JP2000045561A - Brace damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To damp not only large vibrations at the time of a great earthquake but also comparatively small vibrations. SOLUTION: A brace damper device 19 has a hydraulic damper 23 damping comparatively large vibrations and a damping mechanism 26 damping comparatively small vibrations. The damping mechanism 26 has a damping elastic body 34 generating damping force by infinitesimal displacement. When vibrations having large amplitude such as an earthquake are propagated to first and second braces 24, 27 at that time, comparatively large vibrations can be damped by the damping force of the hydraulic damper 23. When comparatively small vibrational energy such as a small earthquake, traffic vibrations, etc., is propagated to the first and second braces 24, 27, comparatively small vibrations are damped by the damping force of the damping elastic body 34 when the braces are displaced, and the micro-vibrations of a structure can be damped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brace damper, and more particularly to a brace damper configured to be able to absorb a vibration of a structure due to an earthquake and to absorb a traffic vibration.

[0002]

2. Description of the Related Art As a means for improving the seismic resistance of structures such as buildings and houses, a frame is mounted at a diagonal position of a frame in order to absorb energy for plastically deforming the frame between columns or beams. A damper is attached to the brace to be absorbed to absorb vibration energy of a large earthquake, and a damping structure for damping the frame is being developed.

As a conventional brace damper used for such a vibration damping structure, for example, there is a structure disclosed in Japanese Utility Model Laid-Open Publication No. Hei 7-23108. In this publication, a hydraulic damper including a cylinder, a piston, a check valve, and the like is provided on a brace formed at a diagonal position of a frame. The brace damper configured as described above has a structure in which vibration energy such as a large earthquake is absorbed by a damping force caused by a relative displacement between a piston and a cylinder of the hydraulic damper.

[0004]

However, in a brace damper using a hydraulic damper for the brace portion of a building as described above, vibration is damped by a damping force generated by the hydraulic damper against a large shake such as a large earthquake. It is effective because it can be used, but the oil compression property and the sliding resistance of the oil seal,
There is a problem that the influence of the static friction is large, so that it does not act as a damping means, but becomes a mere elastic body so that vibration cannot be reduced.

[0005] Therefore, in the conventional brace damper, the damping force generated by the hydraulic damper is set so as to be able to absorb the vibration energy at the time of a large earthquake, so that it is caused by a relatively small earthquake or traffic of a vehicle such as an automobile. When a traffic vibration occurs, a stroke sufficient to generate a damping force by the hydraulic damper cannot be obtained, and the vibration having a small amplitude cannot be effectively damped.

That is, the hydraulic damper applied to the brace damper has a characteristic of absorbing a large amount of energy such as an earthquake, and therefore cannot sufficiently absorb a vibration having a high frequency such as a traffic vibration and a small amplitude. . Therefore,
An object of the present invention is to provide a brace damper that solves the above-mentioned problems.

[0007]

In order to solve the above problems, the present invention has the following features. Claim 1
The described invention has a damping elastic body for generating a damping force with a minute displacement in a brace damper provided with a damper for damping vibration in a brace attached at a predetermined angle in a space formed by columns and beams. A damping mechanism is provided in series with the damper.

Therefore, according to the first aspect of the present invention, since a damping mechanism having a damping elastic body for generating a damping force by a minute displacement is provided in series with the damper, vibration having a large amplitude such as an earthquake is transmitted to the brace. In this case, a relatively large vibration can be damped by the damping force of the damper,
When the brace is displaced by a relatively small vibration energy such as a small earthquake or traffic vibration, a relatively small vibration can be damped by the damping force of the damping elastic body, and the minute vibration of the structure can be suppressed.

