CN115262370A - Three-lever mass damping device for stay cable - Google Patents

Abstract

The application relates to a three-lever mass damping device for a stay cable, which comprises a main lever, wherein one end of the main lever is used for being connected with the stay cable; the in-plane damping mechanism comprises an in-plane damper with one end used for being connected with the bridge floor, the other end of the in-plane damper is provided with an in-plane lever, and the in-plane lever is hinged with the main lever and used for amplifying and transmitting the inner displacement of the stay cable surface to the in-plane damper after being connected with the bridge floor; and the out-of-plane damping mechanism comprises an out-of-plane damper, one end of the out-of-plane damper is used for being connected with the bridge floor, the other end of the out-of-plane damper is provided with an out-of-plane lever, and the out-of-plane lever is hinged with the main lever through a connecting rod and is used for amplifying and transmitting the out-of-plane displacement of the stay cable plane to the out-of-plane damper after being connected with the bridge floor. The damping device real bridge installation and later stage management of this application are all comparatively convenient, and the transmission to attenuator after all being enlargied of stay cable face internal vibration and off-plate vibration simultaneously can guarantee the damping effect, and need not additionally set up large-scale attenuator support, reduces construction cost and guarantees the view effect.

Description

Three-lever mass damping device for stay cable

Technical Field

The application relates to the technical field of stay cable vibration reduction, in particular to a three-lever mass damping device for a stay cable.

Background

The cable-stayed bridge has been widely applied in the field of bridge construction engineering due to its excellent structural form, beautiful structure, large span and flexible arrangement. The stay cable is a low-damping slender structure, the length-to-fineness ratio of the stay cable is increased along with the increase of the span of the cable-stayed bridge, the stay cable is more prone to vibration, the amplitude of the vibration is larger, and more vibration modes are generated. The vibration of the stay cable can cause fatigue damage of the stay cable, the service life of the stay cable is shortened, and most of bearing capacity of the stay cable can be lost or the stay cable can be out of work under severe conditions, so that the safety of the whole bridge is seriously affected.

The vibration direction of the stay cables is perpendicular to the wind direction, and generally mainly involves in-plane (in the plane of the stay cable curve), while the stay cables may vibrate out-of-plane (perpendicular to the plane of the stay cable curve) when wind occurs parallel to the axis of the bridge. At present, the measures for controlling the vibration of the stay cable mainly depend on the mode of adding a damper to improve the modal damping of the stay cable so as to inhibit the vibration of the stay cable.

For the vibration reduction of the ultra-long stay cable, a large-size support is generally required to be adopted to support the damping device, and then a plurality of groups of dampers are arranged between the stay cable and the support to simultaneously inhibit the in-plane and out-of-plane vibration of the stay cable.

Disclosure of Invention

The embodiment of the application provides a three lever quality damping devices of suspension cable to solve among the correlation technique problem that the support is with high costs, damping device mounting height is big and the later stage is managed and is maintained the inconvenience.

The technical scheme adopted by the application is as follows:

a stay cable three-lever mass damping device comprises:

one end of the main lever is used for being connected with the stay cable;

the in-plane damping mechanism comprises an in-plane damper with one end used for being connected with the bridge deck, the other end of the in-plane damper is provided with an in-plane lever, and the in-plane lever is hinged with the main lever and used for amplifying and transmitting the in-plane displacement of the stay cable to the in-plane damper after being connected with the bridge deck;

and the out-of-plane damping mechanism comprises an out-of-plane damper with one end used for being connected with the bridge floor, the other end of the out-of-plane damper is provided with an out-of-plane lever, and the out-of-plane lever is hinged with the main lever through a connecting rod and is used for amplifying and transmitting the out-of-plane displacement of the stay cable to the out-of-plane damper after being connected with the bridge floor.

In some embodiments, the in-plane lever is provided with a first hinge part hinged with the main lever, a second hinge part hinged with the bridge deck, and a third hinge part hinged with the in-plane damper, and the distance from the second hinge part to the first hinge part is smaller than the distance from the second hinge part to the third hinge part.

In some embodiments, a fifth hinge element hinged to the connecting rod is disposed on the main lever, and a distance from the fifth hinge element to the first hinge element is smaller than a distance from one end of the main lever, which is used for being connected to a stay cable, to the first hinge element.

