JPH094089A - Viscoelastic damper - Google Patents

Abstract

PURPOSE: To effectively absorb and attenuate stresses in every direction without damage of viscoelastic dampers. CONSTITUTION: A viscoelastic damper is provided with a body made of a viscoelastic member and the upper end 9a and the lower end 9b which can receive external stresses, are formed in the body 90 in the state these upper and lower ends 9a, 9b are mutually arranged back to back. A hole 13 for deformation is formed in the body 90 in the state the body 90 is pierced in the direction crossing at right angles against the arrangement of the upper and lower ends 9a, 9b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a viscoelastic damper suitable for suppressing vibration of a structure or the like.

[0002]

2. Description of the Related Art FIG. 7 is a diagram showing an example of a conventional viscoelastic damper, and FIG. 8 is a diagram showing another example of a conventional viscoelastic damper. Conventionally, structures or 2 due to earthquake or wind
One of the vibration control means to suppress the sway between two structures
One of them is a viscoelastic damper. The viscoelastic damper 63 or the viscoelastic damper 65, which is an example of a conventional viscoelastic damper, includes a first structure 61A and a second structure 61A that can relatively sway, as shown in FIG. 7 or FIG. 6
It is provided in the form of connecting both 61A and 61B between 1B (as a concrete example of the structures 61A and 61B,
For example, there are two buildings, or a substructure and a superstructure such as a building supported on the substructure. ). Further, the structures 61A and 61B are respectively in the directions of arrows A and B in FIG. 7 (this is the Y-axis direction) or in FIG.
Has damper installation parts 62a and 62b facing in the directions of arrows C and D (this is the Z-axis direction), and a plate-like viscoelastic damper 63 is provided between these damper installation parts 62a and 62b.
(As shown in FIG. 7) or these damper installation parts 62
A columnar viscoelastic damper 65 (shown in FIG. 8) extending in the opposing direction of a and 62b (that is, the Z-axis direction) is installed.

Therefore, relative shaking occurs between the structures 61A and 61B, and the damper installation portions 62a and 62b shown in FIG.
Is relatively displaced in the X-axis and / or Z-axis directions, or when the damper installation portions 62a and 62b shown in FIG. 8 are relatively displaced in the X-axis and / or Y-axis directions. ,
Shear stress or bending stress is generated in the viscoelastic damper 63 or the viscoelastic damper 65. The viscoelastic dampers 63 and 65 effectively absorb and attenuate the energy due to such shearing stress and bending stress in a form in which the viscoelastic dampers 63 and 65 elastically deform. As a result, relative shaking between the structures 61A and 61B is suppressed.

[0004]

However, the structure 61
A relative shake occurs between A and 61B, and the damper installation parts 62a and 62b shown in FIG. 7 are relatively displaced in the Y-axis direction, or the damper installation parts 62a and 62b shown in FIG. 8 are relatively moved. It may be displaced in the Z-axis direction. That is, in this case, tensile stress or compressive stress in the Y-axis direction acts on the viscoelastic damper 63 shown in FIG. 7, and tensile stress or compressive stress in the Z-axis direction acts on the viscoelastic damper 65 shown in FIG. Will be done. That is, the viscoelastic damper 6
The material of the viscoelastic member forming 3, 65 is itself pulled or compressed. However, the material of the viscoelastic member has a problem that when it is subjected to a large tensile or compressive deformation, the energy absorption performance is reduced or the maximum deformation amount is decreased. Further, if a large tensile stress or compressive stress is applied to the viscoelastic dampers 63 and 65 carelessly, the viscoelastic dampers 63 and 65 may be damaged.

In view of the above circumstances, the present invention provides a convenient viscoelastic damper capable of effectively absorbing and damping the stress acting on the viscoelastic damper in any direction without damaging the viscoelastic damper. It is provided.

[0006]

That is, the first invention of the present invention has a main body (90) made of a viscoelastic member, and the main body (90) can receive external stress. The stress receiving portion (9a) and the second stress receiving portion (9b) are
The first and second stress receiving portions (9a, 9b) are formed so as to face each other, and the first and second stress receiving portions (9a, 9b) are arranged on the main body (90). The deformation promoting space (13) is formed so as to penetrate the main body (90) in a direction perpendicular to the direction.

