CN109235229B - Lever-type damping device and cable-stayed bridge with same - Google Patents
Lever-type damping device and cable-stayed bridge with same Download PDFInfo
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- CN109235229B CN109235229B CN201811044945.8A CN201811044945A CN109235229B CN 109235229 B CN109235229 B CN 109235229B CN 201811044945 A CN201811044945 A CN 201811044945A CN 109235229 B CN109235229 B CN 109235229B
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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
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/04—Cable-stayed bridges
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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
- E01D19/04—Bearings; Hinges
- E01D19/042—Mechanical bearings
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Abstract
The invention discloses a lever-type damping device and a cable-stayed bridge with the same, and relates to the technical field of bridge vibration control. When the stay cable vibrates in the plane, the vibration of the stay cable is directly transmitted to the first damping device through the first lever and is transmitted to the second damping device after the first lever drives the second lever to rotate, and the in-plane vibration reduction effect is achieved. When the stay cable vibrates out of the surface, the vibration of the stay cable is amplified through the out-of-surface lever and then transmitted to the first damping device, and the out-of-surface vibration reduction effect is achieved. The speed locker is arranged between the stay cable and the lever type damping device, the lever type damping device can be installed and play a role in damping in the construction stage, and the lever type damping device can keep a moment balance state in construction or after the installation is finished.
Description
Technical Field
The invention relates to the technical field of bridge vibration control, in particular to a lever type damping device and a cable-stayed bridge with the lever type damping device.
Background
The cable-stayed bridge is one of main bridge types of a large-span bridge, the stay cable is a main stressed member of the cable-stayed bridge, and the stay cable consists of slender high-strength steel wires and has the characteristics of high flexibility, small initial damping ratio and the like, so that the vibration problem of the stay cable caused by wind, travelling and the like is more prominent along with the increase of the span of the cable-stayed bridge. The vibration of the stay cable often causes fatigue cracking of a steel structure in an anchor head area, fatigue damage and stress corrosion of the stay cable, and brings a very serious structural safety problem.
The vibration of the stay cable is controlled by using the external stay cable damper, which has been widely accepted in the engineering and academic circles, but a damping device capable of providing effective additional damping for the inner surface (in the curve plane of the stay cable, hereinafter referred to as the inner surface) and the outer surface (perpendicular to the plane of the stay cable flexible line, hereinafter referred to as the outer surface) of the stay cable is selected, which still has certain difficulty, and along with the increase of the stay cable, the problems of landscape requirement, reduction of the relative installation position of the damper, reduction of the supporting rigidity of the damper and the like all affect the vibration damping effect of the damper to a certain extent. For example, the magnetorheological damper adopted by a certain Yangtze river bridge can only control the large-amplitude in-plane vibration of the stay cable, and cannot effectively control the micro-breadth in-plane vibration and the out-of-plane vibration of the stay cable.
In addition, since the general stay cable damper cannot accommodate the construction and the large displacement between the cable beams due to the second-stage dead load, the stay cable damper can be installed only after the completion of the bridge deck pavement construction. However, during the period from the installation of the stay cable to the completion of the bridge deck pavement construction, the vibration of the stay cable is very severe, but cannot be effectively suppressed, resulting in initial damage of the stay cable.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a lever type damping device and a cable-stayed bridge with the lever type damping device, which meet the requirements of in-plane and out-of-plane vibration reduction of a stay cable of a large-span cable-stayed bridge.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: a lever type damping device is used for vibration reduction of a stay cable and comprises:
the device comprises a first lever, a second lever and a third lever, wherein one end of the first lever is provided with a connecting part for connecting with a stay cable, the other end of the first lever is provided with a first damper, the first lever is rotatably connected with a first rotating shaft, and the first damper is arranged to generate damping force when the first lever rotates around the first rotating shaft and when the first lever moves up and down;
the second lever, second lever one end with first pivot links to each other, the second attenuator is connected to the second lever other end, second lever swivelling joint second pivot, the second pivot with first pivot interval sets up, the second attenuator is set to be in the second lever produces damping force when rotating around the second pivot.
