预应力钢混凝土组合梁非线性分析及优化设计

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1、西南交通大学硕士学位论文预应力钢-混凝土组合梁非线性分析及优化设计姓名：张卫红申请学位级别：硕士专业：桥梁工程指导教师：许惟国20081201西南交通大学硕士研究生学位论文第1I页Absl：ractBasedonANSYSprograms，thenonlinearfiniteelementmodelsoftwo—spanprestressedsteel．concretecontinuouscompositebeamwereestablished．ThemainWOrkandsomeimportantconclusion

2、sincludedasfollows：1．Usingnonlinearfiniteelementmethod，thisP印ercalculatesandanalyzesthewholebearingprocessofprestressedcompositebeam，theelasticultimatedeflectionandbearingcapacitiesareevaluatedandtheload—deflectioncurveisalsoobtained，moreovercomparescalculatingr

3、esultswithexperimentalresults．Fromtheanalysisresults，wecankownthattheresultsofusingcalculatingmodelandmethodcoincidewiththeexperimentalresults，whichprovesthatthefiniteelementanalysiscanbeusedinsteadofsometestresearch．2．Analysiswereconductedtoinvestigatetheflexur

4、alcapacityandslippropertyunderdifferentparameter，suchasconcretestrength、steelstrength、degreeofshearconnection、prestressingoftheexternaltendons，etc．Itshowsthat：(a)Thelowerconcretestrengthaswellasdegreeofshearconnectionwillresultinthereductionoftheflexuralcapacity

5、；(b)Concretestrengthhasgreaterinfluenceonmechanicalperformanceofthebeamthantheprestressingoftheexternaltendonsandsteelstrength，thehigherprestressingoftheexternaltendonswillresultinthereductionofthedeflectionofprestressedcompositebeamthroughthewholebearingprocess

6、，thelowersteelstrengthaswellaslowerdegreeofshearconnectionwillresultinthereductionofthedeflectionincrement．3．Thesynthesiscomparisonofwebheight，bottomflangeplatethickness，webthickness，topflangeplatethicknessandconcreteslabthicknessandthesectionoptimizationdesignw

7、erecarriedon．Thecomparisonresultindicatesthatsteelwebheight，concreteslabthicknessandbottomflangeplatethicknessarestrongfactors，webthicknessandtopflangeplatethicknessareweakfactors．TheoptimizationresultindicatesthatthemethodiSefficienttooptimizethesectionofcompos

8、itebeams，s0itcouldbeappliedextensivelyintheengineeringofcompositebeamssectionoptimizationdesign．西南交通大学硕士研究生学位论文第m页Keywords：PrestressedCompositeBeam；BearingCapacity；No