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On the 50th, 66th, 90th floors the numbers of tubes reduce by two or more. - Columns are sloped inward over three stories. As of Thursday, the iconic Chicago, Illinois, skyscraper is now named Willis Tower. In unseren Ranglisten sehen Sie als Kunde echt nur die besten Produkte, die unseren enorm strengen Maßstäben erfüllen konnten. The company that commissioned the structure was Roebuck & company, the company used the tower as it new headquarter in the 1970s. (Khan, 1976), In 2010, the tower was renamed from Sears tower to Willis Tower after Willis Group Holding is the largest tenant in the tower. In 1969, Sears, Roebuck and company was the largest retailer in the USA. structure, and separate 6-story Office Annex and 2-story Pool Annex. Fazlur Rahman Khan (Bengali: ফজলুর রহমান খান, Fozlur Rôhman Khan; 3 April 1929 – 27 March 1982) was a Bangladeshi-American structural engineer and architect, who initiated important structural systems for skyscrapers. Sears Tower is history. The sheikhs are inspired by ultra-modern architecture and engineering, where well known inland and offshore structures have been built for example palms island, Burj-al-Arab, emirate tower and ect. In case of Willis Tower (Sear tower), Roebuck & company as result of business expansion commissioned the construction of the tower for its new headquarter in the 1970s. A structural engineering and architecture firm based in Chicago called Skidmore, Owings and Merrill (SOM) was hired to design the structure. For nearly 25 years after its completion, the Willis Tower, formerly known as the Sears Tower, held the title of tallest building in the world. HANCOCK AND ONTERIE BUILDINGS USA 74 Steel, 344 m RC, 174 m The strength of the building’s structural system is expressed in its facade. Sears, Roebuck and Company paid for it to be built in August 1970. It was the form of the steel structure used for the Sears (now Willis) Tower in Chicago. (Bennett, P.44) The Sears Tower, Chicago, USA, in 1974, 110 stories high used the Bundled tube. In contrast at the time of the construction of the Willis Tower (Sear Tower) in 1970’s sustainability was not an important consideration for developers, as result the designers did not take in to account any criteria for designing green building. - They form a soft tube. March 2000, Dubai Financial Market (DFM) was established, its trading volume was at about 400billion shares worth total of $95 billion in total. In 1900 the technology of steel frame developed in various structures in Chicago and New York where advancing to constructing skyscraper from only steel frame. Willis Tower was purchased by Blackstone in 2015 for $1.3 billion. Sears Tower • Location: Chicago, Illinois • Project Completion: 1974 • Site Area: 3 acres • Project Area: 4,565,844 ft2 (105 acres) • Number of Stories: 110 • Building Height: 1,450 ft (442 m) • Market: Commercial + Office • 3.8 million rentable square feet (89 acres) • 159,000 square feet of retail space. Sears Tower was the last supertall building constructed during the International architecture period, and SOM's interpretation of the style is remarkably bold and awe-inspiring. Willis Tower (Sears Tower) Engineering. (Wu Li-sha,2011), Working with Eco Tech International and Steven Leach Associates have helped Taipei 101 to produce its green features. From the ground to the roof it is 442 meters (1,450 feet) tall. This tower is located at 233 South Wacker Drive, in the district of Chicago, Illinois, United States. The surface is divided into 110 apartments, 108 above ground, which is accessed with 104 elevators, 16 of which are double height. Vertical Circulation • The Sears Tower’s 104-cab elevator system divides the building into three separate zones, with sky lobbies in between at levels 33-34 and 66-67. This system will provide 15 million gallons of water every year. Structural units called ‘Christmas trees’ allowed for a 95% reduction in welding on the job site. Text description provided by the architects. Selbstverständlich ist jeder Sears tower rund um die Uhr im Internet im Lager und kann somit direkt gekauft werden. The Tower and Podium structures The tubes are connected at different levels with truss belts. (Khan FR, 1976), Willis tower experiences lateral wind where the structure acts as a cantilevered tube with various inertia because of column layout. However, the Taipei Tower 101 has been designed by C.Y Lee & partners with the innovative design to be the second tallest tower in the world and also to be able to withstand typhoon and earthquake. 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