Fire performance of hollowcore floor systems in New Zealand
The 2006 version of the New Zealand Concrete Standard NZS3101 has introduced two new details for connection of precast and prestressed hollowcore floor units to supporting reinforced concrete beams. Although these amended connection details have been experimentally proved to yield better seismic performance of the building, concerns about their performance in fire still remain. A simplified and novel approach to model the two way action of hollowcore floor slabs with topping is established. This paper analytically investigates the fire performance of the precast and prestressed hollowcore floor units connected to the supporting moment resisting reinforced concrete building frames according to the old practice and the improved details recommended in NZS3101 using the finite element tool SAFIR. The simulation results show that rigid connections between the hollowcore floor systems and perimeter beams provide better fire resistance than rotationally flexible connections.