超高层建筑加强层优化及伸臂桁架根部节点抗震性能研究

分类号：TU398密级：公开档案号：2013-06-081402-49-012学号1011031012硕士学位论文（2013届）超高层建筑加强层优化及伸臂桁架根部节点抗震性能研究研究生姓名黄鲲指导教师姓名戴雅萍教授级高工专业名称结构工程研究方向混凝土结构与组合结构理论及其应用论文提交日期2013年6月苏州科技学院硕士学位论文超高层建筑加强层优化及伸臂桁架根部节点抗震性能研究硕士研究生：黄鲲指导教师：戴雅萍教授级高工学科专业：结构工程苏州科技学院土木工程学院二零一三年六月MasterDissertationofSuzhouUniversityofScienceandTechnologyTheoptimizationofstrengthenedstoriesforsuperhigh-risestructuresandInvestigationonAseismaticPerformanceoftheconnectionjointbetweenoutriggerandinnercoreMasterCandidate:HuangKunSupervisor:Professor-SuperiorEngineerDaiYapingMajor:StructureEngineeringSuzhouUniversityofScienceandTechnologySchoolofCivilEngineeringJune,2013苏州科技学院硕士学位论文摘要I摘要随着经济的发展、科技的进步、城市人口的集中、用地紧张，建筑的层数、高度不断得到提高。随着结构高度的增加，水平荷载作用下（风荷载和地震作用）结构的侧向位移也迅速增大，逐渐成为影响结构安全的控制性因素。若采用增大抗侧力结构例如核心筒厚度等来控制其变形，这样做不但不经济，而且由于竖向截面过大而影响使用。设置水平加强层，可充分发挥内筒和外柱各自的优势，使得外框柱产生拉压力来抵消一部分倾覆力矩。设置加强层是减少结构侧移的一种经济而有效方法。因而，带加强层的框架-混凝土核心筒结构在高层建筑结构中不断得到应用。伸臂桁架在超高层结构中能够起到提高框架的抗侧贡献、减少结构侧移、增加结构的侧向刚度、平衡不均匀沉降差等作用，因此伸臂桁架根部连接节点性能优劣直接影响整体结构的抗震性能。然而，国内对此类节点的抗震性能研究也较少，我国规范对此类节点并没有规定具体的设计方法。本文结合苏州某68层、高268.5m的超高层框架-核心筒结构对其进行加强层的优化研究。若不采取有效措施，结构的顶点位移及层间位移角等很难满足规范要求。通过不同方案如改变加强层的位置、数量、加强层层高以及框架与核心筒的连接方式等对其自振周期、位移、内力等影响的比较，得出结构的优化方案，并运用Midas软件对优化后的结构进行大震下的动力弹塑性时程分析,为结构的设计提供一点建议。最后，利用有限元软件ABAQUS以50层伸臂桁架根部节点为原型，建立1/7的缩尺模型，对该节点进行抗震性能分析并对改变参数如桁架的翼缘高度、厚度等进行分析。得出结论：设置一道加强层时，加强层设置在0.5~0.6H时，减少结构位移的效果最好，随着加强层数量的增多，结构侧移越小，结构的内力突变程度得到缓解，但减少效果变弱。弹塑性时程分析表明优化后的结构满足既定抗震性能目标。宜使伸臂桁架梁端屈服具有较好的耗能能力。关键词:加强层，优化分析，伸臂桁架，节点，有限元`苏州科技学院硕士学位论文AbstractIIAbstractWiththedevelopmentofeconomicandtheprogressofscienceandtechnology、Citypopulationconcentrationandlandshortage.Theheightandthelayersoftall-buildingshavebeenimproved.Withtheheightincreases,thelateraldisplacementofstructureunderhorizontalload(windloadandearthquakeload)isalsoincreasingrapidly,andgraduallybecomesacontrollingfactorthataffectthesafetyofthestructure.ItdoesnotonlyeconomicifincreasethestiffnessofrisistancememberssuchasthickNessthecore-tubetodecreasethestructuresidesway,butalsotheverticalsectionistoolargeandaffecttheusage.Itisnotsatisfiedthereqirementcodedemandintopdisplacementandstoreydriftsifnoeffectivemeasures.Itisaneffectivemeanstodecreaseofstructuralhorizontaldisplacementbysettingstrengthenedstorywhichcanmaketheadvantageoftheinnercoreandtheouterframerespectively.Thetensionandpressureinframecolumncanoffsetaportionoftheoverturningmomentofthestructure.Sosetoutriggersisaeconomicandeffectiveapproachtoreducethelateraldisplacement.Thus,frame-coretubestructureswithoutriggersarewidelyusedinsuper-tallbuildings.Outriggertrussisabletoenhanceframe’scontribution,increasethelateralstiffnessofthestructure,reducethelateralshiftandbalancethesettlementandcreepdifferenceinhigh-risebuildings,sotheperformanceoftheconnectionjointbetweenoutriggerandinnercoreisveryimportantthatcandirectlyinfluencestheseismicperformanceoftheoverallstructure.Butthereisnoregulationsandspecificdesignmethodsforthiskindofjoint.A68-story268.5mhighetskyscraperframe-corestcucturewihstrengthenedstoriesistakenasaexamplewhosemodelisconstructedforanalysisinthispaper.Ifnoeffectivemeasures,thestorydriftandthehorizontaltopdeflectionofthestructureisdifficulttomeettherequirementsofnationalcodes.Thearrangementsofthestructurearecomparedamongseveraldifferentschemes,suchasthelocation、thequantityandtheheightofstrengthenedstories、frameandcoretubeconnectionsandsoon.Thearrangementoptimizationofstrengthenedstoryarediscussedontheparametersthataffectofnaturalperiodofvibration、thehorizontaltopdeflection、thestorydriftandinternalforce.Theelasto-plastictime-historyanalysisunderfrequentrareearthquakesoftheoptimizedstructureiscarriedoutbytheaidofMidasprogram.Somevaluablesuggestionsareprovidedtothedesignworks.Finally,basedonthe50layeroutriggersjointasaprototype,1/7scalemodeloftheoutriggersjointareestablished,TheparameterssuchasthethickNessandheighofthe`苏州科技学院硕士学位论文AbstractIIIflangeareanalysised.Conclusions:Thesidewayofthebuildingcanbencontrolledverywellwhenthelocationofonlyoneoutriggerissettedin0.5~0.6H,withthenumberofoutriggerincreased,mutationofinternalforceinthestructurecanberelieved,butreducetheeffectbecomeweak.Tomaketoutriggertrussbeamyieldedgoodenergydissipationcapacity.Theelasto-plastictime-historyanalysisindicatethatthestructurecanmeetthepredeterminedperformanceobjectives.Itshowsthatoutriggertrussyieldfirstlyhasabetterenergydissipationcapacity.Keywords:strengthenedstory、optimizationanalysis、outriggertruss、joints,、finiteelement`苏州科技学院硕士学位论文目录IV目录摘要................................................................IAbstract...........................................................II第一章绪论.........................................................11.1概述.............................................................11.2带加强层结构的提出及应用现状.....................................21.3带加强层的结构国内外研究现状.....................................31.3.1加强层的位置优化研究.......................................31.3.2加强层的刚度优化研究.......................................51.3.3带加强层的受力性能的研究...................................61.4伸臂节点研究.....................................................81.5本