JP2023129931A - damper device - Google Patents

Abstract

To provide a damper device for generating a fixed damping force when a larger horizontal displacement than a design value occurs, while generating damping force in a simple construction when the displacement occurs in a structure without requiring a special construction for an installation object.SOLUTION: The damper device includes one or more friction damper having an inner cylinder which is flexible with fixed axial friction force occurring in an outer cylinder. The friction damper is connected at one axial side to the movement end of the installation object, and connected at the other axial side to the fixed end of the installation object. In arrangement, the axial direction has a predetermined initial angle to the horizontal direction.SELECTED DRAWING: Figure 1

Description

The present invention relates to a damper device.

A seismic isolation device for a structure is provided with a damper that attenuates the shaking of the structure. For example, Patent Document 1 describes a seismic isolation system that includes a seismic isolation layer provided in a building, and the seismic isolation layer includes an inclined sliding bearing and a vertical displacement dependent friction damper. This seismic isolation system is configured as a displacement-dependent damper that increases the restoring force as the displacement increases because the vertical displacement of the inclined sliding bearing increases as the horizontal displacement increases. According to this seismic isolation system, the amount of attenuation can be changed depending on the magnitude of displacement of the seismic isolation layer.

JP 2021-025300 Publication

However, in the system described in Patent Document 1, when the horizontal displacement exceeds the design displacement, the relationship between the horizontal displacement and the load is maintained linearly. Therefore, in the system described in Patent Document 1, the acceleration generated in the structure increases due to the increase in frictional force, and there is a possibility that the effect of the displacement-dependent damper will be lost. Therefore, the system described in Patent Document 1 has a problem in that a fail-safe is required to suppress a friction force greater than that expected in the design when the horizontal displacement of the building exceeds the design displacement.

Further, according to the system described in Patent Document 1, high followability of damping force is required even when a slight vertical displacement (less than 10 mm) occurs, so there is a problem in that high accuracy is required. Further, the system described in Patent Document 1 requires high vertical rigidity at the installation location, so there is a problem that the installation location is limited.

The present invention does not require any special structure for the installation target, and has a simple configuration that generates a damping force when a structure is displaced, and at the same time generates a damping force when a horizontal displacement exceeding a design value occurs. An object of the present invention is to provide a damper device that generates damping force.

In order to achieve the above object, the present invention includes one or more friction dampers having a telescopic inner cylinder that generates a constant frictional force in the axial direction within the outer cylinder, and one or more axially side of the friction damper. is connected to a movable end of the installation target, the other side in the axial direction is connected to a fixed end of the installation target, and the axial direction is arranged so as to have a predetermined initial angle with respect to the horizontal direction. This is a damper device.

According to the present invention, it is possible to configure a displacement-dependent damper whose damping force increases in proportion to an increase in displacement occurring in a building. According to the present invention, it can be configured using a general friction damper, and construction costs can be reduced.

Further, the present invention provides that when an external force that causes the fixed end and the moving end to relatively displace occurs, a design value is set for the moving distance in the horizontal direction between the fixed end and the moving end, The design value is set so that the angle in the axial direction is equal to or less than a predetermined value close to the horizontal direction, and the damping force generated in the horizontal direction between the fixed end and the moving end is set such that the angle in the axial direction is equal to The distance may increase proportionally and remain approximately constant when the moving distance is equal to or greater than the design value.

According to the present invention, it is possible to configure a displacement-dependent damper whose damping force is approximately constant when the displacement of a building exceeds a design value.

The friction damper of the present invention may include a first friction damper whose initial angle is 90 degrees and a second friction damper whose initial angle is 0 degrees.

According to the present invention, the damping force can be increased with a simple configuration including the first friction damper arranged in the vertical direction and the second friction damper arranged in the horizontal direction.

