大跨徑預(yù)應(yīng)力混凝土橋梁溫度、徐變效應(yīng)的分析研究.pdf

1、浙江大學(xué)碩士學(xué)位論文大跨徑預(yù)應(yīng)力混凝土橋梁溫度、徐變效應(yīng)的分析研究姓名：王林申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：橋梁與隧道工程指導(dǎo)教師：項(xiàng)貽強(qiáng)20050101浙江大學(xué)碩士學(xué)位論文〔2005)AbstractWhenlargespanprestressedconcretebridgesareso灼ectedtotemperatureloadorconcretecreepactionverylargeinternalforcewillarosewith

2、inthestructureandwhichwillweakentheresistcrackingperformanceofitssectionsandtemperaturecrackscanbeproduced.Thusthesafetyanddurabilityofthebridgesmaybeseriouslyafected.Theworkbasedontheformerresearchestakinga帥icalthreespa

3、nprestressedconcreterigidframebridgeandaprestressedconcretecablestayedbridgeasthebackgroundtheinfluenceoftemperatureloadandconcretecreeponthebridgestructureisanalyzedBasedonheattransferandFEMtheorytheinfluenceoftemperatu

4、reloadandconcretehydrationheataswellasitsdistributiononthistypeofbridgesisresearchedandanalyzedbyadoptingdiferentmodelsoftemperatureloadinthecodesofvariouscountries.Theresultsshowthatforprestressedconcretecontinuousbridg

5、estheresultsobtainedbythecalculatingmodalinChinesenationalcode“GeneralCodefordesignofHighwayBridgesandCulverts“(JTGD602004)ismorereasonablefairlylargetensilestresseswillaroseatthebotomofthegirderbecauseoftemperatureincre

6、asinganditisevenlargerthantheefectsofliveloadssometimesMoreoverthereisfairlylargelateraltensilestressatthebotomofthetopflangeofboxgirderandsomeothermembersbecauseofthenonlinearityofthetemperaturevaringalongtheheightandth

7、espatialvariationsimilarlythereisfairlylargetemperaturestressatthecantileverflanges.Theinfluenceofconcretecreeponbridgestructureundertheconstructionandoperationstageforprestressedconcretecontinuousrigidframebridgeandcabl

8、estayedbridgeisalsoanalyzed.EspeciallyintheanalysisofcablestayedbridgebycomparingtheoreticalvalueswithtestingdatathecomputingformulainthecodeCEBFIPisconsideredtobemoreascendantinreflectingtheinfluenceofconcretecreeponbri