JPH10220526A - Vibration damping device for structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To damp the horizontal vibration ranging from small to large amplitude, which occurs in a structure to a base construction. SOLUTION: A damping mechanism 20 of a vibration damping device is so constructed as to include a plastic deformation member 21 and an existing hydraulic damper 30. A main body 31 of the hydraulic damper 30 is secured to the plastic deformation member 21, which is then fastened to bridge piers, and rod sections 33 of the hydraulic damper 30 are connected to bridge girders to produce a structure which allows the plastic deformation member 21 to be deformed when the hydraulic damper 30 has made the specified stroke A3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device for a structure for damping a horizontal vibration of a structure with respect to a foundation structure, and more particularly to a hydraulic damper for damping the vibration and a plastic deformation member. The present invention relates to a configuration in which a plastically deformable member is plastically deformed after a damper operates for a predetermined stroke.

[0002]

2. Description of the Related Art Conventionally, as a vibration damping device for damping a horizontal vibration of a structure with respect to a foundation structure, a seismic isolation rubber bearing,
Plastic deformation members, hydraulic dampers and the like are practically used. The seismic isolation rubber bearing has a laminated rubber body in which a plurality of steel plates and rubber plates are alternately stacked up and down, and is disposed between the horizontal surface of the basic structure and the horizontal surface of the structure, and In addition to supporting vertical loads such as dead loads and loading loads on structures,
Horizontal vibration of the structure is suppressed through elastic deformation in the shear direction (horizontal direction).

The plastically deformable member is disposed between the base structure and the structure in the same manner as the above-mentioned seismic isolation rubber bearing, and causes the vibration of the structure relative to the base structure in the shear direction (horizontal direction).
Damping through plastic deformation to Conventionally, as a plastic deformation member, a member made of low-yield-point steel, a honeycomb plate member (honeycomb damper) having a plurality of holes, and the like are known. In addition, it is necessary to set the deformation load of the plastic deformation member to an appropriate value.

A hydraulic damper generally includes a main body filled with hydraulic pressure, a piston slidably fitted in the main body, a rod connected to the piston and projecting from the main body,
The main body includes a pair of oil chambers separated by a piston, an oil passage connecting the pair of oil chambers, an orifice provided in the oil passage, and the like. The connecting portion and the rod portion are connected to each other to attenuate the horizontal vibration of the structure with respect to the foundation structure.
In this hydraulic damper, horizontal vibrations can be attenuated from small to medium amplitude vibrations.

[0005] Further, an active control means for detecting a horizontal acceleration acting on the structure to obtain a vibration amplitude and changing a damping coefficient of a hydraulic damper based on the vibration amplitude is provided. Vibration damping devices capable of effectively attenuating horizontal vibrations have also been put to practical use.

Conventionally, a vibration damping device having the above-mentioned seismic isolation rubber bearing and a plastic deformation member, and a vibration damping device having a seismic isolation rubber bearing and a hydraulic damper have been put to practical use. In vibration damping devices equipped with seismic isolation rubber bearings and plastic deformation members, plastic deformation members that easily deform plastically with a small load are applied, and the plastic deformation members are plastically deformed together with the elastic deformation of the seismic isolation rubber bearings. Vibration of the structure with respect to the structure can be suppressed and attenuated (for example, a seismic isolation rubber bearing containing a lead plug). In a vibration damping device equipped with a seismic isolation rubber bearing and a hydraulic damper, an effect of suppressing and damping the horizontal vibration of the structure with respect to the foundation structure can be obtained. The damper can be restored to the initial position.

[0007]

However, the seismic isolation rubber bearing has a vibration suppressing effect but a low damping effect. Therefore, when a large earthquake occurs and the horizontal displacement of the structure increases, There is a risk that the seismic isolation rubber bearing will break. In addition, to improve seismic isolation performance, it is necessary to set the horizontal rigidity of the seismic isolation rubber bearing low, but with this, vibration due to horizontal load such as wind load is likely to occur, and May deteriorate the performance.

[0008] In order to increase the damping effect due to plastic deformation in the plastically deformable member, it is necessary to increase the rigidity of the plastically deformable member. However, the connection between the structure and the foundation structure also becomes rigid. The seismic force transmitted from the foundation structure to the structure increases, and the seismic isolation performance decreases. That is, the damping action and the seismic isolation performance are in a trade-off relationship.

Hydraulic dampers can be damped from small to medium amplitude vibrations. However, the existing hydraulic damper has a short working stroke (approximately 40 to 50 mm), so that a large-amplitude vibration generated by a large-scale earthquake is over-stretched and damaged, so that a damping effect cannot be expected. It is not impossible to apply a large hydraulic damper with a large stroke, but the cost of the vibration damping device becomes very high.

