Browsing by Author "Tahraoui, Abid"
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- New developments for the calculation of the sagging moment resistance on composite slabs with steel deck exposed to firePublication . Tahraoui, Abid; Piloto, P.A.G.; Benlakehal, NouredineThis work is developed using the 2D finite element method using non-linear thermal analysis. Different slab geometries (re-entrant and trapezoidal) were simulated, using different concrete thicknesses. This composite solution consists of a concrete coating poured onto a steel deck. Concrete is usually reinforced with a steel mesh, but it can also contain individual steel bars. This composite solution is widely used in all types of buildings and the solution method requires the characterization of the materials at elevated temperature in accordance with regulations and standards. The composite slab must meet the fire safety requirements of the building code. The fire resistance of these items is usually evaluated using standard fire resistance tests. Test samples are being prepared in agreement with the materials at elevated temperature and thermal resistance between the steel deck and the concrete must be considered. Annexe D of EN 1994-1-2 provides guidelines for the temperature calculation of the 4 components (every part of steel deck: lower flange, web, and upper flange and rebars) and also calculation the sagging moment of a composite slab with steel deck. However, in the past two decades, no revisions have been made to these methods. The main work developed in this thesis consists of the development of numerical models for thermal analysis, using the ANSYS software. In order to study the effects of different parameters on the sagging moment of the composite slab. A total of 24 numerical simulations were carried out considering an air gap between the steel deck and the concrete topping. The results show that the calculation rules given in European standards are generally conservatives and do not consider important parameters.