近断层地震动作用下减隔震桥梁空间动力分析
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摘要
采用非线性时程分析法,分析了减隔震桥梁和非减隔震桥梁的三维地震响应。通过对比减隔震桥梁在不同地震动激励下的动力响应,研究了减隔震桥梁承受近断层地震动的响应特性。通过对比减隔震和非减隔震桥梁纵向地震位移,研究了近断层地震动对铅销橡胶支座的减震性能的影响。研究结果表明:与普通地震动激励相比,在近断层长周期脉冲型地震动激励下,减隔震桥梁减震率由54.4%降低为18.3%,隔震支座的减震效果降低了;在近断层脉冲地震动作用下,减隔震桥梁梁体纵向位移为179.6mm,非减隔震桥梁为151.6mm,铅销橡胶支座增大了梁体的纵向位移,易造成相邻梁体的碰撞或落梁,因此,近断层地区桥梁不宜采用铅销橡胶支座隔震。
With nonlinear dynamic time-history method,3D dynamic responses of isolated bridge and non-isolated bridge were analyzed.Through comparing the dynamic responses of isolate bridge under the excitations of earthquakes with different frequency spectrums,the dynamic characteristic of isolated bridge was studied.Through comparing the longitudinal responses of isolated bridge with non-isolated bridge,the influence of near-fault ground motions on the seismic absorption ability of LRB(lead rubber bearing) was investigated.The result indicates that in contrast with common ground motion,the ratio of seismic absorption decreases from 54.4% to 18.3%,and the absorption effect of LRB reduces under near-fault ground motion.The longitudinal displacements of girders for isolated bridge and non-isolated bridge are 179.6 mm and 151.6 mm respectively.Obviously,LRB enlarges the displacement of girder and easily makes girder collide and fall,so LRB is not suitable isolated device for the bridges near fault area.3 tabs,12 figs,13 refs.
With nonlinear dynamic time-history method,3D dynamic responses of isolated bridge and non-isolated bridge were analyzed.Through comparing the dynamic responses of isolate bridge under the excitations of earthquakes with different frequency spectrums,the dynamic characteristic of isolated bridge was studied.Through comparing the longitudinal responses of isolated bridge with non-isolated bridge,the influence of near-fault ground motions on the seismic absorption ability of LRB(lead rubber bearing) was investigated.The result indicates that in contrast with common ground motion,the ratio of seismic absorption decreases from 54.4% to 18.3%,and the absorption effect of LRB reduces under near-fault ground motion.The longitudinal displacements of girders for isolated bridge and non-isolated bridge are 179.6 mm and 151.6 mm respectively.Obviously,LRB enlarges the displacement of girder and easily makes girder collide and fall,so LRB is not suitable isolated device for the bridges near fault area.3 tabs,12 figs,13 refs.
引文
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[6]廖文义,罗俊雄,万绚.隔震桥梁承受近断层地震之反应分析[J].地震工程与工程振动,2001,21(4):102-108.LI AO Wen-i,LOH Chin-hsiung,WAN Shiuan.Responses of isolated bridges subjectedto near-fault ground motions[J].Earthquake Engineering and Engineering Vibration,2001,21(4):102-108.(in Chinese)
[7]李爽,谢礼立.近场脉冲型地震动对钢筋混凝土框架结构影响[J].沈阳建筑大学学报:自然科学版,2006,22(3):406-410.LI Shuang,XIE Li-li.Effects of near-field pulse-like groundmotions on reinforced concrete frame structures[J].Journal of Shenyang Jianzhu University:Natural Science,2006,22(3):406-410.(in Chinese)
[8]杨迪雄,李刚,程耿东.近断层脉冲型地震动作用下隔震结构地震反应分析[J].地震工程与工程振动,2005,25(2):119-124.YANG Di-xiong,LI Gang,CHENG Geng-dong.Seismic response of base-isolated structure subjected to near-fault pulse-like ground motions[J].Earthquake Engineering and Engineering Vibration,2005,25(2):119-124.(in Chinese)
[9]倪永军,朱[2].近断层地震的加速度峰值比和反应谱分析[J].北方交通大学学报,2004,28(4):1-5.NI Yong-jun,Zhu Xi.Analysis of acceleration peak ratios and response spectra for near-fault earthquakes[J].Journal of Northern Jiaotong University,2004,28(4):1-5.(in Chinese)
