JPH0814207B2 - Building damping device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vibration damping device that suppresses vibration generated in a building during an earthquake or strong wind.

(Prior art) In high-rise buildings, the period of swaying during earthquakes and strong winds is long, and even after the earthquake or strong winds subsides, it continues to give a feeling of badness and fear. It is common practice to install a damping device in the uppermost tank part, which has the largest width, whose period matches the natural vibration period of the entire building.

Such a vibration damping device is disclosed, for example, in JP-A-63-17.
As described in Japanese Patent No. 1965, a tank containing a liquid is installed at the top of a high-rise building, and when the building starts to vibrate due to an external force vibrating due to an earthquake or strong wind, the liquid is delayed with a phase delay of a predetermined period. It is known that the vibration energy of a building is absorbed by vibrating the building to suppress the shaking of the building.

(Problems to be Solved by the Invention) However, according to the vibration damping device including the liquid tank as described above, the vibration cycle of the liquid stored in the tank changes depending on the size and volume of the tank, the mass of the liquid, and the like. Therefore, it is difficult to set the vibration cycle of the liquid in any direction of the building vibrating in the horizontal direction so as to match the natural vibration cycle of the building.

In addition, it is preferable to design the damping device to have a weight that is about one-hundredth of the entire building. However, if liquid is used, the entire device becomes large and requires a large installation space, and the liquid deteriorates or evaporates. In that case, there is a problem that a predetermined natural vibration period cannot be obtained.

For this reason, the inventors of the present application installed on the floor of the building a vibration damping mechanism in which a cylindrical roller member having a predetermined diameter is interposed between the upper and lower clamping members having arc surfaces having a predetermined radius on the opposing surfaces,
Place the weight on the upper clamping member of this damping mechanism,
An apparatus has been developed in which the period in which the weight oscillates is matched with the natural oscillation period of the entire building, and the horizontal vibration damping action of the building is effectively exhibited.

However, the natural vibration period of the building changes due to the rigidity of the slab and finishing material, the difference in the estimated load, etc. between the time of design and the time of completion of the building. Will be reduced.

Therefore, the vibration damping device may be installed after the building is completed, but this has a problem that the construction period is long and the construction cost is high.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a building vibration damping device capable of finely adjusting the swinging cycle of a weight with a simple structure and exhibiting a highly accurate vibration damping action. Is.

(Means for Solving the Problem) In order to achieve the above object, a vibration damping device for a building according to the present invention includes a cylindrical roller member having a predetermined diameter between upper and lower pressing members having arc surfaces having a predetermined radius on opposing surfaces. An apparatus for damping vibrations in a horizontal direction of a building by installing an interposing vibration damping mechanism on a floor of a building and placing a weight on an upper clamping member of the vibration damping mechanism. It has a structure in which a flywheel is attached.

(Operation) When a building vibrates due to an earthquake or the like, the weights start to vibrate in the same direction with a phase delay of a predetermined period, and the upper clamping member of the vibration control mechanism supporting the weights clamps the lower portion through the roller member. By vibrating on the arc surface of the member, the vibration energy of the building is absorbed and the vibration is suppressed.

At this time, the flywheel rotates integrally with the roller member, and the natural period of the weight changes depending on the magnitude of the moment of inertia of the flywheel. Therefore, the damping mechanism was installed on the building floor in parallel with the building construction. After that, if the moment of inertia of the flywheel is adjusted so that the vibration cycle of the weight coincides with the natural vibration cycle of the building, a highly accurate vibration damping action can be exhibited.

The inertial moment of the flywheel can be easily adjusted by changing its mass or radius.

(Examples) Explaining an example of the present invention with reference to the drawings, in Fig. 1, (A) is a vibration damping device of the present invention installed in the center on the floor (C) on the uppermost floor of a building (B). It is a device.

As shown in FIG. 2, the vibration damping device (A) has a floor (C).
Lower damping mechanism (A ₁ ) arranged in at least three places so as to be the top position of the upper triangular shape and the upper portion arranged in a superposed state on each lower damping mechanism (A ₁ ). a damping mechanism (a _2), and is configured from these upper damper (a ₂₎ is placed in a bridged state on the weight (a _3).

