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The document summarizes the Sears Tower located in Chicago, Illinois. Constructed in 1974, it stood as the tallest building in the world for over two decades at 110 stories and 1450 feet tall. The building uses a tube-frame structural system of nine bundled steel tubes to support its height. A deep foundation of 114 caissons drilled down to bedrock supports the heavy building loads.

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Reshanth Vangalapudi
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189 views1 page

Presentation 1

The document summarizes the Sears Tower located in Chicago, Illinois. Constructed in 1974, it stood as the tallest building in the world for over two decades at 110 stories and 1450 feet tall. The building uses a tube-frame structural system of nine bundled steel tubes to support its height. A deep foundation of 114 caissons drilled down to bedrock supports the heavy building loads.

Uploaded by

Reshanth Vangalapudi
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PPTX, PDF, TXT or read online on Scribd
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● Structural steel

Location: Chicago, Illinois ● Cladding : black aluminum


Site area: 3 acres structure and bronze tinted vision
glass panels allows natural
Building area: 4,565,844 sq.ft.
lighting of the building and views
Height: 1450 ft, 1730 ft including twin from all exterior walls. Acts as
antennae insulation between exterior and
interior, maintaining a relatively
Number of stories: 110
constant temperature, which helps
Architect and Structural engineers: in minimizing the expansion and
SOM (Skidmore, Owings & Merrill) contraction of the frame.
Year of construction: 1974
Structural system

17 t
Building use: Commercial + office ● Tube construction W
Sears was the biggest retailer ● Internal support columns and bracing.
h ● The frame system is not efficient for larger heights due to large IL
1968 - Decides to build their headquarters quantity of steel required.
Ta 1970 - Groundbreaking and sub structure The building construction is completed in 1974, it ● Khan used the perimeter tube structures inset of a central core. LI
remained the tallest tower in the world for 25 years. ● Made of nine, 75 ft x 75 ft (22.9 m × 22.9 m) square steel tube
lle 1971 - Super structure construction
Now: units S
1974 - Construction completed
st ● National Ranking -2 Tallest in United States ● The tubes are clearly visible from the exterior of the building

SK
SITE :3 ● City Ranking -1 Tallest in Chicago ● Due to the structure's height-to-width ratio, a single framed tube is T
ACRES not adequate
YS ● Bundling tubes increases strength O
CR W
AP E
ER
R`
Shear lag of typical building Reduced shear lag
● Three-foot-thick wall dug around the perimeter of building site.
● Bentonite Clay Slurry poured into excavation panels to prevent ground collapse and infiltration.
● The excavation panels reached approximately 5 stories into the ground.
● With concrete foundation wall in place, the entire site was excavated to 5 0 feet.
● 114 reinforced concrete caissons of varying diameter (6ft - 10ft) were dug another 50’ into the earth.
● Drilled shafts go to the bed rock due to heavy loads.
● Steel jackets filled with concrete is located under each column.
● A 5 -f oot concrete matt was poured at the bottom of the excavation site which tied all caissons
together and became the bottom level of the sears tower.

RESHANTH (11614224) ROLL NO.- B28 AVINASH (11613495) ROLL NO. – B 31 ADVANCE BUILDING TECHNOLOGY ARC 403

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