CN114032779A - Long-span bridge wind vibration control method with wind energy collection function - Google Patents
Long-span bridge wind vibration control method with wind energy collection function Download PDFInfo
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- CN114032779A CN114032779A CN202111419519.XA CN202111419519A CN114032779A CN 114032779 A CN114032779 A CN 114032779A CN 202111419519 A CN202111419519 A CN 202111419519A CN 114032779 A CN114032779 A CN 114032779A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Abstract
The invention discloses a long-span bridge wind vibration control method with a wind energy collecting function, which relates to the technical field of engineering safety and new energy development and comprises the following steps: obtaining the amplitude of the main beam when the horizontal axis fan is installed at different spreading intervals through a wind tunnel test, and determining the spreading interval with the minimum amplitude according to the amplitude of the main beam; the span-wise distance l of the horizontal shaft fan is (0.5-1.2) ls(ii) a Wherein lsH is the height of the main beam, St is the Strouhal number, and the value range of St is 0.15-0.27; according to the local prevailing wind direction and wind speed, and in combination with the size of the cross section of the bridge, horizontal axis fans are installed on the main beam at certain intervals, so that the first vortex disturbs the second vortex; the wind-induced vibration is controlled, and simultaneously, wind energy is collected to generate electricity for the electricity on the bridge. The invention realizes the integration of wind resistance and wind energy collection of the bridge.
Description
The invention discloses a divisional application of a long-span bridge wind vibration control method with a wind energy collecting function, wherein the application number of a master case is 201811308101.X, and the application date is 2018.11.05.
Technical Field
The invention relates to the technical field of engineering safety and new energy development, in particular to a long-span bridge wind vibration control method with a wind energy collecting function.
Background
With the continuous increase of bridge span, the structural rigidity and damping of the bridge are continuously reduced, so that the sensitivity of the bridge to wind is enhanced, and typical wind-induced effects such as flutter, buffeting and vortex-induced vibration gradually become key factors to be considered in the design of the large-span bridge. In various wind-induced effects on the main girder of the long-span bridge, the flutter is wind-induced vibration with very obvious vibration response, and once the flutter occurs, the main girder of the bridge has the danger of overall collapse and damage; vortex-induced vibrations can cause fatigue failure of the bridge structure. Therefore, suppressing flutter and vortex vibration of a long-span bridge has been a major concern of researchers in the field of structural wind engineering.
In the prior art, the large-span bridge wind vibration control measures comprise mechanical measures and pneumatic measures. The mechanical measures are mainly to increase the damping of the large-span bridge structure and improve the rigidity and the like by installing a mechanical device so as to reduce the wind-induced vibration response of the structure; however, the mechanical device is expensive in manpower and material resources both in production and maintenance, and the occurrence of self-excited vibration is not fundamentally solved. The pneumatic measure comprises a passive mode and an active mode; the passive mode is to improve the wind resistance of the long-span bridge by changing the pneumatic appearance of the section of the main beam of the bridge or adding accessories. Because the mode is simple and economical, the air flow type air flow device has been widely applied to practical engineering, wherein the air flow type air flow device comprises a fairing, a flow guide plate, a spoiler, a central stabilizing plate, a central slot, a flap, a tuyere and the like. Although many researches on the passive mode of pneumatic control have been carried out, the methods are control methods based on analysis of a two-dimensional bridge girder section flow field, and the methods not only have limited use conditions, but also generally need to arrange a control device along the span direction of the girder, which undoubtedly increases the cost greatly. The three-dimensional span-wise turbulence control refers to a method for controlling wind vibration by arranging turbulence devices at certain intervals in the span direction of a bridge, and the method is simple, economic and efficient, but the application of the method in the field of bridge wind resistance is still blank.
In addition, the large-span bridge spans across straits, great rivers, canyons and other places, the wind energy resources are rich, and no measure for controlling wind-induced vibration of the bridge and effectively collecting the wind energy resources exists at present.
Disclosure of Invention
The invention aims to provide a long-span bridge wind vibration control method with a wind energy collecting function, and the wind resistance and wind energy collection of a bridge are integrated.
