The standard presents a three-tiered process for seismic evaluation according to a range of building performance levels by connecting targeted structural performance and the performance of nonstructural components with seismic hazard levels. The deficiency-based procedures allow evaluation and retrofit efforts to focus on specific potential deficiencies deemed to be of concern for a specified set of building types and heights. The systematic procedure, applicable to any building, sets forth a methodology to evaluate the entire building in a rigorous manner. This standard establishes analysis procedures and acceptance criteria, and specifies requirements for foundations and geologic site hazards; components made of steel, concrete, masonry, wood, and cold-formed steel; architectural, mechanical, and electrical components and systems; and seismic isolation and energy dissipation systems.
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This new national consensus standard was developed from the FEMA , Prestandard and Commentary for the Seismic Rehabilitation of Buildings, which served as a starting point for the formal standard development process. It includes significant improvements in current understanding of building behavior in earthquakes, such as Improved C-coefficients for calculation of the pseudo-lateral force and target displacement based on recommendations in FEMA ; Comprehensive soil-structure interaction provisions including kinematic effects and foundation damping effects; Revised acceptance criteria for steel moment frames to reflect final conclusions of the SAC Joint Venture research; Expanded acceptance criteria for concentrically braced frames defined as a function of brace slenderness, compactness and level of connection detailing; and Updated nonstructural provisions to be consistent with current NEHRP Provisions for new buildings. The completion of the new Standard represents a considerable advancement for the engineering community.