CN101613988A - Vibration reduction and limiting device for stay cable - Google Patents
Vibration reduction and limiting device for stay cable Download PDFInfo
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- CN101613988A CN101613988A CN200910069699A CN200910069699A CN101613988A CN 101613988 A CN101613988 A CN 101613988A CN 200910069699 A CN200910069699 A CN 200910069699A CN 200910069699 A CN200910069699 A CN 200910069699A CN 101613988 A CN101613988 A CN 101613988A
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Abstract
The invention discloses a kind of vibration reduction and limiting device for stay cable, comprise the base plate affixed with bridge floor, be connected with coaxial inverted inside and outside support tube on the described base plate, spacing is 3.2～3.6cm at the bottom of the described inside and outside support tube tube, be provided with the edge of a wing of movably being inverted T type post between at the bottom of the described inside and outside support tube tube, it is affixed that the web of described T type post extends the tube end and the anchor ear of outer support tube, and described anchor ear and described suspension cable are affixed.The present invention (one) is to the damping effect of rain wind induced vibration: after this stopping means was installed, the peak swing of drag-line had had obviously and has reduced, and reduced to originally about 1/4～1/5, illustrated that this stopping means has the obvious suppression effect to the rain wind induced vibration of drag-line; (2) to the damping effect of parameter resonance: after this stopping means was installed, the peak swing of drag-line had had obviously and has reduced, and reduced to originally about 1/10, illustrated that this stopping means has the obvious suppression effect to the significantly parameter resonance of drag-line.Be particularly useful for low-pylon cable-stayed bridge.
Description
Technical field
The present invention relates to the bridge engineering field, relate in particular to a kind of pulling cable damping stopping means of cable stayed bridge.
Background technology
Drag-line is the key member of cable stayed bridge, considers the flexibility of drag-line, less relatively quality and lower damping, very easily vibrates at mobile load effect downhauls such as wind load, wind and rain acting in conjunction and vehicular loads.Inhaul cable vibration can be divided into two big classes: wind-induced vibration and non-wind-induced vibration.Wind-induced vibration comprises that the whirlpool swashs resonance, wake flow galloping, galloping, rain wind induced vibration etc.; Non-wind-induced vibration mainly refers to parametric vibration and internal resonance.The significantly vibration of drag-line causes the fatigue of anchored end easily, perhaps damages the anti-corrosion system of stay cable end, shortens the application life of drag-line, when serious even want urgent close traffic.Inhaul cable vibration has become one of anxious key issue to be solved of long span stayed-cable bridge, has caused that also Chinese scholars more and more pays close attention to.Through 20 years of researches, people are the mechanism of Preliminary study inhaul cable vibration, has also proposed in actual engineering and adopted a lot of effectively pulling cable damping measures, has obtained tangible effectiveness in vibration suppression.Existing vibration reducing measure has: aerodynamics measure, structural measure and mechanical damping measure.(1) aerodynamics measure: it all is that the change of fluidised form generating period encourages drag-line and causes during owing to the airflow passes drag-line that the rain wind induced vibration of drag-line, whirlpool swash resonance etc.Aerodynamic Measures is exactly the aerodynamic characteristic that changes drag-line by the configuration of surface of form of fracture that changes drag-line or drag-line, no longer causes the vibration of drag-line when making the airflow passes drag-line.This is very effective to the rain wind induced vibration that suppresses drag-line, to suppressing vortex-induced vibration certain effect is arranged also.The aerodynamics vibration reducing measure is not owing to there is a complete theoretical foundation, and present design, construction can only rely on the conclusion of existing experience and test gained, and the effectiveness in vibration suppression difficulty of wanting to reach desirable is bigger.(2) structural measure: proved that at present effective structural measure mainly is the lazy halyard method.Be about to multiple skew cables and transversely link, perhaps mutual two drag-lines arranged side by side are coupled together, reach the purpose that suppresses inhaul cable vibration with connector.After guest rope connects drag-line, each drag-line can not vibrate separately again, and the vibration of any single order formation all can make every drag-line vibrating more or less.Iff in part drag-line effect dynamic air power or self-excited vibration power, owing to the connection of lazy halyard, relative mass becomes big (meaning that relative external force diminishes), can suppress vibration.When being connected of guest rope and drag-line is very firm, can produce very big internal force and strain in the guest rope, because the hysteresis dissipation of energy, the damping of drag-line---guest rope system can improve, this point is verified on real bridge.Guest rope can increase rigidity in the drag-line face, and the low order frequency of main rope is improved, but the increase effect of frequency is very limited during only with a guest rope.The shortcoming of lazy halyard method is to have destroyed the view of original rope face; The lazy halyard design is complicated, and difficulty is installed.Therefore the designer tends to not adopt this method as far as possible at present.(3) mechanical vibration reducing measure: near the suitable position (normally the guy anchor fixed end) at drag-line is installed various forms of dampers, the modal damping that can the improve drag-line vibrational energy of drag-line that dissipates.The damper method is a kind of " widely " vibration reducing measure, and various inhaul cable vibrations are all had the favorable damping effect.Can be divided into high-damping rubber shock absorber, oil damper, sticky shearing type damper, MR intelligent damper (MR damper), frcition damper etc. according to damper material therefor difference.