TY - JOUR ID - 4734 TI - Seismic performance of FRP-strengthened RC joints by applying bond effects of concrete-FRP interface JO - Amirkabir Journal of Civil Engineering JA - CEEJ LA - en SN - 2588-297X AU - Nouri, Gholamreza AU - Kamalvand, Morteza AD - Faculty of Engineering, Kharazmi University, Tehran , Iran AD - Faculty of Engineering, Kharazmi University, Tehran, Iran. Y1 - 2022 PY - 2022 VL - 54 IS - 9 SP - 3263 EP - 3286 KW - RC beam-column joints KW - Nonlinear finite element KW - FRP laminate KW - Cyclic loading KW - bond effects FRP-Concrete interface DO - 10.22060/ceej.2022.20456.7430 N2 - In this research, using the nonlinear finite element method, a numerical study has been performed on the seismic behavior of the deficient RC beam-column joints (with non-seismic detailing), and the seismic rehabilitation of these joints by using FRP composite laminates. At first, based on previous experimental studies, a series of RC joint specimens were considered to verify the proposed numerical model. This series of specimens include six RC interior joint specimens with non-seismic detailing and retrofitted with FRP laminates under cyclic loading. Comparison between the load-displacement curves obtained from the numerical model with corresponding experimental data shows that the proposed model is capable to high accurately predict the response of RC joints under cyclic loading. Then, based on the verified model, the performance of two-dimensional (2-D) deficient and strengthened exterior RC joint, three-dimensional (3-D) interior and exterior RC joints with considering the effect of the slab and beam perpendicular to the plane of the frame and also strengthening of (3-D) RC joints with focusing on the behavior of the FRP to the concrete interface is evaluated. It was observed that the failure mode of the retrofitted RC exterior specimens, unlike the deficient specimens, is the formation of the plastic hinge in the beam section. In addition, it is seen that the slab and the lateral beam have a significant effect on the performance of deficient joints, which can increase the resistance of the 3-D specimens by more than 20%; also, in 3D strengthened joints, the possibility of debonding of FRP laminates from concrete is higher than the 2-D model. UR - https://ceej.aut.ac.ir/article_4734.html L1 - https://ceej.aut.ac.ir/article_4734_4adbad2c330536b7c1668724783ab9fa.pdf ER -