CN105735106A - Self-resetting friction damper for beam bridge seismic isolation system - Google Patents
Self-resetting friction damper for beam bridge seismic isolation system Download PDFInfo
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- CN105735106A CN105735106A CN201610224695.0A CN201610224695A CN105735106A CN 105735106 A CN105735106 A CN 105735106A CN 201610224695 A CN201610224695 A CN 201610224695A CN 105735106 A CN105735106 A CN 105735106A
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- self
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- isolation system
- resetting
- antivibrator
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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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- Bridges Or Land Bridges (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Abstract
The invention provides a self-resetting friction damper for a beam bridge seismic isolation system. The self-resetting friction damper comprises a damper cylinder, a friction device, a first elastic device, a second elastic device, a piston and a guide rod; the guide rod penetrates through the whole damper cylinder; the piston moves leftwards and rightwards along the guide rod and is respectively connected with the left wall and the right wall of the damper cylinder through the first elastic device and the second elastic device; the friction device is movably connected with the upper wall and the lower wall of the damper cylinder; the piston is connected with the friction device through a connecting oblique rod; a limiting device is arranged between the connecting oblique rod and the piston. The invention aims to provide the damper which has the energy-consuming capacity and a self-resetting function; the self-resetting friction damper has the frictional force to realize energy consumption when an upper structure deviates from an equilibrium position and has no frictional force in the process of returning to the equilibrium position, so that the resetting resistance is reduced; all the components of the damper are within an elastic scope in the whole process, so that a series of problems existing in the prior art are effectively solved.
Description
Technical field
The present invention relates to beam bridge shake-proof technology field, be 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 reducing 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 play a role when little shake, when in running into, big shake time just can enable shock isolation system, shock isolation system is 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) the at present power consumption of bridge isolation system is generally adopted frictional force power consumption, relatively big for what increase that frictional force generally designs by its energy dissipation capacity, but this frictional force needs to yet suffer from when resetting after earthquake terminates, and prevents the reset of superstructure.
(3) part earthquake isolating equipment utilizes the energy dissipation capacity that mild steel has after entering mecystasis under course under cyclic loading to realize power consumption, but the energy-dissipating device of this material does not have Self-resetting function.
Summary of the invention
Present invention aims to defect of the prior art and a kind of antivibrator having energy dissipation capacity and Self-resetting function concurrently is provided, this device can make have frictional force during superstructure deviation equilbrium position and realize power consumption, and not there is frictional force in the process return to equilbrium position, reduce reset resistance, and each component of antivibrator is in elastic range in whole process, thus effectively overcoming the series of problems that prior art exists.
The technical solution adopted in the present invention 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 movable and be connected with the left and right wall of antivibrator cylinder respectively through the first elastic device and the second elastic device along about guide post；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 in order to convenient, 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 better 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.
Increasing friction force during for the ease of 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 the present invention, 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 combined 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, this process is moved to the left the tensile displacement curve again returning to equilbrium position from 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 the 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 the coefficient of elasticity k of drawing-pressing spring1+k2, and k1+k2Much smaller than the tension section modulus EA of pull bar on the left of antivibrator.The displacement in this stage is mainly the displacement of the relative casing wall of piston.
BC section: when piston displacement reach left side do big displacement time, external force is removed gradually, and now piston is without the displacement of relative casing wall, the displacement in this stage be the draw-bar pull on the left of antivibrator diminish produce recovery displacement.
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 desirable 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 ".
The present invention has the advantage that relative to prior art or beneficial effect:
1, the present invention's is 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 return to and the process of equilbrium position does not produce frictional force, reduce reset resistance, and in whole process, each component of antivibrator is in elastic range, it is not easy to damage, the maintenance cost reduced, improves service life.
2, piston two of the present invention connects extension spring and compression spring respectively, improves the self-resetting capability of structure itself.
3, it is provided with Limit screw between piston and the bracing diagonal of the present invention, 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 the antivibrator cylinder of the present invention, it is ensured that the skew in piston movement occurred level direction and reset, improves the anti-seismic performance of beam bridge.
5, the present invention can be symmetrical set in the middle of actually used, and no matter that direction, left and right is subject to can both resetting easily after external force produces skew, substantially increases the shockproof of beam bridge, damping performance, and structural design is simple, and practicality is higher.
