Intelligent reinforcement technology for metal roofs based on fibre optic sensors

Addressing the frequent occurrence of wind-induced accidents on metal roofs of large-span space structures, this study analyzes the causes and forms of recent wind-induced accidents on metal roofs. Building upon this analysis of the wind-uncovering destructive mechanism of metal roofing panels, a novel reinforcement technology is proposed here for metal roofs based on optical fiber sensing technology. Fiber reinforced composite sensing tendons and anchor nodes tailored to the specific needs of practical projects were developed and their performance was verified through a series of tests. The results demonstrated that the mechanical properties of the fiber reinforced composite sensing tendons reach up to 700 Mpa, with a sensing repeatability error of 0.05% and a linearity of 0.999. The new anchor nodes exhibited a minimum tensile strength of 7.52 kN, meeting the existing national specifications for mechanical and sensing properties.