Vortex vibration control method for long-span bridges using vertical-axis fans

Abstract

The invention relates to the field of bridge design, in particular to a method for using vertical axial draught fans for conducting vortex vibration control over a long-span bridge. The vertical axial draught fans are arranged at the bottom of a main beam of the bridge, and horizontal wake streams generated after rotation of the vertical axial draught fans under the effect of incoming wind are used for disturbing regular vortex shedding of the section of the main beam. The method has the following beneficial effects that firstly, the vertical axial draught fans do not need to be arranged along the pass length in the span direction of the bridge as those in pneumatic measures commonly used currently, and the investment at a time is relatively small; secondly, the wake streams generated by rotation of fan blades are used for disturbing regular vortex shedding of the section of the main beam of the bridge, a vortex vibration control effect is obvious, and the method is suitable for bridges of different types; thirdly, rotation of the fan blades is used for generating power, and the beneficial effects of sustainability, energy conservation, environment protection and investment reduction are achieved; and fourthly, LED lamps in different colors can be installed on the fan blades, and the lamplight effect of the LED lamps rotating under the effect of natural wind has the long-span bridge landscape changing effect.

Description

technical field [0001] The invention relates to the field of bridge design, in particular to a method for controlling vortex vibration of a long-span bridge by using a vertical-axis fan. Background technique [0002] Bridges in the boundary layer of the earth's atmosphere will inevitably be affected by natural winds, and modern bridge structures are developing towards larger, softer, and slender spans, which will inevitably increase their sensitivity to wind. Bridge structures The problem of wind-induced vibration has become one of the key factors controlling the design of long-span bridges, especially for long-span steel box girder cable-stayed bridges, steel box girder suspension bridges and steel structure continuous girder bridges that are currently being built in large quantities in China. The problem of vortex induced resonance has become the focus of wind resistance research. Vortex-induced resonance, referred to as vortex vibration, is a self-limiting wind-induced v...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for controlling vortex vibration of long-span bridges by using a vertical-axis fan to solve the problems of complex structure, high one-time investment and subsequent maintenance investment in the prior art

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