![]() Also, shear demand in columns becomes bigger in cases of more than one surrounding slab exposed to fire at the same time. The latter plays a main role to increase the capability and ductility of the slab at longer fire exposure to compensate the reduction in the flexural capacity. ![]() The model examines mid-span deflection, shear demand on the columns, bending moment and the membrane action of the floor slab. In this study, the behavior of a multi-story flat plate structure during fire exposure is investigated using numerical simulations conducted with using ABAQUS software.Ī three-dimensional finite element model is then carried out on the RC flat slab structure exposed to standard ISO-834 fire at different location arrangements. Also, by comparing the finite element results with the selected experimental study, the results showed a great agreement with the analytical study used in this research. The results showed that the fire effect lead to a decrease in the maximum carrying load of foam concrete slabs by 25%. The lightweight polystyrene foam concrete was used in these specimens with a density of 1820 kg/m³. ![]() The studied specimens were eleven reinforced concrete flat slabs with a thickness of 150 mm. The validity of the adopted models was verified through comparison with a previous experimental study. This analysis has been done using the finite element method by a (ANSYS) software program. The aim of this study is to analyze the behavior of reinforced foam concrete slabs (flat slab type) that are exposed to fire conditions under the influence of eccentric loads as well as concentric loads. Lightweight reinforced concrete (LWC) is widely used in various reinforced concrete (RC) applications, such as its use in diverse types of reinforced concrete slabs. Parameters of the study were the fire direction, load levels, spalling depth, compressive strength of concrete and flexural reinforcement ratio. This paper presents a systematic mapping study (SMS) to quantify the impact of spalling on the reduction of punching shear strength of reinforced concrete slabs exposed to fire and to map experimental and numerical studies. There are very limited studies on the cover spalling impact on punching shear strength. The spalling occurs because of the redistribution of internal forces due to the difference in temperature between the internal structure and the surrounding structure. Concrete spalling reduces the concrete section, and it is associated with the thermal restraint provided to the slabs. Possible explosive concrete spalling during fire influences the reduction of strength and stiffness of the constituent concrete and steel materials. The second one is a brittle failure and do not give visible crack warning signs. The first one is a ductile failure and gives visual tensile cracks in the member. There are two different mechanisms for the failure of flat slabs: flexural and punching shear. Flat slabs are widely used in underground structure, such as parking garages, due to their large surface area, static efficiency, and large span-depth ratios.
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