An object of the present invention is to provide a vibration damping device capable of damping horizontal vibrations of a structure with respect to a foundation structure from a vibration of a small amplitude to a vibration of a large amplitude. The purpose of the present invention is to provide a vibration damping device that effectively utilizes the function, to provide a vibration damping device that is advantageous in terms of manufacturing cost, and the like.

[0011]

According to a first aspect of the present invention, there is provided a vibration damping device for a structure for damping horizontal vibration of a structure with respect to a foundation structure. A hydraulic damper that attenuates vibration and a plastic deformation member that attenuates horizontal vibration of the structure through plastic deformation are provided.The main body of the hydraulic damper is fixed to the plastic deformation member, and the base structure and the structure The plastically deformable member is fixed to one side and the rod portion of the hydraulic damper is connected to the other side, so that the plastically deformable member is plastically deformed after the hydraulic damper operates for a predetermined stroke.

[0012] The main body of the hydraulic damper is fixed to the plastic deformation member, and the plastic deformation member is fixed to one of the foundation structure and the structure, and the rod portion of the hydraulic damper is connected to the other. The structural part is connected to the hydraulic damper via a plastic deformation member. When the structure vibrates in the horizontal direction with respect to the substructure, first, the hydraulic damper operates to attenuate the horizontal vibration of the structure. That is, in the case where the hydraulic damper does not operate for a predetermined stroke or more,
The vibration energy can be absorbed and attenuated by the hydraulic damper without plastically deforming the plastically deformable member. When the hydraulic damper operates for a predetermined stroke,
The plastically deformable member undergoes plastic deformation, absorbs vibration energy, and attenuates horizontal vibration of the structure.

That is, from a small-amplitude vibration to a predetermined stroke amplitude, the hydraulic damper effectively attenuates the vibration without increasing the rigidity between the structure and the substructure, and the plastic vibration is suppressed for the vibration beyond the predetermined stroke. Damping through plastic deformation of the deformable member. The rigidity of the connecting portion is increased by the plastic deformation member, but at an amplitude of a predetermined stroke or more. By changing the rigidity according to the amplitude, the resonance between the structure and the seismic force is effectively prevented, and the seismic force acting on the structure is reduced. Therefore, in the vibration damping device for a structure, it is possible to suppress the horizontal vibration of the structure with respect to the basic structure from a vibration having a small amplitude to a vibration having a large amplitude. Further, since the existing hydraulic damper having a small working stroke can be effectively used, a vibration damping device utilizing the damping performance of the hydraulic damper can be obtained, and the manufacturing cost is very advantageous.

According to a second aspect of the present invention, there is provided a vibration damping device for a structure.
According to the invention, a seismic isolation rubber bearing and / or a sliding bearing are provided between the substructure and the structure to vertically support the structure and to suppress horizontal vibration of the structure. That is, it is possible to further attenuate the horizontal vibration of the structure with respect to the basic structure. In addition to being able to cope with thermal expansion and thermal contraction of the structure, vertical vibration of the structure can also be suppressed. In addition, when the seismic isolation rubber bearing is provided, a restoring action of restoring the structure and the hydraulic damper to the initial position can be obtained. Other operations are the same as those of the first aspect.

According to a third aspect of the present invention, there is provided a vibration damping device for a structure.
Alternatively, in the invention of claim 2, a physical quantity detecting means for detecting a physical quantity related to a horizontal displacement acting on the structure, and a damping coefficient of the hydraulic damper based on a vibration amplitude obtained from a signal detected by the physical quantity detecting means. And active control means for changing. That is, by changing the damping coefficient of the hydraulic damper based on the vibration amplitude of the structure, it becomes possible to effectively attenuate the horizontal vibration of the structure by the hydraulic damper. Other claim 1 or 2
It has the same function as.

According to a fourth aspect of the present invention, there is provided a vibration damping device for a structure.
In the invention of the above, the active control means increases the damping coefficient of the hydraulic damper in a state of a small vibration amplitude such as that generated by vibration other than the earthquake, and the vibration amplitude generated by the vibration at the time of the earthquake is equal to or less than a predetermined value. In the state of the vibration amplitude, the damping coefficient of the hydraulic damper is set to an appropriate value exhibiting the damping function, and in the state of the vibration amplitude equal to or larger than the predetermined value, the damping coefficient of the hydraulic damper is controlled so as to increase the damping coefficient of the hydraulic damper. It is characterized by doing.

