JPH11270180A - Brace damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To damp not only great vibration during great earthquake but also relatively small traffic vibration. SOLUTION: A brace damper device 19 includes a hydraulic damper 23 for damping relatively great vibration, and a damping force generating mechanism 25 for damping relatively small vibration. The damping force generating mechanism 25 includes a link 33 connected to the end of a first brace 24, an oscillating plate 35 connected to the end of the link 33, a mounting plate 37 fixed to a foundation 15-1, and a friction plate fixed to the mounting plate 37 so as to hold the oscillating plate 35. The damping force generating mechanism 25 which is formed to grant frictional force to the oscillating plate 35 with the displacement of the first brace 24 to the axial direction generates damping force even when a brace is displaced by the energy of relatively small vibration including small earthquake and traffic vibration.

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 problem.

[0007]

In order to solve the above problems, the present invention has the following features. Claim 1
According to the invention described above, in a brace damper which is attached by inclining a brace connected to a frame at a predetermined angle, a damping force is generated by displacing the brace in an axial direction at a connection portion between the brace and the frame. It is characterized in that a damping element is provided.

Therefore, according to the first aspect of the present invention, a damping element for generating a damping force by displacing the brace is provided at a joint portion between the brace and the frame body, so that a relatively small earthquake, traffic vibration or the like is provided. Even when the brace is displaced by a small vibration energy, a relatively small vibration can be attenuated by the damping force of the damping element, and the minute vibration of the structure can be suppressed.

According to a second aspect of the present invention, there is provided the brace damper according to the first aspect, wherein the damping element is supported by a tip end of a link connected to an end of the brace.
A damping force is generated by swinging the link tip in accordance with the axial displacement of the brace. Therefore, according to the second aspect of the present invention, the damping element is supported by the link tip connected to the end of the brace, and the link tip swings in accordance with the axial displacement of the brace to generate a damping force. Therefore, since the displacement of the brace is expanded by the link and the damping force by the damping element is obtained, even when the brace is displaced by relatively small vibration energy such as a small earthquake or traffic vibration, the structure is also affected by the damping force by the damping element. 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.
A first corner portion 20 formed by _1, is mounted between the second corner 21 formed by the pillars 14 ₂ and beam 16. The brace damper device 19 includes the first-floor frame 12.
Since it is attached in a state diagonally inclined,
For example, when a displacement in the direction A is applied to the first-story frame 12,
A tensile load acts on 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 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 hydraulic damper 23 that generates a damping force when vibrations in the A and B directions are input to the first-order frame 12, and between a cylinder 23 a of the hydraulic damper 23 and the first corner 20. A mounted first brace 24, a damping force generating mechanism 25 provided between the first brace 24 and the first corner 20, and a piston rod 23 of a hydraulic damper 23.
b and the second brace 2 mounted between the second corner 21
6

The damping force generating mechanism 25 is configured to generate a damping force according to the amount of displacement of the first brace 24 in the axial direction, as will be described later. Even when the brace is displaced by the relatively small vibration energy, the damping force can be generated, and the relatively small vibration energy can be effectively absorbed. Here, the configuration of the damping force generating mechanism 25 will be described.

FIG. 2 is an enlarged front view showing the damping force generating mechanism 25. FIG. 3 is a longitudinal sectional view taken along line CC ′ in FIG. Figure 2, as shown in FIG. 3, the damping force generating mechanism 25 is installed in the first corner portion 20 formed by the pillars 14 ₁ and the base 15 _1, generally, the end of the first brace 24 33 connected to the part via a pin 32
When the swing plate, which is connected through pin 34 to the distal end of the link 33 (the damping element) 35, a mounting plate 37 fixed by hexagon socket head bolts 36 to the base 15 _1, so as to sandwich the rocking plate 35 And a friction plate 38 fixed to the mounting plate 37.

The mounting plate 37, the cross-sectional shape when viewed from the side is formed in an L-shape, it has a vertical plate 37a facing the friction plate 38, and a horizontal plate 37b fixed to the base 15 _1. A horizontal plate 37b is provided on the rear side of the vertical plate 37a.
The reinforcing rib 47 rising from the front is connected. A swing plate 35 is swingably inserted into a gap 48 formed between the vertical plate 37a of the mounting plate 37 and the friction plate 38. When the brace damper device 19 is attached,
Since the swinging plate 35 allows the displacement in the in-plane direction due to the swinging, the mounting work can be easily performed.

