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Advantages & Disadvantages - Beam Bridge Types ...

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form beam bridges are normally the most cost-effective type of beam construction that is used for beam bridges with short spans. PagecontentBeamBridgeBasicsKindsOfBeamAdvantages&DisadvantagesofaBeamBridgeModernBeamBridgesReferencesBeamBridgeBasicsBeambridgesareacommontypeofbridgeamongthetrussbridgesandthearchbridges.Wideflangerolledformbeambridgesarenormallythemostcost-effectivetypeofbeamconstructionthatisusedforbeambridgeswithshortspans.Thebeamsgenerallyarelocatedatfixedgapsbyusingconstructioncranes,paralleltothetrafficdirection,betweenabutmentsorpiers.Aconcretedeckisplacedonthemainflangetoprovidelateralassistanceagainstbuckling.Bridgedeckformsareconstructedaccordingtothetrafficloadandotherdesigncharacteristics.Diaphragmsarefixedbetweenthebeamstoprovideadditionalreinforcement,andalsofacilitatelateraldistributionofloadstothebridgebeams.imagecredit:wikimedia.org/BotaurusKindsOfBeamNormally,thedeckofabeambridgeismadeofreinforcedconcreteormetal.Crossbracingisusuallyusedbetweenthebridgebeamstoincreasetheloadbearingcapacityofthebeams.Anothertechniqueofincreasingthebeamloadcapacity,withuseofminimumwebdepth,isbytheadditionofhaunches,locatedatthesupportedends.Generally,themiddlesectionhasisacustomaryformwithaparallelflange.Theangledorcurvedflangedendsarebolted,orriveted,bytheuseofjoiningplates.Sincetransportationofheavyandlongbeamstothebridgesiteisdifficult,shortconvenientbeamlengthsarenormallyconnectedonsitebyusingspliceplates.imagecredit:wikimedia.org/DanielCaseAdvantages&DisadvantagesofaBeamBridgeBeamBridgeAdvantagesBeambridgesarehelpfulforshortspans.Longdistancesarenormallycoveredbyplacingthebeamsonpiers.BeamBridgeDisadvantagesBeambridgesmaybecostlyevenforrathershortspans,sinceexpensivesteelisrequiredasaconstructionmaterial.Concreteisalsousedasbeammaterial,andischeaper.However,concreteiscomparativelynotthatstrongtowithstandthehightensileforcesactingonthebeams.Therefore,theconcretebeamsarenormallyreinforcedbyusingsteelmesh.Whenlongspansarerequiredtobecovered,beambridgesareextremelyexpensiveduetothepiersrequiredforholdingthelongbeams.Buildingofthesupportpiersmaynotalwaysbepossibleduetothelimitationofspace.Bridgebeamsarelikelytodroopbetweenthepiers,duetothedifferentbridgeloadsactingdownwards.Theforcesactingupwardsatthepiersupportsalsoinfluencethedroopingeffect.Thesaggingtendencyisincreasedwhenthebridgespanorloadisincreased.ModernBeamBridgesThesectionsofthecurrentsteelbeambridgesaregenerallyfabricatedatappropriatelocations,andthentransportedtothebridgeconstructionsite.Weldingofthebridgeelementsisperformedattheconstructionsite.Subsequently,thesectionsarefixedwiththesupports.Theshapeoftheboxesisdesignedtobetrapezoidsincethisconfigurationfacilitatespassingofthewind,withoutdamagingthebridgestructure.Themaintenanceofasteelbeambridgeisextremelyexpensive.Concretebeambridgesbeingmoreeconomical,arethereforecommonlyused.Theconcretebeamissimple,anddoesnotneedagreatdealofmaintenance.Concretebeamsincludeadequatesteelfortheirreinforcement.ReferencesPBS,BeamBridgeTongjiUniversity,BeamBridgesPurdueUniversity,BridgeConstruction« PreviousElectronicsEngineeringJobs:InsighttoElectronicsEngineeringasaCareerOptionNext »WhatareStandardSIUnitsofMeasurement?FundamentalUnitsreportthisadLoadingComments...RecentPostsCommercialEnergyUsage:LearnaboutEmissionLevelsofCommercialBuildingsTop10CivilEngineeringCollegesBestReasonstoStudyCivilEngineeringTimetoUpgradeYourHVAC?Here'sWhatYouNeedtoKnow4MostCommonHVACIssues&HowtoFixThemTagsCivilEngineering(474) ElectricalEngineering(451) MarineEngineering(810) MechanicalEngineering(1377)CategoriesBuildingConstruction&DesignCADandAutoCADCommercialApplications&ElectricalProjectsConcreteTechnologyConsumerAppliances&ElectronicsEnergy&PowerPlantsFluidMechanics&HowitRelatestoMechanicalEngineeringGeotechnicalEngineeringHobbyist&DIYElectronicDevices&CircuitsHVAC:Heating,Ventilation&Air-ConditioningHydraulicsinCivilEngineeringLifeatSeaMachineandMechanismDesignManufacturingTechnologyMarineHistoryMarineMachinery,Engines&ControlsNavalArchitecture&ShipDesignforMarineEngineersPowerTransmissionandDistributionRoboticsStructuralEngineeringThermodynamicsxx

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