(1) high-damping rubber damper (High Damping RubberDamper) utilizes the shear strain viscous damping power consumption of friction between rubber and the drag-line and rubber self.High-damping rubber had both had elastic solid (Hookean body) character, showed the viscous fluid characteristic again.Elastic deformation takes place in elastic solid (Hookean body) under external force, produces potential energy and dissipation energy not, and viscous fluid irreversible stickiness takes place under external force flows, and produces heat energy and dissipation energy.Because viscoelastic material has the two characteristic concurrently, so be widely used in engineering.The available damping of high-damping rubber circle is limited, thereby effectiveness in vibration suppression is not very desirable.Adopting high-damping rubber circle and other dampers to unite and using is a developing direction, but their placement location and compound mode also need to do further research.(2) initial oil damper (Oil Damper) adopts vehicle shock absorbers more, because shock absorber for vehicle is an oil hydraulic type, a general drag-line can only provide axial damping force, so in order to control the elliptic vibration of suspension cable, need adopt two dampers to control in the face of drag-line and out-of-plane vibration.The subject matter of oil damper is its mechanical realization complexity, and is insensitive to microvibration, makes its installation regulate cumbersome.Because the oil damper resisting medium is a liquid, and leakage of oil and oil impregnate phenomenon easily take place, its maintenance cost is higher relatively.(3) stickiness shearing type damper (Viscous Shear Damper) is the vibration that the resistance of utilizing the shear strain of sticky stuff to produce suppresses drag-line.A stickiness shearing type damper can be controlled in the drag-line face simultaneously, the vibration of the outer both direction of face, and the variation of traceable damper installation site of being brought by the axially-movable of drag-line.Its construction features produce shear strain for the motion by the damper built-in inserted plate makes sticky stuff, thereby the vibrational energy of drag-line is passed to sticky stuff.Stickiness shearing type damper simple structure, machining require low, can obtain required viscous damping coefficient at an easy rate by the area of adjusting plate and the injection rate of sticky stuff.Sticky stuff mostly is macromolecular compound, and its performance will determine the result of use of stickiness shearing type damper.Because the damping characteristic and the stiffness characteristics of sticky stuff are very high to the sensitiveness of temperature, so the effectiveness in vibration suppression of stickiness shearing type damper is subjected to Temperature Influence bigger.(4) magnetomechanical damping device: (Magnetic force Damper) only tentatively is applied to the sky in Japan at present and builds on the bridge of temple, and this bridge is the PC cable stayed bridge of main span 219m.Its principle is: drag-line vibrates, and the sorption plate on it will be by sorption, when the lateral movement power of rope surpasses sorptive force during near magnetite, both separate again, sorption with separate the vibration characteristics that will change drag-line, cause the transmission and the consumption of energy between the different vibration shapes, reach the purpose of vibration damping.The characteristics of magnetomechanical damping device are because resisting medium is not a liquid, and are good to the environmental adaptability above three kinds of dampers that compare.Especially commendable is, and its cold tolerance is fine, applicable to severe cold area.Its simple structure, cost, maintenance cost are all lower.(5) MR intelligent damper: (Magneto-Rheological Damper) is a kind of semi-automatic control device, is to be the adjustable parameter damper of driving material with intellectual material (magnetorheological materials).The two-phase magnetic flow liquid is a kind of controllable liquid, and it is the suspension made from nonconducting mother liquor and uniformly dispersing solid magnetic particle therein.Under the effect of magnetic field, solid particle in the rheology liquid just forms the chain of a branch of bundle fiber shape, crossbearer is between the two poles of the earth in magnetic field, like this, for the shearing force that is parallel to electrode, magnetic rheology effect will take place in rheology liquid under the effect in magnetic field, promptly the Newtonian fluid with certain viscosity from good fluidity changes the glutinous plastomer with certain yield force into, thereby reaches effectiveness in vibration suppression.Electro-rheological fluid damper is compared with MR damper, and required applied voltage is much higher, will implement certain difficulty up to hundreds of volts usually.The advantage of MR damper is: be subjected to such environmental effects such as temperature little, the size of damped coefficient can be adjusted by regulating input voltage, thereby makes the damping force of every drag-line reach optimum state, obtains good damping effect.The shortcoming of MR damper is: control has only the relative velocity that produces between damper by input current or voltage, change damper magnetic field intensity and passive dependency structure vibration to realize.(6) friction-type damper (Friction Damper) is to utilize friction to consume the energy of inhaul cable vibration, thereby reaches the effect of vibration damping.The friction-type damper of exploitation has following characteristics at present: frictional force is adjustable; Be easy to install; After installing, damping force is a constant, not with vibration velocity and frequency change; The characteristic of damper is insensitive to the axial tension of drag-line under different stresses; The damper individuality is less, does not influence view; Owing to have stiction, so this damper is insensitive to the micro breadth oscillation of drag-line.The shortcoming of friction-type damper is: because all multifactor restrictions, it can not place from bridge floor too high, so effectiveness in vibration suppression is greatly limited.
