JPH03156044A - Vibration controlling beam and controller for beam - Google Patents

Abstract

PURPOSE:To obtain optimum damping by loading a viscoelastic member to the flat surface of a beam member of a steel material. CONSTITUTION:Two metal plates 38 and 39 are stuck on both surfaces of a viscoelastic body 37 to form a viscoelastic member 35. The viscoelastic member 35 is brought in contact with the bottom 36 of a lower flange 34a of a H-shaped steel 34, the end section 38a of the metal plate 38 is fixed to the lower flange 34a with a bolt 40 and nut 41, and one the end section 39a of the metal plate 39 is fixed to the lower flange 34a with a bolt 42 and nut 43 to form a vibration controlling beam G.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a vibration damping beam and a beam damping device that are particularly effective for suppressing vertical vibrations on the floor of a long-span structure. .

[Prior Art] Conventionally, the following types of vibration damping beams have been provided for suppressing vertical vibrations generated on the floor surface of long-span structures due to external forces such as earthquakes and mechanical vibrations. That is, the sixth
As shown in the figure (see Utility Model Application No. 61-181410), the inner surface of the flange 2 of the beam l made of a section steel obtained by bending a steel plate into a substantially Σ shape has a high vibration damping performance. This is a vibration damping beam A to which a vibration damping unit 5 constructed by sandwiching a viscoelastic layer 3 between two steel plates 4.4 is attached.

Further, as shown in FIG. 7 (see Utility Model Application Publication No. 57-84218), the elongated rectangular viscoelastic layer 6 is formed into two grooves @7.
There is also a damping H-shaped steel B that is integrally constructed by sandwiching the two parts at the back surfaces of each of them to form an H-shaped cross section.

These vibration damping beams attempt to suppress vibrations generated in a structure by absorbing vibration energy generated on the floor surface of the structure with a viscoelastic layer having high vibration damping performance.

Next, as a beam damping device (hereinafter simply referred to as a vibration damping device) for suppressing vertical vibration, the following ones have already been provided. That is, as shown in FIG. 8, a concrete slab 9 (here, a coil spring 1
0 is attached vertically downward, and an additional vibrating body 12, which is a large number of disk-shaped iron plates 11 stacked on the same axis, is bolted to the tip 10a of a coil spring 10.

In addition, in an improved version of the vibration damping device C, as shown in FIG.
5,15. ... are attached, and the support members 15, 15 .
A vibration damping device in which a steel plate 16 bent into a substantially U-shape is attached to the lower end, a coil spring 17 is arranged vertically on the steel plate 16, and an additional vibrating body 18 is attached to the coil spring 17. There is a lot. The additional vibrating body 18 is made up of a large number of steel plates 19
19, .

Further, there are the following devices in which the coil spring 10 of the vibration damping device C is replaced with a leaf spring. That is, as shown in FIG.
bolt 25. so that the steel plate 24 protrudes vertically downward.
25, a long plate spring 26 extending horizontally outward is attached to the lower end of the steel plate 24, and additional vibrating bodies 27 and 27 are bolted to the vicinity of both ends of the plate spring 26. It is E. The additional vibrating body 27 includes a large number of steel plates 28, 28 . ... are stacked on the same axis and bolted together.

In addition, in a modified version of the damping device E, a pair of steel rods 30, 30 are attached to the concrete slab 29 with bolts 31, 31 so as to project vertically downward, as shown in FIG. , 30, a leaf spring 32 is attached horizontally to the lower end of the leaf spring 30, and an additional vibrating body 3 is mounted at the center of the upper part of this leaf spring 32.
There is a vibration damping device F to which No. 3 is bolted together.

In these vibration damping devices, when vertical vibrations occur on the floor surface of a structure, similar vertical vibrations occur in concrete slabs and H-shaped steel beams. Due to these vertical vibrations, an additional vibrating body attached to the coil spring or leaf spring starts vibrating.

Since the additional vibrating body has inertia, it starts vibrating half a period after the vibration of the concrete slab or beam, and continues to vibrate at an eight-phase phase. Therefore, since the phases of the floor surface and the additional vibrating body in the vertical movement direction are different, the vibration of the floor surface is canceled out by the vibration of the additional vibrating body, and the vibration of the floor surface is suppressed.

