Abstract
The main aim of this paper is studied the punching shear and behavior of reinforced concrete slabs exposed to fires, the possibility of punching shear failure occurred as a result of the fires and their inability to withstand the loads. Simulation by finite element analysis is made to predict the type of failure, distribution temperature through the thickness of the slabs, deformation and punching strength. Nonlinear finite element transient thermal-structural analysis at fire conditions are analyzed by ANSYS package. The validity of the modeling is performed for the mechanical and thermal properties of materials from earlier works from literature to decrease the uncertainties in data used in the analysis. A parametric study was adopted in this study, it has many factors such as the ratios of length to thickness, fire temperature, time exposed to fire, concrete compressive strength, area exposed to fires and type of support. It can be concluded from this research the significant factors that affect the punching shear strength. However, the increasing ratio of length to thickness may be lead to increasing the deflection more than 123% at fire condition. Also, the increasing temperature leads to increasing the deflection about 40% at fire condition.
Highlights
Flat slabs are widely used in buildings, parking garages and shopping centers, it provides a large surface area, has static efficiency allows attaining large span-depth ratios, support on the columns which provided more space, easy to carry out and more economical (Brzev and Pao, 2006)
The studies punching shear of flat slabs in fire conditions are very limited. (Arna'ot, et al, 2017), review six experimental studies of the punching shear of reinforced concrete slabs exposed to fires (Kordina, 1997; Salem, et al, 2012; Liao, 2013; Annerel et al, 2013; Ghoreishi, et al, 2015; Smith, 2016), while (Bamonte, et al, 2009; Bamonte and Felicetti, 2009) were numerical analysis studied of punching shear at fire condition. (Kordina, 1997) conducted the first test of the punching shear of reinforced concrete slabs subjected to fires
The results shown that was some different in middle time-temperature curve of (HU75-0.8) model as shown in Fig.7 and Fig.8, that due to the uniform distribution of the temperature on exposed surface to fire in the finite element analysis
Summary
Flat slabs are widely used in buildings, parking garages and shopping centers, it provides a large surface area, has static efficiency allows attaining large span-depth ratios, support on the columns which provided more space, easy to carry out and more economical (Brzev and Pao, 2006). (Liao et al, 2013) showed the fire resistance of the punching shear of twelve reinforced concrete slabs according to ASTM E119 time-temperature curve. (Smith, 2016) showed effect real fires in the punching shear with many parametric: thickness of slabs, steel reinforcement ratio and type of support conditions. A little studies deal with numerical investigation of punching shear of reinforced concrete slabs exposed to fires. Clear from the relevant studies a lot of nonlinear finite elements analysis has been studied for the performance of flat plates exposed to fire under service loads and thermal loads These studied has tended to focus on deformation of slabs, distribution moment and internal force rather than nonlinear finite element punching shear of slabs at fire conditions. Finite element analysis was used in the present paper utilizing ANSYS package version 15, to study affect fire on the punching shear of reinforced concrete slabs
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