三座特大跨度铁路钢桥的温度效应分析

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1、conditionsleRhadlittleinfluenceonDTRB．3．Thethree．dimensionalfiniteelementmodelofBTRBhadbeenbuilt；Calculationandanalysisofthermaleffectshadbeencompletedaswell．Theresultsshowed：Theoverallwarming(orcooling)notonlygeneratedmainbeam’Sgreatstretch(orshrink)，butalsothe

2、topoftowercolumns’greatdisplacementalongthebridgeandbiggishstressonthebodyofpylons；However,themainpylons’sunshinetemperaturedifference(IO*C)alongthebridgegeneratedevengreaterdisplacementonthetopofpylons，whichwascomparabletothatgeneratedbythemostunfavorablelivelo

3、ad．TheothertemperaturelefthadlittleinfluenceonBTRB．Thebeamdeflection．rotationintheendandstressinthebeamwerenotobviousundera11thetemperatureconditions．4。Thethree．dimensionalfiniteelementmodelofDRABhadbeenbuilt；Calculationandanalysisofthermaleffectshadbeencomplete

4、daswell．Theresultsshowed：Inadditiontothemaingirder’Sbiggishstretch(orshrink)causedbytheoverallwarming(orcooling)，thetemperaturedifference(15℃)betweenthelowerandupperarchribwouldgeneratedthemaingirder’Sgreatdeflectionandrotationintheend，whichwerehalfaboutthoseoft

5、hemostunfavorableliveload，thestessintheupperandlowerarchribwerecomparabletothoseofthemostunfavorableliveload．Thetemperaturedifference(，l5℃)betweenthepartaboveandbelowthebridgedecksystemalsohadacertainimpactonDRAB，whiletheothertemperaturelefthadlittleinfluenceont

6、hebeamdisplacementandstressinDRAB．5．Themaingirder‘Sstretch(orshrink)generatedbytheoverallwarming(orcooling)ofthethreebridgesindifferentstuctrureformswasalmostequivalenttothatofthemaingirderinfreestate；Asaresult，thebeamexpansionjointsintheendandshiftingbearingstr

7、okecouldbeestimatedbyA／=aATI．Theresearchresultsofthisthesisprovidereferenceforthedesignofsupergreatrailwaybridgeswithlargespans．Keywords：thermaleffect；longsteelbridgeswithlargespans，cable—stayedbridge，steel—trussarchbridge，compositebeam，plate—trusscompositestruc

8、tureVClassification：U448．13VI目录原创性声明⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯I摘要⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．II目录⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯VIl绪论⋯⋯⋯⋯⋯⋯⋯⋯