[Problems to be Solved by the Invention] By the way, in the conventional damping rod A, since the damping unit is directly attached to the section steel bent into a substantially Σ shape, Although the deformation is small and it is possible to suppress slight vibrations, it has the disadvantage that the effect becomes smaller when the vibrations become slightly larger. Moreover, since it has to have a special structure, it is difficult to use H-shaped steel or I-shaped steel, which are commonly used, and there is a drawback that it lacks versatility. In addition, there were various problems such as forming and processing being difficult and requiring special techniques, and the cross-sectional shape being different from the conventionally used H-shaped steel and ■-shaped steel A material, making it difficult to design. .

In addition, in the damping H-beam steel B, the viscoelastic layer 6 is vertically sandwiched between two groove shaped steels 7.7, so the viscoelastic layer is very effective in absorbing vibrations in the horizontal direction. However, it is not suitable for absorbing vibrations in the vertical direction. Therefore, although a sufficient vibration damping effect in the horizontal direction can be expected, there is a drawback that a vibration damping effect in the vertical direction cannot be expected very much. In addition, since processing becomes difficult, production efficiency is not improved and the product becomes expensive.

Further, in the conventional vibration damping device C, it is necessary to consider the height for suspending the device in addition to the beam size.

Further, since the coil spring 10 has a structure in which the additional vibrating body 12 is suspended, the additional vibrating body 12 always vibrates in the vertical and horizontal directions. These constant stresses are applied to the coil spring 10, accelerating deterioration and damage due to changes over time, resulting in a risk that the shaft of the coil spring 10 may break and the additional vibrating body 12 may fall.

In addition, with a vibration damping device, it is necessary to consider the height for hanging the device, and if the control plate 16 or coil spring I7 deteriorates over time or is damaged, horizontal vibration may occur. There is a risk that the additional vibrating body 18 may fall.

Furthermore, in the vibration damping device E, the vibration and damping rate of the additional vibrating body 27 depend on the specific natural vibration and damping rate of the leaf spring 26, and cannot be varied.

Therefore, it becomes difficult to adjust the damping capacity to suit the structure, and it becomes difficult to obtain optimal damping. Furthermore, if it is necessary to add further attenuation, there is a drawback that it is difficult to do so. In addition, when the steel plate 24 or the leaf spring 26 deteriorates or breaks due to changes over time, swinging occurs in the vertical or horizontal direction.
These oscillations further promote deterioration and damage, and there is a risk that the additional vibrating body 27 may fall.

Furthermore, since the damping device F is a modified version of the damping device E, it has the same problems and risks as described above.

The purpose of this invention is to solve the various problems mentioned above, and to provide a control system that can save space and reduce costs, and that can effectively suppress vertical vibrations of the floor surface. An object of the present invention is to provide a swing beam and a vibration damping device for a beam.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides the following vibration damping beam and beam damping device. That is, the damping beam according to claim 1 is characterized in that the beam is made of steel and has one or more flat surfaces, and a viscoelastic member is attached to the flat surface of the beam. be.

The vibration damping device for a beam according to claim 2 is a vibration damping device that is installed on a beam of a structure, and includes a support member that projects horizontally outward from the beam, and a support member that extends above and below the support member. weights arranged respectively, a connecting member provided to be movable vertically with respect to the supporting member by connecting these weights, and a connecting member inserted between the supporting member and the upper and lower weights to move vertically. The structure is characterized in that it includes an elastic member that urges the weights in a direction to separate them from each other.

The vibration damping device for a beam according to claim 3 is a vibration damping device installed on a beam of a structure, which includes an elastic support member protruding horizontally outward from the beam, and an upper and lower part of the elastic support member. and a connecting member that connects these weights, and a viscoelastic member is attached to both or one of the upper and lower surfaces of the elastic support member. There are characteristics.

[Function] The vibration damper and vibration damping device for beams according to the present invention have the following effects when vertical vibration occurs on the floor of a long-span structure due to an external force such as an earthquake or mechanical vibration. . That is, in the vibration damping beam according to the first aspect, the viscoelastic member constituting the main part of the vibration damping beam is forcibly subjected to deformation caused by vertical vibration of the floor surface through the steel plate. This deformation of the viscoelastic member absorbs the vibration energy and suppresses vibration.

Further, in the beam damping device according to the second aspect, the vertical vibration generated on the floor surface causes the support member to vibrate vertically. Therefore, the weight and the elastic member that constitute the main parts of the beam damping device vibrate in the vertical direction with the same period and different phase as the support member. Since the phases of the vibrations of the support member and the elastic member are different, the phases of the vibration of the floor surface and the vertical vibration of the weight are different, and the vibration of the floor surface is canceled by the vibration of the weight, suppressing the vibration.

