CN107165048A - Damp type drag-line - Google Patents
Damp type drag-line Download PDFInfo
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- CN107165048A CN107165048A CN201710356011.7A CN201710356011A CN107165048A CN 107165048 A CN107165048 A CN 107165048A CN 201710356011 A CN201710356011 A CN 201710356011A CN 107165048 A CN107165048 A CN 107165048A
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- Prior art keywords
- line
- drag
- outer layer
- layer drag
- internal layer
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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
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
- Ropes Or Cables (AREA)
Abstract
The invention provides a kind of damp type drag-line, internal layer drag-line and outer layer drag-line including the different natural frequencies of vibration, the outer layer drag-line is sheathed on outside the internal layer drag-line and both keep relative motions under outer load action, and the wherein natural frequency of vibration of internal layer drag-line and outer layer drag-line is realized by using the ectonexine rope silk or hinge line of different materials, linear mass and stretching force.Filled with damping laminboard layer between the internal layer drag-line and the outer layer drag-line, power consumption is realized by the stretching of damping material, extruding and shearing, and then control the vibration of the outer layer drag-line.The present invention results in the additional damping bigger than common drag-line, and its effectiveness in vibration suppression is good, can efficiently control all kinds of inhaul cable vibrations.Its structural form is simple, good endurance, the manufacture and construction of the structural form drag-line can be achieved on the basis of existing tensioning process, with stronger exploitativeness.
Description
Technical field
The invention belongs to engineering structure vibration control technology field, and in particular to a kind of damp type drag-line.
Background technology
It is well known that drag-line has lightweight, the good characteristic such as high-strength, it is a kind of common engineering material, widely applies
In the space structure such as the civil engineering structures such as cable-stayed bridge, suspension bridge, tower mast structure and net-shape antenna.In science of bridge building field,
Suspension cable is widely used in cable-stayed bridge as main load-carrying member, and it has most important for the security of cable-stayed bridge
Status.However, as a kind of slender member, the lateral stiffness of drag-line is small and itself damping is small, therefore runs lotus in cable-stayed bridge
Load includes easily vibrating under vehicular load, wind load and wind and rain effect.This significantly vibration can cause drag-line mistake
Early fatigue rupture, or the damage of drag-line and Ta Liang coupling parts is caused, these make the public lose the safe confidence to bridge.
At present, the conventional means of pulling cable damping includes：(1) additional mechanical damper vibration damping；(2) aerodynamic countermeasure；
(3) vibration reducing measure is constructed.Wherein：
Pulling cable damping is carried out using additional mechanical damper is a kind of most commonly seen scheme, and many is built up and built
The vibration control means of cable-stayed bridge are considered as this scheme.This class measure is subtracted due to being assisted using external attached equipment
Shake, therefore it is installed and replaced all more convenient.For the cable-stayed bridge of smaller across footpath, its control effect is sufficient, but with
The gradually increase of cable-stayed bridge across footpath, the feasibility of 1400m cable-stayed bridge gets the nod and with certain competitiveness.And damper
Installation often system supported limitation and can be only installed at nearly anchored end, with the increase of guy cable length, its control effect
Limitation is also gradually embodied.
For carrying out pulling cable damping using aerodynamic countermeasure, winding screw line or pressed surface pit are such as used
Approach come destroy wind and rain act on splash line formation and holding, so as to inhibit the generation of wind-rain induced vibration.Same measure, also
Have and change the condition that fluid winding flow time whirlpool rule comes off to a certain extent, so that whirlpool amplitude, which is reduced, certain effect
Really.This class construction measure is embodied in a little its cheap cost, it is easy to implement, and influences small to Mechanical Builds, is economic conjunction
The oscillation damping method of reason；But it can not be applied to all kinds of inhaul cable vibration problems and the explanation and checking of vibration-absorbing mechanism are difficult to, and lack
Few general design criteria, depends on experience and experiment its design and use more.
