Evaluation of FRP Bars Performance under High Temperature

Fiber reinforced polymer bars are increasingly used in the construction industry. Strength, durability and stability are the main criteria for selection and design of FRP. However in case of exposure to high temperature, the change in the material properties affects the overall structure performance. Extensive materials evaluation and numerical modeling are needed to determine any repair/demolish recommendations. FRP bar is one of the main choices for high corrosion resistance in sever environmental conditions. However, FRP materials lose their strength and stiffness at early stage due to high temperature. Many investigations have been carried out on the performance of FRP bond strength exposed to high temperature.In this paper, two different groups of Glass fiber reinforced polymer (GFRP) specimens were tested to determine the effect of the high temperature. Tensile test was applied on all specimens with three different speed rates where the critical temperature for this experiment was 350 °C. From the results and the graphs, the effects of the temperature were explained and analyzed. It showed a reduction of 32% in the tensile strength due to high temperature exposure and an increase in its ductility.