Bond behaviour of a stick shape CFRP reinforcement applied according to the NSM-ETS strengthening techniques

Abstract

This paper investigates a hybrid strengthening technique that combines the near-surface-mounted (NSM) technique for flexural strengthening with the embedded through section (ETS) technique for shear strengthening using innovative stick-shaped CFRP rebars. The study focuses on the mechanical properties and bond behavior of 7 mm square-sectioned, 30°-bent CFRP rebars. The mechanical characteristics and bond behavior were evaluated by tensile testing, interlaminar shear tests, and direct pull-out tests. The results of the pull-out tests revealed FRP failure, showing a strong link between concrete and CFRP. The findings illustrate the efficiency of the hybrid NSM-ETS technique for reinforcing structures using stick-shaped CFRP laminates.