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1、BuildingSkyscraperstoHeightsResearchInstructor:XiaChunhongBuildingSkyscraperstoHeightsResearchWiththeincreaseoftheeconomy,theconstructionofbuildingshavebecometallerandtaller.Sothisessaydiscussthetrends,architectsandinnovationbehindworld'stallestbuildings.Inthe20thcentury,thesky
2、scraper,iconofmodernityandengineeringprowess,cametodominateallmajorurbanlandscapes.Almosteverylargecityintendonbuildingitsskyscraperasitslandmark.Humanshavestrivedtobuildupinspiringandhighstructures,however,thewallsofthebasesuchasthepyramidshadtobethickenedtosustainthehugeamoun
3、tsofweightexerteddownwardbymultiplestoriesstackedatoponeanother.Untilinthe19thcentury,advancesinmanufacturingironandsteelaswellaselevators,plumbingandelectricitymadeitpossibletosupportgreatamountsofweightwithouttakingupmuchspace.Economicfactorsdrovetheconstructionofbuildingstha
4、twentupinsteadofout;aspreciousdowntownspacebecamemoreexpensivetheonlywayforbuildingstoexpandwasskyward.Sointhe20thcentury,skyscraperconstructiontrulyemerged.Twobuildingsbegunin1929,theChryslerBuildingandtheBankofManhattanTowerbecametherepresentativeofthistimes,andtheChryslerrea
5、chingtoaheightof1,046feet.Andafterthen,the“world’stallest"hadbeenchangedmoreandmorequickly.In1974,constructionofChicago'sSearsTowerbecome“theworld’stallest”reaching1,450-foot.4Sincethe1990s,theactionshiftedaroundtheglobetoAsia.CountriessuchasMalaysiaandChinaconstructingtheworld
6、'stallestbuildingwasadramaticwayforacitytoannounceitspresenceasacommercialandfinancialcapital.Forexample,theTaipei101Tower,completedin2003andsettoopenin2004,reachto1,667feet.Asiaisaperilousregioninwhichtoerecttallbuildingsbecauseitisbesetwithearthquakesandtyphoons,sothenewAsias
7、kyscrapersincorporatesafetyinnovationstowithstandtheforcesofnature.Toendureearthquakes,theTaipei101Towerincludesimmenseweldedsteelcolumnscombinedwithamassivesteelcagewrappedaroundtheentirebuildingthatisdesignedbendtoabsorbseismicenergy.TheSeptember11attackraisedmanyquestionsabo
8、utskyscrapersafety.Somemeasureswerecomeupwith:incorpor
