How to make holes in re-entrant deck–SD53-600

Re-entrant deck SD 53-600 sheets acts as longitudinal tensile reinforcement similarly to conventional bar or fabric reinforcement does in concrete slabs. Consequently, holes in SD 53-600 sheets, to accommodate pipes and ducts, reduce the effective area of the re-entrant deck and can adversely effect the performance of a slab. Some guidelines for holes are:

• Place holes in the central pan of any metal composite deck, with a minimum edge   distance of 15 mm from the rib gap.

• Holes should be round, with a maximum diameter of 150mm.
• For slabs designed as a continuous slab: space holes from an interior support of the slab no less than one tenth of a clear span.

Note: In the event of SD 53-600, the ribs of metal composite deck being cut for larger penetrations, sufficient reinforcing steel and detailing is required to replace lost SD 53-600 ribs. Attention to propping at these locations is essential.