![]() ![]() These bundled tubes were interlocked and divided into 75 x 75 feet square blocks that were joined together to make a cellular tube frame. Reinforced concrete mats were used to tie up the caissons together for better stability and support. Nine bundled structural tubes were used that stood on reinforced concrete caissons that rested on bedrock. 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.īundled tube construction was used in constructing this building which was a new concept at that time. The skin of this building is formed with a glare-reducing glass curtain wall that is made of black aluminum and bronze tint. This tower is built with structural steel that was prefabricated and then joined with bolts on the construction site. It remained the tallest building in the world for 25 years until it was surpassed by Towers Petronas built in Kuala Lumpur, Malaysia in the year 1998. Later on, it eventually exceeded the World Trade Center by about 30 meters. ![]() Initially, the design of the building resembled a box-like structure but the real estate advisors and architects were determined to make the building taller by increasing its height, adding more floors. This tower became a business hub for a lot of companies in Chicago and till now it remains a core of activity in Chicago. Moreover, this tower was developed by Sears, Roebuck & Company who were the largest retailer in the world with 350,000 employees. Khan, the Structural Engineer Myron Goldsmith, the Engineer along with architects named Owings and Merrill Skidmore, Bruce Graham. People behind the construction of this tower were - Fazlur R. It cost about 175,000,000 dollars to build this tower which proved to be quite a lot of money at that time. The weight of this building is 225,000 tons and inside the building, there are 104 elevators. 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. This tower is located at 233 South Wacker Drive, in the district of Chicago, Illinois, United States. Willis Tower is also known as Sears Tower and was built between 1970-1974. Willis Tower, Chicago: All you need to know Articles > Willis Tower, Chicago: All you need to know ![]()
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