In order to achieve the purpose, the invention provides the following scheme:
a long-span bridge wind vibration control method with a wind energy collecting function comprises the following steps:
obtaining the amplitude of the main beam when the horizontal axis fan is installed at different spreading intervals through a wind tunnel test, and determining the spreading interval with the minimum amplitude according to the amplitude of the main beam; the span-wise distance l of the horizontal shaft fan is (0.5-1.2) ls(ii) a Wherein lsH is the height of the main beam, St is the Strouhal number, and the value range of St is 0.15-0.27;
according to the local prevailing wind direction and wind speed, and in combination with the size of the cross section of the bridge, horizontal axis fans are installed on the main beam at certain intervals, so that the first vortex disturbs the second vortex; the first vortex is a downstream wake vortex generated by wind passing through the horizontal shaft fan; the second vortex is a regular spanwise vortex generated by wind passing through the main beam;
the wind-induced vibration is controlled, and simultaneously, wind energy is collected to generate electricity for the electricity on the bridge.
Optionally, the distance between the impeller center of the horizontal axis fan and the bridge floor is smaller than 1/2 of the height of the main beam.
Optionally, the horizontal axis fan is arranged at the edges of both sides of the bridge deck.
In order to achieve the purpose, the invention also provides the following technical scheme:
a long-span bridge wind vibration control method with a wind energy collecting function comprises the following steps:
horizontal shaft fans are symmetrically arranged on two sides of the main beam, and the regular spanwise vortex generated by wind passing the main beam is disturbed by using the downstream wake vortex generated by wind passing the horizontal shaft fans.
OptionallyAnd the span-wise distance l of the horizontal shaft fan is (0.5-1.2) ls，lsH is the height of the main beam, St is the Strouha number, and the value range of the single box girder St is 0.15-0.27.
Optionally, the horizontal axis fan is arranged at the edges of both sides of the bridge deck.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the span-wise vortex of the wake area of the bridge girder is unstable, the wake vortex of the horizontal axis fan is used as a disturbance source to inhibit the formation and development of the large-scale span-wise vortex of the wake of the girder, so that the wind-induced vibration of the girder is controlled, the three-dimensional span-wise control is realized, the wind-induced vibration is controlled, and simultaneously, the wind energy can be collected for generating electricity for a bridge, such as lighting equipment, a monitoring sensor and the like, so that wind energy resources are effectively utilized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other structural schematic diagrams according to these drawings without inventive labor.
FIG. 1 is a schematic diagram of a wind-induced regular spanwise vortex generated around a main girder in a wind vibration control method of a long-span bridge with a wind energy collection function according to the invention;
fig. 2 is a schematic diagram of a downstream wake vortex disturbing spanwise vortex generated by a wind-induced horizontal axis fan in the long-span bridge wind vibration control method with a wind energy collecting function.
Description of the symbols: 1-regular spanwise vortices, 2-downstream vortices, and 3-disturbed regular spanwise vortices.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and fig. 2, the invention provides a method for controlling wind vibration of a long-span bridge with a wind energy collecting function, which comprises the steps of arranging a horizontal axis fan on a main beam, disturbing a regular spanwise vortex 1 generated by wind around the main beam by using a downstream wake vortex 2 generated by the wind around the horizontal axis fan, and displaying a disturbed regular spanwise vortex 3 in fig. 2.
According to experience, the effect that the distance between the center of the impeller of the horizontal axis fan and the bridge floor is smaller than the height of the main beam is good in 1/2, the optimal position can be determined through numerical simulation, and the position with the maximum wind speed in the distribution diagram of the speed field of the main beam is selected.
Preferably, the spanwise interval l of the horizontal axis fan is (0.5-1.2) ls，lsH is the height of the main beam, St is the Strouha number, and the value range of the single box girder St is 0.15-0.27.
The amplitude of the main beam when the horizontal axis fans are installed at different spanwise intervals can be obtained through a wind tunnel test, and then the spanwise interval with the minimum amplitude is determined.
In order to adapt to the change of the incoming flow wind direction, horizontal axis fans are symmetrically arranged on two sides of the main beam, and the downstream wake vortex generated by any wind direction can generate effective action; the horizontal shaft fans are arranged at the edges of two sides of the bridge floor, flow separation is slowed down in an upstream area, and a downwind vortex can be excited in a downstream area to inhibit wind-induced vibration.
