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1、重慶大學(xué)碩士學(xué)位論文(6)對(duì)溫度裂縫的成因進(jìn)行了詳細(xì)分析,根據(jù)裂縫形成的原因提出了橋梁在設(shè)計(jì)階段和施工階段相應(yīng)的預(yù)防控制措施。關(guān)鍵詞:混凝土箱梁,日照,溫度場(chǎng),溫度應(yīng)力II英文摘要ABSTRACTDuetothepoorthermalconductivityofconcrete,thestructurewillformalargerthermalloadbysolarradiation.Thermalstressproducedbythethermalloadisoneoftheimportantfactorsthatresultinthecrackoftheconcretebox
2、girder.Becauseofthecomplexityofconcreteheattransferproblem,thetheoryandcalculationmethodabouttemperatureeffecthascertaindefectsduringthedesignofconcretebridge.Thesimplifiedcalculationmodelandmethodcanmakethevalueofthethermalloadandthermalstressesappearlargererror.Thispaperdoesanin-depthresearc
3、honthetemperaturefieldanditseffectofconcreteboxgirderbysolarradiation,withimprovingthecalculationtheoryandmethods,analyzinganddiscussingthevalueofthermalload.BasedontheXingFuyuanReservoirBridgeinGuilindoublebridge,thispaperselectsthesinglechamberboxgirdersectionofthebridge’scontinuousrigidfram
4、eperiodastheresearchobject,hasmadethefollowingresearch:(1)Thetemperaturefieldtestinstrumentsandmethodofthesingleroomboxgirdermeasurementareillustrated.Byanalyzingthemeasureddataoftemperaturefieldundercontinuoushotweather,thecharacteristicsoftemperaturefieldaboutroof,webplate,andbottomplateofth
5、eboxgirderareputforward.(2)Themechanismofheattransferisstudiedbetweentheconcreteboxgirderandtheexternalenvironment.Andthesunshinetemperaturefield’sboundaryconditionssystematicallyareexplained.Thesunshinenumericalcalculationmodeloftemperatureresponsewhichcansatisfythecomplexboundaryconditionsof
6、concreteboxgirderisestablished.(3)Thispapercollectsandanalysesthesunshinetemperaturedistributioncalculationanalysismethodofconcretesingleboxgirderwhichassumesthatthetemperaturedistributionalongtheconcretewallthicknessdirectionhasaone-dimensionalperiodiccharacteristic.Andthroughtothetraditional
7、onedimensionheatconductiondifferentialequationnumericalsolution,theanalyticalsolutionexpressionofwalltemperaturefieldinsidethatisintheformofFourierseriesisgot.Onlyittakesafewoftheanalyticsolutionintheapplicationthatcangetenoughaccurater