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Fazlur Khan
Fazlur Rahman Khan (Bengali: ????? ????? ??? Fozlur Rôhman Khan) (April 3, 1929 - March 27, 1982), born in Dhaka, Bengal (now Bangladesh), was a Bangladeshi American structural engineer. He is regarded as the "Einstein of structural engineering" and considered "the greatest structural engineer of the second half of the 20th century" for his constructions of the Sears Tower and John Hancock Center, and for his designs of structural systems that remain fundamental to all high-rise skyscrapers, including the tube structure, X-bracing and sky lobby designs.[1]
BiographyFazlur Rahman Khan hails from the village of Bhandarikandi in Shibchar Upazila, Madaripur District, Dhaka Division. He was born on 3 April 1929, in Dhaka. His father, Khan Bahadur Abdur Rahman Khan, was a renowned educator and high government official in the education department. Khan completed his undergraduate coursework at the Bengal Engineering College, University of Calcutta (Now Bengal Engineering & Science University, Shibpur). He received his bachelor?s degree from the University of Dhaka in 1951 while placing first in his class. A Fulbright Scholarship and a Pakistani government scholarship enabled him to travel to the United States in 1952 where he pursued advanced studies at the University of Illinois at Urbana-Champaign. In three years Khan earned two Master's degrees ? one in structural engineering and one in theoretical and applied mechanics ? and a PhD in structural engineering. In 1955, employed by Skidmore, Owings and Merrill, he began working in Chicago, Illinois. One of the foremost structural engineers of the 20th century, Fazlur Khan epitomized both structural engineering achievement and creative collaborative effort between architect and engineer. He believed that "only when architectural design is grounded in structural realities ? thus celebrating architecture's nature as a constructive art, rooted in the earth ? can the resulting aesthetics ? have a transcendental value and quality." Fazlur Khan's personal papers are held by the Ryerson and Burnham Archives at The Art Institute of Chicago. EducationAs a boy, Khan's father instilled in him the importance of an education, not only early education but a continued education. For this reason, Khan went to undergraduate school and then graduate school. Although Khan was finished with school and now in the workforce, he still continued to learn. He taught himself how to program the new computer system which SOM purchased in 1961. He then taught his colleagues how to use the new programs. Khan realized the value of his education and encouraged his daughter Yasmin along a similar path. However, he did not push her into structural engineering, she found her passion for this on her own. Her experiences with her father influenced her education and her work. Yasmin later wrote many articles and books including Engineering Architecture: The Vision of Fazlur R. Khan, a tribute to her father. Personal InterestsOutside of work, Khan enjoyed spending time with his family (wife Liselotte and daughter Yasmin). He enjoyed singing, poetry, and table tennis. He was also heavily involved with creating public opinion and garnering emergency funding for Bengali people during the 1971 Bangladesh Liberation War. He created the Chicago-based organization known as Bangladesh Emergency Welfare Appeal. InnovationsDr. Fazlur Khan's design innovations improved the construction of high-rise buildings, enabling them to withstand enormous forces generated on these super structures. These new designs opened an economic door for contractors, engineers, architects, and investors, providing vast amounts of real estate space on minimal plots of land. 
The John Hancock Center, designed by Fazlur Khan and completed in 1969. He is noted for his efficient designs for Chicago?s 100-story John Hancock Center and 110-story Sears Tower, the tallest building in the world in its time and still the tallest in the United States since its completion in 1974. He is also responsible for designing notable buildings in Bangladesh. 
Sears Tower, designed by Fazlur Khan and completed in 1974, was the tallest building in the world at the time of its construction Khan's central innovation in skyscraper design and construction was the idea of the "tube" and "bundled tube" structural systems for tall buildings.http://darkwing.uoregon.edu/~struct/resources/pencil/systems/sys13.htmhttp://darkwing.uoregon.edu/~struct/resources/pencil/systems/sys14.htm Afteer 1965, this new structural system of framed tubes was influential in skyscraper design and construction. Khan defined the framed tube structure as "a three dimensional space structure composed of three, four, or possibly more frames, braced frames, or shear walls, joined at or near their edges to form a vertical tube-like structural system capable of resisting lateral forces in any direction by cantilevering from the foundation."[2] Closely spaced interconnected exterior columns form the tube. Horizontal loads, for example wind, are supported by the structure as a whole. About half the exterior surface is available for windows. Framed tubes allow fewer interior columns, and so create more usable floor space. Where larger openings like garage doors are required, the tube frame must be interrupted, with transfer girders used to maintain structural integrity. The first building to apply the tube-frame construction was in the DeWitt-Chestnut apartment building which Khan designed in Chicago. This laid the foundations for the tube structures used in most later supertall skyscrapers, as can been seen in the construction of the World Trade Center, Petronas Towers and Jin Mao Building.[3] Another innovation that Khan developed was the concept of X-bracing. This concept reduced the lateral load on the building by transferring the load into the exterior columns. This allows for a reduced need for interior columns thus creating more floor space. This concept can be seen in the John Hancock Center, built in 1969 One of the most famous buildings of the structural expressionist style, the skyscraper's distinctive X-bracing exterior is actually a hint that the structure's skin is indeed part of its 'tubular system'. This idea is one of the architectural techniques the building used to climb to record heights (the tubular system is essentially the spine that helps the building stand upright during wind and earthquake loads). This X-bracing allows for both higher performance from tall structures and the ability to open up the inside floorplan (and usable floor space) if the architect desires. Original features such as the skin, pioneered by Fazlur Khan, have made the John Hancock Center an architectural icon. The first sky lobby was also designed by Khan for the John Hancock Center. Later buildings with sky lobbies include the World Trade Center, Petronas Twin Towers and Taipei 101. The 44th-floor sky lobby of the John Hancock Center also features the first high-rise indoor swimming pool, which remains the highest in America.[4] The last major buildings constructed by Khan were the One Magnificent Mile and Onterie Center in Chicago, which employed his bundled tube and trussed tube system designs respectively. In contrast to his earlier buildings which were mainly steel, his last two buildings were concrete. His earlier DeWitt-Chestnut apartment building, built in 1965 in Chicago, was also a concrete building with a tube structure.[3] Professional Milestones
Other Honors
Quotes"The technical man must not be lost in his own technology; he must be able to appreciate life, and life is art, drama, music, and most importantly, people." Fazlur Khan (Engineering Legends, Richard Weingardt) ReferencesFurther reading
External links
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