CN103938545B - A kind of Self inhaling of suspension cable wind-induced vibration is from blowing vibration absorber - Google Patents
A kind of Self inhaling of suspension cable wind-induced vibration is from blowing vibration absorber Download PDFInfo
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- CN103938545B CN103938545B CN201410169282.8A CN201410169282A CN103938545B CN 103938545 B CN103938545 B CN 103938545B CN 201410169282 A CN201410169282 A CN 201410169282A CN 103938545 B CN103938545 B CN 103938545B
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Abstract
The present invention discloses a kind of Self inhaling of suspension cable wind-induced vibration from blowing vibration absorber, comprise multiple circular hollow collar, multiple circular hollow collar is fastened on suspension cable at regular intervals, the windward side of each circular hollow collar has multiple air inlet, and its leeward side symmetry has multiple venthole.Another this device comprises the spiral hollow collar, and spiral hollow collar tight twist is on suspension cable, and the windward side of the spiral hollow collar has multiple air inlet, and its leeward side symmetry has multiple venthole.The present invention greatly reduces the pressure fluctuation meter on suspension cable surface, significantly reduces the lift on suspension cable surface.Because wake flow cannot form the width that the vortex alternately come off also reduces wake flow to a certain extent, the resistance on suspension cable surface is made to have also been obtained reduction to a certain degree.Change suspension cable surface configuration, the formation of suspension cable surface waterline can be stoped to a certain extent, thus stop the generation of suspension cable rain wind induced vibration.
Description
Technical field
The present invention relates to bridge construction wind vibration control technology, being specifically related to a kind of Self inhaling of suspension cable wind-induced vibration from blowing vibration absorber.
Background technology
Along with the increase of span, its bridge tower size is also increasing.For large-span suspension bridge, a lot of reinforced concrete bridge tower section size can reach 20-30 rice, the scope of charming appearance and behaviour Flow Field can reach several times bridge tower sectional dimension, and the suspension cable therefore near bridge tower both sides is in its flow around bluff bodies field, is vulnerable to the wind-induced inference of bridge tower.Wind can form Flow Field after bridge tower around it, and the frequency of Flow Field fluctuating wind speed can by formula f
v=StU/D obtains, and in formula, St is incoming flow wind speed for square column desirable 0.15, U, and D is the projection of bridge tower in incoming flow vertical direction.Because reinforced concrete bridge tower section size is very large, the fluctuating wind speed frequency of wind after bridge tower reduces greatly, close to former rank natural frequency of suspension cable, makes suspension cable easily amplitude wind-induced vibration occur in bridge tower flow around bluff bodies field.For large-span suspension bridge suspension cable, during typhoon, wind speed is generally at 20-50m/s.In this wind speed section, suspension cable is in bridge tower flow around bluff bodies field and amplitude wind-induced vibration very easily occurs, and easily causes the fatigue damage of suspension cable and the damage of anchor system.When suspension cable is arranged in pairs, also easily there is the mutual collision between paired suspension cable, thus destroy the anticorrosive coat on suspension cable surface, accelerate the corrosion failure process of suspension cable, also can generate a panic to vehicular traffic simultaneously.Inclined Cable Vibration in Longspan Bridge bridge tower flow around bluff bodies field is a new oscillatory type at present, studies its control method, reduces its vibration, has great importance for the design of large span and super-long span bridges, construction, use and man-rate.
At present, the control of suspension cable wind-induced vibration realizes mainly through mechanical devices such as dampers, but result is unsatisfactory, its reason is current damper is not design according to suspension cable multiple modal vibrations, and damper fundamentally can not reduce the wind load of suspension cable, the root of its vibration is not eliminated.If fundamentally wind load can be eliminated, suspension cable is isolated from outside wind field and then can reaches good control effects.
Summary of the invention
The object of the present invention is to provide a kind of Self inhaling of suspension cable wind-induced vibration from blowing vibration absorber.
The technology used in the present invention is as follows:
A kind of Self inhaling of suspension cable wind-induced vibration is from blowing vibration absorber, comprise multiple circular hollow collar, multiple circular hollow collar is fastened on suspension cable at regular intervals, and the windward side of each circular hollow collar has multiple air inlet, and its leeward side symmetry has multiple venthole.
The Self inhaling of another suspension cable wind-induced vibration is from blowing vibration absorber, comprise the spiral hollow collar, spiral hollow collar tight twist is on suspension cable, and the windward side of the spiral hollow collar has multiple air inlet, and its leeward side symmetry has multiple venthole.
A kind of suspension cable bridge, its suspension cable is provided with the Self inhaling of two kinds of suspension cable wind-induced vibrations as above from air blowing vibration absorber or wherein a kind of.
Flow through air inlet enter the collar inside of hollow and spray from venthole through the collar.The air-flow sprayed by leeward side venthole breaks the vortex in wake flow, stops wake flow to form the vortex alternately come off, thus greatly reduces the pressure fluctuation meter on suspension cable surface, significantly reduce the lift on suspension cable surface.Because wake flow cannot form the width that the vortex alternately come off also reduces wake flow to a certain extent, the resistance on suspension cable surface is made to have also been obtained reduction to a certain degree.Meanwhile, the collar combines, and changes suspension cable surface configuration, can stop the formation of suspension cable surface waterline to a certain extent, thus stop the generation of suspension cable rain wind induced vibration.
