Chapter 13.40 — MANDATORY SEISMIC STRENGTHENING PROVISIONS FOR PRENORTHRIDGE STEEL…

The provisions of this chapter are intended to promote the public welfare and safety by reducing the risk of death or injury that may result from the effects of earthquakes on existing preNorthridge steel moment frame buildings. The poor performance of these buildings is well documented and typically attributed to deficiencies in the lateral-force-resisting system beamcolumn connections that render the building incapable of performing as intended when subject to large earthquake ground motions. This chapter creates minimum standards intended to improve the performance of these buildings during earthquakes and reduce, but not necessarily prevent, the loss of life, injury or earthquake-related damage. (Ord. 17-1011 § 2, 2017)

The provisions of this chapter shall apply to any building utilizing steel moment frames that are determined by the Building Official to have been built under building code standards enacted before December 1995.

This chapter shall not apply to the following structure types:

1. Unreinforced masonry buildings previously strengthened with steel moment frames.

2. Residential wood-framed buildings utilizing steel moment frames.

3. Residential common interest developments as that term is defined in the West Hollywood Municipal Code Section 19.90.020.

Notwithstanding any provision of the Building Code, compliance with this chapter shall not require existing electrical, plumbing, mechanical or fire-safety systems to be altered to comply with the current Building Code unless they constitute a hazard to life or property as determined by the Building Official.

(Ord. 17-1011 § 2, 2017)

Notwithstanding the applicable definitions, symbols and notations in the Building Code, the following definitions shall apply for the purposes of this chapter:

"Building Code" is the current Building Code of the City of West Hollywood.

"Historical Building" is any building designated as a "qualified historical building" as defined in Part 8, Title 24 of the California Code of Regulations.

"Load Path Deficiency" occurs when the structure does not contain a complete, well defined load path, including structural elements and connections, that serves to transfer the inertial forces associated with the mass of all elements of the building to the foundation.

"Owner or Building Owner" is the individual(s), agent, firm, corporation, or entity having legal possession, equitable interest in the property, or rights to sanction evaluation or retrofit of a

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City of West Hollywood, CA

BUILDINGS AND CONSTRUCTION

§ 13.40.030

§ 13.40.050

building.

"Retrofit" is an improvement of the lateral force resisting system by alteration of existing structural elements or addition of new structural elements.

"Soft Story Deficiency" occurs when the stiffness of the seismic-force-resisting system in any story is less than seventy percent of the seismic-force-resisting system in an adjacent story above or less than eighty percent of the average seismic-force system stiffness of the three stories above.

"Steel Moment Frame" is a frame capable of resisting horizontal forces caused by the steel members (beams and column) and joints resisting forces primarily by flexure.

"Story" is as defined in the Building Code, but includes any basement or underfloor space of a building with cripple walls exceeding four feet in height.

"Torsion Deficiency" occurs when the estimated distance between the story center of mass and the story center of rigidity is more than twenty percent of the building width in either plan dimension.

"Vertical Irregularities Deficiency" occurs when all vertical elements in the seismic-forceresisting system are not continuous to the foundation.

"Weak Story Deficiency" occurs when the sum of the shear strengths of the seismic-forceresisting system in any story in each direction is less than eighty percent of the strength in the adjacent story above.

(Ord. 17-1011 § 2, 2017)

The owner of each building within the scope of this chapter shall cause an investigation of the existing construction and a structural analysis to be performed on the building by a registered civil or structural engineer licensed in the State of California and if the building does not meet the minimum standards specified in this chapter, the owner shall cause it to be structurally altered to conform to such standards.

Each building within the scope of this chapter, which has been analyzed to demonstrate compliance or has been structurally altered to comply with the minimum earthquake standards in this chapter, shall be maintained in conformity with the requirements of this chapter in effect at the time of such analysis or structural alteration.

Notwithstanding any other provisions of this code to the contrary, a building that is found to be within the scope of this chapter and is not brought into compliance with this chapter in the time frame indicated in Section 13.40.050 Table A, shall be declared unsafe and subject to the requirements of Section 102 of the California Building Code. (Ord. 17-1011 § 2, 2017)

• a. Retrofit Phases. The owner of any building subject to the provisions of this chapter shall meet the requirements as specified in the following two phases:

Phase 1: Engineering Report and Major Deficiency Mitigation. The owner shall submit an engineering report to the Building and Safety Division demonstrating whether the structure conforms to the design provisions contained in this chapter and identify all

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City of West Hollywood, CA § 13.40.050

WEST HOLLYWOOD CODE

§ 13.40.050

structural deficiencies in accordance with ASCE 41. Minimum report requirements shall be as specified by the Building Official. Buildings identified to have any of the major deficiencies listed below shall be required to retrofit the building in such a way to mitigate the identified major deficiency within the time limits allowed in Table A. Alternatively, the engineering report may show that the major deficiencies meet the requirements of ASCE 41 through advanced analysis.

