Laboratory investigation of reinforced concrete beams with several samples of FRP fibers under bending test

Mohammadreza Valipour¹ Hamid Asadi Ghalhora² Mona Saeedloei³

1) Faculty member of IAU &CEO of ASTCO
2) M.S graduated of IAU
3) Graduated of IAU

Publication : 7th International Conference on Applied Researches in Science & Engineering (7carse.com)
Abstract :
Using fibers to repair and strengthen concrete elements is a very effective method that has been used in recent years. By using FRP fibers, the bending and shear capacity of beams and columns and other concrete components can be significantly increased. In this article, the changes in flexural strength and strain of 36 standard rectangular cube concrete beam samples, including six control samples and thirty beam samples reinforced with five different types of FRP fibers under seven-day and twenty-eight-day bending loading, are investigated in the laboratory. Due to the low weight of fibers, strengthening with them does not have an effect on increasing the weight of the structure, which is important compared to other methods of strengthening concrete structures. Also, due to the low thickness of the fibers, there is no change in the architecture of the structure, these factors can be one of the most important advantages of these fibers. In general, the use of FRP fibers, especially carbon fiber 200, is recommended as a suitable material for strengthening and improving structures. According to the tests and the increase in load capacity of the reinforced samples compared to the control sample, it was found that the operation of strengthening concrete beams is very satisfactory. One of the important points of the three types of carbon fibers compared to the control samples was that the carbon samples under a force of 100 newtons and even in some samples under a force of 200 newtons had zero deflection, which is a very good characteristic for the design of reinforced concrete structures. It is made with FRP carbon fibers
Keywords : Retrofitting FRP fibers bending test bending strength