JPH05231041A - Vibration absorber for building - Google Patents

Abstract

PURPOSE:To provide a vibration absorber for suppressing horizontal vibration of a building, which has a simple structure and which may be conveniently used for an industrially manufactured housing or the like at a low cost. CONSTITUTION:A vibration absorber for mainly damping horizontal vibration of a building 1, comprises a weight 2 which is attached to a lateral surface of a horizontal beam 11. Further, the horizontal beam is fixed at its opposite ends to a ceiling structure member so as to be horizontally laid in order to absorb vibration through its horizontal bending vibration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dynamic vibration absorber for a building for suppressing mainly horizontal vibration (rolling) of a building due to wind, earthquake, or traffic vibration.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 63-76932 discloses a vibration damping device for buildings.
Some of them use a dynamic vibration reducer as described in Japanese Patent Publication No. This dynamic vibration reducer is constructed by installing a combination of weight, spring, and resistance elements in a building.

Further, as a vibration isolation device for a floor structure of a building,
As described in Japanese Patent Laid-Open No. 2-194240, a mass body is directly or on a viscoelastic plate on the side surface of a portion corresponding to the antinode of the vibration of the frequency that is desired to be reduced, of each small beam arrayed and fixed between the girders on the floor. There is something to install via.

[0004]

However, in the prior art, the spring and the resistance constituting the dynamic vibration reducer are different from each other. Therefore, the structure is complicated, and it cannot be easily and inexpensively adopted for industrialized houses.

Further, the conventional vibration isolator for floor structures attenuates vertical vibration (50-60 Hz) generated on the floor due to floor impact force, etc., and must be provided on all floor structures on each floor. In addition, there is no horizontal vibration (3 to 8Hz) due to wind, earthquake, and traffic vibration in the building.

It is an object of the present invention to provide a dynamic vibration absorber which has a simple structure and can be easily and inexpensively adopted in an industrialized house or the like in order to prevent horizontal vibration of a building.

[0007]

According to a first aspect of the present invention, there is provided a dynamic vibration absorber for a building for suppressing mainly horizontal vibration of a building, wherein a weight is attached to a side surface of a horizontal member. Both ends of the horizontal member are fixed to the ceiling structure so that the horizontal member is horizontally arranged, and vibration is absorbed by horizontal bending vibration of the horizontal member.

According to a second aspect of the present invention, in a dynamic vibration absorber for a building for mainly suppressing horizontal vibration of a building, the central portion of two vertical horizontal members is joined by a horizontal horizontal member. Nagi, constructed by attaching a weight to the side surface of the horizontal cross member,
Fix both ends of the two vertical horizontal members to the ceiling structure so that each horizontal member is arranged horizontally.Bending vibration of the vertical horizontal members in one horizontal direction and the horizontal horizontal members The vibration in two directions on the horizontal plane is absorbed by the bending vibration in the other horizontal direction.

According to a third aspect of the present invention, in a dynamic vibration absorber for a building for mainly suppressing horizontal vibration of a building, a horizontal transverse member is joined to a central portion of the vertical horizontal member in a crossing state. Then, a weight is attached to the end of the side surface of the horizontal horizontal member, and both ends of the vertical horizontal member are fixed to the ceiling structure so that each horizontal member is placed horizontally. Vibration is absorbed in two directions on the horizontal plane by the bending vibration of the bridge in one horizontal direction and the bending vibration of the horizontal bridge in the other horizontal direction.

The present invention according to claim 4 provides the invention according to claims 1 to 3.
In any one of the present inventions, the horizontal member is composed of a composite material in which two or more materials are laminated.

[0011]

According to the present invention, there are the following actions. The weight is supported by a horizontal member, the bending rigidity of the horizontal member is used as a spring element, and the internal loss due to bending vibration of the horizontal member is used as a resistance element. That is, the horizontal member substitutes the two elements of the spring and the resistance, so that the dynamic vibration absorber having a simple structure can be provided. Therefore, a weight and a horizontal member are formed so that the natural frequency of the dynamic vibration absorber matches the horizontal primary natural frequency of the building, and the horizontal member is fixed to the ceiling structure, thereby The horizontal vibration (rolling) of can be isolated by the dynamic vibration absorption function.

The weight is supported by a horizontal transverse member, the bending rigidity of the vertical horizontal member and the horizontal transverse member is used as a spring element, and the internal loss due to bending vibration of these horizontal members is used as a resistance element. That is, the horizontal member substitutes the two elements of the spring and the resistance, so that the dynamic vibration absorber having a simple structure can be provided. Therefore, by forming the weight and each horizontal member so that the natural frequency of this dynamic vibration absorber matches the horizontal primary natural frequency of the building, and fixing the vertical horizontal member to the ceiling structure. , Vibration of the building in two horizontal directions (rolling) can be isolated by the dynamic vibration absorption function.

