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Steel deck construction, using composite cold- formed steel deck concrete slabs and noncomposite concrete slabs on cold-formed steel decks shall be as provided in paragraphs (a), (b), (c), (d), and (e).
(a) Cold-formed steel decks shall conform to the requirements of the following document: Specification for the Design of Cold-Formed Steel Structural Members. AISI 1968 Edition as Modified by Addendum No. 1, November 19, 1970.
(b) Structural working drawings, presented to department of buildings for approval, and erection drawings of the steel deck supplier must contain a note indicating the construction loading assumed and reflect the effects of continuity used in designing the steel deck.
(1) The steel deck shall be proportioned to withstand the weight of the wet concrete, the weight of the steel deck, and an assumed uniformly distributed construction live load of 20 pounds per square foot without causing maximum stresses exceeding 0.6 times the specified minimum yield strength of the steel deck.
(2) The steel deck shall also be proportioned to withstand the weight of the wet concrete, the weight of the steel deck, and an assumed 200-pound concentrated construction live load for a one-foot width without causing maximum stresses exceeding 0.8 times the specified minimum yield strength of the steel deck.
(c) Where it is determined that the assumed loading criteria shown on the structural working drawings are to be exceeded, the structural engineer and department of buildings shall be so notified by the concrete contractor. In accordance with Chapter 4-376 of the Chicago Municipal Code, it is the responsibility of the concrete contractor to provide a properly designed supporting system for carrying the actual construction loads.
(d) Deflection due to construction loading shall be limited to 1/180 of the actual span during construction but shall not exceed three-quarters inches.
(e) The deck shall have adequate bearing and fastening to supporting members to maintain position of deck during construction.
(1) Steel decks shall be attached to supporting beams at the ends of the deck and at intermediate supports by welding and/or mechanical fasteners. When decks are thinner than 20 gauge, weld washers shall be used for puddle welds as necessary to obtain sound welds and prevent burns.
(2) Steel deck distortions and/or deformations caused by construction methods must be repaired by suitable methods to restore section properties, or the metal deck sections must be replaced prior to concreting operations.
(Prior code § 74-6; Amended. Coun. J. 9-13-89, p. 4604; 6-14-95, p. 2841; Amend Coun. J. 3-5-03, p. 104990, § 32; Amend Coun. J. 11-13-07, p. 14999, Art. II, § 1)