Abstract:In order to solve the technical difficulties and engineering implementation problems in lightning protection detection of large-span bridges, the lightning protection and disaster reduction scheme is scientifically optimized. By utilizing the operation data of a cross-river suspension bridge from 2019 to 2024, and based on the methods of theoretical modeling, actual measurement comparison and engineering verification, the research is conducted on the technologies such as dynamic calculation of steel bar diversion coefficient, protection design of cable pylon side-striking lightning scene, and optimization of grounding resistance measurement by three-pole angle method. The results show that the non-vertical cable plane geometric modeling is used for cable pylon side-strike lightning protection. For structures above 23.8 m in height, the horizontal lightning interception strips should be laid out every 10 m to form a three-dimensional protection network. The measurement efficiency of the three-pole angle method is three times higher than that of the traditional straight-line method. The grounding resistance error is reduced from 15.6% to 9.2% under the complex geological conditions. After the collaborative implementation of multi-level equipotential bonding and SPD hierarchical protection architecture, the average annual maintenance cost of the bridge is reduced by 25%, which verifies the engineering practicability of the technology. The current research focuses on the optimization and engineering verification of key technologies for lightning protection detection of long-span bridges. In the future, IoT technology can be integrated to deploy the intelligent sensors at key locations such as bridge pylons and cables, enabling the real-time collection of lightning strike data and risk early warning.
