Breathing unit flow control device based on large-span bridge wind field three-dimensional spreading disturbance

Abstract

The invention discloses a breathing unit flow control device based on large-span bridge wind field three-dimensional spreading disturbance. The device comprises a breathing unit pipeline, variable frequency axial flow fans and rectification honeycomb devices. The breathing unit pipeline is arranged sharp corners, close to the front edge side and rear edge side, of the bottom of a main beam. Breathing units are arranged at equal intervals in the breathing unit pipeline. The two ends of the breathing units are provided with air suction ports and air blowing air ports correspondingly. The variable frequency axial flow fans are arranged inside and are used for providing suction and blowing flow. The rectification honeycomb devices are arranged at the air ports to form uniform flow. According to the device, the two different effects of air suction and air blowing are generated at the two air ports of a pipeline by adopting a fan, the breathing unit is used as a disturbance source to inhibitthe formation and development of wake large-scale spanwise vortex, and main beam wind-induced vibration is controlled. The breathing units are arranged at certain intervals in the spreading direction, and three-dimensional spreading disturbance control is carried out on a flow field, so that the occurrence of vortex-induced vibration can be effectively inhibited or weakened, and meanwhile, the main beam flutter critical air speed can be effectively increased.

Description

technical field [0001] The invention relates to a three-dimensional spanwise disturbance device for the main girder wind field of a long-span bridge, which can restrain the wind-induced vibration of the main girder. Background technique [0002] In the wind-induced vibration of the main girder of long-span bridges, flutter is a kind of divergent vibration, that is, once it occurs, it will have the danger of collapse and damage to the main girder of the bridge; vortex-induced vibration is a limited vibration, which will cause fatigue damage to the bridge structure . Therefore, suppressing flutter and vortex-induced vibration of long-span bridges has always been an important issue concerned by scholars in the field of structural wind engineering. [0003] At present, the devices commonly used to control the wind-induced vibration of the main girder include passive control devices and active control devices. The passive control devices include flow suppression plates, deflecto...

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Problems solved by technology

[0003] At present, the devices commonly used to control the wind-induced vibration of the main girder include passive control devices and active control devices. The passive control devices include flow suppression plates, deflectors, air nozzles, central stabilizing plates, dampers, etc. Since the control form is fixed, It cannot be adjusted with the change of wind conditions, which leads to great limitations in the improvement of wind resistance stability, and in some special cases, it is not conducive to the suppression of wind-induced vibration; active control devices include aerodynamic flaps, active dampers, etc., However, most of the devices are complex in structure, high in cost and complicated in installation

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