Accompanying drawing explanation
The circular Self inhaling of Fig. 1 bridge construction suspension cable boasts pneumatic control collar schematic diagram;
Fig. 2 bridge construction stayed-cable screw line Self inhaling boasts pneumatic control collar schematic diagram.
Detailed description of the invention
Below in conjunction with accompanying drawing citing, the invention will be further described.
Embodiment 1
Composition graphs 1, a kind of Self inhaling of suspension cable wind-induced vibration is from blowing vibration absorber, comprise multiple circular hollow collar, multiple circular hollow collar is fastened on suspension cable 1 at regular intervals, the windward side of each circular hollow collar has multiple air inlet 2, and its leeward side symmetry has multiple venthole 3.
Embodiment 2
Composition graphs 2, the Self inhaling of another suspension cable wind-induced vibration is from blowing vibration absorber, and comprise the spiral hollow collar, spiral hollow collar tight twist is on suspension cable 1, the windward side of the spiral hollow collar has multiple air inlet 2, and its leeward side symmetry has multiple venthole 3.
Embodiment 3
Vibration damping workflow is as follows:
(1) by the air-flow that collar venthole sprays, break the vortex alternately produced in wake flow, stop wake vortices to be formed;
(2) collar is arranged on suspension cable surface modification suspension cable format surface, can reduce aerodynamic force suffered by suspension cable.
Bridge construction suspension cable vibration damping protector of the present invention is made up of the vibration damping collar, air inlet and venthole, by the air-flow that collar venthole sprays, break the whirlpool alternately produced in wake flow, wake vortices is stoped to be formed, change suspension cable format surface simultaneously, reduce the aerodynamic force on suspension cable surface to a certain extent.Structure is simple, can reduce the wind-induced vibration of bridge stay cable well.
Claims (3)
1. the Self inhaling of a suspension cable wind-induced vibration is from blowing vibration absorber, it is characterized in that: comprise multiple circular hollow collar, multiple circular hollow collar is fastened on suspension cable at regular intervals, the windward side of each circular hollow collar has multiple air inlet, and its leeward side symmetry has multiple venthole.
2. the Self inhaling of a suspension cable wind-induced vibration is from blowing vibration absorber, it is characterized in that: comprise the spiral hollow collar, spiral hollow collar tight twist is on suspension cable, and the windward side of the spiral hollow collar has multiple air inlet, and its leeward side symmetry has multiple venthole.
3. a suspension cable bridge, is characterized in that: on its suspension cable, be provided with claim 1 or/and the Self inhaling of a kind of suspension cable wind-induced vibration described in 2 is from blowing vibration absorber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410169282.8A CN103938545B (en) | 2014-04-16 | 2014-04-16 | A kind of Self inhaling of suspension cable wind-induced vibration is from blowing vibration absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410169282.8A CN103938545B (en) | 2014-04-16 | 2014-04-16 | A kind of Self inhaling of suspension cable wind-induced vibration is from blowing vibration absorber |
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| Publication Number | Publication Date |
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| CN103938545A CN103938545A (en) | 2014-07-23 |
| CN103938545B true CN103938545B (en) | 2016-01-20 |
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| CN201410169282.8A Active CN103938545B (en) | 2014-04-16 | 2014-04-16 | A kind of Self inhaling of suspension cable wind-induced vibration is from blowing vibration absorber |
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| CN106758816B (en) * | 2017-01-18 | 2018-09-21 | 核工业西南勘察设计研究院有限公司 | Board-like vibration damping sunpender |
| 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 |
| CN108035451A (en) * | 2017-09-28 | 2018-05-15 | 哈尔滨工业大学 | The active inspiration flow control apparatus of cylindrical structural wind-induced vibration |
| CN107740752B (en) * | 2017-11-21 | 2019-02-22 | 北京金风科创风电设备有限公司 | Surround apparatus and method for suppressing vibration of building envelope |
| CN108301325B (en) * | 2018-04-09 | 2024-04-09 | 哈尔滨工业大学 | Non-uniform surface wind-resistant stay cable |
| CN109826095B (en) * | 2019-02-28 | 2020-08-18 | 深圳大学 | Bridge inhaul cable capable of restraining wind and rain excitation |
| CN110863612A (en) * | 2019-12-25 | 2020-03-06 | 苏州中车建设工程有限公司 | Self-suction type suppression device for square column wind-induced vibration |
| CN113279995B (en) * | 2021-04-26 | 2023-01-31 | 交通运输部天津水运工程科学研究所 | Suction-blowing type pneumatic load shedding control system and method for large cylindrical petrochemical storage tank at port |
| CN113882242B (en) * | 2021-11-17 | 2023-03-14 | 哈尔滨工业大学 | Cylindrical structure initiative damping protector that blows based on porous surface of structurization |
| CN114086809B (en) * | 2021-12-02 | 2022-12-27 | 哈尔滨工业大学 | Blunt body wind-induced vibration control device based on structured porous surface active air suction |
| CN114837082B (en) * | 2022-06-07 | 2024-03-26 | 哈尔滨工业大学 | Bridge guy cable structure based on front standing point arrangement feathered bionic structure |
| CN115538284B (en) * | 2022-10-11 | 2023-09-12 | 高速铁路建造技术国家工程研究中心 | Flat box girder active control structure and method based on zero-mass jet flow |
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| CN103938545A (en) | 2014-07-23 |
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