Cable-stayed bridge steel plate composite beam capable of resisting vortex-induced vibration

Abstract

The invention discloses a cable-stayed bridge steel plate composite beam capable of resisting vortex-induced vibration, which comprises a bridge deck slab, steel main beams are fixedly arranged at two ends of the bottom of the bridge deck slab, steel cross beams are fixedly arranged between the steel main beams, steel cantilevers are fixedly arranged at the side ends of the steel main beams, and maintenance rails are arranged at the bottom ends of the steel main beams. A stabilizing plate perpendicular to the steel cross beams is fixedly arranged between the middles of the steel cross beams, and flow guiding devices located on the inner sides of the overhauling rails are symmetrically arranged at the bottom ends of the steel cross beams. The flow guiding device is a right-angle triangular prism, the long right-angle side of the section of the flow guiding device is attached to the steel cross beam, the short right-angle side is perpendicular to the steel cross beam, and the bevel edge inclines downwards from the inner end of the flow guiding device. The invention aims to provide the cable-stayed bridge steel plate composite beam, which can solve the wind vibration problem of the cable-stayed bridge, change the air flowing state and improve the wind-resistant stability.

Description

technical field [0001] The invention relates to the technical field of building structures, in particular to a steel plate composite girder of a cable-stayed bridge capable of resisting vortex-induced vibration. Background technique [0002] Due to its light weight, fast construction, strong spanning capacity and good pressure bearing performance, steel plate composite beams are widely used in large and medium span cable-stayed bridges. However, the blunt body effect of the plate-girder composite steel section is obvious, and in order to facilitate maintenance of composite girder cable-stayed bridges, maintenance roads are set below the bridge deck. It is necessary to consider the issue of vortex-induced resonance for the safety of the wind resistance in the period and operation period. The vortex-induced resonance is a kind of limited vibration that occurs at medium and low wind speeds, and it is easy to occur on the steel plate composite beam section. Although it will not ...

AI Technical Summary

Problems solved by technology

However, the blunt body effect of the plate-girder composite steel section is obvious, and the general composite girder cable-stayed bridge is convenient for maintenance, and the maintenance road is set below the bridge deck. For the safety of wind resistance in the period and operation period, it is necessary to consider the problem of vortex induced resonance. The vortex induced resonance is a kind of limited vibration that occurs at medium and low wind speeds, and it is easy to occur on the steel plate composite beam section. Although it will not cause wind damage, However, excessive amplitude may cause structural fatigue and comfort problems

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