Study on the protection of carbon fiber–reinforced polymer cable anchorage system under bridge deck fire

This study addresses the failure risk of carbon fiber reinforced polymer cable anchorage systems during bridge deck tanker fires. Through numerical simulation, the most unfavorable temperature-rise curve was established. Experimental validation assessed the temperature response of the load transfer medium and the protective efficacy of three types of fire-resistant materials. Results indicate that at 2 m/s wind speed, the most hazardous thermal profile occurs 1 m directly above the tanker’s roof surface. Epoxy-based load transfer medium presents anchoring failure risks beyond 123°C, with temperature gradient attenuation dependent on material thermal properties. Comparative analysis indicates that the fireproof coating-insulating cement composite system provides superior protection compared with single-layer high-silica needle-punched felt. To ensure the carbon fiber reinforced polymer anchoring system maintains 3-h fire resistance integrity, the minimum protective configuration requires either 300-mm high-silica felt, 75-mm insulating cement, or a 2.38-mm fireproof coating.