港珠澳大桥的非线性地震响应分析
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摘要
根据隔震连续桥梁的设计特点,利用2个正交的非线性水平弹簧单元来模拟铅芯橡胶支座的双向非线性特性,基于大型有限元软件,合理选取了强震记录作为地震输入,建立了加设隔震支座的港珠澳大桥有限元模型,并进行了强地震动作用下的地震响应分析。分析结果表明:采用减隔震支座后,桥梁结构通过延长自身的自振周期避开了地震的卓越周期;同时依靠减隔震支座的滞回耗能,有效地减少了输入到桥梁结构中的地震能量,降低了桥梁结构的地震响应,使大部分构件处于弹性工作阶段,从而达到保护主体结构的目的。
According to the design features of seismically isolated continuous bridges,the bi-directional nonlinear characteristics of lead rubber bearing are simulated by using two orthogonal nonlinear level spring elements.Based on the finite element software,the analysis models of seismically isolated and non-isolated continuous bridges are established.And the nonlinear seismic response for these analysis models is carried out under the function of the reasonably chosen seismic motion.The analytic results indicate that the natural period of seismically isolated bridge can be prolonged to avoid the principal period of ground,and the seismic energy of structure can be efficiently consumed by the hysteretic energy dissipation of lead rubber bearing.So the response of bridge structure can be reduced to make sure that the most of component work in the elastic phase,and the structure can be well protected.
According to the design features of seismically isolated continuous bridges,the bi-directional nonlinear characteristics of lead rubber bearing are simulated by using two orthogonal nonlinear level spring elements.Based on the finite element software,the analysis models of seismically isolated and non-isolated continuous bridges are established.And the nonlinear seismic response for these analysis models is carried out under the function of the reasonably chosen seismic motion.The analytic results indicate that the natural period of seismically isolated bridge can be prolonged to avoid the principal period of ground,and the seismic energy of structure can be efficiently consumed by the hysteretic energy dissipation of lead rubber bearing.So the response of bridge structure can be reduced to make sure that the most of component work in the elastic phase,and the structure can be well protected.
引文
[1]周福霖,冼巧玲,高向字,等.我国首栋橡胶垫隔震房屋的设计与试验研究[C]//中国建筑学会抗震防灾分会.第三届全国结构减震控制学术研讨会,广州:广州大学,1995:371-390.图11墩53墩底顺桥向弯矩时程反应图
[2]周福霖.工程结构减震控制[M].北京:地震出版社,1997.
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[5]GB 50011—2001,建筑抗震设计规范[S].
[6]叶献国.建筑结构弹塑性地震反应中的能量表达及应用[J].合肥工业大学学报:自然科学版,1998,21(5):9-16.YE Xian-guo.Energy expressions of earthquake re-sponse and damage in elastic structures and applica-tions[J].Journal of Hefei University of Technology:Natural Science,1998,21(5):9-16.
[7]杨喜文,李建中,雷昕戈.多孔大跨度连续梁桥减隔震技术应用研究[J].中国公路学报,2010,23(6):58-65.YANG Xi-wen,LI Jian-zhong,LEI Xin-ge.Researchon application of seismic isolation techniques to multi-ple and large-span continuous girder bridge[J].ChinaJournal of Highway and Transport,2010,23(6):58-65.
[8]刘健新,张伟,张茜.洛河特大桥抗震性能计算[J].交通运输工程学报,2006,6(1):57-62.LIU Jian-xin,ZHANG Wei,ZHANG Xi.Anti-seismicperformance calculation of Luohe big bridge[J].Jour-nal of Traffic and Transportation Engineering,2006,6(1):57-62.
[9]Kwong J,Lindsay R K,Woodworth A J,et al.Applia-cation of base isolation to a single-span bridge in azone with high seismicity[C]//Tansportation Re-search Board.Transportation Fourth InternationalBridge Engineering Conference.San:TransportationResearch Board,1995:79-87.
[2]周福霖.工程结构减震控制[M].北京:地震出版社,1997.
[3]刘保东.工程振动与稳定基础[M].北京:清华大学出版社,2005.
[4]付德宗,何广杰,周灵源.橡胶支座隔震结构弹塑性时程分析[J].四川建筑,2005,25(5):62-66.FU De-zong,HE Guang-jie,ZHOU Ling-yuan.Elas-tic-plastic time history analysis of rubber bearingsbase-isolated structure[J].Sichuan Architecture,2005,25(5):62-66.
[5]GB 50011—2001,建筑抗震设计规范[S].
[6]叶献国.建筑结构弹塑性地震反应中的能量表达及应用[J].合肥工业大学学报:自然科学版,1998,21(5):9-16.YE Xian-guo.Energy expressions of earthquake re-sponse and damage in elastic structures and applica-tions[J].Journal of Hefei University of Technology:Natural Science,1998,21(5):9-16.
[7]杨喜文,李建中,雷昕戈.多孔大跨度连续梁桥减隔震技术应用研究[J].中国公路学报,2010,23(6):58-65.YANG Xi-wen,LI Jian-zhong,LEI Xin-ge.Researchon application of seismic isolation techniques to multi-ple and large-span continuous girder bridge[J].ChinaJournal of Highway and Transport,2010,23(6):58-65.
[8]刘健新,张伟,张茜.洛河特大桥抗震性能计算[J].交通运输工程学报,2006,6(1):57-62.LIU Jian-xin,ZHANG Wei,ZHANG Xi.Anti-seismicperformance calculation of Luohe big bridge[J].Jour-nal of Traffic and Transportation Engineering,2006,6(1):57-62.
[9]Kwong J,Lindsay R K,Woodworth A J,et al.Applia-cation of base isolation to a single-span bridge in azone with high seismicity[C]//Tansportation Re-search Board.Transportation Fourth InternationalBridge Engineering Conference.San:TransportationResearch Board,1995:79-87.
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