Effects of model corner fabrication errors on the aerodynamic forces and vortex shedding characteristics of a shallow box girder

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (6) : 181-188.

ZHU Zhiwen,LI Hongbo

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Abstract

One of major concerns, when carrying out bridge sectional model tests, is the effect of model corner fabrication errors on the aerodynamic forces and vortex shedding property of a shallow box girder, which has not been addressed at current time.The Reynolds-averaged Navier-Stokes equations and SST  k-ω turbulent model were used to do the simulation of the flow field around the rigid box girder section of the main span of the Great Belt East Bridge.For different kinds of corner rounding radius, the flow pattern around the girder section, the mean aerodynamic coefficients and vortex-shedding frequency were obtained.The results show that the increase of corner rounding radius can decreas the flow separation intensity, while the flow separation point will no longer keep fixed.The simulated mean aerodynamic coefficients and Strouhal (St) number indicate the minor influence of different corner rounding configuration.The further study shows that the leading edge rounding presents small and negligible Reynolds number effect on the mean aerodynamic coefficients and St number.It is suggested that the effects of corner rounding with small radius can be neglected in bridge wind resistant design.It is also suggested that corner rounding with small radius at the leading edge can be adopted in CFD simulation, which will help decrease grid number, improve mesh quality and reduce CFD computational cost.

Key words

box girder / computational fluid dynamics（CFD） / aerodynamic force / vortex shedding / corner rounding with small radius / Reynolds number effect

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ZHU Zhiwen,LI Hongbo. Effects of model corner fabrication errors on the aerodynamic forces and vortex shedding characteristics of a shallow box girder[J]. Journal of Vibration and Shock, 2020, 39(6): 181-188

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