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The Willis Tower, originally and still commonly referred to as the Sears Tower, is a 110-story, 1,451-foot (442.3 m) skyscraper in the Loop community area of Chicago in Illinois, United States. Designed by architect Bruce Graham and engineer Fazlur Rahman Khan of Skidmore, Owings & Merrill (SOM), it opened in 1973 as the world's tallest ...
Fazlur Rahman Khan (Bengali: ফজলুর রহমান খান, Fazlur Rôhman Khan; 3 April 1929 – 27 March 1982) was a Bangladeshi-American [3] structural engineer and architect, who initiated important structural systems for skyscrapers.
The tallest building in the city is the 110-story Willis Tower (also known as the Sears Tower), which rises 1,451 feet (442 m) in the Chicago Loop and was completed in 1974. [ 2 ] [ 3 ] Sears Tower was the tallest building in the world upon its completion, and remained the tallest building in the United States until May 10, 2013. [ 4 ]
The nearly-identical buildings were the tallest in the world until being surpassed by Chicago's Sears Tower in 1973. The north tower stood just six feet taller than its counterpart.
1994 - Sears, Roebuck & Company sells the building to reduce its debt. 1996 - The Petronas Twin Towers surpass the Sears Tower in height to become the world’s tallest buildings at 1,483 feet each.
Formerly known, and still commonly referred to, as the Sears Tower. It was the tallest building in the world from 1974 until 1998. It is the third-tallest building in the Western Hemisphere and the 26th-tallest building in the world. [7] [8] 4 111 West 57th Street: New York City: United States 435 (1,428) 84 2021 Also known as Steinway Tower.
In the 1970s, SOM pioneered a new era of skyscraper design with its work in Chicago, including the John Hancock Center (completed 1970) and Willis Tower (formerly Sears Tower), which became the world's tallest structure upon its completion in 1973 and remained so for more than 20 years.
Earthquake engineering software PROKON: Structural analysis and design software Realsoft 3D: General 3D analysis and design software Revit: BIM & 3D modeling software applied for civil & structural engineering RFEM: 3D structural analysis & design software SDC Verifier: Structural verification and code-checking according to different industrial ...