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Seismic Evaluation and Retrofit of Existing Buildings

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Abstract

  • Prepared by the Seismic Evaluation and Retrofit of Existing Buildings Committee of the Codes and Standards Activities Division of the Structural Engineering Institute of ASCE

    Seismic Evaluation and Retrofit of Existing Buildings, Standard ASCE/SEI 41-23, describes deficiency-based and systematic procedures that use performance-based principles to evaluate and retrofit existing buildings to withstand the effects of earthquakes. 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. Checklists are provided for a variety of building types and seismicity levels in support of the Tier 1 screening process.

    ASCE 41-23 is a primary reference for structural engineers addressing the seismic resilience of existing buildings and for building code officials reviewing such work. It also will be of interest to architects, construction managers, academic researchers, and building owners.

    The screening checklists included in Chapter 17 and Appendix C of this standard are also available separately as fillable PDF forms that can be completed using Adobe Acrobat Reader. Go to Tier 1 Checklists for Seismic Evaluation of Existing Buildings: Fillable Forms for Standard ASCE/SEI 41-23.

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Front Matter for Seismic Evaluation and Retrofit of Existing Buildings
i–xlv
    CHAPTER 1 GENERAL REQUIREMENTS
    1–19
    CHAPTER 2 PERFORMANCE OBJECTIVES AND SEISMIC HAZARDS
    21–25
    CHAPTER 3 EVALUATION AND RETROFIT REQUIREMENTS
    27–37
    CHAPTER 4 TIER 1 SCREENING
    39–46
    CHAPTER 5 TIER 2 DEFICIENCY-BASED EVALUATION AND RETROFIT
    47–56
    CHAPTER 6 TIER 3 SYSTEMATIC EVALUATION AND RETROFIT
    57–59
    CHAPTER 7 ANALYSIS PROCEDURES AND ACCEPTANCE CRITERIA
    61–87
    CHAPTER 8 FOUNDATIONS, SUBSURFACE SOIL, AND GEOLOGIC SITE HAZARDS
    89–106
    CHAPTER 9 STEEL AND IRON
    107–117
    CHAPTER 10 CONCRETE
    119–136
    CHAPTER 11 MASONRY
    137–159
    CHAPTER 12 WOOD
    161–176
    CHAPTER 13 ARCHITECTURAL, MECHANICAL, AND ELECTRICAL COMPONENTS
    177–200
    CHAPTER 14 SEISMIC ISOLATION
    201–211
    CHAPTER 15 DESIGN REQUIREMENTS FOR STRUCTURES WITH SUPPLEMENTAL ENERGY DISSIPATION
    213–221
    CHAPTER 16 SYSTEM-SPECIFIC PERFORMANCE PROCEDURES
    223–230
    CHAPTER 17 TIER 1 CHECKLISTS
    231–293
    CHAPTER 18 REFERENCE DOCUMENTS
    295–297
    Appendix A GUIDELINES FOR DEFICIENCY-BASED PROCEDURES
    299–342
    Appendix B APPLYING ASCE 41 IN BUILDING CODES, REGULATORY POLICIES, AND MITIGATION PROGRAMS
    343–349
    Appendix C SUMMARY DATA SHEET
    351–351
    Commentary to Standard ASCE/SEI 41-23
    353–559
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    Index for Seismic Evaluation and Retrofit of Existing Buildings
    561–567
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