文献综述--桥梁热效应

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1、LiteratureReviewaboutSolarRadiation-inducedThermalEffectonConcreteBridgeAbstract:Changingenvironmentalcondilions,especiallytemperature,havebeenobservedtobeacomplicatedfactoraffectingvibrationproperties,suchasfrequencies,modeshapes,anddampingofcivilstructures.Thispaperreviewstechnicalliteratureconc

2、erningsolarradiation-inducedtemperatureeffectonconcretebridge・Mostofthesestudiesfocusonvariationsinfrequenciesofbridgestructures,withsomestudiesonvariationsinmodeshapesanddampingandothertypesofstructures・Ilisseenlhailhenumericalmodelscansuccessfullypredictthestructuraltemperaturefieldandthermalstr

3、essesatdifferentlime.Themethodologyemployedinthepapercanbeappliedtootherconcretebridgesaswell.Keyword:temperature;liierature;bridgestructures;methodology1IntroductionManyconcretebridgesaresubjectedtodaily,seasonalandyearlyenvironmentalthermaleffectsinducedbysolarradiationandambientairtemperature・E

4、xperimentsandfieldmeasurementshaveindicatedthatchangingthermalconditionsmayhaveamoresignificanteffectonconcretebridgebehaviorthanoperationalloads・Theheattransferfromsurroundingenvironmentmayinducetemperaturevariationatconcretecomponentsandtherebyproducestructuraldeformationandthermalstressesduetor

5、edundancy.Thethermaleffectsonconcretebridgesevenlongspanbridgeshavebeeninvestigatedbymanyresearchersacrosstheworldsince50yearsagoandsomeapproacheshavebeendevelopedtoexaminetheperformanceofbridgessubjectedtotemperatureloading・Withtherapiddevelopmentofcomputationalmethodsandcomputertechnology,anumbe

6、rofone-dimensionaltothree-dimensionalfiniteelementmodelshavebeendevelopedsincethe1970s.Mostofthecurrentinvestigationsmainlyfocusonthermaleffectsonconcretebridges・Theconfigurationandperformanceoflongspanbridgessuchassuspensionbridgesarequitedifferentfromthoseofcommonconcretebridges・Itisdifficultand

7、insufficienttoinvestigatethebridgeperformancethoroughlybyusingthetemperaturedataatafewcomponentsonly.Therefore,calculationofthetemperaturedistributionofthebridgecomponentsisimperativetostudythetemperatureeffects・