Experimental study on anti-slip performance of galvanized cable-clamped joint at elevated temperature

Cable structures are widely used in large-span constructions due to their flexible shapes, high strength, and lightweight. However, the high-temperature performance of cable-clamped joints affects the overall fire resistance of cable structures. Moreover, the galvanized layer of cable may melt at high temperatures, which decreases the anti-slip capacity. But, the influence of the galvanized layer on the high-temperature anti-slip capacity has not been studied. In this study, the high-temperature anti-slip capacity of a commonly used type of galvanized cable-clamped joints is investigated by various high-temperature experiments. It is found that the anti-slip bearing capacity of the new cable-clamped joint at 300 °C is 60.30%, which is lower than that at the normal temperature. Compared with existing studies, the results at normal temperature are in good agreement with the theoretical values obtained from literature, which validates the correctness of the experimental system. The difference between the high-temperature test results and the theoretical formula calculations is significant, with the minimum difference reaching 28.5%. Furthermore, the anti-slip bearing capacity of the cable-clamp joint decreases as the thickness of the zinc coating at high temperatures. Therefore, galvanized layer thickness and high temperature should be considered in the assessment of the high-temperature performance of cable structures. Compared with the research conclusions of domestic scholars, it can be seen that the test results in this paper are more reliable, which can provide a useful reference for the design of cable structures.