斜拉橋主梁結(jié)構(gòu)的模糊可靠性理論與應用研究.pdf

1、西南科技大學碩士學位論文斜拉橋主梁結(jié)構(gòu)的模糊可靠性理論與應用研究姓名：郭熾斌申請學位級別：碩士專業(yè)：結(jié)構(gòu)工程指導教師：尹益輝20090610西南科技大學碩士研究生學位論文第1I頁AbstractWithchangesofthedesignmethodsofreinforcedconcretestructuresfromdeterminedworthmethodtoprobabilityone(conventionreliabilityd

2、esignmethod)，thecomponents’designsaremademorescientificandreasonable，andthedesignlevelreachesanewdegreeHowever，theconventionalreliabilityanalysismethodaresubjectedtosomelimitationsinpracticaluses，becauseittakesonlyrandom

3、nessofdesignuncertaintyfactorsintoaccountandignorestheexistenceofanobjectivefuzzinessThefuzzyreliabilitydesigntheoryissuchakindofdesignonethattakesboththerandomandfuzzyphenomenaintoconsiderationatthesametimeFirstofall，th

4、isthesisintroducestheanalysismethodsofconventionalandfuzzyreliabilitydesigntheories，andthenusesfiniteelementsoftwareANSYStocarryoutastaticsolutionandanalysesthecharacteristicsofthevibrationmodeandtheseismictimehistoryofa

5、doubleropesurfacecable—stayedbridgeThroughtheanalyses，themaxmomentofthebridgemainbeam—sectionsunderthedesignandseismicloadsisfoundoutwhichisatthepointsof7515lmand8315lmfromtheEastofthemaintowerrespectivelyThefuzzyfactors

6、(Forexamples，thebendingmomenteffectiscausedbyload，andloadshouldbecontinuousinnature，randomandfuzzyeachlevelshouldbebetweentherangeofagradualtransition，ratherthantheexistenceofclearboundaries；theuncertaintyofmainbeamoffle

7、xuralcapacitycomesfromthematerialproperties，componentgeometryparametersandcalculationmodelsandSOon，thesefactorshaveacertaindegreeoffuzziness)thataffectsthemaximummomentandthebendingcapacityofthemainbeamisanalyzedByusingo

8、ftheconventionalandfuzzyreliabilityanalysismethods，thebendingstrengthofthecrosssectioniSdiscussedTheresultshowsthattheconventionalreliabilityreaches09999999925andthefuzzyreliabilityfromdifferentmethodsarefromO9995640000t

9、o09999999400，indicatingthatthismainbeamhasgoodbendingstrengthButtheconventionandthefuzzyreliabilityofthemainbeam’Saseismicstrengthare523，33l(earthquakeresistancesecurityisgood)and3O1，152(earthquakeresistancesecurityunsat