According to a second aspect of the present invention, there is provided a brace damper in which a plurality of braces connected to a frame formed by columns and beams are attached at a predetermined angle.
A damping mechanism having a damping elastic body for generating a damping force with a minute displacement is provided for each of the plurality of braces. Therefore, according to the second aspect of the present invention, since a damping mechanism having a damping elastic body for generating a damping force with a minute displacement is provided for each of the plurality of braces, vibration having a large amplitude such as an earthquake due to the plurality of damping elastic bodies is provided. And relatively small vibrations such as small earthquakes and traffic vibrations can be suppressed.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a structure to which an embodiment of a brace damper according to the present invention is attached. As shown in FIG. 1, the structure 11 is composed of a steel frame combined with a steel frame on a first-order frame 12 composed of steel frames.
A steel structure in which stacked floor framework 13, the pillars 14 of the first floor framework 12 (14 _1, 14 ₂₎ is basis 15 (15 ₁ to
15 ₂ ), and the beam 16 of the first floor frame 12 is
(14 ₁ , 14 ₂ ) are fastened so as to bridge between the upper ends. And the pillar 17 (17 ₁ , 1
7 ₂ ) is fastened to the beam 16, and the beam 18 of the second-order frame 3 is fastened so as to bridge between the upper ends of the columns 17 (17 ₁ , 17 ₂ ). In FIG. 1, an outer wall panel, an inner wall panel, a ceiling plate, and the like are omitted.

A brace damper device 19 is mounted on a diagonal line of the first frame 12. The brace damper device 19 is composed of a column 14 _{1 of the} frame 12 on the first floor and a foundation 15.
₁ attached to a first corner formed by
And gussets 20 are mounted between the second gusset 21 which is attached to a second corner portion formed by the pillars 14 ₂ and beam 16.

[0012] The brace damper device 19 is a frame 1 of the first floor.
2, for example, when a displacement in the direction A is applied to the first-order frame 12, a tensile load is applied to the brace damper device 19. When a displacement in the direction B is applied to the first-story frame 12, a compressive load acts on the brace damper device 19.

As described above, when the vibrations in the directions A and B are input to the structure 11, a compressive load and a tensile load act on the brace damper device 19 alternately. Therefore, the brace damper device 19 absorbs the vibration energy and attenuates the vibration of the first-order frame 12 to prevent the vibration transmitted to the second-order frame 13 provided above the first-order frame 12 from being amplified.

The brace damper device 19 includes a first-story frame 1
A hydraulic damper 23 that generates a damping force when vibrations in directions A and B are input to the hydraulic damper 23;
A first brace 24 mounted at a predetermined inclination angle between 3a and the first gusset 20 is arranged in series with the hydraulic damper 23 and connected to a piston rod 23b of the hydraulic damper 23 via a connecting rod 25. Damping mechanism 26 and damping mechanism 2
6 and a second brace 27 mounted between the second gusset 21 at a predetermined inclination angle.

The damping force mechanism 26 is configured to have a damping elastic body that generates damping force with a small displacement as described later, and is used when the brace is displaced by relatively small vibration energy such as a small earthquake or traffic vibration. Also, a relatively small vibration energy can be effectively absorbed by generating a damping force. Here, the configuration of the damping mechanism 26 will be described.

FIG. 2A is a plan view showing the damping mechanism 26 in an enlarged manner. FIG. 2B is a cross-sectional view taken along a line AA in FIG.
It is a longitudinal cross-sectional view along a line. As shown in FIGS. 2A and 2B, the damping mechanism 26 includes a base 3 formed in a disk shape.
2 and a connecting member 33 having an inverted T-shaped cross section
And a damping elastic body 34 that generates a damping force by a minute displacement, and a disk-shaped cover 35 that covers an upper opening of the base 32.

The base 32 has a housing portion 32a formed in a cup shape, and a shaft 32b projecting downward from the bottom surface of the housing portion 32a. The accommodation portion 32a accommodates the damping elastic body 34, and a screw portion 32c to which the cover 35 is screwed is provided on the outer periphery. The shaft 32b of the base 32 is
It is connected to the piston rod 23b of the hydraulic damper 23 via the connecting rod 25.

The damping elastic body 34 is made of, for example, a high damping rubber or the like which generates a high damping force with a small displacement.
The storage portion 32 is inserted into the storage portion 32a of the base 32 and
The cover 35 is screwed into the threaded portion 32c of FIG. 3A to be mounted in a state where the axial movement is restricted. Further, the damping elastic body 34 is formed so that the upper and lower surfaces are housed in a state where there is no gap, while the outer periphery is formed to have a smaller diameter than the inner periphery of the base 32, and the inner wall 32 d of the housing portion 32 a is formed. A gap 31 is provided between the damping elastic body 34 and the outer periphery.
This is because when an axial load is applied to the damping elastic body 34, the damping elastic body 34 is compressed in a flat state and the outer peripheral portion is deformed outward, thereby generating a high damping force.

