考虑土-结构相互作用的核电站安全壳结构地震易损性分析

硕士学位论文考虑土-结构相互作用的核电站安全壳结构地震易损性分析SEISMICFRIGILITYANALYSISOFNUCLEARPOWERPLANTCONTAINMENTCONSIDERINGSOIL-STRUCTUREINTERACTION杨松哈尔滨工业大学2012年7月国内图书分类号：TU352.1TU378.8学校代码：10213国际图书分类号：624密级：公开工学硕士学位论文考虑土-结构相互作用的核电站安全壳结构地震易损性分析硕士研究生：杨松导师：谢礼立教授副导师：翟长海教授申请学位：工学硕士学科：结构工程所在单位：土木工程学院答辩日期：2012年7月授予学位单位：哈尔滨工业大学ClassifiedIndex:TU352.11TU378.8U.D.C.:624DissertationfortheMasterDegreeinEngineeringSEISMICFRIGILITYANALYSISOFNUCLEARPOWERPLANTCONTAINMENTCONSIDERINGSOIL-STRUCTUREINTERACTIONCandidate:YangSongSupervisor:Prof.XieLiliViceSupervisor:Prof.ZhaiChanghaiAcademicDegreeAppliedfor:MasterofEngineeringSpeciality:StructuralEngineeringAffiliation:SchoolofCivilEngineeringDateofDefence:July,2012Degree-Conferring-Institution:HarbinInstituteofTechnology哈尔滨工业大学工学硕士学位论文I摘要核电站安全壳是防止核泄漏的最后屏障，其地震安全性具有极其重要的意义。本文利用有限元分析平台SAP2000和OpenSees对安全壳进行了考虑土-结构相互作用(SSI)的地震易损性分析和研究，完成的工作和获得的主要结论有：（1）在精细化模型数值模拟的基础上，对现有的集中质量模型的恢复力模型进行了改进，对模型进行了验证。在安全壳结构地震易损性分析中考虑了土-结构相互作用的影响，土体采用的集8参数模型考虑了土体质量的影响，分析精度较高。（2）分别进行基于蒙特卡洛法的易损性分析和基于响应面法的地震易损性分析，得到了安全壳结构考虑土-结构相互作用的地震易损性曲线。引入了一种对非线性时程分析结果进行处理的数学方法，大大减少了蒙特卡洛模拟的工作量。通过对易损性结果的分析，发现易损性计算依赖于所选的破坏指标。本文提出，宜选择顶点位移作为破坏指标，这样更能体现结构延性带来的积极作用。（3）通过对两种易损性分析方法所得结果的比较，发现二者的易损性曲线比较一致。同时也验证了改进模型的正确性。安全壳结构基频很高，考虑土-结构相互作用后，结构整体刚度下降，频率减小，结构失效概率增大，因此SSI效应不可忽略。关键词：安全壳；地震易损性；土-结构相互作用；恢复力模型；蒙特卡洛法；响应面法哈尔滨工业大学工学硕士学位论文IIAbstractContainmentisthelastbarriertopreventleakageofthenuclearpowerplant,henceitsseismicsafetyisofmuchimportantsignificance.Thispaperhasanalyzedtheseismicfragilityofthecontainmentconsideringthesoil-structureinteractionwiththeaidofthefiniteelementanalysisplatformSAP2000andOpenSees.Thecompletedworkandmainachievementsofthisthesisareasfollows:(1)Onthebaseoffinemodelinnumericalsimulation,theexistingrestoringforcemodelofthecontainmenthasbeenimprovedandvalidated.Theseismicfragilityanalysishasconsideredthesoil-structureinteraction(SSI).Thesoillumpedparametersmodelhasaccountedthethequalityofthesoil,whichhasahigheranalysisprecision.(2)Seismicfragilityanalysisbasedonthemontecarlomethodandresponsesurfacemethodisperformed,respectively.Seismicfragilitycurveconsideringsoil-structureinteractionhasbeenobtained.Amathematicalmethodforprocedingtheresultfromthenonlineartimehistoryanalysisisintroduced,whichhasgreatlyreducedtheworkloadofmontecarlosimulation.Itisindicatedbytheanalysisoftheresultsoffragilitythatthefragilitydependsontheselecteddamageindex.Inthispaper,topdisplacementissuggestedtobethedamageindex,forwhichhasconsideredthepositiveaffectionoftheplasticityofstructure.(3)Theseismicfragilityanalysisresultbasedonthemontecarlomethodandresponsesurfacemethodcoincidewitheachotherthroughcomparison,whichverifiedthevalidityofthemodelatthesametime.Thefundamentalfrequencyofthecontainmentismuchhigh,correspondingtotheupsectionofresponsespectrum.Hencetheresponseofthecontainmentincreasewhenconsideringthesoil-structureinteractionbecauseofthedecreasedstructuralstiffness.SotheSSIeffectcannotbeignored.Keywords:reinforcedconcretecontainment,seismicfragility,soil-structureinteraction,restoringforcemodel,montecarlomethod,responsesurfacemethod哈尔滨工业大学工学硕士学位论文III目录摘要.................................................................................................................................IAbstract............................................................................................................................II第1章绪论....................................................................................................................11.1课题背景及研究的目的和意义..............................................................................11.2安全壳结构抗震分析研究现状..............................................................................21.2.1安全壳结构抗震分析综述...............................................................................21.2.2土结构相互作用分析综述...............................................................................41.3本文主要研究内容..................................................................................................6第2章安全壳土-结构相互作用的有限元模型.............................................................72.1安全壳结构概况......................................................................................................72.2安全壳三维实体建模..............................................................................................82.2.1SAP2000及分层壳单元简介............................................................................82.2.2模型的建立和分析...........................................................................................92.3集中质量模型及其在OpenSees中的实现...........................................................112.3.1集中质量模型..................................................................................................112.3.2OpenSees简介.................................................................................................122.3.3截面的恢复力模型.........................................................................................132.3.4单元的建立.....................................................................................................152.3.5地震作用动力时程计算和输出设置.....