Shear behaviour of GFRP strengthened RC beams at elevated temperatures

This paper presents a study on thermal behaviour of GFRP sheets and concrete beams strengthened with anchored GFRP U-wraps. The temperatures ranged between 22 degrees C and 150 degrees C for GFRP sheets and between 22 degrees C and 60 degrees C for beams. GFRP sheets showed a sudden drop in its properties as the temperature approached the glass transition temperature, Tg, beyond which stable properties were recorded up to 150 degrees C. The GFRP wraps improved shear strength of the beams by up to 112 % under room conditions and up to 96 % under 60 degrees C. Available FRP shear design guidelines were evaluated, and recommendations were made for elevated temperatures.