[10]薛晓锋,胡兆同,刘健新.功能分离式桥梁减震支座[J].长安大学学报:自然科学版,2005,25(1):33-36.XUE Xiao-feng,HU Zhao-tong,LI U Jian-xin.Integrated isolation bearing of bridge[J].Journal of Chang an University:Natural Science Edition,2005,25(1):33-36.(in Chinese)
[11]刘健新.公路桥梁减震装置及设计方法研究[R].西安:长安大学,2000.LI UJian-xin.Study on design method and divices for seismic absorption of highway bridges[R].Xi an:Chang an University,2000.(in Chinese)
[12]刘健新,胡兆同,李子青.桥梁结构减震设计方法研究[J].中国公路学报,2000,13(2):73-75,79.LI UJian-xin,HU Zhao-tong,LI Zi-qing.Design method for seismic absorption of bridge structures[J].China Journal of Highway and Transport,2000,13(2):73-75,79.(in Chinese)
[13]于泳波.减隔震桥梁的空间动力分析及动力试验[D].西安:长安大学,2004.YU Yong-bo.3-di mension dynamic analysis of isolation bridge and dynamic testing[D].Xi an:Chang an University,2004.(in Chinese)
[2]吴迪,罗奇峰,罗永峰.长周期地震波的研究进展[J].地震研究,2007,30(3):296-302.WU Di,LUO Qi-feng,LUO Yong-feng.Development of long-period seismic wave research[J].Journal of Seismological Research,2007,30(3):296-302.(in Chinese)
[3]李爽,谢礼立.近场问题的研究现状与发展方向[J].地震学报,2007,29(1):102-111.LI Shuang,XIE Li-li.Progress and trend on near-field prob-lems in civil engineering[J].Acta Seismologica Sinica,2007,29(1):102-111.(in Chinese)
[4]刘启方,袁一凡,金星,等.近断层地震动的基本特征[J].地震工程与工程振动,2006,26(1):1-10.LI U Qi-fang,YUAN Yi-fan,JI N Xing,et al.Basic charac-teristics of near-fault ground motion[J].Earthquake Engineering and Engineering Vibration,2006,26(1):1-10.(in Chinese)
[5]李新乐,窦慧娟,彭永恒,等.基于近断层地震的桥梁结构抗震设计研究进展[J].大连民族学院学报,2007(3):57-59.LI Xin-le,DOU Hui-juan,PENG Yong-heng,et al.Research development on seismic design for bridge structure under near-fault earthquake[J].Journal of Dalian Nationalities University,2007(3):57-59.(in Chinese)
[6]廖文义,罗俊雄,万绚.隔震桥梁承受近断层地震之反应分析[J].地震工程与工程振动,2001,21(4):102-108.LI AO Wen-i,LOH Chin-hsiung,WAN Shiuan.Responses of isolated bridges subjectedto near-fault ground motions[J].Earthquake Engineering and Engineering Vibration,2001,21(4):102-108.(in Chinese)
[7]李爽,谢礼立.近场脉冲型地震动对钢筋混凝土框架结构影响[J].沈阳建筑大学学报:自然科学版,2006,22(3):406-410.LI Shuang,XIE Li-li.Effects of near-field pulse-like groundmotions on reinforced concrete frame structures[J].Journal of Shenyang Jianzhu University:Natural Science,2006,22(3):406-410.(in Chinese)
[8]杨迪雄,李刚,程耿东.近断层脉冲型地震动作用下隔震结构地震反应分析[J].地震工程与工程振动,2005,25(2):119-124.YANG Di-xiong,LI Gang,CHENG Geng-dong.Seismic response of base-isolated structure subjected to near-fault pulse-like ground motions[J].Earthquake Engineering and Engineering Vibration,2005,25(2):119-124.(in Chinese)
[9]倪永军,朱[2].近断层地震的加速度峰值比和反应谱分析[J].北方交通大学学报,2004,28(4):1-5.NI Yong-jun,Zhu Xi.Analysis of acceleration peak ratios and response spectra for near-fault earthquakes[J].Journal of Northern Jiaotong University,2004,28(4):1-5.(in Chinese)
[10]薛晓锋,胡兆同,刘健新.功能分离式桥梁减震支座[J].长安大学学报:自然科学版,2005,25(1):33-36.XUE Xiao-feng,HU Zhao-tong,LI U Jian-xin.Integrated isolation bearing of bridge[J].Journal of Chang an University:Natural Science Edition,2005,25(1):33-36.(in Chinese)
[11]刘健新.公路桥梁减震装置及设计方法研究[R].西安:长安大学,2000.LI UJian-xin.Study on design method and divices for seismic absorption of highway bridges[R].Xi an:Chang an University,2000.(in Chinese)
[12]刘健新,胡兆同,李子青.桥梁结构减震设计方法研究[J].中国公路学报,2000,13(2):73-75,79.LI UJian-xin,HU Zhao-tong,LI Zi-qing.Design method for seismic absorption of bridge structures[J].China Journal of Highway and Transport,2000,13(2):73-75,79.(in Chinese)
[13]于泳波.减隔震桥梁的空间动力分析及动力试验[D].西安:长安大学,2004.YU Yong-bo.3-di mension dynamic analysis of isolation bridge and dynamic testing[D].Xi an:Chang an University,2004.(in Chinese)
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