CN110029572A - Loads of Long-span Bridges flowing control wind resistance method based on breathing unit - Google Patents
Loads of Long-span Bridges flowing control wind resistance method based on breathing unit Download PDFInfo
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- CN110029572A CN110029572A CN201910341033.5A CN201910341033A CN110029572A CN 110029572 A CN110029572 A CN 110029572A CN 201910341033 A CN201910341033 A CN 201910341033A CN 110029572 A CN110029572 A CN 110029572A
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- breathing unit
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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
- E01D19/00—Structural or constructional details of bridges
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/04—Bearings; Hinges
- E01D19/042—Mechanical bearings
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The Loads of Long-span Bridges flowing control wind resistance method based on breathing unit that the invention discloses a kind of, described method includes following steps: step 1: installing breathing unit pipeline close to leading edge and rear two sides sharp corner in girder bottom, spaced set breathing unit in the breathing unit pipeline, air-breathing air port and air blowing air port is respectively set in the both ends of breathing unit, frequency conversion axial flow fan is arranged in inside, setting rectification honeycomb at air port；Step 2: generating air-breathing and two different effects of blowing in the air-breathing air port of breathing unit pipeline and air blowing air port using frequency conversion axial flow fan, using breathing unit as the disturbing source of girder Flow Field, inhibit the development of wake flow large scale prospect spape, excite fair current to whirlpool, and then secondary wake flow unstability is excited, realize the control to girder wind-induced vibration.The present invention using breathing unit as disturbance device improve bridge main beam flow-disturbing field structure, thus achieve the purpose that inhibit girder wind shake, have many advantages, such as efficiently, simply, have a wide range of application.
Description
Technical field
The invention belongs to technical field of civil engineering, are related to a kind of Loads of Long-span Bridges flowing control wind resistance method.
Background technique
With the progress of material and the improvement of construction method, modern bridge across, light, soft direction to developing greatly, the rigidity of structure
With damping constantly reduce, bridge charming appearance and behaviour vibration problem is more and more prominent, flutter, buffeting, vortex-induced vibration etc. typical case charming appearance and behaviour effect by
Gradually become key factor in need of consideration in Loads of Long-span Bridges design.In Loads of Long-span Bridges girder wind-induced vibration, flutter is a kind of hair
Property vibration is dissipated, i.e., once occurring that will there is the danger for destroying bridge main beam total collapse；Vortex-induced vibration is a kind of clipping vibration,
It can cause bridge structure fatigue rupture.Therefore, inhibit Loads of Long-span Bridges flutter and vortex-induced vibration is Structural Wind Engineering neck all the time
The major issue that domain scholars pay close attention to.
In general, the aerodynamic Measures of Loads of Long-span Bridges wind dynamic control include active control and passive control.Passive mode is to pass through
Change the aerodynamic configuration of bridge main beam section or increases accessory structure to improve Loads of Long-span Bridges wind loading rating.Since which is simple
Economy is widely used in Practical Project, including radome fairing, deflector, spoiler, central stabilizer, central slot,
Wing flap, tuyere etc..But it is typically only capable to improve girder aerodynamic configuration within limits, and is also required to before the use a large amount of
Experiment and simulation go to verify validity although the research of the passive mode about pneumatic control has been carried out very much
The control method analyzed and proposed based on two-dimentional Bridge Sections flow field, not only use condition is limited for such methods, Er Qiexu
Cost is undoubtedly considerably increased along the elongated setting control device of girder spanwise direction.Active control is to utilize actively energy supply
Mode directly improves bridge around laminar boundary layer and then improves the research of Wind-resistance of Bridges ability.Currently used active control is pneumatic
Shape measure includes pneumatic wing plate and steady suction air method.Pneumatic wing plate is a kind of energy by girder input system, Neng Gouyou
The method that effect dissipation air-flow is improved to the flutter stability of system.Steady suction air is a kind of active suppression flow around body side
The effective technology means of interlayer separation, can effectively improve Flutter Stability for Bridge, stability with the increase of air-breathing energy and
It improves, but excessive air-breathing energy will be such that flutter stability reduces.Aforesaid way all has that control efficiency is low, and control range is small,
The larger problem of limitation.
Summary of the invention
In order to improve the efficiency of control wind-induced vibration, the present invention is based on the unstability of Blunt wake prospect spape and utilization is exhaled
Unit is inhaled as disturbance device, provides a kind of Loads of Long-span Bridges flowing control wind resistance method based on breathing unit.Of the invention
Method is that a kind of novel three-dimensional is opened up to flow-disturbing Active Control Method, improves bridge main beam as disturbance device using breathing unit and disturbs
Flow field structure, thus achieve the purpose that inhibit girder wind shake, the control method have many advantages, such as efficiently, simply, have a wide range of application.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of Loads of Long-span Bridges flowing control wind resistance method based on breathing unit, includes the following steps:
Step 1: breathing unit pipeline, the breathing unit pipe are installed close to leading edge and rear two sides sharp corner in girder bottom
Air-breathing air port and air blowing air port, inside setting frequency conversion is respectively set in spaced set breathing unit in road, the both ends of breathing unit
Axial flow blower inhales air blowing flow for providing, and setting rectification honeycomb forms uniform flow at air port；
Step 2: generating air-breathing and air blowing two in the air-breathing air port of breathing unit pipeline and air blowing air port using frequency conversion axial flow fan
The different effect of kind inhibits the development of wake flow large scale prospect spape, excitation using breathing unit as the disturbing source of girder Flow Field
Fair current excites secondary wake flow unstability to whirlpool, realizes the control to girder wind-induced vibration.