The link 33 extends in a direction perpendicular to the direction in which the first brace 24 extends. Since the pin 34 is fixed to the mounting plate 37, the link 33 can swing about the pin 34 as an axis. Installed. Therefore, the amount of displacement of the swing plate 35 with respect to the first brace 24 is
Ratio La / L of distance La between pin 32 connected to brace 24 and distance Lb between pin 34 and the end of rocking plate 35.
It depends on b. Therefore, by increasing the distance Lb from the pin 34 to the end of the swing plate 35 so that the ratio of La / Lb becomes an arbitrary value, the displacement amount of the first brace 24 is enlarged, and the swing plate 35 Can be transmitted to

As described above, the link 33 and the swinging plate 35 connected to the first brace 24 move closer to or away from the hydraulic damper 23 with a larger displacement amount as the first brace 24 is displaced in the axial direction. Rocks in the direction you want. For example, when the first brace 24 is displaced in the C direction, the link 33 and the oscillating plate 35 oscillate in the E direction, and when the first brace 24 is displaced in the D direction, the link 33 and the oscillating plate 35 ,
Swings in the F direction.

A swing plate 35 provided on the link 33
Is sandwiched between the mounting plate 37 and the friction plate 38. The mounting plate 37 and the friction plate 38 are connected to the bolts 39 _{1 to} 39.
_4, is held by a nut 46 _{1-26 4} in a state of pressing the both sides of the swing plate 35. Therefore, bolts 39 _{1 to} 3
By adjusting the 9 ₄ and tightening force of the nut 46 _{1-26 4,} it is possible to adjust the frictional force against the swing plate 35. The swing plate 35, the mounting plate 37, and the friction plate 38
The friction coefficient can be set to an arbitrary value by changing the material of.

The first brace 24 extends in the axial direction (C,
D) and the link 33 and the rocking plate 35 are moved to E and F directions.
When swinging in the direction, the swinging plate 35 slides while being in contact with the mounting plate 37 and the friction plate 38, so that a frictional force is applied to the swinging plate 35. In this state, since the displacement amount of the first brace 24 is small, the hydraulic damper 23 is not operating, and the damping force from the hydraulic damper 23 is not obtained.

At this time, the displacement of the rocking plate 35 is
La between the pin and the pin 32 connected to the first brace 24
L between the pin 34 and the distance Lb between the pin 34 and the end of the rocking plate 35
a / Lb. Therefore, even if the displacement amount of the first brace 24 is minute, the swing plate 35 can swing with a displacement amount sufficient to generate a frictional force. The frictional force obtained when the swinging plate 35 swings as described above is arbitrary depending on the clamping force between the mounting plate 37 and the friction plate 38, the sliding area of the swinging plate 35, and the friction coefficient of each member. Is set to the size of

Therefore, when a vibration having a small amplitude such as a traffic vibration propagates to the first frame 12, the first brace 2
4 is displaced in the axial direction, so that the link 33 and the swing plate 35
The above-mentioned frictional force generated by the rocking operation of the above acts as a damping force. Thus, the minute vibration of the first-order frame 12 is
Vibration is controlled by the frictional force between the swing plate 35 and the mounting plate 37 and the friction plate 38.

The mounting plate 37 is provided with _first and second stoppers 40 ₁ and 40 ₂ for restricting the swing plate 35 from exceeding the swing allowable range. First stopper 4
0 ₁ is attached to the regulating position when the swing plate 35 is swung in the direction F, the second stopper 40 ₂ oscillating plate 35
Is attached to the regulating position when the oscillating member swings in the E direction. The first, the second stopper 40 _1, 40 _2, in order to mitigate the impact force when the swing plate 35 is in contact with, for example, the elastic member 41 _1, 41 ₂ such as rubber is fixed. The first, the second stopper 40 _1, 40 ₂ on the opposite side ribs 42 _1, 42 ₂ are provided for reinforcement.

[0023] Then, the link 33 and the swinging plate 35 is the first as described above, to exceed the second stopper 40 _1, 40 ₂ swing allowable range set by the first brace 2
If 4 is largely displaced in the axial direction (C, D direction), the rocking plate 35 is first, second stopper 40 _1, 40 ₂ of the elastic body 4
1 _1, 41 rocking of ₂ to abut the more same direction is restricted. When the first brace 24 is further displaced in the axial direction (C and D directions) in this contact state, the displacement of the first brace 24 is transmitted to the hydraulic damper 23, and the hydraulic damper 23 generates a damping force.

