拱塔斜拉桥设计参数与几何非线性分析

拱塔斜拉桥设计参数与几何非线性分析

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时间:2019-02-19

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1、L-.硕士学位论文ABSTRACTBasedonthepreliminarydesignofasingletowercable-stayedbridgeWithanarch—towercalledBenRiverBridgeinacity,themainstaticanalysisresults,dynamicanalysisandstabilitycalculationofthearch-towercable—stayedbridgeispresented.Thisthesisconcentrat

2、esonthedesignparametersandthegeometricnonlinearityofthearch-towercable—stayedbridge.Systematicalresearchiscarriedoutbyusingtheparameteranalysisandthefiniteelementmethodtoinvestigatetheinfluenceofthemainstructuraldesignparameters,suchastheratiobetweenth

3、eheightoftowerandthelengthofmainspan,thelengthofunsupporteddeckadjacenttotheendofmainspan,thelengthofunsupporteddeckadjacenttopylonandthestiffnessratiobetweengirderandpylon,onstructuraldisplacement,internalforceandtensionofcables,whenthebridgeisunderli

4、veload.Finally,theeffectsofgeometricnonlinearityonstructuralstaticbehaviorofarch·-towercable.-stayedbridgeunderthefirststageofdeadload,thesecondstageofdeadloadandliveloadrespectivelyareexamined.M1resultscanbereferencestothedesignofthesametypebridge.Int

5、histhesisthemainconclusionsareshowedinthefollowing:1.Parameteranalysisshowsthatwiththeincreaseoftheratiobetweentheheightoftowerandthelengthofmainspan,themomentsanddisplacementsofthekeysectionsofthemaingirderandpylonandthemaximumtensionofcablesexperienc

6、eagradualdecreasingtrend,howevertheabsolutevalueofnegativereactionofside—spansupportincreasetremendously.Also,withtheraiseofthelengthofunsupporteddeckadjacenttotheendofmainspan,themomentsofthemaingirderandpylondecreaseprogressively,butthemaximumdeflect

7、ionofthegirder,horizontaldisplacementatthetopoftowerandnegativereaction’Sabsolutevalueofside—spansupportincreaseprogressively.Especially,thetensionofcablesneartotheendofthegirderincreasesrapidly.Ⅱ硕士学位论文ABSTRACT2.WithtIleclimbofmelengthofunsupporteddeck

8、adjacenttopylon,thehoggingmomentofthegirderneartopylondropsmonotonously.Bycontrast,thelongitudinalmomentofthebottomofpylonhasaslowdescendingtrend.讹at’smore,withtheascentofthestiffnessratiobetweengirderandtower,themomentsofthemaingirder,

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