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[SEAOC] LA City Earthquake Hazard Reduction Ordinances[Subject Prev][Subject Next][Thread Prev][Thread Next]
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- Subject: [SEAOC] LA City Earthquake Hazard Reduction Ordinances
- From: David Schnitger <DSCHNITG(--nospam--at)BAS.CI.LA.CA.US>
- Date: Tue, 24 Sep 1996 17:00:36 -0700
Three new ordinances have just been adopted by the City of Los Angeles which may be of interest to SEAOC list subscribers. Each of these ordinances is intended to reduce earthquake hazards for certain types of buildings in LA City by encouraging voluntary compliance to minimum standards for certain structural systems. Ord. # 171258 adds Division 94 to the LA building code, entitled VOLUNTARY EARTHQUAKE HAZARD REDUCTION IN EXISTING HILLSIDE BUILDINGS. It provides voluntary retrofit standards under which existing hillside buildings shall be permitted to be structurally analyzed and retrofitted. It applies to buildings which were designed under building codes prior to 6/19/95 and constructed on or into slopes in excess of three horizontal to one vertical. Ord. #171259 adds Division 92 to the LA building code, entitled VOLUNTARY EARTHQUAKE HAZARD REDUCTION IN EXISTING WOOD FRAME RESIDENTIAL BUILDINGS WITH WEAK CRIPPLE WALLS AND UNBOLTED SILL PLATES. It sets proscriptive standards for strengthening underfloor enclosures. This ordinance also provides a design standard for the use of alternate materials or an alternate method of construction in lieu of the proscriptive standards, provided the alternate materials and methods are prepared by an architect or engineer. It applies to light wood frame Group R, Division 3 and Division 1 occupancies with no more than four dwelling units when they contain one or more of the structural weaknesses described in the ordinance. Ord #171260 adds a new Division 95 to the LA building code, entitled VOLUNTARY EARTHQUAKE HAZARD REDUCTION IN EXISTING REINFORCED CONCRETE BUILDINGS AND CONCRETE FRAME BUILDINGS WITH MASONRY INFILLS. The provisions of this ordinance may be applied to all buildings in LA City which were designed under building codes in effect prior to January 13, 1976, or built with building permits issued prior to 1/13/77, having concrete floors and/or concrete roofs supported by reinforced concrete walls or concrete frames and columns, and/or concrete frames with masonry infills. Each of these ordinances was developed as voluntary earthquake reduction retrofit standards to reduce the damage and loss of life to the infrastructure within Los Angeles City and to encourage individual owners to strengthen their existing buildings against seismic forces, where both of the current California Building Code and the Uniform Building Code do not have such standards. These ordinances are intended to provide a minimum life-safety performance level and cost-effective design for particular classes of buildings. Prior to their enactment, the LA City codes did not have a method to strengthen existing older buildings to resist earthquakes, except for the mandatory provisions of Division 88 (pre-1934 Unreinforced Masonry Buildings) and Division 91 (pre-1976 Concrete Tilt-up Buildings). Each of these ordinances was approved on 8/27/96. Copies of each ordinance may be purchased from the Los Angeles City Clerk for $1.00 per document plus $0.10 per page. The City Clerk will accept telephone requests for single copies of the ordinance(s), and will then mail a copy with an invoice for payment. Their telephone number is (213) 485-5705. The City Clerk's office hours are 8:00 am - 5:00 pm M-F. Copies may also be obtained by visiting the City Clerk's public counter in Los Angeles City Hall, 200 N. Spring St, Room 395, Los Angeles, Ca. 90012. David Schnitger ...
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