JPH05248116A - Damping mechanism - Google Patents

Abstract

PURPOSE:To obtain a damping mechanism that has an extended degree of freedom in selection of installation location without disturbing effective use of space in a structure, and is flexible in adjustability while requiring no difficulty in tuning and maintenance and can be produced at low cost. CONSTITUTION:A long rigid material 21 is fixed at its center to a flange 30a of a steel girder 30 of a structure through distancekeeping members 22A. Parts other than the fixed part of the rigid material are made free, and viscous bodies 23 are interposed between the free parts and parts of the flange 30a corresponding to such free parts. Tuning of a damping mechanism 20 is made by adjusting the viscosity and contact area of the viscous bodies 23. Therefore, the optimum amount of damping can be obtained easily for the damping mechanism. In a stage where natural frequency of a structure to which the damping mechanism is installed is almost determined, adjustment to the natural frequency or the like of the damping mechanism can be easily executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping mechanism for damping the vibration of a structure by utilizing the resonance phenomenon of a long rigid member fixed to the structure.

[0002]

2. Description of the Related Art As a vibration damping mechanism, there is a mechanism composed of an additional weight, a spring, a damper, etc., which is attached to a structure and has a function of suppressing a resonance phenomenon at a low natural frequency. As this type of vibration damping mechanism, for example, the following (1)
Items (3) to (3) have been proposed. (1) A tuned mass damper (hereinafter referred to as TMD) in which an additional weight is movably installed on a structure and a support body integrated with the structure and the additional weight are connected via a spring and a damper. (2) A viscoelastic body having a high vibration damping ability is directly attached to a structure portion, for example, a flange of a beam material such as H-section steel or the surface of a web to form a viscoelastic body layer, and if necessary. ,
The viscoelastic layer is constrained by attaching a constraining plate to the surface. (3) A long rigid vibration damping member is manufactured by sticking a viscoelastic body having a high vibration damping ability on the surface of the long rigid vibration damping member, and the central portion of the long rigid vibration damping member is fixed to a portion of the structure where vibration is likely to occur. However, the part other than the fixed part is free (see Japanese Patent Application No. 3-302723).

[0003]

[Problems to be Solved by the Invention]

Since the TMD of (1) is manufactured by precision processing of parts such as an additional mass, a spring, and a damper, it is troublesome and expensive to manufacture. Also, the natural frequency determined from the relationship between the spring and the additional weight needs to match the natural frequency of the structure, but it is not possible to accurately predict the natural frequency of the structure at the time of designing the damping mechanism. Since it is very difficult, it leaves a problem in setting the adjustment range. (2) The vibration damping mechanism in which a viscoelastic material layer is provided on the structure part such as a beam material is a viscoelastic material attached to them when the flange material and the web repeatedly expand and contract due to vibration of the beam material and the like. The viscoelastic body layer is repeatedly deformed by being transmitted to the body layer, and the deformation of the viscoelastic body layer converts the kinetic energy due to the vibration of the beam, etc., into heat energy, and damps the vibration of the beam, etc. to control it. Shake. However, the amplitude of the beams of the structure itself,
Since the frequency etc. is relatively small, the deformation of the viscoelastic body layer itself is also small. Therefore, even if the area of the portion forming the viscoelastic body layer is increased, the damping force is limited, and it is structurally impossible to cover the wide surface of the structure with the viscoelastic body layer. In the vibration damping mechanism (3) proposed by the inventors of the present application, the long rigid vibration damping member is composed of a composite of a long rigid member and a viscoelastic body, and the viscoelastic body bonded to the rigid member is It plays the role of a vibration damping mechanism, and in order to adjust the performance of this vibration damping mechanism to an optimum value, a viscoelastic body is often used, which leaves a problem in cost effectiveness. The problem to be solved by the present invention is to provide a vibration damping mechanism that does not have the drawbacks of the vibration damping mechanisms of (1) to (3), in other words, to freely install the vibration damping mechanism. The purpose of the present invention is to provide a vibration damping mechanism which has a high degree of freedom, does not prevent the effective use of the building space from being hindered by installation of the vibration damping mechanism, has a wide adjustment range, is easy to tune and maintain, and can be manufactured at low cost.