That is, in the case of vibration having a small amplitude such as that generated by vibration other than an earthquake, the damping coefficient of the hydraulic damper is increased so that the hydraulic damper functions as a stopper, and the structure is moved relative to the basic structure. Avoid vibrations and set the damping coefficient of the hydraulic damper to an appropriate value when the vibration amplitude is less than or equal to a predetermined value among the vibration amplitudes caused by earthquake vibration. In a state where the vibration amplitude is equal to or more than a predetermined value among vibration amplitudes generated by vibration during an earthquake, the hydraulic damper functions as a stopper by increasing the damping coefficient of the hydraulic damper. Thus, plastic deformation of the plastic deformation member can be promoted. After the hydraulic damper operates for a predetermined stroke, the vibration of the structure is damped through the plastic deformation of the plastic deformation member. Other effects are the same as those of the third aspect.

According to a fifth aspect of the present invention, there is provided a vibration damping device for a structure.
The invention according to any one of Items 4 to 4, wherein the structure is a bridge girder. Therefore, it is possible to suppress the horizontal vibration of the bridge girder from a vibration of a small amplitude to a vibration of a very large amplitude. In particular, even when a large earthquake occurs, the bridge girder falls from the pier (or abutment). The worst case of doing so can be avoided reliably. In addition, the same operation as any one of the first to fourth aspects is achieved.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment, the present invention is applied to a vibration damping device provided between a bridge girder (corresponding to a structure) and a pier (corresponding to a foundation structure) supporting a bridge girder in a bridge structure such as an expressway. This is an example of the case.
However, the bridge axis direction will be described as the Y direction, and the horizontal direction orthogonal to the bridge axis direction will be described as the X direction. As shown in FIGS. 1 and 2, the vibration damping device 10 for the bridge structure 1 includes a pair of bridge girders 2 and a bridge pier 8 that supports the ends of the bridge girders 2.
And the pier 8.

Each bridge girder 2 has a base structure 3 which is elongated in the Y direction and is laid on the upper surface of a base frame to which a plurality of steel members are connected, and is connected to the lower surface of the base structure 3 and which is elongated in the Y direction. It mainly comprises a pair of beam members 4 and a pair of side walls 5 erected at both ends of the upper surface of the base structure 3. Each of the bridge girders 2 has an acceleration sensor 61 (for detecting acceleration in the X direction). Physical quantity detecting means) and an acceleration sensor 62 (physical quantity detecting means) for detecting acceleration in the Y direction
(See FIG. 7). The ends of the pair of bridge girders 2 are fork joints 2 capable of coping with the thermal expansion and contraction of the bridge girders 2.
a. On the other hand, in the pier 8 supporting the ends of the pair of bridge girders 2, a support surface 9 having an area sufficient to support the ends of the pair of bridge girders 2 is formed on the upper surface thereof. A vibration damping device 10 is provided between the bridge member 9 and the beam member 4 of each bridge girder 2.

The vibration damping device 10 will be described. As shown in FIGS. 1 and 2, the vibration damping device 10 supports a vertical load such as a dead load or a vehicle load of the bridge girder 2 and a pair of seismic isolation rubber bearings 12 that suppress horizontal vibration. The bridge girder 2 is provided at the center in the X direction between the end of each bridge girder 2 and the pier 8 and has a plastic deformation member 21 and a hydraulic damper 30.
Damping mechanism 20 for damping the X-direction vibration of
Two sets of damping mechanisms 4 are provided at both ends in the X direction between the end of the bridge and the pier 8, and each have a plastic deformation member 41 and a hydraulic damper 50 and attenuate the vibration of the bridge girder 2 with respect to the pier 8 in the Y direction.
It has 0.

A pair of seismic isolation rubber bearings 12 are interposed between the lower end surfaces of the pair of beam members 4 of the bridge girder 2 and the support surface 9 of the pier 8, respectively. An end of the bridge girder 2 is supported by a pier 8. As shown in FIG. 3, each seismic isolation rubber bearing 12 alternately includes a pair of upper and lower steel substrates 13 and a plurality of steel plates 15 and hard rubber plates 16 provided between the pair of steel substrates 13. The laminated rubber body 14 and the steel substrate 1
3 and a lead plug 17 inserted in the center of the laminated rubber body 14 in the vertical direction. The upper steel substrate 13 is fixed to the beam member 4 of the bridge girder 2 with bolts, and the lower steel substrate 1
3 is bolted to the pier 8. Note that a steel plate for fixing the seismic isolation rubber bearing 12 and the mounting tables 24 and 42 of the damping mechanisms 20 and 40 to be described later is provided on the upper surface of the reinforced concrete bridge pier 8.