In some embodiments, the out-of-plane lever is provided with a sixth hinge hinged to the connecting rod, a seventh hinge hinged to the bridge deck, and an eighth hinge hinged to the out-of-plane damper, and a distance from the seventh hinge to the sixth hinge is smaller than a distance from the seventh hinge to the eighth hinge.

In some embodiments, a ratio of a distance from the seventh hinge to the eighth hinge to a distance from the seventh hinge to the sixth hinge is greater than a ratio of a distance from an end of the main lever for connecting a stay cable to the first hinge to a distance from the fifth hinge to the first hinge.

In some embodiments, the in-plane damper is hinged to the deck by a fourth hinge, and the hinge point is fixed.

In some embodiments, the position of the second hinge on the in-plane lever is movable along the length of the in-plane lever.

In some embodiments, a position of the seventh hinge on the out-of-plane lever is movable along a length direction of the out-of-plane lever.

In some embodiments, the in-plane damper is an asymmetric stroke design.

In some embodiments, the out-of-plane damper and the in-plane damper are each one of an inertially-based eddy current damper, a viscous damper, a magnetorheological damper, and an inertially-based viscous shear damper.

The beneficial effect that technical scheme that this application provided brought includes:

the embodiment of the application provides a three lever quality damping device of suspension cable, it sets up attenuator and the outer attenuator of face in being close to the bridge floor in with, through main lever and the cooperation of the lever in the face with the vibration amplification transmission to the attenuator in the face of suspension cable face, through the main lever, connecting rod and the cooperation of the lever outside with the vibration amplification transmission to the off-plate attenuator of suspension cable face, realize to the damping function of suspension cable face in and off-plate, because the setting of main lever, can make in the face attenuator and the outer attenuator of face set up in being close to the bridge floor, conveniently install and later stage management, simultaneously the vibration of suspension cable face internal vibration and off-plate vibration all are enlargied the back and are transmitted to the attenuator, can guarantee the damping effect, and need not additionally set up large-scale attenuator support, construction cost can be reduced, and guarantee the view effect.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic diagram illustrating a principle of a stay cable three-lever mass damping device according to the present application;

fig. 2 is a schematic structural diagram of a stay cable three-lever mass damping device provided in an embodiment of the present application.

In the figure: 1. a main lever; 101. a connecting rod; 102. a connecting seat; 103. a vibration transmission lever; 104. a flange; 2. an in-plane lever; 3. an in-plane damper; 4. a first hinge member; 5. a second hinge member; 6. a third hinge member; 7. a fourth hinge member; 8. an out-of-plane lever; 9. an out-of-plane damper; 10. a connecting rod; 11. a fifth hinge member; 12. a sixth hinge; 13. a seventh hinge; 14. an eighth hinge member; 15. a ninth hinge member; 16. a cable clamp; 17. a support; 18. a base; 19. a stiffening plate; 20. a bearing seat; 21. a housing.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The embodiment of the application provides a three lever quality damping devices of suspension cable, it can solve present damping device's support with high costs, damping device mounting height is big and the comparatively inconvenient problem of later stage management maintenance.

Referring to fig. 1-2, the stay cable three-lever mass damping device comprises a main lever 1, an in-plane damping mechanism and an out-of-plane damping mechanism.

One end of the main lever 1 is used for connecting with the stay cable, the main lever 1 can be formed by a linear rod-shaped member, and in this embodiment, the main lever 1 is formed by a connecting rod 101, a connecting seat 102 and a vibration transmission lever 103, the upper end of the connecting rod 101 is connected with a cable clamp 16 for connecting with the stay cable, the lower end of the connecting rod 101 is connected with the connecting seat 102, and one end of the vibration transmission lever 103 is connected with the connecting seat 102; through the arrangement, the structural strength of the main lever can be improved, and the installation difficulty can be reduced.