The second aspect of the present invention is the viscoelastic damper (9) of the first aspect, which is a plane perpendicular to the arrangement direction of the first and second stress receiving portions (9a, 9b). The cross-sectional area of the body (90) is constant between the first and second stress receiving portions (9a, 9b).

A third aspect of the present invention is the viscoelastic damper (9) according to the first aspect, further including the main body (90).
Is formed by laminating a plate-shaped viscoelastic plate member (20) and a plate-shaped support plate member (21).

The numbers and the like in parentheses indicate the corresponding elements in the drawings for convenience, and therefore, the present description is not limited to the description on the drawings. below

The same applies to the column of [Operation].

[0010]

In the first aspect of the present invention having the above structure, the main body (90) deforms the portion around the deformation promoting space (13) by bending, that is, deforms the deformation promoting space (13). Shape, the first and second stress receiving portions (9a, 9a
Elastically expands and contracts in the same direction as the arrangement direction of b).

According to the second invention of the present invention, the first,
Between the second stress receiving portions (9a, 9b), the main body (9
0) The shear stress acting on the whole is not concentrated on a specific portion of the main body (90).

In the third aspect of the present invention, when a compressive force acts on the main body (90) in the laminating direction of the viscoelastic plate member (20) and the support plate member (21), the main body (9)
0) absorbs and supports this compressive force by the support plate member (21) in a manner avoiding excessive compressive deformation.

[0013]

1 is a perspective view showing an example of a viscoelastic damper according to the present invention, FIG. 2 is a side sectional view showing a structural unit to which the viscoelastic damper shown in FIG. 1 is applied, and FIGS. 6
FIG. 6 is a diagram showing another example of the viscoelastic damper according to the present invention.

The structure unit 1 has a first structure 2 such as a high-rise condominium as shown in FIG.
In the center of the structure 2 is formed a void portion 2a extending in the up and down directions of arrows C and D in FIG.
A second structure 3 such as a three-dimensional parking lot is provided in the void portion 2a, and a clearance space 5 is formed between the structures 2 and 3 so as to surround the periphery of the second structure 3. Are formed. The first structure 2 is provided with a damper installation part 6 that horizontally protrudes toward the second structure 3 on the void part 2a side, and the second structure 3 includes On the void portion 2a side, a damper installation portion 7 having a shape protruding horizontally toward the first structure 3 is provided. It should be noted that a plurality of damper installation parts 6 and 7 are provided in a one-to-one correspondence with each other (only two are shown in FIG. 2). As shown in FIGS. 1 and 2, the damper installation portion 6 side is arranged at a height level slightly higher than the damper installation portion 7 side. Both the damper installation parts 6 and 7 are formed in a horizontal plate shape. Therefore, the lower surface of the damper installation part 6 and the upper surface 7a of the damper installation part 7 which correspond to each other are in the directions of arrows C and D which are vertical directions. Is facing.

