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JohnHancocxCenter

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Architecture,EngineeringandConstruction

TheJohnHancockCenterisoneofthemostfaemousAsaresulkofthebuildingtaperingsubtlyonallfour

buildingsrepresenting中estructuralexpressioniststyle;sides,itnarrowsby105ft.(32.0mJ)orpitching3.29

theskyscreapersdistinctiveX-bracingandanguler省有王1

fecadehasmadeitanarchitecturaliconnetonlyinpitching5.32deg.onthenorthsouthequatingto8

Chicago,butthroughoutthewerld.reductioninfloorareatp160ft.xto00ft.48.8mx30.0

m)Thisinwardleaningeffectivelyreducestheflocr

TheX-bracingexterierisactualy8ahintthattheareafrom43,725sq.ft.atthebaseto16,000sq.ft.at

thetop.

This“diagonalizedtrussed-tube”isessentiallythe

spinethathelpsthebuildingstanduprightduringTheparkinggarageisaccessedbyBadetached

windandearhquakeevents.Thisisoneoftheconcretespiralrempconsistingofadoublehelix

architecturaltechniquesbuildingusedtoclimbto和人

recordheightswhicheliminatedtheneedforinner和1

supporbeams,greatlyopeningupthefloorplanand

increasingtheusablefloorarea.

Theoverellformcanbedescribedasatruncated

rectangular-pyreamid，Shapedlikeaarhombusor

rhomboidandessentiallyaparallelogramwithunequal

je全amw亏季万om020了多Q5

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