Bridge engineering handbook桥梁工程手册-18悬索桥.pdf

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1、18SuspensionBridges18.1IntroductionOrigins•EvolutionofModernSuspensionBridges•DimensionsofSuspensionBridgesintheWorld18.2StructuralSystemStructuralComponents•TypesofSuspensionBridges•MainTowers•Cables•SuspendedStructures•Anchorages18.3DesignGeneral•AnalyticalMethods•DesignCriteria•Wind-Resistan

2、tDesign•SeismicDesign•MainTowers•Cables•SuspendedStructuresAtsushiOkukawa18.4ConstructionShuichiSuzukiMainTowers•Cables•SuspendedStructuresIkuoHarazaki18.5FieldMeasurementandCoatingsHonshu–ShikokuBridgeAuthorityLoadingTest•FieldObservations•CoatingJapanSpecification•MainCableCorrosionProtection1

3、8.1Introduction18.1.1OriginsTheoriginsofthesuspensionbridgegobackalongwayinhistory.Primitivesuspensionbridges,orsimplecrossingdevices,weretheforebearstotoday’smodernsuspensionbridgestructures.Suspensionbridgeswereconstructedwithironchaincablesover2000yearsagoinChinaandasimilarrecordhasbeenlefti

4、nIndia.Theironsuspensionbridge,assumedtohaveoriginatedintheOrient,appearedinEuropeinthe16thcenturyandwasdevelopedinthe18thcentury.Althoughwroughtironchainwasusedasthemaincablesinthemiddleofthe18thcentury,arapidexpansionofthecenterspanlengthtookplaceinthelatterhalfofthe19thcenturytriggeredbythei

5、nventionofsteel.Today,thesuspensionbridgeismostsuitabletypeforverylong-spanbridgeandactuallyrepresents20ormoreofallthelongestspanbridgesintheworld.18.1.2EvolutionofModernSuspensionBridgesBeginningoftheModernSuspensionBridgeThemodernsuspensionbridgeoriginatedinthe18thcenturywhenthedevelopmentoft

6、hebridgestructureandtheproductionofironstartedonafull-scalebasis.JacobsCreekBridgewascon-structedbyFinleyintheUnitedStatesin1801,whichhadacenterspanof21.3m.Thebridge’sdistinguishingfeaturewastheadoptionofatrussstiffeninggirderwhichgaverigiditytothebridge©2000byCRCPressLLCtodistributetheloadthro

7、ughthehangerropesandthuspreventexcessivedeformationofthecable.TheconstructionoftheCliftonBridgewithacenterspanof214m,theoldestsuspensionbridgenowinserviceforcars,beganin1831andwascompletedin1864intheUnitedKingdomusingwroughtironch