Abstarct: The Aim of the present research is behavioral assessment of repairing concrete frxames. To fulfill this purpose, the research has been organized into four sections. In section 1, some mechanical charcteristics such as tensile and shear strength and fracture energy have been specified on the integrated concrete and cold joints through experimental tests. The results indicated 50-85 percent decline in all mentioned parameters. In section 2, a 4-point bending test has been performed on integrated and repaired beams. Consequenses illustrated remarkable reduction in some parameters such as absorbed energy, ductility and stiffness. Also, Difference of peak loads between control and the repaired beams is inconsiderable. Relatedly, in section 3, the result of numerical simulation of the beams have been compared with the experimental achivement from section 2. A satisfying agreement on both results can be percieved. To broaden the numerical application, section 4 has been devoted to investigating behavior of repairing frxames in their covers numerically. Results revealed that repaired frxames performance were not influenced in terms of ductility, peak load, initial stiffness, yield stiffness and energy absorbtion capacity.