Thermal–mechanical deformation of Galfan-coated steel strands at elevated temperatures

Abstract

The deformation of Galfan-coated steel strands at elevated temperatures causes prestress loss and structural stiffness reduction, which leads to a reduction in the overall bearing capacity and the collapse of the structure. Hence, it is necessary to investigate the deformation of Galfan-coated steel strands at elevated temperatures. In this study, elevated temperature tests were performed on 24 Galfan-coated steel strands, and the deformation behavior of Galfan-coated steel strands of different diameters under eight different stress–temperature conditions were analyzed. The temperature deformation curves of the strands were plotted for temperatures ranging from 30 to 500 °C. In addition, an equation that expresses the relationship between deformation, temperature, and initial stress in the thermal–mechanical coupling state in the heating stage was derived. The parameters in the equation were fitted, and a uniform expression of the parameters was derived. Furthermore, the equation showing the relationship between the parameters for the creep model and temperature T for the constant-temperature stage was established