Abstract

Prepared by the Seismic Retrofit of Existing Buildings Standards 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 41-17, 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. This new edition, which updates and replaces previous editions of ASCE 41, introduces revisions to the basic performance objectives for existing buildings and to the evaluation of force-controlled actions. It revises the nonlinear dynamic procedure and changes provisions for steel and concrete columns, as well provisions as for unreinforced masonry.

Standard ASCE/SEI 41-17 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.

Abstract

Sponsored by the Structural Engineering Institute of ASCE

In Seismic Evaluation and Retrofit of Existing Buildings, Standard ASCE/SEI 41-13, a three-tiered process is established for seismic evaluation according to a range of building performance levels. Tier 1 evaluation focuses on identifying potential deficiencies in existing buildings based on the performance of similar buildings in past earthquakes. The systematic procedure sets forth a methodology to evaluate the entire building in a rigorous manner.

Tier 1 Checklists for Seismic Evaluation of Existing Buildings: Fillable Forms for Standard ASCE/SEI 41-13 is a complete collection of the screening checklists included in Appendix C of Standard 41-13. The evaluation checklists, covering a variety of building types and seismicity levels, are now offered as fillable PDF forms that can be completed using Adobe Acrobat Reader. The collection of 34 forms includes the summary data sheet, Life Safety and Immediate Occupancy checklists for basic configuration and 15 building types, and a nonstructural checklist. Each form contains criteria for four seismicity levels: very low, low, moderate, and high.

The fillable PDF forms are designed for use with Adobe Acrobat Reader, version 9.0 or later, which is available here as a free download. The forms can be used, saved, and printed as often as necessary. They are designed to work on Microsoft Windows and Apple Mac OS platforms (not recommended for tablets or smart phones). This product is supplied under a license that covers workstations utilized in one corporate office only; multiple corporate office locations require the purchase of additional licenses. For inquiries, please contact ascelibrary@asce.org.

A sample form is available for free download here.

Note to purchasers: The forms are bundled in a single .ZIP file that is accessible as Supplemental Material. To download, click on "Supplemental Material" and then click on "Download Checklists."

Abstract

Sponsored by the Structural Engineering Institute of ASCE

Seismic Evaluation and Retrofit of Existing Buildings describes deficiency-based and systematic procedures that use performance-based principles to evaluate and retrofit existing buildings to withstand the effects of earthquakes. This next-generation standard combines the evaluation and retrofit process and puts forth a three-tiered process for seismic evaluation according to a range of building performance levels—from collapse prevention to operational—that marry targeted structural performance with the performance of nonstructural elements. The deficiency-based procedures allow the evaluation and retrofit effort to focus on specific potential deficiencies deemed, on the basis of past earthquake observations, to be of concern for a permissible 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.

Analysis procedures and acceptance criteria are established and requirements put forth 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. In addition, screening checklists are provided for a variety of building types and seismicity levels in support of the Tier 1 process.

This standard updates and replaces the previous Standard ASCE/SEI 41-06, Seismic Rehabilitation of Existing Buildings, as well as Standard ASCE/SEI 31-03, Seismic Evaluation of Existing Buildings.

Standard ASCE/SEI 41-13 serves structural engineers, design professionals, code officials, and building owners interested in improving the seismic performance of existing buildings.

The screening checklists included in 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 41-13.

Abstract

Seismic Rehabilitation of Existing Buildings presents the latest generation of performance-based seismic rehabilitation methodology. This new national consensus standard was developed from the FEMA 356, Prestandard and Commentary for the Seismic Rehabilitation of Buildings. This Standard represents state-of-the-art knowledge in earthquake engineering and is a valuable tool for the structural engineering profession to improve building performance in future earthquakes. 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 440; 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.

ASCE/SEI Standard 41-06 is a valuable tool for structural engineers and the public for improving seismic performance of existing buildings.

Abstract

Seismic Evaluation of Existing Buildings provides a three-tiered process for seismic evaluation of existing buildings to either the Life Safety or Immediate Occupancy Performance Level. Design professionals will learn how to determine whether a building is adequately designed and constructed to resist seismic forces. All aspects of building performance are considered and defined in terms of structural, nonstructural, and foundation/geologic hazard issues. The design of mitigation measures is not addressed in this Standard.

ASCE/SEI 31-03 is intended to replace FEMA 310, Handbook for Seismic Evaluation of Buildings—A Prestandard (1998). This Standard was written to: reflect advancements in technology; incorporate the experience of design professionals; incorporate lessons learned during recent earthquakes; be compatible with FEMA 356, Prestandard and Commentary for the Seismic Rehabilitation of Buildings (2000); be suitable for adoption in building codes and contracts; be nationally applicable; and provide evaluation techniques.

This Standard serves design professionals, code officials, and building owners looking to evaluate the seismic existing buildings.