Further, in the beam damping device according to the third aspect, the vertical vibration generated on the floor surface causes the elastic support member to vibrate vertically.

Therefore, the weight that constitutes the main part of the beam damping device vibrates in the vertical direction with a phase that is half a period behind the floor beam. Because the phases of the vibrations of the floor beam and the weight are different, the phases of the floor vibration and the vertical vibration of the weight are different, and the vibration of the floor is canceled by the vibration of the weight.
Suppress vibration. Further, the viscoelastic member attached to the elastic support member is deformed by bending deformation caused by vertical vibration of the elastic support member, and the deformation of the viscoelastic member absorbs the vibration energy and suppresses the vibration.

From the above, the vibration damping beam and beam damping device of the present invention can act to suppress vertical vibrations of the floor surface and exhibit a damping effect.

[Example] Hereinafter, each aspect of the present invention will be described based on an example shown in the drawings.

[First Embodiment] FIG. 1 shows a first embodiment which is an embodiment according to claim 1 of the present invention.
It is a figure showing an example. In the figure, reference numeral G indicates a vibration damping beam according to the present invention. The damping beam G is applied to the floor structure of a structure with a long span, and multiple damping beams G are hung between opposing structures such as columns, and flooring material is placed between the damping beams G. The hangings make up the floor of the structure.

The main parts of the damping beam G consist of an H-shaped steel 34 and a viscoelastic member 35.

H type [34 is a structural member that supports the flooring, and the lower flange 3
A viscoelastic member 35 is attached to the lower surface 36 of 4a.

The viscoelastic member 35 includes two rectangular metal plates 38 and 39 on both sides of a rectangular plate-shaped viscoelastic body 37 with high vibration damping performance.
are attached and integrated.

The metal plates 38, 3.9 are made of, for example, steel plates. The viscoelastic member 35 is attached to the lower surface 36 of the lower flange 34a so that the longitudinal direction of each surface matches, and one end 38a of the metal plate 38 is attached to the bolt 40 and the nut 4.
1, one end 39a of the metal plate 39 is connected to the bolt 42.
and are fixed to the lower flange 34a by nuts 43, respectively.

The viscoelastic body 37 has the property of allowing and suppressing relative movement when the metal plates 38 and 39 are moved relative to each other due to vertical vibrations generated on the floor surface of the structure. For example, a mixture of asphalt and rubber, synthetic rubber, natural rubber, soft resin, silicone-based elastic material, etc. are preferably used. In addition, the metal plate 38
．． Regarding the shape of the viscoelastic body 37 inserted between the parts 39, it is desirable to have a plate shape from the viewpoint of workability.

The effects of the damping beam G configured as described above will be explained.

When vertical vibration occurs on the floor surface of a long-span structure due to an external force such as an earthquake or mechanical vibration, the damping girder G curves and relative movement occurs between the two points to which the viscoelastic member 35 is attached. Metal plate 3 of the viscoelastic member 35 attached to the damping beam G
A similar relative movement occurs between 8.39 and 39. Viscoelastic body 37
repeats periodic expansion and contraction in the vertical direction due to this relative movement.

The periodic deformation of the viscoelastic body 37 absorbs vibration energy applied to the structure and suppresses vibration.

The vibration damping beam G is a lower flange 3 of a beam material made of H-shaped W434.
4a, and metal plates 38 on both sides of the viscoelastic body 37.
39 and an integrated viscoelastic member 35, it is possible to easily add damping to the beam material, and by changing the mounting area of the viscoelastic member 35, the damping capacity can be increased. Adjustment is possible to obtain the optimum attenuation.

Furthermore, it is easy to apply to commonly used steel materials, has excellent versatility, and eliminates design difficulties.

Further, since the lower surface 36 of the lower flange 34a is the part that undergoes the largest deformation, the vibration damping effect of the viscoelastic member 35 in the vertical direction becomes sufficiently large.

Moreover, since the damping beam G has a structure that is installed between the structures of the structure, it can be easily applied to conventional structures.

Furthermore, since this embodiment uses the viscoelastic body 37 in the form of a plate, it is easy to set the shape and handle the viscoelastic body 37, thereby improving workability and increasing the degree of freedom in the construction location.