The overall rope surface construction form of change is included using construction vibration reducing measure and changes single cable structural form two
Individual aspect.The former includes but is not limited to by lazy halyard formation cable net structure.The formation of cable net structure, can effectively improve drawing
The in-plane stiffness of rope, reduces the drift of single cable, so that the natural frequency of drag-line is improved, the load for making it avoid sensitivity
Frequency range.On the other hand, the new mechanism that it can dissipate by the friction effect of junction and there is provided junction energy transmission, from
And obtain the lifting damped to a certain degree.For rope net systematic research, initially due to the complexity of its structural form, scholars
Finite element method is employed to be studied, find the system behavior have it is non-linear；In recent years, related research mainly collects
In in analytic method.Research finds that auxiliary cable system has the mode that overall structure vibrates and Local Members vibrate
Mode, both modalities are densely distributed in less frequency band in " stepped " distribution, and the mode of Local Members vibration.
The control dynamics for the mode that auxiliary cable system vibrates for Local Members are far weaker than the mode vibrated to overall structure
Control effect.Different in view of lazy halyard arrangement in rope net, parameter is various, how to take into account rope face overall appearance effect and
Control effect realizes preferred arrangement, the problem of be still complicated.
Due to the complexity of lazy halyard constructively and the limitation of its control effect so that research focus is increasingly turned to
For in the research of single cable.Mainly consider in drag-line material and cable construction method both direction.The former includes
To carbon fibre reinforcement drag-line, memorial alloy drag-line etc., the research in drag-line material angle, its meaning is more embodied in
Drag-line intensity aspect rather than vibration control aspect.For all kinds of different materials, although there is a certain degree of difference in its damping characteristic
It is different, but effective control is played in the vibration that is often not enough to drag-line of internal damping of its structure so that pass through drag-line material property
It is restricted to obtain effective vibration control this Research Thinking.In the angle of cable construction form, there is scholar to propose
Filled between drag-line noose and cable body under the structural form of visco-elastic damping material, this form, because damping material fails
Occur sufficient displacement to provide enough energy consumption effects so that this structural form is compared to common drag-line, it is impossible to provide more
For effective effectiveness in vibration suppression；Other some scholars' proposition sets cavity in cable body, the collision by strand in cavity to cavity
Come the structural form consumed energy, the structural form can provide sufficient additional damping to stayed structure, but to this structure
The problem of consideration in terms of form, its stability, durability and exploitativeness is still one to be solved.
As can be seen here, the vibration problem of drag-line is to limit the key factor that cable-stayed bridge across footpath further increases, due to
The complexity and limitation of lazy halyard, are examined in deficiency and construction measure of the external bitter end damper in overlength rope control effect
Consider the construction aspect from single cable, propose new-type cable construction form, ensure the basic load function of drag-line
On the basis of being achieved, improve the energy consumption effect of its own to realize effective control of inhaul cable vibration, be one urgently to be resolved hurrily
And the research with extensive engineering significance.
The content of the invention
To overcome the defect present in prior art, a kind of damp type drag-line is now provided, effectively to control Inclined Cable Vibration
The problem of.
To achieve the above object, solution of the invention is：A kind of damp type drag-line, including the different natural frequencies of vibration are provided
Internal layer drag-line and outer layer drag-line, it is outer and occur under load action relative that the outer layer drag-line is sheathed on the internal layer drag-line
Motion.
Preferably, filled with damping laminboard layer between institute's internal layer drag-line and the outer layer drag-line.
Preferably, cut laminboard layer filled with tension and compression between the internal layer drag-line and the outer layer drag-line and then control in described
The Relative Vibration of layer drag-line and the outer layer drag-line.Wherein, construction Energy Dissipation Mechanism is：Difference is respectively adopted in internal layer and outer layer drag-line
The drag-line of material, linear mass, and different stretching forces are imposed, drawn it is possible thereby to obtain the ectonexine with frequency difference
Rope.Due to the difference of the natural frequency of vibration, the difference of the two rope vibration shapes is realized.Under outer load action, by between ectonexine drag-line
Relative displacement is extruded, stretching and shearing damp material, obtains power consumption mechanism, so that realize the control to inhaul cable vibration, wherein
On the premise of performance is met, with the increase of the frequency difference of ectonexine drag-line, the relative motion of two ropes is bigger, to resistance
The stretching of damping material, extruding and shearing are more abundant, and its energy dissipation capacity is more notable.
