Improvement of Flexural Performance of Post-Fire Reinforced Concrete Beams Using Anchored Steel Plate
Deliar noor (a), Riawan Gunadi (a*)

a) Department of Civil Engineering, Applied Science Master of Infrastructure Engineering, Politeknik Negeri Bandung, 40559 Bandung Barat, Indonesia

Abstract

The degradation of structural performance due to fire is a critical issue, as it can significantly reduce a structure load bearing capacity after exposure to high temperatures. This study investigates the flexural performance of reinforced concrete beams subjected to fire and subsequently repaired using a 5 mm thick ST 370 steel plate. Three beam specimens, each with dimensions of 15 x 20 x 200 cm and a concrete strength of 25 MPa, were fabricated. These beams were exposed to a temperature of 750 C for 5 hours, resulting in spalling and a noticeable change in the concrete appearance and cross section. The performance of the post fire beam without repair (B01) decreased by 17.4% compared to the control specimen, while the repaired beam (SP5mm) showed a 3% improvement in maximum load capacity. The ductility values for the control specimen, specimen post fire (B01), and specimen repairing with steel plate (SP5mm) were 4.7, 2.4, and 2.3, respectively. The findings suggest that while the steel plate repair method can improve the load capacity of fire-damaged beams, it does not fully restore their ductility

Keywords: Reinforcement Concrete Beam, Post Fire, Anchored Steel Plate

Topic: Materials Science