In the above embodiment, the viscoelastic member 35 was fixed to the lower surface 36 of the lower flange 34a of the H-shaped steel 34 with bolts.
For example, H-shaped steel 3
4, the viscoelastic member 35 may be attached directly or attached via a plate.

Further, in the above embodiment, the viscoelastic member 35 is the viscoelastic body 3
Although the metal plates 38 and 39 were attached to both sides of the viscoelastic body 37 and the metal plates 38 and 39, for example,
Metal plate 38, viscoelastic body 37, metal plate 39, viscoelastic body 37
, metal plates 38, . . . , a plurality of metal plates 38, . . . may be alternately stacked and integrated.

[Second Embodiment] FIGS. 2 and 3 are diagrams showing a second embodiment, which is an embodiment of the second aspect of the present invention. In the figure, the symbol J
is a beam damping device (hereinafter simply referred to as a vibration damping device) according to the present invention. The vibration damping device J is applied to the floor structure of a long-span structure, and is attached to a beam of the structure to suppress vertical vibrations occurring in the beam.

As shown in FIG. 2, the main parts of the vibration damping device J include a support member 44, a plurality of weights 45, 45. ... Shaft (connecting member) 46.46, coiled spring (elastic member) 47.47.・・・
It is composed of.

The support member 44 is made of a long rectangular steel plate, and the lower surface 49 of the lower flange 48a of the H-shaped steel 48 placed horizontally.
are abutted so as to be orthogonal to each other, and both ends 4 in the elongated direction
4a and 44a project outward in the horizontal direction. The center part of this support member 44 has bolts 50.50 and nuts 51.
51 is fixed to the lower flange 48a of the H type 1148. Further, insertion holes 52, 52 are formed near both ends 44a, 44a of the support member 44, respectively, and a shaft 46 is vertically inserted into each insertion hole 52.

The shaft 46 is made of a rod, and one end 46a and the other end 46b are located above and below the support member 44, respectively, and are movable in the vertical direction.

A weight 45 is fitted into and fixed to one end 46a and the other end 46b of the shaft 46, respectively.

The weight 45 is made by stacking a large number of rectangular iron plates 53 on the same axis, and an insertion hole 45a is formed in the center of the weight 45 so as to pass through it in the vertical direction. The weight 45 is a nut 54, 54. ... is fixed to the shaft 46.

The coil spring 47 is inserted between the support member 44 and the weight 45 so that the axes of the weight 45 and the shaft 46 coincide, and biases the upper and lower weights 45 and 45 in a direction to separate them from each other. It is.

FIG. 3 is a diagram showing an example of a part in which a vibration damping device J is installed on an H-beam, which is a beam of an actual structure. In this figure, the reference numeral indicates a vibration damping device that is a modification of the vibration damping device J described above. The vibration damping device has almost the same components as the vibration damping device J already explained, and in FIG. 3, the same components as those shown in FIG. , and the explanation of these same elements will be omitted.

The vibration damping device includes 21 support members 55, 55, and a plurality of weights 56, 56.・・Shaft (connection member) K2S, to 4
6. ..., coiled spring (elastic member) K 47, ni 47,
It is composed of...

The support member 55 is made of a long rectangular steel plate, and one end 55a in the long direction is joined to the center of the web 57a of the horizontally placed H-shaped steel 57, and the other end 55b projects outward in the horizontal direction. ing. A pair of insertion holes 58° 58 are formed near the other end 55b of the support member 55.
8 has a shaft 46 inserted vertically.

46a at one end of 46 and 46b at the other end of the nut
A weight 56 is fitted and fixed in each.

The weight 56 is made by stacking a large number of rectangular iron plates 59 on the same axis, and a pair of through holes 56a are provided in the center of the weight 56.
, 56a are formed to penetrate in the vertical direction.

This weight 56 is 54°K54. ... is fixed to the shaft at 46.

The coiled spring 47 is inserted between the support member 55 and the weight 56 so that its axis is parallel to the axis of the weight 56 and coincides with the axis of the shaft 46.

The operation etc. of the vibration damping device J(K) configured as above will be explained.

When vertical vibration occurs on the floor of a long-span structure due to an external force such as an earthquake or mechanical vibration, the H-type 114B (57) begins to vibrate vertically, and the supporting member 44 (55) also begins to vibrate vertically. start. Support member 44 (55) and weight 4
Wrapped spring 47 (K47) inserted between 5 (56)
Since the weight 45 (56) has inertia, the support member 44
(55) repeats expansion and contraction due to vertical vibration, and the weight 45 (5
6) Generate vertical vibrations with different phases. Therefore, the vertical vibration of the floor surface is canceled by the vibration of the weight 45 (56), and vibration is suppressed.