The damping mechanism 20 for damping the vibration of the bridge girder 2 in the X direction will be described. As shown in FIGS. 1 and 4 to 6, the plastic deformation member 21 is formed by connecting a plurality of plate members 22 (honeycomb dampers) each having a plurality of holes 23 formed in the X direction at predetermined intervals in the Y direction. Thus, it is fixed to the upper end of the mounting table 24 fixed to the support surface 9 of the pier 8.

A damper receiving member 25 for fixing the hydraulic damper 30 is connected to the upper end of the plastic deformation member 21 so as to be movable in the Y direction. X of the damper receiving member 25
On both sides in the direction, a pair of auxiliary members 6 extending from the pair of beam members 4 (see FIG. 1) of the bridge girder 2 to the opposite sides respectively face each other.
When the bridge girder 2 moves a predetermined stroke A3 (for example, A3 = 30 to 40 mm) in the X direction with respect to the pier 8 from the initial position of the bridge pier 8, the cushion rubber 27 fixed to the end surface 6a of the auxiliary member 6 as shown in FIG. When the end 26 of the damper receiving member 25 comes into contact with the pier 2 and the pier 2 further moves in the X direction, a load in the X direction acts on the plastic deformation member 21, and as shown in FIG. Plastically deforms.

In the hydraulic damper 30, the main body 31
And a pair of rod portions 33 extending outside both end portions of the main body portion 31
The operation stroke of which is the predetermined stroke A3
A slightly longer existing hydraulic damper is applied, and the main body 31
Are fixed to the damper receiving member 25 by the bracket 29, and the distal ends of the pair of rod portions 33 are fixedly connected to the end surfaces 6 a of the pair of auxiliary members 6 via the connecting member 34. The damping coefficient α of the hydraulic damper 30 is set such that the plastically deformable member 2
Active control means, which will be described later, controls the bridge girder 2 to effectively attenuate the vibration in the X direction without plastically deforming the bridge girder 1.

As shown in FIG. 7, a piston 32 is slidably fitted inside the main body 31, and the pair of rods 33 extend from the piston 32 and protrude to the outside of the main body 31. ing. An oil chamber 3 connected by an oil passage 36 is provided at a portion partitioned by a piston 32 inside the main body 31.
1a and 31b are formed. The oil passage 36 is provided with an electromagnetically controlled variable throttle valve 35 that is driven and controlled by a control unit 60, and the control unit 60 detects an acceleration in the X direction acting on the bridge beam 2 detected by the acceleration sensor 61. A vibration amplitude A of the bridge girder 2 in the X direction is obtained, and based on the vibration amplitude A, the throttle amount of the electromagnetically controlled variable throttle valve 35 is controlled to change the damping coefficient α of the hydraulic damper 30. is there. The control unit 60 and the electromagnetically controlled variable throttle valve 35 correspond to active control means.

Using the vibration amplitude A of the bridge girder 2 in the X direction as a parameter, the damping coefficient α of the hydraulic damper 30 is actively controlled by the control unit 60 so as to become a curve a in FIG. When the vibration amplitude A of the bridge girder 2 is 0, the damping coefficient α is set to a large α1, and when the vibration amplitude A is 0 to A1, the damping coefficient α decreases substantially in proportion to the increase of the vibration amplitude A. When A is A1 to A2, the damping coefficient α is maintained at an appropriate substantially constant value for exhibiting damping performance, and when the vibration amplitude A is equal to or larger than A2 (including A3), the damping coefficient α becomes the vibration amplitude A
Increases almost in proportion to the increase in Where, for example,
A1 = 5mm, A2 = 20-30mm, A3 = 30-40mm
It is.

That is, the active control means generates a small vibration amplitude A (A = 0 to 0) which is generated by vibration other than the earthquake.
In the state of A1), the damping coefficient α of the hydraulic damper 30 is increased to make the hydraulic damper 30 function as a stopper, and the vibration amplitude of a predetermined value A2 or less among the vibration amplitudes A generated by the vibration at the time of the earthquake. In the state of A (A = A1 to A2), the vibration of the bridge girder 2 is effectively damped by setting the damping coefficient α of the hydraulic damper 30 to an appropriate value exhibiting the damping function, and In the state of the vibration amplitude A, the damping coefficient α of the hydraulic damper 30 is increased to make the hydraulic damper 30 function as a stopper so that the vibration load is effectively transmitted to the plastic deformation member 21. .

As shown in FIGS. 1 and 2, each of the pair of damping mechanisms 40 for damping the Y-direction vibration of the bridge girder 2 has a plastic deformation member 41 and a hydraulic damper 50. As shown in FIG. 7, the hydraulic damper 50 includes a main body 51, a piston 5
2, one pair of rod portions 53, oil chambers 51a, 51b, oil passage 5
6. It has a variable throttle valve 55 of an electromagnetic control type, and detects acceleration in the Y direction acting on the bridge girder 2 by the acceleration sensor 62,
The throttle amount of the electromagnetically controlled variable throttle valve 55 is controlled by the control unit 60 based on the vibration amplitude obtained from the acceleration, and the damping coefficient α of the hydraulic damper 50 is set in the same manner as in FIG.
It is configured to change with the characteristics shown in FIG. The control unit 60 and the electromagnetically controlled variable throttle valve 55 correspond to active control means.

