Structural reinforcement requirements for slab openings in composite steel deck construction. Openings smaller than ten inches square meeting specific spacing and concrete age criteria require no additional reinforcement. Larger or clustered openings require either additional slab reinforcement or C8x11.5 channel framing. Additional reinforcing bars equal to half the interrupted area must be placed on each side of the opening in each direction. The steel deck is attached to the framing channels, and tension lap splices are provided as detailed.
C - B - A - CHANNEL FRAMING BEAM (SEE PLAN) C8X11.5 C8X11.5 C8X11.5 C8X11.5 (2)#4 ADDITIONAL REINFORCEMENT EACH SIDE SEE NOTE 4 STEEL DECK SPAN DIRECTION OPENING SEE ARCHITECTURE AND MECHANICAL DRAWINGS FOR SIZE AND LOCATION NOTES: 1. NO REINFORCEMENT IS REQUIRED FOR OPENING SIZE LESS THAN 10" x 10" IF ALL OF THE FOLLOWING CRITERIA ARE MET: A. STEEL DECK WILL BE CUT AT LEAST 7 DAYS AFTER PLACING OF CONCRETE B. THE CLEAR DISTANCE TO THE ADJACENT OPENING OR OPENINGS IS 1'-0" OR MORE PARALLEL TO DECK SPAN AND 2'-0" OR MORE PERPENDICULAR TO DECK SPAN 2. SLAB REINFORCEMENT OR CHANNEL FRAMING IS REQUIRED FOR OPENINGS THAT DO NOT SATISFY NOTE 1 3. MULTIPLE OPENINGS THAT DO NOT SATISFY THE SPACING REQUIREMENTS OF NOTE 1 ARE TO BE CONSIDERED CLUSTERED OPENINGS AND SHALL RECEIVE CLUSTERED OPENING ADDITIONAL REINFORCEMENT. CLUSTERS SHALL BE TREATED AS ONE LARGE OPENING FOR SLAB REINFORCEMENT OR CHANNEL FRAMING 4. PROVIDE REINFORCEMENT SHOWN OR PROVIDE REINFORCEMENT BARS TO COMPENSATE FOR SLAB REINFORCEMENT INTERRUPTED AT OPENINGS, WHICHEVER IS LARGER. ALL INTERRUPTED BARS IN EACH DIRECTION SHALL BE COMPENSATED BY ADDITIONAL BARS AT EACH SIDE OF THE OPENING EQUAL TO 1/2 THE INTERRUPTED AREA 5. ATTACH DECK TO CHANNELS (TYPICAL) 6. IF SLEEVES ARE USED, THE SLEEVES ARE TO BE INSTALLED SUCH THAT STEEL DECK WILL BE CUT AT LEAST 7 DAYS AFTER PLACING OF CONCRETE 2'-0" MAX 2'-0" TYP TENSION LAP SPLICE TYPICAL 6'-0" MAXIMUM SLAB REINFORCEMENT 2'-0" TYP BEAM (SEE PLAN) E DETAIL
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