502G.3 Concrete Building Website.
San Francisco Building Inspection Commission Codes · 2022 edition · ingested 2026-07-08 · San Francisco
502G.3 Concrete Building Website. The Department shall maintain a webpage providing information about the screening process, the status of subject buildings, and links to the seismic retrofit provisions of Appendix A, which owners may voluntary choose to implement to have the building removed from the CB and RWFD inventory.
(Added by Ord. 70-25, File No. 250211, App. 5/9/2025, Eff. 6/9/2025)
Cha ters 6 to Cha ter 15 p p
[ ← ] These chapters are not adopted in San Francisco.
Chapter 16 REFERENCED STANDARDS
No San Francisco Existing Building Code Amendments.
Add the following appendices:
CALIFORNIA EXISTING BUILDING CODE (CEBC) APPENDICES (CEBC) APPENDIX A CHAPTER A1 SEISMIC STRENGTHENING PROVISIONS FOR UNREINFORCED MASONRY BEARING WALL BUILDINGS
No San Francisco Existing Building Code Amendments
(CEBC) APPENDIX A CHAPTER A2 EARTHQUAKE HAZARD REDUCTION IN EXISTING REINFORCED CONCRETE AND REINFORCED MASONRY WALL BUILDINGS WITH FLEXIBLE DIAPHRAMS [1]
No San Francisco Existing Building Code Amendments
(CEBC) APPENDIX A CHAPTER A3 PRESCRIPTIVE PROVISIONS FOR SEISMIC STRENGTHENING OF CRIPPLE WALLS AND SILL PLATE ANCHORAGE OF LIGHT, WOOD-FRAME RESIDENTIAL BUILDINGS
No San Francisco Existing Building Code Amendments
(CEBC) APPENDIX A CHAPTER A4 EARTHQUAKE RISK REDUCTION IN WOOD-FRAME RESIDENTIAL BUILDINGS WITH SOFT WEAK OR OPEN FRONT WALLS ,
No San Francisco Existing Building Code Amendments
(CEBC) APPENDIX A CHAPTER A5 REFERENCED STANDARDS
No San Francisco Existing Building Code Amendments
[APPENDIX A CHAPTER A6 SEISMIC RETROFIT PROVISIONS FOR CONCRETE BUILDINGS] [1]
CODIFICATION NOTE
- Ord. 70-25 did not mark the Chapter A6 heading for addition. The heading has been included here for reference, with square brackets indicating that it is unofficial.
A6.1 Intent. This Chapter A6 establishes seismic retrofit provisions intended to reduce the collapse risk of the most vulnerable Concrete Buildings (CB), as defined in Chapter 5G.
(Added by Ord. 70-25, File No. 250211, App. 5/9/2025, Eff. 6/9/2025)
A6.2 Definitions
In addition to the definitions in San Francisco Building Code Chapter 2 and San Francisco Existing Building Code Chapter 2, the following shall apply for purposes of this Chapter A6:
Wall pier. A vertical wall segment within a structural wall, bounded horizontally by two openings or by an opening and an edge, with ratio of horizontal length to wall thickness less than or equal to 6.0, and ratio of clear height to horizontal length greater than 2.0.
(Added by Ord. 70-25, File No. 250211, App. 5/9/2025, Eff. 6/9/2025)
A6.3 Design Professionals. All evaluations and design intended to comply with this Chapter shall be performed by or under the supervision of appropriately licensed individuals, and all documents submitted for compliance shall be sealed by a California licensed civil or structural engineer.
(Added by Ord. 70-25, File No. 250211, App. 5/9/2025, Eff. 6/9/2025)
A6.4 Structural engineering criteria
A6.4.1 Engineering criteria. For a Concrete Building to comply with this Chapter, the building shall satisfy one of the Engineering Criteria Options per Table A6.4-1, by seismic evaluation or seismic retrofit.
Table A6.4-1: Engineering Criteria Options
| Option (a) |
Comply with all of the following: |
|---|---|
| Option (a) |
1. ASCE 41 with a performance objective of Structural Collapse Prevention (S-5) with the BSE-1E earthquake hazard level. |
| Option (a) |
2. For each seismic deficiency in Table A6.4-2, demonstrate that the deficiency is not present, or address it by retrofitting. In a bulletin, the Department shall specify requirements for identifying, evaluating, and retrofitting the seismic deficiencies listed in Table A6.4-2. |
| Option (a) |
3. For all unreinforced masonry elements, ASCE 41 with a performance objective of Nonstructural Life Safety (N C) with the BSE-1E earthquake hazard level. |
| Option (b) |
Comply with all of the following: |
| Option (b) |
1. ASCE 41 with a performance objective of Structural Collapse Prevention (S-5) with the BSE-2E earthquake hazard level. The BSE-1E earthquake hazard level need not be evaluated, regardless of the Tier of evaluation. |
| Option (b) |
2. For all unreinforced masonry elements, ASCE 41 with a performance objective of Nonstructural Life Safety (N C) with the BSE-1E earthquake hazard level. |
Table A6.4-2: Seismic deficiencies to be addressed by Engineering Criteria Option (a)
A6.4.2 Building separation. The building separation limitations of Section 7.2.13 of ASCE 41 need not be considered.
A6.4.3 Liquefaction or landslide risk. If the building is located in a zone of high or very high risk of soil liquefaction or landslide, as indicated by the current State of California Seismic Hazard Zones Map for San Francisco, the Owner’s Engineer shall so notify the Owner in writing. Aside from such notification, soil liquefaction, lateral spreading, and landslide are not required to be addressed in the seismic evaluation or retrofit design. This Chapter does not exempt the building from the requirements of the Slope and Seismic Hazard Zone Protection Act (San Francisco Building Code 106A.4.1.4) where applicable.
A6.4.4 Other retrofit triggers. If the project involves a Substantial Structural Alteration as defined in Section 503.11 or Non-structural Alteration as defined in Section 503.11.1, the building shall meet the more restrictive of the provisions of this Chapter or those of Section 304.4 (Minimum lateral force for existing buildings).
A6.4.5 Masonry Infill. For Concrete Buildings with masonry infill, the seismic evaluation and retrofitting shall account for the effect of the infill considering ASCE 41 requirements, and for Tier 2 and Tier 3 evaluations shall take into account:
The peak strength that the infill can achieve.
The potential for strength degradation of the infill.
The potential for a weak story or story concentration of deformation, because of the locations of infill in the building, or because of potential concentrations of damage to infill.
Plan torsion effects because of the location of infill in the building, or because of potential concentrations of damage to infill.
(Added by Ord. 70-25, File No. 250211, App. 5/9/2025, Eff. 6/9/2025)
GREEN BUILDING CODE 2022 Edition
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The San Francisco Green Building Code amendments contained herein were adopted by the Board of Supervisors of the City and County of San Francisco on November 10, 2022, by Ordinance 227-22, effective December 11, 2022, and operative January 1, 2023.
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PREFACE
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