火灾环境下带索气承式膜结构热力耦合响应研究

Air-supported membrane structures have been widely used in modern architecture due to their lightweight and efficient characteristics. To enhance wind resistance，cable nets are commonly applied to improve structural stiffness and stability. However，the response of air-supported membrane structures with cable nets under fire conditions remains unclear. A cable membrane heat transfer experiment was conducted to investigate the coupled temperature variation between the membrane and the cables. A cable force measurement experiment was then performed to compare cable forces under ambient and fire conditions. A sequential thermal-mechanical coupling analysis method was established using FDS and ABAQUS software，and its validity was verified. A full-scale engineering model was applied to analyze the effect of fire on the thermo-mechanical response of structures with cable nets（orthogonal and diagonal）. The results show that air-supported membrane structures exhibit time-dependent behavior in both internal pressure and the temperature distribution of the membrane and cable net under fire conditions. Compared with the internal pressure load，the non-uniform temperature field has a smaller influence on the forces and displacements of the membrane and cable net，primarily redistributing stress due to changes in material properties. In addition，compared with orthogonal cable nets，diagonal cable nets are more effective in dispersing stress and restraining displacement under fire conditions，demonstrating superior structural stability.