Effects of Elevated Temperatures on RCC Beams: Damage Assessment & Performance Evaluation

Abstract

This study examines how high temperatures affect reinforced concrete (RCC) beams, emphasizing how thermal stresses alter material characteristics and structural performance. According to experimental findings, there is no discernible harm up to 300°C to 400°C; nevertheless, at 500°C, discoloration starts, mild spalling starts at 600°C, and large fractures with light brown discoloration start to emerge at 700°C. Between 300°C and 700°C, compressive strength drastically decreases, ranging from 20% to 80%. Finding fractures, spalling, and strength loss in steel reinforcing is crucial, according to post-fire damage assessment. Remaining strength and structural integrity were assessed using non-destructive testing instruments including the Ultrasonic Pulse Velocity meter and Rebound Hammer. In order to restore fire-damaged RCC elements and guarantee structural integrity and load-bearing capability, strengthening techniques such as the use of GFRP sheets were also investigated. This comprehensive analysis provides insights into performance evaluation and effective repair techniques for fire-exposed RCC structures