Experimental Study on High-Temperature Creep Behavior of Full-Locked and Galfan-Coated Steel Cables

In a fire, the high-temperature creep effect of steel cables can cause structural failure. Due to differences in fabrication and composition, the high-temperature creep behaviors of full-locked/Galfan-coated steel cables significantly differ from those of general structural steel wires. To accurately predict the creep effects of full-locked and Galfan-coated steel cables, it is necessary to obtain their creep strain at high temperatures. This study conducted high-temperature creep tests on full-locked and Galfan-coated steel cables in the range of 350°C to 500°C under different stress ratios and performed tensile strength tests after the creep test. The results showed that under high-temperature and high-stress conditions, the creep strain rate increases rapidly, and different temperatures and stress levels have an impact on the tensile strength of full-locked and Galfan-coated steel cables after exposure to high temperatures. An improved high-temperature creep time strengthening model is proposed to describe the creep behavior of full-locked and Galfan-coated steel cables at high temperatures. The creep behavior obtained in this experiment and the updated model parameters can provide essential data for accurately predicting the creep effects of full-locked and Galfan-coated steel cables. Tensile strength testing can also serve as a reference for the safety assessment and repair of prestressed structures after a fire.