Major Deficiencies:

1. Load path.

2. Weak or soft story.

3. Vertical irregularity.

4. Torsion.

Alterations made to the structure to mitigate the major deficiencies listed above shall not impact existing lateral load elements by increasing any demand-to-capacity ratio by more than ten percent unless the existing elements are shown to be capable of resisting the increased demand. In addition, the mitigation of the major deficiencies shall not create addition structural deficiencies or make the existing structural deficiencies more severe.

Phase 2: Complete Retrofit. The owner shall complete the retrofit of the structure to meet the requirements specified in Section 13.40.090 and mitigate all remaining structural deficiencies within the time limits allowed in Table A.

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TABLE A
TIME PERIOD FOR COMPLIANCE
Phase 1: Engineering Report & Major Deficiency
Mitigationa, b Phase 2: Complete Retrofitd
Phase Submit Submit Obtain Complete Submit Obtain Complete
Engineering Retrofit Building Major Retrofit Building Construction
Report & Plans for Permit & Deficiency Plans Permit &
Determine Major Commence Mitigation Commence
All Structural Deficiency Construction Constructionc Construction
Deficiencies Mitigation
Milestone 3 Years from 5 Years from 7 Years from 10 Years 13 Years 15 Years 20 Years
Notice to the Notice to the Notice to the from Notice from Notice from Notice from Notice
Owner Owner Owner to the Owner to the Owner to the Owner to the Owner
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Notes:

• a. All buildings within the scope of this chapter are required to submit an engineering report and determine all structural deficiencies. Buildings that do not contain any of the major deficiencies as defined in this chapter are not required to submit retrofit plans for major deficiency mitigation, commence construction, and complete construction in Phase 1, but shall provide retrofit plans and complete construction within the time limits provided in Phase 2.

• b. Phase 1 retrofit plans must indicate preliminary Phase 2 retrofit extents. Minimum Phase 2 scoping requirements shall be as specified by the Building Official.

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City of West Hollywood, CA

BUILDINGS AND CONSTRUCTION

§ 13.40.050

§ 13.40.060

Notes:

• c. Completion of Phase 1 may be extended by three years if retrofit plans in accordance with the scope of Phase 2 are designed, approved, permitted and constructed within Phase 1.

• d. The Building Code version governing Phase 1 shall be permitted to be utilized in Phase 2.

• b. Priority Designations. The Building Official shall prioritize its enforcement of this chapter as defined in Table B.

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TABLE B
PRIORITY DESIGNATION
Priority Description
Priority I. Buildings with 8 or more stories
Priority II. Buildings with 3 to 7 stories
Priority III. Buildings with 2 or less Stories
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• (Ord. 17-1011 § 2, 2017)

• a. Issuance of Order. The Building Official shall, in accordance with the priorities set forth in Section 13.40.050 Table B, issue an order as provided in this section to the owner of each building that is expected to be within the scope of this chapter.

• b. Contents of Order. The order shall be in writing and shall be served either personally or by certified or registered mail to the owner as shown on the last equalized Los Angeles County assessment roll of the building. The order shall specify that the building has been determined by the Building Official to be within the scope of this chapter and, therefore, is required to meet the standards of this chapter.

• c. Service of Order. Proper service of a notice shall be by registered or certified mail. It shall be deemed a reasonable effort has been made to serve such notice when registered or certified letters have been mailed to the address of the interested party as shown on the official record. The designated period within which the owner or person in charge is required to comply with such notice shall begin as of the date the owner or person in charge receives such notice by personal service or certified mail.

• d. Failure to Receive Order. Failure of any owner, party concerned or other person to receive such notice shall not affect the validity of any proceedings taken thereunder.

• e. Appeal from Order. The owner of the building may appeal the Building Official's initial determination that the building is within the scope of this chapter to the Building Board of Appeals established by Section 105 of the Building Code. Such appeal shall be filed with the Board within sixty days from the service date of the order described in subsection (c). Any such appeal shall be decided by the Board no later than ninety days after the date that the appeal is filed. Such appeal shall be made in writing and the grounds thereof shall be stated clearly and concisely. Appeals or requests for modifications from any other determinations, orders or actions by the Building Official pursuant to this chapter shall be made in accordance with the procedures established in Sections 104.2.7 and 105 of the

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City of West Hollywood, CA § 13.40.060

WEST HOLLYWOOD CODE

§ 13.40.090

Building Code.