In sum, these vibration reducing measures all have tangible deficiency, and the researcher still needs effort, set up the theoretical model of more accurate inhaul cable vibration control, propose the more scientific design method of inhaul cable vibration control, study more effective control measure.
Summary of the invention
Purpose of the present invention in order to overcome above-mentioned deficiency of the prior art, provides a kind of vibration reduction and limiting device for stay cable just, this stopping means simple structure, and applied widely, effectiveness in vibration suppression is obvious, and temperature influence is little, and cost and maintenance cost are all lower.
The technical scheme that the present invention takes for the technical problem that exists in the solution known technology is: a kind of vibration reduction and limiting device for stay cable, comprise the base plate affixed with bridge floor, be connected with coaxial inverted inside and outside support tube on the described base plate, spacing 3.2～3.6cm at the bottom of the described inside and outside support tube tube, be provided with the T type post at the bottom of described outer support tube tube is extended in inversion between at the bottom of the described inside and outside support tube tube, described T type post and anchor ear are affixed, and described anchor ear and suspension cable are affixed.
The invention has the beneficial effects as follows: (one) is to the damping effect of rain wind induced vibration: after this stopping means is installed, the peak swing of drag-line has had obviously and has reduced, reduce to originally about 1/4～1/5, illustrate that this stopping means has the obvious suppression effect to the rain wind induced vibration of drag-line; (2) to the damping effect of parameter resonance: after this stopping means was installed, the peak swing of drag-line had had obviously and has reduced, and reduced to originally about 1/10, illustrated that this stopping means has the obvious suppression effect to the significantly parameter resonance of drag-line.Be particularly useful for low-pylon cable-stayed bridge.
Description of drawings
Fig. 1 is a Facad structure schematic diagram of the present invention;
Fig. 2 is a side structure schematic diagram of the present invention.
Reference numeral: 1, base plate, 2, interior support tube, 3, outer support tube, 4, T type post, 5, anchor ear, 6, suspension cable.
The specific embodiment
Below in conjunction with drawings and Examples the present invention is further described:
Embodiment 1:
A kind of vibration reduction and limiting device for stay cable, comprise the base plate 1 affixed with bridge floor, be connected with coaxial inverted inside and outside support tube 2,3 on the base plate 1, spacing 3.2cm at the bottom of the inside and outside support tube tube, be provided with between at the bottom of the inside and outside support tube tube and be inverted the T type post 4 that extends at the bottom of 3 of the outer support tubes, the edge of a wing of T type post 4 can move up and down between at the bottom of the inside and outside support tube tube between at the bottom of the inside and outside support tube tube, the web and the anchor ear 5 of T type post 4 are affixed, and anchor ear 5 is affixed with suspension cable 6.
Choose case history, the suspension cable parameter is: suspension cable length L=107.66m, design Suo Li T=3162kN, suspension cable line density ρ
m=81.167kg/m, suspension cable diameter D=0.09m.
The 10m place installs above-mentioned vibration reduction and limiting device additional in distance suspension cable bottom.1cm is got in spacing gap, that is: spacing is 1cm at the bottom of the edge of a wing of inverted T type post and the inverted inside and outside support tube tube, and at this moment, the edge of a wing thickness of T type post is 1.2cm.
After above-mentioned vibration reduction and limiting device was installed, the peak swing of suspension cable had had obviously and has reduced, and reduced to originally about 1/10, illustrated that stopping means has the obvious suppression effect to the significantly parameter resonance of drag-line.
