CN205501801U - A friction damper that restores to throne certainly for beam bridge shock isolation system - Google Patents
A friction damper that restores to throne certainly for beam bridge shock isolation system Download PDFInfo
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- CN205501801U CN205501801U CN201620301957.4U CN201620301957U CN205501801U CN 205501801 U CN205501801 U CN 205501801U CN 201620301957 U CN201620301957 U CN 201620301957U CN 205501801 U CN205501801 U CN 205501801U
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- piston
- isolation system
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- antivibrator
- bridge
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Abstract
The utility model provides a friction damper that restores to throne certainly for beam bridge shock isolation system, including attenuator jar, rubbing device, a resilient means, the 2nd resilient means, piston and guide bar, the guide bar runs through whole attenuator jar, and the activity is controlled and respectively through wall connection about a resilient means and the 2nd resilient means and attenuator jar along the guide bar to the piston, the last lower wall swing joint of rubbing device and attenuator jar, and the piston passes through connecting inclined rod is connected with rubbing device, is equipped with stop device between connecting inclined rod and the piston. An object of the utility model is to provide a have the power consumption ability concurrently and from the attenuator of reset function, the device has frictional force in the time of can making the skew balancing seat of superstructure and realizes the power consumption, and is recovering to the in -process of balancing seat do not have frictional force, reduces the resistance that restores to the throne to each component of whole in -process attenuator all in the elastic range, thereby effectively overcome a series of problems that prior art exists.
Description
Technical field
This utility model relates to beam bridge shake-proof technology field, is specifically related to a kind of Self-resetting frcition damper for bridge isolation system.
Background technology
At present both at home and abroad have turned out shock insulation about bridge isolation systematic research and can effectively reduce the horizontal inertial force that bridge pier is subject to, thus reduce its section turn moment and shearing, it is to avoid its bending or failure by shear.But current bridge isolation system generally there are following problem:
(1) shock isolation system does not plays a role when little shake, when in running into, big shake time just can enable shock isolation system, shock isolation system usually cutting off or just starting to play a role after anti-knock block destruction until shearing pin, needing to change the associated components of shock isolation system after shake, this has resulted in the increase of rehabilitation expense after shaking.
(2) at present the power consumption of bridge isolation system typically uses frictional force consume energy, relatively big for increase that frictional force typically designs by its energy dissipation capacity, but this frictional force needs to yet suffer from during reset after earthquake terminates, and prevents the reset of superstructure.
(3) energy dissipation capacity that part earthquake isolating equipment utilizes mild steel to have under course under cyclic loading after entering mecystasis realizes power consumption, but the energy-dissipating device of this material does not have Self-resetting function.
Utility model content
The purpose of this utility model is to provide a kind of antivibrator having energy dissipation capacity and Self-resetting function concurrently for defect of the prior art, this device can make have frictional force during superstructure deviation equilbrium position and realize power consumption, and not there is during returning to equilbrium position frictional force, reduce reset resistance, and each component of antivibrator is in elastic range during whole, thus effectively overcome the series of problems that prior art exists.
The technical scheme that this utility model is used is as follows:
For the Self-resetting frcition damper of bridge isolation system, including antivibrator cylinder, rubbing device, the first elastic device, the second elastic device, piston and guide post；Guide post runs through whole antivibrator cylinder, and piston is along movable about guide post and be connected with the left and right wall of antivibrator cylinder by the first elastic device and the second elastic device respectively；The upper lower wall of rubbing device and antivibrator cylinder is flexibly connected, and piston is connected with rubbing device by bracing diagonal, is provided with stopping means between bracing diagonal and piston.
Install for convenience, it is simple to using, described rubbing device is friction plate, and described stopping means is Limit screw.
Using Self-resetting frcition damper for ease of bridge isolation system, described antivibrator cylinder is connected with the concrete bent cap of beam bridge by pull bar；Described piston is connected with the concrete girder of beam bridge by pull bar.