• f. Extensions. The building owner may request an extension to the time period for compliance set forth in Table A of Section 13.40.050. An application for extension may only be filed after the owner has submitted an engineering report to the city with a determination of all deficiencies and the retrofit plans for major deficiency mitigation have been approved by the city. The building owner has the burden of proof to establish with substantial evidence that good cause for the extension exists. The building owner must also provide a new proposed schedule for compliance, and plan to comply with the provisions of this chapter during that timeframe. Upon good cause shown, the Building Official may approve, approve with modifications or deny the extension request for an extension that is commensurate with the justification for the extension. The owner of the building may appeal the Building Official's decision on the extension to the Building Board of Appeals established by Section 105 of the Building Code. Such appeal shall be filed with the Board within twenty days from the date of the decision. Any such appeal shall be decided by the Board no later than ninety days after the date that the appeal is filed. Such appeal shall be made in writing and the grounds thereof shall be stated clearly and concisely. Appeals shall be made in accordance with the procedures established in Section 105 of the Building Code. The Board's decision on the appeal shall be final.

• g. The Building Official may promulgate implementing regulations and policies consistent with this chapter.

• (Ord. 17-1011 § 2, 2017)

• a. Notification to Tenants and Occupants. The owner shall advise all current and prospective residential and nonresidential tenants, subtenants, lessees, sublessees, or any other person(s) entitled to the use and/or occupancy of the building of a proposed project submitted pursuant to this chapter. The notice shall include the information for the project, as determined by the city, including the scope of work, expected duration, and contact information for a representative of the contractor.

• b. Tenant Protection During Construction. No work shall commence until the property owner has complied with the requirements of Chapter 17.30 of Title 17 of this code.

• (Ord. 17-1011 § 2, 2017; Ord. 18-1047 § 5, 2018)

Historical buildings shall also comply with the provisions of this chapter. At the Building Official's discretion, modifications to the standards set forth in this chapter may be permitted when such modifications are consistent with the provisions of the California Historical Building Code.

(Ord. 17-1011 § 2, 2017)

• a. Scope of Analysis. This chapter requires the evaluation, alteration, repair, replacement or addition of structural elements and their connections to meet the following requirements in this section.

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City of West Hollywood, CA

BUILDINGS AND CONSTRUCTION

§ 13.40.090

§ 13.40.100

• b. Building Structural Analysis, Design and Evaluation. The building shall meet or exceed the structural performance level for the associated earthquake hazard levels as indicated in Table C based on the risk category as defined in ASCE 41:

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TABLE C:
SEISMIC PERFORMANCE REQUIREMENTS BY RISK CATEGORY
Risk Category Hazard Level 1 Hazard Level 2
I & II BSE-1E, S-3 BSE-2E, S-5
III & IV BSE-1E, S-2 BSE-2E, S-5
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• c. Material Testing and Condition Assessment. The engineer shall conduct material testing and condition assessment on the existing structure as specified by the Building Official.

• d. Alternate Analysis, Base Shear and Design Parameters. The Building Official may approve alternate design methodologies that meet the same performance intent as those prescribed by this chapter and that achieve the objectives established by this chapter. A design criteria shall be submitted to the city for review and approval prior to submission of plans.

(Ord. 17-1011 § 2, 2017)

• a. General. The plans and specifications required by the Building Official shall be of sufficient clarity to indicate the nature, design methodology, and extent of the proposed work and to show in detail that it will conform to the provisions of this chapter and the Building Code.

• b. Phase 1 Engineer's Statement. Where engineering plans are required, the responsible engineer shall provide the following statements on the approved plans:

"I am responsible for designing this building's Phase 1 seismic strengthening in compliance with the minimum standards of the Mandatory Seismic Strengthening Provisions For PreNorthridge Steel Moment Frame Buildings (Chapter 13.40)."

• c. Phase 2 Engineer's Statement. The responsible engineer shall provide the following statements on the approved plans:

"I am responsible for designing this building's Phase 2 seismic strengthening in compliance with the minimum standards of the Mandatory Seismic Strengthening Provisions For PreNorthridge Steel Moment Frame Buildings (Chapter 13.40)."

• d. Phase 1 Owner or Owner's Representative Statement. The owner shall provide and sign the following statement on the cover of the drawings:

"I ____________ understand the seismic evaluation and strengthening performed under this project is limited to a deficiency only mitigation under the Phase 1 requirements of the Mandatory Seismic Strengthening Provisions For Pre-Northridge Steel Moment Frame Buildings (Chapter 13.40) which is intended to limit the risk under a seismic event. I understand the full building has not been strengthened for other potential structural deficiencies that may cause a life safety concern, injury or property damage risk under a

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City of West Hollywood, CA § 13.40.100

WEST HOLLYWOOD CODE

§ 13.40.120

seismic event."

