Research On Influence Of Handrail Structures Of The Π Bridge Section On Vortex-induced Vibration

In recent years, with the constant improvement of the bridge design and construction level, bridge span increases sharply. Bridge structure tends to be long-span, light weight, low damping, making the study of vortex-induced vibration of the bridge more and more important. In bridge design, Π bridge section because of its good economy, began to be widely used in long-span bridges. For the Π type bridge section of vortex-induced resonance problem, many scholars have done a lot of research both at home and abroad. But for the handrail structure change factors that affect Π bridge section vortex-induced vibration, there are few scholars to make detailed research. Thus changes on the handrail structure influence factors on the Π bridge section type vortex vibration has important theoretical significance and engineering application value.This paper selects the Π bridge section of Aojiang river extra-large bridge as engineering background to study. Rely on the wind tunnel test to study the influence of the handrail leak rate to vortex-induced vibration of Π bridge section. The numerical simulation is used to study the influence of the handrail beam cross section type, height, angle to vortex-induced vibration of Π bridge section, getting the optimization of section form, parametric height factor λ, reasonable angle θ and ventilation rate φ to control vortex-induced vibration and provide the reference and the basis for this class of bridges in wind resistance design. Finally, explain the internal causes of vortex-induced vibration and verify the results of numerical calculations through the flow visualization of the velocity and vorticity fields, the mean and variance of root surface pressure coefficient values, etc.