The connecting member 33 includes a housing 32 for the base 32.
and a shaft 33b protruding upward from the center of the upper surface of the disk portion 33a. Connection member 3
The third disk portion 33a is inserted so as to be embedded in the damping elastic body 34, and includes a lower surface 33a ₁ and an upper surface 33a.
_{2. The} outer periphery 33a ₃ is accommodated in the accommodating portion 32a of the base 32 while being covered with the damping elastic body 34. Further, the shaft 33 b of the connection member 33 is inserted into a shaft hole 35 a penetrating through the central portion of the cover 35 and connected to the lower end of the second brace 27.

[0020] Thus, compressive load on brace damper device 19, pulling the load is a load acts on the connecting member 33 acts, a lower surface 33a ₁ or the upper surface 33a ₂ damping elastic body of the disk portion 33a in accordance with the load acting direction By pressing and deforming, a high damping force is generated. Since the inner diameter r1 of the shaft hole 35a is sufficiently smaller than the outer diameter r2 of the damping elastic body 34, even if the connecting member 33 receives a pulling force, the damping elastic body 34 is located at the center of the cover 35. There is no escape from the annular gap formed between the provided shaft hole 35a and the shaft 33b of the connection member 33.

As shown in FIG. 1, a brace damper device 19 and a damping mechanism 26 are provided with a first brace 24 and a second brace 27 mounted diagonally on the first frame 12.
For example, when a displacement in the direction A is applied to the first-story frame 12, a tensile load is applied to the brace damper device 19 and the damping mechanism 26.
When a displacement in the direction B is applied to the first-story frame 12, a compressive load acts on the brace damper device 19 and the damping mechanism 26.

At this time, when a vibration having a large amplitude such as an earthquake is transmitted to the first and second braces 24 and 27, a relatively large vibration can be suppressed by the damping force of the hydraulic damper 23. When relatively small vibration energy such as a small earthquake or traffic vibration is transmitted to the first and second braces 24 and 27, the relatively small vibration is attenuated by the damping force of the damping elastic body 34, and Can be suppressed.

FIG. 3A is a longitudinal sectional view showing a state where the micro-vibration of the damping mechanism 26 is applied or a stationary state. Also,
FIG. 3B is a longitudinal sectional view showing a state in which a compressive load of the damping mechanism 26 is applied. FIG. 3C shows the damping mechanism 2.
FIG. 6 is a longitudinal sectional view showing a state where a tensile load of No. 6 is applied. As shown in FIG. 3A, when traffic vibrations and the like are propagated and the first-story frame 12 is slightly shaken, the vibration energy is absorbed by the damping elastic body 34 incorporated in the damping mechanism 26 and the building is To prevent the vibrations from being amplified. At this time, the hydraulic damper 23 does not operate and does not generate a damping force.

Next, as shown in FIG. 3 (B), when the building shakes greatly due to a large earthquake or the like, a large compressive displacement occurs in the damping mechanism 26, and the damping elastic body 34 is connected to the disk 33a of the connecting member 33. Thereby, the base 32 is pressed against the housing portion 32a. As a result, the damping elastic body 34 is
It is compressed between the accommodating portion 32a of a lower surface 33a ₁ Tobesu 32. Then, the outer peripheral portion of the damping elastic body 34 expands outward and comes into contact with the inner wall 32d of the housing portion 32a.

In this case, the outer peripheral portion of the damping elastic body 34 is in contact with the inner wall 32d of the housing portion 32a, and cannot be further deformed. In this state, the damping elastic body 3
When a load is applied to the damper 4, the compression load exceeds the allowable range of the compression elastic deformation of the damping elastic body 34, so that the damping mechanism 26 is apparently a rigid member similar to the normal first and second braces 24 and 27. .