On the basis of the technical scheme, the connecting part comprises a speed locker, and the first lever is connected with the stay cable through the speed locker; when the relative movement speed of the speed locker is low, the speed locker is in an unlocked state; when the relative movement speed of the speed locker is higher, the speed locker is converted into a locking state.
On the basis of the technical scheme, the first rotating shaft is arranged at the position with two thirds of the height of the first lever.
On the basis of the technical scheme, the first rotating shaft is a deep groove ball bearing.
The invention also discloses a cable-stayed bridge with the lever-type damping device, wherein the lever-type damping device comprises:
the device comprises a first lever, a second lever and a third lever, wherein one end of the first lever is provided with a connecting part connected with a stay cable, the other end of the first lever is provided with a first damper, the first lever is rotatably connected with a first rotating shaft, the first rotating shaft is initially positioned in the stay cable surface, and the first damper is arranged to generate damping force when the first lever rotates around the first rotating shaft and when the first lever moves up and down;
the second lever, second lever one end with first pivot links to each other, and the second attenuator is connected to the other end, second lever swivelling joint second pivot, the fixed setting of second pivot just is located the suspension cable off-plate, the second attenuator is set to the second lever produces damping force when rotating around the second pivot.
On the basis of the technical scheme, the connecting part comprises a speed locker, and the first lever is connected with the stay cable through the speed locker; when the relative movement speed of the speed locker is low, the speed locker is in an unlocked state; when the relative movement speed of the speed locker is higher, the speed locker is converted into a locking state.
On the basis of the technical scheme, the connecting part further comprises a cable clamp, a cable clamp hoop and a pin shaft, the cable clamp is fixed with the stay cable, the cable clamp is connected with the cable clamp hoop through the pin shaft, and the lower end of the cable clamp hoop is fixedly connected with the speed locker.
On the basis of the technical scheme, the first rotating shaft is arranged at the position with two thirds of the height of the first lever.
On the basis of the technical scheme, the first rotating shaft is a deep groove ball bearing.
On the basis of the technical scheme, the second rotating shaft is fixed on a support arranged on the bridge floor, a base inclined strut is arranged below the support, and the support is fixed on the bridge floor through the base inclined strut.
Compared with the prior art, the invention has the advantages that:
the lever type damping device is always in a moment balance state by taking the fixedly arranged second rotating shaft as a center. When the stay cable vibrates in the plane, the vibration of the stay cable is directly transmitted to the first damping device through the first lever and is transmitted to the second damping device after the first lever drives the second lever to rotate, and the in-plane vibration reduction effect is achieved. When the stay cable vibrates out of the surface, the vibration of the stay cable is amplified through the out-of-surface lever and then transmitted to the first damping device, and the out-of-surface vibration reduction effect is achieved.
According to the invention, the speed locker is arranged between the stay cable and the lever type damping device, the speed locker is in an unlocked state when the relative movement is low, the damping force is low, and the speed locker is suitable for the position change between the cable clamp and the damping device body caused by cable adjustment, load, bridge deck pavement and the like in the construction stage; when the stay cable vibrates due to wind load, the stay cable is in a locking state when the relative movement speed is high, the vibration displacement of the stay cable is transmitted to the lever type damping device, and the damping effect of the lever type damping device is exerted to control the vibration of the stay cable. The lever type damping device can be installed and play a role in damping in the construction stage, and can keep a moment balance state no matter in construction or after the installation is finished.
Drawings
FIG. 1 is a cross-sectional view of a lever type damper apparatus according to an embodiment of the present invention;
FIG. 2 is a perspective view of a cable-stayed bridge equipped with a lever-type damping device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the out-of-plane vibration of the lever-type damper device in the cable-stayed bridge equipped with the lever-type damper device according to the embodiment of the present invention;
FIG. 4 is a schematic diagram of the lever type damper device of the cable-stayed bridge according to the embodiment of the present invention.
