Abstract
Structural efficiency of tapered tall buildings has been well recognized, and many tall buildings of tapered forms have been built throughout the world. Tall buildings are built with an enormous amount of building materials. As one of the most efficient structural forms for tall buildings, the contribution of tapered forms to saving structural materials coming from our limited natural resources could be significant. Structural design of tall buildings is generally governed by lateral stiffness rather than strength. This paper systematically studies the structural efficiency of tapered tall buildings in terms of lateral stiffness. Tall buildings of various heights and angles of taper are designed with different structural systems prevalently used for today’s tall buildings, such as diagrids, braced tubes, and core-outrigger systems. The heights of the studied buildings range from 60 to 100 stories, and the corresponding height-to-width aspect ratios in their non-tapered prismatic forms range from 6.5 to 10.8. The angles of taper studied are 1, 2, and 3 degrees. Gross floor area of each building of the same story height is maintained to be the same regardless of the different angles of taper. Based on design studies, comparative evaluation of the various structural systems for tapered tall buildings is presented.
Highlights
Compared with prismatic forms, tapered forms provide many advantageous aspects for structural systems of tall buildings
For today’s very tall buildings built with higher strength structural materials, it is common that lateral-stiffness requirements against wind loads rather than strength govern their structural design [1]
As a prismatic diagrid tall building with diagonals placed at a uniform angle is tapered, theofangle of diagrid members is changed along the height the building
Summary
Compared with prismatic forms, tapered forms provide many advantageous aspects for structural systems of tall buildings. For today’s very tall buildings built with higher strength structural materials, it is common that lateral-stiffness requirements against wind loads rather than strength govern their structural design [1]. Tapered forms help reduce wind loads applied to tall buildings. It is very important to produce building forms that can contribute to structural efficiency for the same purposes. Tapered forms are often more desirable architecturally for ever-increasing mixed-use tall buildings. Amongofmany different aspects of tapered forms, this paper examines comparative efficiency various structural systems employed for tapered tallsystematically buildings, based on lateral stiffness. Efficiency of various structural systems employed for tapered tall buildings, based on corelateral. The angles of taper studied are 1, 2, and 3 degrees
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