一致激励下的混凝土斜拉桥振动台试验
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
以某一典型中等跨径混凝土斜拉桥为研究对象,设计了1∶20大比例振动台全桥试验模型.采用Chi-Chi波和场地人工波进行了纵、横桥向小幅四台阵全桥振动台试验,并对该试验模型进行了场地人工波输入下的横桥向破坏性试验.试验结果表明:纵桥向输入时,由于Chi-Chi波长周期丰富,激起结构反应较大;横桥向输入时,两条波的频谱特性在结构横向周期附近基本相同,故激起结构反应相差不大;结构在场地人工波1.3g横桥向输入时,桥塔上横梁主筋断裂、混凝土大面积剥落、发生明显破坏,上横梁与塔柱之间形成的塑性铰导致桥塔的框架效应明显削弱,桥塔得到了有效保护,达到了试验预期目标.
A1∶20 scale model of a typical mid-span concrete cable-stayed bridge was designed,constructed and tested on 4shake tables in longitudinal and transverse directions,respectively,first with minor excitations of Chi-Chi wave and then with site specific artificial wave.The destructive behavior was observed with much severe transverse shaking of site specific artificial wave.The experimental results showed that the bridge responses which were excited by the long-period Chi-Chi wave were larger under longitudinal earthquake input,but the structure responses which were excited by ChiChi wave and site specific artificial wave were similar under transverse earthquake input because the two wave spectrum characteristics concerned were basically identical.Under the transverse site specific artificial wave input with PGA approaching 1.3g,the upper beams of the tower were obviously damaged including the fracture of longitudinal reinforcement and concrete spalling in a large area,which formed the plastic hinges between the upper tower column and the tower upper beam,therefore the tower base were effectively protected owing to this weakened framing effect.
引文
[1]Godden W G,Aslam M.Dynamic model studies of Ruck-AChucky bridge[J].Journal of the Structural Division,1978,104(12):1827.
    [2]Garevski M A,Brownjohn J M W,Blackborough A,et al.Resonance-search tests on a small-scale model of a cable-stayed bridge[J].Engineering Structures,1991,13(1):59.
    [3]YANG Chengyu.Seismic analysis of long span bridges including the effects of spatial variation of seismic waves on bridges[D].Hong Kong:The Hong Kong University of Science and Technology,2007.
    [4]房贞政,张超,陈永健,等.基于三台阵振动台的多塔斜拉桥试验研究[J].土木工程学报,2012,45(增1):25.FANG Zhenzheng,ZHANG Chao,CHEN Yongjian,et al.Research on the shaking table test of three towers cable-stayed bridge based on three shaking table system[J].China Civil Engineering Journal,2012,45(Suppl.1):25.
    [5]段昕智.强震作用下斜拉桥桥塔纵桥向振动台试验研究[D].上海:同济大学,2012.DUAN Xinzhi.Experimental study on seismic performance of cable-stayed bridge tower subjected to longitudinal strong ground motions[D].Shanghai:Tongji University,2012.
    [6]重庆交通科研设计院.JTG/T B02-01—2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.Chongqing Communications Research and Design Institute.JTG/T B02-01—2008 Guidelines for seismic design of highway bridges[S].Beijing:China Communications Press,2008.
    [7]中华人民共和国住房与城乡建设部.CJJ 166—2011城市桥梁抗震设计规范[S].北京:中国建筑工业出版社,2011.Ministry of Housing and Urban-Rural Construction of the People's Republic of China.CJJ 166—2011 Code for seismic design of urban bridges[S].Beijing:China Architecture&Building Press,2001.
    [8]Lee G C.Traveling wave effect on the seismic response of a steel arch bridge subjected to near fault ground motions[J].Earthquake Engineering and Engineering Vibration,2007,6(3):245.
    [9]Goel R K,Chopra A K.Nonlinear analysis of ordinary bridges crossing fault-rupture zones[J].Journal of Bridge Engineering,2009,14(3):216.
    [10]Somerville P G.Characterizing near fault ground motion for the design and evaluation of bridges[EB/OL].[2014-05-10].http://peer.berkeley.edu/research/peertestbeds/Hbt/PaperonNearFaultGroundMotion.pdf.
    [11]Chang K C,Mo Y L,Chen C C,et al.Lessons learned from the damaged Chi-Lu cable-stayed bridge[J].Journal of Bridge Engineering,2004,9(4):343.
    [12]徐艳,段昕智,李建中.强震作用下斜拉桥纵桥向非线性地震反应分析[J].华南理工大学学报:自然科学版,2012,40(6):132.XU Yan,DUAN Xinzhi,LI Jianzhong.Analysis of nonlinear seismic response of cable-stayed bridge subjected to longitudinal strong ground motions[J].Jounal of Journal of South China University of Technology:Natural Science Edition,2012,40(6):132.
    [13]焦驰宇.基于性能的大跨斜拉桥地震易损性分析[D].上海:同济大学,2008.JIAO Chiyu.Performance based seismic fragility analysis of long-span cable-stayed bridges[D].Shanghai:Tongji University,2008.
    [14]周颖,吕西林.建筑结构振动台模型试验方法与技术[M].北京:科学出版社,2012.ZHOU Ying,LXilin.Method and technology for shaking table model test of building structures[M].Beijing:Science Press,2012.
    [15]Anil C K.Dynamics of structures:Theory and applications to earthquake engineering[M].New York:Prentice Hall,2012.
    [16]焦驰宇,李建中,彭天波.塔梁连接方式对大跨斜拉桥地震反应的影响[J].振动与冲击,2009,28(10):179.JIAO Chiyu,LI Jianzhong,PENG Tianbo.Effects of different connecting styles between towers and deck on seismic responses of a long-span cable-stayed bridge[J].Journal of Vibration and Shock,2009,28(10):179.

版权所有:© 2023 中国地质图书馆 中国地质调查局地学文献中心