考虑土-结构相互作用的LRB隔震梁桥体系地震反应分析法
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摘要
为了研究在双向地震激励下,考虑土一结构相互作用的LRB隔震梁桥结构体系的反应特性以及不同类型土对其隔震梁桥地震反应峰值的影响.采用集中参数法,给出了双向水平地震激励下考虑SSI的一种时域计算分析隔震桥梁地震反应的方法.并在考虑和忽略SSI时,对一座三跨连续LRB隔震梁桥的地震反应峰值的影响进行了比较分析,结果证实,土-结构相互作用对LRB隔震梁桥结构地震反应与场面类别、断层以及地震动选择等关系密切.
In order to investigate the effect of soil-structure interaction(SSI)on the earthquake characteristics,and the foundation pier effect of the soil surrounding on peak response of the continuous girder seismically isolated bridge with lead rubber bearings(LRB)under bi-directional earthquake excitation.An analytical method of earthquake-response is carried out in time domain using complex modal analysi,and the peak responses of a three-span continuous girder seismically isolated bridge are compared with consideration or ignorance of SSI effect.A parametric study is also conducted to investigate the effect of bearing parameters on the response of isolated bridge system.It has important effects of SSI on the earthquake response of continuous girder seismically isolated bridges.
In order to investigate the effect of soil-structure interaction(SSI)on the earthquake characteristics,and the foundation pier effect of the soil surrounding on peak response of the continuous girder seismically isolated bridge with lead rubber bearings(LRB)under bi-directional earthquake excitation.An analytical method of earthquake-response is carried out in time domain using complex modal analysi,and the peak responses of a three-span continuous girder seismically isolated bridge are compared with consideration or ignorance of SSI effect.A parametric study is also conducted to investigate the effect of bearing parameters on the response of isolated bridge system.It has important effects of SSI on the earthquake response of continuous girder seismically isolated bridges.
引文
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[2]林皋，栾茂田，陈怀海．土-结构相互作用对高层建筑非线性地震反应的影响[J]．土木程学报，1993，26(4)：1-13．LIN Gao,LUAN Mao-tian,CHEN Huai-hai.Soil-structure interaction effect on the nonlinear seismic response of high-rise building[J].China Civil Engineering Journal,1993,26(4):1-13.(in Chinese)
[3]CONSTANTINOU M C,KNELFATI M.Dynamics of soil-base-isolated-structure systems[J].J Struc Engrg ASCE,1998, 114(1):211-221.
[4]李海岭，葛修润．土-结构相互作用对基础隔震体系的影响[J]．土木工程学，2001，34(4)：83-87．LI Hai-ling,GE Xiu-run.Effcet of soil-structure interaction on base-isolated building system[J].China Civil Engineering Journal,2001,34(4):83-87.(in Chinese)
[5]SPYRAKOS C C.Assessment of SSI on the longitudinal seismic response of short span bridges[J].Eng Struct,1990,12: 60-65.
[6]SPYRAKOS C C.Seismic behaviour of bridge piers including soil structure interaction[J].Comput Struct,1992,43:373- 384.
[7]ZHANG J,MAKRIS N.Seismic response analysis of highway overcrossings including soil-structure interaction[J]. Earthquake Eng Struct Dyn,2002,31:1967-1991.
[8]ZHANG J,MAKRIS N.Kinematic response functions and dynamic stiffnesses of bridge embankments[J].Earthquake Eng Struet Dyn,2002,31:1933-1966.
[9]CHAUDHARY M T A,ABE M,FUJINO Y.Identification of soil-structure interaction effect in base-isolated bridges from earthquake records[J].Soil Dynamics and Earthquake Engineering,2001,21:713-725.
[10]PENZIENJ,SCHEFFEY C F,PARMELEE R A,et al.Seismic analysis of bridges on long piles[J].Eng Meeh Div ASCE.1964.90(EM3):223-253.
[11]李永梅，孙国富，王松涛．桩-土-杆系结构动力相互作用[J]．建筑结构学报，2002，23(1)：75-81．LI Yong-mei,SUN Guo-fu,WANG Song-tao.Dynamic interaction of pile-soil-frame structure[J].Journal of Building Structures,2002,23(1):75-81.(in Chinese)
[12]WOF J P.Spring-dashpot-mass mode for foundation vibrations[J].Earthquake Engng Struct Dyn,1997,26(9):31-49.
[13]PARK Y J,WEN Y K,ANG A H S.Random vibration of hysteretic systems under hi-directional motions[J].Earthquake Eng Struct Dyn,1986,14(4):543-557.
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