In the above, by further comprising the composite material in which the horizontal members are laminated with two or more materials, the characteristics required for the horizontal members, that is, (a) in the horizontal direction Bending vibration can be easily generated, (b) internal loss due to bending can be increased, and (c) the weight can be safely and reliably supported in the vertical direction, which can be more reliably achieved.

In the present invention, it is indispensable to install the dynamic vibration reducer on the ceiling structure, and it is optimal to install it on the ceiling structure on the top floor. However, it goes without saying that the dynamic vibration absorber may be provided on any or all of the ceiling structures on each floor. In the practice of the invention,
When the dynamic vibration reducer is provided on the floor structure, the effect of suppressing the horizontal vibration of the building is small.

[0015]

1 is a schematic view showing a first embodiment of the present invention, FIG. 2 is a schematic view showing a second embodiment of the present invention, and FIG. 3 is a schematic view showing a third embodiment of the present invention. 4 is a schematic view showing a fourth embodiment of the present invention.

(First Embodiment) (Refer to FIG. 1) The dynamic vibration absorber 10 is installed at the back of the second floor hut of a two-story unit building 1 as shown in FIGS. 1 (A) and (B). 1 mainly suppresses vibration (horizontal vibration) in the horizontal direction. The dynamic vibration reducer 10 is constructed by attaching weights 12 and 12 to both side surfaces of the horizontal member 11, and the both ends of the horizontal member 11 are arranged so that the horizontal member 11 is horizontally arranged. It is fixed to the ceiling beam of the building 1 and is absorbed by the bending vibration of the horizontal member 11 in the horizontal direction.

FIGS. 1C and 1D are specific application examples of the dynamic vibration reducer 10. In this application example, two dynamic vibration absorbers 10 are arranged in parallel because of the need for strength. In each of the dynamic vibration absorbers 10, the horizontal member 11 is made of wood, and the horizontal member 11
The cross-sectional dimensions of the were 100 mm high, 60 mm thick, and 2300 mm long. In addition, the total weight of the two dynamic vibration absorbers 10 is 1% of the total weight of the building (3 tons), and as a result, each dynamic vibration absorber 10
Each of the weights 12 provided on both sides of the horizontal member 11 of
The weight of one piece was set to 7.5 kg. By these, building 1
For the horizontal primary natural frequency of 4.3 Hz, the dynamic vibration absorber 10
The natural frequency of was set to 4.3 Hz.

However, as a result of performing a resonance test by vibrating with a horizontal vibration generator installed on the roof of the building 1 in FIG. 1D, as compared with the case where the dynamic vibration absorber 10 is not provided, Shaking is about
It was reduced to 1 / 2.5.

That is, according to this embodiment, there are the following effects. The weight 12 is supported by the horizontal member 11, the bending rigidity of the horizontal member 11 is used as a spring element, and the internal loss due to bending vibration of the horizontal member 11 is used as a resistance element. That is, the horizontal material 11
Since the two elements of the spring and the resistance are substituted, it is possible to provide the dynamic vibration reducer 10 having a simple structure. Therefore, the weight 12 and the horizontal member 11 are formed such that the natural frequency of the dynamic vibration absorber 10 matches the horizontal primary natural frequency of the building 1.
By fixing the horizontal member 11 to the ceiling structure, horizontal vibration (horizontal vibration) of the building 1 can be isolated by a dynamic vibration absorbing action.

The dynamic vibration reducer 10 includes a horizontal member 11 and a weight 12
Since it is configured compactly only by itself, it can be easily installed in the attic space of the building 1.

(Second Embodiment) (See FIG. 2) The difference between the dynamic vibration reducer 20 and the dynamic vibration reducer 10 is that FIG.
As shown in (A) and (B), the horizontal member 21 is replaced with the core member 21A.
It is only configured by a composite material in which adherends 21A and 21B are adhered and laminated on both sides of the. As the core material 21A,
Wood, damping rubber material, and asphalt damping material can be used. An iron plate can be used as the adherend 21B.

2C and 2D are specific application examples of the dynamic vibration reducer 20. In this application example, because of the need for strength,
Two dynamic vibration absorbers 20 were arranged in parallel and used. In each of the dynamic vibration absorbers 20, the core member 21A of the horizontal member 21 is formed of wood, and the adherend 21B is formed of an iron plate (thickness: 2.3 mm), and the cross-sectional dimension of the horizontal member 21 is 100 mm in height. , Thickness 30 mm, length 2300 mm. In addition, the total weight of the two dynamic vibration absorbers 20 is set to 1% of the total weight of the building (3 tons), and as a result, two weights 22 are provided on each side surface of the horizontal member 21 of each dynamic vibration absorber 20. The weight of each one was set to 7.5 kg. As a result, the natural frequency of the dynamic vibration absorber 20 is 4.3 Hz, while the horizontal primary natural frequency of the building 1 is 4.3 Hz.

