针对设备隔震的钢结构窑尾的地震反应研究

题目针对设备隔震的钢结构窑尾的地震反应研究TitleStudyonseismicresponseofsteelstructureofkilnequipmentisolation摘要钢结构窑尾具有能抗震、施工便捷、重量轻等优点，在国内外得到广泛的运用。但是在实际应用过程中，却因为工艺的特殊要求，平面尺寸小，开洞不规则，层高大且变化多，从而导致结构的刚度分布不规则，在设计过程中会发现构件的内力、层间位移和位移角大，这势必会使构件截面变大，从而增加了建设成本。本文主要是研究通过在设备下设置隔震支座，达到耗散地震能量，增大结构阻尼并减小结构地震效应的目的，为钢结构窑尾的设计开拓了一个新的思路。本文的主要研究内容如下：对隔震支座的研究，根据研究需要和规范规定隔震单元采用两节点间连接形式，隔震支座采用单独的隔震单元，作为结构与设备连接单元。隔震单元拥有线性和非线性属性，其中线形属性包括线性分析时使用的有效刚度和有效阻尼，非线性属性包括非线性分析工况使用的刚度，屈服力和屈服后的刚度比。以某地拟建的窑尾结构为工程背景，采用SAP2000建立不设隔震支座的普通窑尾钢结构的有限元模型，对其进行了模态分析，7度、8度反应谱分析，7度、8度多遇地震时程分析，7度、8度罕遇地震时程分析，并提取了各工况下的基底剪力、层间位移、层间位移角，发现都较大，有些甚至接近规范要求的限值。采用SAP2000建立设置隔震支座的窑尾结构模型，对其进行了模态分析、7度、8度反应谱分析，7度、8度多遇地震时程分析，7度、8度罕遇地震时程分析，提取各工况下的基底剪力、层间位移、层间位移角，并和普通窑尾结构的计算结果进行对比，发现各参数都有明显的减小，进而证明了在设备下设置隔震支座后可以有效地改善结构的抗震性能。关键词：窑尾,隔震支座,抗震性能,反应谱分析,时程分析IIAbstractSteel-structurepreheathasaseriesofadvantages,suchaslightweight,wellearthquakeresistance,easyconstruction,sothatitisdevelopedandapplieduniversallyallovertheworld.Butintheprocessofconstruction,specialprocessrequiresmallhorizontalspansize,irregularopenhole,higherpaceheightanddifferentchanges,whichleadtonon-uniformdistributionofstiffnessofstructure.Intheprocessofdesign,wefindthatstructuralmemberforce,storydrift,layerdisplacementanglearebigger,whichleadtobiggercomponentsection,highercost.Inthispaper,isolationbearingissetundertheequipmentresultingindissipateofearthquakeenergy,increaseofstructuraldampinganddecreaseofseismicresponse.Anewideaofdesignofsteel-structurepreheatisobtainedfromtheresearch.Themainresearchcontentsandresultsareasfollows:1、Researchofisolationbearing.Accordingtotherequirementsandtherulesofcode,theelementofseismicisolationadoptconnectingformatbetweentwonodesandisolationbearingusesingleelement,whichconnectthestructureandequipment.Theelementofseismicisolationhaslinerandnon-linerproperty.Linerpropertyincludeseffectivestiffnessandeffectivedampingintheanalysisofliner.Non-linerpropertyincludesstiffness,yieldstrength,stiffnessrationwithyieldundertheconditionofnon-lineranalysis.2、Underthebackgroundofproposedpreheat,finiteelementmodelwithoutisolationisestablishedbySAP2000.Baseshear,storydrift,layerdisplacementangleareobtainedfromtheanalysisofmodal,responsespectrumundertheseismicintensityof7、8degree,andtime-historyundertheseismicintensityof7、8degree.Andtheseparametersarelarge,evensomeofthesedrawnearthelimitofcode.3、FiniteelementmodelwithisolationisestablishedbySAP2000.Baseshear,storydrift,layerdisplacementangleareobtainedfromtheanalysisofmodal,responsespectrumundertheseismicintensityof7、8degree,andtime-historyundertheseismicintensityof7、8degree.Comparetothetraditionalpreheat,theseparametersaresmaller.Anditprovesthatsettingtheisolationbearingcanimprovetheseismicresistanceofstructure.Keywords：Preheat,Isolationbearing,Earthquakeresistance,Responsespectrumanalysis,Time-historyanalysisI目录Abstract.........................................................................................................................II目录...............................................................................................................................I第1章绪论................................................................................................................11.1窑尾结构简介..................................................................................................11.2工程概况..........................................................................................................21.3存在的问题......................................................................................................51.4本文研究内容和目的......................................................................................6第2章建筑结构隔震研究发展情况与理论分析....................................................82.1建筑结构隔震的进展......................................................................................82.1.1建筑结构隔震背景.......................................................................................82.1.2建筑结构的隔震发展.................................................................................102.1.3建筑结构地震控制方法.............................................................................122.2隔震结构的理论分析....................................................................................132.2.1隔震支座恢复力模型.................................................................................132.2.2常见隔震结构的数值模型.........................................................................172.2.3隔震体系结构分类.....................................................................................202.3隔震支座的选择和设计................................................................................22第3章地震作用下普通窑尾结构的有限元分析....................................................243.1SAP2000软件介绍.......................................................................................243.2建立窑尾结构有限元模型............................................................................243.2.1结构几何尺寸.............................................................................................243.2.2结构荷载的处理.........................................................