JP3026772B2 - Structure damping mechanism - Google Patents

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 reducing vibration of a structure such as a building and a method of manufacturing the same.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication No. Hei 7-247727 discloses a conventional vibration damping mechanism capable of efficiently reducing the vibration of a structure using a viscoelastic body. According to this publication, a pair of first frame members is provided on each of the opposite frame members 2 of the structure.
The support shaft 11 and the second support shaft 13 are attached at appropriate intervals,
A first fixed plate 12 rotatable with respect to the support shaft 11 and a second fixed plate 14 rotatably mounted with respect to the second support shaft 13 are opposed to each other with a gap therebetween. A vibration damping mechanism for filling the body, the vibration damping mechanism having a conversion coefficient β = L
/ H is selected for the viscoelastic body.

[0003]

As the vibration damping mechanism, a viscoelastic body having a conversion coefficient β = L / h is selected, and the production of the vibration damping mechanism is troublesome. In addition, the vibration damping mechanism of a building using a viscoelastic body is for large-scale buildings, and is used for small-scale buildings such as wooden houses and lightweight steel-framed houses.
A simple mechanism is desired in consideration of the price. Accordingly, the present invention provides a vibration damping mechanism that can reduce the vibration of a structure efficiently with a simpler configuration.

[0004]

A vibration damping mechanism 10 according to the present invention.
A to 10C are fixed to an upper frame member of the structure and provided with a first support shaft, and are fixed to a lower frame member opposed to the upper frame member at an appropriate distance from the upper frame member and have a second support plate. A second fixed plate provided with a shaft and a connecting plate rotatably mounted on the first and second support shafts are opposed to the first fixed plate and the second fixed plate with a gap therebetween, and the connection is performed. Between the plate and the first fixed plate
The gap and the gap between the connecting plate and the second fixing plate are filled with a viscoelastic body. These vibration damping mechanisms 10A to 10C
Since the viscoelastic body can be selected according to the positions of the first support shaft and the second support shaft, the vibration damping mechanism can be easily manufactured.

[0005]

[0006]

[0007]

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings. FIG. 1A shows a vibration damping mechanism 10 installed on a frame structure.
A, 10B, and 10C are front views, and FIG. 1A and 1B, a horizontal member (frame member) 2 is provided between columns (frame members) 1 and 1 as vertical members erected at predetermined intervals. 10A is a vibration damping mechanism installed between the opposed horizontal members 2, and the vibration damping mechanism 10A is composed of the support shafts 11a and 13a and the first fixed plate 1
2a, second fixed plate 14a, connecting plate 15a and viscoelastic body M
a (Ma1, Ma2).

The first fixed plate 12a is fixed to the upper frame member 2a of the structure, and the first fixed plate 12a has a first fixed plate 12a.
The support shaft 11a is provided on the upper frame member 2a side. Further, the flat second fixing plate 14a is attached to the lower frame member 2b facing the upper frame member 2a at an appropriate distance from the upper frame member 2a.
a is fixed with a gap 6 (a distance at which the tilting first fixed plate 12a and the second fixed plate 14a do not come into contact with each other), and the second support shaft 13a is attached to the second fixed plate 14a by the lower frame member 2b. It is provided on the side. The distance between the upper frame member 2a and the lower frame member 2b is h, and the distance between the first support shaft 11a and the second support shaft 13a is La.
It is.

The flat connecting plate 15a is connected to the first support shaft 11
a and the second support shaft 13a so as to be rotatable. The first fixed plate 12a and the second fixed plate 14a are opposed to each other with a gap 5, and the gaps 5 are filled with viscoelastic materials Ma1 and Ma2.
The viscoelastic bodies Ma1 and Ma2 are filled under the first support shaft 11a and above the second support shaft 13a, respectively, depending on the positions of the first support shaft 11a and the second support shaft 13a.