In order to preferably realize the Self-resetting function of antivibrator, described first elastic device is compression spring, and described compression spring arranges around guide post and is connected with the right wall of antivibrator cylinder；Described second elastic device is extension spring, and described extension spring arranges around guide post and is connected with the left wall of antivibrator cylinder；Described guide post is at least provided with two, and corresponding each guide post, the left and right of piston is designed with extension spring and compression spring；The upper lower wall of described antivibrator cylinder is arranged with multiple rubbing device, and bracing diagonal and the stopping means of corresponding each rubbing device are required for isometric setting.
For the ease of increasing friction force during piston activity, described bracing diagonal is free to rotate with the junction of rubbing device and piston.
Being applied to bridge isolation system for the ease of this utility model, when described pull bar is connected with beam bridge main body, there is provision of steel strand wires between the two, described pull bar is solely subjected to pulling force.
When there is displacement to the right under external force in the piston of antivibrator, bracing diagonal becomes big with the angle of piston, then promote friction plate close to antivibrator casing wall, when contact pressure between friction plate and casing wall reaches design pressure, Limit screw stops the further increase of angle, the contact pressure between friction plate and casing wall is made to reach maximum, now produce stiction between friction plate and casing wall, when external force is more than this stiction, frictional force between friction plate and casing wall is changed into force of sliding friction, when piston reaches right side maximum displacement, piston no longer moves, external force is all undertaken by casing wall.If now external force is removed, then piston has the trend being moved to the left under the common effect of extension spring and compression spring, and now angle between bracing diagonal and piston diminishes, and friction plate departs from casing wall, and frictional force disappears, then piston is moved to the left.Until piston reaches left side displacement maximum, it is moved to the left from equilbrium position during this and again returns to the tensile displacement curve of equilbrium position as it is shown on figure 3, wherein:
OA section: now external force is less than maximum static friction force, piston without the displacement of relative casing wall, the displacement in this stage be by antivibrator on the left of pull bar cause due to applied elongation, the slope of line segment OA is equal to tension section modulus EA of pull bar on the left of antivibrator.
AB section: the pulling force of A point is equal to the maximum static friction force of antivibrator, when external force continues to increase, frictional force becomes force of sliding friction and remains steady state value, the power that now piston is subject to has two parts, a part is force of sliding friction, a part is the drawing-pressing spring power to piston, and the slope of line segment AB section is equal to coefficient of elasticity k of drawing-pressing spring1+k2, and k1+k2Much smaller than tension section modulus EA of pull bar on the left of antivibrator.The displacement in this stage is mainly the piston displacement relative to casing wall.
BC section: when piston displacement reach left side do big displacement time, external force gradually removes, and now piston is without the displacement of relative casing wall, and the displacement in this stage is that the draw-bar pull on the left of antivibrator diminishes the recovery displacement produced.
CO section: the power that when power of C point is moved to right side maximum displacement equal to piston by left side maximum displacement, spring produces, when external force continues to remove, piston is moved to the left under the restoring force effect of spring, until left side maximum displacement.
Visible by said process, although AB section also has slope, but this slope is much smaller than the slope of OA section, it is negligible, then this device is similar to a preferable elastoplasticity device, and has Self-resetting function, and the various piece of working stage device is in elastic range, therefore the F S curve of Fig. 3 has repeatability, will not have residual displacement as elastic-plastic material.In a word, this antivibrator has the function of " having frictional force when piston moves right, the zerofriction force when piston is moved to the left ".
This utility model has the advantage that relative to prior art or beneficial effect:
1, of the present utility model simple and practical, have energy dissipation capacity and Self-resetting function concurrently, can make to produce frictional force during superstructure deviation equilbrium position and realize power consumption, and during returning to equilbrium position, do not produce frictional force, reduce reset resistance, and whole during each component of antivibrator be in elastic range, it is not easy to damage, the maintenance cost reduced, improves service life.
2, piston two of the present utility model connects extension spring and compression spring respectively, improves the self-resetting capability of structure itself.
3, it is provided with Limit screw between piston of the present utility model and bracing diagonal, it is ensured that during piston excursion, produce the power consumption of bigger frictional force, during reset, does not produce frictional force, simple in construction, powerful.
4, it is provided with multiple guide post in the middle part of antivibrator cylinder of the present utility model, it is ensured that the skew in piston movement occurred level direction and reset, improves the anti-seismic performance of beam bridge.
