下拉索多塔斜拉橋結(jié)構(gòu)體系分析研究.pdf

1、重慶交通大學(xué)碩士學(xué)位論文下拉索多塔斜拉橋結(jié)構(gòu)體系分析研究姓名：劉小明申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：橋梁與隧道工程指導(dǎo)教師：王福敏20091101ABSTRACTFormultipyloncable—stayedbridge，whenanexternalloadactonthemidspanamongtheloadedholes，themainbeamwillproducedownwarddeflection，mecabletensionfor

2、cewillincrease，thebridgepylonswillproducebiasedtowardsthedirectionoftheloadedholedeformation，whichmakestheinteractionoftheadjacentspanscreatedupwarddeflectionAtthesametime，anotherbridgepylongeneratetheinversedisplacement

3、oftheloadedbridgepylonOwingtolackinganchorcabletocontrolthelongitudinaldisplacementofthemidpylon，thewholemulti。pyloncablestayedbridge，Sdisplacementlimitedonlybythemainbeamandtherigidityofthebridgepylon，whichmakesthestruc

4、turemoreflexiblethansinglepylonordoublepylonscablestayedbridgeThetopsofallpylonsexceptthesidepylonswillproducemuchlongitudinaldisplacement，therigidityofthemainbeamwilldecreasestronglyundertheactionofthemovingloadTheseare

5、thebeatingcapabilityofthemultipyloncablestayedbridgeHasbeenthatpeoplearelookingatwaystoimprovetherigidityofthemid—pylonInthispaper，structuralmechanicsandnumericalfiniteelementmethodstocarryoutacomprehensivestudy，alargenu

6、mberofresearchandcomparativeresearchprojectonthebasisofsummingupthedevelopmentprocessofmultipyloncable—stayedbridgeandresearch；proposeanewsystemofmultipyloncablestayedbridgethatdraglinesareunderthebridgedeck；studyonhowto

7、enhancethestructurerigidityandreducethedisplacementwhichisthekeytechnicalproblemsinthedesignofmulti—pyloncablestayedbridge；comparevariousconventionalmeasuresaboutimprovetherigidityoft11epylonindetail；suggestthatthemethod

8、simplificationdesignsreckoningimprovingtherigidityofthemidpylonSummarizeanoverviewoftheconceptualdesignoftllemultipyloncable—stayedbridgewhosedraglinesareunderthebridgedeck，includingstructurelayout，constructiondesignofan

9、economicanalysis；discussthefatigueproblemthatdraglinepartbendingarousesdown；deepenthelawofrigiditysimilar；designtheOrganicGlassmodeltestonthreepyloncablestayedbridgetoverifytheaccuracyofpretheoretical；Studieshaveshowntha

10、tmulti—pyloncablestayedbridgeunderthecablestructuresystemCaneffectivelyimprovethestructuralrigidityandrelativelyeconomicalandreasonable，itCanbeappliedtopromotethenewarchitectureKEYWORDS“multipyloncablestayedbridge；downha