Abstarct: The methods of strengthening of structures by composite fibers include the external bounded reinforcement method with FRP laminates known as EBR and the method of near surface mounted with FRP rebar or tape. The EBR method is considered as the most common method for strengthening of structures. This method, according to which it is effective to increase the load - bearing capacity of the structure, has fundamental challenges such as vulnerability to fire, impact, adverse environmental conditions and debounding the FRP laminates from the concrete surface. Several researches have been done to reduce the environmental effects and to control the debounding phenomenon of the FRP laminates, and lead to the invention of another method called near-surface mounted. In the near-surface mounted method, FRP strips and rebar are used to strengthen the members of the concrete structure. So far, most researches have investigated the application of FRP rebars using NSM method on concrete beams. Recently, in several cases, the use of a type of manually made rod, which is obtained by twisting FRP sheets around a wooden core with a circular cross section, has been observed to strengthen structures by the NSM method. In the NSM-MMFRP Rods method is used FRP manually made rods called MMFRP to reinforce members of concrete structures. MMFRP rods are made by twisting FRP sheets around a core made of wood or mextal rods. The purpose of this study is to investigate the performance of NSM-MMFRP Rods method in strengthening concrete joints and compare the results obtained from this method with the method of external bounded reinforcement with FRP sheets or the same EBR method under seismic loads. In this thesis, at first the modeling accuracy was done by comparing the results of unreinforced and reinforced specimen by EBR and NSM methods. Also, in order to better understand the behavior of manually made bars, a number of laboratory specimen were made and tested for direct tension. In this research, the proposed specimen including the specimen composed of two methods EBR and NSM, the specimen composed of manually made rods with wooden and steel cores and the specimen composed of NSM method with steel core have been modeled and analyzed. manually made reinforcing bars are a combination of FRP and steel that can be bent to produce L-shaped reinforcing agent and end restraints. baxsed on the results obtained from the analysis of two specimen that were reinforced using NSM method and wood core and the specimen that was reinforced by EBR method, according to the same amount of CFRP of these specimen, the specimen reinforced by NSM method performed better than the specimen reinforced by EBR method. Examining the FRP rupture modes in these specimens, it was found that the NSM method is superior to the EBR method. Also, by analyzing the proposed models, the effect of reinforcement method and arrangement of manually made rods with wooden core and rebar was investigated and the results were expressed baxsed on force-displacement curve, ductility, stiffness reduction and energy absorption and the most suitable arrangement of manually made rods is presented. Regarding the reinforcement methods, it is observed that the EBR reinforcement method, despite being used in many researches, has no applicability in the connections in the structure, while the NSM method can be more easily implemented in the connection in the structure.