混凝土箱梁温度场试验与温度效应理论分析

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1、重庆大学硕士学位论文（6）对温度裂缝的成因进行了详细分析，根据裂缝形成的原因提出了桥梁在设计阶段和施工阶段相应的预防控制措施。关键词：混凝土箱梁，日照，温度场，温度应力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