Research on the vortex-induced vibration performance and vibration suppression of long-span suspension bridge

Single-main-cable suspension bridge is prone to vortex-induced vibration owing to the lower torsional stiffness and smaller damping of the main girder. Based on Yinghua Bridge which is a single-main-cable suspension bridge, this paper researches the vortex-induced vibration characteristics of a large-span single-main-cable suspension bridge through wind tunnel tests. Then seven optimization plans are proposed to suppress vortex-induced vibration. The most suitable plan is proposed for the Yinghua Bridge based on the results of the tunnel tests. The test results show that through the aerodynamic optimization of the main girder, without changing the main features of the main girder, by changing the guardrail or wind deflector, the vortex-induced vibration of the single-main-cable suspension bridge can meet the design requirements.