Research on the bond performance of ribbed bars and brick masonry in embedded reinforcement method

The embedded reinforcement method (ERM) is widely used in the seismic strengthening of unreinforced masonry structures (URM). One of the key factors that determines the reliability of this reinforcement method is the bond performance between the ribbed bars and the masonry. In this study, pull-out tests were adopted, ribbed bars, ordinary cement mortar and high-strength-polymer mortar with different strengths were selected to conduct caulking reinforcement on the specimens. The form of damage, bond-slip curves and bond strengths of the specimens were obtained. The bond failure mechanisms of the specimens and the influences of the mortar strength and the bond length were discussed. The mathematical expressions of the bonding parameters between the ordinary mortar-ribbed bars and masonry were obtained, and the bond energy between the ribbed bars and masonry was analyzed. The research results provide the basis for the popularization and application of the embedded reinforcement method.