The AISC Load and Resistance Factor Design (LRFD) Specification/or Structural Steel Buildings is intended to cover the common design criteria in routine office practice. Accordingly, it is not feasible to also cover the many special and unique problems encountered within the full range of structural design practice. This AISC Seismic Provisions for Structural Steel Buildings is a separate document that addresses one such topic: the design and construction of structural steel and composite structural steel/reinforced concrete building systems in seismic regions. These Provisions are in three parts: Part I is intended for the design and construction of structural steel buildings; Part II is intended for the design and construction of composite structural steel/reinforced concrete buildings; Part III is an allowable stress design alternative to the LRFD provisions for structural steel buildings in Part I. Additionally, a list of Symbols, a Glossary, and a non-mandatory Commentary with background information are provided. The first letter(s) of words or terms that appear in the glossary are generally capitalized throughout these Provisions.
The AISC Committee on Specification, Task Committee 113-Seismic Provisions is responsible for ongoing development of these Provisions. Additionally, the AISC Committee on Specification has enhanced these Provisions through careful scrutiny, discussion, suggestion for improvements, and endorsement. AISC further acknowledges the various contributions of several groups to the completion of this document: the Building Seismic Safety Council (BSSC), the National Science Foundation (NSF), the SAC Joint Venture, and the Structural Engineers Association of California (SEAOC).
The principal changes in this revision of the Seismic Provisions are: extensive modifications to Special Moment Frames (SMF), the addition of special requirements for welded and bolted connections, an expanded diversity of structural steel systems, such as Intermediate Moment Frames (IMF), Special Truss Moment Frames (STMF), and Special Concentrically Braced Frames (SCBF); the addition of Part II, which covers composite structural steel/reinforced concrete seismic systems; and, the incorporation of Appendix S with provisions for the evaluation of moment connection performance through testing.
