5风险管理的原理

西安建筑科技大学硕士论文单层钢结构工业厂房抗震性能分析专业：建筑与土木工程硕士生：石巍指导教师：苏明周教授摘要地震是一种瞬间发生，监测预警困难，破坏剧烈以及次生灾害严重的自然现象，因此对结构的抗震性能有着严格的要求。目前我国对钢筋混凝土结构的抗震研究较多，而对钢结构的抗震研究较少。本文在介绍了轻型钢结构发展的现状、特点和主要形式的基础上采用结构动力学理论和结构计算分析软件SAP2000，对单层轻型钢结构厂房进行了整体模态分析、地震反应谱分析和时程分析，由分析结果可以看出：（1）通过动力特性分析之后，就结构前6个振型可知，建立结构整体模型可以更好地分析结构的受力性能；通过振型图得出结构薄弱部位，可以加强结构设计。（2）介绍了抗震设防原则、地震作用计算的一般规定，采用振型分解反应谱法对厂房进行了地震反应谱分析；得出各向地震作用下的位移云图和各控制节点的位移。（3）分析了三个地震波作用下结构的时程分析，得到了结构的柱顶侧移和柱底反力；三条波所得结果与地震波的变化规律相一致；三条地震波作用下，结果满足抗震规范要求。关键词：轻钢结构；动力特性；反应谱法；结构设计；时程分析西安建筑科技大学硕士论文SeismicAnalysisofsingle-layersteelstructureindustrialplantSpecialty:ArchitecturalandCivilEngineeringName:ShiWeiInstructor:Prof.SuMingzhouABSTRACTAnearthquakeisinstantaneous,difficultiesinmonitoringandearlywarning,aswellassecondarydisastersseriouslyundermineviolentnaturalphenomena,sotheseismicperformanceofthestructurehasstrictrequirements.Atpresent,Chinaearthquakeofreinforcedconcretestructuresmoreresearch,butfewstudiesontheseismicsteel.Thispaperdescribesthestatusofthedevelopmentoflightsteelstructure,characteristicsandmainformbasedontheuseofstructuraldynamicstheoryandstructuralanalysissoftwareSAP2000,single-layerlightsteelplantfortheoverallmodalanalysis,seismicresponsespectrumanalysisandtimehistoryanalysis,theanalysisresultscanbeseen:(1)Throughdynamiccharacteristicanalysis,asregardsthestructurebeforethesixmodesshowsthattheoverallstructureofthemodelcanbecreatedtobetteranalyzethestructureofthemechanicalproperties;modaldiagramdrawnthroughstructurallyweakpartsofthestructurecanbedesigned.(2)Describestheseismicprinciples,thegeneralprovisionsofseismiccalculation,usingthemodalresponsespectrummethodforseismicresponseanalysisofplantcarriedout;drawisotropicdisplacementunderearthquakecloudandthedisplacementofthecontrolnode.(3)Analysisofthethreestructuresunderseismictimehistoryanalysis,thestructureandthebottomofthecolumncapitalslateralreactionforce;three-waveresultsobtainedwiththevariationofseismicwavesareconsistent;西安建筑科技大学硕士论文threeseismicwaves,theresultsmeettheseismiccoderequirements.Keywords:Lightsteelstructure;dynamiccharacteristics;responsespectrummethod;structuraldesign；timehistoryanalysis.西安建筑科技大学硕士论文I目录1绪论.....................................................................................................................11.1引言.........................................................................................................11.2门式刚架的结构组成.........................................................................21.3门式刚架的布置.................................................................................31.4抗震研究简介.......................................................................................41.4.1抗震研究的重要性................................................................41.4.2结构抗震理论的发展...........................................................61.5课题研究的目的和意义.....................................................................81.6本文的主要工作...................................................................................92工程案例简介.................................................................................................112.1案例介绍..............................................................................................112.2本工程设计与施工中相关参数的选取及做法..........................162.2.1设计方面...............................................................................162.2.2施工方面...............................................................................173厂房整体结构动力特性的分析..................................................................193.1引言.......................................................................................................193.2厂房整体结构分析模型的建立......................................................193.3厂房整体结构动力特性分析..........................................................203.3.1基本理论...............................................................................203.3.2动力特性分析结论..............................................................244厂房整体结构的地震响应谱分析..............................................................254.1反应谱理论........................................................................................254.1.1概述........................................................................................254.1.2反应谱的基本原理..............................................................254.2分析模型的建立...............................................................................274.3反应谱分析结果...............................................................................284.3.1位移响应结果分析..............................................................284.4本章小结.............................................................................................315多遇地震下结构时程分析...........................................................................335.1结构时程分析理论............................................................................33西安建筑科技大学硕士论文II5.1.1时程分析法概述..................................................................335.1.2地震反应分析模型..............................................................335.1.3地震波的选取........................