双层柱面网壳形状优化设计与稳定性-分析

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1、■I-．●山东建筑大学硕士学位论文ShapeOptimizationandStabilityAnalysisofDouble-layercylindricalshellZhangDeheng(MechanicsofEngineering)DirectedbyLuXiaoyangABSTRACTShallstructureisaspatialstructureofsystemsformedwhichthebarregularlyarrangealongthesurfaceandconnectedbyt

2、henodes，Ithaveinherentpropertiesoftrussstructureandthinshell．Structureoftheshellhaveaseriesofadvantages，suchascoveralargespall’reasonablespaceforce，differentformsofsurfaceofshdlstructurecanprovidebeautifulshapeandfullofartisticexpression，whichisthemost

3、widelyusedtypeofspatialstructureoflarge，cross-architecturenow．Structuraloptimizationisseekthebestsolution蛋K腿曩nmnb贯ofpossiblesolutionsundertheconditionsoftheprogram．Itisbased011avarietyofpracticalproblemsofengineeringstructurestoestablishthecorrespondin

4、gmathematicalmodel，usingoptimizationtechniques，tofindtheoptimalsolutionunderavarietyofconstraints．Comparedwiththetraditionaldesign,becauseofitsadvantagesofreasonabledesign,materialsaving，nowhavea、聃derangeattentionathomeandabroadinengineeringfield．Inthi

5、spaper,theshapeoptimizationhasbeendoneofdoublc-lay贫cylindricalshell，Andhasanalyedthestabilityofoptimizedpyramidcylindricalshdl．First,wellscfiniteelementanalysiss01．areALGORtoanalysisStaticcharacteristicsofthedouble-layercylindricalshell，WithlossofcrOSS

6、-OVerandthickness—spanratiochanges，forcecharacteristicsanddisplacementcharacteristicsofdomecanbeobtained．Itcanprovidethebasisforselectionofdomestructureforthefollowinginitialmacroscopicsurfaceshapeoptimizationparameters．ThenfortheDouble—layercylindrica

7、lshellfeatures，weproposedtwo·stagealgorithmofshapeoptimizationofDouble-layercylindricalshellstructure．Thefirstleveloptimizationinafixedgeometricshape,usingthediscretevariableoptimizationofone—dimensionalsearchalgorithmandtherelativedifferencequotientfo

8、rcrOSS—section；Inthesecondleveloptimization,becausetheDouble—layercylindricalshellhavemanyofthenodes，weconversⅡbuckling．Determinedbucklingloadoptimizationandbucklingmodesofshellbeforeandafteroptimized．verifythesecurityandreliabilityofth