As shown in FIGS. 1 and 2, a viscoelastic damper 9 according to the present invention is connected and provided between the damper installation portions 6 and 7 corresponding to each other. Viscoelastic damper 9
Has a main body 90 as shown in FIG.
0 is basically a plurality of horizontal plate-shaped viscoelastic plate members 20.
And a plurality of horizontal plate-shaped support plate members 21 are vertically stacked alternately. For example, the viscoelastic plate member 20 is a viscoelastic member such as viscoelastic resin, and the support plate member 21 is made of steel (the main body 90 may include at least the viscoelastic member, Therefore, the main body 90 may be composed of only the viscoelastic member. Body 90
The upper end side and the lower end side are columnar upper end portions 10 and lower end portions 11 extending in the directions of arrows C and D in the drawing (that is, the Z-axis direction of the viscoelastic damper 9) which are vertical directions. That is, the viscoelastic damper 9 has the upper end 9 of the upper end 10.
a is joined to the lower surface 6a of the damper installation portion 6, and the lower end 9b of the upper end 9a and the lower end portion 11 arranged rearward are joined to the upper surface 7a of the damper installation portion 7, respectively. Are connected. That is, the viscoelastic damper 9
The damper installation portion 6, through the upper end 9a and the lower end 9b,
The stress from 7 can be received by the main body 90. Between the upper end portion 10 and the lower end portion 11, there is a variable portion 12 that connects the upper end portion 10 and the lower end portion 11, and the upper end portion 10 and the lower end portion 1 that constitute the main body 90.
1. The variable part 12 is integrally connected to each other. The variable portion 12 has a shape close to a cylinder extending in the horizontal direction, and therefore, the center of the variable portion 12 is in the horizontal direction, that is, the Y axis perpendicular to the Z axis direction which is the arrangement direction of the upper end 9a and the lower end 9b. A deformation hole 13 extending in the direction is formed so as to penetrate therethrough. In addition, the protruding direction of the above-mentioned damper installation portions 6 and 7 is
The viscoelastic damper 9 coincides with the X-axis direction, that is, the horizontal direction that is perpendicular to the Y-axis direction. Furthermore, Z
The cross-sectional area of the main body 90 along a plane perpendicular to the axial direction (that is, a plane parallel to the X axis and the Y axis, that is, a horizontal plane) is constant between the upper end 9a and the lower end 9b.

Since the structure unit 1, the viscoelastic damper 9 and the like are constructed as described above, a multi-story parking machine (not shown) in the second structure 3 which is a multi-story parking lot or the like is operated. As a result, when the second structure 3 shakes horizontally with respect to the first structure 2, or when these structures 2, 3 shake horizontally due to an earthquake, wind, or the like, these structures 3 A relative displacement occurs in the horizontal direction between 2 and 3. Therefore, since relative displacement occurs in the horizontal direction between the damper installation parts 6 and 7, the viscoelastic damper 9 has an upper end 9a and a lower end 9b.
Through this, the horizontal stress caused by the relative displacement, that is, the stress in the X-axis direction and / or the Y-axis direction is transmitted. Then, shearing stress or bending stress acts on the main body 90. However, since the main body is made of a viscoelastic member, the main body 90 effectively absorbs and attenuates energy due to such shear stress and bending stress by elastic deformation. Therefore, the relative shaking between the two structures 2 and 3 is effectively suppressed.

Since the viscoelastic damper 9 has a constant cross-sectional area of the main body 90 on the horizontal plane between the upper end 9a and the lower end 9b as described above, the shear stress and bending as described above are particularly applied to the main body 90. Upper end 9 when stress is applied
It is convenient because the stress acting on the main body 90 between a and the lower end 9b can be prevented from being concentrated on a specific portion of the main body 90 as much as possible.

Further, when these structures 2 and 3 shake in the vertical direction due to an earthquake or the like, relative displacement occurs in the vertical direction between the structures 2 and 3. Therefore, a relative displacement occurs in the vertical direction between the damper installation parts 6 and 7, so that the viscoelastic damper 9 passes through the upper end 9a and the lower end 9b, and the vertical stress generated by the relative displacement, that is, the Z-axis. Directional stress is transmitted. By the way, since the deformation hole 13 is formed in the main body 90 so as to penetrate the main body 90 in the Y-axis direction, the main body 90 has a portion around the deformation hole 13 (that is, both sides of the variable portion 12). The portion () is bent and deformed, that is, the deformation hole 13 is deformed, so that it is easily elastically expanded and contracted in the Z-axis direction. Therefore, as described above, when the stress in the Z-axis direction is transmitted to the viscoelastic damper 9 and the tensile stress or the compressive stress acts on the main body 90, the main body 90 pulls or compresses the material itself of the viscoelastic member. Can be avoided as much as possible, and therefore the main body 9
0 does not break, and elastically expands and contracts in the Z-axis direction in such a manner that the deformation hole 13 is deformed by the tensile stress or the compressive stress. That is, the main body 90 effectively absorbs and attenuates energy due to such tensile stress or compressive stress by elastic deformation. Therefore, the two structures 2,
Relative sway between 3 is effectively suppressed.

