Experimental Study on Aerodynamic Vibration Suppression Measures for Suspension Bridge with Double-Sided Box Steel-Concrete Composite Beams
Steel-concrete composite beams have been widely used in large-span bridges construction due to their excellent mechanical properties.However,as a typical blunt body section,their aerodynamic stability is poor,they have been sensitive to the action of wind,and prone to vortex vibration.Relying on the project of Nanzhen Bridge and taking the double-sided box steel-concrete composite girder suspension bridge as the research background,in this paper,wind tunnel test and CFD numerical simulation methods have been adopted to study and compare the single and combined aerodynamic measures,including closing railings,changing the track position of maintenance vehicles,adding deflectors,stabilizing plates,etc.,to study the aerodynamic vibration suppression performance of the original section of the main girder.Wind tunnel tests have shown that the cross-section of the originally designed double sided box steel concrete composite beam is prone to vortex vibration and exhibits a coupled bimodal vortex vibration of vertical bending and torsion.When using a combination of aerodynamic measures of"closed central guardrail+inward movement of maintenance vehicle track position",the vortex vibration amplitude of the main beam can be significantly reduced,and the vibration control effect is significant.The CFD numerical simulation results indicate that the generation of vortex vibration in the cross-section of the double-sided box steel concrete composite beam is related to the vortex shedding size of the upstream and downstream main beams,and aerodynamic measures to break the vortex shedding size are beneficial for suppressing vibration.The research results of this paper can provide some reference for the design of aerodynamic vibration suppression measures of suspension bridge with double-sided box steel-concrete composite beams in the future.
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