Sears Tower – Willis Tower
At feet, its height surpassed the World Trade Center by feet and was, according to Sears "as tall as the FAA (Federal Aviation Administration) will let us go." For more than twenty years after its completion in , Sears Tower remained the tallest skyscraper, and it is still the largest. From the ground to the top floor, the tower measures 1, feet. The building further increased in height in February of , when two television antennas were added, making its total height 1, feet tall. The Sears Tower is the second tallest free-standing structure in North America, the first being the CN Tower in Toronto, Canada.
After it was completed inthe It held the title for almost 25 years and then was passed onto the Petronas twin towers in Malaysia. As ofthe Sears Tower is kllinois 16 th tallest building in the world and the second tallest in the Western Hemisphere hw the US.
United Airlines has ih operations center and headquarters in the Sears Tower. It has rented nearly 20 floors illinois the biggest occupant in the building. Inthe building was what does the name ken mean as Willis Tower sers part of the lease deal signed with the Willis Group for a section of space in the building.
The Sears Tower is one takl the most popular tourist attractions in Chicago. Over 1 million people visit the observation deck in the building every year. It employed aroundpeople. Inthe company decided to integrate all its offices and employees disbursed around different places in Chicago under one roof. To this end, they sought the consultancy services of a firm to find a location for a new office building. After checking the legalities involved, the consultancy firm offered two locations and Sears executives chose the S Wacker Dr site.
The property was then acquired by buying 15 older buildings from about 99 te. Such a building would be able to provide office space for the burgeoning growth predicted for Sears in the coming years.
The architect and structural engineer team of Bruce Graham and Fazlur Rahman Khan then conceived the design of the building. The structure would consist of 9 square tubes and each of the tubes would more or less be a separate building.
All the 9 different tubular buildings will be built till the 50 th floor. Then the southeast and northwest tubes would stop and the rest 7 tubes would continue to rise. The southwest and northeast tubes would stop at the 66 th floor, while rest continued upwards. The south, east, and north tubes ended on the 90 th floor. The center and west tubes would keep rising how tall is the sears tower in chicago illinois the th floor.
This innovative bundled tube design for a building was very innovative, economic, ni structurally efficient. The The city of Chicago and Sears approved the distinctive design tthe in Aprilthe first steel was laid at the site. The construction of the building completed in just 2 years in May There are black bands on the Sears Tower near the 29 th to 32 nd floors, the 64 th to 65 th floors, the 88 th to 89 th floors, and the th to chicagl floors.
They are known as louvres that facilitate ventilation for service machinery and hide searw belt trusses how to identify a private caller on phone the building.
The building had a fire sprinkler system installed from the very start even though then laws did not require it. Two TV antennas were placed on the roof of the Sears Tower in This increased its overall height to Sears had calculated that the company would occupy a percentage of the space in the building and rent other offices to small business and companies.
It would retake that space once their company grew as predicted. Other businesses also did not take up tenancy in the tower as expected and the building was only 50 percent occupied in the s. Some companies tried to buy the building between andbut were unsuccessful. It was opened to public in June Visitors can feel atll swaying of the tower on windy days. Tourists can take the elevator and reach the deck in around 60 seconds.
During the elevator ride, one can experience the change in pressure as us rises upwards. The views from the deck are how tall is the sears tower in chicago illinois spectacular; on a clear day, one can see iss Lake Michigan, over the plains of the IL state, and to other states like Michigan, Indiana, and Wisconsin.
There is a second observation deck on the 99 th floor. It is used when the above floor is closed. The Skydeck was renovated in Jan Retractable all-glass balconies that could be extended to 1. Tourists can sit on the glass floor of the balconies and look down m below onto the street as well as enjoy more than degree views of the surroundings. Using it enables an individual to save as much as 54 percent off the actual cost one would use to […].
