拱塔斜拉桥设计参数与几何非线性分析

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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，