Compared with the prior art, the present invention has the advantage that
1, the present invention can play the role of inhibiting wind-induced vibration in biggish wind speed range by adjusting respiratory flow.
2, the present invention utilizes Blunt wake prospect spape unstability, and girder flutter and whirlpool vibration stability can be improved.
3, breathing unit is the disturbance device of breathing pattern, generates air-breathing and air blowing in two air ports of pipeline using blower
Two different effects, the development using breathing unit as disturbing source to inhibit wake flow large scale prospect spape, excitation fair current to
Whirlpool, and then realize the control to girder wind-induced vibration.
Detailed description of the invention
Fig. 1 is breathing unit pipe arrangement illustration；
Fig. 2 is three disturbance along span flow control principle figures of breathing unit；
In figure: 1- bottom plane of main girder, 2- breathing unit pipeline, 3- air-breathing air port, 4- air blowing air port, 5- prospect spape structure, 6- are three-dimensional
The optimal spacing of disturbance along span, 7- incoming flow wind.
Specific embodiment
Further description of the technical solution of the present invention with reference to the accompanying drawing, and however, it is not limited to this, all to this
Inventive technique scheme is modified or replaced equivalently, and without departing from the spirit and scope of the technical solution of the present invention, should all be covered
Within the protection scope of the present invention.
The Loads of Long-span Bridges flowing control wind resistance method based on breathing unit that the present invention provides a kind of, as shown in Figs. 1-2, institute
Method is stated using three-dimensional disturbance along span, the unstability of Blunt wake prospect spape is excited, inhibits the hair of wake flow large scale prospect spape
Exhibition, excitation fair current realize the control to girder wind-induced vibration to whirlpool.
Due to Bridge Sections difference, the wind field characteristic under incoming flow effect is not also identical, therefore breathing unit preferably basis
Depending on concrete condition, but following principle should be followed:
(1) according to local wind regime combination bridge form of fracture, according to wind tunnel test obtain as a result, selection disturbance along span optimal
Away from.And the length of breathing unit pipeline 2 should take 0.5 times。Best value be between 2 to 3 times of girder deck-moldings.
(2) 2 installation site of breathing unit pipeline is main beam bottom portion close to leading edge and rear two sides sharp corner, both can be upper
Flow separation is slowed down in trip area, and can inspire fair current to whirlpool to inhibit wind-induced vibration in downstream.
(3) 2 section of breathing unit pipeline is square with inlet shape, what side length should be actually obtained with wind tunnel test combination
As a result, required maximum air flow amount and wind speed is taken to determine that side length is not more than 0.125 times of girder deck-molding.
(4) 2 height of breathing unit pipeline is not more than 0.125 times of girder height, and flow should be tried according to local wind regime and wind-tunnel
It tests result and takes optimal result.
Claims (7)
1. a kind of Loads of Long-span Bridges flowing control wind resistance method based on breathing unit, it is characterised in that the method includes walking as follows
It is rapid:
Step 1: breathing unit pipeline, the breathing unit pipe are installed close to leading edge and rear two sides sharp corner in girder bottom
Air-breathing air port and air blowing air port, inside setting frequency conversion is respectively set in spaced set breathing unit in road, the both ends of breathing unit
Axial flow blower inhales air blowing flow for providing, and setting rectification honeycomb forms uniform flow at air port；
Step 2: generating air-breathing and air blowing two in the air-breathing air port of breathing unit pipeline and air blowing air port using frequency conversion axial flow fan
The different effect of kind inhibits the development of wake flow large scale prospect spape, excitation using breathing unit as the disturbing source of girder Flow Field
Fair current excites secondary wake flow unstability to whirlpool, realizes the control to girder wind-induced vibration.
2. the Loads of Long-span Bridges flowing control wind resistance method according to claim 1 based on breathing unit, it is characterised in that institute
The length for stating breathing unit pipeline takes 0.5,For the optimal spacing of disturbance along span.
3. the Loads of Long-span Bridges flowing control wind resistance method according to claim 2 based on breathing unit, it is characterised in that institute
It statesBest value be between 2 to 3 times of girder deck-moldings.
4. the Loads of Long-span Bridges flowing control wind resistance method according to claim 1 based on breathing unit, it is characterised in that institute
Breathing unit pipeline section is stated to be square with inlet shape.
5. the Loads of Long-span Bridges flowing control wind resistance method according to claim 4 based on breathing unit, it is characterised in that institute
Square side length is stated no more than 0.125 times of girder deck-molding.
6. the Loads of Long-span Bridges flowing control wind resistance method according to claim 1 or 4 based on breathing unit, it is characterised in that
The breathing unit duct height is not more than 0.125 times of girder height.
