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The design of tray floors under fire conditions is well established and fire ratings can be achieved in a number of ways. While the use of suspended ceilings and to a much lesser degree sprayed coatings, are accepted means to satisfy fire requirements, this manual concentrates on the use of the inclusion of fire emergency reinforcement (FER).
In this respect reliance is placed on the HERA report R4-82 “Calculation of the Design of Fire Resistance of Composite Concrete Slabs with Profiled Steel Sheet under Fire Emergency Conditions” dated 1994. This document has formed the basis of fire resistance design for tray flooring since its publication and is generally accepted as providing a system of governing criteria for compliance with the New Zealand Building Code.
Designs in this manual are restricted to the tray floor only and specifically exclude fire resistance to any structure which supports the tray floor. As an extension to this, where the supporting structure interacts with the tray floor, then this invalidates designs prepared in this document. While not limited to this, where a flooring system is considered to be restrained with regard to shrinkage, then specific design is required, which is outside the scope of this document.
Other cases also arise which require the structural engineer in consultation with the fire consultant to assess as a project to project basis before applying any design of Emergency Fire Reinforcement. in the case of restrained systems, catenary action of reinforcement may develop away from the edges of the floor with the reinforcement then acting in direct tension rather than bending.
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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