About the author  ⁄ Michael Gannon, S.E., P.E.

Michael Gannon is a Senior Engineer at the American Institute of Steel Construction and Secretary of the AISC Task Committee on Seismic Systems. (gannon@aisc.org)

As the building industry forges ahead with technology and innovation, designers are encouraged to develop structures that perform as never before possible. Particularly in zones of high seismic activity, structures with large open spaces and high ceiling heights may not have seemed practical before the introduction of systems such as multi-tiered braced frames (MTBF). However, specific requirements for designing these MTBF systems are now defined in the Seismic Provisions for Structural Steel Buildings, ANSI/AISC 341-16, referred to as the 2016 AISC Seismic Provisions. This provides support both for these structures and for the seismic design industry.

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