Fire performance of timber-concrete composite floors

James O’Neill, David Carradine, Peter J. Moss, Massimo Fragiacomo, Andrew H. Buchanan

The use of structural timber systems in large multi-storey timber buildings is restricted due to current fire regulations and a perceived level of risk. This research investigated the fire performance and failure behaviour of timber-concrete composite floors currently under development in New Zealand. Furnace tests were performed on two full-size floor specimens at the Building Research Association of New Zealand, both achieving fire resistance ratings of greater than 60 minutes. The test data and visual observations recorded aided in the development of an analytical model for evaluating the fire resistance of the floors. This was implemented in a spreadsheet that is able to predict the expected fire resistance of these floors for different load combinations, spans, floor geometries and materials.

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