The lower damping mechanism (A ₁ ) and the upper damping mechanism (A ₂ ) have the same structure, and as shown in FIG. 3, the opposing surfaces are formed on the same circular arc surface (4) with a predetermined radius r _2. A cylindrical roller member (3) having a predetermined radius r ₁ is interposed between the upper and lower clamping members (1) and (2) in a clamped state.

Further, as shown in FIG. 4, the roller member (3) is provided with a center portion of a flywheel (13) having a desired mass and radius on the center shafts (3a) (3a) projecting from both end surfaces thereof. It is fixed so that it can be replaced, and can rotate integrally with the roller member (3).

It should be noted that, when the upper and lower clamping members (1) and (2) relatively swing in the direction of the circular arc through the roller members (3) during vibration, to reliably swing without slipping. In addition, the upper and lower clamping members (1) and (2) and the circular arc surface (4) and the peripheral surface of the member (3) are formed into uneven rough surfaces, or as shown in FIG. Racks (5), which are formed at the same degree of curvature as the circular arc surface (4) over the entire length, are integrally provided on both end edges of the circular arc surface (4) of the members (1) and (2), and the roller member (3). ) May be formed with pinions (6) meshing with these racks (5) or provided integrally with them.

Further, while forming an arcuate groove (7) in the center of the opposing arcuate surfaces (4) and (4) of the upper and lower clamping members (1) and (2),
A ring-shaped ridge (8) loosely fitted in the arcuate groove (7) is provided at the center of the roller member (3), and the upper and lower clamping members (1) are provided.
(2) However, the member (3) and the member (3) are configured so that they can be accurately moved relative to each other in the direction of the arc surface (4).

In the vibration damping mechanism (A ₁ ) (A ₂ ) configured in this way, the lower vibration damping mechanism (A ₁ ) moves its roller member (3) in the same direction (the front-back direction of the building (B) in the figure). The lower clamping member (1) is fixed on the floor (C) so as to face the upper clamping member (2) of the lower damping mechanism (A ₁ ).
An intermediate plate (9) is placed and fixed on the upper plate, and an upper damping mechanism (A ₂ ) is mounted on the intermediate plate (9) and its roller member (3).
Are oriented in the direction perpendicular to the roller member (3) of the lower damping mechanism (A ₁ ) (in the figure, the left-right direction of the building (B)) and overlap each lower damping mechanism (A ₁ ). Thus, the lower clamping member (1) is fixed.

In this case, the intermediate plate (9) is not always necessary, and as shown in FIG. 5, the upper clamping member (2) of the lower damping mechanism (A ₁ ) and the lower side of the upper damping mechanism (A ₂ ) are A lower damping mechanism is provided with an intermediate pressing member (10) having an integrated shape with the pressing member (1), that is, an intermediate pressing member (10) having arcuate surfaces (4) (4) formed on the upper and lower surfaces of one member in directions orthogonal to each other. (a ₁₎ may be the upper press member (2) arranged structure between the lower press member (1) and the upper vibration damping mechanism (a ₂₎ of the.

Furthermore, it placed in a bridged state on the upper vibration damping mechanism (A _2), a fixed weight (A ₃₎ is equipment such as ice heat storage tank having a desired weight is used.

And, like this, the floor (C) on the top floor of the building (B)
The damping device installed in the upper center is 1 / 100th of the whole building
It is set to have a moderate weight.

With this configuration, when an earthquake occurs or the building (B) vibrates in the left-right direction due to strong winds, the weight (A ₃ ) also starts oscillating with a phase delay of a predetermined period, and the building (B) vibration energy is converted into vibration energy of the weight (a ₃₎ in which sway of the building (B) is suppressed.

In this case, weights swing of (A ₃₎ is carried out by building the upper damping mechanism having a lateral rolling direction (B) arc surface (4) (A _2), the upper vibration damping mechanism (A ₂ ) Upper and lower clamping members (1) and (2) are opposed circular arc surfaces (4) of these members.
(4) The roller member (3) interposed between (4) relatively swings in the left-right direction through the rolling motion.

Similarly, when the building (B) vibrates in the front-rear direction, the building (B) is damped through the lower damping mechanism (A ₁ ) provided with the arcuate surface (4) in that direction.

Therefore, the building (B) is installed by the vertical damping mechanism (A ₁ ) (A ₂ ).
Vibrations acting in any direction in the horizontal plane can be damped.