The present invention includes: a damper section including a plurality of friction dampers having an inner cylinder that generates a constant frictional force in the axial direction in the outer cylinder and is expandable and retractable; and an elastic member that is provided in the damper part and is expandable and retractable. The damper section includes a first friction damper, a second friction damper, a third friction damper, and a fourth friction damper connected in a frame shape, and one side in the axial direction of the second friction damper. The other axial side of the first friction damper is rotatably connected at a third connecting part, and the other axial side of the second friction damper and the other axial side of the third friction damper are connected at the first connecting part. one side of the third friction damper in the axial direction and the other side of the fourth friction damper in the axial direction are rotatably connected at a fourth connecting portion, and one side of the fourth friction damper in the axial direction One axial side of the first friction damper is rotatably connected to a second connecting part, the elastic member connects the third connecting part and the fourth connecting part, and the first connecting part is installed. The damper device is connected to a fixed end of the installation target, and the second connecting part is connected to a movable end of the installation target.

According to the present invention, by combining general friction dampers, the damping force increases in proportion to the increase in displacement that occurs in the building, and when the building displacement exceeds the design value, the damping force remains approximately constant. It is possible to construct a displacement-dependent damper as follows.

The damper portion of the present invention may be arranged such that a straight line connecting the first connecting portion and the second connecting portion is parallel to a horizontal direction.

According to the present invention, a displacement-dependent damper can be configured by four friction dampers combined in a frame shape.

The present invention may include two or more of the damper sections arranged in parallel in the vertical direction.

According to the present invention, the damping force can be increased by increasing the damper in parallel to the horizontal direction.

According to the present invention, it is possible to generate a damping force when a structure is displaced, and also to generate a constant damping force when a displacement greater than a design value occurs.

It is a figure showing the composition of a friction damper. FIG. 3 is a diagram showing restoring force characteristics of a friction damper. FIG. 3 is a diagram showing restoring force characteristics of a plurality of friction dampers arranged in parallel. FIG. 3 is a diagram showing restoring force characteristics of a conventional displacement-dependent damper. 1 is a diagram showing the configuration of a structure to which a damper device according to an embodiment of the present invention is applied. It is a figure showing the composition of a damper device. FIG. 3 is a diagram showing the damping force generated in the damper device. FIG. 3 is a diagram showing the relationship between the angle of the damper device and the cos value. FIG. 3 is a diagram showing restoring force characteristics of a damper device. 7 is a diagram showing the configuration of a structure to which a damper device according to modification 1 is applied. FIG. 7 is a plan view showing the configuration of a damper section according to modification example 1. FIG. 7 is a side view showing the configuration of a damper section according to Modification 1. FIG. 7 is a diagram showing restoring force characteristics of a damper device according to modification 1. FIG. FIG. 7 is a diagram showing the operation of the damper section according to Modification 1. FIG. 7 is a diagram showing the configuration of a damper device according to modification example 1 having a plurality of damper sections. FIG. 7 is a diagram showing the configuration of a structure to which a damper device according to modification 2 is applied. 7 is a diagram showing restoring force characteristics of a damper device according to modification example 2. FIG.

Hereinafter, embodiments of a damper device according to the present invention will be described with reference to the drawings.

As shown in FIG. 1, a general friction damper D includes an outer cylinder D1 and an inner cylinder D2 movably provided within the outer cylinder D1. The friction damper D is damped by the frictional force F generated on the contact surface between the inner circumferential surface of the outer tube D1 and the outer circumferential surface of the inner tube D2 when a clamping force T is applied from the outer tube D1 to the inner tube D2. Generates a force Q. The friction damper D absorbs seismic energy based on the thermal energy generated by the frictional force and the hysteresis absorbed energy generated by the plasticization of the material when a relative displacement occurs between the outer cylinder D1 and the inner cylinder D2 along the axial direction. configured to absorb

As shown in FIG. 2, the friction damper D does not depend on increases or decreases in displacement when the clamping force T is constant and the friction coefficient between the inner cylinder D2 and the outer cylinder D1 is also constant. A constant frictional force F is produced. Therefore, the restoring force characteristic of the friction damper D has a rectangular shape in which the friction force with respect to displacement is constant. A damping force Q using the friction damper D is generated in the opposite direction to the friction force F and has the same magnitude. In order to increase the damping force Q, a damper device may be constituted by a plurality of friction dampers D.

