Twin steel box girder has good flutter performance,but poor vortex-induced vibration(VIV)performance.Effectively suppressing the VIV of twin steel box girder is a key issue that must be addressed in the construction and maintenance of such bridges.Taking a large-span twin steel box girder cable-stayed bridge under construction as the engineering background,the influence of common aerodynamic countermeasures such as guardrails,central breathable grilles,and wind barriers on the VIV performance of the twin steel box girder was studied through section model wind tunnel tests,and a combined VIV suppression aerodynamic countermeasures scheme consisting of wind barriers and central breathable grilles was proposed.The research results show that:(1)The section of the twin steel box girder showed significant VIV at five wind attack angles(0°,±3°,±5°),and further research on main girder vibration suppression measures is required.(2)sealing guardrails cannot effectively improve the VIV performance of the main girder,but using wind barriers can significantly reduce the VIV amplitude of the main girder.(3)the central breathable grille can greatly suppress the VIV of the main girder,but there will be two VIV wind speed ranges.(4)the combined use of wind barriers and central breathable grilles can effectively suppress the VIV of the main girder.The research findings can provide a reference for the design of aerodynamic measures for suppressing VIV of similar twin steel box girder.
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