Specifically, the connecting rod 101 is a structure in which a rod-shaped member is folded and bent, and the lower end of the connecting rod is triangular, a cushion block is arranged between gaps at two folded ends of the rod-shaped member at the upper end of the connecting rod 101, a connecting plate is arranged on the cushion block, the connecting plate is connected with the cable clamp 16 through a pin shaft, correspondingly, two connecting blocks are arranged on the cable clamp 16, and the connecting plate is arranged between the two connecting blocks and enables the pin shaft to penetrate through the two connecting blocks and the connecting plate so as to realize the connection between the main lever 1 and the cable clamp 16; two connecting rings are arranged on the connecting seat 102, and the lower end of the connecting rod 101 penetrates through the two connecting rings and is fixed; one end of the vibration transmission lever 103 is fixedly connected with the connecting seat 102 through a flange 104, and the vibration transmission lever 103 and the connecting rod 101 are consistent in length direction and are arranged along a straight line direction. When the device is installed, the cable clamp 16 is sleeved on the stay cable, the main lever 1 is in a vertical state after the main lever 1 is connected with the cable clamp 16, and then an inner damping mechanism and an outer damping mechanism are installed on the bridge floor.

The in-plane damping mechanism comprises an in-plane damper 3 and an in-plane lever 2, one end of the in-plane damper 3 is used for being connected with the bridge floor, the in-plane lever 2 is connected with the other end of the in-plane damper 3, and the in-plane lever 2 is hinged to the main lever 1 and used for amplifying and transmitting the displacement of the inclined stay cable in the plane to the in-plane damper 3 after being connected with the bridge floor.

Specifically, the in-plane lever 2 is provided with a first hinge member 4 hinged to the main lever 1, a second hinge member 5 hinged to the bridge deck, and a third hinge member 6 hinged to the in-plane damper 3, so that the distance from the second hinge member 5 to the first hinge member 4 is set to be smaller than the distance from the second hinge member 5 to the third hinge member 6 in order to achieve the function of amplifying and transmitting the displacement of the stay cable in the plane to the in-plane damper 3.

In this embodiment, two supporting seats 17 are installed on the bridge deck, the two supporting seats 17 are respectively located at two sides of the main lever 1, specifically, the two supporting seats 17 are both installed on a base 18 fixed on the bridge deck, and the two supporting seats 17 are connected through a stiffening plate 19 to improve the overall rigidity; in the initial state, the in-plane lever 2 is arranged horizontally and along the transverse bridge direction, one end of the in-plane lever 2 is hinged with one of the supports 17 through the second hinge member 5, the middle part of the in-plane lever 2 is hinged with the connecting seat 102 in the main lever 1 through the first hinge member 4, the damping force direction of the in-plane damper 3 is vertical, the in-plane damper is mounted on the other support 17, and the upper end of the in-plane lever 2 is hinged with one end of the in-plane lever 2 away from the second hinge member 5 through the third hinge member 6. In other embodiments, it is also possible to arrange the two abutments 17 on the same side of the main lever 1, so that the first hinge 4 is located in the middle of the in-plane lever 2, while the second hinge 5 and the third hinge 6 are located at the two ends of the in-plane lever 2.

Through the arrangement, the mounting position of the damping mechanism in the plane can be closer to the bridge floor, so that the mounting difficulty of the damping mechanism in the plane can be reduced, the size of the support 17 is reduced, and meanwhile, later-stage management maintenance is facilitated.

The in-plane damper 3 is any one of an inerter eddy current damper, a viscous damper, a magnetorheological damper and an inerter viscous shear damper, and is selected according to actual needs, and in this embodiment, the in-plane damper is inerter eddy current damping.

When the stay cable generates the in-plane displacement, the main lever 1 is vertically moved, the main lever 1 drives the in-plane lever 2 to rotate around the second hinged part 5 through the first hinged part 4, and then drives the third hinged part 6 to move, so that the in-plane damper 3 generates the damping force through the internal displacement, and the effect of in-plane vibration reduction is achieved.

The out-of-plane damping mechanism comprises an out-of-plane damper 9 and an out-of-plane lever 8, one end of the out-of-plane damper 9 is used for being connected with the bridge floor, the out-of-plane lever 8 is connected with the other end of the out-of-plane damper 9, and the out-of-plane lever 8 is hinged with the main lever 1 through a connecting rod 10 and used for amplifying and transmitting the out-of-plane displacement of the stay cable to the out-of-plane damper 9 after being connected with the bridge floor.

Specifically, the out-of-plane lever 8 is provided with a sixth hinge 12 hinged to the connecting rod 10, a seventh hinge 13 hinged to the bridge deck, and an eighth hinge 14 hinged to the out-of-plane damper 9, and the connecting rod 10 is hinged to the main lever 1 through a fifth hinge 11.