In each damping mechanism 40, the plastic deformation member 4
1 is fixed to the upper surface of the mounting table 42, and a damper receiving member 45 is movably connected to the upper end portion of the plastic deformation member 41 in the X direction, and a hydraulic damper 50 is attached to the damper receiving member 45.
Is fixed. A pair of auxiliary members 7 extend in the X direction from the lower end of the side surface of the beam member 4 of the bridge girder 2, and the distal ends of the rod portions 53 of the hydraulic damper 50 are fixedly connected to the pair of auxiliary members 7, respectively. I have. Since the structure is the same as that of the damping mechanism 20, other description is omitted.

The operation and effect of the vibration damping device 10 will be described. Small vibration amplitude A (A = 0 to A1) such as that generated by vibration other than earthquakes, such as daily vibrations during vehicle running
In the state (1), since the damping coefficient α of the hydraulic damper 30 controlled by the active control means is large, the two sets of hydraulic dampers 30 corresponding to both ends of the bridge girder 2 can function as stoppers, and the seismic isolation rubber bearing can be used. Since the horizontal rigidity of the bridge 12 is weak, small vibration of the bridge girder 2 in the X direction can be suppressed.

Further, among the vibration amplitudes A generated by the vibration at the time of the earthquake, the vibration amplitudes A (A = A1 to A2) which are equal to or less than the predetermined value A2.
In the state A2), the damping coefficient α of the hydraulic damper 30 controlled by the active control means has an appropriate value for exhibiting a damping function, and the plastically deformable member 21 is not plastically deformed, and the hydraulic damper 30 and the seismic isolation The rubber bearing 12 can effectively attenuate the vibration of the bridge girder 2 in the X direction.

Vibration amplitude A generated by vibration during an earthquake
In the state of the vibration amplitude A equal to or larger than the predetermined value A2, the damping coefficient α of the hydraulic damper 30 controlled by the active control means increases again, and the hydraulic damper 30 functions as a stopper, and the plastic deformation member 21 The deformation can be promoted, and the vibration of the bridge girder 2 in the X direction can be attenuated through the plastic deformation of the plastic deformation member 21.

That is, from the small amplitude vibration, the predetermined stroke A
2 can be attenuated by the hydraulic damper 30 and large-amplitude vibration of a predetermined stroke A2 or more can be attenuated through plastic deformation of the plastic deformation member 21. Accordingly, it is possible to suppress the vibration of the bridge girder 2 in the X direction with respect to the pier 8. Therefore, the existing hydraulic damper 30 having an operation stroke that is not so large can be effectively used, so that the damping performance of the hydraulic damper 30 is utilized and the manufacturing cost is very advantageous.

Further, since the seismic isolation rubber bearing 12 for suppressing the horizontal vibration of the bridge girder 2 is provided between the bridge pier 8 and the bridge girder 2, in cooperation with the hydraulic damper 30 and the plastic deformation member 21,
The vibration in the X direction of the bridge girder 2 with respect to the pier 8 can be further attenuated. In addition, the provision of the seismic isolation rubber bearing 12 provides a restoring effect of restoring the bridge girder 2 and the hydraulic damper 30 to the initial position after the vibration with the vibration amplitude A equal to or less than the predetermined value A2. In addition to coping with heat shrinkage, vertical vibration of the bridge girder 2 can also be suppressed.

Further, an acceleration sensor 61 for detecting the acceleration in the X direction acting on the bridge girder 2 and the hydraulic damper 30 based on the vibration amplitude A in the X direction of the bridge girder 2 obtained from the acceleration detected by the acceleration sensor 61. Active control means for changing the damping coefficient α is provided, and the active control means controls the damping coefficient α of the hydraulic damper 30 with respect to the vibration amplitude A in the X direction so as to become the curve a in FIG. The vibration in the X direction can be effectively attenuated.