It should be noted that the first structure 2 such as a high-rise condominium and the second structure 3 such as a multi-storey car park differ in the degree of subsidence downward with time, and thus with time. A relative displacement occurs in the vertical direction between the damper installation parts 6 and 7. That is, a tensile stress or a compressive stress acts on the viscoelastic damper 9 in the Z-axis direction over time. However, as described above, the viscoelastic damper 9 causes the deformation hole 13 to deform in the Z direction.
It elastically expands and contracts in the axial direction to effectively absorb the energy due to such tensile stress or compressive stress by elastic deformation. Therefore, the viscoelastic damper 9 is not damaged over time.

Since the main body 90 of the viscoelastic damper 9 is constructed by laminating the viscoelastic plate member 20 and the supporting plate member 21 as described above, the viscoelastic plate member 20 and the supporting plate member 21 are laminated. Body 90 in the Z-axis direction
When a compressive force acts on the main body 90,
This makes it possible to absorb and support this compression force while avoiding excessive compression deformation. Therefore, for example, the first structure 2 and the second structure 3 respectively sink downward with the passage of time, a relative displacement occurs between these two structures 2 and 3, and the viscoelastic damper is generated. When a compressive force in the Z-axis direction acts on the main body 90 of the body 9, the main body 90 can absorb and support the compressive force in a manner avoiding excessive compressive deformation, so that the space between the two structures 2 and 3 is reduced. That is, it is convenient because it becomes easy to keep a predetermined space between the parts that were originally at the corresponding height positions (for example, the first floor entrance and exit of a high-rise apartment and the first floor car entrance and exit of a multi-storey car park) ( For example, the height level of the entrance and exit of a high-rise apartment and
It is convenient because the height level of the floor entrance / exit is kept at the same level as much as possible. ).

In the embodiment described above, the main body 90 is provided in a direction perpendicular to the Z-axis direction, which is the arrangement direction of the upper end 9a and the upper end 9b, that is, in the horizontal direction (for example, the X-axis direction or the Y-axis direction). Although one deformation hole 13 is formed so as to penetrate through 90, the main body 90 is formed in the horizontal direction (for example, the X-axis direction or the Y-axis direction) as shown in FIGS. 3, 5, and 6, for example. Two or more deformation holes 13 may be formed so as to penetrate through the main body 90, and the deformation holes 13 may be horizontally arranged in parallel with each other. The direction of penetration of the deformation hole 13 (that is, the Y-axis direction in the figure)
The cross-sectional shape of the main body 90 in a plane perpendicular to is shown in FIG.
It is not limited to that of the second embodiment. For example, as shown in FIG. 3, the cross-sectional shape is an eyeglass type, as shown in FIG. 4, the cross-sectional shape is a rhomboidal annular shape, as shown in FIG. As shown in, the cross-sectional shape is X
Character type can also be adopted.

[0022]