Preferably, the stretching laminboard layer is visco-elastic damping material.
Preferably, the internal layer drag-line and the outer layer drag-line pass through different rope wire material property, different units
Linear mass and different stretching forces and then to realize the different natural frequencies of vibration.
Preferably, the surface of the internal layer drag-line and the outer layer drag-line is zinc-plated or coats epoxy coating, the outer layer
The outer cover of drag-line is provided with noose, and between the noose and the stretching laminboard layer and outer surface of the internal layer drag-line has
There is overcoat, the overcoat includes high-strength polyester band, HDPE and separation layer.
Preferably, with the increase of both the internal layer drag-line and outer layer drag-line natural frequency of vibration differences, the internal layer
Relative motion between drag-line and the outer layer drag-line is bigger, and then stretching, extruding and the shearing to the damping material are more filled
Point.
Preferably, with the reduction of the damping material rigidity, the phase between the internal layer drag-line and the outer layer drag-line
It is bigger to moving, and then stretching, extruding and the shearing to the damping material are more abundant.
Preferably, the end of the damp type drag-line is provided with steel for wire drawing, the internal layer drag-line and the outer layer drag-line
Extension is anchored in the steel for wire drawing to adapt to different Cable power and section stress.
Preferably, the steel for wire drawing includes the built-in pipe for being connected to the noose, and the end of the built-in pipe is installed with
Locking gear, the internal layer drag-line and the outer layer drag-line spread be anchored on the locking gear respectively.
Preferably, the end of the built-in pipe is provided with anchor slab, and the locking gear is fixedly arranged on the outside of the anchor slab, described
The inner side of anchor slab is provided with sealing drum, and anti-corrosion packing material, the internal layer drag-line are folded between the sealing drum and the anchor slab
And the outer layer drag-line extends through the anti-corrosion packing material.
The beneficial effect of damp type drag-line of the present invention includes：
1) damping laminboard layer is distributed around drag-line, under conditions of reasonable disposition systematic parameter, can obtain sufficient drawing
Rope internal damping come realize in drag-line face and face outside vibration control；
2) limitation of external damper installation site is overcome, the vibration control effect for super long stayed cable is abundant；
3) overcoming external damper needs periodic maintenance and the deficiency replaced, and visco-elastic damping material is located in drag-line
Portion, is difficult to be influenceed by external environment condition such as corrosion factor so that it can ensure its control effect during one's term of military service in drag-line；
4) the vibration control strategy is passive control, it is not necessary to extra energy input, compared to semi- active control and master
Dynamic control strategy has more stable control effect；
5) using along the continuously distributed damping laminboard layer of drag-line, preferably control imitates for each rank inhaul cable vibration mode
Really, with stronger Multi-mode control effect；
6) influence of external damper support system and rope net system to rope face aesthetics construction is overcome；
7) realize that the technological process of the construction is relatively simple.On the basis of most existing tensioning process are retained,
The adjustment made in flow is only needed to can be achieved.
Brief description of the drawings
Fig. 1 is the overall cross section structure diagram of damp type drag-line of the present invention；
Fig. 2 is the cross section structure diagram of radial cross-section in corresponding diagram 1；
Fig. 3 is the cross section structure diagram of axial cross section in corresponding diagram 1；
Fig. 4 is the effectiveness in vibration suppression figure of the damp type drag-line of corresponding diagram 3；
Fig. 5 is the free damping response comparison diagram of drag-line of the present invention and existing common drag-line；
Fig. 6 is damp type stay cable end of the present invention and steel for wire drawing attachment structure schematic diagram；
Fig. 7 is the mplifying structure schematic diagram corresponding to a-quadrant in Fig. 6.
Embodiment
The present invention is further illustrated below in conjunction with accompanying drawing illustrated embodiment.
