Numerical investigation on exterior reinforced concrete Beam-Column joint strengthened by composite fiber reinforced polymer (CFRP)

Abstract

In this paper, the effectiveness of composite fibre reinforced polymer (CFRP) layers for exterior beam-column connections was studied through a finite element model (FEM). ABAQUS environment (Hibbitt et al., 1988) was used for finite element analysis and a model based on a previous experimental test was made. The FEM results were validated by comparing with previous experimental test results. This model was developed to analyse rehabilitation of exterior beam-column connection. Five exterior reinforced concrete beam-column joint specimens, including a control specimen (non-retrofitted) and four retrofitted specimens with altered arrangements of CFRP were developed. From the realistic nonlinear analysis of reinforced concrete (RC) connections with FRP overlays, it was determined that L shape overlays from FRP composites at the beam-column, is an appropriate usage to increase ductility. In addition, U shape overlays under the beam and the use of FRP on both lateral sides of the beam are very good strengthening strategies for strength and ductility enhancement of the RC joints. However, FRP only on the top and bottom of the beam decreases the ductility.   Key words: Finite element (FE), reinforced concrete (RC), composite fiber reinforced polymer (CFRP), beam.