In the figure: 1-a first lever, 10-a connecting part, 101-a speed locker, 102-a cable clamp, 103-a cable clamp hoop, 104-a pin shaft, 11-a first damper, 12-a first rotating shaft, 2-a second lever, 21-a second damper, 22-a second rotating shaft, 3-a stay cable, 4-a bridge deck, 5-a support and 6-a bottom inclined strut.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1, an embodiment of the present invention provides a lever type damping device for damping a stay cable, including:
the device comprises a first lever, a second lever and a third lever, wherein one end of the first lever is provided with a connecting part for connecting with a stay cable, the other end of the first lever is provided with a first damper, the first lever is rotatably connected with a first rotating shaft, and the first damper is arranged to generate damping force when the first lever rotates around the first rotating shaft and when the first lever moves up and down; the first rotating shaft is arranged at the two-thirds height of the first lever. The first rotating shaft is a deep groove ball bearing.
And the second lever is connected with the first rotating shaft at one end, the other end of the second lever is connected with a second damper, the second lever is rotatably connected with the second rotating shaft, the second rotating shaft is arranged at a distance from the first rotating shaft, and the second damper is arranged to generate damping force when the second lever rotates around the second rotating shaft.
The first damper and the second damper can adopt damping modes such as high-damping rubber damping, viscous shear damping, oil damping, magnetorheological damping and the like.
The lever type damping device is always in a moment balance state by taking the fixedly arranged second rotating shaft as a center. When the stay cable vibrates in the plane, the vibration of the stay cable is directly transmitted to the first damping device through the first lever and is transmitted to the second damping device after the first lever drives the second lever to rotate, and the in-plane vibration reduction effect is achieved. When the stay cable vibrates out of the surface, the vibration of the stay cable is amplified through the out-of-surface lever and then transmitted to the first damping device, and the out-of-surface vibration reduction effect is achieved.
The connecting part comprises a speed locker, and the first lever is connected with the stay cable through the speed locker; when the relative movement speed of the speed locker is lower, the speed locker is in an unlocked state; when the relative movement speed of the speed locker is higher, the speed locker is converted into a locking state.
According to the invention, the speed locker is arranged between the stay cable and the lever type damping device, the speed locker is in an unlocked state when the relative movement is low, the damping force is low, and the speed locker is suitable for the position change between the cable clamp and the damping device body caused by cable adjustment, load, bridge deck pavement and the like in the construction stage; when the stay cable vibrates due to wind load, the stay cable is in a locking state when the relative movement speed is high, the vibration displacement of the stay cable is transmitted to the lever type damping device, and the damping effect of the lever type damping device is exerted to control the vibration of the stay cable. The lever type damping device can be installed and play a role in damping in the construction stage, and can keep a moment balance state no matter in construction or after the installation is finished.
Referring to fig. 2, an embodiment of the present invention further discloses a cable-stayed bridge equipped with a lever-type damping device, wherein the lever-type damping device includes:
the first lever is rotatably connected with a first rotating shaft, the first rotating shaft is initially positioned in the stay cable surface, and the first damper is arranged to generate damping force when the first lever rotates around the first rotating shaft and the first lever moves up and down;
and one end of the second lever is connected with the first rotating shaft, the other end of the second lever is connected with a second damper, the second lever is rotatably connected with the second rotating shaft, the second rotating shaft is fixedly arranged and positioned outside the stay cable surface, and the second damper is arranged to generate damping force when the second lever rotates around the second rotating shaft. The first rotating shaft is arranged at the two-thirds height of the first lever. The first rotating shaft is a deep groove ball bearing.
The lever type damping device is always in a moment balance state by taking the fixedly arranged second rotating shaft as a center. When the stay cable vibrates in the plane, the vibration of the stay cable is directly transmitted to the first damping device through the first lever and is transmitted to the second damping device after the first lever drives the second lever to rotate, and the in-plane vibration reduction effect is achieved. When the stay cable vibrates out of the surface, the vibration of the stay cable is amplified through the out-of-surface lever and then transmitted to the first damping device, and the out-of-surface vibration reduction effect is achieved.
