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HERA document R4-82 makes a study of a number of slab systems and generalizes, that for tray flooring complying with section 13 NZS 3404, a minimum FRR of 30 minutes is inherent without additional means of fire protection. Further, “explicit analysis of the load bearing capacity of fire exposed composite concrete steel slabs is only necessary for requirements over 30 minutes”.
Consequently,this manual assumes that compliance of 30 minute FRR is achieved by tray flooring without provision for FER. It is further assumed that fulfilment of New Zealand Building Code Requirements is achieved for 30 minute FRR requirements.
11.2 scope of manual - fire resistance calculation of tray flooring
11.6 mezzanines as intermediate floors (model type 4)
11.7 compliance with fire resistance requirements
11.8 - 30 minute fire rated composite floor
11.9 positive reinforced fire rated slabs
11.10 negatively reinforced fire rated slabs
11.11 negative reinforcement calculation
11.12 “slab specification” with regard to negative reinforcement calculation
11.13 loadings used in negative reinforcement tables
11.14 live loadings / fire ratings used
11.15 negative reinforcement tables
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