The Willis Tower in Chicago is a 108-story skyscraper that was the tallest building in the world when completed in 1974. It was designed by Skidmore, Owings and Merrill with Fazlur Rahman Khan and Bruce Graham. The tower uses a structural system of prefabricated steel joined with bolts on site. It has a glass curtain wall that helps regulate temperature and control the expansion and contraction of the building's frame.

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FRAME STRUCTURE
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MA'AM.AR ASMA BATOOL
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“You can dream, create, design, and build the most
wonderful place in the world.

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CASE STUDY WILLISTOWER, CHICAGO
 The Willis Tower is a 108-story, 1,450-foot
(442.1 m) skyscraper in Chicago. Architect:
Skidmore, Owings and Merrill
Fazlur Rahman Khan
Bruce GrahamConstruction started in 1970. The
tower has 108 stories as counted by standard
methods, though the building's owners count the
main roof as 109. Att completion in 1974, it
surpassed the World Trade Center in New York
City to become the tallest building in the world .

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 The Willis Tower remains the
third tallest building in the
Americas and the Western
Hemisphere. With a pinnacle
height of 1,729 feet (527 m), it
is the third-tallest freestanding
structure in the Americas, 86
feet (26.2 m) shorter than
Toronto's CN Tower. It is
the eighth-tallest freestanding
structure in the world by
pinnacle height.

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 This tower is built with structural
steel that was prefabricated and
then joined with bolts on the
construction site. The skin of this
building is formed with a glare-
reducing glass curtain wall that is
made of black aluminum and
bronze tint. This skin acts as an
insulator that maintains a constant
temperature between the exterior
and interior of the building which
in turn helps in controlling the
expansion and contraction of the
frame of the building.

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