The vibration damping mechanism 10B includes the vibration damping mechanism 10
A has substantially the same configuration as that of the first embodiment.
It is composed of a fixed plate 12b, a second fixed plate 14b, a connecting plate 15b, and a viscoelastic body Mb (Mb1, Mb2). In the vibration damping mechanism 10B, the positions of the first support shaft 11b and the second support shaft 13b are formed on the free ends of the first fixed plate 12b and the second fixed plate 14b, respectively, and the distance is Lb. . Therefore, the viscoelastic bodies Mb1 and Mb2 are placed above the first support shaft 11b and the second support shaft 13b.
b. Fill the lower side. The vibration damping mechanism 10C has substantially the same configuration as that of the vibration damping mechanism 10A.
c, the first fixed plate 12c, the second fixed plate 14c, the connecting plate 1
5c and a viscoelastic body MC (Mc1, Mc2).
The vibration damping mechanism 10C moves the position of the first support shaft 11c to the first position.
The position of the second support shaft 13c is provided on the lower frame member 2b side on the free end side of the fixing plate 12c, and the distance is Lc. Therefore, the viscoelastic bodies Mc1 and Mc2 are placed above the first support shaft 11c,
The upper part of the second support shaft 13c is filled.

As the viscoelastic body M (Ma, Mb, Mc), for example, asphalt containing an organic polymer is used. FIG. 2 shows the mechanical characteristics of the viscoelastic body M, and the horizontal axis represents the amplitude V (or velocity S, which is the shear deformation amount of the viscoelastic body) acting on the viscoelastic body M. ing. Incidentally, in the same structure, the amplitude V and the speed S are in a proportional relationship, meaning that they are the same. The vertical axis is the resistance force per unit area f
Is represented.

As is clear from FIG. 2, the mechanical properties of the viscoelastic body M differ depending on the type. Generally, in the case of a hard material MX, the resistance gradient is large and the amplitude (deformation amount) V is small. High resistance f can be obtained,
When the amplitude V is large, the resistance f decreases rapidly and the function is lost, and the limit amplitude value Vc1 is small. On the other hand, in the case of the soft material MY, although the resistance gradient is small and the resistance value f is lower than that of the hard material Ma for the same amplitude value, the material MY can withstand a large amplitude V and its limit amplitude value Vc2 is It has the property of being large.

Next, FIG. 3 shows a vibration damping effect when a vibration having an amplitude Vi (a mutual deformation amount of the upper frame member 2a and the lower frame member 2b) is applied to the vibration damping mechanism 10A in the horizontal direction.
This will be described with reference to FIG. As shown in FIG.
Let the distance between a and the second support shaft 13a be La, the distance between the first support shaft 11a and the center of the viscoelastic body Ma1 be Sa, and the distance between the second support shaft 13a and the viscoelastic body Ma2 be Ta. The first fixing plate 12a and the second fixing plate 14a fixed to the upper frame member 2a and the lower frame member 2b.
Is very small and is ignored.

The first support shaft 1 is controlled by the horizontal amplitude Vi.
The amount of deformation of 1a is also Vi, and in the connection plate 15a, the positional relationship between the first fixed plate 12a and the second fixed plate 14a is the angle θa with the first support shaft 11a and the second support shaft 13a as the center of rotation. Performs amplitude operation of minute displacement. Therefore, the deformation amount of each viscoelastic body is the deformation amount V1 of the viscoelastic body Ma1 (= Sa * ta).
n (θa)), the deformation amount V2 of the viscoelastic body Ma2 (= Ta * ta)
n (θa)). Here, tan (θa) = Vi / La
It is. Accordingly, the deformation amount V1 of the viscoelastic body Ma1 (= Sa · V
i / La), the deformation amount V2 of the viscoelastic body Ma2 (= Ta · Vi / L)
a), and by appropriately selecting La, Sa, and Ta, the viscoelastic body M capable of maximizing the effect of energy absorption is obtained.
a1, Ma2 (Ma1 = Ma2 may be selected) can be selected.

In the above relation, the conversion coefficient β1 =
Assuming that Sa / La and the conversion coefficient β2 = Ta / La, the amplitude V of the viscoelastic body is related to the distance La between the first support shaft 11a and the second support shaft 13a, and can be expressed by V = β · Vi. In addition, the distances Lb, Sb, Tb, Lc, and Lc shown in FIG. 3 corresponding to the vibration damping mechanism 10A are also provided for the vibration damping mechanisms 10B and 10C.
By selecting Sc and Tc, it is possible to select the viscoelastic bodies Mb and Mc that can obtain the most effect.

