Investigation of the behavior of carbon fiber reinforced polymer confined standard cylinder concrete specimens under axial load

The use of fiber reinforced polymer composites for strengthening in concrete structures has become quite prevalent in recent years. especially, to provide ductile behavior from the structural elements that produced by using the high strength concrete under the load effects, the externally wrapping of these elements with using the fiber reinforced polymer materials comes into prominence as an alternative method for strengthening. these materials with high tensile strength can often be preferred due to their lightweight and easy to apply. in this study, cylinder-shaped concrete specimens with compressive strengths range between 53.13~74.87 mpa, are wrapped one or two layer with using bi-directional carbon fiber reinforced fabric (cfrp). these wrapped specimens were tested under the axial comprehensive loads and the effects of the cfrp wrapping on concrete strength and ductility was investigated. in addition, stress-strain relations obtained from the tested specimens were compared with the results of existing models for strengthened cylindrical specimen with cfrp in literature. as a result, a significant increase was obtained in the compressive strength and deformation capacity of cfrp wrapped specimens. especially, it was observed that the stress-strain values obtained from the two layers cfrp wrapped specimens show good agreement with the values obtained from the models.