of Technology,2007,47(6):786-792.
[11]JTG/TB 02-01—2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.
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