Therefore, the force transmitted from the structure through the first and second braces 24, 27 is transmitted to the hydraulic damper 23, and the vibration energy of the structure is absorbed by the hydraulic damping force, and the amplification of the vibration is suppressed. Further, as shown in FIG. 3 (C), when a large extension displacement acts on the damping mechanism 26, the damping elastic body 34 is pressed against the cover 35 by the disk portion 33a of the connecting member 33. As a result, the damping elastic body 34 is attached to the upper surface 33a ₂ of the disk portion 33a and the cover 35a.
Compressed between Then, the outer peripheral portion of the damping elastic body 34 expands outward and comes into contact with the inner wall 32d of the housing portion 32a.

In this case, the outer peripheral portion of the damping elastic body 34 is in contact with the inner wall 32d of the housing portion 32a, and cannot be further deformed. In this state, the damping elastic body 3
4, a tensile load is applied to the damping elastic body 34.
Since the compression elastic deformation exceeds the allowable range, the damping mechanism 26 is apparently a rigid member similar to the normal first and second braces 24 and 27 as in compression.

Therefore, the first and second braces 24, 27
The force transmitted from the structure is transmitted to the hydraulic damper 23, and the vibration energy of the structure is absorbed by the hydraulic damping force, and the amplification of the vibration is suppressed. In the above embodiment, the brace damper configured to attenuate the vibration caused by the earthquake by the hydraulic damper 23 has been described as an example.
The invention is not limited to this, but instead of the hydraulic damper 23, a steel rod damper that plastically deforms a steel material to attenuate vibration caused by an earthquake, or a lead damper that deforms a damper member formed of lead to attenuate vibration caused by an earthquake, or friction. It is also possible to use a friction damper or the like that attenuates vibration caused by an earthquake due to frictional resistance of a member.

Next, a modification of the damping mechanism 26 will be described. FIG. 4A is a plan view showing a modification of the damping mechanism 26. FIG. FIG. 4B is a longitudinal sectional view showing a modification of the damping mechanism 26. As shown in FIGS. 4A and 4B, the damping mechanism 36 includes upper and lower surfaces 37a,
37b is sandwiched between the connecting members 38 and 39. That is, the disc-shaped mounting surface 38a of the connecting member 38 is adhered to the upper surface 37a of the damping elastic body 37, and the disc-shaped mounting surface of the connecting member 39 is bonded to the lower surface 37b of the damping elastic body 37. The surface 39a is adhered.

As described above, in the damping mechanism 36, since the upper and lower surfaces 37a and 37b of the damping elastic body 37 are merely attached to the connection members 38 and 39, the damping mechanism 36 can be manufactured relatively easily than the damping mechanism 26. can do. The shaft 38b of the lower connection member 38 is connected to the piston rod 23b of the hydraulic damper 23 via the connection rod 25, and the shaft 39b of the upper connection member 39 is connected to the second brace 27. Have been.

FIG. 5 is a front view showing an example in which the damping mechanism 36 is installed at two places. As shown in FIG. 5, the columns 46 (46 ₁ , 46 ₂ ) of the skeleton 42 are connected to the foundation 47 (47
₁ , 47 ₂ ), and the beam 48 of the frame 42 is
The upper ends of (46 ₁ , 46 ₂ ) are fastened. And
A pair of braces 43 and 44 from the central portion toward the basal 47 _1, 17 ₂ on both sides of the beam 48 is mounted. Each of the intermediate positions of the pair of braces 43 and 44 has a first,
The second damping mechanism 36 _1, 36 ₂ are mounted.

The first damping mechanism 36 ₁ is connected to the column 4 of the frame 42.
6 ₁ and the foundation 47 ₁ and the gusset 50 which is installed in the first corner portion formed by the braces 43 ₁ and brace 44 ₁ between the gusset 49 which is disposed to the intermediate point of the beam 48 of the frame 42 Has been mounted through. Further, braces 43 ₂ and brace 4 between the second damping mechanism 36 ₂ columns 46 ₂ and the base 47 ₂ and gusset 51 and gusset 49 installed in the second corner portion formed by the framework 42
4 ₂ via a mounted.

