Advances in Mechanical Properties and Bonding Behavior of FRP-Reinforced Concrete Structures

Steel corrosion severely degrades the performance and shortens the service life of reinforced concrete structures, especially in harsh environments like offshore areas. Fibre-reinforced polymers (FRP) bars, with their lightweight, high-strength, and corrosion-resistant advantages, have become an ideal alternative to traditional steel bars, making FRP-reinforced concrete structures a research focus in civil engineering. This article systematically reviews the research progress of FRP-reinforced concrete structures: In terms of bonding performance, the composition and failure mechanism of the bond between FRP bars and concrete have been clarified via pull-out tests, though long-term durability and dynamic fatigue performance still need improvement; In terms of component mechanical performance, the mechanical characteristics, failure modes, and key influencing factors of FRP-reinforced beams, columns, and slabs have been elaborated, yet existing design methods require further revision based on experimental results; In terms of application prospects, FRP bars can reduce engineering costs and promote green development, with significant potential in harsh environment projects. Notably, the practical application of FRP still faces challenges: long-term performance degradation under complex environmental conditions, limited compatibility with environmentally friendly materials, and unclear mechanical behavior under fire. The review provides theoretical support for the wide application of FRP-reinforced concrete structures, and its insights into performance optimization and design method revision are of great significance for updating relevant design codes and promoting the sustainable development of civil engineering.