Inter-groove apron board for improving vortex vibration performance of double-amplitude bridge and double-amplitude bridge

Abstract

The invention discloses an inter-groove apron board for improving vortex vibration performance of a double-amplitude bridge, the double-amplitude bridge comprises two main beams, each main beam extends along the bridge direction, the two main beams are arranged side by side along the transverse bridge direction, an open groove is arranged between the two main beams, the inter-groove apron board is arranged at the open groove, and the inter-groove apron board extends along the vertical direction. The invention also provides the double-amplitude bridge. The inter-groove apron board is vertically fixed between the upstream main beam and the downstream main beam, vortexes of wake flow of the upstream main beam are prevented from falling off and acting on the downstream main beam, the vortexes are isolated, and vertical excitation of the section of the bridge is reduced, so that the situation that the downstream girder generates large-amplitude vibration is avoided, the pneumatic interference effect between the upstream girder and the downstream girder is effectively reduced, double-amplitude bridge vortex vibration is eliminated, the driving comfort and safety are ensured, the section form of the main beam does not need to be adjusted, the structural cost is reduced, main beams with different sections can be adapted to, and the application range is wide.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to an inter-trough skirt plate and a double-width bridge for improving the vortex vibration performance of the double-width bridge. Background technique [0002] With the continuous innovation of design theory, construction technology and new materials, the bridge structure presents a development trend of larger span, softer system and lower damping. Wind-induced vibration has become an important factor to be considered in the design process. The main forms of wind-induced vibration of long-span bridges can be divided into flutter, eddy vibration and buffeting. Flutter is a phenomenon of aeroelastic instability, manifested as torsional single degree of freedom or divergent vibration coupled with bending and torsional degrees of freedom under high wind speed. Once it occurs, it will cause large vibrations or even collapse of the bridge structure; Random limiting vibratio...

AI Technical Summary

Problems solved by technology

The aerodynamic measures mentioned above can only suppress the vortex vibration caused by the vortex shedding of its own cross-sectional shape, but cannot cut off the vortex vibration caused by the mutual interference effect of the upstream and downstream box girders

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