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Seismic Evaluation and Retrofit of Concrete Buildings: A Practical Overview of the <i>ATC 40</i> Document
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The ATC 40 report, a 612‑page guide funded by the California Seismic Safety Commission, outlines recommended procedures for seismic evaluation and retrofit of concrete buildings and includes emerging techniques applicable to many building types. This paper introduces and provides an overview of the ATC 40 document. The guide adopts a performance‑based design approach using nonlinear static analysis, covering performance objectives, seismic hazard assessment, deficiency determination, retrofit strategies, quality assurance, capacity‑spectrum analysis, modeling recommendations, foundation effects, and response limits.
The Applied Technology Council (ATC), with funding from the California Seismic Safety Commission developed the document, Seismic Evaluation and Retrofit of Concrete Buildings, commonly referred to as ATC 40. This two-volume, 612-page report provides a recommended procedure for the seismic evaluation and retrofit of concrete buildings. Although the focus is specifically on concrete buildings, the document provides information on emerging techniques applicable to most building types. This paper provides an introduction and overview of the document. The conceptual basis of the procedures is performance-based design using nonlinear static structural analysis. The ATC 40 document comprises a practical guide to the entire evaluation and retrofit process. Topics include performance objectives, seismic hazard, determination of deficiencies, retrofit strategies, quality assurance procedures, nonlinear static analysis using the capacity spectrum method, modeling recommendations, foundation effects, and response limits.