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Influence of concrete thickness on the natural fire resistance of composite SLABS

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Resumo:This work studies the thermal behavior of composite slabs under controlled test conditions, which correspond to a natural fire from below. 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 requires fire resistance 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 fire resistance criteria on the stability (R), integrity standards (E) and insulation (I) must be considered. Annexe D of EN 1994-1-2 provides guidelines for the calculation of fire resistance (I) and temperature of steel and unprotected parts of steel decks exposed to fire. However, over the past two decades, no revisions have been made to these methods. The main work developed in this thesis consists in the development of numerical models for thermal analysis, using the MATLAB software. In order to study the effects of different parameters on the fire resistance (I) of the composite slab a total of 96 numerical simulations were carried out considering the perfect contact and 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. This work provides improved equations for estimating the fire resistance (I) in function of the effective thickness.
Autores principais:Amira, Sirine
Assunto:Composite SLAB Fire resistance Heat transfer Finite element method Numerica simulation Matlab
Ano:2020
País:Portugal
Tipo de documento:dissertação de mestrado
Tipo de acesso:acesso aberto
Instituição associada:Instituto Politécnico de Bragança
Idioma:inglês
Origem:Biblioteca Digital do IPB

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