The connecting part comprises a speed locker, and the first lever is connected with the stay cable through the speed locker; when the relative movement speed of the speed locker is lower, the speed locker is in an unlocked state; when the relative movement speed of the speed locker is higher, the speed locker is converted into a locking state.
According to the invention, the speed locker is arranged between the stay cable and the lever type damping device, the speed locker is in an unlocked state when the relative movement is low, the damping force is low, and the speed locker is suitable for the position change between the cable clamp and the damping device body caused by cable adjustment, load, bridge deck pavement and the like in the construction stage; when the stay cable vibrates due to wind load, the stay cable is in a locking state when the relative movement speed is high, the vibration displacement of the stay cable is transmitted to the lever type damping device, and the damping effect of the lever type damping device is exerted to control the vibration of the stay cable. The lever type damping device can be installed and play a role in damping in the construction stage, and can keep a moment balance state no matter in construction or after the installation is finished.
The connecting part further comprises a cable clamp, a cable clamp hoop and a pin shaft, the cable clamp is fixed with the stay cable, the cable clamp is connected with the cable clamp hoop through the pin shaft, and the lower end of the cable clamp hoop is fixedly connected with the speed locker.
The second pivot is fixed in and sets up on the support of bridge floor, and the support below is equipped with the base bracing, and the support is fixed in on the bridge floor through the base bracing.
The specific working principle is as follows:
referring to fig. 3, when the stay cable vibrates out of plane, the out-of-plane displacement of the stay cable is transmitted to the first damper via swinging around the first rotation axis, since the distance L1 from the center of the first damper to the first rotation axis is greater than the distance L from the first rotation axis to the center of the stay cable1The magnification of the out-of-plane displacement is n1＝L1/l1. Through the out-of-plane amplification effect, the relative motion displacement of the damping part and the viscous material container in the first damper is larger than the vibration displacement of the inhaul cable, so that the out-of-plane vibration control effect of the inhaul cable can be effectively improved. The first pivot is arranged approximately at 2/3 of the total height of the first lever, adjusting the out-of-plane amplification n, in comparison with a cantilever structure fixed directly to the deck1Reach about 2, reduced the reduction of the out-of-plane damping effect that is caused because of out-of-plane support deformation.
Referring to fig. 4, when the stay cable vibrates in the plane, the displacement of the stay cable is directly transmitted to the first damper, and the in-plane displacement of the stay cable drives the second lever to rotate around the second rotating shaft, so that the displacement of the stay cable is amplified and transmitted to the second damper to play a damping energy dissipation role, and the in-plane amplification factor n is2＝L2/l2The magnification factor can be adjusted by the configuration, and the effect of in-plane vibration control can be improved by the displacement magnification effect.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (10)
1. The utility model provides a lever damping device, its is used for the suspension cable vibration damping, its characterized in that, it includes:
the device comprises a first lever (1), wherein one end of the first lever (1) is provided with a connecting part (10) used for being connected with a stay cable, the other end of the first lever (1) is provided with a first damper (11), the first lever is rotatably connected with a first rotating shaft (12), and the first damper (11) is arranged to generate damping force when the first lever (1) rotates around the first rotating shaft (12) and when the first lever (1) moves up and down;
second lever (2), second lever (2) one end with first pivot (12) link to each other, second attenuator (21) is connected to second lever (2) other end, second lever swivelling joint second pivot (22), second pivot (22) with first pivot (12) interval sets up, second attenuator (21) are set to second lever (2) produce damping force when rotating around second pivot (22).
2. A lever type damping device as claimed in claim 1, wherein: the connecting part (10) comprises a speed locker (101), and the first lever is connected with a stay cable through the speed locker (101); when the relative movement speed of the speed locker (101) is low, the speed locker (101) is in an unlocked state; when the relative movement speed of the speed locker (101) is high, the speed locker (101) is converted into a locking state.
3. A lever type damping device as claimed in claim 1, wherein: the first rotating shaft (12) is arranged at the two-thirds height of the first lever (51).