Embodiment 2:
A kind of vibration reduction and limiting device for stay cable, comprise the base plate 1 affixed with bridge floor, be connected with coaxial inverted inside and outside support tube 2,3 on the base plate 1, spacing 3.6cm at the bottom of the inside and outside support tube tube, be provided with between at the bottom of the inside and outside support tube tube and be inverted the T type post 4 that extends at the bottom of 3 of the outer support tubes, the edge of a wing of T type post 4 can move up and down between at the bottom of the inside and outside support tube tube between at the bottom of the inside and outside support tube tube, the web and the anchor ear 5 of T type post 4 are affixed, and anchor ear 5 is affixed with suspension cable 6.
With certain suspension cable is that example is analyzed.Suspension cable length L=330.4m, design Suo Li T=6403kN, suspension cable line density ρ
m=81.167kg/m, section area A=0.0102m
2, suspension cable diameter D=0.12m.
The 33m place installs above-mentioned vibration reduction and limiting device additional in distance suspension cable bottom.1cm is got in spacing gap, that is: spacing is 1cm at the bottom of the edge of a wing of inverted T type post and the inverted inside and outside support tube tube, and at this moment, the edge of a wing thickness of T type post is 1.6cm.
After above-mentioned vibration reduction and limiting device was installed, the peak swing of suspension cable had had obviously and has reduced, and reduced to originally about 1/4～1/5, illustrated that stopping means has the obvious suppression effect to the rain wind induced vibration of drag-line.
Although in conjunction with the accompanying drawings the preferred embodiments of the present invention are described above; but the present invention is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment only is schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not breaking away under the scope situation that aim of the present invention and claim protect, can also make a lot of forms, these all belong within protection scope of the present invention.
Claims (1)
1. vibration reduction and limiting device for stay cable, it is characterized in that, comprise the base plate affixed with bridge floor, be connected with coaxial inverted inside and outside support tube on the described base plate, spacing is 3.2～3.6cm at the bottom of the described inside and outside support tube tube, be provided with the edge of a wing of movably being inverted T type post between at the bottom of the described inside and outside support tube tube, it is affixed that the web of described T type post extends an end and the anchor ear of outer support tube, and described anchor ear and described suspension cable are affixed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100696996A CN101613988B (en) | 2009-07-10 | 2009-07-10 | Vibration reduction and limiting device for stay cable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100696996A CN101613988B (en) | 2009-07-10 | 2009-07-10 | Vibration reduction and limiting device for stay cable |
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| CN101613988A true CN101613988A (en) | 2009-12-30 |
| CN101613988B CN101613988B (en) | 2011-05-25 |
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| CN2009100696996A Expired - Fee Related CN101613988B (en) | 2009-07-10 | 2009-07-10 | Vibration reduction and limiting device for stay cable |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102561184A (en) * | 2011-12-30 | 2012-07-11 | 中铁大桥局集团武汉桥梁科学研究院有限公司 | Vertical shock absorption device with external stayed cable |
| CN108052766A (en) * | 2017-12-27 | 2018-05-18 | 武汉光谷北斗控股集团有限公司 | A kind of double rope spacing and icing influence research method to double rope wake gallopings |
| CN111963618A (en) * | 2020-07-21 | 2020-11-20 | 同济大学 | Inhaul cable multi-order modal vibration control method based on double dampers |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1327084C (en) * | 2004-12-07 | 2007-07-18 | 清华大学 | Stayed cable shock attenuation device |
| CN201031357Y (en) * | 2007-02-27 | 2008-03-05 | 宁波杉工结构监测与控制工程中心有限公司 | Stayd-cable bridge backstay cable uniaxial two-dimension shock-absorbing device |
| CN101324052A (en) * | 2007-06-12 | 2008-12-17 | 同济大学 | Damper gain apparatus |
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2009
- 2009-07-10 CN CN2009100696996A patent/CN101613988B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102561184A (en) * | 2011-12-30 | 2012-07-11 | 中铁大桥局集团武汉桥梁科学研究院有限公司 | Vertical shock absorption device with external stayed cable |
| CN102561184B (en) * | 2011-12-30 | 2014-10-29 | 中铁大桥局集团武汉桥梁科学研究院有限公司 | Vertical shock absorption device with external stayed cable |
| CN108052766A (en) * | 2017-12-27 | 2018-05-18 | 武汉光谷北斗控股集团有限公司 | A kind of double rope spacing and icing influence research method to double rope wake gallopings |
| CN111963618A (en) * | 2020-07-21 | 2020-11-20 | 同济大学 | Inhaul cable multi-order modal vibration control method based on double dampers |
| CN111963618B (en) * | 2020-07-21 | 2021-11-09 | 同济大学 | Inhaul cable multi-order modal vibration control method based on double dampers |
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| CN101613988B (en) | 2011-05-25 |
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Granted publication date: 20110525 Termination date: 20120710 |