Specifically, in a state of a small vibration amplitude A (A = 0 to A1) such as is generated by vibration other than an earthquake, the damping coefficient α of the hydraulic damper 30 is increased to increase the bridge girder 2.
Is not vibrated with respect to the pier 8, and when the vibration amplitude A is less than or equal to a predetermined value A2 (A = A1 to A2) among the vibration amplitudes A generated by vibration during an earthquake, the hydraulic damper 3
By setting the damping coefficient α of 0 to an appropriate value that exhibits the damping function, the vibration of the bridge girder 2 is effectively damped, and the vibration amplitude A that is generated by the vibration at the time of the earthquake has a predetermined value A2 or more. In the state of the vibration amplitude A, the damping coefficient α of the hydraulic damper 30
, The plastic deformation of the plastic deformation member 21 is promoted, the buffering is also achieved by the collision between the damper receiving member 25 and the cushion rubber 27, and the bridge girder 2 is effectively vibrated through the plastic deformation of the plastic deformation member 21. Can be attenuated.

When the bridge girder 2 vibrates relative to the pier 8 in the Y direction, four sets of damping mechanisms 40 corresponding to both ends of the bridge girder 2 function in the same manner as the damping mechanism 20, and Similarly, an operation and effect of suppressing the vibration of the bridge girder 2 in the Y direction can be obtained. When the vibration damping device 10 having the damping mechanisms 20 and 40 is applied as the vibration damping device for damping the horizontal vibration of the bridge girder 2 with respect to the bridge pier 8 as in the present embodiment, even if a large earthquake occurs, , Bridge girder 2 is pier 8 (or abutment)
It is possible to reliably avoid the worst case of falling from the vehicle.

Next, a vibration damping device according to another embodiment will be described. First Alternative Embodiment—See FIG. 9 A vibration damping device 10A according to a first alternative embodiment is a vibration damping device 10A.
In this embodiment, a damping mechanism 40A is provided instead of the damping mechanism 40 for damping the vibration of the bridge girder 2 with respect to the pier 8 in the Y direction. In the damping mechanism 40A, the plastic deformation member 7
0 is fixed to the lower surface of the beam member 4 of the bridge girder 2, the damper receiving member 71 is connected to the lower end portion of the plastic deformation member 70 so as to be movable only in the X direction, and the lower surface of the damper receiving member 71 has the hydraulic damper 72. The main body 75 is fixed by a bracket 76.

The hydraulic damper 72 has a main body 75 and a rod 73 extending toward the pier 8. The tip of the rod 73 is fixedly connected to the side surface 8 a of the pier 8 via a connecting member 74. I have. A cushioning rubber 27 </ b> A with which the end of the damper receiving member 71 abuts is attached to the side surface 8 a of the pier 8. The damping mechanism 40A of the vibration damping device 10A
Functions and effects similar to those of the damping mechanism 40 of the above-described embodiment are achieved.

Second Embodiment: See FIGS. 10 to 12 In a second embodiment, the present invention is applied to a vibration damping device for damping a horizontal vibration of a structure 84 such as a building with respect to a foundation structure 82. This is an example in the case where is applied. This vibration damping device 10
In B, a plurality of seismic isolation rubber bearings 12B and two sets of damping mechanisms 80 for damping the X-direction vibration of the structure 84 with respect to the base structure 82 are provided between the structure 84 and the base structure 82.
And two sets of damping mechanisms 81 for damping the vibration of the structure 84 in the Y direction with respect to the basic structure 82.

The damping mechanisms 80 and 81 have the same structure except that the direction of damping the vibration of the structure 84 is different. Therefore, the damping mechanism 80 will be described, and the damping mechanism 80 will have substantially the same structure as the damping mechanism 20 of the above embodiment. Therefore, the same components as those of the damping mechanism 20 are denoted by the same reference numerals, and description thereof is omitted. As shown in FIG. 12, in each damping mechanism 80, a pair of auxiliary members 85 project downward from the lower end of the base member 83 of the structure 84. The tip portions of a pair of rod portions 30 are fixedly connected to each other. The plastic deformation member 21 is fixed to the foundation structure 82.

According to the vibration damping device 10B, it is possible to suppress the horizontal vibration of the structure 84 with respect to the basic structure 82 from the vibration of the small amplitude to the vibration of the large amplitude.
In addition, since the existing hydraulic damper 30 whose operating stroke is not so large can be effectively used, the damping performance of the hydraulic damper 30 is utilized, and the manufacturing cost is very advantageous. Other operations and effects similar to those of the main embodiment are provided.

Third Alternative Embodiment—See FIGS. 13 and 14 A vibration damping device 10 C according to a third alternative embodiment includes a building 8.
It has a plurality of damping mechanisms 90 disposed between 7, 88, and damps horizontal vibrations of the buildings 87, 88. In each damping mechanism 90, the plastic deformation member 91 is fixed to the upper end of a mounting member 89 fixed to one of the buildings 87, and a damper receiving member 92 faces the upper ends of the plastic deformation member 91 to the buildings 87 and 88. It is connected movably in the horizontal direction perpendicular to the direction.

