![]() The structure was known as the Sears Tower from its construction until the naming rights were included in a 2009 lease with the Willis Group. The lower half of the tower was originally occupied by retail company Sears, which had its headquarters there until 1994, while the upper stories were rented out. The base of the building contains a retail complex known as the Catalog. The facade is made of anodized aluminum and black glass. The tower has 108 stories as counted by standard methods, though the building's owners count the main roof as 109 and the mechanical penthouse roof as 110. Graham and Khan designed the building as nine square " tubes", clustered in a 3×3 matrix seven of the tubes set back at upper floors. The building occupies a site bounded by Franklin Street, Jackson Boulevard, Wacker Drive, and Adams Street. Each year, more than 1.7 million people visit the Skydeck observation deck, the highest in the United States, making it one of Chicago's most popular tourist destinations. It is the third-tallest building in the Western Hemisphere, as well as the 23rd-tallest in the world. Designed by architect Bruce Graham and engineer Fazlur Rahman Khan of Skidmore, Owings & Merrill (SOM), it opened in 1973 as the world's tallest building, a title that it held for nearly 25 years. The Willis Tower, originally the Sears Tower, is a 110- story, 1,451-foot (442.3 m) skyscraper in the Loop community area of Chicago in Illinois, United States. Archived from the original on September 23, 2015. Frangopol, the first holder of Lehigh's Fazlur Rahman Khan Endowed Chair of Structural Engineering and Architecture.September 1973 50 years ago ( September 1973)ġ04, with 16 double-decker elevators, made by Westinghouse, modernized by Schindler Group and recently remodernized by Otis Elevator CompanyĪon Fire Protection Engineering, formerly Schirmer Engineering Corporation (Fire) ![]() Khan Distinguished Lecture Series has been initiated and organized by Dan M. Though presented primarily from a structural engineering perspective, the presentation should be accessible to anyone interested in tall buildings. All of these developments will be explored with a particular emphasis on the fundamental engineering principles driving the evolution of these structures. ![]() The Evolution of the Skyscraper: The presentation will outline the history of the skyscraper - the invention of the safe passenger elevator, which made tall buildings usable the invention of the metal-framed structure, which made them economical the rapid increase in height from the 10-story Home Insurance Building in 1885 to the 102-story Empire State Building just 46 years later the stagnation in height for many years even as structural materials and techniques improved rapidly the present surge in super-tall buildings and trends for the future. in civil engineering from the University of Illinois at Urbana-Champaign and is licensed to practice engineering in 44 states. He was elected to membership in the National Academy of Engineering in 2005. Nair chairs the AISC Committee on Specifications and is a past chairman of the Council on Tall Buildings and Urban Habitat. His work has garnered numerous awards, including four AISC “Prize Bridge” awards and six annual “Most Innovative Structure” awards from the Structural Engineers Association of Illinois. Nair has worked for Teng and Associates and its successor firm exp since 1995 in Chicago, and before that was a principal at RTKL Associates in Baltimore and Alfred Benesch and Company in Chicago. ![]() His work has focused on structural engineering for large architectural and civil engineering projects, including the longest tied-arch bridge span in the world and many high-rise buildings. Shankar Nair, Senior Vice President exp US Services Inc., and Past Chairman CTBUH: Shankar Nair has more than 45 years of experience in structural engineering as a practicing structural designer, researcher, author, and lecturer. Location: Sinclair Lab Auditorium, Lehigh University, 7 Asa Drive, Bethlehem, PA (click to view video) You need Javascript to use the previous link or use click here to view video Senior Vice President exp US Services Inc., and Past Chairman CTBUH ![]()
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