4. A lever type damping device as claimed in claim 1, wherein: the first rotating shaft (12) is a deep groove ball bearing.
5. A cable-stayed bridge equipped with a lever-type damping device, characterized in that the lever-type damping device comprises:
the device comprises a first lever (1), wherein one end of the first lever (1) is provided with a connecting part (10) connected with a stay cable, the other end of the first lever is provided with a first damper (11), the first lever (1) is rotatably connected with a first rotating shaft (12), the first rotating shaft (12) is located in the plane of the stay cable in an initial state, and the first damper (11) is arranged to generate damping force when the first lever (1) rotates around the first rotating shaft (12) and when the first lever (1) moves up and down;
second lever (2), second lever (2) one end with first pivot (12) link to each other, and second attenuator (21) is connected to the other end, second lever swivelling joint second pivot (22), second lever (2) swivelling joint second pivot (22), second pivot (22) are fixed to be set up and are located the suspension cable off-plate, second attenuator (21) are set to second lever (2) produce damping force when rotating around second pivot (22).
6. A cable-stayed bridge with lever type damping means according to claim 5, wherein: the connecting part (10) comprises a speed locker (101), and the first lever is connected with a stay cable through the speed locker (101); when the relative movement speed of the speed locker (101) is low, the speed locker (101) is in an unlocked state; when the relative movement speed of the speed locker (101) is high, the speed locker (101) is converted into a locking state.
7. A cable-stayed bridge with lever type damping devices according to claim 6, wherein: the connecting part (10) further comprises a cable clamp (102), a cable clamp hoop (103) and a pin shaft (104), the cable clamp (102) is fixed with the stay cable (3), the cable clamp (102) is connected with the cable clamp hoop (103) through the pin shaft (104), and the lower end of the cable clamp hoop (103) is fixedly connected with the speed locker (101).
8. A cable-stayed bridge with lever type damping means according to claim 5, wherein: the first rotating shaft (12) is arranged at the two-thirds height of the first lever (51).
9. A cable-stayed bridge with lever type damping means according to claim 5, wherein: the first rotating shaft (12) is a deep groove ball bearing.
10. A cable-stayed bridge with lever type damping means according to claim 5, wherein: the second rotating shaft (22) is fixed on a support (5) arranged on the bridge floor (4), a base inclined strut (6) is arranged below the support (5), and the support (5) is fixed on the bridge floor (4) through the base inclined strut (6).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811044945.8A CN109235229B (en) | 2018-09-07 | 2018-09-07 | Lever-type damping device and cable-stayed bridge with same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811044945.8A CN109235229B (en) | 2018-09-07 | 2018-09-07 | Lever-type damping device and cable-stayed bridge with same |
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| CN109235229A CN109235229A (en) | 2019-01-18 |
| CN109235229B true CN109235229B (en) | 2020-05-12 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110158465B (en) * | 2019-05-13 | 2024-01-26 | 中铁大桥科学研究院有限公司 | Lever quality damping system for controlling stay cable vibration |
| CN112227179B (en) * | 2020-09-30 | 2022-04-15 | 中铁大桥局集团有限公司 | Displacement amplification device for stay cable external damper and cable-stayed bridge |
| CN112984220B (en) * | 2021-02-22 | 2022-11-15 | 中国核动力研究设计院 | Vibration reduction and isolation hanging bracket for nuclear power pipeline |
| CN112963622B (en) * | 2021-02-22 | 2022-11-15 | 中国核动力研究设计院 | High-damping vibration reduction and isolation support for nuclear power pipeline |
| CN116150567B (en) * | 2023-04-21 | 2023-07-18 | 温州电力建设有限公司 | Optimization method of inhaul cable-lever rotation inertial-volume damper system in power transmission tower body |
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| CN101613991A (en) * | 2008-06-23 | 2009-12-30 | 同济大学 | Lever-type gain device for damper |
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| EP2636795A1 (en) * | 2012-03-08 | 2013-09-11 | The European Union, represented by the European Commission | A method for protecting taut cables from vibrations |
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