scope:

The Seismic Provisions for Evaluation and Retrofit of Existing Structural Steel Buildings (ANSI/AISC 342), hereafter referred to as these Provisions, shall govern the seismic evaluation and retrofit of structural steel, composite steel-concrete, wrought iron, and cast iron components of existing buildings subjected to seismic forces and deformations. The requirements of these Provisions shall apply to existing components of a building system, retrofitted components of a building system, and new components added to an existing building system.

ASCE Seismic Evaluation and Retrofit of Existing Buildings, hereafter referred to as ASCE/SEI 41, shall be used to compute the force and deformation demands on all primary and secondary structural steel, composite, wrought iron, and cast iron components.

Existing and new components shall be evaluated in accordance with the requirements in these Provisions. Where required by ASCE/SEI 41, these Provisions are intended to be used in conjunction with the AISC Seismic Provisions for Structural Steel Buildings (ANSI/AISC 341), hereafter referred to as the Seismic Provisions. The strength of existing and new components shall be determined by considering the applicable provisions of Chapters B through K of the AISC Specification for Structural Steel Buildings (ANSI/AISC 360), hereafter referred to as the Specification.

These Provisions include the Symbols, the Glossary, Abbreviations, and Chapters A through I. The Commentary to these Provisions and the User Notes interspersed throughout are not part of these Provisions. The phrases "is permitted" and "are permitted" in this document identify provisions that comply with these Provisions, but are not mandatory.

User Note: The Specification sets forth the overarching procedures to determine the strength of structural steel members and their connections, which are collectively called components in these Provisions. There are specific instances in these Provisions where an alternate formulation for strength is specified. In such cases, the alternate provides for lower strength than would be obtained from the Specification for the specific action or condition being referenced.