The selection of the viscoelastic body Ma (Ma1, Ma2) in the vibration damping mechanism 10A will be specifically described with reference to FIG. (1) When distance Sa> distance Ta is selected, La>Sa> Ta
And β2 <β1 <1. And the vibration damping mechanism 10
Assuming that the amplitude Vi occurs in A, the deformation amount of each viscoelastic body is the deformation amount V1 of the viscoelastic body Ma1 (= β1 · Vi) and the deformation amount V2 of the viscoelastic body Ma2 (= β2 · Vi). Accordingly, since the deformation amount V1 is larger than the deformation amount V2, when the viscoelastic body Ma1 selects the viscoelastic body MX and the viscoelastic body Ma2 selects the viscoelastic body MY, the resistance force f1 (f1 <f2). Get) As described above, the viscoelastic bodies Ma1 and Ma2 in the vibration damping mechanism body 10A are provided.
Can select appropriate viscoelastic bodies MX and MY,
Energy can be effectively absorbed. (2) If distance Sa is selected as distance Ta, then La> Sa = Ta
And β2 = β1 <1, so that the viscoelastic bodies Ma1, M
The deformation amounts V1 and V2 of a2 are the same. Therefore, the distance S is set so as not to reach the limit amplitude value Vc1 (or Vc2) of the viscoelastic body.
a (= Ta) and a viscoelastic body can be selected.

In the vibration damping mechanism 10B, if (1) Sb>Tb> Lb, then 1 <β2 <β1. (2) If Sb>Lb> Tb, 1 <β1, β2 <1
Becomes (3) If Lb>Sb> Tb, β2 <β1 <1. Thus, the distance between the first support shaft 11b and the second support shaft 13b is Lb, and the distance between the first support shaft 11b and the center of the viscoelastic body Mb1 is Sb.
b, By appropriately selecting the distance Tb between the second support shaft 13b and the viscoelastic body Mb2, the amplitude Vi of the structure can be amplified or reduced. The vibration damping mechanism 10C
Is also the same, and the description is omitted. As mentioned above,
The damping mechanisms 10A, 10B, 10C are La, Sa, Ta
With a simple configuration by changing the distance such as the above, it is possible to efficiently reduce a large deformation to a small deformation of the structure.

The vibration damping mechanisms 10A, 10B, 10
C is a single damping mechanism 10A (10
B, 10c) or a combination of a plurality of them. Further, the vibration damping mechanism is installed not only in the vertical direction such as between the opposing horizontal members, but also between the opposing vertical members (for example, the column 1) depending on the direction of the applied vibration. The present invention is also applicable to a case in which the antenna is installed in a horizontal direction such as a space between opposed beam members (frame members) arranged side by side on a fulcrum.

Next, the vibration damping mechanisms 10D, 10D shown in FIG.
E will be described. The vibration damping mechanism body 10D has substantially the same configuration as the vibration damping mechanism body 10A, but the second fixed plate 14a
The second support shaft 13a is not provided, and the gap 5 between the connecting plate 15a and the second fixed plate 14a is filled with a viscoelastic body M. The distance between the first support shaft 11a and the upper frame member 2a is L1. Further, the vibration damping mechanism 10E is
In D, the position of the first support shaft 11a is changed to a distance L2. Thus, the first support shafts 11a, 11b
Is changed, the amplitude of the viscoelastic body M can be made different even with the same horizontal fluctuation of the upper frame member 2a. Therefore, simply selecting the viscoelastic body by using the vibration damping mechanisms 10C and 10D alone or in parallel, and
Similarly to the embodiment, the horizontal vibration of the structure can be efficiently reduced.

In a vibration damping structure 10F shown in FIG . 5, a first fixing plate 12a and a second fixing plate 14a are overlapped, a viscoelastic body M is filled in the overlapped portion, and fixed to the columns 1 and 1. It is configured. The amplitude of the viscoelastic body M is the distance L between the columns 1 and the distance h between the upper frame member 2a and the lower frame member 2b, and the interlayer amplitude (vertical direction) of the upper frame member 2a and the lower frame member 2b. Therefore, by appropriately selecting h and L and selecting a viscoelastic body, it is possible to efficiently reduce the vertical vibration of the structure. The vibration damping mechanism 10F may be singular in addition to the plurality and juxtaposition, and may be installed between the upper framing member 2a and the lower framing member 2b instead of the column 1 and the column 1, and may be installed horizontally. May be prepared.