[0004]

The present invention adopts the following construction in order to solve the above-mentioned problems. The structure of the present invention is such that the long rigid member is fixed to the structure at the central portion thereof, and the portions other than the fixed portion are made free,
A vibration damping mechanism is characterized in that a viscous body is interposed between a free portion of a long rigid member and a portion of a structure opposed to this portion. That is, the central part of the long rigid member is fixed to the part of the structure where vibration is likely to occur, the parts other than the fixed part are freed, and the parts on both sides are point-symmetrical about the center of the fixed part. The viscous body is placed between the free part of the long rigid member and the part of the structure facing this part, and when the structure vibrates, the free parts other than the fixed part of the long rigid member are free. By vibrating the parts on both sides, the viscous body interposed between the rigid member and the structure converts the kinetic energy due to the vibration into heat energy to damp the vibration and suppress the vibration to the structure. Is to act. The outline of the principle of the present invention is shown in FIG. 1, in which the central portion of the long rigid member 11 is fixed to a structure 13 via a rigid fixing portion 12, and the other portion than the fixing portion is free. 11a and the other portion 11b are arranged so as to be point-symmetric with respect to the center of the fixed portion 12, and the free portion of the long rigid member and the portion of the structure facing this portion. The vibration damping mechanism 10 is configured with the viscous body 14 interposed therebetween.

The structure 13 has its own natural frequency f ₀ , and the free portion of the long rigid member 11 also has its own natural frequency f. The natural frequency f of the rigid member 11 is mainly the bending stiffness of the rigid member 11, the mass per unit length, the length L of the free portions 11a and 11b, the rigid member 11 and the structure. It is determined by the viscosity of the viscous body 14 interposed between the viscous body 13, and the position (position) of the viscous body, the bonding area, and the like. By adjusting any one of the length L of the rigid member 11, the viscosity of the viscous body 14, the disposition position of the viscous body with respect to the long rigid member 11 and the contact area between the viscous body and the rigid member, f≈f ₀ . To tune When the vibration force is applied to the structure 13, the free portions 11a and 11b other than the fixed portion 12 of the long rigid member 11 that constitutes the vibration damping mechanism 10 resonate and vibrate with a large amplitude. Since the viscous body 14 is interposed between the rigid member 11 and the structure 13, the kinetic energy due to the vibration of the rigid member 11 is converted into heat energy by the viscous body 14 to generate heat. By converting this kinetic energy into heat energy, the energy of vibration is absorbed,
Damping force is generated. This damping force acts on the structure 13 to reduce the vibration of the structure. Since the structure body 13 continues to vibrate while being dampened by the vibration damping force, a vibration damping loop of structure-damping mechanism-damping force generation-damping-structure is repeated. Therefore, vibration energy is absorbed by the rigid member 11 and the viscous body 14 that form the vibration damping mechanism, and the vibration of the structure 13 is suppressed. By providing the vibration damping mechanism 10 of the present invention on the structure, the vibration force applied to the structure can be efficiently converted into thermal energy, and the vibration of the structure can be suppressed.

The long rigid member used in the present invention is usually made of steel material, and in the preferred embodiment, as the steel material, lightweight groove steel, chevron steel, H-shape steel and the like are used. Further, as the long rigid member, it is possible to use a viscoelastic body having a high vibration damping ability attached to the surface of the long rigid member to form a rigid vibration damping member. Further, the long rigid member can be made of an alloy having a high vibration damping ability (member damping). When the alloy is made of the above alloy, the alloy is processed into a cross-sectional shape capable of obtaining a desired rigidity, and the alloy is cut into a predetermined length to form a long rigid vibration damping member. As the alloy, for example, a 3.5% Al-0.5% Si-Fe alloy or the like can be used. The long rigid member is usually composed of a member that is continuous over the entire length, and its central portion is fixed to the structure. However, in some cases it may be more convenient to construct the long rigid member with a pair of members. In this case, a pair of rigid members whose length is longer than the length L of the free portion other than the fixing portion by the length of the fixing portion are arranged on the same central axis line with the fixing portions facing each other. In addition, it is fixed to the structure such that the free portion other than the fixed portion is located in point symmetry.

