Author(s)

S. Sakji, R. B. Martinez

Abstract

Composite roofs are widely used in the construction of buildings. They offer thermal and acoustical advantages of isolation. According to mandatory texts, their behavior under fire and their contribution to fire must be cheked and accepted before they can be used in construction. The ISO-13784-1 standard describes an experimental bench and a procedure for mesuring the contribution of horizontal elements. According to this standard, hot gas produced by the combustion in the upper side of the tested element and the gas coming from the room are melted together. It is not possible to distinguish between them and to analyse the gas produced in the test room which is the most relevant to take a decision about the people safety. In order to comply with this request, the CSTB has proposed and set on an innovative solution, BSTMC (Bench of Thermal Sollicitation and Caloremetric Measure) based on a minor modification of the ISO 13784-1 bench. This article aims at showing the part A of a work performed in order to characterize the BSTMC and to analyse the impact of the modification introduced. The first step consists of developing a numerical model of the BSTMC validated by experimental results. For this task, the Fire Dynamic Simulator (FDS) code is used. The second step consists of perfoming a parametric analysis combining different relevant parameters (design parameters, extraction power…).

Keywords

ISO 13784-1, sandwich panels, fire test, ISO 9705, FDS, CFD