The behavior of composite floors under fire (Case Study: The building of Maskan Mehr in Kermanshah province)

Nowadays, a simple composite floor consisting of the concrete slab and steel castellated beam is considered as one of the most economical floors in the steel structures. However, due to the permanent danger of fire in buildings, it is essential to evaluate the composite floor's behavior against fire. Therefore, in the present study, the performance of the composite floor of the Building of Mehr House in Kermanshah province is investigated as a case study. In this study, non-linear coupling temperature-displacement analysis and explicit method in Finite element software and linear temperature analysis are applied to analyze the models. The results showed that with increasing temperature, the role of steel castellated beam decreased and the role of the concrete part was increased, thus, in the designing and rehabilitating the composite floors by considering the tensile membrane action of the concrete slab, the reinforcement costs could be reduced. Moreover, the results show that the composite floors of the building were designed such that they do not collapse during the fire and lose their operation due to the considerable fire during the fire. finally, predicting the failure of the building during a fire can be investigated due to the loss of strength and stiffness of the columns and connection during the fire.