Strengthening and retrofitting of construction is in need of exploring new efficient and economical methods, such as using textile reinforced mortar (TRM) which overcomes the drawbacks of traditional methods and can be used in different structure elements. Few researches talk about numerical modeling of strengthening using (TRM), Thus, a two dimensional numerical model was developed using ABAQUS software package. Experimental results in the literature showed that debonding between (TRM) and substrate may be occurred. The current model develops a new technique taking into account the debonding failure mode by modeling the bond between textile and mortar and between (TRM) and substrate using bond-slip, with input based on pull-out tests from literature. The model is validated by a comparison with experimental results of simply supported beam failed either on shear or flexure. A good agreement is observed in terms of loaddisplacement response and type of failure. The numerical analysis extended to include additional parameters on beam-column joint, such as mortar strength and orientation of textile. The result shows that (TRM) is able to increase the load bearing capacity of RC beam-column joint and change its failure mode to be ductile failure.