Tall Building case studies - Tall Buildings: Structural Systems and Aerodynamic Form - page 136

The ground floor of the John Hancock Center has a rectangular cross-section approx-
imately 50×80 m with a distance of 17.5 m of lease span - between the core and the
perimeter - on the long face and the top floor has a rectangular cross-section approxi-
mately 30×49 m with a distance of 7.5 m of lease span on the short face ( Figure 4.31 ).
In the John Hancock Center, perimeter columns are spaced at approximately 12 m
centres on the long faces and at approximately 7.5 m centres on the short faces of
the building, with exterior X-braces on the facade and spandrel beams connecting all
these together ( Figure 4.32 ).

~80-49m

(from bottom to top)

Figure 4.31

John Hancock Center plan

Exterior
X-brace

Perimeter
column

Spandrel
beam

Figure 4.32

John Hancock Center structural axonometric