CN110158446A - Breathing unit flow control apparatus based on Loads of Long-span Bridges wind field three-dimensional disturbance along span - Google Patents
Breathing unit flow control apparatus based on Loads of Long-span Bridges wind field three-dimensional disturbance along span Download PDFInfo
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- CN110158446A CN110158446A CN201910340246.6A CN201910340246A CN110158446A CN 110158446 A CN110158446 A CN 110158446A CN 201910340246 A CN201910340246 A CN 201910340246A CN 110158446 A CN110158446 A CN 110158446A
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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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Abstract
The invention discloses a kind of breathing unit flow control apparatus based on Loads of Long-span Bridges wind field three-dimensional disturbance along span, described device includes breathing unit pipeline, frequency conversion axial flow fan, rectification honeycomb, in which: breathing unit Pipe installing is in girder bottom close to leading edge and rear two sides sharp corner；Spaced set breathing unit in breathing unit pipeline；Air-breathing air port and air blowing air port is respectively set in the both ends of breathing unit, and inside setting frequency conversion axial flow fan inhales air blowing flow for providing, and setting rectification honeycomb forms uniform flow at air port.The device generates air-breathing in two air ports of pipeline using blower and the control to girder wind-induced vibration is realized in two different effects of blowing, formation and development using breathing unit as disturbing source to inhibit wake flow large scale prospect spape.Breathing unit is set at certain intervals in spanwise direction, stream field carries out three-dimensional disturbance along span control, can effectively inhibit or weaken the generation of vortex-induced vibration, while effective raising girder critical wind speed of flutter.
Description
Technical field
The present invention relates to a kind of Loads of Long-span Bridges girder wind field three-dimensional disturbance along span devices, are able to suppress girder wind-induced vibration.
Background technique
In Loads of Long-span Bridges girder wind-induced vibration, flutter is a kind of diversity vibration, i.e., once occurring to have to make bridge
The danger that girder total collapse destroys；Vortex-induced vibration is a kind of clipping vibration, can cause bridge structure fatigue rupture.Therefore, press down
Loads of Long-span Bridges flutter processed and vortex-induced vibration are the major issue that Structural Wind Engineering field scholars pay close attention to all the time.
It is usually used in controlling the device of girder wind-induced vibration at present including passive control device and two kinds of active control device,
Middle passive control device includes suppression plate, deflector, tuyere, central stabilizer, damper etc., since control form is fixed, no
It can be adjusted as wind regime changes, cause the raising of wind resisting stability that there is biggish limitation, and in some special circumstances
Under can be unfavorable for instead inhibit wind-induced vibration；Active control device includes pneumatic wing plate, active damper etc., but most counting apparatus
Construction is complicated, higher cost, and installation is complicated.
Summary of the invention
In order to overcome the above problem existing for existing control device, the present invention provides a kind of three-dimensional based on Loads of Long-span Bridges wind field
The breathing unit flow control apparatus of disturbance along span.The device is the disturbance device that breathing pattern inhibits wind-induced vibration, using wind
Machine generates air-breathing and two different effects of blowing in two air ports of pipeline, using breathing unit as disturbing source to inhibit tail
The formation and development of large scale prospect spape are flowed, realizes the control to girder wind-induced vibration.It is arranged at certain intervals in spanwise direction
Breathing unit, stream field carry out three-dimensional disturbance along span control, can effectively inhibit or weaken the generation of vortex-induced vibration, have simultaneously
The raising girder critical wind speed of flutter of effect has easy for installation, universality compared with traditional flutter and whirlpool vibration active control device
Preferable advantage and wind resistance effect can be improved in a big way.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of breathing unit flow control apparatus based on Loads of Long-span Bridges wind field three-dimensional disturbance along span, including breathing unit pipeline,
Frequency conversion axial flow fan, rectification honeycomb, in which:
The breathing unit Pipe installing is in girder bottom close to leading edge and rear two sides sharp corner；
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 the breathing unit, and inside setting frequency conversion axial flow fan is for providing
Air blowing flow is inhaled, setting rectification honeycomb forms uniform flow at air port.
Compared with the prior art, the present invention has the advantage that
(1) active control device is used, still can achieve good control effect in biggish wind speed range, and can effectively press down
Two kinds of wind-induced vibrations of flutter processed and vortex-induced vibration.
(2) simple structure for using blower combination pipeline, reduces installation cost.
(3) general ventilation shaft mounting means is used, it is easy for installation.
(4) using three-dimensional disturbance along span method, the control efficiency of wind-induced vibration is effectively increased, control effect is relatively good.
Detailed description of the invention
Fig. 1 is built-in breathing unit pipe arrangement illustration；
Fig. 2 is breathing unit working principle diagram；
Fig. 3 is breathing unit sectional view；
In figure: 1- bottom plane of main girder, 2- breathing unit pipeline, 3- air-breathing air port, 4- air blowing air port, 5- air blowing air-flow, 6- frequency conversion axis
Flow fan, 7- rectify honeycomb, 8- inspiratory airflow.