As explained in detail above, the vibration damping device J (K) is attached to the lower flange 48a (center of the web 57a) of the H-shaped steel 48 (57).
Since the support member 44 (55) is extended horizontally from the top and bottom and is provided with a weight 45 (56) and a coiled spring 47 (K47), the coiled spring 47 (K47) is attached to the weight 45 (55).
6) continue to be biased in the direction of 8 distances from each other. Therefore, the weight 45 (56) is stabilized, the vertical vibration of the weight 45 (56) cancels the vertical vibration of the floor surface, and the vibration can be effectively suppressed. Furthermore, since the vibration damping device J (K) can be housed within the beam structure, no extra height is required and the floor height does not need to be increased. In addition, even if the coiled spring 47 (K47) deteriorates or breaks due to changes over time, the shaft 46 (
K46) holds the weight 45 (56), so there is no danger of it falling.

In addition, the vibration damping device J (K) is designed to be installed on the beam of a structure, so it can be easily applied to conventional structures, improving workability and increasing flexibility in installation location. can be increased.

Furthermore, by arranging a plurality of vibration damping devices J(K) in series along the long direction of the beam, it is possible to further enhance the vibration damping effect.

[Third Embodiment] FIGS. 4 and 5 are diagrams showing a third embodiment, which is an embodiment of the third aspect of the present invention. In the figure, the reference numeral indicates a beam damping device (hereinafter simply referred to as a vibration damping device) according to the present invention. Vibration damping devices are applied to the floor structures of long-span structures, and are installed on the beams of structures to suppress vertical vibrations that occur in the beams.

Vibration damping device! As shown in FIG. 4, the main parts of the IL include an elastic support member 60 and a plurality of weights 61, 61 . ... Consists of shafts (connecting members) 62, 62 and viscoelastic members 63, 63.

The elastic support member 60 is made of a long rectangular steel plate, and is in contact with the lower surface 65 of the lower flange 64a of the horizontally placed H-shaped steel 64 so as to be orthogonal to each other. Both ends 60a, 60a in the longitudinal direction of the elastic support member 60 protrude outward in the horizontal direction, and weights 61, 61 are in contact with both the upper and lower surfaces of the ends 60a, 60a, respectively.

The weight 61 is made by stacking a large number of disc-shaped iron plates 66, 66, . The shaft 62 is inserted through the insertion hole 67 .

The shaft 62 is made of a rod, and is configured to fix the weights 61 and 61 in contact with the elastic support member 60 by fastening one end 62a and the other end 62b with nuts 6B, respectively.

On the other hand, the viscoelastic member 63 has two viscoelastic members 69 and 69, which are rectangular plates with high vibration damping performance, attached to the elastic support member 63.
A rectangular metal plate 70. It is made by pasting TO on each.

The two metal plates 70 and 70 are attached to the lower flange 6 of the H-shaped steel 64.
One end 70a is brought into contact with the upper surface of 4a, and the lower flange 64
One end 70a is connected to the elastic support member 60 and the metal [
64b.

The elastic support member 60, the metal plate 64b1, and the metal plate 70°70 are shaped into an H shape by bolts 71.71 and nuts 72.72.
64 is fixed to the lower flange 64a.

FIG. 5 is a diagram showing an example of a state in which a vibration damping device is installed on an H-beam, which is a beam of an actual structure. In this figure, reference numeral M designates a vibration damping device that is a modification of the vibration damping device described above. The damping device M has almost the same components as the already explained allocation device, and in FIG. 5, the same components as those shown in FIG. The description of the same elements will be omitted.

The main part of the vibration damping device M is composed of two elastic support members 73.7.
3. Multiple weights M61. M61. ... Shaft (connection member) MB2. It is composed of MB2, viscoelastic member M63, and M2S.

The elastic support member 73 is made of a long rectangular steel plate, and one end 73a in the longitudinal direction is an H-shaped steel 7 placed horizontally.
The other end portion 73b protrudes outward in the horizontal direction. Weights M61 and M61 are in contact with both the upper and lower surfaces of the other end portion 73b, respectively, so that their axes coincide with each other.

