Experimental study on vortex-induced vibration performance of a wide-deck split-type twin steel box girder
In recent years,split-type steel box girders has gained significant attention as a form of main girder cross-section due to their excellent flutter stability.However,due to its unique structure,further research is needed on their vortex-induced vibration(VIV)performance.This study focuses on the wide-deck split-type twin steel box girder of the Binhai Bay Bridge in Dongguan city.Wind tunnel tests were conducted on a scale of 1/60 sectional model to study the VIV performance of original design and the effectiveness of aerodynamic measures under uniform flow and turbulent flow conditions.Such measures included changing the position of the maintenance vehicle track,installing closed railings,setting up windbreak grilles at the central slot,and installing central cover plates.The results showed that the influence of the airflow at the central slot of the split-type twin steel box girders is significant in generating vortex-induced vibrations.Turbulent flow has a noticeable effect on suppressing torsional VIV but has limited impact on vertical VIV suppression.Changing the position of the inspection vehicle track and guardrails have insignificant effects on suppressing torsional VIV but shows some effectiveness in suppressing vertical VIV.Wind barriers and cover plate with lower permeability at the central slot exhibited more significant suppression of VIV.The height of the vibration suppression measures in the central slot also has a certain influence on the vibration suppression effect.The findings of this study can provide a reference for the wind-resistant design of similar split-type steel box girders and help optimize their VIV performance.
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维普