As shown in Figure 1 to Figure 3, present invention firstly provides a kind of damp type drag-line, drag-line is drawn by internal layer drag-line 1, outer layer
Rope 2, damping laminboard layer 3 and noose 4 are constituted.Wherein, ectonexine drag-line is made up of parallel steel wire, hinge line or other tensile materials.
Ectonexine drag-line is used as overcoat 5 by zinc-plated or epoxy coating, high-strength polyester band, HDPE and separation layer etc..
Fig. 2 and Fig. 3 are scrutinized, specifically, drag-line is divided between internal layer and outer layer drag-line, ectonexine drag-line and fills damping
Material constitutes damping laminboard layer 3.Internal layer and outer layer drag-line impose different stretching forces respectively, it is possible thereby to obtain with self-vibration frequency
The ectonexine drag-line of rate difference.Due to the difference of the natural frequency of vibration, cause the difference of the ectonexine drag-line vibration shape.
As shown in figure 4, under outer load action (now damping material receives tension and compression shearing P), passing through the phase between two ropes
Align in-migration extruding, stretching and shearing damp material, it is considered to the power consumption mechanism of damping material, realize the consumption to inhaul cable vibration energy
Dissipate, so that control effect is played in the vibration to drag-line.
In actual applications, generally, the control effect of inhaul cable vibration can be obtained damping ratios with system
(or logarithmic decrement) is weighed.Below by taking one group of design parameter as an example, logarithm of the examination drag-line under free damping response declines
Lapse rate.And it can be obtained to control effect and make brief analysis to verify its feasibility.
Here the damp type drag-line parameter used is outer layer and internal layer Cable power is respectively：H1=951kN, H2=
211kN；Guy cable length：L=50m；Outer layer and internal layer drag-line linear mass and mass ratio：M1=12.8kg/m, m1/m2=
2；Damp sandwich layer parameter：K=5000N/m, c=850Ns/m.And control effect will be can be obtained under the parameter and common
(parameter is Cable power to drag-line：H=951kN；Guy cable length：L=50m；Linear mass：M=12.8kg/m) progress pair
Than as a result as shown in Figure 5.By calculating, it is known that damp type drag-line results in 8.145% logarithmic decrement, compared to general
1.729% logarithmic decrement of logical drag-line, is obviously improved.
In addition, as shown in fig. 6, the end of the damp type drag-line is provided with steel for wire drawing, the internal layer drag-line 1 and described
Outer layer drag-line 2, which extends, to be anchored in the steel for wire drawing to adapt to different Cable power and section stress.
Specifically, the steel for wire drawing includes the built-in pipe 6 for being connected to the noose, and the end of the built-in pipe 6 is fixed
There is locking gear 10, the internal layer drag-line 1 and the outer layer drag-line 2 spread respectively is anchored on the locking gear 10, described
Internal layer drag-line 1 and the initial extended spot of the outer layer drag-line 2 are provided with cord clip 5.
With reference to shown in Fig. 7, the end of the built-in pipe 6 is provided with anchor slab 9, and the locking gear 10 is fixedly arranged on the anchor slab 9
Outside and provided with protective cover 11, the outer rim of the anchor slab 9 is provided with anchor plate 8, and the inner side of the anchor slab 9 is provided with sealing drum 7, institute
State and anti-corrosion packing material 12 is folded between sealing drum 7 and the anchor slab 9, the internal layer drag-line and outer layer drag-line extension
Through the anti-corrosion packing material 12.
With this, as dotted arrow is illustrated in Fig. 7, the dispersion angle for passing through the 2-in-1 reason of outer layer drag-line is set so that anchor slab 9
Uniform force, each component is mutually balanced.
After above-mentioned implementation process is completed, following characteristics of the present invention should be able to be embodied：
1) the different ectonexine drag-line of frequency and its realization rate (different stretching forces, material and linear mass)；
2) carry out extrusion stretching damping material by the relative motion of ectonexine drag-line, realize power consumption；
3) frequency difference of two ropes is bigger, and relative motion is bigger, the stretching to damping material, and extruding and shearing are more notable,
Vibration control effect is more notable；
The above-mentioned description to embodiment is understood that for ease of those skilled in the art and using this hair
It is bright.Person skilled in the art obviously easily can make various modifications to these embodiments, and described herein
General Principle is applied in other embodiment without passing through performing creative labour.Therefore, the invention is not restricted to above-described embodiment,
Those skilled in the art are according to the announcement of the present invention, and not departing from improvement and modification that scope made all should be in this hair
Within bright protection domain.