An insertion hole M is provided in the center of the weight M61 so as to pass through it in the vertical direction.
67 is formed, and a shaft M62 is inserted through the insertion hole M67.

The shaft M62 is connected to the weights M61 and MB2 by fastening both ends M62a and M62b with nuts M68, respectively.
is configured to be fixed by a portion that abuts on the elastic support member 73.

On the other hand, the viscoelastic part uM63 consists of two long rectangular viscoelastic bodies M69. M69 is attached to both the upper and lower surfaces of the elastic support member 73 so that their longitudinal directions coincide, and metal plates M7Q and M70 of the same shape are attached thereon, respectively.

The operation of the vibration damping device L(M) configured as described above will be explained.

When vertical vibration occurs on the floor of a long-span structure due to an external force such as an earthquake or mechanical vibration, the H-type W464 (74) begins to vibrate vertically, and as a result, the elastic support member 60 (73)
) and the weight 61 (MB2) also begin to vibrate vertically. Weight 61 (
MB2) has a floor beam H type 1164 (74
) performs vertical vibration with a phase different from that of vertical vibration. Therefore, the vertical vibration of the weight 61 (MB2) works to suppress the vertical vibration of the floor surface, and vibration suppression is performed.

Further, the viscoelastic member 63 (M2S) is the elastic support member 60
The viscoelastic body 69 (M2S) repeats periodic deformation due to the vertical vibration of (73), and this deformation of the viscoelastic body 69 (M2S) absorbs the vibration energy given to the structure and suppresses the vibration.

As explained in detail above, the vibration damping device L (M) is attached to the lower flange 64a (center of the web 74a) of the H-shaped steel 64 (74).
The elastic support member 60 (73) is extended horizontally from
Since the structure has a weight 61 (MB2) and a viscoelastic member 63 (M2S) on the upper and lower sides, damping can be easily added to the beam material, and the mounting area of the viscoelastic member 63 (M2S) can be changed. This makes it possible to adjust the damping capacity and obtain optimal damping. In addition, the viscoelastic member 63 (M2S
) to the elastic support member 60 (73),
Processing is easy and special techniques are not required.

In addition, the vertical vibration of the weight 61 (MB2) is caused by the H-type floor beam 116.
Since the phase is different from the vertical vibration of 4 (74), it acts to cancel the vertical vibration of the floor surface, and the vibration of the floor surface can be suppressed.

In addition, the damping device L (M) is designed to be installed on the beam of the structure, so it can be easily applied to conventional structures, improving workability and increasing the freedom of construction location. can be increased.

Furthermore, by arranging a plurality of vibration damping devices L(M) in series along the longitudinal direction of the beam, it is possible to further enhance the vibration damping effect.

Note that the shapes, materials, etc. of each component shown in each of the above embodiments are merely examples, and can be variously changed based on design requirements.

[Effect of the invention] Claims of this invention! The described vibration damping beam has a structure in which a viscoelastic member is attached to the flat surface of a beam made of steel material having one or more flat surfaces, so that the following excellent effects can be achieved.

(a) Damping can be easily added to the beam material, and the damping capacity can be adjusted by changing the adhesion area of the viscoelastic member, making it possible to obtain optimal damping.

(b) It is easy to apply to commonly used scrap materials, has excellent versatility, and eliminates design difficulties.

(c) Viscoelastic members are easy to process and do not require special techniques.

(d) Since the damping beam has a structure that can be installed between structures such as columns of conventional structures, it can be easily applied to conventional structures as well.

The vibration damping device for a beam according to a second aspect of the present invention includes a support member that projects horizontally outward from the beam, weights arranged above and below the support member, and a structure in which these weights are connected in the vertical direction. The configuration includes a movable connecting member and an elastic member that is inserted between the support member and the upper and lower weights and biases the upper and lower weights in a direction to separate them from each other, so that the following excellent effects can be achieved. can be played.

(a) Since the elastic member continues to bias the weights in the direction of separating them from each other, the weights are stabilized, and therefore, vertical vibration can be effectively suppressed.

(b) Since the height can be reduced, the damping device can be housed within the beam structure, and no extra height is required, so there is no need to increase the floor height.

(c) Even if the elastic member deteriorates or breaks due to changes over time, the connection member inserted through the support member continues to hold the weight, eliminating the risk of the weight falling alone.

(d) Since the vibration damping device is designed to be installed on the beam of the structure, it can be easily applied to conventional structures, improving workability and increasing the degree of freedom in installation location. can.

