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SEC. 91.2204.  CONNECTIONS.
   (Amended by Ord. No. 182,850, Eff. 1/3/14.)
 
91.2204.1.  Welding.  The details of design, workmanship 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.
 
91.2205.3.  Modifications to AISC 341, Section F2.5, Members, Special Concentrically Braced Frames (SCBF) Modifications.  AISC 341, Section F2.5b. is modified to add a new requirement as follows:
 
   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.