Introduction
Willis Tower is also known as Sears Tower and was built between 1970-1974. This tower is located at 233 South Wacker Drive, in the district of Chicago, Illinois, United States. The total height of this tower is 5273 m that includes the roof height of 442.14 m and the top floor height of 412.69 m. The weight of this building is 225,000 tons and inside the building, there are 104 elevators. It cost about 175,000,000 dollars to build this tower which proved to be quite a lot of money at that time. People behind the construction of this tower were - Fazlur R. Khan, the Structural Engineer; Myron Goldsmith, the Engineer along with architects named Owings and Merrill Skidmore, Bruce Graham. Moreover, this tower was developed by Sears, Roebuck & Company who were the largest retailer in the world with 350,000 employees. This tower became a business hub for a lot of companies in Chicago and till now it remains a core of activity in Chicago...
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https://civilengineeringbible.com/article.php?i=274
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