As shown in Fig. 3, the damping force Q of the entire damper device including a plurality of friction dampers arranged in parallel is given by Q = n x F (where n is the number of friction dampers) where F is the friction force. be. At this time, the restoring force characteristic of the entire damper device becomes a rectangle in which the damping force with respect to displacement is constant. In addition to this, a displacement-dependent friction damper has been proposed, in which the damping force increases as the stroke of the damper increases.

As shown in FIG. 4, the displacement-dependent friction damper has restoring force characteristics that are different from ordinary friction dampers. As shown in the figure, the restoring force characteristic of the displacement-dependent friction damper is that the friction force F ₀ in the initial state at the zero displacement point is about several tenths of the friction force F of the conventional friction damper D. The restoring force characteristic of a displacement-dependent friction damper is that the friction force increases as the displacement in the axial direction increases, and when the friction force becomes the same as the friction force of the conventional friction damper D, the design maximum friction force F _max is reached. It has been adjusted as follows. As a result, the displacement-dependent friction damper is configured to generate a smaller friction force than the conventional friction damper D during a small to medium-sized earthquake with a small displacement, and to generate a larger friction force as the displacement increases.

Displacement-dependent friction dampers can be applied to seismic isolation layers of buildings. A first structure in which a displacement-dependent friction damper is installed in the seismic isolation layer is compared with a second structure in which a conventional displacement-independent friction damper D with the same maximum frictional force is installed. When a small to medium earthquake occurs, the first response acceleration of the first structure is smaller than the second response acceleration of the second structure because the frictional force F is small. However, if a large earthquake that exceeds the maximum horizontal design displacement δm of the building occurs, the first response acceleration of the first structure will be such that the friction force of the displacement-dependent friction damper increases in proportion to the increase in displacement. Therefore, there is a possibility that the second response acceleration of the second structure increases compared to the second response acceleration of the second structure. Hereinafter, a damper device that generates a damping force when a structure is displaced and also generates a constant damping force when a displacement greater than a design value occurs will be described.

As shown in FIGS. 5 and 6, the damper device 1 is provided in a structure 50 having a seismic isolation layer M. The structure 50 includes, for example, a lower structure 51 provided on the foundation side and an upper structure 52 provided above the lower structure 51. The upper structure 52 is supported by the lower structure 51 via the seismic isolation layer M. The upper structure 52 is, for example, a building. The lower structure 51 is, for example, a foundation structure provided on the ground side. The lower structure 51 may be provided in the middle layer of the building. The seismic isolation layer M is formed by alternately laminating plate-like bodies made of an elastic body such as rubber and iron plates. The damper device 1 connects the upper structure 52 and the upper structure 52 .

When an earthquake occurs, the lower structure 51 and the upper structure 52 are displaced relative to each other. At this time, the seismic isolation layer M supports the upper structure 52 with respect to the lower structure 51 in a freely expandable and contractable manner. By expanding and contracting the seismic isolation layer M, when an earthquake occurs, the shaking generated in the lower structure 51 is directly propagated to the upper structure 52 due to the relative displacement of the upper structure 52 with respect to the lower structure 51. is prevented.

However, when long-period, large-amplitude earthquake motion occurs, there is a risk that the seismic isolation layer M alone will not be able to reduce the shaking of the upper structure 52. A damper device 1 is provided for damping.

The damper device 1 includes, for example, a friction damper 2 that generates a constant frictional force and is extendable and retractable in the direction of the axis L. Hereinafter, one side in the axial direction and the other side in the axial direction will be defined as appropriate in the description of directions, but this is for convenience, and one side and the other side may be read interchangeably. The other axial side of the friction damper 2 is connected to a fixed end 51A of the structure 50 to be installed, and the one axial side is connected to a movable end 52A of the structure 50 to be installed. The fixed end 51A is provided, for example, on the lower structure 51 side. The fixed end 51A is, for example, a fixed pedestal provided integrally with the lower structure 51. The moving end 52A is provided, for example, on the upper structure 52 side. The moving end 52A is a fixed base provided integrally with the upper structure 52.