5, this utility model can be symmetrical set in the middle of actually used, and no matter that direction, left and right can be resetted easily by after external force generation skew, substantially increases the shockproof of beam bridge, damping performance, and structure design is simple, and practicality is higher.
Accompanying drawing explanation
Fig. 1 is damper structure schematic diagram of the present utility model；
Fig. 2 is this utility model application schematic diagram in bridge isolation system；
Fig. 3 is tensile displacement curve chart during utility model works；
Fig. 4 is the bridge isolation system simplification figure of Self-resetting frcition damper；
Fig. 5 is the bridge isolation system each state F-S curve chart simplified.
Detailed description of the invention
Below in conjunction with accompanying drawing, the Self-resetting frcition damper for bridge isolation system of the present utility model is described in further detail.
As it is shown in figure 1, the Self-resetting frcition damper for bridge isolation system of the present utility model, including antivibrator cylinder 1, rubbing device the 2, first elastic device the 3, second elastic device 4, piston 7 and two guide posts 8 organizing setting symmetrical above and below more.Two guide posts 8 run through whole antivibrator cylinder 1, and piston 7 is movable along guide post about 8 and is connected with the left and right wall of antivibrator cylinder 1 by the first elastic device 3 and the second elastic device 4 respectively；The upper lower wall of rubbing device 2 and antivibrator cylinder 1 is flexibly connected, and piston 7 is connected with rubbing device 2 by bracing diagonal 5, wherein, the preferred stopping means 6 that is provided with between friction plate, and bracing diagonal 5 and piston 7 of rubbing device 2, the preferred Limit screw of stopping means 6；Bracing diagonal 5 is free to rotate with the junction of rubbing device 2 and piston 7；First elastic device 3 uses compression spring, and compression spring arranges around guide post 8 and is connected with the right wall of antivibrator cylinder 1；Second elastic device 4 uses extension spring, and extension spring arranges around guide post 8 and is connected with the left wall of antivibrator cylinder 1.
This utility model is when for beam bridge anti-shock system, and antivibrator cylinder 1 is connected with the concrete bent cap of beam bridge by pull bar 9；Piston 7 is connected with the concrete girder of beam bridge by pull bar 9；When pull bar 9 is connected with beam bridge main body, there is provision of steel strand wires between the two, pull bar 9 is solely subjected to pulling force.
As in figure 2 it is shown, the bridge isolation system of tool Self-resetting frcition damper is mainly made up of steel strand wires 27, Self-resetting frcition damper 25 and teflon sliding bearing 26, also include concrete girder 21, concrete bent cap 22, concrete pier 23, anchor block 24.This system can ensure that when little shake bridge pier and superstructure are without relative displacement, follow-up use to beam bridge does not has any impact, occurring under middle shake or big shake effect can the relative displacement of manual control, thus reduce substructure and reach the seismic force of superstructure, effectively prevent bridge pier from shearing or bending failure and the beam that laterally falls of superstructure occurring.When earthquake stops, the relative displacement of top and the bottom structure can recover again under the effect of this system, reduces the rehabilitation expense of beam bridge after shake with this.
Bridge isolation system to the tool Self-resetting frcition damper shown in Fig. 2, if superstructure is reduced to a lumped mass, bent cap replaces by a fixing device, then this system can be reduced to single-degree of freedom vibration structural system as shown in Figure 4.
1, poised state
State shown in Fig. 4 is the poised state of structure, and now the pulling force of both sides steel strand wires is equal to zero.And now antivibrator A piston is positioned at the maximum displacement of left side, antivibrator B piston is positioned at the maximum displacement of right side.
2, be there is displacement to the left by equilbrium position in lumped mass
Now steel strand wires II pulling force remains as zero, and the pulling force of steel strand wires III is increasingly greater than zero, then there is stiction between antivibrator B friction plate and casing wall, therefore when the pulling force of steel strand wires III is less than the stiction between antivibrator B friction plate and casing wall, piston is motionless, and when this displacement continues to increase, piston starts to slide, stiction becomes force of sliding friction, and now the pulling force of steel strand wires III keeps constant.
