Seismic Retrofitting of Concrete Beam-Column Connections: Numerical study FRP Strip and NSM Technique

This study investigates cost-effective methods for retrofitting reinforced concrete joints using FRP (Fiber Reinforced Polymer) laminates and the NSM (Near-Surface Mounted) technique. Due to the high cost associated with preparing concrete surfaces and attaching FRP laminates, the study focuses on identifying optimal FRP strip configurations that minimize material use and surface preparation. Finite element modeling in ABAQUS revealed that a combined configuration of X-shape and orthogonal FRP strips achieves load-bearing capacities comparable to full FRP coverage, while reducing FRP material requirements by about ۳۰%. Additionally, the study examined the performance of connections reinforced with FRP composites and CFRP rebars using numerical methods and laboratory results, assessing properties such as force-displacement curves, ductility, hardness, cracking, energy, and plastic strain. The findings demonstrate that the combined use of strip connections and the NSM method effectively enhances the structural performance of concrete beam-column joints, providing a practical and economical solution for seismic retrofitting

کلیدواژه ها:

Seismic Retrofitting ، FRP ، Concrete Beam-Column Connections ، NSM