In this embodiment, the out-of-plane lever 8 is parallel to the main lever 1, and the out-of-plane lever 8 and the in-plane damper 3 are respectively located on both sides of the main lever 1; the connecting rod 10 is connected to the lower end of the main lever 1, the connecting rod 10 is horizontal in an initial state, one end of the connecting rod 10 is hinged to the lower end of the vibration transmission lever 103 in the main lever 1 through a fifth hinge part 11, and the other end of the connecting rod 10 is hinged to the lower end of the out-of-plane lever 8 through a sixth hinge part 12; the middle part of the out-of-plane lever 8 is hinged on a support 17 hinged with the in-plane lever 2 through a seventh hinge 13, the out-of-plane damper 9 is installed on the support 17, and the upper end of the out-of-plane lever 8 is connected with the out-of-plane damper 9.

The out-of-plane damper 9 is any one of an inertia mass eddy current damper, a viscous damper, a magneto-rheological damper and an inertia mass viscous shear damper, and can be selected according to actual needs; the out-of-plane damper 9 is hinge-mounted to the mount 17 by a ninth hinge 15, and the upper end of the out-of-plane lever 8 is hinge-coupled to the out-of-plane damper 9 by an eighth hinge 14. In this embodiment, the out-of-plane damper 9 is mounted in a housing 21, the housing 21 is fixed to the support 17, the upper end of the out-of-plane lever 8 extends into the housing 21, and the eighth hinge 14 and the ninth hinge 15 are both located in the housing 21.

When the stay cable generates the out-of-plane displacement, the main lever 1 rotates around the first hinged part 4, the lower end of the main lever 1 drives the out-of-plane lever 8 to rotate around the seventh hinged part 13 through the connecting rod 10, and then the out-of-plane damper 9 generates the damping force through the displacement generated inside the eighth hinged part 14, so that the out-of-plane damping effect is achieved.

In general, in order to make the in-plane damping mechanism and the out-of-plane damping mechanism as close to the bridge deck as possible, the distance from the fifth hinge 11 to the first hinge 4 is set to be smaller than the distance from the upper end of the main lever 1 to the first hinge 4, and at this time, the out-of-plane displacement of the stay cable is transmitted to the connecting rod 10 in a reduced manner, and in order to realize the amplified transmission of the out-of-plane displacement of the stay cable to the out-of-plane damper 9, the distance from the seventh hinge 13 to the sixth hinge 12 is set to be smaller than the distance from the seventh hinge 13 to the eighth hinge 14, and the ratio of the distance from the seventh hinge 13 to the eighth hinge 14 to the distance from the seventh hinge 13 to the sixth hinge 12 is larger than the ratio of the distance from the connecting end of the main lever 1 and the stay cable to the first hinge 4 to the distance from the fifth hinge 11 to the first hinge 4.

In this embodiment, each of the hinge members is a pin, specifically, the pin penetrates through two structural members to be hinged to each other and the two ends of the pin are provided with limiting blocks to realize the hinged connection of the two structural members, and the two supports 17 are respectively provided with a bearing seat 20 for connecting the support 17 and the in-plane lever 2, and the support 17 and the in-plane damper 3; in other embodiments, other hinge connection modes can be selected according to actual construction conditions.

Further, the position of the second hinge part 5 on the in-plane lever 2 can move along the length direction of the in-plane lever 2, and the position of the seventh hinge part 13 on the out-of-plane lever 8 can move along the length direction of the out-of-plane lever 8, so that the amplification coefficients of the in-plane damping mechanism and the out-of-plane damping mechanism can be adjusted to be adjusted according to actual vibration reduction requirements; specifically, a plurality of pin holes distributed along the length direction can be respectively formed in the in-plane lever 2 and the out-plane lever 8 for connecting pin shafts, and the pin shafts can penetrate through a certain pin hole to connect the in-plane lever 2 with the bridge surface and the out-plane lever 8 with the bridge surface according to the damping requirement during installation.