(e) By arranging a plurality of vibration damping devices in series along the long direction of the beam, it is possible to further enhance the vibration damping effect.

Further, the vibration damping device for a beam according to claim 3 includes an elastic support member projecting horizontally outward from the beam, weights disposed above and below the elastic support member, and a connecting member connecting these weights. Since the viscoelastic member is attached to either or both the upper surface and the lower surface of the elastic support member, the following excellent effects can be achieved.

(a) Damping can be easily added to the beam material, and the damping capacity can be adjusted by changing the mounting area of the viscoelastic member, making it possible to obtain optimal damping.

(b) Since the viscoelastic member only needs to be attached to the elastic support member, processing is easy and special techniques are not required.

(c) The vibration of the weight cancels out the vibration of the floor surface, making it possible to effectively suppress vertical vibration.

(d) Since the vibration damping device is designed to be installed on the beam of the structure, it can be easily applied to conventional structures, improving workability and increasing the degree of freedom in installation location. can.

(e) By arranging a plurality of damping devices in series along the longitudinal direction of the beam, it is possible to further enhance the damping effect.

[Brief explanation of the drawing]

Figure 1 is the claim of this invention! FIG. 2 is a diagram of a vibration damping beam showing one embodiment of the description, wherein (a) is a side view of the vibration damping beam of the above embodiment, and (b) is a view taken along the line ■-■ in FIG. FIG. 2 and 3 are views showing one embodiment of the second aspect of the present invention, FIG. 2 is a front view of the beam damping device of the above embodiment, and FIG. 3 is a front view of the beam damping device of the above embodiment. It is a schematic diagram showing a state in which a beam damping device is equipped on an H-shaped steel beam of an actual structure. 4 and 5 are views showing an embodiment of the third aspect of the present invention, in which FIG. 4 is a front view of the beam damping device of the embodiment, and FIG. 5 is a front view of the beam damping device of the embodiment. FIG. 2 is a schematic diagram showing a state in which a vibration damping device is installed on an H-shaped steel beam of an actual structure. Figures 6 and 7 are diagrams showing conventional vibration damping beams, and Figure 6 is a vibration damping beam in which a vibration damping unit including a viscoelastic layer is attached to a section steel bent into a substantially Σ shape. FIG. 7 is a perspective view of a vibration-damping H-shaped steel in which a viscoelastic layer is sandwiched between the back surfaces of groove-shaped steel. 8 to 11 are diagrams showing conventional beam damping devices, in which FIG. 8 is a side view of a coil spring type beam damping device, and FIG. 9(a) is an improved coil spring type vibration damping device. A side view of the vibration damping device for type beams. Figure (b) is a front view of the vibration damping device for beams.
Figure O is a side view of a steel plate spring type beam damping device, and Fig. 11 is a side view of a modified steel plate spring type beam damping device. G: Damping beam, 34: H-shaped steel, 35: Viscoelastic member, 37: Viscoelastic body, 38.39
...Metal plate, J, K ...Beam vibration damping device, 44.55 ...Support member, 45.56 ... Weight, 4B, 46・・・・・・ Shaft, 47, to 4
7 ・・・・・・Wound spring, 48.57 ・・・
・H-shaped steel, L, M ..... Vibration damping device for rice cake, 60.73 ... .... Elastic support member, 61, MB
2... Weight, 62, MB2... Shaft, 63, M6
3... Viscoelastic member, 69, MB2...
... Viscoelastic body, 70, M2O ... Metal plate.

Claims (3)

[Claims] (1) A vibration damping beam comprising a beam made of steel having one or more flat surfaces, and a viscoelastic member is attached to the flat surface of the beam. (2) A vibration damping device installed on a beam of a structure, which includes a support member that projects horizontally outward from the beam, weights placed above and below this support member, and these weights are connected. a connecting member provided to be movable in the vertical direction with respect to the support member; and an elastic member inserted between the support member and the upper and lower weights to bias the upper and lower weights in a direction to separate them from each other. A beam damping device characterized by comprising: (3) A vibration damping device installed on a beam of a structure, which includes an elastic support member that projects horizontally outward from the beam, weights placed above and below the elastic support member, and these weights. 1. A vibration damping device for a beam, comprising a connecting member for connecting, and a viscoelastic member is attached to either or both the upper surface and the lower surface of the elastic supporting member.