Therefore, when vibration of a stroke exceeding the swing range in which the swing plate 35 abuts on the first and second stoppers 40 ₁ and 40 ₂ is transmitted to the first and second braces 24 and 26, the hydraulic damper The compressive load or the tensile load acts on 23, and the damping force by the hydraulic damper 23 is applied to the first-order frame 12. As a result, vibration having a relatively large amplitude can be suppressed.

Next, a modified example of the present invention will be described.
As shown in FIG. 4, a first modification of the damping force generating mechanism 25
The friction plate 38 as the pressing plate 60 and the spring 6
The friction force between the friction plate 38 and the oscillating plate 35 is pressed by the spring 61 so as to be pressed against the oscillating plate 35 via 11 ₁ and 61 _2.
It can be set by _1, 61 ₂ of the pressing force. In this case, even when the friction plate 38 is worn, the gap 48 does not open, and a damping force due to friction can be obtained.

Further, as shown in FIG. 5, the friction plates 38, 62 of the pressing plate 60 as a second modification of the damping force generating mechanism 25, wobble plate 35 via a spring 61 _{1-61 4}
It is also possible to make it press from both sides. In this case, it is possible to set the frictional force against the swing plate 35 by the pressing force of the spring 61 _{1-61 4,}
Be varied in the thickness direction of the rocking plate 35 is orthogonal to the swinging direction can be absorbed by expansion and contraction of the springs 61 _{1-61 4.}

FIG. 6 is an enlarged front view showing a third modification of the damping force generating mechanism 25. FIG. 7 is DD ′ in FIG.
It is a longitudinal cross-sectional view along a line. In FIGS. 6 and 7, the same parts as those in FIGS. 2 and 3 are denoted by the same reference numerals and the description thereof will be omitted. As shown in FIGS. 6 and 7, the damping force generating mechanism 51 generally includes a link 33 connected to an end of the first brace 24 via a pin 32, and a link 33 connected to a distal end of the link 33 via a pin 34. Swing member 52
When a box-shaped container 53 which is fixed by hexagon socket head bolts 36 to the base 15 _1, and a fixed mounting plate 37. The bolts 36 in the container 53.

A viscous material 54 having an arbitrary viscosity is injected into the box-shaped container 53. The swing member 52
Have rocking plates 52a to 52c having the same area.
The swing plates 52a to 52c are formed in a comb shape when viewed from the side, and are supported in parallel at predetermined intervals by support portions 52d projecting sideways from the swing member 52. Therefore, the swing member 52 is connected to the viscous body 5 in the container 53.
4 is increased. The swing plate 52a
The shearing resistance of the viscous body 54 can be increased by reducing the interval of ~ 52c. Therefore, the swing member 52 is given a damping force by swinging while the swing plates 52 a to 52 c are immersed in the viscous body 23. The shear resistance of the viscous body 54 applied to the rocking plates 52a to 52c can be arbitrarily set according to the viscosity of the viscous body 54 and the interval between the rocking plates 52a to 52c.

Then, the first brace 24 moves in the axial direction (C,
D direction) and the link 33 and the swing member 52 are moved to E,
When the swinging member 52 swings in the F direction, the swinging members 52 become swinging plates 52a to 52a.
Since 2c swings while being immersed in the viscous body 23, the shear resistance of the viscous body 54 is applied as a damping force. At this time, the displacement amount of the swing member 52 is determined by the ratio La of the distance La between the pin 34 and the pin 32 connected to the first brace 24 and the distance Lb between the pin 34 and the ends of the swing plates 52a to 52c. /
Enlarged by Lb. Therefore, the first brace 24
Even if the displacement amount is small, the swing member 52 can swing with a displacement amount sufficient to generate a damping force. In this state, since the displacement amount of the first brace 24 is small, the hydraulic damper 23 is not operating, and the damping force from the hydraulic damper 23 is not obtained.

Therefore, when a vibration having a small amplitude such as a traffic vibration propagates to the first floor frame 12, the first brace 2
The shear resistance generated by the swinging operation of the link 33 and the swinging member 52 accompanying the axial displacement of 4 acts as a damping force. As described above, the minute vibration of the first-order frame 12 is damped by the resistance between the viscous body 54 and the rocking plates 52a to 52c.

