Behaviour of Normal Reinforced Concrete Slab Under Fire

Abstract

Abstract: The deterioration of reinforced concrete structures due to exposure to fire and high  temperatures remains a major challenge in structural engineering. High temperatures                negatively affect the mechanical properties of concrete, particularly its load-bearing capacity, which can   lead to premature structural failure before the designed service life. In this              experimental study, five reinforced concrete slab specimens, each measuring 1000 × 400 mm, were prepared and tested. The concrete was poured with varying reinforcement ratios ranging  from 0.0037, 0.009, 0.012, 0.0075, and 0.007, while the slab thicknesses ranged from 50 mm to 80 mm. The specimens were subjected to various thermal exposure conditions to evaluate the  effects of fire-induced deterioration on their structural behavior. All specimens were then tested under a single-point central load at mid-span until structural failure occurred. The results       indicated a significant decrease in the compressive strength and load-bearing capacity of          concrete between (25-75%) at  elevated temperatures