Wind Resistance Measures of 5,000-Meter Spatial Hybrid-Cable Suspension Bridge in Qiongzhou Strait

Based on the 5000 m super span Qiongzhou Strait suspension bridge with as the engineering background. On the basis of the parallel steel cable suspension bridge, the hyperbolic paraboloid carbon fiber cable net is added to form a new structural system of super long span hyperbolic paraboloid spatial mixed cable suspension bridge. The parallel steel cables bear vertical loads, and the hyperbolic paraboloid carbon fiber spatial cables improve the spatial stiffness of the super long span Strait suspension bridge, and the two groups of cables are mixed to work together.The model of MIDAS finite element analysis is established to analyze the internal force and dynamic modal characteristics of the structure.The results show that: the ratio of torsional frequency to bending frequency and torsional frequency of hyperbolic paraboloid spatial mixed cable suspension bridge are significantly improved, and it has good wind resistance stability. The flutter critical wind speed of parallel steel wire cable suspension bridge is 23.35 m/s, and that of hyperbolic paraboloid spatial mixed cable suspension bridge is 78.34 m/s. In order to resist the super strong typhoon once in a hundred years in Qiongzhou Strait, the technical measures of setting temporary additional anti wind cables are put forward based on the principle of ship anchor cables. The flutter critical wind speed can reach 104.6 m/s. Therefore, the wind stability problem of the 5000 m Qiongzhou Strait super long span suspension bridge is fundamentally solved.