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Built for Sears, Roebuck and Company, the structure reaches floors and a height of 1, feet ( metres), excluding broadcast antennas and their supports, and provides more than , square metres (roughly million square feet) of floor space for offices and other activities. Title America's tallest building, the Sears Tower, Chicago, Illinois Contributor Names Highsmith, Carol M., , photographer. 81 rows · The tallest building in the city is the story Willis Tower (formerly the Sears Tower), Estimated Reading Time: 9 mins.
The Sears Tower opened to tenants in , though construction was not actually completed until Built for Sears, Roebuck and Company , the structure reaches floors and a height of 1, feet metres , excluding broadcast antennas and their supports, and provides more than , square metres roughly 4. In order to consolidate current staff and accommodate anticipated growth, the company hired SOM to design a three-million-square-foot office tower.
The location of the tower was strategically selected for its proximity to expressways and commuter rail lines to benefit Sears employees.
The inhabitants of the bustling office building generated new energy in a formerly stagnant West Loop neighbourhood. This history explains why many Chicagoans still nostalgically refer to the building as the Sears Tower, although it has not technically been the Sears Tower for years.
In the London-based insurance broker Willis Group Holdings later called Willis Towers Watson leased more than , square feet of office space on three floors of the Sears Tower. The contract included naming rights for 15 years. On July 16, , the name of the building was officially changed to Willis Tower. Welded steel frames form vertical tubes that support one another to provide the rigidity needed to limit the lateral sway from wind forces.
Variations in the height of each individual tube also disrupt air currents, which reduces the stress of the wind on the structure. This system minimizes the amount of structural steel required for a building of its great height. The steel was prefabricated, with nearly all welding done off the erection site and bolt connections made at the site.
The innovative vertical-tube design was inspired by the uneven arrangement cigarettes make when they are pushed out of a pack. See also building construction. The building is modular in plan, with nine foot-square, column-free units. These nine square units compose a foot-square base. At the 50th floor two diagonally opposite units stop, forming the first step back. The second step back is at the 66th floor with the other two diagonal units stopping, and the last at the 90th floor with three units stopping, leaving an upper tower of 20 stories.
The exterior is sheathed in black aluminum and bronze -tinted glass. Black bands appear around the building at the 30th—31st, 48th—49th, 64th—65th, and th—th floors, at which points louvers clad the areas devoted to mechanical operations of the building. In the early 21st century the Skydeck underwent a major renovation that included addition of The Ledge, four glass boxes that extend 4. Willis Tower. Article Introduction History Construction Show more.
Videos Images. Additional Info. Print print Print. Table Of Contents. While every effort has been made to follow citation style rules, there may be some discrepancies. Please refer to the appropriate style manual or other sources if you have any questions. Facebook Twitter. Give Feedback External Websites. Let us know if you have suggestions to improve this article requires login. External Websites. Lynn J. See Article History. See the architectural design of Chicago's Willis Tower inspired by a pack of cigarettes.
An overview of Chicago's Willis Tower, including how a pack of cigarettes inspired its architectural design. Know about the wind-resistant architectural designs in Chicago including the bundled tube system used in Willis Tower. A discussion of wind-resistant architectural designs, notably the bundled tube system used in the Willis Tower, Chicago.
Get a Britannica Premium subscription and gain access to exclusive content. Subscribe Now. The Ledge at the Willis Tower, Chicago. See how electricians change the roof lenses of the Willis Tower with different colored lenses. A discussion of how different coloured lenses are used to light the top of the Willis Tower, Chicago. Learn More in these related Britannica articles:. Considerably taller buildings are possible with current technology, but their erection also depends on general economic considerations and the resulting marketability of floor space.
Beyond this height there is another system that appears to have a low premium: the superframe. The story, 1,foot metre Willis formerly Sears Tower remains one of the tallest in the world. History at your fingertips. Sign up here to see what happened On This Day , every day in your inbox! Email address. By signing up, you agree to our Privacy Notice.
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