However, as a result of performing a resonance test by vibrating with a horizontal vibration generator installed on the roof of the building 1 in FIG. 2D, the horizontal vibration of the building 1 is compared with the case where the dynamic vibration absorber 20 is not provided. Shaking is about
It was reduced to 1 / 2.5.

That is, according to this embodiment, in addition to the operation of the dynamic vibration reducer 10 of the first embodiment, the following operation is provided.

In the above, further, the horizontal member 21 is made of a composite material in which two or more members are laminated, so that the characteristics required for the horizontal member 21, that is, (a) horizontal It is possible to more reliably achieve that (b) the internal loss due to bending is large, and (c) the weight 22 can be supported safely and reliably in the vertical direction.

(Third Embodiment) (Refer to FIG. 3) The dynamic vibration absorber 30 is installed at the back of the second floor hut of the two-story unit building 1 as shown in FIGS. 3 (A) and (B). 1 mainly suppresses vibration (horizontal vibration) in the horizontal direction. Then, in the dynamic vibration absorber 30, the central portions of the two vertical horizontal members 31 and 31 are joined by the horizontal horizontal member 32, and the weights 33 and 33 are attached to both side surfaces of the horizontal horizontal member 32, respectively. The two horizontal members 31 and 32 are fixed horizontally to the ceiling beams of the building 1 so that the horizontal members 31 and 32 are horizontally arranged. The vibration in two directions in the horizontal plane is absorbed by the bending vibration in one direction (x direction) and the bending vibration in the other horizontal direction (y direction) of the lateral cross member 32.

FIG. 3A shows a specific application example of the dynamic vibration reducer 30. In the dynamic vibration absorber 30, the horizontal members 31 and 32 are made of wood. The vertical horizontal member 31 has a cross-sectional size of 100 mm in height, 60 mm in thickness, and 2300 mm in length. Has a height of 100 mm, a thickness of 75 mm, and a length of 2300 mm. In addition, the total weight of the dynamic vibration absorber 30 is 1% of the total building weight (3 tons).
As a result, the weight of each of the two weights 33 provided on each side surface of the laterally-extending horizontal member 32 of the dynamic vibration absorber 30 is set to 15 kg. From these, the first natural frequency of the building 1 in the x direction
4.3Hz, y direction primary natural frequency of 4.5Hz, dynamic vibration absorber 30 x direction natural frequency of 4.3Hz, y direction natural frequency of 4.5H
It became z.

However, as a result of performing a resonance test by vibrating with a small vibration exciter installed on the roof of the building 1 in FIG. 3B, as compared with the case where the dynamic vibration absorber 30 is not provided, Shaking is about
It was reduced to 1 / 2.5.

That is, according to this embodiment, there are the following effects. The weight 33 is supported by the horizontal horizontal member 32, and the vertical horizontal member 31 is supported.
And the bending rigidity of the laterally-oriented horizontal member 32 is used as a spring element, and the internal loss due to bending vibration of the laterally-oriented members 31 and 32 is used as a resistance element. That is, the horizontal members 31 and 32 act as the two elements of the spring and the resistance, and the dynamic vibration absorber 30 having a simple structure can be provided. Therefore, the weight 33 and the horizontal members 31 and 32 are formed so that the natural frequency of the dynamic vibration absorber 30 matches the horizontal primary natural frequency of the building 1, and the vertical horizontal member 31 is attached to the ceiling. By fixing the structure 1 to the structure, vibrations (horizontal vibrations) of the building 1 in two horizontal directions can be isolated by the dynamic vibration absorbing action.

Since the dynamic vibration reducer 30 is constructed compactly only from the horizontal members 31, 32 and the weight 33, it can be easily installed in the attic space or the like of the building 1.

The horizontal members 31, 32 of the dynamic vibration absorber 30
May be made of a composite material in which two or more materials are laminated, as in the horizontal member 21 of the dynamic vibration absorber 20.

(Fourth Embodiment) (See FIG. 4) As shown in FIGS. 4 (A) and 4 (B), the dynamic vibration absorber 40 is installed at the back of the second floor shed of the two-story unit building 1 and 1 mainly suppresses vibration (horizontal vibration) in the horizontal direction. Then, the dynamic vibration absorber 40 is constructed such that one horizontal transverse member 41 is joined to both sides of the central portion of the horizontal transverse member 41 in a crossing state.
Weights 43, 43 are attached to the tip portions on both side surfaces of each of the horizontal transverse members 42, and both ends of the vertical horizontal member 41 are arranged so that the horizontal members 41, 42 are horizontally arranged. Fixing to the ceiling beams of the building 1, bending vibration of the vertical horizontal member 41 in one horizontal direction (x direction) and bending vibration of the horizontal horizontal member 42 in the other horizontal direction (y direction). Absorbs vibrations in two directions in the horizontal plane.

