- He made the case that the structure could be treated in a comprehensive manner in which the three-dimensional buildings structural behavior could be rightly viewed in three dimensions as in a tubular system rather than as a series of planar systems in each principal direction of the building. Before developing the structural systems chart, in 1961 Khan conceived the idea of the hollow thin tube and designed the 43-story DeWitt-Chestnut Apartments (now called the Plaza on Dewitt) using peripheral framed tube in Chicago, which was completed in 1966 [4]. Other variations of the tubular structure are tube-in-tube, braced tube, bundled tube, and partial tube in which the tube is placed as end channels with interior shear wall/shear truss.
Shear Wall Systems: Reinforced concrete shear walls are commonly employed in high-rise buildings to resist lateral forces, owing to their high strength and stiffness.
This particular example perfectly highlights why High-End Apartment Building Structural System Design is so captivating.
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- The 38-story reinforced concrete Brunswick Building using the shear wall-frame interaction principle and the 42-story reinforced concrete Dewitt-Chestnut Apartment Building using the framed tube concept, both located in Chicago and built in 1965, were engineered by Khan. Although the Brunswick Building resembles a tube-in-tube structure, it was designed, without regard for any tubular action, as a shear wall-frame interaction system, where the exterior frames parallel to wind direction were designed for shear wracking, and the three-dimensional behavior of the exterior frames was also captured by cantilever analysis [5], pp.