In the vibration damping mechanism of the present invention, the long rigid member is attached to the portion of the structure which is prone to shake. In a preferred embodiment, a long rigid member is provided at the symmetrical position on both sides of the lower web of the upper flange of the H-section steel beam of the structure or at both symmetrical positions of the upper web of the lower flange. The long rigid member is arranged in parallel with the surface and the flange surface, the central portion of the long rigid member is fixed to the flange via the spacing member, and the portions other than those fixed portions are made free, and the long rigid member is made free. A viscous body is interposed between this and the flange portion of the steel beam facing this portion. In the vibration damping mechanism of the present invention, when the gap between the free portion of the long rigid member and the portion of the structure facing it is large, a viscous body and a resistor are arranged in the gap. The resistor is attached to the long rigid member or the structure, and the viscous body is interposed between the surface of the resistor and the surface of the long rigid member or the structure. In the vibration damping mechanism of the present invention, the viscous body may be present between the long rigid member, the structure, and the resistor, but in a preferred embodiment, the viscous body is enclosed in a bag body to contain the viscous body bag. A body is manufactured, and the viscous body bag body is interposed between the rigid member and the structure.
Alternatively, a container containing a viscous material and a resistor are placed in the gap between the rigid member and the structure, and the container is attached to the upper side of the long rigid member or structure, and the resistor is placed under the long rigid member or structure. Mounted on the side so that a viscous body exists between the lower surface of the resistor and the bottom surface of the container.

[0008]

EXAMPLE 1 The first example is shown in FIGS. 2 to 7 and is an example in which the vibration damping mechanism 20 is attached to a steel frame beam 30 made of H-shaped steel which constitutes a part of the structure. The long rigid member 21
The light groove section steel is cut into a predetermined length, and one bolt through hole 21c is formed on the central axis line in the longitudinal direction of the upper and lower flanges 21a in the central portion or on a line parallel to the central axis line.
Bolt through holes 21c are formed on the above-mentioned lines of the upper and lower flanges 21a which are separated by the same distance from the bolt through holes 21c. Bolt through holes 30c are drilled at symmetrical positions on both sides of the web 30b of the upper flange 30a of the swingable central portion of the steel beam 30 of the structure so as to correspond to the bolt through holes 21c of the flange 21a of the rigid member 21. To do. In addition, the spacing member 22A is formed to have a size that is a fraction of the size of the web 21b of the rigid member 21 in the height direction, and the spacing member 22B is formed to form the space between the flanges 2 of the rigid member 21.
Approximately match the dimensions of 1a and 21a, and their 22A, 2
Form a bolt through hole at the center of 2B. The trunk portion of the bolt b is connected to the bolt through hole 21c of the lower flange 21a of the rigid member 21, the bolt through hole of the spacing member 22B, and the bolt through hole 21 of the upper flange 21a of the rigid member 21.
22A of the space holding member is fitted to the trunk portion of the bolt b, and the tip portion of the bolt b is passed through each of the bolt through holes 3 of the steel beam 30.
Pass through 0c and screw in nut n to tighten. Then, the pair of rigid members 21 are located at symmetrical positions on both sides of the lower web 30b of the upper flange 30a of the steel beam 30, and fixed to the flange 30a of the steel beam 30, and the portions other than the fixed portions are free. To Then, each rigid member 2
The viscous body 23 is packed in the gap between the upper surface of the upper flange of the portion from the tip of 1 and the lower surface of the upper flange 30a of the steel beam 30 facing this portion using a whirlpool to suppress vibration. The mechanism 20 is completed.