As described above, the first invention of the present invention has a main body such as a main body 90 made of a viscoelastic member,
A first stress receiving portion such as an upper end 9a and a second stress receiving portion such as a lower end 9b capable of receiving a stress from the outside and a second stress receiving portion such that the first and second stress receiving portions are arranged back to back in the main body. And a deformation promoting space such as a deformation hole 13 is formed in the main body so as to penetrate the main body in a direction perpendicular to the arrangement direction of the first and second stress receiving portions. Therefore, if the viscoelastic damper according to the present invention is installed between two structures or the like via the first and second stress receiving portions, these two
When a relative displacement occurs between two structures or the like, the stress generated by the relative displacement is transmitted to the viscoelastic damper through the first and second stress receiving portions. For example, when the stress in the direction perpendicular to the arrangement direction of the first and second stress receiving portions is transmitted to the viscoelastic damper via the first and second stress receiving portions, Shear or bending stress will act. However, since the main body is made of a viscoelastic member, the main body effectively absorbs and attenuates energy due to such shear stress and bending stress by elastic deformation. Further, since the deformation promoting space is formed in the main body so as to penetrate the main body in a direction perpendicular to the arrangement direction of the first and second stress receiving portions, the main body is surrounded by the deformation promoting space. It is easy to elastically expand / contract in the same direction as the arrangement direction by bending and deforming the portion, that is, by deforming the deformation promoting space. Therefore, the stress in the same direction as the arrangement direction of the first and second stress receiving portions is transmitted to the viscoelastic damper through the first and second stress receiving portions, and the tensile stress or compression is applied to the main body. When stress is applied, the body can avoid pulling or compressing the material itself of the viscoelastic member as much as possible, and therefore, the shape which deforms the deformation promoting space by the tensile stress or the compressive stress without damaging the body. And elastically expands and contracts in the same direction as the arrangement direction. That is, the main body effectively absorbs and attenuates the energy due to such tensile stress or compressive stress by elastic deformation. As described above, when the viscoelastic damper according to the present invention is used, it is possible to effectively absorb and attenuate the stress acting on the viscoelastic damper in any direction without damaging it.

The second invention of the present invention is the viscoelastic damper of the first invention, wherein the cross-sectional area of the main body is a plane perpendicular to the arrangement direction of the first and second stress receiving portions. Since the stress is constant between the first and second stress receiving portions, the stress acting on the main body between the first and second stress receiving portions, especially when shear stress or bending stress acts on the entire main body. It is possible to avoid concentrating on a specific part of the body as much as possible. That is, in addition to the effect of the first invention, local stress concentration on the main body can be avoided, which is convenient.

A third aspect of the present invention is the viscoelastic damper according to the first aspect, wherein the main body includes a viscoelastic plate member such as a plate-shaped viscoelastic plate member 20 and a plate-shaped support plate member. 21
In addition to the effect of the first invention, when the compressive force acts on the main body in the laminating direction of the viscoelastic plate member and the support plate member, the main body is The support plate member can absorb and support this compressive force in a manner avoiding excessive compressive deformation. That is, when the viscoelastic damper is installed between two structures or the like in which relative shaking or the like occurs, the main body absorbs and supports the compressive force due to the relative shaking while avoiding excessive compressive deformation. Therefore, it becomes easy to suppress the relative amount of displacement between the two structures or the like and maintain a predetermined distance or the like between the two structures or the like.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a viscoelastic damper according to the present invention.

FIG. 2 is a side sectional view showing a structure unit to which the viscoelastic damper shown in FIG. 1 is applied.

FIG. 3 is a diagram showing another example of the viscoelastic damper according to the present invention.

FIG. 4 is a diagram showing another example of the viscoelastic damper according to the present invention.

FIG. 5 is a diagram showing another example of the viscoelastic damper according to the present invention.

FIG. 6 is a view showing another example of the viscoelastic damper according to the present invention.

FIG. 7 is a diagram showing an example of a conventional viscoelastic damper.

FIG. 8 is a diagram showing another example of a conventional viscoelastic damper.

[Explanation of symbols]

 9 ... Viscoelastic damper 90 ... Main body 9a ... First stress receiving portion (upper end) 9b ... Second stress receiving portion (lower end) 13 ... Deformation promoting space (deformation hole) 20 ... Viscoelasticity Plate member 21 ... Support plate member

Claims (3)

[Claims] 1. A main body made of a viscoelastic member, wherein the main body is provided with a first stress receiving portion and a second stress receiving portion capable of receiving external stress. And a deformation promoting space is formed in the main body so as to penetrate the main body in a direction perpendicular to the arrangement direction of the first and second stress receiving portions. Viscoelastic damper. 2. The cross-sectional area of the main body along a plane perpendicular to the back direction of the first and second stress receiving portions is the first,
The viscoelastic damper according to claim 1, wherein the viscoelastic damper is constant between the second stress receiving portions. 3. The viscoelastic damper according to claim 1, wherein the main body is formed by laminating a plate-shaped viscoelastic plate member and a plate-shaped support plate member.