The damper receiving member 92 includes a hydraulic damper 99.
Main body 94 is fixed by a bracket 95, and the tip of the rod 96 of the hydraulic damper 99 is connected to the other building 8.
8 is fixedly connected to the side surface of the base member 8 via a connecting member 97. A buffer rubber 93 is attached to a side surface of the other building 88, with which an end of a damper receiving member 92 abuts. In the vibration damping device 10C, different vibration amplitudes generated in the buildings 87 and 88 are used,
The vibration of the buildings 87 and 88 is suppressed in the horizontal direction, and the same operations and effects as those of the above-described embodiment are achieved.

In the above-described embodiment and the first to third alternative embodiments, the plastic deformation member is not limited to the one disclosed in the above-described embodiment.
Various things are applicable. In the active control means, the damping coefficient α of the hydraulic damper 30 is controlled so as to have various other characteristics such as controlling the damping coefficient α of the hydraulic damper 30 to be a curve b shown by a chain line in FIG. It is also possible.

Instead of the acceleration sensors 61 and 62, a physical quantity detecting sensor such as a speed sensor capable of detecting a horizontal speed or a displacement sensor capable of detecting a horizontal displacement is provided. The damping coefficient of the hydraulic damper may be changed based on the vibration amplitude obtained from the obtained signal. Although not shown, in the above-described embodiment and the first and second alternative embodiments, vibration is attenuated through friction with a base structure or a structure instead of the seismic isolation rubber bearings 12 and 12B. Sliding bearings may be provided, and these sliding bearings may be seismic-isolated rubber bearings 12,12.
It may be provided together with B.

[0047]

According to the structure vibration damping device of the first aspect,
If the structure vibrates horizontally with respect to the foundation structure,
First, the hydraulic damper operates to attenuate the horizontal vibration of the structure. That is, in the vibration in which the hydraulic damper does not operate for a predetermined stroke or more, the plastic deformation member is not plastically deformed, the vibration energy is absorbed and attenuated by the hydraulic damper, and when the hydraulic damper operates for a predetermined stroke,
Next, the plastic deformation member plastically deforms, absorbs vibration energy, and attenuates horizontal vibration of the structure. That is, it is possible to suppress the horizontal vibration of the structure with respect to the basic structure from a small amplitude vibration to a large amplitude vibration. Therefore, the existing hydraulic damper having an operation stroke that is not so large can be effectively used, and a vibration damping device utilizing the damping performance of the hydraulic damper can be obtained, which is very advantageous in terms of manufacturing cost.

According to the vibration damping device for a structure of the second aspect, the same effect as that of the first aspect is obtained, but the structure is supported vertically between the basic structure and the structure, and the structure is supported. Since the seismic isolation rubber bearing and / or the sliding bearing for suppressing the horizontal vibration are provided, the horizontal vibration of the structure with respect to the foundation structure can be further damped. In particular, in the case of small-amplitude vibration of a structure, vibration energy can be absorbed and suppressed by the seismic isolation rubber bearing without operating the hydraulic damper. In addition to being able to cope with thermal expansion and thermal contraction of the structure, vertical vibration of the structure can also be suppressed.
In addition, when the seismic isolation rubber bearing is provided, a restoring action of restoring the structure and the hydraulic damper to the initial position can be obtained.

According to the vibration damping device for a structure of the third aspect, the same effect as that of the first or second aspect is obtained, but physical quantity detecting means for detecting a physical quantity related to a horizontal displacement acting on the structure. And active control means for changing the damping coefficient of the hydraulic damper based on the vibration amplitude obtained from the signal detected by the physical quantity detecting means, so that the damping coefficient of the hydraulic damper is determined based on the vibration amplitude of the structure. By making the change, the horizontal vibration of the structure can be effectively damped by the hydraulic damper.

According to the vibration damping device for a structure of the fourth aspect, the same effect as that of the third aspect is obtained, but the damping coefficient of the hydraulic damper is increased when the vibration has a small amplitude such as that generated by vibration other than the earthquake. By doing so, the hydraulic damper functions as a stopper, prevents the structure from vibrating with respect to the foundation structure, and in a state of a vibration amplitude equal to or less than a predetermined value among vibration amplitudes generated by vibration during an earthquake, By setting the damping coefficient of the hydraulic damper to an appropriate value, the vibration of the structure is effectively attenuated by the hydraulic damper. By increasing the damping coefficient of the hydraulic damper, it is possible to make the hydraulic damper function as a stopper and promote plastic deformation of the plastic deformation member. After the hydraulic damper operates for a predetermined stroke, the vibration of the structure can be damped through the plastic deformation of the plastic deformation member.