The problem of mutual influence of in-plane vibration and out-of-plane vibration of the stay cable is further analyzed, when the stay cable generates in-plane vibration, the main lever 1 can follow up and down to cause the connecting rod 10 to rotate around the sixth hinged part 12, and because the in-plane displacement of the stay cable is basically vertical to the connecting rod 10, the rotation amplitude of the out-of-plane lever 8 and the displacement of the out-of-plane damper 9 can be ignored, and the in-plane damping mechanism can not be influenced to play a role; in a similar way, when the stay cable vibrates out of the plane, the main lever 1 rotates around the first hinge part 4, the first hinge part 4 does not move basically, and the in-plane lever 2 and the in-plane damper 3 do not influence the out-of-plane damping mechanism to play a role.

In order to adapt to the relative displacement in the damper caused by the self vibration of the bridge or the vertical deflection of the main beam under the action of temperature and traffic load, an asymmetric stroke design is adopted in the stroke design of the in-plane damper 3 so as to meet the actual vibration attenuation stroke requirement and reduce the total length of the in-plane damper 3.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the use of the phrase "comprising a. -. Said" to define an element does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The utility model provides a suspension cable three-lever mass damping device which characterized in that includes:

a main lever (1) having one end connected to a stay cable;

the in-plane damping mechanism comprises an in-plane damper (3) with one end used for being connected with the bridge floor, an in-plane lever (2) is arranged at the other end of the in-plane damper (3), and the in-plane lever (2) is hinged to the main lever (1) and used for amplifying and transmitting the inner displacement of the stay cable surface to the in-plane damper (3) after being connected with the bridge floor;

the out-of-plane damping mechanism comprises an out-of-plane damper (9) with one end used for being connected with the bridge floor, an out-of-plane lever (8) is arranged at the other end of the out-of-plane damper (9), and the out-of-plane lever (8) is hinged to the main lever (1) through a connecting rod (1O) and used for amplifying and transmitting the out-of-plane displacement of the cable stayed plane to the out-of-plane damper (9) after being connected with the bridge floor.

2. The stay cable three-lever mass damping device according to claim 1, characterized in that: the inner lever (2) is provided with a first hinging piece (4) hinged with the main lever (1), a second hinging piece (5) hinged with the bridge deck and a third hinging piece (6) hinged with the inner damper (3), and the distance from the second hinging piece (5) to the first hinging piece (4) is smaller than the distance from the second hinging piece (5) to the third hinging piece (6).

3. The stay cable three-lever mass damping device according to claim 2, characterized in that: the main lever (1) is provided with a fifth hinged part (11) hinged with the connecting rod (10), and the distance from the fifth hinged part (11) to the first hinged part (4) is smaller than the distance from the end of the main lever (1) connected with the stay cable to the first hinged part (4).

4. A stay cable three-lever mass damping device according to claim 3, characterized in that: and a sixth hinged part (12) hinged with the connecting rod (10), a seventh hinged part (13) hinged with the bridge deck and an eighth hinged part (14) hinged with the out-of-plane damper (9) are arranged on the out-of-plane lever (8), and the distance from the seventh hinged part (13) to the sixth hinged part (12) is smaller than the distance from the seventh hinged part (13) to the eighth hinged part (14).

5. The stay cable three-lever mass damping device according to claim 4, wherein: the ratio of the distance from the seventh hinged part (13) to the eighth hinged part (14) to the distance from the seventh hinged part (13) to the sixth hinged part (12) is greater than the ratio of the distance from one end of the main lever (1) used for being connected with a stay cable to the first hinged part (4) to the distance from the fifth hinged part (11) to the first hinged part (4).

6. The stay cable three-lever mass damping device according to claim 1, characterized in that: the in-plane damper (3) is hinged with the bridge deck through a fourth hinge piece (7), and the hinge point is fixed.

7. The stay cable three-lever mass damping device according to claim 2, characterized in that: the position of the second articulation (5) on the in-plane lever (2) is movable in the length direction of the in-plane lever (2).

8. The stay cable three-lever mass damping device according to claim 4, wherein: the position of the seventh hinge (13) on the out-of-plane lever (8) is movable in the length direction of the out-of-plane lever (8).

9. The stay cable three-lever mass damping device according to claim 1, characterized in that: the in-plane damper (3) is designed for asymmetric travel.

10. The stay cable three-lever mass damping device according to claim 1, characterized in that: the out-of-plane damper (9) and the in-plane damper (3) are all one of an inerter eddy current damper, a viscous damper, a magneto-rheological damper and an inerter viscous shear damper.

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