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SEC. 91.9603.  DEFINITIONS.
   (Amended by Ord. No. 185,587, Eff. 7/16/18.)
 
   For the purposes of this division, the applicable definitions in CBC Sections 1602, 1613.2, 1902 and 2302; ASCE 7 Sections 1.2, 3.1, 4.1 and 11.2; and the following shall apply:
 
   ANCHORAGE SYSTEM is the system of all structural elements and connections, which support the concrete or masonry wall in the lateral direction, including diaphragms and subdiaphragms, wall anchorage and continuity or cross tie connectors in subdiaphragms and main diaphragms.
 
   COMMENCED CONSTRUCTION is construction pursuant to a valid building permit that has progressed to the point that one of the called inspections as required by the Department has been made and the work for which the inspection has been called has been judged by the Department to be substantial and has been approved by the Department.
 
   EXISTING BUILDING is an erected building for which a legal building permit and a certificate of occupancy have been issued.
 
   FLEXIBLE DIAPHRAGM is any diaphragm constructed of wood structural panel, diagonal or straight wood sheathing, metal decking without a structural concrete topping, or horizontal rod bracing.
 
   HISTORICAL BUILDING is any building designated or currently in the process of being designated as a historical building by an appropriate federal, state or City jurisdiction.
 
   REINFORCED CONCRETE WALL.  A concrete wall that has 50% or more of the reinforcing steel required for reinforced concrete in Division 19, Article 1, Chapter IX of the LAMC.
 
   REINFORCED MASONRY WALL.  A masonry wall that has 50 percent or more of the reinforcing steel required by Section 2.3 or Section 3.3 of ACI 530-05/ASCE 5-05/TMS 402/602-16 (MSJC).  (Amended by Ord. No. 186,488, Eff. 12/27/19.)
 
   RETROFIT is strengthening or structurally improving the lateral force resisting system of an existing building by alteration of existing or addition of new structural elements.
 
   TILT-UP CONCRETE WALL is a form of precast concrete panel construction either cast in the horizontal position at the site and after curing, lifted and moved into place in a vertical position, or cast off-site in a fabricator’s shop.