When installing the vibration damping mechanism 20, the natural frequency f ₀ of the portion of the steel beam 30 of the structure is measured, and the natural frequency f ₀ and the natural frequency f of the vibration damping mechanism are substantially the same. The length L of the rigid member 21, the adhesion area of the viscous body, the viscosity of the viscous body, etc. are determined as (f≈f ₀ ). When the vibration force acts on the structure and the steel beam 30 vibrates, the free portion of the long rigid member 21 resonates and vibrates with a large amplitude. Then, the vibration is transmitted to the viscous body 23 interposed between the rigid member and the steel beam via the rigid member 21, and the viscous body 23 is deformed. Due to the deformation of the viscous body, the viscous body 23 of the steel frame beam 30 or the like is deformed. The kinetic energy due to the vibration is converted into heat energy, the energy of the vibration is absorbed, and the steel beam 30 constituting the structure is efficiently damped. The vibration damping device 20 of the first embodiment can damp the vibration of the steel beam in the web width direction and the vibration of the steel beam in the flange width direction. The vibration damping device 20 shown in FIGS. 2 to 5 is an example in which the long rigid member 21 is made of only light groove section steel.
As shown in FIGS. 6 and 7, a long rigid member 21 made of light grooved steel has a viscous material having a high vibration damping ability on the longitudinally extending surface 21b ₁ of the web 21b on the side where the flange 21a projects. Apply the elastic layer 28 thinly,
A constraining plate 29 may be attached to the outer surface of the viscoelastic body layer 28 to form a rigid vibration damping member. When the long rigid member 21 is formed of a rigid vibration damping member, the damping force of the rigid vibration damping member itself is added, so that the damping force of the vibration damping device 20 is doubled. As shown in FIG. 4, the upper and lower flanges 30a of the steel beam 30 are arranged so that the vibration damping mechanism 20 does not fall accidentally.
The cover 32 is attached between the edges.

A second embodiment is shown in FIGS. 8 and 9, and the long rigid member 21 is formed by cutting a light groove section steel to a predetermined length as in the case of the first embodiment, and the long rigid member 21 has a web at the center thereof. 21
Bolt through holes 21c are formed at the center of b and the center of two webs 21b at the same distance in the longitudinal direction from the central portion. Bolt through holes 21c corresponding to the bolt through holes 21c of the web 21b of the long rigid member 21 are provided at symmetrical positions on both sides of the web 30b of the upper flange 30a of the swingable central portion of the H-shaped steel beam 30 of the structure. 30c are drilled respectively. Further, the spacing member 22C is formed slightly smaller than the dimension of the flange 21a of the rigid member 21 in the width direction, and a bolt through hole is formed at the center thereof. With the side of the long rigid member 21 having the flange 21a facing downward, the trunk portion of the bolt b is passed through the bolt through hole 21c of the rigid member 21, and the spacing member 2 is attached to the bolt b.
After fitting 2C, the tip portion of the bolt b is passed through the bolt through hole 30c of the steel beam 30, the nut n is screwed and tightened, and the pair of rigid members 21 is attached to the upper web 30b of the steel beam 30 and the lower web 30b of the flange 30a. Fix them in symmetrical positions on both sides of and secure the long parts on both sides of the fixed part. Then, the upper side of the flange of each rigid member 21 and the upper side flange 30a of the steel beam 30 facing the upper side of the flange.
The viscous body bag body 24 is interposed between the viscous body bag body 24 and the lower side of the viscous body bag body 24.
Upper surface of flange of steel and flange 30 of steel beam 30
The vibration damping mechanism 20 is completed by attaching it to the lower surface of a. The viscous body bag body 24 is a bag body 24 made of a film-like film body.
It is formed by enclosing the viscous body 23 in a. If necessary, thin plates 24b are attached to the upper and lower sides of the bag body 24a to facilitate attachment to long rigid members and structures.
Instead of the viscous body bag body 24, as shown in FIG. 10, the viscous body 2 is provided between the upper thin plate 24b and the lower thin plate 24b.
It is also possible to use those in which 3 is arranged as a plurality of thick film-shaped members with a space therebetween, and the upper and lower portions of each film-shaped member are adhered to the thin plate 24b. In this case, a viscous body with high viscosity is required.

