NUMERICAL MODELING ON BEHAVIOUR OF REINFORCED CONCRETE EXTERIOR BEAM-COLUMN JOINT RETROFITTE WITH EXTERNALLY BONDED FIBER REINFORCED POLYMERE (FRP)

S.Vijaya, B.Shivakumaraswamy, Ravikiran K.V

Abstract: Retrofitting of existing structure is one of the major challenges that modern civil engineering Structures have demonstrated that most of them will need major repairs in the near future. Until early 1990s, concrete jacketing and steel were the two common methods adopted for strengthening the deficient RC Beam Column Joints. A new technique has emerged recently which uses fiber reinforced polymer sheet such as carbon fiber reinforced polymer (CFRP), glass fiber reinforced polymer (GFRP) and aramid fiber reinforced polymer (AFRP) sheets to strengthen the beam-column joint. Also, recent research has attempted to simulate the behavior of reinforced concrete structures strengthened with FRP composites using the finite element method (FEM). In the present study, finite element modeling of a RC exterior beam-column joint retrofitted with externally bonded FRP is carried out with the help of commercially available software ANSYS 13.0. First, the control specimen is analyzed and the results obtained are compared with an experimental study from the literature. Then, the specimen is retrofitted with externally bonded glass-fiber-reinforced polymer (GFRP) sheets with different wrapping schemes and analyzed. The results from the retrofitted specimens are then compared with the results of the control specimen. It is found that for the control specimen, the values of the yield load and ultimate load obtained in the ANSYS are very close to the values obtained from the experimental study. Comparison between the load-deflection results obtained from the ANSYS for the control and retrofitted specimen. This is accompanied by the limited deflections for the retrofitted specimen as compared to the control specimen. The deflection ductility ratio and energy absorption has also increased for the retrofitted specimen

Keywords: Beam-Column Joint, Retrofitting, CFRP sheet, GFRP sheet, AFRP sheet, ANSYS 13.0

DOI: https://doi.org/10.15623/ijret.2014.0318037