Next, a method for manufacturing the vibration damping mechanism will be described with reference to the vibration damping mechanism 10A as an example, the first fixed plate 12a and the connecting plate 1a.
The viscoelastic body M filled between 5a will be described with reference to FIG. FIG. 6A shows the first fixing plate 12 a and the connecting plate 15.
FIG. 1B is a plan view, and FIG. 2B is a conceptual diagram in which a viscoelastic body M is injected. A plurality of guide rods 21 are erected on the first fixed plate 12a at a position where the viscoelastic body M is filled with the connecting plate 15a (preferably substantially circular).
1 inside (or alternately inside and outside) breathable rope (linen, etc.) 2
Put 2. The height of the rope 22 is selected so as to be equal to the height of the viscoelastic body M. On the other hand, an inlet 23 for a viscoelastic body is opened in the connecting plate 15a.

The connecting plate 1 is connected to the first fixing plate 12a.
When the viscoelastic body M is press-fitted from the inlet 23 and the viscoelastic body M is press-fitted from the inlet port 23, the air inside is discharged through the air-permeable rope 22 and the rope 22 is evenly pressurized.
Is formed in a substantially cylindrical shape, and the connecting plate 1 is attached to the first fixed plate 12a.
The state is sandwiched by 5a. As described above, by using the air-permeable rope 22, the viscoelastic body M can easily flow in while discharging air, and the vibration damping mechanism can be manufactured. Note that the guide rod 21 may be provided on the connecting plate 15a, and the shape of the viscoelastic body can be formed depending on the position of the guide rod 21 without being limited to a circle.
Since a uniform pressure is applied by the viscoelastic body, an almost circular shape can be most easily formed.

If the outside of the rope 22 is kept in a negative pressure state, the air entrained in the viscoelastic body M is discharged, and the viscoelastic body M for improving the performance can be filled. As the viscoelastic body M, asphalt or the like containing an organic polymer is used. When the inside of the container 35 is stirred by the stirrer 31 while evacuating air (defoaming) by the vacuum pump 30,
A viscoelastic body M containing no air is obtained. Thereafter, when the viscoelastic body M is press-fitted from the inlet 23 through the high-viscosity pump 32, the efficiency of vibration reduction can be improved by the defoamed viscoelastic body. That is, the defoamed viscoelastic body contributes to the improvement of the shear resistance and the increase of the critical deformation,
It can be a preferred viscoelastic body.

FIG. 7 shows the results of a shear resistance test at a temperature of 30 ° C. for the defoamed viscoelastic material and the undefoamed viscoelastic material. The horizontal axis indicates the amount of shear deformation with respect to the shear thickness of the viscoelastic material. (Δ / d), and the vertical axis indicates resistance (σ). From the measurement results, it is clear that the defoamed viscoelastic body has a larger resistance and a larger amount of shear deformation until breaking.
This is presumed to be because the adhesion area and the shear area between the viscoelastic body and the fixing plate (connecting plate) increase, and that no stress concentration occurs due to air bubbles. In addition, each said vibration suppression mechanism body 1
0A to 10F exemplify a state of being attached to members in a building and members. However, it is needless to say that vibrations can be absorbed between buildings by being attached to members of a certain building and members of another building.

[0026]

The vibration damping mechanisms 10A to 10C of the present invention
Since the connecting plate is configured to be rotatable about the first support shaft and the second support shaft, the viscoelastic body can be selected according to the positions of the first support shaft and the second support shaft, so that it is simple. In addition, a vibration damping mechanism can be manufactured.

[Brief description of the drawings]

FIG. 1A is a front view of vibration damping mechanisms 10A to 10C,
(B) is an A-A cross-sectional view.

FIG. 2 is a characteristic diagram of a viscoelastic body.

FIG. 3 is a diagram illustrating an operation of a vibration damping mechanism.

FIG. 4 is a front view of the vibration damping mechanisms 10D and 10E.

FIG. 5 is a front view of a vibration damping structure 10F.

FIG. 6 is a diagram illustrating the concept of manufacturing a vibration damping mechanism.

FIG. 7 is a diagram showing the results of a tensile test on a defoamed viscoelastic body and an undefoamed viscoelastic body.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E04H 9/02 321

Claims (1)

(57) [Claims] 1. A first fixing plate fixed to an upper frame member of a structure and provided with a first support shaft, and a second support member fixed to an opposing lower frame member at an appropriate distance from the upper frame member. A second fixed plate provided with a shaft and a connecting plate rotatably mounted on the first and second support shafts are opposed to the first fixed plate and the second fixed plate with a gap therebetween, and the connection is performed. Between the plate and the first fixed plate
A damping mechanism for a structure, wherein a viscoelastic body is filled in a gap and a gap between a connecting plate and a second fixing plate .