Here, a case where a minute vibration such as a traffic vibration is propagated to a structure having a brace damper as shown in FIG. 5 will be described. When the structure is shaken by a minute vibration such as a traffic vibration and the frame 42 in the figure is shaken in the direction A, the first brace 43 ₁ and the second brace 44 are used.
Compressive load is transmitted to the first damping mechanism 36 ₁ through _2. Therefore, in the damping elastic body 37, a compression displacement is generated, so that a damping force in the compression direction is generated.

[0034] At the same time, via a first brace 43 ₂ and the second brace 44 _2, a tensile load to the second damping mechanism 36 ₂ is transmitted, pulling for stretching displaced damping elastic member 37 occurs direction of the damping force Occurs. Furthermore, when the framework 42 is swayed in the direction B, the framework 22 in the same manner as when swinging in the direction A damping mechanism 36 ₂ generates the damping force in the compression direction, a second damping mechanism 36 ₂ is pulling direction of the attenuation Generate force.

Next, consider a case where a large shaking such as a large earthquake is applied to the structure and the frame 42 shakes in the direction A. The first through the brace 43 ₁ and the second brace 44 _1, the first damping mechanism 36 _first compression force is transmitted, for exceeding the acceptable range of compressive elastic deformation caused a large compressive displaced damping elastic member 37, the 1 the damping mechanism 36 ₁ is the same rigid member and the usual braces apparent.

Accordingly, the interlayer displacement of the frame 42 can be suppressed, and the damage and collapse of the building can be prevented. Furthermore, when the framework 42 is swayed in the direction B, the framework 42 is a rigid member on the second damping mechanism 36 ₂ is apparently in the same manner as when swinging in the direction A, it is possible to suppress the interlayer displacement of the frame 42. In the above modification has been described the configuration in which the first damping mechanism 36 ₁ and the second damping mechanism 36 ₂ is mounted in a separate brace it is not limited thereto, the first damping mechanism 36 ₁ and the second
And a damping mechanism 36 ₂ between the same brace may be be arranged in series.

[0037]

As described above, according to the first aspect of the present invention, since a damping mechanism having a damping elastic body for generating a damping force by a minute displacement is provided in series with the damper, vibration having a large amplitude such as an earthquake can be generated. A relatively large vibration can be controlled by the damping force of the damper when transmitted to the brace, and a damping elastic body is used when the brace is displaced by relatively small vibration energy such as a small earthquake or traffic vibration. A relatively small vibration can be damped by the damping force, and a minute vibration of the structure can be suppressed.

According to the second aspect of the present invention, since a damping mechanism having a damping elastic body for generating a damping force by a minute displacement is provided for each of the plurality of braces, the amplitude of an earthquake or the like is provided by the plurality of damping elastic bodies. Large vibrations and relatively small vibrations such as small earthquakes and traffic vibrations can be suppressed.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a structure to which an embodiment of a brace damper according to the present invention is attached.

FIG. 2 is an enlarged view showing a damping mechanism 26;

FIG. 3 is a longitudinal sectional view showing an operation state of the damping mechanism 26.

FIG. 4 is a plan view showing a modification of the damping mechanism 26.

FIG. 5 is a front view showing an example in which the damping mechanism 36 is installed at two places.

[Explanation of symbols]

11 structure 12 first floor framework 13 second floor framework 14 (14 _1, 14 _2), 17 (17 _1, 17 _2), 4
6 (46 _1, 46 ₂₎ Column 15 (15 ₁ to 15 _2), 47 (47 _1, 47 ₂₎ Basic 16,18 beam 19 brace damper device 23 hydraulic damper 24 first brace 25 connecting rod 26, 36 damping mechanism 27 Second brace 33, 38, 39 Connecting member 34, 37 Damping elastic body 35 Cover 36 ₁ First damping mechanism 36 ₂ Second damping mechanism 43, 44 Brace

Claims (2)

[Claims] 1. A brace damper having a damper for damping vibration in a brace mounted at a predetermined angle in a space formed by columns and beams, the damper having a damping elastic body for generating a damping force with a minute displacement. A brace damper comprising a damping mechanism provided in series with the damper. 2. A brace damper to which a plurality of braces coupled to a frame formed by pillars and beams are attached at a predetermined angle, and wherein a damping force is generated for each of the plurality of braces by a minute displacement. A brace damper comprising a damping mechanism having a body.