The link 33 and the swing member 52
Are the first and second stoppers 40₁, 40_TwoSet by
The first brace 24 is pivoted so that it exceeds the allowable swing range.
When the displacement is large in the directions (C and D directions), the swing member 5
2 is the first and second stoppers 40 ₁, 40_TwoElastic body 4
1₁, 41_TwoAnd further swing in the same direction is restricted.
Is done. In this contact state, the first brace 24 further moves in the axial direction.
When the first brace 24 is displaced in the directions (C and D directions),
Position is transmitted to the hydraulic damper 23 and damped by the hydraulic damper 23
Force is generated.

Therefore, when vibration of a stroke exceeding the swing range in which the swing member 52 abuts on the first and second stoppers 40 ₁ and 40 ₂ is transmitted to the first and second braces 24 and 26, the hydraulic damper 23 is subjected to a compressive load or a tensile load, and the damping force of the hydraulic damper 23 is reduced to the first-order frame 12.
Is given to As a result, vibration having a relatively large amplitude can be suppressed.

In the above description, the brace damper device provided with the hydraulic damper 23 has been described. However, the present invention is not limited to this, and a configuration without the hydraulic damper 23, that is, a combination of only the brace and the damping force generating mechanism 25 or 51 may be used. good. In this case, it is possible to absorb the small vibration and to increase the strength of the structure by the brace for the large vibration.

In the above embodiment, the brace damper configured to attenuate the vibration caused by the earthquake by the hydraulic damper 27 is described as an example. However, the present invention is not limited to this, and the steel material is plastically deformed instead of the hydraulic damper 27. Use a steel rod damper to attenuate vibration caused by an earthquake, a lead damper to attenuate vibration caused by an earthquake by deforming a damper member made of lead, or a friction damper to attenuate vibration due to an earthquake due to frictional resistance of a friction member. Can also.

[0035]

As described above, according to the first aspect of the present invention, since the damping element for generating the damping force by displacing the brace in the axial direction is provided at the joint portion between the brace and the frame, a small earthquake occurs. Even when the brace is displaced by relatively small vibration energy such as traffic vibration and traffic vibration, the relatively small vibration energy is effectively absorbed by the damping force of the damping element,
Micro vibration of the structure can be damped.

According to the second aspect of the present invention, the damping element is supported by the tip of the link connected to the end of the brace, and the link tip swings in accordance with the axial displacement of the brace to attenuate. To generate the force, the displacement of the brace is expanded by the link and the damping force by the damping element is obtained, so even when the brace is displaced by relatively small vibration energy such as a small earthquake or traffic vibration, the damping force by the damping element is used. It is possible to effectively absorb relatively small vibration energy and to dampen the minute vibration of the structure.

[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 front view showing a damping force generating mechanism 25;

FIG. 3 is a longitudinal sectional view taken along line C-C 'in FIG.

FIG. 4 is a longitudinal sectional view of Modification Example 1 of the damping force generation mechanism 25.

FIG. 5 is a longitudinal sectional view of Modification Example 2 of the damping force generation mechanism 25.

FIG. 6 is an enlarged front view showing a third modification of the damping force generating mechanism 25.

FIG. 7 is a longitudinal sectional view taken along line D-D 'in FIG.

[Explanation of symbols]

11 structure 12 first floor framework 13 second floor framework 14 (14 _1, 14 _2), 17 (17 _1, 17 ₂₎ Column 15 (15 ₁ to 15 ₂₎ Basic 16,18 beam 19 brace damper device 23 hydraulic damper 24 First brace 25 Damping force generating mechanism 26 Second brace 33 Link 35 Swing plate 37 Mounting plate 38 Friction plate 51 Damping force generating mechanism 52 Swing member 53 Container 54 Viscous body 60 Pressing plate 61 _{1 to} 61 ₄ Spring

Claims (2)

[Claims] 1. A brace damper to which a brace coupled to a frame is attached at an angle of a predetermined angle, wherein a damping force is generated when the brace is displaced in an axial direction at a coupling portion between the brace and the frame. A brace damper having a damping element. 2. The brace damper according to claim 1, wherein the damping element is supported by a link tip connected to an end of the brace, and the link tip is responsive to an axial displacement of the brace. A brace damper characterized by generating damping force by swinging.