Abstract: The Hangzhou Gymnasium was built with the cable-netstructure, posing severe fire safety issue, e.g.,high temperature sensitivity and potentia lignition risk of the anti-corrosion layer. In this work, the fire scenarios are designed by considering various fire locations, fire loads, the effectiveness of sprinkler and smoke exhaustsystems. The FDS software is used to obtain the fire temperature rise in large-open spaces,and the temperature rise of structural components is calculated under the most adverse scenario. Based on the numerical result, the fire safety of the cable-netstructure is then analyzed using ANSYS and thermogravimetric tests. This work reveals that the most adverse fire location in the Hangzhou Gymnasium is directly below the edge of the central ceiling, which is owing to the central ceiling’s obstruction of the fire plume and high-temperature smoke. In the most adverse fire location, the highest temperature of the cable-net structure could reach 193 °C. The highest temperature values of the load-bearing cables and tie rods are approximately 119% and 53% higher than the central fire case,respectively. The thermogravimetric test result shows that the ignition temperature of the anti-corrosive coating of the Hangzhou Gymnasium cable-net structure is 244 °C, indicating a low ignition risk. Moreover, under the most adverse load combination, the bearing capacity of the structural components, the critical temperature, the overall stability of the structure, and the maximum vertical deflection at the span center all meet the fire resistance requirements of current standards. This work provides a reference for the fire-resistant design of large-space cable-net structures.

Key words: gymnasium, cable-netstructure, anti-corrosive coating, ignition risk, fire resistance