近场地震动对大跨刚构桥影响的分析
摘要
利用4个台站记录到的近场和远场地震动,研究了钢筋混凝土大跨刚构桥在近场脉冲型地震动横向激励下的反应,并与在远场地震动激励下的反应进行了比较;分析了大跨度桥梁在2种类型地震动作用下的反应特性。结果表明:在相同加速度峰值的地震动作用下,横向激励时,近场脉冲型地震动引起的桥梁反应,均比非脉冲型地震动引起的桥梁反应显著。近场脉冲型地震动激励下,桥梁反应均有较大的增加,对不同的结构部位,其影响规律相似。长周期速度脉冲效应会对大跨桥梁结构产生大的位移冲击,应当重视近场地震动中长周期速度脉冲效应对长周期及柔性结构的影响。
引文
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[11]JTJ004-89,公路工程抗震设计规范[S].
[2]Hall J F,Aagaard B T.Fundamentals of the near-source problem[C]∥Fifth Caltrans Seismic ResearchWorkshop,California Department of Transportation.USA:[s.n.]:1998.
[3]Malhotra P K.Response of building to near-fieldPulse-Like ground motions[J].Earthquake Engineer-ing and Structural Dynamics,1999,28(11):1309-1326.
[4]Abrahamson N A.Near-Fault Ground Motions fromthe 1999 Chi-Chi Earthquake[C]∥Proceeding of U.S.-Japan Workshop on the Effects of Near-FieldEarthquake Shaking.San Francisco:CA,2000.11-13.
[5]Liao W I,Loh C H,Lee B H.Comparison of dynamicresponse of isolated and non-isolated continuous gird-er bridges subjected to near-fault ground motions[J].Engineering Structures,2004,(26):2173-2183.
[6]Housner G W,Hudson D E.The port huenemeearthquake of March 18,1957[J].Bulletin of Seismo-logical Society of America,1958,48(2):163-168.
[7]Orozco G L,Ashford S A.Effects of large velocitypulses on reinforced concrete bridge column[C]∥Pa-cific Earthquake Engineering Research Center.Cali-fornia:University of Berkeley,2002.
[8]Wesolowsky M J,Wilson J C.Seicmic isolation of ca-ble-stayed bridges for near-field ground motions[J].Earthquake Engineering and Structural Dynamics,2003,32(14):2107-2126.
[9]Liao W I,Loh C H,Wan S,et al.Dynamic responsesof bridges subjected to near-fault ground motions[J].Journal of the Chinese Institute of Engineers,2000,23(4):45-64.
[10]王京哲,朱晞.近场地震动脉冲下的反应谱加速度敏感区[J].中国铁道科学,2003,24(6):27-30.
[11]JTJ004-89,公路工程抗震设计规范[S].
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