rafael manzanarez：旧金山奥克兰海湾桥钢结构介绍

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1、TheNewSanFrancisco-OaklandBayBridgeSelf-AnchoredSuspensionSpanMarwanNader,PhD,P.E.–T.Y.LinInternationalRafaelManzanarez,P.E.,P.Eng–T.Y.LinInternationalCHONGQING,CHINAJune,20101AerialViewofBayBridgePaulChinn,TheSanFranciscoChronicle2SanFrancisco-OaklandBayBridgeEastSpanProjectLim

2、itsProjectLimits3SFOBBSpanHistory•OpenedNovember12,1936for$77m•3years,4,months,&3daystoconstruct•Longestvehicularbridgeintheworldwiththelargesttunnelintheworld4ProjectSite&SeismicityHaywardFault(7.5M)SanAndreasFault(8.1M)5DamagetoBayBridgeEastSpanDuringthe1989LomaPrietaEarthquak

3、e(7.1M)6NewEastBayBridgeSpan7SkywaySuperstructureFirstPrecastSegmentalBridgeinCalifornia8SkywayBatteredPiles9HingeADetailsFuse10HingeADetails11SelfAnchoredSuspensionBridge12SelfAnchoredSuspensionBridge13TowerLayout–LookingEast14TowerShaftDetails15TowerShearLink16T1TowerFoundatio

4、nvPileCap–6.5mdeepx22.5mwidex26mlongvSteelMomentResistingFrame(SMRF)EncasedinConcretevConnecttopilesbysheartabsv13–60mlong2.5mdiametervUpper30m–SteelShellPilesfilledwithConcretevLower30m–“rocksocket”embedintobedrockv424–7.5mlonganchorrods(388-75mmøand36-100mmø)v150–0.9mlongdowel

5、s(150mmø)17TypicalCrossSection18TypicalFloorbeamSection–“W”Line19DesignoftheOrthotropicDeckOrthotropicdeckdesignrequires:•Selectionofadeckconfiguration•Transversedistributionofwheelloads•Servicestressesanddeflections•Globalloadeffects20DesignoftheOrthotropicDeckClosedribsselecte

6、d•Compactness•Torsionalrigidity•Simplicity.21DesignoftheOrthotropicDeckSelectedDetails•Bottomcutout:out-of-planedeflection•Transitionwelds:CJPwithgroundrunoffforstrengthandfatigueresistance•Ribwebtofloorbeam:lightPJPforshear•Decktofloorbeam:filletweldforshear•Ribtodeck:80%PJPbas

7、edonAASHTOLRFDcode22CodeCriteriaforSteelOrthotropicDecksCaliforniaBridgeDesignSpecifications(BDS),Section10.41•Transverseliveloadstressindeckplatenottoexceed30ksi(200Mpa)•Longitudinalribstressesduetocombinedlocalandglobaleffectsdonotexceed125%ofallowable•Deflectionofdeckplatebet

8、weenribs1/300ofribwebspacing•Deflectionoflongit