FIG. 4A shows a specific application example of the dynamic vibration reducer 40. In the dynamic vibration absorber 40, the horizontal members 41 and 42 are made of wood, and the cross-sectional dimensions of the vertical horizontal member 41 are 100 mm in height, 60 mm in thickness, and 2300 mm in length. The dimensions were 100 mm high, 60 mm thick, and 600 mm long. In addition, the total weight of the dynamic vibration absorber 40 should be 1
%, And as a result, the weight of each one of the two weights 43 provided on both sides of each lateral horizontal member 42 of the dynamic vibration absorber 40 is 15 kg.
Set to. As a result, the x-direction natural frequency of the building 1 is 4.3 Hz and the y-direction primary natural frequency of 4.5 Hz, whereas the x-direction natural frequency of the dynamic vibration absorber 40 is 4.3 Hz and the y-direction natural frequency is 4.3 Hz.
It was set to 4.5Hz.

However, as a result of performing a resonance test by vibrating with a small vibration exciter installed on the roof of the building 1 of FIG. Shaking is about
It was reduced to 1 / 2.5.

That is, according to this embodiment, there are the following effects. The weight 43 is supported by the horizontal horizontal member 42, and the vertical horizontal member 41 is supported.
The bending rigidity of the laterally-oriented horizontal member 42 is used as a spring element, and the internal loss due to the bending vibration of the laterally-oriented members 41 and 42 is used as a resistance element. That is, the horizontal members 41 and 42 act as the two elements of the spring and the resistance, and the dynamic vibration absorber 40 having a simple structure can be provided. Therefore, the weight 43 and the horizontal members 41, 42 are formed so that the natural frequency of the dynamic vibration absorber 40 matches the horizontal primary natural frequency of the building 1, and the vertical horizontal member 41 is used for the ceiling. By fixing the structure 1 to the structure, vibrations (horizontal vibrations) of the building 1 in two horizontal directions can be damped by the dynamic vibration absorbing action.

Since the dynamic vibration absorber 40 is constructed compactly only from the horizontal members 41, 42 and the weight 43, it can be easily installed in the attic space of the building 1.

The horizontal members 41, 42 of the dynamic vibration absorber 40
May be made of a composite material in which two or more materials are laminated, as in the horizontal member 21 of the dynamic vibration absorber 20.

[0038]

As described above, according to the present invention, since the horizontal vibration of the building is isolated, it is possible to provide a dynamic vibration absorber which has a simple structure and can be easily and inexpensively adopted in industrialized houses and the like.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a second embodiment of the present invention.

FIG. 3 is a schematic diagram showing a third embodiment of the present invention.

FIG. 4 is a schematic view showing a fourth embodiment of the present invention.

[Explanation of symbols]

 1 Building 10, 20, 30, 40 Dynamic vibration absorber 11, 21, 31, 41, 42 Horizontal member 12, 22, 33, 43 Weight

Claims (4)

[Claims] 1. A dynamic vibration absorber for a building mainly for suppressing horizontal vibration of a building, comprising a weight attached to a side surface of a horizontal member, wherein the horizontal member is arranged horizontally. A dynamic vibration absorber for buildings, characterized in that both ends of a horizontal member are fixed to a ceiling structure, and the horizontal member absorbs vibration by horizontal bending vibration. 2. A dynamic vibration absorber for a building mainly for suppressing horizontal vibration of a building, wherein the central portion of two vertical horizontal members is joined by a horizontal horizontal member, and the horizontal horizontal members are connected. It is constructed by attaching a weight to the side surface, and both ends of the two vertical horizontal members are fixed to the ceiling structure so that each horizontal horizontal member is arranged horizontally. In the horizontal plane due to bending vibration in the horizontal direction and bending vibration in the other horizontal direction
A dynamic vibration absorber for buildings, which absorbs vibrations in one direction. 3. A dynamic vibration absorber for a building, which mainly suppresses horizontal vibration of a building, wherein a horizontal cross member is joined to a central portion of the vertical cross member in a crossed state, and a side surface of the horizontal cross member. It is configured by attaching a weight to the tip of each of the horizontal members, and both ends of the horizontal members are fixed to the ceiling structure so that the horizontal members are horizontally arranged. A dynamic vibration absorber for buildings, which absorbs vibration in two directions on a horizontal plane by bending vibration in the horizontal direction and bending vibration in the other horizontal direction of the horizontal cross member. 4. The dynamic vibration absorber for a building according to claim 1, wherein the horizontal member is composed of a composite material in which two or more materials are laminated.