基于汶川地震的LRB与RB隔震连续梁桥地震响应对比研究
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摘要
为了研究铅芯橡胶支座(LRB)和板式橡胶支座(RB)对连续梁桥地震响应及隔震效果的影响,分别采用Bouc-Wen滞回恢复力模型模拟LRB的力-位移非线性特性,采用直线型恢复力模型模拟RB的本构关系,通过结构离散建立了非隔震、LRB隔震和RB隔震3种连续梁桥的有限元计算模型,运用四阶显式Runge-Kutta迭代法和Newmark时间积分法联合求解增量形式的全桥动力微分方程,并结合算例对3种连续梁桥有限元计算模型分别输入汶川地震波进行非线性时程对比分析。结果表明:LRB在控制梁体与支座位移,降低结构加速度和墩、台底内力响应方面均比RB的效果要显著;采用RB隔震后,梁体与支座的位移响应均较大,在桥梁隔震设计时要予以充分重视。
In order to investigate the seismic response and isolated effect of bridges installing with LRB and RB,Bouc-Wen restoring force model was adopted to simulate the nonlinear hysteric characteristics for LRB,and linear restoring force model is adopted to simulate the constitutive relation for RB FEM computation model considering no isolation,LRB isolation and RB isolation was established by making the structure discrete,both the Newmark and Runge-Kutta iterative strategy were used to solve the increment form's nonlinear governing equation of motion,combining numerical example and input of Wenchuan seismic waves to various FEM computation models the nonlinear time-history contrast analysis was carried out.The resuts indicate that LRB is remarkable effective on controlling beam and bearings displacement,reducing structural acceleration and the internal force at bottom of piers and abutment in comparison with RB;But in case to use RB isolator,the displacement responses of beam and bearings are all larger so attertion should be paid to this in isolation design of bridges
In order to investigate the seismic response and isolated effect of bridges installing with LRB and RB,Bouc-Wen restoring force model was adopted to simulate the nonlinear hysteric characteristics for LRB,and linear restoring force model is adopted to simulate the constitutive relation for RB FEM computation model considering no isolation,LRB isolation and RB isolation was established by making the structure discrete,both the Newmark and Runge-Kutta iterative strategy were used to solve the increment form's nonlinear governing equation of motion,combining numerical example and input of Wenchuan seismic waves to various FEM computation models the nonlinear time-history contrast analysis was carried out.The resuts indicate that LRB is remarkable effective on controlling beam and bearings displacement,reducing structural acceleration and the internal force at bottom of piers and abutment in comparison with RB;But in case to use RB isolator,the displacement responses of beam and bearings are all larger so attertion should be paid to this in isolation design of bridges
引文
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[2]彭天波,李建中,范立础.双曲面球型减隔震支座的开发及应用[J].同济大学学报(自然科学版),2007,35(2):176-180.PENG Tianbo,LI Jianzhong,FAN Lichu.Development and application of double spherical aseismic Bearing[J].Journal of TongJi University(Natural Science).2007,35(2):176-180.
[3]张骏,阎贵平.减隔震支座对梁式桥抗震性能的影响[J].中国公路学报,2002,15(1):38-43.ZHANG Jun,YAN Guiping.Effects of isolation bearing on anti-seismic performance of RC beam bridge[J].China Journal of Highway andTransport,2002,15(1):38-43.
[4]Wen Y K.Method of random vibration of hysteretic systems[J].Journal of Engineering Mechanics Division,1976,102(2):249-263.
[5]Robinson W H.Lead-rubber hysteretic bearings suitable for protecting structures during earthquakes[J].Earthquake Engineering and StructuralDynamics,1982,10(4):593-604.
[6]陈水生,万益春,野田尚昭.隔震桥梁地震响应非线性分析[J].长安大学学报(自然科学版),2006,26(1):54-58.Chen Shuisheng,Wan Yichun,Nao Akinoda.Nonlinear response of isolated bridge subjected to seismic excitation[J].Journal of Chang'an Uni-versity(Natural Science Edition),2006,26(1):54-58.
[7]Jangid R S.Seismic response of isolated bridge[J].Journal of Bridge Engineering,2004,9(2):156-166.
[8]唐光武,李建中,等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.Tang Guangwu,Li Jianzhong,et al.JTG/T B02-01-2008,Guidelines for seismic design of highway bridges[S].Beijing,China Communica-tions Press,2008.
[9]李忠献,林伟,丁阳.大跨度空间网格结构多维多点随机地震反应分析[J].地震工程与工程振动,2006,26(1):56-63.LI Zhongxian,LIN Wei,Ding Yang.Random seismic response analysis of long-span spatial lattice structure under three-dimensional and multi-support earthquake excitations[J].Earthquake Engineering and Engineering Vibration,2006,26(1):56-63.
[10]王丽,阎贵平,孙立.LRB隔震桥梁减震效果分析[J].工程力学,2003,20(5):124-129.WANG Li,YAN Guiping,SUN Li.Analysis of seismic response of isolated bridges with LRB[J].Engineering Mechanics,2003,20(5):124-129.
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