عنوان مقاله [English]
Repairing and strengthening of structures are unavoidable. The main reasons for repairing and strengthening of concrete structures are improper design or construction, weakness of the structural elements, changing the usage of the building and damaged that happened in structural elements. There are various ways for strengthening the vulnerable structures. In recent years, usage of high strength concrete reinforced with textile meshes (textile reinforced concrete (TRC)) for strengthening the concrete structures has become a proper alternative for retrofitting the buildings. This method is also known with the names of textile reinforced mortar (TRM) or fabric-reinforced cementitious matrix (FRCM). Using reinforced concrete with TRC is one of the new methods for strengthening the concrete structures. This method becomes popular in recent years due to its light weight, high strength, no changes in the dimensions of reinforced concrete elements and ease of use. The aim of this study was to evaluate the efficiency of this method for strengthening concrete columns with low reinforcement ratio that need reinforcement. In this investigation, after verifying two models simulated by finite element software (ABAQUS) with experimental results, eight models were studied numerically. The models were consisting of columns and supporting beams and categorized in four groups by different parameters which are effective in strengthening the concrete columns. In this paper, various parameters such as geometry of cross-section, mortar strength, number of textile layers were investigated. The columns and their connections to supporting beams were strengthened with TRC. Models strengthening were carried out by using vertical layers plus a horizontal layers of textile meshes in cement mortar. Lateral force capacity, crack and stress pattern on concrete and mortar surfaces and yielding of rebars in reinforced concrete columns were compared and evaluated. The cyclic behavior of all of the TRC strengthened models were improved compare to the not strengthened ones.