Claims (10)
1. a kind of damp type drag-line, it is characterised in that：Internal layer drag-line and outer layer drag-line including the different natural frequencies of vibration, it is described outer
Layer drag-line is sheathed on outside the internal layer drag-line and occurs relative motion under load action.
2. damp type drag-line according to claim 1, it is characterised in that：Between the internal layer drag-line and the outer layer drag-line
Filled with damping laminboard layer.
3. damp type drag-line according to claim 2, it is characterised in that：The damping laminboard layer is viscoelastic damping material
Material.
4. damp type drag-line according to claim 1, it is characterised in that：The internal layer drag-line and the outer layer drag-line are logical
Cross using different rope silks or hinge wire rod matter, different linear mass and different stretching forces so come realize it is different from
Vibration frequency.
5. according to any described damp type drag-line of Claims 1-4, it is characterised in that：The internal layer drag-line and described outer
The surface of layer drag-line is zinc-plated or coats epoxy coating, and the outer cover of the outer layer drag-line is provided with noose, and the noose is drawn with described
Stretch between laminboard layer and the outer surface of the internal layer drag-line be respectively provided with overcoat, the overcoat include high-strength polyester band,
HDPE and separation layer.
6. damp type drag-line according to claim 5, it is characterised in that：With the internal layer drag-line and the outer layer drag-line
The increase of both natural frequency of vibration differences, the relative motion between the internal layer drag-line and the outer layer drag-line is bigger, and then to institute
The stretching, extruding and shearing for stating damping material are more abundant.
7. damp type drag-line according to claim 5, it is characterised in that：With the reduction of the damping material rigidity, institute
The relative motion stated between internal layer drag-line and the outer layer drag-line is bigger, and then stretching to the damping material, extrudes and cut
Cut more abundant.
8. damp type drag-line according to claim 5, it is characterised in that：The end of the damp type drag-line is provided with guy anchor
Head, the internal layer drag-line and the outer layer drag-line, which extend, to be anchored in the steel for wire drawing to adapt to different Cables
Power and section stress.
9. damp type drag-line according to claim 8, it is characterised in that：The steel for wire drawing includes being connected to the noose
Built-in pipe, the end of the built-in pipe is installed with locking gear, and the internal layer drag-line and the outer layer drag-line spread respectively
It is anchored on the locking gear.
10. damp type drag-line according to claim 9, it is characterised in that：The end of the built-in pipe is provided with anchor slab, described
Locking gear is fixedly arranged on the outside of the anchor slab, and the inner side of the anchor slab is provided with sealing drum, the sealing drum and the anchor slab it
Between be folded with anti-corrosion packing material, the internal layer drag-line and the outer layer drag-line extend through the anti-corrosion packing material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710356011.7A CN107165048A (en) | 2017-05-16 | 2017-05-16 | Damp type drag-line |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710356011.7A CN107165048A (en) | 2017-05-16 | 2017-05-16 | Damp type drag-line |
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| Publication Number | Publication Date |
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| CN107165048A true CN107165048A (en) | 2017-09-15 |
Family
ID=59815516
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710356011.7A Pending CN107165048A (en) | 2017-05-16 | 2017-05-16 | Damp type drag-line |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112130599A (en) * | 2020-08-28 | 2020-12-25 | 同济大学 | Cable multi-mode vibration control method considering damper performance frequency dependency |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112130599A (en) * | 2020-08-28 | 2020-12-25 | 同济大学 | Cable multi-mode vibration control method considering damper performance frequency dependency |
| CN112130599B (en) * | 2020-08-28 | 2022-02-25 | 同济大学 | Cable multi-mode vibration control method considering damper performance frequency dependency |
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Application publication date: 20170915 |