A connecting member 51B is provided on the upper surface of the fixed end 51A. One axial side of the friction damper 2 is rotatably connected to a connecting member 51B via a shaft pin P1. A connecting member 52B is provided on the lower surface of the moving end 52A. The other axial side of the friction damper 2 is rotatably connected to the connecting member 52B via a shaft pin P2. The friction damper 2 includes, for example, a cylindrical outer cylinder 3 and a cylindrical inner cylinder 4 movably inserted into the inner peripheral surface of the outer cylinder 3. The inner peripheral surface of the outer cylinder 3 and the outer peripheral surface of the inner cylinder 4 are in contact with each other. The outer cylinder 3 tightens the inner cylinder 4 with a predetermined tightening torque to generate friction.

The inner cylinder 4 is movable relative to the outer cylinder 3 along the axial direction, generates a constant frictional force F in a direction opposite to the direction of movement, and generates a constant damping force Q in the direction of movement. let One axial side of the inner cylinder 4 is inserted into the outer cylinder 3. The other axial side of the inner cylinder 4 is exposed from the other axial side of the outer cylinder 3. On the other axial side of the inner cylinder 4, a rod-shaped first connecting rod 5 that connects with the connecting member 52B is provided. One axial side of the first connecting rod 5 is fixed to the inner cylinder 4. The other axial side of the first connecting rod 5 is rotatably connected to the connecting member 52B via a shaft pin P2.

A rod-shaped second connecting rod 6 is provided on one side of the outer cylinder 3 in the axial direction. The other axial side of the second connecting rod 6 is fixed to one axial side of the outer cylinder 3. One axial side of the second connecting rod 6 is rotatably connected to the connecting member 51B via a shaft pin P1. The axial direction of the friction damper 2 is arranged obliquely so as to have a predetermined initial angle θ ₀ with respect to the horizontal direction. The configuration of the friction damper 2 is one example, and it may have other configurations as long as it can generate a constant frictional force along the axial direction during expansion and contraction.

As shown in FIG. 7, when the frictional force in the axial direction of the friction damper is F, the damping force in the horizontal direction Q _0h and the damping force in the vertical direction Q _0v are expressed by the following equation (1).

地震により、下部構造体５１と上部構造体５２との間に相対的に水平変位δが生じる。これに伴い、摩擦ダンパー２は伸長し、伸長の過程において軸方向に沿って一定の摩擦力Ｆを生じる。このとき、摩擦力Ｆと反対方向に減衰力Ｑを生じる。水平変位δが、最大設計変位δｍに到達した場合、この時の水平方向の減衰力Ｑ_ｍｈと鉛直方向の減衰力Ｑ_ｍｖは、以下の式（２）により示される。このとき、水平変位δの値に関係なく摩擦力Ｆは一定である。

Due to the earthquake, a relative horizontal displacement δ occurs between the lower structure 51 and the upper structure 52. Along with this, the friction damper 2 expands and generates a constant frictional force F along the axial direction in the process of expansion. At this time, a damping force Q is generated in the opposite direction to the frictional force F. When the horizontal displacement δ reaches the maximum design displacement δm, the horizontal damping force Q _mh and the vertical damping force Q _mv at this time are expressed by the following equation (2). At this time, the frictional force F is constant regardless of the value of the horizontal displacement δ.

When the relative horizontal displacement between the lower structure 51 and the upper structure 52 is from 0 to the maximum design displacement δm, the damping force Q generated in the horizontal direction each time the angle θ between the friction damper 2 and the horizontal direction becomes smaller. _h increases. After being relatively displaced, the lower structure 51 and the upper structure 52 return to their original positions based on the restoring force of the seismic isolation layer M. At this time, the friction damper 2 moves along the same trajectory as when it is extended and returns to its original position.

As shown in FIG. 8, for example, when it is desired to set the horizontal design initial damping force generated in the damper device 1 to 20% of the frictional force F, the initial angle between the axial direction of the friction damper 2 and the horizontal direction θ ₀ should be set to 78°. Furthermore, when the relative maximum design displacement δm in the horizontal direction between the lower structure 51 and the upper structure 52 is set to 50 cm, the angle between the axial direction of the friction damper 2 and the horizontal direction at the maximum design displacement δm is It is 18°. At this time, since cos18° is 0.95, the damping force Q in the horizontal direction is 95% of the frictional force F.

