A Streamlined Box Girder Eddy Vibration Suppression Structure

Abstract

The invention discloses a streamlined box girder vortex vibration suppression structure, which is attached to the arrangement of anti-collision railings on the bridge deck and is used to suppress the vortex-induced vibration of the streamlined box girder of a long-span bridge. It is characterized in that the anti-collision railings on both sides of the bridge deck A vertical vortex vibration suppression plate is installed at a certain interval at the support of the column. The distance between the vortex vibration suppression plate and the edge of the column is 120mm to 160mm; the width of each vibration suppression plate is the same as the distance L between the columns of the anti-collision railing. The plate height D needs to meet 0.5≤D≤H, and the installation distance B of the vortex vibration suppression plate needs to meet 3≤B / L≤5, and B / L takes an integer. The structure of the invention overcomes the disadvantage that the vortex-induced vibration of the main girder caused by the streamlined box girder deck railing cannot be suppressed by directly modifying the railing itself. Its aerodynamic layout starts from the source of vortex-induced vibration and fundamentally weakens the span-to-span correlation of the vortex-induced force of the main girder, thereby reducing the vortex vibration amplitude of the main girder, increasing the comfort of the bridge, and ensuring the streamlined box Structural safety of beam main beam.

Description

technical field [0001] The invention relates to the field of bridge wind engineering, in particular to the field of vortex-induced vibration control of a streamlined box girder of a long-span bridge. Background technique [0002] The streamlined box girder commonly used on long-span bridges has a good aerodynamic shape ( figure 1 ), and the aerodynamic stability is good. When the main beam is not equipped with auxiliary structures such as railings and maintenance tracks, the phenomenon of vortex-induced vibration rarely occurs. However, when the auxiliary facilities are installed on the main girder, the aerodynamic shape of the streamlined box girder changes, which causes vortex-induced vibration of the main girder. Vortex-induced vibration will affect the comfort of the bridge, and even affect the structural safety in severe cases. It is necessary to find reasonable and effective vibration suppression measures. [0003] Existing research results show that the main reasons...

AI Technical Summary

Problems solved by technology

Usually, installing deflectors on both sides of the overhaul vehicle track at the bottom of the girder can suppress the vortex-induced vibration caused by the overhaul vehicle track, but when the railing on the bridge deck is the main cause of the vortex-induced vibration of the girder, this measure cannot effectively suppress the vortex vibration

At present, no vibration suppression structure has been proposed for the vortex induced vibration caused by bridge deck railings ( figure 2 )

In addition, the shape and structure of the anti-collision railings of highways and railway bridges in my country are determined by relevant specifications, and the purpose of vibration suppression cannot be achieved by directly modifying the structure of the railings themselves.

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