Arch bridge DesignThrough arch bridgeCantilever bridgeArch bridge structural analysisTied-arch bridgeChenab bridgearch bridge中文The Arch Bridge - Science | HowStuffWorks
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After more than 2,000 years of architectural use, the arch continues to feature prominently in bridge designs and with good reason: Its ...
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By:RobertLamb,MichaelMorrissey&PatrickJ.Kiger
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Updated:Nov12,2021ShareContentonTwitterShareContentonFacebookShareContentonLinkedInShareContentonFlipboardShareContentonRedditShareContentviaEmailTheArchBridge
ThePontduGardaqueduct,whichcrossestheriverGardonnearthetownofVers-Pont-du-GardinsouthernFrance,isasoldastheChristianreligion. Dukas/UniversalImagesGroup/GettyImagesAftermorethan2,000yearsofarchitecturaluse,thearchcontinuestofeatureprominentlyinbridgedesignsandwithgoodreason:Itssemicircularstructureelegantlydistributescompressionthroughitsentireformanddivertsweightontoitstwoabutments,thecomponentsofthebridgethatdirectlytakeonpressure.Tensionalforceinarchbridges,ontheotherhandisvirtuallynegligible.Thenaturalcurveofthearchanditsabilitytodissipatetheforceoutwardgreatlyreducestheeffectsoftensionontheundersideofthearch.AdvertisementButaswithbeamsandtrusses,eventhemightyarchcan'toutrunphysicsforever.Thegreaterthedegreeofcurvature(thelargerthesemicircleofthearch),thegreatertheeffectsoftensionontheundersideofthebridge.Buildabigenougharch,andtensionwilleventuallyovertakethesupportstructure'snaturalstrength.Whilethere'safairamountofcosmeticvarietyinarchbridgeconstruction,thebasicstructuredoesn'tchange.Thereare,forexample,Roman,BaroqueandRenaissancearches,allofwhicharearchitecturallydifferentbutstructurallythesame.Itisthearchitselfthatgivesitsnamesakebridgeitsstrength.Infact,anarchmadeofstonedoesn'tevenneedmortar.TheancientRomansbuiltarchbridgesandaqueductsthatarestillstandingtoday.Thetrickypart,howeverisbuildingthearch,asthetwoconvergingpartsofthestructurehavenostructuralintegrityuntiltheymeetinthemiddle.Assuch,additionalscaffoldingorsupportsystemsaretypicallyneeded.ModernmaterialssuchassteelandprestressedconcreteallowustobuildfarlargerarchesthantheancientRomansdid.Modernarchestypicallyspanbetween200and800feet(61and244meters),butWestVirginia'sNewRiverGorgeBridgemeasuresanimpressive1,700feet(518meters)[source:NOVA].Previous1…234567…8910111213NextPage
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