The vibration damping mechanism 20 of the second embodiment is similar to the first embodiment in that the natural frequency f of the vibration damping mechanism and the natural frequency f of the structure are f.
₀ and the substantially identical (f ≒ f ₀₎ as the length of the rigid members 21 L, the viscosity of the viscous material, interposed position of the viscous body, determines the contact area of the viscous body or the like, the excitation force structure When it works, the steel beam 3
0 vibrates, the free portion of the long rigid member 21 resonates, and vibrates with a large amplitude. And
This large vibration is transmitted to the viscous body 23 in the viscous body bag body 24, and the viscous body flows according to the vibration, and the flow of this viscous body causes the kinetic energy due to the vibration of the steel beam 30 or the like to become thermal energy. The energy of the vibration is converted to absorb the vibration energy, and the steel beam 30 and the like are efficiently damped. In the second embodiment, since the viscous body 23 is enclosed in the bag body 24a,
Even if the gap between the rigid member 21 and the flange 30a is large, the viscous body 23 can be easily interposed in the gap, the viscous body 23 does not flow out, and handling is very simple.

A third embodiment is shown in FIGS. 11 and 12, wherein the long rigid member 21 is made by cutting light angle steel into a predetermined length,
In the same manner as in Example 1, the corner portion of the central portion of the long angle steel rigid member 21 and the two corner portions that are the same distance in the longitudinal direction from the center portion are arranged in the direction of the center line that symmetrically divides the angle steel. Each of the bolt through holes 21c is formed by drilling. Corresponding to the bolt through holes 21c of the long rigid member 21 at symmetrical positions on both sides of the web 30b of the upper flange 30a of the swingable central portion of the H-shaped steel beam 30 of the structure,
A bolt through hole 30c is formed. Further, the long spacing member 22D is provided with a V-shaped groove in its lower portion that conforms to the outer shape of the angle portion of the angle steel, and the spacing member 22E has its upper portion matched with the shape of the inner angle portion of the angle steel. Each of the holding members 22D and 22E has a V-shaped protrusion, and a bolt through hole is provided at the center thereof. After fitting the interval holding member 22E to the trunk portion of the bolt b, the bolt through hole 2 of the rigid member 21
1c, the V-shaped ridges of the spacing member 22E are fitted inside the chevron corners of the rigid member 21, and the spacing member 22D is fitted to the tip side portion of the bolt b, and the long rigid member 21 The upper corner portion is fitted into the V-shaped groove of the spacing member 22D, the tip portion of the bolt b is passed through each bolt through hole 30c of the steel beam 30, the nut n is screwed and tightened, and the pair of rigid members 21 is connected to the steel beam. The upper flange 30a of 30 is fixed to both sides of the lower web 30b at symmetrical positions, and the portions on both sides of the fixed portion are freed. Then, the viscous body sealing body 24 is interposed between the upper side of the flange of the portion from the tip of each rigid member 21 and the lower side of the flange 30a of the steel beam 30 facing the rigid body 21, and The thin plate 24b is attached to the lower side of the flange 30a of the steel beam 30, and the lower portion of the bag body 24a is placed on the upper corner portion of the angle steel of the rigid member 21 to complete the vibration damping mechanism 20. The function of the vibration damping mechanism of the third embodiment is the same as that of the second embodiment.

