Study on vibration asynchrony in cable system of super-large span suspension bridge with parallel twin cables
Super-large span suspension bridges are susceptible to vibrations under the influence of windloads and heavy traffic. To mitigate the risk of cable collisions in the operational phase of super-large span suspension bridges employing a parallel twin cable configuration, this paper studies the issue of vibration asynchrony between the parallel twin cables. A dynamic analysis model for the wind-vehicle-bridge coupling system is established, encompassing the vehicle subsystem, bridge subsystem, and wind subsystem. Using a specific parallel twin cable arrangement for a super-large span suspension bridge as a case study, 3 cable suspension schemes including separated hanger, shared hanger-cable articulation, and shared hanger-cable rigid connection are comparatively studied under crosswind and random traffic flow conditions. The results show that crosswind is the primary factor causing vibration asynchrony in parallel twin cables, predominantly manifesting as lateral vibration asynchrony. Theshared hanger scheme effectively reduces lateral vibration asynchrony but marginally increases vertical vibration asynchrony. The wind-induced transverse vibration asynchrony of the separated suspension scheme is the highest, with the maximum lateral proximity being approximately 1/4 of the clear distance. A preliminary assessment suggests the absence of collision risk.
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维普