In theory, the downstream wake vortex generated by the horizontal axis fan with any distance and specification parameters can play a certain turbulence effect under the effect of wake negative pressure, and in order to ensure that an ideal turbulence effect is achieved, the specific geometric parameters and dynamic parameters of the horizontal axis fan can be determined by adopting a wind tunnel test.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (6)
1. A long-span bridge wind vibration control method with a wind energy collecting function is characterized by comprising the following steps:
obtaining the amplitude of the main beam when the horizontal axis fan is installed at different spreading intervals through a wind tunnel test, and determining the spreading interval with the minimum amplitude according to the amplitude of the main beam; the span-wise distance l of the horizontal shaft fan is (0.5-1.2) ls(ii) a Wherein lsH is the height of the main beam, St is the Strouhal number, and the value range of St is 0.15-0.27;
according to the local prevailing wind direction and wind speed, and in combination with the size of the cross section of the bridge, horizontal axis fans are installed on the main beam at certain intervals, so that the first vortex disturbs the second vortex; the first vortex is a downstream wake vortex generated by wind passing through the horizontal shaft fan; the second vortex is a regular spanwise vortex generated by wind passing through the main beam;
the wind-induced vibration is controlled, and simultaneously, wind energy is collected to generate electricity for the electricity on the bridge.
2. The method for controlling wind vibration of a long-span bridge with the wind energy collecting function of claim 1, wherein the distance between the impeller center of the horizontal axis fan and the bridge floor is smaller than 1/2 of the height of the main beam.
3. The wind vibration control method for the long-span bridge with the wind energy collecting function according to claim 1, wherein the horizontal axis fan is disposed at edges of both sides of the bridge deck.
4. A long-span bridge wind vibration control method with a wind energy collecting function is characterized by comprising the following steps:
horizontal shaft fans are symmetrically arranged on two sides of the main beam, and the regular spanwise vortex generated by wind passing the main beam is disturbed by using the downstream wake vortex generated by wind passing the horizontal shaft fans.
5. The long-span bridge wind vibration control method with the wind energy collection function according to claim 4, wherein the span-wise distance l ═ 0.5-1.2 of the horizontal axis wind turbines，lsH is the height of the main beam, St is the Strouha number, and the value range of the single box girder St is 0.15-0.27.
6. The wind vibration control method for the long-span bridge with the wind energy collecting function according to claim 4, wherein the horizontal axis fan is disposed at edges of both sides of the bridge deck.
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| CN202111419519.XA CN114032779A (en) | 2018-11-05 | 2018-11-05 | Long-span bridge wind vibration control method with wind energy collection function |
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| CN201811308101.XA CN109356019A (en) | 2018-11-05 | 2018-11-05 | A kind of Loads of Long-span Bridges method for controlling wind vibration with wind energy collecting function |
| CN202111419519.XA CN114032779A (en) | 2018-11-05 | 2018-11-05 | Long-span bridge wind vibration control method with wind energy collection function |
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| CN115163409A (en) * | 2022-07-12 | 2022-10-11 | 哈尔滨工业大学 | Bridge vortex-induced vibration power generation and control method based on vertical wind driven generator |
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| CN111441234B (en) * | 2020-03-27 | 2021-04-20 | 中南大学 | Deformable air nozzle for inhibiting wind-induced vibration of bridge |
| CN111982453A (en) * | 2020-08-04 | 2020-11-24 | 东北林业大学 | Method for controlling extreme value wind pressure of large-span roof by utilizing turbulent flow of ventilation equipment |
| CN114016386B (en) * | 2021-10-15 | 2023-02-28 | 大连理工大学 | Structure or component wind vibration control hollow cover device and design method |
| CN114427187B (en) * | 2022-03-09 | 2023-10-20 | 长沙理工大学 | Intelligent adjustable anti-dazzle plate for inhibiting bridge vortex vibration, control system and method |
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| JPH04198506A (en) * | 1990-11-29 | 1992-07-17 | Nkk Corp | Damping method for aerodynamic vibration of structure |
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| US20080061192A1 (en) * | 2006-09-08 | 2008-03-13 | Steven Sullivan | Method and apparatus for mitigating trailing vortex wakes of lifting or thrust generating bodies |
| CN106049248A (en) * | 2016-06-06 | 2016-10-26 | 汕头大学 | Method for using vertical axial draught fans for conducting vortex vibration control over long-span bridge |
| CN107034780A (en) * | 2017-04-13 | 2017-08-11 | 华北水利水电大学 | A kind of new bridge Vortex-excited vibration control system and its control method |
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Non-Patent Citations (1)
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