基于体系可靠度的半刚性钢框架结构优化设计研究

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1、汕头大学博士学位论文基于体系可靠度的半刚性钢框架结构优化设计研究姓名：何嘉年申请学位级别：博士专业：结构工程指导教师：王湛2010-05 摘要扑形式、连接形式和可靠度水平，使结构优化设计具有更好的工程实际意义和参考价值。然后，通过实际工程例子详细阐述了分项系数准则设计方法的理论基础和实现方法。最后，总结了全文并对下一步研究工作进行了展望。关键词：钢框架支撑体系结构体系可靠度半刚性优化设计遗传算法离散型拓扑优化II AbstractAbstractStructuraloptimizationist

2、heeternalgoalinengineering;itisnotasimplemathematicalproblembutanengineeringproblemwithpracticalsenses.Itisakeyresearchonstructuraloptimizationhowtomakethosedesignsbotheconomicalandsafe.Becauseofaseriesofparticularitysuchasthelargenumberofvariables,d

3、iscreteandhighlightednonlinearity,thereisaseriousgapbetweentheoreticalmethodsandtheirapplicationsinpracticaldesign.Thisthesispresentedresearchesonoptimaldesignofsteelframesinthreeareas,structuralsystemreliability,semi-rigidconnectionandbracing.Firstl

4、y,structuralsystemreliabilitywasconsideredinoptimaldesign,becauseitcouldreflectstructuralsafeperfectly,whichcouldbebettertoreflectthetruemeaningofstructuraloptimization.Existingmethodsonstructuralsystemreliabilitywerediscussed,andsomenewmethods--adva

5、ncedMonteCarlomethodandadvancedPNETwereproposed,whichweresuitableforcomplexstructureanalyzingusingfiniteelementmethodbasedoncharacteristicsofreliabilitymethods.NumericalexamplesshowedthatadvancedMonteCarlomethodwashighaccurate,easttoimplementandeffic

6、ient;itcouldbereflectedrelationshipbetweendifferentfailuremodesobviouslyusingadvancedPNET.ThatmethodwasmoreefficientthenMonteCarlomethod,andwassuitableforevaluatingtoastructureatpreliminarydesign.Secondly,inordertoreflectcharacteristicsoftheframeandg

7、etapraticaloptimaldesign,semi-rigidconnectionandsystemreliabilitywereconsideredinoptimization.Themathematicalmodelofreliabilitybasedonfiniteelementmethodforsemi-rigidframeandreliabilitysystemtheorywerepresented.Anexampleofframeoptimaldesignforsemi-ri

8、gidframeusinggeneticalgorithm(GA)wasshowedthroughaframestructure.Itwasshownthatwithoutreliabilityconstraint,theoptimaldesignobtainedhadaverylowreliability,evenwouldnotreachtherequiredlevelofstructuralsafetyofChinesecriterions.Itmayleadtopotentialsafe