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(Amended by Ord. No. 182,850, Eff. 1/3/14.)
91.2204.1. Welding. The details of design, work quality and technique for welding, inspection of welding and qualification of welding operators shall conform to the requirements listed in CBC Sections 2205, 2206, 2207, 2208, 2209, 2210 and 2211. Special inspection of welding shall be provided where required by CBC Section 1705. (Amended by Ord. No. 184,692, Eff. 12/30/16.)
All welding, except when performed at the shop of an approved fabricator, shall be done by operators certified by the Department for the type of operation involved in accordance with the provisions of CBC Section 1705.2.2.1.
Complete details of location, type, size and amount of all welds shall be clearly shown on the plans. Where symbols are used on the plans, they shall be the "Standard Welding Symbols," AWS A 2.4, of the American Welding Society (AWS). When it is necessary to use a special erection sequence of welding to minimize locked-up stresses or distortion, the Department may require the erection sequence of welding to be shown on the plans.
Welding procedures are qualified if they are in accordance with the AWS. Other welding procedures require special qualification approval by the Department. Each application for a special qualification shall be accompanied by a fee of $50.00.
Section F2.5b(4) - The use of rectangular HSS are not permitted for bracing members, unless filled solid with cement grout having a minimum compressive strength of 3000 psi (20.7 MPa) at 28 days. The effects of composite action in the filled composite brace shall be considered in the sectional properties of the system where it results in the more severe loading condition or detailing.
(Division Amended by Ord. No. 179,324, Eff. 12/10/07, Oper. 1/1/08.)
Section
91.2300 Basic Provisions.
91.2301 General.
91.2304 General Construction Requirements.
91.2305 General Design Requirements for Lateral Force-Resisting System.
91.2306 Allowable Stress Design.
91.2308 Conventional Light-Frame Construction.
(Amended by Ord. No. 185,587, Eff. 7/16/18.)
Section 2301 of the CBC is adopted by reference, except Section 2301.1 of the CBC is not adopted; and, in lieu, LAMC Subsection 91.2301.1 is added.
Hillside buildings (buildings constructed upon slopes steeper than one unit vertical in three units horizontal [33.3% slope]) shall comply with LAMC Subsection 91.1613.9 (seismic design provisions for hillside buildings) and this division.
(Amended by Ord. No. 187,719, Eff. 1/23/23.)
Section 2304 of the CBC is adopted by reference, except Section 2304.10.2 and 2304.12.2.8 of the CBC are not adopted; and, in lieu, LAMC Subsections 91.2304.10.2 and 91.2304.12.2.8 are added.
91.2304.10.2. Fastener Requirements. Connections for wood members shall be designed in accordance with the appropriate methodology in CBC Section 2302.1. The number and size of fasteners connecting wood members shall not be less than that set forth in Table 2304.10.2. Staple fasteners in Table 2304.10.2 shall not be used to resist or transfer seismic forces in structure assigned to Seismic Design Category D, E, or F.
EXCEPTION: Staples may be used to resist or transfer seismic forces when the allowable shear values are substantiated by cyclic testing and approved by the Superintendent of Building.
91.2304.12.2.8. Wood Used In Retaining Walls and Cribs. Wood installed in retaining or crib walls shall be preservative treated in accordance with AWPA U1 (Commodity Specifications A or F) for soil and fresh water use. Wood shall not be used in retaining walls or cribs for structures assigned to Seismic Design Category D, E or F.
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