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The Beam Bridge - Science | HowStuffWorks

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Bridge building doesn't get any simpler than this. In order to build a beam bridge (also known as a girder bridge), all you need is a rigid ... HealthScienceHome&GardenAutoTechCultureMoneyLifestyleEntertainmentAdventureAnimalsQuizzesSubmitSearchSignupforourNewsletter!MobileNewsletterbannerclose​HowStuffWorksNewsletterMobileNewsletterchatcloseMobileNewsletterchatdotsMobileNewsletterchatdotsMobileNewsletterchatdotsMobileNewsletterchatavatarMobileNewsletterchatsubscribeHealthScienceHome&GardenAutoTechCultureMoneyLifestyleEntertainmentAdventureAnimalsQuizzes MoreMoreMoneyLifestyleEntertainmentAdventureAnimalsQuizzesPrevNEXTAdvertisementHowStuffWorksScienceEngineeringCivilEngineering HowBridgesWork PrevNEXT By:RobertLamb,MichaelMorrissey&PatrickJ.Kiger  |  Updated:Nov12,2021ShareContentonTwitterShareContentonFacebookShareContentonLinkedInShareContentonFlipboardShareContentonRedditShareContentviaEmailTheBeamBridge TheForthBridgeacrosstheFirthofForthinEdinburgh,Scotlandisabeambridge. MartinBerry/LoopImages/UniversalImagesGroup/GettyImagesBridgebuildingdoesn'tgetanysimplerthanthis.Inordertobuildabeambridge(alsoknownasagirderbridge),allyouneedisarigidhorizontalstructure(abeam)andtwosupports,oneateachend,torestiton.Thesecomponentsdirectlysupportthedownwardweightofthebridgeandanytraffictravelingoverit.However,insupportingweight,thebreambridgeenduresbothcompressionalandtensionalstress.Inordertounderstandtheseforces,let'suseasimplemodel.AdvertisementIfyouweretotakeatwo-by-fourandlayitacrosstwoemptymilkcrates,you'dhaveyourselfacrudebeambridge.Nowifyouweretoplaceaheavyweightinthemiddleofit,thetwo-by-fourwouldbend.Thetopsidewouldbendinundertheforceofcompression,andthebottomsidewouldbendoutundertheforceoftension.Addenoughweightandthetwo-by-fourwouldeventuallybreak.Thetopsidewouldbuckleandthebottomsidewouldsnap.Manybeambridgesuseconcreteorsteelbeamstohandletheload.Thesizeofthebeam,andinparticulartheheightofthebeam,controlsthedistancethatthebeamcanspan.Byincreasingtheheightofthebeam,thebeamhasmorematerialtodissipatethetension.Tocreateverytallbeams,bridgedesignersaddsupportinglatticework,oratruss,tothebridge'sbeam.Thissupporttrussaddsrigiditytotheexistingbeam,greatlyincreasingitsabilitytodissipatethecompressionandtension.Oncethebeambeginstocompress,theforcespreadsthroughthetruss.Yetevenwithatruss,abeambridgeisonlygoodforalimiteddistance.Toreachacrossagreaterlength,youhavetobuildabiggertrussuntilyoueventuallyreachthepointatwhichthetrusscan'tsupportthebridge'sownweight.Braceyourselfforsomeseriousstatsontrussbridgesonthenextpage.Previous1…2345…678910111213NextPage​ CiteThis! Pleasecopy/pastethefollowingtexttoproperlycitethisHowStuffWorks.comarticle:Copy RobertLamb,MichaelMorrissey&PatrickJ.Kiger "HowBridgesWork" 1April2000.HowStuffWorks.com. 4March2022 Close Print | CitationGamesCanYouSolveThisRiddle?TryOurCrosswordPuzzles!CanYouSolveThisRiddle?MoreAwesomeStuffAdvertisementAdvertisementAdvertisement

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