3, lumped mass is subjected to displacement to equilbrium position by left side maximum displacement
Now the pulling force of steel strand wires III is gradually reduced, and have stiction between antivibrator B friction plate and casing wall, when lumped mass reaches equilbrium position, steel strand wires III pulling force is zero, now zerofriction force between antivibrator B friction plate and casing wall, antivibrator B piston Tong Bu moves right with lumped mass under the effect of tension and compression spring and reaches maximum displacement on the right side of this antivibrator.And antivibrator A is unchanged in this course.
4, lumped mass is moved by equilbrium position maximum displacement to the right
Now steel strand wires III pulling force remains as zero, and the pulling force of steel strand wires II is increasingly greater than zero, then there is stiction between antivibrator A friction plate and casing wall, therefore when the pulling force of steel strand wires II is less than the stiction between antivibrator A friction plate and casing wall, piston is motionless, and when this displacement continues to increase, piston starts to slide, stiction becomes force of sliding friction, and now the pulling force of steel strand wires II keeps constant.
5, lumped mass is subjected to displacement to equilbrium position by right side maximum displacement
Now the pulling force of steel strand wires II is gradually reduced, and have stiction between antivibrator A friction plate and casing wall, when lumped mass reaches equilbrium position, steel strand wires II pulling force is zero, now zerofriction force between antivibrator A friction plate and casing wall, antivibrator A piston Tong Bu moves right with lumped mass under the effect of tension and compression spring and reaches maximum displacement on the right side of this antivibrator.And antivibrator B is unchanged in this course.
Above-mentioned 2nd, 3,4, the F-S curve of 5 steps as shown in Figure 5.
6, lumped mass locates earthquake stopping at an arbitrary position
Now be equivalent to lumped mass stop suddenly on left side or the right side of equilbrium position, assuming that be parked on the left of equilbrium position, now the piston of antivibrator A is positioned on the left of it at maximum position and the power of steel strand wires II and tension, compression spring is zero, antivibrator B piston is positioned at the left side of maximum displacement on the right side of it, and tension, compression spring have restoring force to the right to piston, steel strand wires III pulling force is equal to antivibrator B stiction.Then lumped mass can occur to the right micro-displacement under steel strand wires III pulling force effect, the pulling force making steel strand wires III is gradually reduced, when this pulling force is less than antivibrator B drawing-pressing spring restoring force, piston and lumped mass move right under spring restoring force effect, until lumped mass reaches equilbrium position, i.e. lumped mass has Self-resetting function.
In a word, when beam bridge structure meets with little shake effect, pier top horizontal displacement is less, the least to the horizontal force of superstructure, the stiction of antivibrator can be adjusted by adjusting Limit screw in antivibrator, make under little shake effect superstructure and pier top without relative displacement, when running into middle shake or shaking greatly, pier top horizontal displacement is bigger, now this device can make to occur between pier top and superstructure relative displacement, and pier top has horizontal displacement, and superstructure is not subjected to displacement with pier top, thus reduce the horizontal acceleration of superstructure, the horizontal inertial force that reduction pier top is subject to is at elastic range, and during pier top with superstructure generation relative displacement, realize power consumption by frictional force, thus avoid or reduce the destruction of bridge pier.When earthquake stops, the relative displacement of superstructure Yu pier top can be decreased to zero again by this device, reaches Self-resetting function.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all any amendment, equivalent and improvement etc. made within spirit of the present utility model and principle, within should be included in protection domain of the present utility model.
Claims (10)
1. for the Self-resetting frcition damper of bridge isolation system, it is characterised in that include antivibrator cylinder (1), rubbing device (2), the first elastic device (3), the second elastic device (4), piston (7) and guide post (8)；Described guide post (8) runs through whole antivibrator cylinder (1), and described piston (7) is movable along guide post (8) left and right and is connected with the left and right wall of antivibrator cylinder (1) by the first elastic device (3) and the second elastic device (4) respectively；The upper lower wall of described rubbing device (2) and antivibrator cylinder (1) is flexibly connected, and piston (7) is connected with rubbing device (2) by bracing diagonal (5).
2. the Self-resetting frcition damper for bridge isolation system as claimed in claim 1, it is characterised in that described rubbing device (2) is friction plate.