In the damper device 1, with the above configuration, when the horizontal relative displacement δ between the lower structure 51 and the upper structure 52 exceeds the maximum design displacement δm, the change in the horizontal damping force Q cos θ is as follows. It becomes 95% or more, which is a constant value approximately close to the value of the damping force Q.

As shown in FIG. 9, the restoring force characteristics of the damper device 1 are as follows: Q _0h =Fcosθ at the initial position where the horizontal relative displacement δ between the lower structure 51 and the upper structure 52 is 0. It is ₀ . For example, the relative displacement (movement distance) in the horizontal direction between the fixed end 51A and the moving end 52A is set to the maximum design displacement δm. The angle of the friction damper 2 in the axial direction is set to be equal to or less than a predetermined value close to the horizontal direction at the position of the maximum design displacement δm. In the example of FIG. 9, each setting value is set to initial angle θ ₀ = 78°, initial horizontal damping force Q _0h = 0.2F, design angle θm = 18°, and horizontal damping force Q _mh = 0.95F. has been done.

Under the above conditions, when an external force that causes a relative displacement between the fixed end 51A and the moving end 52A occurs, the damping force Qh generated in the horizontal direction between the fixed end 51A and the moving end 52A is determined by the damping force Q _h when the moving distance is 0. The period from δm to the maximum design displacement δm increases as the moving distance increases. When the moving distance is equal to or greater than the maximum design displacement δm, the damping force Q _h generated in the horizontal direction becomes approximately constant.

As described above, according to the damper device 1, when a structure is displaced, it generates a damping force that increases in conjunction with an increase in relative displacement in the horizontal direction, and It is possible to realize a displacement-dependent friction damper that generates a constant damping force when a displacement greater than or equal to the maximum design displacement δm occurs. According to the damper device 1, since it is configured using the existing friction damper 2, the device configuration can be simplified and the installation cost can be reduced. According to the damper device 1, when a small seismic force occurs in the structure 50 with a short movement distance, a small damping force _Qh is generated, and when the movement distance is greater than or equal to the maximum design displacement δm, the damping force Qh is generated. It is possible to maintain the acceleration constant and reduce the acceleration applied to the structure 50.

Hereinafter, a modification of the damper device that realizes a displacement-dependent friction damper will be described. In the following description, the same names and numerals will be used for the same configurations as in the above embodiment, and overlapping descriptions will be omitted as appropriate.

[Modification 1]
As shown in FIG. 10, the damper device 1A is attached to the structure 50 so as to be expandable and contractible in the horizontal direction.

As shown in FIGS. 11 and 12, the damper device 1A includes a damper section 2S including a plurality of friction dampers 2, and a stretchable elastic member 10 provided in the damper section. The damper section 2S includes, for example, a first friction damper 2A, a second friction damper 2B, a third friction damper 2C, and a fourth friction damper 2D connected in a frame shape. The first friction damper 2A, the second friction damper 2B, the third friction damper 2C, and the fourth friction damper 2D are each constituted by a friction damper 2.

The damper section 2S is arranged, for example, in the order of a first friction damper 2A, a second friction damper 2B, a third friction damper 2C, and a fourth friction damper 2D in the clockwise order when viewed from above. Further, the damper portion 2S is provided with a first connecting portion R1, a second connecting portion R2, a third connecting portion R3, and a fourth connecting portion R4 that connect the dampers when viewed from above. The first connecting portion R1, the second connecting portion R2, the third connecting portion R3, and the fourth connecting portion R4 are, for example, pin connections using shaft pins.

The other axial side of the first friction damper 2A and the one axial side of the second friction damper 2B are rotatably connected at a third connecting portion R3. The other axial side of the second friction damper 2B and the other axial side of the third friction damper 2C are rotatably connected at the first connecting portion R1. One axial side of the third friction damper 2C and the other axial side of the fourth friction damper 2D are rotatably connected at a fourth connecting portion R4. One axial side of the fourth friction damper 2D and one axial side of the first friction damper 2A are rotatably connected at a second connecting portion R2.

