With a 350 km/h high-speed railway bridge as the case for study,this study conducted wind speed and direction field tests on the bridge system incorporating wind deflectors at the quarter-span and midspan positions,based on numerical simulations and wind tunnel experiments.By deploying wind speed sensors at these locations,the effectiveness of the wind deflectors was empirically verified.Findings indicate that:(1)During the monitoring period,the maximum instantaneous upstream wind speed at the quarter-span position was 10.5 m/s,while at the midspan,it reached 14 m/s.(2)Following the installation of the wind deflector,wind speeds were reduced by 40%to 60%at a height of 2.5 m above the centerline of the windward track and by30%to 40%at a height of 3.5 m.Notably,the wind speed reduction rates at corresponding heights were consistent between the quarter-span and midspan locations.(3)The wind speed reduction rates observed in actual bridge testing were lower than those obtained from wind tunnel experiments at the same height,primarily due to higher turbulence and larger fluctuations in wind speed and direction in the field,compared to the fixed wind conditions in the wind tunnel.Additionally,no train was present during field testing,whereas a train was included in the wind tunnel experiments.(4)The installation of wind deflectors effectively reduces wind speeds near the tracks,significantly enhancing the safe operational conditions of the bridge.
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