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1、英文原文ComponentsofABuildingandTallBuildingsAndre1.AbstractMaterialsandstructuralformsarecombinedtomakeupthevariouspartsofabuilding,includingtheload-carryingframe,skin,floors,andpartitions.Thebuildingalsohasmechanicalandelectricalsystems,suchaselevators,heati
2、ngandcoolingsystems,andlightingsystems.Thesuperstructureisthatpartofabuildingaboveground,andthesubstructureandfoundationisthatpartofabuildingbelowground.Theskyscraperowesitsexistencetotwodevelopmentsofthe19thcentury:steelskeletonconstructionandthepassenger
3、elevator.SteelasaconstructionmaterialdatesfromtheintroductionoftheBessemerconverterin1885.GustaveEiffel(1832-1932)introducedsteelconstructioninFrance.HisdesignsfortheGaleriedesMachinesandtheTowerfortheParisExpositionof1889expressedthelightnessofthesteelfra
4、mework.TheEiffelTower,984feet(300meters)high,wasthetalleststructurebuiltbymanandwasnotsurpasseduntil40yearslaterbyaseriesofAmericanskyscrapers.ElishaOtisinstalledthefirstelevatorinadepartmentstoreinNewYorkin1857.In1889,Eiffelinstalledthefirstelevatorsonagr
5、andscaleintheEiffelTower,whosehydraulicelevatorscouldtransport2,350passengerstothesummiteveryhour.2.Load-CarryingFrameUntilthelate19thcentury,theexteriorwallsofabuildingwereusedasbearingwallstosupportthefloors.Thisconstructionisessentiallyapostandlinteltyp
6、e,anditisstillusedinframeconstructionforhouses.Bearing-wallconstructionlimitedtheheightofbuildingbecauseoftheenormouswallthicknessrequired;forinstance,the16-storyMonadnockBuildingbuiltinthe1880’sinChicagohadwalls5feet(1.5meters)thickatthelowerfloors.In1883
7、,WilliamLeBaronJenney(1832-1907)supportedfloorsoncast-ironcolumnstoformacage-likeconstruction.Skeletonconstruction,consistingofsteelbeamsandcolumns,wasfirstusedin1889.Asaconsequenceofskeletonconstruction,theenclosingwallsbecomea“curtainwall”ratherthanservi
8、ngasupportingfunction.Masonrywasthecurtainwallmaterialuntilthe1930’s,whenlightmetalandglasscurtainwallswereused.Aftertheintroductionof9buildingscontinuedtoincreaserapidly.Alltallbuildingswerebuiltwithaskeleto