Numerical model to evaluate the fire resistance in wooden slabs with cavities

• Author(s): Coelho, D. ; Fonseca, E.M.M. ; Vila Real, P. ; Faria, J.A. ; Arede, António
• Date: 2013
• Persistent ID: http://hdl.handle.net/10198/8805
• Origin: Biblioteca Digital do IPB
• Subject(s): Wooden slab; Fire; Insulated cavities; Void cavities
• Document Type: Conference Object
• Language: English

Description

The main objective of this paper is to develop a numerical model for thermal analysis of wooden slabs with cavities, when subjected to the fire action. The temperature profiles, the charring depth layer and the charring rate will be determined using the finite element method with ANSYS program. The numerical calculation of the temperature profiles will be obtained through a transient and a non-linear thermal analysis, where the material properties are temperature dependent. These properties were established in accordance with the referenced data and numerically calibrated. Two different models of wooden slabs with cavities were studied. One model characterizes a wood slab with void cavities and other with insulation material. To characterize the fire resistance in wooden slabs with insulated cavities or void cavities, different typical curves of charring depth layer will be obtained. A numerical procedure is proposed to identify the heating action into the slab cavities. All numerical results permit the verification of the fire safety in wooden slabs with cavities.