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7/21/2019 John Han Cock Center Final
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JOHN HANCOCK
CENTRE
TALL STRUCTUREohn Hancock Center, Chicago
7/21/2019 John Han Cock Center Final
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JOHN HANCOCK
CENTRE
General informationArchitect: Bruce Graham/SOM
Type: mixed useLocation: Michigan Avenue,
Chicago,!!inois,
"nited StatesStarted: #$%&
Comp!eted: #$'()eight Antenna spire: #,&(( +t -&' m.oo+: #,#0' +t 1-- m.
Top 2oor #,('3 +t 10$ m.
O4servatory #,(1( +t 1#- m.Technical detail5!oor count: #((5!oor area: 0,'$$,$'1 +t6 0%(,#0% m6.7!evators: -0
To8er height 1-- meters
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JOHN HANCOCK
CENTRE
!loor
A. #9&: commercia!,
B. %9#0: paring,C. #19-#: o;ce<. --9$0: apartment,7. $19#((: te!evision,
o4servatory,restaurant, mechanica!
Str"ct"ral #etail$
Construction system: stee!+rame
=ote > Giant 4racing criss9cross+acade?
A
%
C
#
E
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JOHN HANCOCK
CENTRE
•The tapered form resulted from structural
concepts to reduce cost and decrease the
"sail effect“ of wind loads.
•The tapered form is also accredited to the
zoning of building functions with offices, which
require more open floor area on the lower
levels, then a zone of efficiency apartments
that require a deeper plan than the multi-bedroom dwellings at the top that have more
rooms requiring eterior frontage.
•The unique diagonal bracing, an idea used
earlier by !# in the $lcoa %uilding in !an
&rancisco of the same year, is the result of astructural concept to achieve maimum wind
bracing with minimum steel.
CO=C7=S
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JOHN HANCOCK
CENTRE
STRUCTURE
•'-braces used in the fa(ade.•The construction was designed by the engineer
&azlur )ahn and architect %ruce *raham from!+idmore, wings #errill. &azlur )ahn
devised the frame-tube system, which he also
implemented in the sears tower.
•This new construction method was made
possible by new technologies, li+e more
advanced software and new developments in
steel. iagonal shaped braces
•ew construction method, made possible for
)ahn to design constructions which could resistthe strong wind forces more effectively by having
the forces absorbed by all three dimensions of
the building.
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JOHN HANCOCK
CENTRE
•@ua!itative diagram demonstrating the redistri4utiono+ vertica! !oads in the trussed tu4e system o+ the
)ancoc? The graph !e+t. visua!!y demonstrates thegradua! convergence o+ the !oading +rom the top tothe co!umns at the 4ottom the ta!! 4ui!ding diagramright. sho8s ho8 the magnitude signied 4y !inethicness. o+ the axia! !oads in the mem4ersdiminishes as the !oads trave! do8n the to8er?
1--m
&(m
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JOHN HANCOCK
CENTRE
CONCLUS&ON
• AS 7 )7G)T O5 T)7 B"L<=G S 7DC77<=G T)7 E7G)TO5 T)7 "7 5LOOS S)O"L< B7 7<"C7<?
• 5O T)S "OS7 = T)S CAS7 )OLLOE CC"LA ST77LS7CTO= )AS B77= "S7<?
• 5O G<TF "OS7 D9BAC7S A7 "S7<?
• 5O C)7C=G O5 STABLTF <F=AMC A=ALFSS S)O"L< B7<O=7 = HAO"S CO=<TO=S O5 =AT"AL CALAMT7S?