A fourth embodiment is shown in FIGS. 13 to 15, in which the long rigid member 21 is formed by cutting an H-shaped steel to a predetermined length, and the web 2 in the central portion of the long rigid member 21 is cut as in the second embodiment.
It is formed by forming bolt through holes 21c at the centers of the webs 21b at two positions which are at the same distance in the longitudinal direction from the center of the 1b and the central portion. The H-shaped steel beam 30 of the structural body is bolted through the bolts through holes 21c of the web 21b of the long rigid member 21 at symmetrical positions on both sides of the web 30b of the upper flange 30a of the swingable central portion. A hole 30c is formed. Further, the spacing member 22F is formed to be larger than half the dimension of the flange 21a of the rigid member 21 in the width direction, and a bolt through hole is formed at the center thereof. Flange 21a of long rigid member 21
In the vertical direction, the trunk portion of the bolt b is passed through the bolt through hole 21c of the rigid member 21, and then the spacing member 22F is fitted into the bolt b, and the tip portion of the bolt b is attached to the steel beam 30.
Through each bolt through hole 30c, and tighten the nut n by screwing it in, and fixing the pair of rigid members 21 at symmetrical positions on both sides of the lower web 30b of the upper flange 30a of the steel frame beam 30. Free. Then, the viscous body 23 is provided between the upper side of the web in the portion from the tip of each rigid member 21 and the lower side of the flange 30a on the upper side of the steel beam 30.
The viscous container 25 containing the
The resistor 26 is fixed to the flange 30a of the steel beam 30 corresponding to. The resistor 26 is constructed by fixing the lower end of a bolt 26b to the center of the upper surface of a resistor plate 26a which is slightly smaller than the outer shape of the viscous container 25 in plan view, and screwing a support nut 26c into the bolt 26b. The tip portion of 26b is passed through a bolt through hole 30d formed in the upper flange 30a of the steel beam 30, and tightened with a nut n to fix the resistor 26 to the steel beam 30, and the lower surface of the resistance plate 26a and the viscous container 25 are fixed. The viscous body 23 exists between the bottom surface and the bottom surface, and the vibration damping mechanism 20 is completed. Since the viscous body 23 is housed in the viscous body container 25 in the fourth embodiment, there is no risk of the viscous body 23 flowing out. In addition, the steel beam 30 that constitutes the structure
The resistance body 26 is fixed to the viscous body 23 via the resistance plate 26.
Therefore, even if the surface of the steel beam 30 that constitutes the structure is subjected to fire resistance, the refractory material does not interfere. Furthermore, since the gap between the long rigid member 21 and the structure can be increased, the degree of freedom in the installation position of the rigid member 21 increases.

The fifth embodiment is shown in FIGS. 16 and 17, and in place of the long rigid member 21 of the H-section steel of the fourth embodiment, a portion of the web 21b of the pair of light groove sections 21A and 21B is superposed. This is an example of using a long rigid member 21 made by. The long rigid member 21 may be formed by superposing the web portions 21b of the pair of light groove shaped steels 21A and 21B and integrally joining them, but the web portion 21b of the upper light groove shaped steel 21A and the lower light groove shaped portion 21b may be combined. It is preferable that a viscoelastic material layer 28 is interposed between the steel 21B and the web 21b to form a rigid vibration damping member, and this rigid vibration damping member is used as the long rigid member 21. The pair of light groove steels 21A and 21B are provided with three bolt through holes 21c at the same positions as in the second embodiment. The spacing member 22G is formed by a plate-shaped member having a bolt through hole at a position corresponding to the bolt through hole 21c. The spacing holder 22G is applied to the center of the surface of the web 21b on the side where the flange 21a of one light groove shaped steel 21A does not project,
A viscoelastic body 28a having a high vibration damping ability is thinly attached to the surface not contacted with the spacing member 22G to form a viscoelastic body layer 28 having substantially the same thickness as the spacing member 22G. And the flange 21a of the other light groove section steel 21B
The surface of the web 21b on the side not protruding is attached to the surface of the viscoelastic body layer 28 to form the long rigid member 21. The flanges 21a of the light groove shaped steels 21A and 21B of the rigid member 21 are provided at symmetrical positions on both sides of the web 30b of the upper flange 30a of the swingable central portion of the steel beam 30 of the structure.
Bolt through holes 30c are formed so as to correspond to the bolt through holes 21c. Bolt b to a pair of light groove steel 2
After passing through the bolt through holes 21c of 1A and 21B and the bolt through holes of the spacing member 22G, the bolts b
The same space holding member 22F as that in the fourth embodiment is fitted to the front side portion of each of the bolts, and the front portion of the bolt b is attached to each bolt through hole 3 of the steel beam 30.
0c, and screw in the nut n to tighten it. Then, the pair of rigid members 21 is fixed to the upper flange 30a of the steel beam 30, so that the pair of rigid members 21 come to symmetrical positions on both sides of the lower web 30b of the upper flange 30a of the steel beam 30, Free the parts on both sides in the longitudinal direction except the fixed part. Viscous container 25 and resistor 2
The configuration of No. 6, the method of attaching them to the rigid member 21 and the steel beam 30, and the like are the same as in the fourth embodiment. In the fifth embodiment, since the long rigid member 21 itself has the vibration damping performance, the vibration damping force by the long rigid member 21 is added, and the vibration damping force of the vibration damping device 20 is doubled.