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 present invention provides a kind of breathing unit flow control apparatus based on Loads of Long-span Bridges wind field three-dimensional disturbance along span, such as
Shown in Fig. 1-3, the breathing unit flow control apparatus includes breathing unit pipeline 2, frequency conversion axial flow fan 6, rectification honeycomb
7, in which:
Spaced set has breathing unit in the breathing unit pipeline 2；
Air-breathing air port 3 and air blowing air port 4 is respectively set in the both ends of the breathing unit, is internally provided with the use of frequency conversion axial flow fan 6
Air blowing flow is inhaled in providing, setting rectification honeycomb 7 forms uniform flow at air port.
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。
(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.
(5) maximum stream flow needed for frequency conversion axial flow fan 6 should be able to provide inhibition wind-induced vibration, the maximum ruler of frequency conversion axial flow fan 6
It is very little identical as 2 inside dimension of breathing unit pipeline, it is connected with, lays cable along 2 interior angle of breathing unit pipeline.
Claims (7)
1. a kind of breathing unit flow control apparatus based on Loads of Long-span Bridges wind field three-dimensional disturbance along span, it is characterised in that the dress
It sets including breathing unit pipeline, frequency conversion axial flow fan, rectification honeycomb, in which:
The breathing unit Pipe installing is in girder bottom close to leading edge and rear two sides sharp corner；
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 the breathing unit, and inside setting frequency conversion axial flow fan is for providing
Air blowing flow is inhaled, setting rectification honeycomb forms uniform flow at air port.
2. the breathing unit flow control apparatus according to claim 1 based on Loads of Long-span Bridges wind field three-dimensional disturbance along span,
It is characterized in that the length of the breathing unit pipeline takes 0.5,For the optimal spacing of disturbance along span.
3. the breathing unit flow control apparatus according to claim 1 based on Loads of Long-span Bridges wind field three-dimensional disturbance along span,
It is characterized in that the breathing unit pipeline section is square with inlet shape.
4. the breathing unit flow control apparatus according to claim 3 based on Loads of Long-span Bridges wind field three-dimensional disturbance along span,
It is characterized in that the square side length is not more than 0.125 times of girder deck-molding.
5. the breathing unit flowing control dress according to claim 1 or 3 based on Loads of Long-span Bridges wind field three-dimensional disturbance along span
It sets, it is characterised in that the breathing unit duct height is not more than 0.125 times of girder height.
6. the breathing unit flow control apparatus according to claim 1 based on Loads of Long-span Bridges wind field three-dimensional disturbance along span,
It is characterized in that the frequency conversion axial flow fan full-size is identical as breathing unit pipeline inside dimension.
7. the breathing unit flowing control dress according to claim 1 or 6 based on Loads of Long-span Bridges wind field three-dimensional disturbance along span
It sets, it is characterised in that the frequency conversion axial flow fan is bolted to inside breathing unit pipeline, along breathing unit pipeline interior angle
Lay cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910340246.6A CN110158446A (en) | 2019-04-25 | 2019-04-25 | Breathing unit flow control apparatus based on Loads of Long-span Bridges wind field three-dimensional disturbance along span |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910340246.6A CN110158446A (en) | 2019-04-25 | 2019-04-25 | Breathing unit flow control apparatus based on Loads of Long-span Bridges wind field three-dimensional disturbance along span |
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| CN110158446A true CN110158446A (en) | 2019-08-23 |
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| CN201910340246.6A Pending CN110158446A (en) | 2019-04-25 | 2019-04-25 | Breathing unit flow control apparatus based on Loads of Long-span Bridges wind field three-dimensional disturbance along span |
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Cited By (2)
| 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 |
| CN112131638A (en) * | 2020-09-09 | 2020-12-25 | 石家庄铁道大学 | Wind-induced dynamic characteristic type determination method of large-span roof structure and terminal equipment |
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| JPH04198506A (en) * | 1990-11-29 | 1992-07-17 | Nkk Corp | Damping method for aerodynamic vibration of structure |
| 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 |
| 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 |
| 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 |
| CN107503281A (en) * | 2017-07-13 | 2017-12-22 | 东北林业大学 | Loads of Long-span Bridges wind-induced vibration flow control method based on vortex generator |
| 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 |
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2019
- 2019-04-25 CN CN201910340246.6A patent/CN110158446A/en active Pending
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| JPH0249805A (en) * | 1988-08-11 | 1990-02-20 | Nkk Corp | Pneumatic oscillation preventing method |
| JPH04198506A (en) * | 1990-11-29 | 1992-07-17 | Nkk Corp | Damping method for aerodynamic vibration of structure |
| 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 |
| 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 |
| 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 |
| CN107503281A (en) * | 2017-07-13 | 2017-12-22 | 东北林业大学 | Loads of Long-span Bridges wind-induced vibration flow control method based on vortex generator |
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| SOON-DUCK KWON: "《Aerodynamic performance of bridges equipped small wind turbines》", 《28TH IMAC CONFERENCE ON STRUCTURAL DYNAMICS 2010 (IMAC-XXVIII)》 * |
Cited By (3)
| 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 |
| CN112131638A (en) * | 2020-09-09 | 2020-12-25 | 石家庄铁道大学 | Wind-induced dynamic characteristic type determination method of large-span roof structure and terminal equipment |
| CN112131638B (en) * | 2020-09-09 | 2022-03-29 | 石家庄铁道大学 | Wind-induced dynamic characteristic type determination method of large-span roof structure and terminal equipment |
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Application publication date: 20190823 |