The elastic member 10 connects the third connecting portion R3 and the fourth connecting portion R4. The elastic member 10 is, for example, a coil spring. The angle between the straight line connecting the first connecting portion R1 and the second connecting portion R2 and the axis of the second friction damper 2B is θ, and the initial angle is set to θ ₀ . A pretension force Fs is applied between the third connecting portion R3 and the fourth connecting portion R4 by the elastic member 10 in order to ensure the angle θ. Thereby, the damper portion 2S is configured to be expandable and contractible on the axis connecting the first connecting portion R1 and the second connecting portion R2.

The first connecting portion R1 is, for example, connected to a fixed end 51A of the installation target (structure 50). The second connecting portion is connected, for example, to the moving end 52A in the installation target (see FIG. 10). Thereby, the position of the first connecting part R1 is fixed, and the second connecting part R2, the third connecting part R3, and the fourth connecting part R4 are configured to be movable. The damper portion 2S is arranged such that the straight line connecting the first connecting portion R1 and the second connecting portion R2 is parallel to the horizontal direction.

The friction force of the first friction damper 2A is _FA . The friction force of the second friction damper 2B is F _B. The friction force of the third friction damper 2C is _FC . The friction force of the fourth friction damper 2D is _FD . The restoring force characteristics of the first friction damper 2A, the second friction damper 2B, the third friction damper 2C, and the fourth friction damper 2D are similar to the restoring force characteristics of conventional friction dampers (see FIG. 2). The initial angle θ ₀ of the damper portion 2S and the damping force Q at the angle θ are expressed by the following equation (3).

The damper portion 2S is set so that the maximum design displacement δm occurs when θ=0. At this time, since cos0=1, the damping force Q has a maximum value Qmax, which is expressed by the following equation (4).

Even if the displacement of the damper portion 2S exceeds the maximum designed displacement δm, the θ angle remains 0 degrees. Therefore, when the damping force Q of the damper portion 2S exceeds the maximum design displacement δm, the damping force Q remains constant at Q _max .

FIG. 13 shows the restoring force characteristics of the damper section 2S. After being displaced, the damper portion 2S can return along the same route when returning. As for the restoring force characteristic of the damper portion 2S, since the damping force depends on a cosine function (cos) based on equation (3), the force can be transmitted more smoothly than a linear function (FIG. 4). The frictional forces F _A , F _B , F _C , and F _D of each damper constituting the damper portion 2S may be set to be the same, or may be set to F _B =F _{C and} F _A =F _D. It's okay.

As shown in FIG. 14, when an external force that causes a relative displacement between the fixed end 51A and the moving end 52A is generated, the damping force Q generated in the horizontal direction between the fixed end 51A and the moving end 52A is Between 0 and the maximum design displacement δm, the distance increases in conjunction with an increase in the moving distance. When the moving distance is equal to or greater than the maximum design displacement δm, the damping force Q generated in the horizontal direction becomes _Qmax , which is approximately constant.

As shown in FIG. 15, the damper device 1A may include two or more damper portions 2S arranged in parallel in the vertical direction to increase the damping force Q. As described above, according to the damper device 1A, when a structure is displaced, it generates a damping force that increases in conjunction with an increase in relative displacement in the horizontal direction, and It is possible to realize a displacement-dependent friction damper that generates a constant damping force when a displacement exceeding a design value occurs.

According to the damper device 1A, since it is configured using a plurality of existing friction dampers 2, the device configuration can be simplified and the installation cost can be reduced. According to the damper device 1A, a small damping force Q is generated when a small seismic force occurs in the structure 50 with a short movement distance, and when the movement distance is greater than or equal to the maximum design displacement δm, the damping force Q is kept constant. The acceleration applied to the structure 50 can be reduced.

