Project Start: October 2011
Project Completion: September 2012
The Council on Tall Building and Urban Habitat’s Outrigger Working Group has addressed the pressing need for design guidelines for outrigger systems with this research. The resulting Technical Guide offers detailed recommendations for analysis of outriggers within the lateral load resisting systems of tall buildings, for recognizing and addressing effects on building behavior and for practical design solutions. It also highlights concerns specific to the outrigger structural system such as differential column shortening and construction sequence impacts.
In 2017, the Council published the 2nd edition of this guide, which includes a new chapter exploring the use of “hybrid” outrigger systems that can “tune” the stiffness of outrigger trusses, use leverage of the outrigger arms to drive non-linear damping devices, and use “yielding” materials that absorb seismic energy.
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