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Outrigger systems have been widely used in super tall buildings since the 1980’s, eclipsing the tubular frame systems previously favored. However, the outrigger system is not listed as a seismic lateral load resisting system in any code, and design guidelines are not available. As outrigger systems become more commonplace in tall building design, CTBUH has recognized the need for general guidelines and has thus formed the Outrigger Working Group.
The working group’s primary goal is to develop an outrigger system design guide which provides an overview of outrigger system history, design considerations and recommendations. The design guide will describe in detail the application of outriggers within the lateral load resisting systems of tall buildings, effects on building behavior and recommendations for design. It will also address concerns specific to this structural system such as differential column shortening and construction sequence impacts. Project examples will be presented for various types of outrigger systems. The document will illustrate the impact of outrigger systems on tall building designs, and demonstrates ways in which the technology of such systems is continuously advancing. It is expected that the guideline will be published in 2012.
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