7. the Loads of Long-span Bridges flowing control wind resistance method according to claim 1 based on breathing unit, it is characterised in that institute
It is identical as breathing unit pipeline inside dimension to state frequency conversion axial flow fan full-size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910341033.5A CN110029572A (en) | 2019-04-25 | 2019-04-25 | Loads of Long-span Bridges flowing control wind resistance method based on breathing unit |
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| CN201910341033.5A CN110029572A (en) | 2019-04-25 | 2019-04-25 | Loads of Long-span Bridges flowing control wind resistance method based on breathing unit |
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| CN110029572A true CN110029572A (en) | 2019-07-19 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112015107A (en) * | 2020-07-30 | 2020-12-01 | 长沙理工大学 | Active suction-based multi-order vortex vibration intelligent control system and method for large-span bridge |
| CN113235398A (en) * | 2021-06-02 | 2021-08-10 | 哈尔滨工业大学 | Active air suction and blowing intelligent control device for wind-induced vibration of single box girder of long-span bridge girder |
| CN113358322A (en) * | 2021-06-03 | 2021-09-07 | 长沙理工大学 | Wind tunnel simulation device |
| CN113358310A (en) * | 2021-06-03 | 2021-09-07 | 长沙理工大学 | Vortex vibration testing device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04198506A (en) * | 1990-11-29 | 1992-07-17 | Nkk Corp | Damping method for aerodynamic vibration of structure |
| JP2001193013A (en) * | 2000-01-11 | 2001-07-17 | Nkk Corp | Edge box girder bridge |
| CN101892625A (en) * | 2010-07-23 | 2010-11-24 | 同济大学 | Wind fin plate for improving pneumatic performance of bridge |
| CN203768813U (en) * | 2014-04-16 | 2014-08-13 | 哈尔滨工业大学 | Self-suction and self-gas-blowing damping device with stay cable wind-induced vibration |
| CN105388926A (en) * | 2015-11-12 | 2016-03-09 | 东南大学 | Air blowing method for controlling vortex-induced vibration of large-span bridge steel box girder |
| CN107090768A (en) * | 2017-06-15 | 2017-08-25 | 哈尔滨工业大学 | Bridge structure box girder Self inhaling is from blowing vibration absorber |
| CN107765722A (en) * | 2017-09-28 | 2018-03-06 | 哈尔滨工业大学 | Longspan Bridge steel box-girder flutter active air blowing flow control apparatus |
| CN108560400A (en) * | 2018-03-29 | 2018-09-21 | 哈尔滨工业大学 | Longspan Bridge box beam flow system based on active blowing suction technology |
-
2019
- 2019-04-25 CN CN201910341033.5A patent/CN110029572A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04198506A (en) * | 1990-11-29 | 1992-07-17 | Nkk Corp | Damping method for aerodynamic vibration of structure |
| JP2001193013A (en) * | 2000-01-11 | 2001-07-17 | Nkk Corp | Edge box girder bridge |
| CN101892625A (en) * | 2010-07-23 | 2010-11-24 | 同济大学 | Wind fin plate for improving pneumatic performance of bridge |
| CN203768813U (en) * | 2014-04-16 | 2014-08-13 | 哈尔滨工业大学 | Self-suction and self-gas-blowing damping device with stay cable wind-induced vibration |
| CN105388926A (en) * | 2015-11-12 | 2016-03-09 | 东南大学 | Air blowing method for controlling vortex-induced vibration of large-span bridge steel box girder |
| CN107090768A (en) * | 2017-06-15 | 2017-08-25 | 哈尔滨工业大学 | Bridge structure box girder Self inhaling is from blowing vibration absorber |
| CN107765722A (en) * | 2017-09-28 | 2018-03-06 | 哈尔滨工业大学 | Longspan Bridge steel box-girder flutter active air blowing flow control apparatus |
| CN108560400A (en) * | 2018-03-29 | 2018-09-21 | 哈尔滨工业大学 | Longspan Bridge box beam flow system based on active blowing suction technology |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112015107A (en) * | 2020-07-30 | 2020-12-01 | 长沙理工大学 | Active suction-based multi-order vortex vibration intelligent control system and method for large-span bridge |
| CN112015107B (en) * | 2020-07-30 | 2021-07-02 | 长沙理工大学 | Active suction-based multi-order vortex vibration intelligent control system and method for large-span bridge |
| CN113235398A (en) * | 2021-06-02 | 2021-08-10 | 哈尔滨工业大学 | Active air suction and blowing intelligent control device for wind-induced vibration of single box girder of long-span bridge girder |
| CN113358322A (en) * | 2021-06-03 | 2021-09-07 | 长沙理工大学 | Wind tunnel simulation device |
| CN113358310A (en) * | 2021-06-03 | 2021-09-07 | 长沙理工大学 | Vortex vibration testing device |
| CN113358322B (en) * | 2021-06-03 | 2022-05-06 | 长沙理工大学 | Wind tunnel simulation device |
| CN113358310B (en) * | 2021-06-03 | 2022-07-29 | 长沙理工大学 | Vortex vibration testing device |
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Application publication date: 20190719 |