Description
Bonded carbon fiber-reinforced polymers (CFRP) strengthened damaged steel structures show good application prospects in improving the load-bearing capacity and service life of steel structures. The insufficient performance of the bond interface is a core issue affecting the stability and durability of the CFRP-steel bond system. Firstly, this study discussed the influence of the mechanical properties of CFRP and adhesives on the bond behavior of the bond system. Then, the application prospects of nano-modification and novel film adhesives were reviewed. Next, the influence of bond length and film thickness on the bond behavior and failure mode of the CFRP-steel bond system was analyzed. Subsequently, the influence of the geometric configuration of the CFRP-steel lap joint on bond performance was summarized. Finally, the influence of environmental factors, including high temperature, moisture and relative humidity, ultraviolet rays, freeze-thaw cycles, subzero temperature, hygrothermal, and dry/wet cycles, on the bond behavior was analyzed. The results show that it can improve the bond and high-temperature resistance performance of the bond system using nano-modified or novel film adhesives. By setting a reasonable bonding length and adhesive thickness, the bond strength of the bond joint can be effectively improved. In adverse environments, protecting the adhesive layer from erosion was important. By collecting sufficient tested data, an empirical model for normalized bonding strength degradation at elevated temperature environments was proposed. This study can be used as a reference for CFRP-strengthening steel structures.