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Wave-shaped air nozzle structure for box beam of large-span bridge based on three-dimensional flow control technique

A control technology, three-dimensional flow technology, applied in the field of long-span bridge box girder corrugated tuyere structure, can solve the problems of weakening structural flutter stability and complex flutter mechanism, so as to delay the separation of leading edge vortex and improve wind vibration Stability, the effect of increasing the critical wind speed

Pending Publication Date: 2018-09-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flutter mechanism is relatively complex, and improper control measures will also weaken the flutter stability of the structure itself.

Method used

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  • Wave-shaped air nozzle structure for box beam of large-span bridge based on three-dimensional flow control technique
  • Wave-shaped air nozzle structure for box beam of large-span bridge based on three-dimensional flow control technique
  • Wave-shaped air nozzle structure for box beam of large-span bridge based on three-dimensional flow control technique

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Experimental program
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Effect test

Embodiment 1

[0017] Such as Figure 1-2 As shown, a long-span bridge box girder variable-section tuyere structure includes a box girder. This structure optimizes the geometric shape of the traditional box girder equal-section tuyere structure with a long longitudinal arrangement. The front and rear edges of the traditional tuyere are used as the The longitudinal wavelength is set at the balance position of the sine wave, thereby forming a wavy tuyere structure of the box girder. The air nozzles of the box girder are arranged in a sinusoidal waveform along the longitudinal direction of the box girder, the wavelength is 0.125 of the cross-sectional width of the box girder, and the amplitude is 0.0125 of the cross-sectional width of the box girder.

Embodiment 2

[0019] A long-span bridge box girder corrugated air nozzle structure based on three-dimensional flow control technology, including the box girder. The air nozzles on both sides of the box girder are arranged in a sinusoidal waveform along the longitudinal direction of the box girder, and the sinusoidal wavelength of the spanwise change is temporarily set to 0.5 times Box girder section width, the amplitude is 0.05 times the box girder section width.

[0020] 1. The average pressure coefficient and pulsating pressure coefficient of the upper and lower surfaces

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Abstract

The invention discloses a wave-shaped air nozzle structure for a box beam of a large-span bridge based on a three-dimensional flow control technique. According to the wave-shaped air nozzle structure,the mutual action degree between vortexes and the structure can be weakened, the vortex vibration response of the structure is controlled, a traditional longitudinal uniform section box beam along abridge is changed into a variable section box beam, air nozzles are distributed along the longitudinal direction of the box beam in a sine wave manner, and the two-dimensional flow properties of frontedge vortexes and tail flow vortexes are broken by vertical vortexes produced by the uneven air nozzles; and the spanwise sinusoidal variation wavelength range is 0.125-0.5 time of the section widthof the box beam, and the amplitude range is 0.0125-0.05 time of the section width of the box beam. The wave-shaped air nozzle structure is simple in structure and has a clear control principle, and the wind vibration stability of the box beam of the large-span bridge can be well improved.

Description

technical field [0001] The invention relates to a wave-shaped tuyere structure of a box girder of a long-span bridge based on a three-dimensional flow control technology. Background technique [0002] Long-span bridges are prone to wind-induced vibration under the action of wind due to their small stiffness and damping. Exciting vibration. Vortex-induced vibration is a kind of limiting vibration with dual nature of self-excitation and forced, which is caused by vortices that alternately shed at the trailing edge of the structure when the air flow passes through the bridge structure. Compared with other forms of wind-induced vibration, the amplitude of vortex-induced vibration is relatively small, but its wind speed is low, usually between 4-10m / s, which can easily affect the safety of pedestrians and vehicles, and cause fatigue damage to bridge components. The flutter that often occurs in bridge box girder structures is a self-excited vibration with pure torsional or bendi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D2/04
CPCE01D2/04
Inventor 陈文礼杨文瀚李惠
Owner HARBIN INST OF TECH
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