According to the vibration damping device for a structure of the fifth aspect, the same effect as that of any one of the first to fourth aspects can be obtained. However, since the structure is a bridge girder, the vibration of a small amplitude can be extremely reduced. The horizontal vibration of the bridge girder can be damped over large amplitude vibrations, and in particular, even in the event of a large earthquake, the worst-case situation where the bridge girder falls from the pier (or abutment) can be reliably avoided. It becomes possible to do.

[Brief description of the drawings]

FIG. 1 is a side view of a bridge structure having a vibration damping device according to an embodiment of the present invention, viewed from a Y direction.

FIG. 2 is a side view of the bridge structure of FIG. 1 viewed from an X direction.

FIG. 3 is a partial sectional perspective view of a seismic isolation rubber bearing.

FIG. 4 is an operation explanatory view of a damping mechanism (initial state) of the vibration damping device.

FIG. 5 is an operation explanatory view of the damping mechanism (after the operation of the hydraulic damper).

FIG. 6 is an operation explanatory view of the damping mechanism (after plastic deformation of the plastic deformation member).

FIG. 7 is a sectional view of a hydraulic damper.

FIG. 8 is a diagram showing characteristics of a damping coefficient of a hydraulic damper with respect to a vibration amplitude.

FIG. 9 is an enlarged view of a main part of a vibration damping device according to a first different embodiment.

FIG. 10 is a plan view of a vibration damping device according to a second different embodiment.

FIG. 11 is a side view of the vibration damping device of FIG.

FIG. 12 is an enlarged view of a main part of the vibration damping device of FIG. 11;

FIG. 13 is a side view of a building provided with a vibration damping device according to a third different embodiment.

FIG. 14 is an enlarged view of a main part of the vibration damping device of FIG.

[Explanation of symbols]

 2 Bridge girder 8 Bridge pier 10, 10A, 10B, 10C Vibration damper 12, 12B Seismic isolation rubber bearing 21, 41, 70, 91 Plastic deformation member 30, 50, 72, 99 Hydraulic damper 31, 51, 75, 94 Main body 33 , 53, 73, 96 Rod part 35, 55 Electromagnetically controlled variable throttle valve 60 Control unit 61, 62 Acceleration sensor (physical quantity detecting means)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Junichi Hachibe 2-1-1, Minamisuna, Koto-ku, Tokyo Kawasaki Heavy Industries, Ltd. Tokyo Design Office (72) Inventor Hidekazu Kobayashi 1st Kawasakicho, Akashi-shi, Hyogo No. 1 Kawasaki Heavy Industries, Ltd. Akashi Technical Research Institute Co., Ltd. (72) Inventor Toshio Saito 1-1, Kawasaki-cho, Akashi-shi, Hyogo Prefecture Kawasaki Heavy Industries Akashi Technical Research Institute Co., Ltd. No. 1 Kawasaki Heavy Industries Tokyo Design Office

Claims (5)

[Claims] 1. A vibration damping device for a structure for damping horizontal vibration of a structure with respect to a basic structure, comprising: a hydraulic damper for damping horizontal vibration of the structure; A plastic deformation member that attenuates vibrations through plastic deformation, a main body of the hydraulic damper is fixed to the plastic deformation member, and a plastic deformation member is fixed to one of the foundation structure and the structure, and a hydraulic pressure is fixed to the other. A vibration damping device for a structure, wherein a rod portion of a damper is connected, and a plastically deformable member is plastically deformed after the hydraulic damper operates for a predetermined stroke. 2. A seismic isolation rubber bearing and / or a sliding bearing for supporting the structure in a vertical direction and suppressing horizontal vibration of the structure between the foundation structure and the structure. The structure vibration damping device according to claim 1, wherein 3. A physical quantity detecting means for detecting a physical quantity related to a horizontal displacement acting on the structure, and a damping coefficient of a hydraulic damper based on a vibration amplitude obtained from a signal detected by the physical quantity detecting means. The structure vibration damping device according to claim 1 or 2, further comprising: an active control unit that changes the active control unit. 4. The active control means increases a damping coefficient of a hydraulic damper in a state of a small vibration amplitude generated by vibration other than an earthquake, and sets a predetermined value among vibration amplitudes generated by vibration during an earthquake. In the following vibration amplitude state, the damping coefficient of the hydraulic damper is set to an appropriate value for exhibiting the damping function, and in the state of vibration amplitude equal to or larger than the predetermined value, the damping coefficient of the hydraulic damper is increased so as to increase the damping coefficient of the hydraulic damper. The structure vibration damping device according to claim 3, wherein: 5. The structure vibration damping device according to claim 1, wherein the structure is a bridge girder.