In the fourth and fifth embodiments, instead of the viscous body container 25 containing the viscous body, the viscous body bag 24 containing the viscous body can be used. Alternatively, the resistor 26 may be attached so that the gap between the resistor 26 and the rigid member 21 becomes small, and the viscous body 23 may be inserted into the gap using a whirlpool or the like. In addition, the long rigid member 21 and the resistor 26 are connected to the steel beam 30 by using bolts b, nuts n and the like.
When fixing to the flange 30a of
A washer is interposed between the head of the bolt b, the nut n, the long rigid member 21, the support nut 26c of the resistor 26, the flange 30a, the spacing member, and the like.

[0016]

The present invention has the following effects (a) to (i) by having the structure described in the claims. (A) According to the first aspect, the structure of the vibration damping mechanism becomes very simple, and its fabrication, mounting to a structure, etc. become very easy. By adjusting the installation position of the viscous body, the contact area, etc., it is possible to easily obtain the optimum attenuation amount. (B) According to the second aspect of the present invention, a long rigid member is attached to the structure or a viscous body is interposed to facilitate the work, and the dead space between the flanges of the H-shaped steel beam can be effectively used, which is simple. The vibration damping mechanism can be covered with a simple cover. (C) According to the third aspect of the present invention, even if the distance between the free portion of the long rigid member and the portion of the structure facing the long rigid member is large, the attachment resistance to the long rigid member or the structure is high. Due to the presence of the body, the gap between the surface of the resistor and the surface of the long rigid member or the structure can be set to a predetermined value, and the degree of freedom in the installation position of the vibration damping mechanism is increased. (D) According to the fourth aspect, since it is only necessary to interpose the bag body in which the viscous body is enclosed between the long rigid member and the structure, it is possible to reduce the cost and time required for its production, mounting, etc. .. Further, there is no fear that the viscous body will flow out. (E) According to the fifth aspect, operations such as adjusting the viscosity of the viscous body and exchanging the viscous body are facilitated. (F) When a rigid damping member is used as the long rigid member as described in claims 6 and 7, the damping force of the rigid damping member itself is applied, so that the damping force of the damping mechanism can be doubled. it can. (G) According to the eighth aspect, the degree of freedom of attachment to the structure can be increased. (H) According to claim 9, when the natural frequency of the structure to which the vibration damping mechanism is attached is substantially determined, the natural vibration of the vibration damping device is parallel to the work of mounting the vibration damping device. The number and the like can be easily adjusted in a wide range. (I) When the vibration damping mechanism of the present invention is used, the degree of freedom of the installation location of the vibration damping mechanism is increased, and the vibration damping mechanism can be installed in the dead space of the building space. In addition, the adjustment range is wide and tuning work is easy.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of the principle of a vibration damping mechanism of the present invention.

FIG. 2 is a front view of the vibration damping mechanism according to the first embodiment.

FIG. 3 is an enlarged front view of the left half of FIG.

FIG. 4 is a side view of FIG. 2 taken along the line AA and viewed in the direction of the arrow.

5 is a side view of FIG. 2 taken along the line BB and viewed in the direction of the arrow.

6 is a side view in which the long rigid member is replaced by a long rigid vibration damping member, taken along the line AA in FIG. 2 and viewed in the direction of the arrow.

FIG. 7 is a side view of the long rigid member replaced with a long rigid vibration damping member, taken along the line BB of FIG. 2 and viewed in the direction of the arrow.

FIG. 8 is a side view of the vibration damping mechanism of the second embodiment, taken along the line AA of FIG. 2 and viewed in the direction of the arrow.

9 is a side view of the vibration damping mechanism according to the second embodiment, taken along the line BB of FIG. 2 and viewed in the direction of the arrow.

FIG. 10 is a side view of another viscous body arrangement of the vibration damping mechanism of the second embodiment, taken along the line BB of FIG. 2 and viewed in the direction of the arrow.

