Steel Tips from the Structural Steel Educational Council

Steel TIPS

07.2004 > Seismic Design of Buckling-Restrained Braced Frames

By Walterio A. L█pez and Rafael Sabelli

Seismic Design of Buckling-Restrained Braced Frames

Buckling-Restrained Braced Frames (BRBFs) are a new steel seismic-load-resisting system that has found use in the western United States because of its efficiency and its promise of seismic performance far superior to that of conventional braced frames. The system is not yet addressed in the 2005 edition of the AISC Seismic Provisions for Structural Steel Buildings, but nevertheless a set of design provisions has been developed by AISC in conjunction with the Structural EngineerÝs Association of California. This report illustrates the seismic design of buckling-restrained braced frames; they are defined, and the provisions governing their design and required testing are explained. A summary of selected Buckling-Restrained Brace (BRB) testing performed to date is provided. Compliance with design requirements is explained through detailed component design of two typical BRBF configurations and development of testing protocols. A discussion of gusset-plate design and its influence on acceptable frame behavior is provided.

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