• e. Phase 2 Owner or Owner's Representative Statement. The owner shall provide and sign the following statement on the cover of the drawings:

"I ____________ understand the seismic evaluation and strengthening performed under this project is in conformance with the Mandatory Seismic Strengthening Provisions For PreNorthridge Steel Moment Frame Buildings (Chapter 13.40) which is intended to reduce the risk under a seismic event."

• f. Quality Control and Assurance Requirements. General notes shall show the requirements for material testing, special inspection, structural observation and the proper installation of newly added materials.

• (Ord. 17-1011 § 2, 2017)

• a. Structural Observation. All structures regulated by this chapter require structural observation during construction. The owner shall employ the engineer of record responsible for the structural design, or another registered engineer designated by the engineer of record to perform structural observation as defined in the Building Code.

• b. Special Inspection. Special inspections shall be provided as required by the Building Code. Additional inspections shall be noted on drawings as required by Building Official.

• (Ord. 17-1011 § 2, 2017)

• a. Violation. It shall be unlawful for any person to own, use, occupy or maintain any building or structure or portion thereof, or cause the same to be done, contrary to, or in violation of, any of the provisions of this chapter.

• b. Penalty. Any person, firm or corporation violating any of the provisions of this chapter shall be guilty of the misdemeanor, and each such person shall be guilty of a separate offense for each and every day or portion thereof during which any violation of any of the provisions of this chapter is committed, continued or permitted, and upon conviction of any such violation such person shall be punishable by a fine of not more than $1,000 or by imprisonment for not more than six months, or by both such fine and imprisonment. The provisions of this section are in addition to and independent of any other sanctions, penalties or costs which are or may be imposed for a violation of any of the provisions of this chapter.

• c. Recordation of Violation.

  1. General. The Building Official may record a notice with the County Recorder's office that a property, building or structure, or any part thereof, is in violation of any provision of this chapter provided that the provisions of this section are complied with. The remedy provided by this section is cumulative to any other enforcement actions permitted by this chapter.

  2. Recordation. If: (A) the Building Official determines that any property, building, or structure, or any part thereof is in violation of any provision of this chapter; and if (B)

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City of West Hollywood, CA

BUILDINGS AND CONSTRUCTION

§ 13.40.120

§ 13.40.140

the Building Official gives written notice as specified below of said violation; then the Building Official may have sole discretion to, at any time thereafter, record with the County Recorder's office a notice that the property and/or any building or structure located thereon is in violation of this chapter.

• Notice. The written notice given pursuant to this section shall indicate:

• A. The nature of the violation(s); and

• B. That if the violation is not remedied to the satisfaction of the Building Official, the Building Official may, at any time thereafter, record with the County Recorder's office a notice that the property and/or any building or structure located thereon is in violation of this chapter. The notice shall be posted on the property and shall be mailed to the owner of the property as indicated on the last equalized county assessment roll. The mailed notice may be by registered, certified, or first-class mail.

4. Rescission. Any person who desires to have recorded a notice rescinding the notice of violation must first obtain the necessary approvals and permit(s) to correct the violation. Once the Building Official determines that the work covered by such permit(s) has been satisfactorily completed, the Building Official may record a notice rescinding the prior notice of violation.

Following the recordation of the notice of violation the Building Official is not required to make any inspection of review of the premises to determine the continued existence of the cited violation. It is the responsibility of the property owner, occupant or other similarly interested private party to comply with the above provisions.

• d. Costs. Any person that has violated any provision of this chapter shall be responsible for the costs of any and all code enforcement actions taken by the Building Official in response to such violations. These costs shall be based on the amounts specified by the current fee schedule.

• (Ord. 17-1011 § 2, 2017)

• a. Internal Conflict. Where there is a conflict between a general requirement and a specific requirement, the specific requirement shall be applicable. Where, in any specific case, different sections of this chapter specify different materials, methods of construction, or other requirements, the most restrictive shall govern.

• b. Other Laws. The provisions of this chapter shall not be deemed to nullify any provisions of local, state or federal law.

• c. Codes and References. The provisions of the codes and standards referenced in this chapter shall be considered part of the requirements of this chapter to the prescribed extent of each such reference. Where there are conflicts between provisions of this chapter and the provisions of any referenced code or standard, the provisions of this chapter shall apply.

• (Ord. 17-1011 § 2, 2017)

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City of West Hollywood, CA § 13.44.010

BUILDINGS AND CONSTRUCTION

§ 13.44.030