[Modification 2]
As shown in FIG. 16, the damper device 1B includes a horizontally arranged friction damper 2 (first friction damper) and a vertically arranged friction damper 2 (second friction damper). The damper device 1B includes two friction dampers 2, one having an initial angle of 90° and the other having an initial angle of 0°. Assuming that the friction force F of the friction damper 2 in the initial state is F ₀ , the damping force Q _0h in the horizontal direction and the damping force Q _0v in the vertical direction are expressed by the following equation (5).

When the horizontal movement distance exceeds the maximum design displacement δm, the horizontal damping force Q _mh and the vertical damping force Q _mv are equal to the frictional force F regardless of the displacement, as shown in equation (6). becomes constant.

As shown in FIG. 17, the restoring force characteristic of the damper device 1B is a value that is a combination of the restoring force characteristic of the friction damper 2 installed in the vertical direction and the restoring force characteristic of the friction damper 2 installed in the horizontal direction. . When the horizontal movement distance is from 0 to the maximum designed displacement δm, the damping force Q generated in the horizontal direction increases as the angle θ between the axial direction of the vertically arranged friction damper 2 and the horizontal direction becomes smaller. The damper device 1B can return along the same route after moving a distance in the horizontal direction.

As described above, according to the damper device 1B, the damping force Q is increased compared to the damper device 1 based on the friction damper 2 arranged in the horizontal direction in addition to the friction damper 2 arranged in the vertical direction. be able to. According to the damper device 1B, the configuration can be simplified by using the normal friction damper 2.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described one embodiment, and can be modified as appropriate without departing from the spirit thereof. For example, in the damper device 1B according to the second modification, the damper section 2S of the first modification may be arranged instead of the friction damper 2.

1, 1A, 1B Damper device 2 Friction damper 2A First friction damper 2B Second friction damper 2C Third friction damper 2D Fourth friction damper 2S Damper part 3 Outer cylinder 4 Inner cylinder 10 Elastic member 51A Fixed end 52A Moving end D Friction Damper D1 Outer cylinder D2 Inner cylinder R1 First connecting part R2 Second connecting part R3 Third connecting part R4 Fourth connecting part

Claims (6)

one or more friction dampers having a telescopic inner cylinder that generates a constant frictional force in the axial direction within the outer cylinder;
One axial side of the friction damper is connected to a moving end of the installation target, and the other axial side is connected to a fixed end of the installation target,
The axial direction is arranged at a predetermined initial angle with respect to the horizontal direction,
damper device. When an external force that causes a relative displacement between the fixed end and the moving end is generated, a design value is set for a moving distance in the horizontal direction between the fixed end and the moving end,
The design value is set so that the angle in the axial direction is equal to or less than a predetermined value close to the horizontal direction,
The damping force generated in the horizontal direction between the fixed end and the moving end increases in proportion to an increase in the moving distance, and becomes approximately constant when the moving distance is equal to or greater than the design value.
The damper device according to claim 1. The friction damper is
a first friction damper in which the initial angle is 90°;
a second friction damper in which the initial angle is 0°;
The damper device according to claim 1 or 2. a damper section including a plurality of friction dampers having an expandable and retractable inner cylinder that generates a constant frictional force in the axial direction within the outer cylinder;
a stretchable elastic member provided in the damper section;
The damper section includes a first friction damper, a second friction damper, a third friction damper, and a fourth friction damper connected in a frame shape,
One axial side of the second friction damper and the other axial side of the first friction damper are rotatably connected at a third connecting portion,
The other axial side of the second friction damper and the other axial side of the third friction damper are rotatably connected at a first connecting portion,
One axial side of the third friction damper and the other axial side of the fourth friction damper are rotatably connected at a fourth connecting portion,
One axial side of the fourth friction damper and one axial side of the first friction damper are rotatably connected at a second connecting portion,
The elastic member connects the third connecting part and the fourth connecting part,
The first connecting part is connected to a fixed end of the installation target, and the second connecting part is connected to a movable end of the installation target,
damper device. The damper portion is arranged such that a straight line connecting the first connecting portion and the second connecting portion is parallel to a horizontal direction.
The damper device according to claim 4. comprising two or more damper parts arranged in parallel in the vertical direction;
The damper device according to claim 4.

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