考虑土-结构相互作用的能力谱法在铁路桥梁中的应用
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摘要
在FEMA440考虑土-结构相互作用的能力谱法基础上,以客运专线双柱式桥墩为研究对象,选取与我国《铁路工程抗震规范》Ⅱ类场地相符合的80条强震记录,并以此得到具有统计意义的弹性反应谱;利用FEMA440改进等效线性化法对其进行修正,得到考虑土-结构相互作用的修正需求谱;进而利用FEMA440性能点轨迹法求解双柱式桥墩延性需求及性能点,并与80条强震记录非线性时程分析计算结果的平均值进行比较,验证将考虑土-结构相互作用的能力谱法应用于铁路桥梁工程抗震性能评估的可行性。
On the basis of the capacity spectrum method(CSM) put forward in FEMA440 and defined to include soil-structure interaction effects(SSI),with one double-column pier of a passenger dedicated line as the subject of research,eighty records of strong ground motions corresponding to site Ⅱ specified in the Code of Seismic Design for Railway Engineering prevailing in China are selected to calculate the elastic response spectrum.The equivalent linearization method in FEMA440 is used to modify the elasitic response spectrum in order to get the modified demand spectrum which takes into account the soil-structure interaction effects.Depending on the modified acceleration-displacement response spectrum(MADRS) locus of possible performance points,the ductility demand and performance points of the double-column pier are obtained.By comparing with the average value of nonlinear time history analysis results of eighty records of strong ground motions,the feasibility of CSM application in railway bridge aseismic assessment is verified.
On the basis of the capacity spectrum method(CSM) put forward in FEMA440 and defined to include soil-structure interaction effects(SSI),with one double-column pier of a passenger dedicated line as the subject of research,eighty records of strong ground motions corresponding to site Ⅱ specified in the Code of Seismic Design for Railway Engineering prevailing in China are selected to calculate the elastic response spectrum.The equivalent linearization method in FEMA440 is used to modify the elasitic response spectrum in order to get the modified demand spectrum which takes into account the soil-structure interaction effects.Depending on the modified acceleration-displacement response spectrum(MADRS) locus of possible performance points,the ductility demand and performance points of the double-column pier are obtained.By comparing with the average value of nonlinear time history analysis results of eighty records of strong ground motions,the feasibility of CSM application in railway bridge aseismic assessment is verified.
引文
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[3]FAJFAR P.A Nonlinear Analysis Method for Perform-ance-based Seismic Design[J].Earthquake Spectra,2000,16(8):573-592.
[4]CHOPRA A K,GOEL B K.Capacity-Demand-DiagramMethods for Estimating Seismic Deformation of InelasticStructures:SDOF Systems[R].Berkeley:Pacific Earth-quake Engineering Research Center,University of Califor-nia,1999.
[5]王克海.桥梁抗震研究[M].中国铁道出版社,2007,179-192.
[6]王克海,李茜.基于模态分析的Push-over方法在桥梁抗震分析中的应用[J].铁道学报,2006,28(2):79-84.WANG Ke-hai,LI Qian.Mode-based Push-over MethodApplied to Aseismatic Analysis of Bridges[J].Journal ofthe China Railway Society,2006,28(2):79-84.
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[14]谢旭.桥梁结构地震响应分析与抗震设计[M].北京:人民交通出版社,2006:153-263.
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