JPH04161678A - Damping device of building - Google Patents

Abstract

PURPOSE:To take a damping effect of a favourable precision by carrying out fine adjustment of an oscillation cycle of weight in a simple structure by way of providing a flywheel on a cylindrical roller member interposed between upper and lower pinching pressure members. CONSTITUTION:A cylindrical roller member 3 of a specified radius is interposed in the state of sandwiching pressure between upper and lower pinching pressure members 1, 2 formed on the same circular arc surface 4 of a specified radius on its facing surface. Additionally, the central part of a flywheel 13 with desired mass and radius is fixed free to change on a central shaft 3a projectively provided from both edge surfaces on the roller member 3, and the flywheel 13 is provided to rotate integrally with the roller member 3. Then, after a damping system is set on a building floor, the vibration cycle of a weight A2 is made to match the natural vibration cycle of the building.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vibration damping device that suppresses vibrations generated in a building during an earthquake or strong wind.

(Conventional technology) In high-rise buildings, the period of shaking during earthquakes and strong winds is long, and even after the earthquake or strong winds have subsided, it can give a feeling of discomfort and fear even after the earthquake or strong wind has subsided. A vibration damping device whose period corresponds to the natural vibration period of the entire building is installed on the top floor of the building, where it is the largest.

As such a vibration damping device, for example, Japanese Patent Application Laid-Open No. 63-1
As described in Publication No. 71965, a tank containing liquid is installed at the top of a high-rise building, and when the building starts to vibrate due to vibration external force caused by an earthquake or strong wind, the liquid is released with a phase lag of a predetermined period. A structure is known in which the vibration energy of the building is absorbed by vibrating the building, thereby suppressing the shaking of the building.

(Problem to be Solved by the Invention) However, according to the vibration damping device made of a liquid tank as described above, the vibration period of the liquid stored in the tank changes depending on the size and capacity of the tank, the mass of the liquid, etc. Therefore, it is difficult to set the vibration period of the liquid to match the natural vibration period of the horizontally vibrating building in any direction.

In addition, it is preferable to design a vibration damping device to have a weight that is about 1/100 of the entire building, but if a liquid is used, the entire device becomes large and requires a large installation space, and the liquid may deteriorate or evaporate. In this case, there was a problem that a predetermined natural vibration period could not be obtained.

For this reason, the inventors installed on the floor of the building a vibration damping mechanism in which a cylindrical roller member with a predetermined diameter is interposed between upper and lower clamping members whose opposing surfaces have circular arc surfaces with a predetermined radius, and A weight is placed on the upper pressing member of the vibration mechanism so that the period of the weight's oscillation matches the natural vibration period of the entire building, thereby effectively exerting the source vibration action in the horizontal direction of the building. We developed a device configured as follows.

However, the natural vibration period of a building changes between the time of design and the time of building completion due to factors such as the rigidity of slabs and finishing materials, and miscalculations of live loads. will decrease.

For this reason, the vibration damping device may be installed after the building is completed, but this poses the problem of a long construction period and high construction costs.

An object of the present invention is to solve these problems and provide a vibration damping device for a building that is capable of finely adjusting the swing period of the weight with a simple structure and exhibiting a highly accurate vibration damping effect. It is.

(Means for Solving the Problems) In order to achieve the above object, the building vibration damping device of the present invention has the following features:
A vibration damping mechanism in which a cylindrical roller member with a predetermined diameter is interposed between upper and lower clamping members having arcuate surfaces with a predetermined radius on opposing surfaces is installed on the floor of a building, and an upper clamping member of this vibration damping mechanism is installed on the floor of the building. This device dampens horizontal vibrations of a building by placing a weight on it, and has a structure in which a flywheel is attached to the cylindrical roller member.

(Function) When a building vibrates due to an earthquake, etc., the weights start vibrating in the same direction with a phase lag of a predetermined period, and the lower clamping member of the vibration damping mechanism that supported the weights is moved through the roller member. By swinging the pressure member on an arcuate surface, the vibration energy of the building is absorbed and damped.

