基于能量法的铅芯橡胶支座隔震桥梁设计方法
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摘要
依据能量平衡原理,建立隔震桥梁系统能量反应方程,将桥墩与铅芯橡胶支座串联,构建隔震桥梁能量反应的双线性分析模型。结合现行《铁路工程抗震规范》,合理选取40条强震记录作为地震输入,对不同周期的隔震桥梁系统进行非线性地震能量反应时程分析。结合铅芯橡胶支座本身的动力特性,给出具有统计意义的适用于I类场地的桥梁隔震设计地震输入总能量谱。提出以地震输入隔震桥梁系统的能量达到铅芯橡胶支座的极限耗能作为破坏准则、由地震输入总能量谱得到地震输入能量、隔震度作为隔震目标、隔震支座位移延性比作为限制条件的减隔震桥梁设计方法。
The energy response equations of the seismically isolated bridge system are established based on the energy equilibrium theory.Bilinear analysis model of the energy response of the seismically isolated bridge is constructed by series connecting the bridge piers and the lead rubber bearings.According to the applicable Code of Seismic Design for Railway Engineering,forty strong ground motion records are appropriately selected as the seismic input and the nonlinear time history analyses for the seismic energy responses of the bilinear SDOF seismically isolated bridge systems with different natural periods are carried out.Then according to the dynamic characteristics of the lead rubber bearing itself,the statistical seismic input energy spectra for the bridge seismic isolation design in Ⅰ-type site are presented.Considering the seismic isolation bridge system input energy reaching to the utmost energy dissipation of the lead rubber bearing as the damage rule,and the seismic input energy acquired from seismic input energy spectra of this paper,and the seismic isolation degree taken as the isolation object as well as the ratio of displacement ductility of the isolation bearing taken as the restricted conditions,the design method of seismic isolation bridge is put forward.
The energy response equations of the seismically isolated bridge system are established based on the energy equilibrium theory.Bilinear analysis model of the energy response of the seismically isolated bridge is constructed by series connecting the bridge piers and the lead rubber bearings.According to the applicable Code of Seismic Design for Railway Engineering,forty strong ground motion records are appropriately selected as the seismic input and the nonlinear time history analyses for the seismic energy responses of the bilinear SDOF seismically isolated bridge systems with different natural periods are carried out.Then according to the dynamic characteristics of the lead rubber bearing itself,the statistical seismic input energy spectra for the bridge seismic isolation design in Ⅰ-type site are presented.Considering the seismic isolation bridge system input energy reaching to the utmost energy dissipation of the lead rubber bearing as the damage rule,and the seismic input energy acquired from seismic input energy spectra of this paper,and the seismic isolation degree taken as the isolation object as well as the ratio of displacement ductility of the isolation bearing taken as the restricted conditions,the design method of seismic isolation bridge is put forward.
引文
[1]SONG T T,DARGUSH G F.Passive Energy Dissipation Systems in Structural Engineering[M].USA:John Wiley&Sons,1997.
[2]熊仲明,史庆轩,李菊芳.框架结构基于能量地震反应分析及设计方法的理论研究[J].世界地震工程,2005,21(2):141-146.(XIONG Zhongming,SHI Qingxuan,LI Jufang.Theoretical Study on Seismic Response and Design Method ofFrame Structures with Energy Method[J].World Earthquake Engineerng,2005,21(2):141-146.in Chinese)
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[10]吴彬,庄军生.铅芯橡胶支座力学性能及其在桥梁工程中减、隔震应用研究[J].中国铁道科学,2004,25(4):137-139.(WU Bin,ZHUANG Junsheng.Study on Mechanical Characteristics of Lead-Rubber Bearing and Its Application forShock Reduction/Isolation in Bridge Engineering[J].China Railway Science,2004,25(4):137-139.in Chinese)
[11]钟铁毅,杨风利,吴彬.铅芯橡胶支座隔震铁路简支梁桥双向地震响应分析[J].中国铁道科学,2007,28(3):38-43.(ZHONG Tieyi,YANG Fengli,WU Bin.Analysis of the Bidirectional Seismic Responses for Seismically IsolatedRailway Simple Supported Beam Bridge by Lead Rubber Bearing[J].China Railway Science,2007,28(3):38-43.in Chinese)
[12]杨风利.铁路桥梁减隔震设计方法及设计参数研究[D].北京:北京交通大学,2007.
[13]MIRANDA E.Nonlinear Response Spectra for Earthquake Resistant Design[C]//Proc.10th WCEE,Madrid,Balkema,Rotterdam:I-AEE,1992,10:5835-5840.