3. the Self-resetting frcition damper for bridge isolation system as claimed in claim 2, it is characterised in that be provided with stopping means (6) between described bracing diagonal (5) and piston (7).
4. the Self-resetting frcition damper for bridge isolation system as claimed in claim 3, it is characterised in that described stopping means (6) is Limit screw.
5. the Self-resetting frcition damper for bridge isolation system as claimed in claim 4, it is characterised in that
Described antivibrator cylinder (1) is connected with the concrete bent cap of beam bridge by pull bar (9)；Described piston (7) is connected with the concrete girder of beam bridge by pull bar (9).
6. the Self-resetting frcition damper for bridge isolation system as claimed in claim 5, it is characterised in that described first elastic device (3) is compression spring, and described compression spring arranges around guide post (8) and is connected with the right wall of antivibrator cylinder (1)；Described second elastic device (4) is extension spring, and described extension spring arranges around guide post (8) and is connected with the left wall of antivibrator cylinder (1).
7. the Self-resetting frcition damper for bridge isolation system as claimed in claim 6, it is characterised in that described guide post (8) is at least provided with two, and corresponding each guide post (8), the left and right of piston (7) is designed with extension spring and compression spring.
8. the Self-resetting frcition damper for bridge isolation system as claimed in claim 7, it is characterised in that the upper lower wall of described antivibrator cylinder (1) is arranged with multiple rubbing device (2)；The bracing diagonal (5) of corresponding each rubbing device (2) and stopping means (6) isometric setting.
9. the Self-resetting frcition damper for bridge isolation system as claimed in claim 8, it is characterised in that
Described bracing diagonal (5) is free to rotate with the junction of rubbing device (2) and piston (7).
10. the Self-resetting frcition damper for bridge isolation system as claimed in claim 9, it is characterised in that when described pull bar (9) is connected with beam bridge main body, there is provision of steel strand wires between the two, described pull bar (9) is solely subjected to pulling force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620301957.4U CN205501801U (en) | 2016-04-12 | 2016-04-12 | A friction damper that restores to throne certainly for beam bridge shock isolation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620301957.4U CN205501801U (en) | 2016-04-12 | 2016-04-12 | A friction damper that restores to throne certainly for beam bridge shock isolation system |
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| Publication Number | Publication Date |
|---|---|
| CN205501801U true CN205501801U (en) | 2016-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620301957.4U Withdrawn - After Issue CN205501801U (en) | 2016-04-12 | 2016-04-12 | A friction damper that restores to throne certainly for beam bridge shock isolation system |
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| CN (1) | CN205501801U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105735106A (en) * | 2016-04-12 | 2016-07-06 | 兰州理工大学 | Self-resetting friction damper for beam bridge seismic isolation system |
| CN108978446A (en) * | 2018-09-28 | 2018-12-11 | 武汉理工大学 | A kind of Self-resetting energy-dissipation structure suitable for bridge |
| CN115948976A (en) * | 2022-12-19 | 2023-04-11 | 中交公路规划设计院有限公司 | Longitudinal combination toughness constraint system and method for large-span suspension bridge |
-
2016
- 2016-04-12 CN CN201620301957.4U patent/CN205501801U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105735106A (en) * | 2016-04-12 | 2016-07-06 | 兰州理工大学 | Self-resetting friction damper for beam bridge seismic isolation system |
| CN105735106B (en) * | 2016-04-12 | 2018-04-03 | 兰州理工大学 | Self-resetting frcition damper for bridge isolation system |
| CN108978446A (en) * | 2018-09-28 | 2018-12-11 | 武汉理工大学 | A kind of Self-resetting energy-dissipation structure suitable for bridge |
| CN108978446B (en) * | 2018-09-28 | 2024-04-12 | 武汉理工大学 | Self-resetting energy consumption structure suitable for bridge |
| CN115948976A (en) * | 2022-12-19 | 2023-04-11 | 中交公路规划设计院有限公司 | Longitudinal combination toughness constraint system and method for large-span suspension bridge |
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Granted publication date: 20160824 Effective date of abandoning: 20180403 |
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| AV01 | Patent right actively abandoned |