High-Temperature Effects on Punching Shear Performance of Hybrid Reinforced Concrete Slabs

Scientists tested reinforced concrete slabs for their behavior and strength under punching shear stress. An electric oven was used to experimentally heat reinforced concrete slabs to high temperatures (up to 400 °C), and the punching shear behavior of these slabs is the primary focus of this research. A steel reinforcing mesh with a diameter of (Î6mm) and slab dimensions of (400x400x60) mm was used to construct each of the six models. The concrete used in their construction combined regular and high strength. Using an entirely high-strength concrete mixture results in a 56.65% reduction in deflection, an 80% rise in First Crack Loading (FCL), and a 118.9% increase in Ultimate Load (UL), according to laboratory tests. As a result of layering, the (HSC) mixture was comparable to that of a slab composed completely of (HSC). This provides extra cost advantages compared to utilising a slab with complete high strength. Deflection dropped by 18.19%, whereas FCL and UL increased by 30.0%, 60.0%, and 43.24%, respectively, for a 73% increase. A partial region of a high-strength mixture performed better when the findings were enhanced by expanding the dimensions of the HSC area. Deflection values from the reference slab decreased by 0.91 percent, 10%, and 27.73 percent, respectively, whereas FCL and UL increased by 0% and %, respectively, according to the data. These findings promote cost-effective, fire-resistant construction by optimising material use, enhancing punching shear resistance, and improving structural durability under high temperatures.