[14]MAHMOUD M,BISPEC H.Interactive Software for the Computation of Unidirectional and Bidirectional NonlinearEarthquake Spectra[C]//Proceedings of the 2004 Structures Congress,Nashville,Tennessee,2004:1-12.ByGEORGE E Blandford(Editor).
[15]北村春幸.基于性能设计的建筑振动解析[M].裵星洙,廖红建,张立,译.西安:西安交通大学出版社,2003.
[16]SINNER R I,ROBINSON W H,MEVERRY G H.工程隔震概论[M].谢礼立,周雍年,赵兴权,译.北京:地震出版社,1996.
[17]American Association of State Highway Officials.Guide Specifications for Seismic Isolation Design[S].Washington(DC):American Association of State Highway Officials,1999.
[2]熊仲明,史庆轩,李菊芳.框架结构基于能量地震反应分析及设计方法的理论研究[J].世界地震工程,2005,21(2):141-146.(XIONG Zhongming,SHI Qingxuan,LI Jufang.Theoretical Study on Seismic Response and Design Method ofFrame Structures with Energy Method[J].World Earthquake Engineerng,2005,21(2):141-146.in Chinese)
[3]周云,周福霖.耗能减震体系的能量设计方法[J].世界地震工程,1997,13(4):7-13.(ZHOU Yun,ZHOU Fulin.Energy Design Method for Structural System with Energy Dissipative Devices[J].World Information on Earthquake Engineerng,1997,13(4):7-13.in Chinese)
[4]魏新磊.耗能减震结构能量设计方法[D].天津:天津大学,2003.
[5]江辉,朱②.脉冲型地震动模拟与隔震桥墩性能的能量分析[J].北方交通大学学报,2004,28(4):6-11.(JIANG Hui,ZHU Xi.Simulation of Pulse-Type Earthquake Excitation and Energy Performance of Isolated BridgePiers[J].Journal of Northern Jiaotong University,2004,28(4):6-11.in Chinese)
[6]MICHEL B,WANG N.Some Aspects of Energy Methods for the Inelastic Seismic Response of Ductile SDOF Struc-tures[J].Engineering Structures,1996,18(1):1-12.
[7]DECANINI L D,FBRIZIO M N.An Energy-Based Methodology for the Assessment of Seismic Demand[J].SoilDynamics and Earthquake Engineering,2001,21:113-137.
[8]李菊芳.建筑结构基于能量的地震反应分析及设计方法[D].西安:西安建筑科技大学,2004.
[9]王常峰.隔震桥梁地震反应及非迭代设计方法研究[D].兰州:兰州铁道学院,2002.
[10]吴彬,庄军生.铅芯橡胶支座力学性能及其在桥梁工程中减、隔震应用研究[J].中国铁道科学,2004,25(4):137-139.(WU Bin,ZHUANG Junsheng.Study on Mechanical Characteristics of Lead-Rubber Bearing and Its Application forShock Reduction/Isolation in Bridge Engineering[J].China Railway Science,2004,25(4):137-139.in Chinese)
[11]钟铁毅,杨风利,吴彬.铅芯橡胶支座隔震铁路简支梁桥双向地震响应分析[J].中国铁道科学,2007,28(3):38-43.(ZHONG Tieyi,YANG Fengli,WU Bin.Analysis of the Bidirectional Seismic Responses for Seismically IsolatedRailway Simple Supported Beam Bridge by Lead Rubber Bearing[J].China Railway Science,2007,28(3):38-43.in Chinese)
[12]杨风利.铁路桥梁减隔震设计方法及设计参数研究[D].北京:北京交通大学,2007.
[13]MIRANDA E.Nonlinear Response Spectra for Earthquake Resistant Design[C]//Proc.10th WCEE,Madrid,Balkema,Rotterdam:I-AEE,1992,10:5835-5840.
[14]MAHMOUD M,BISPEC H.Interactive Software for the Computation of Unidirectional and Bidirectional NonlinearEarthquake Spectra[C]//Proceedings of the 2004 Structures Congress,Nashville,Tennessee,2004:1-12.ByGEORGE E Blandford(Editor).
[15]北村春幸.基于性能设计的建筑振动解析[M].裵星洙,廖红建,张立,译.西安:西安交通大学出版社,2003.
[16]SINNER R I,ROBINSON W H,MEVERRY G H.工程隔震概论[M].谢礼立,周雍年,赵兴权,译.北京:地震出版社,1996.
[17]American Association of State Highway Officials.Guide Specifications for Seismic Isolation Design[S].Washington(DC):American Association of State Highway Officials,1999.
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