Accompanying drawing explanation
Fig. 1 is the damper structure schematic diagram of the present invention；
Fig. 2 is present invention application schematic diagram in bridge isolation system；
Fig. 3 is present invention tensile displacement curve chart when working；
Fig. 4 is the bridge isolation system simplification figure of Self-resetting frcition damper；
Fig. 5 is each state F-S curve chart of bridge isolation system simplified.
Detailed description of the invention
Below in conjunction with accompanying drawing, the Self-resetting frcition damper for bridge isolation system of the present invention is described in further detail.
As it is shown in figure 1, the Self-resetting frcition damper for bridge isolation system of the present invention, including antivibrator cylinder 1, many group rubbing device the 2, first elastic device 3, second elastic devices 4 of setting symmetrical above and below, piston 7 and two guide posts 8.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 respectively through the first elastic device 3 and the second elastic device 4；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, and the preferred friction plate of rubbing device 2, and between bracing diagonal 5 and piston 7, it is provided with stopping means 6, 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.
The present invention 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, the follow-up use of beam bridge is not had any impact, occurring under middle shake or big shake effect can the relative displacement of manual control, thus reducing substructure to reach the seismic force of superstructure, effectively preventing bridge pier from occurring to shear or the transverse direction of bending failure and superstructure falls beam.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 with 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 left side maximum displacement place, antivibrator B piston is positioned at right side maximum displacement place.
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 remains unchanged.
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 remains unchanged.
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 at the power of maximum position place and steel strand wires II and tension, compression spring on the left of it is zero, antivibrator B piston is positioned at the left side of maximum displacement on the right side of it, and piston is had restoring force to the right by tension, compression spring, steel strand wires III pulling force is equal to antivibrator B stiction.Then can there is to the right micro-displacement in lumped mass 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, namely 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 horizontal force of superstructure is also less, the stiction of antivibrator can be adjusted by Limit screw in adjustment 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 generation relative displacement between pier top and superstructure, and pier top has horizontal displacement, and superstructure is not subjected to displacement with pier top, thus reducing the horizontal acceleration of superstructure, the horizontal inertial force that reduction pier top is subject to is at elastic range, and in the pier top process with superstructure generation relative displacement, realize power consumption by frictional force, thus avoiding 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 presently preferred embodiments of the present invention, not in order to limit the present invention, all any amendment, equivalent replacement and improvement etc. made within the spirit and principles in the present invention, should be included within protection scope of the present invention.
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) respectively through the first elastic device (3) and the second elastic device (4)；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 |
|---|---|---|---|
| CN201610224695.0A CN105735106B (en) | 2016-04-12 | 2016-04-12 | Self-resetting frcition damper for bridge isolation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610224695.0A CN105735106B (en) | 2016-04-12 | 2016-04-12 | Self-resetting frcition damper for bridge isolation system |
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| CN105735106A true CN105735106A (en) | 2016-07-06 |
| CN105735106B CN105735106B (en) | 2018-04-03 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109487703A (en) * | 2019-01-14 | 2019-03-19 | 兰州理工大学 | A kind of function separate type Self-resetting shock-absorption bridge and installation method |
| CN113392450A (en) * | 2021-06-07 | 2021-09-14 | 国能朔黄铁路发展有限责任公司 | Method, device and system for evaluating health state of railway pier |
| CN113958005A (en) * | 2021-11-01 | 2022-01-21 | 天津大学 | Piezoelectric variable friction damping system suitable for large-span space structure |
| CN114351570A (en) * | 2022-01-27 | 2022-04-15 | 北京交通大学 | Transverse equivalent TMD damping control system |
| CN114481821A (en) * | 2021-12-31 | 2022-05-13 | 安徽尚德科技有限公司 | Multidirectional viscous damping support |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113958005A (en) * | 2021-11-01 | 2022-01-21 | 天津大学 | Piezoelectric variable friction damping system suitable for large-span space structure |
| CN114481821A (en) * | 2021-12-31 | 2022-05-13 | 安徽尚德科技有限公司 | Multidirectional viscous damping support |
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| CN114351570A (en) * | 2022-01-27 | 2022-04-15 | 北京交通大学 | Transverse equivalent TMD damping control system |
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Granted publication date: 20180403 Termination date: 20200412 |