FIG. 11 is a side view of the vibration damping mechanism of the third embodiment taken along the line AA of FIG. 2 and viewed in the direction of the arrow.

FIG. 12 is a side view of the vibration damping mechanism of Example 3 taken along the line BB of FIG. 2 and viewed in the direction of the arrow.

FIG. 13 is a front view of the left half of the vibration damping mechanism of the fourth embodiment.

FIG. 14 is a side view of the vibration damping mechanism of the fourth embodiment as seen in the direction of the arrow, taken along the line CC in FIG.

FIG. 15 is a side view of the vibration damping mechanism of the fourth embodiment as seen in the direction of the arrow, taken along the line DD in FIG.

16 is a side view of the vibration damping mechanism of the fifth embodiment, taken along the line CC in FIG. 14 and viewed in the direction of the arrow.

FIG. 17 is a side view of the vibration damping mechanism of the fifth embodiment, taken along the line DD in FIG. 14 and viewed in the direction of the arrow.

[Explanation of symbols]

 10 Vibration Control Mechanism 11 Long Rigid Member 12 Fixed Part 13 Structure 20 Vibration Control Mechanism 21 Long Rigid Member 21a Flange 21b Web 21c Bolt Through Hole 22A to G Interval Holding Member 23 Viscous Body 24 Viscous Body Bag Body 25 Viscous Body Container 26 Resistor 28 Viscoelastic body layer 29 Restraint plate 30 Steel beam 30a Flange 30b Web 30c Bolt through hole 30d Bolt through hole 32 Cover b Bolt n Nut

Claims (9)

[Claims] 1. A long rigid member is fixed to a structure at a central portion thereof, and a portion other than the fixed portion is freed, and a free portion of the long rigid member and a portion of the structure facing this portion. A damping mechanism characterized in that a viscous body is interposed between and. 2. A long rigidity is provided at symmetrical positions on both sides of the lower web of the upper flange of the steel beam of H-section steel constituting a part of the structure or at both symmetrical positions of both webs of the upper flange of the lower flange. The member is arranged parallel to the web surface and the flange surface, the central part of the long rigid member is fixed to the flange, and the part other than the fixed part is freed, and the free part of the long rigid member and this part A damping mechanism characterized in that a viscous body is interposed between the opposing flange portions. 3. A long rigid member is fixed to a structure at a central portion thereof, and a portion other than the fixed portion is freed, and a free portion of the long rigid member and a portion of the structure facing the free portion. Characteristic is that a viscous body and a resistor are arranged between the two, the resistor is attached to a long rigid member or structure, and the viscous body is interposed between the surface of the resistor and the surface of the long rigid member or structure. Vibration control mechanism. 4. The vibration damping mechanism according to claim 1, wherein the viscous body is enclosed in a bag and interposed. 5. A long rigid member is fixed to a structure at a central portion of the long rigid member, and a portion other than the fixed portion is made free, and a free portion of the long rigid member and a portion of the structure opposite to the free portion. Place a container containing a viscous body between the resistor and the resistor, attach the container to the upper side of the long rigid member or structure, attach the resistor to the lower side of the long rigid member or structure, and attach the lower surface of the resistor and the container. A damping mechanism characterized by the presence of a viscous body between the bottom surface of and. 6. A composite body composed of a long steel member and a viscoelastic body having a high vibration damping ability attached to the surface of the long steel member is used as the long rigid member. The damping mechanism described. 7. The vibration damping mechanism according to claim 1, wherein a member made of an alloy having a high vibration damping ability is used as the long rigid member. 8. A long rigid member is formed by disposing two long members separated from each other on the same central axis line with one ends thereof facing each other.
The vibration damping mechanism according to any one of the items. 9. A long rigid member is fixed to a structure at a central portion thereof, and a portion other than the fixed portion is freed, and a free portion of the long rigid member and a portion of the structure facing this portion. In a vibration control mechanism in which a viscous body is interposed between the viscous body and the viscous body, one of the length of the long rigid member, the viscosity of the viscous body, the placement position of the viscous body with respect to the long rigid member, and the contact area between the viscous body and the rigid member A tuning method for a vibration damping mechanism, characterized by adjusting the tuning.