Where T: natural vibration period of the damping device M: mass of weight m ₁ : mass of roller member m ₂ : mass of flywheel r ₁ : radius of roller member r ₂ : radius of arc surface of clamping member r: r ₂ −r ₁ I ₂ : rotational moment of inertia of flywheel g: gravitational acceleration. The natural vibration period T of the vibration damping device with the flywheel (13) attached is determined by the following equation.

As is clear from this equation, the natural vibration period T of the braking device can be changed by the magnitude of the rotational inertia moment I ₂ of the flywheel (13), that is, the mass and radius of the flywheel (13). After the completion of the building (B) and the vibration control device (A), the period in which the weight (A ₃ ) oscillates during vibration matches the oscillation period of the sway of the entire building by mounting the flywheel (13) with a specified mass and radius. By doing so, the shaking of the building is set to the minimum.

Further, when it is necessary to further finely adjust the vibration cycle due to aging of the building or the like, it is possible to cope with this by attaching a weight to the flywheel (13) separately.

When the width of the front side and the width of the side of the building (B) are different, such as a rectangular cross section, the natural vibration cycle of the building swaying in these directions is different, so that it corresponds to each swaying direction. Clamping member (1) for the vertical damping mechanism (A ₁ ) (A ₂ )
Radius r ₂ of arc surface (4) of (2) and radius of member (3)
r ₁ is set so as to have the same vibration period as the natural vibration period of the building. Also, if the building (B) has an elongated cross-sectional shape, it will sway only in the short side direction. It suffices to provide only one damping mechanism that absorbs shaking in that direction.

Further, in the above description, it is described that the vibration having the same period as the natural vibration period of the building (B) is damped by the vibration damping device (A), but an earthquake includes vibrations of various frequencies. Such fluctuating vibration does not greatly shake the building (B), but since it impairs habitability, as shown in FIG. 2, the floor (C) on the top floor and the damping device (A) are between the intermediate plate (9), and the weight member (a ₃₎ perpendicular to oil damper (11) (12) respectively mutually actuating direction formed by connecting the ends of the hydraulic cylinders between the intermediate plate (9) The oil dampers (11) and (12) are arranged in such a state that the fluctuation vibrations as described above are absorbed.

(Effects of the Invention) As described above, according to the vibration damping device of the present invention, a vibration damping mechanism in which a cylindrical roller member having a predetermined diameter is interposed between upper and lower pressing members having arc surfaces having a predetermined radius on opposing surfaces. Is installed on the floor of the building and the weight is placed on the upper clamping member of this vibration control mechanism, so when the building is rocked by an earthquake or strong wind, the weight member is not curved on the upper and lower clamping members. However, the vibration of the building can be reliably damped by swinging the member.

Further, in the vibration damping device of the present invention, since the flywheel is attached to the cylindrical roller member, the flywheel rotates integrally with the roller member and the natural period of the weight changes depending on the magnitude of the moment of inertia thereof. Can be
Therefore, it is possible to easily and accurately match the vibration cycle of the weight with the natural vibration cycle of the building by adjusting the moment of inertia of the flywheel after installing the damping mechanism on the building floor in parallel with the building construction. In spite of a change in rigidity of the entire building, it is possible to provide a vibration damping device having a high precision and a simple structure, which is suitable for the building.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a simplified front view of the entire building in which a vibration damping device is installed, FIG. 2 is a simplified front view of the vibration damping device, and FIG. FIG. 4 is an enlarged front view showing a combined state of the upper and lower vibration damping mechanisms, FIG. 5 is a simplified perspective view showing a modified example of the vibration damping device of the present invention, and FIG. It is a vertical section front view showing another example. (A) …… Vibration damping device, (A ₁ ) (A ₂ ) …… Vibration damping mechanism,
(A ₃ ) …… weight, (C) …… floor, (1) (2) ……
Upper and lower clamping members, (3) …… Roller members, (4) …… Arc surface, (13) …… Handwheel.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Yokota 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka City, Osaka Prefecture Okumura Gumi Co., Ltd. ) References JP-A-3-169984 (JP, A)

Claims (1)

[Claims] 1. A vibration damping mechanism, in which a cylindrical roller member having a predetermined diameter is interposed between upper and lower pressing members having arc surfaces having a predetermined radius on opposing surfaces, is installed on a floor of a building, and A device for damping a horizontal vibration of a building by mounting a weight on an upper clamping member, wherein a flywheel is attached to the cylindrical roller member, and a building vibration damping device is provided.