© 2007 University of Sydney. All rights reserved. Architectural Science Review www.arch.usyd.edu.au/asr Volume 50.3, pp 205-223 Invited Review Paper Structural Developments in Tall Buildings: Current Trends and Future Prospects Mir M. Ali† and Kyoung Sun Moon Structures Division, School of Architecture, University of Illinois at Urbana-Champaign, Champaign, IL 61820, USA †Corresponding Author: Tel: + 1 217 333 1330; Fax: +1 217 244 2900; E-mail:
[email protected] Received 8 May; accepted 13 June 2007 Abstract: Tall building developments have been rapidly increasing worldwide. This paper reviews the evolution of tall building’s structural systems and the technological driving force behind tall building developments. For the primary structural systems, a new classification – interior structures and exterior structures – is presented. While most representative structural systems for tall buildings are discussed, the emphasis in this review paper is on current trends such as outrigger systems and diagrid structures. Auxiliary damping systems controlling building motion are also discussed. Further, contemporary “out-of-the-box” architectural design trends, such as aerodynamic and twisted forms, which directly or indirectly affect the structural performance of tall buildings, are reviewed. Finally, the future of structural developments in tall buildings is envisioned briefly. Keywords: Aerodynamics, Building forms, Damping systems, Diagrid structures, Exterior structures, Interior structures, Outrigger systems, Structural performance, Structural systems, Tall buildings Introduction Tall buildings emerged in the late nineteenth century in revolution – the steel skeletal structure – as well as consequent the United States of America. They constituted a so-called glass curtain wall systems, which occurred in Chicago, has led to “American Building Type,” meaning that most important tall the present state-of-the-art skyscraper.