Numerous kinds of research have been done to find new ways to make structural elements stronger. The use of FRP composite for strengthening is the result of this research. Due to the distinctive properties of carbon fibres and polymer matrix combinations, carbon fibre reinforced polymers are becoming increasingly popular in fibre reinforced composites. A crucial component of concrete technology that aims to improve concrete performance indices during construction and long-term use is the wrapping of concrete structures with fibre polymers. The confinement efficiency of externally bonded FRP jackets can be directly affected by the shape of columns' cross sections. Sections that are circular have a higher benefit of strength than those that are square or rectangular. The radius of the corners is limited by internal steel reinforcement, so rounding the corners of FRP confinement can improve its efficiency. However, the effect is limited, especially for large columns. An experimental investigation into the effect of curvilinearization on a CFRP confined preloaded column is the purpose of this project. Curvilinearized square columns CSC have only been the subject of a very small amount of research, most of which was limited in scope and used small specimens