It provides a world-class platform for health facility, conference centers with its stunning technological features. It broke several records with its height and its Skydeck attracts several tourists worldwide for its commendable beauty. The design of this building is remarkably great as expanded spaces could be utilized for office purposes leaving more future scope for its expansion. This tower has 12,000 occupants and is visited by around 25,000 people each day that come for various businesses and other works. In the case of snowfall, the ledge of this tower has heat tracing to melt the snow that falls on the glass of the building. This building comprises 16,100 windows which are machine washed by roof-mounted robots for thorough cleaning. The area of this building is 4.5 million gross square feet that is equal to around 101 football fields. This tower was inaugurated in 1973 and it took 3 years to build by 2,000 workers which is quite astonishing as it took 20 years for the Ancient Egyptians to build the pyramids at Giza. The weight of this tower is equal to almost 20,000 city buses that are around 445,000,000 lbs in weight. This tower is the home to the most viewed public area in the United States due to its unique design and transparency of the deck platform that gives the floating feeling in the sky. In the present world, it stands as the fifth tallest structure in the world that is the free-standing, twelfth tallest building in the world and the second tallest building in the Western Hemisphere and North America. This tower has some surprising specifications that still now inspire several engineers, designers and architects. There are some amazing points about this building which makes it a landmark in the world of civil engineering. Also, a Skydeck is present on the 103rd floor which is visited by 1.3 million tourists from all over the world to enjoy the scenic beauty of Chicago. At the top of the tower, there are antennas for local television and radio broadcasts. It proved to be quite cost-effective as nearly 10 million dollars were saved in structural steel due to that. This opened the door of opportunities for big open space offices at lower levels of the building and the smaller floors were increased in height without any obstruction. Khan, then the floor sizes were reduced by reducing the square blocks as per requirements. At first, a setback was observed in meeting the client requirements as more spaces were needed but when this tubular system was employed by the Bangladeshi-American Structural Engineer Fazlur R. 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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