At this time, the flywheel rotates integrally with the roller member, and the natural period of the weight changes depending on the magnitude of its moment of inertia. If the moment of inertia of the flywheel is adjusted to match the vibration period of the weight with the natural vibration period of the building, a highly accurate vibration damping effect can be achieved.

The moment of inertia of the flywheel can be easily adjusted by changing its mass and radius.

(Embodiment) An embodiment of the present invention will be explained with reference to nine drawings. In Fig. 1, (A) shows the embodiment of the present invention installed in the center on the floor (C) of the top floor of a building (B). It is a vibration damping device.

20 As shown in Figure 2, the vibration damping device (A) includes lower vibration damping mechanisms (AI) arranged at at least three locations on the floor (C) at the top positions of a planar triangular shape; Upper vibration damping mechanisms (A2) arranged in an overlapping state on each lower vibration damping mechanism (A1), and weights (A,) mounted in an erected state on these upper vibration damping mechanisms (A2). It is composed of.

The lower vibration damping mechanism (At) and the upper vibration damping mechanism (A2) have the same structure, and as shown in FIG. A cylindrical roller member (3) with a predetermined radius r1 between the clamping members (1) and (2)
are placed in a pinched state.

Furthermore, as shown in FIG. 4, the roller member (3) has a center shaft (3a) protruding from both end faces thereof, and a center portion of a flywheel 031 having a desired mass and radius can be freely replaced. It is fixed to the roller member (3) so that it can rotate integrally with the roller member (3).

In addition, when the upper and lower clamping members (1) and (2) relatively swing in the direction of their circular arc surfaces via the roller members (3) during vibration,
In order to ensure rocking without slipping, the arcuate surfaces (4) of the upper and lower clamping members (1) and (2) and the circumferential surface of the member (3) should be formed into uneven and rough surfaces. , or, as shown in FIG. 6, a rack ( 5), and pinions (6) meshed with these ranks (5) may be formed at both ends of the roller member (3), or may be provided integrally.

Furthermore, the opposing circular arc surfaces (4) of the upper and lower clamping members (1) and (2)
An arcuate groove (7) is formed in the center of the roller member (4), and a ring-shaped protrusion (8) is provided in the center of the roller member (3) to loosely fit into the arcuate groove (7). The pressure member (IH2) and the balance member (3) are configured to be able to accurately move relative to each other in the direction of the circular arc surface (4).

In the vibration damping mechanism (AI) (AX) configured in this way, the lower vibration damping mechanism (AI) has its roller members (3) facing in the same direction (in the figure, the longitudinal direction of the building (B)). The lower clamping member (1) is fixed on the floor (C), and these lower vibration damping mechanisms (80's upper clamping member (2)
The intermediate plate (9) is placed and fixed on top of the intermediate plate (9), and the upper vibration damping mechanism (A2) is mounted on the intermediate plate (9) with its roller member (3).
) so that it faces perpendicularly to the roller member (3) of the lower vibration damping mechanism (A1) (in the left-right direction of the building (B) in the figure) and overlaps each lower vibration damping mechanism (AI). The lower clamping member (1) is fixed to.

In the second case, the intermediate plate (9) is not necessarily necessary, and the fifth
As shown in the figure, the upper clamping member (2) of the lower vibration damping mechanism (A1) and the lower clamping member (1) of the upper vibration damping mechanism (A2) are integrated into one member. The lower clamping member (1) of the lower vibration damping mechanism (A) is connected to the intermediate clamping member 0ω, which has arcuate surfaces (4) (4) formed in directions perpendicular to each other on the upper and lower surfaces of the lower vibration damping mechanism (A).
It may be arranged between the upper clamping member (2) of the upper vibration damping mechanism (A2) and the upper clamping member (2).

Further, as the weight (A3) placed and fixed in an erected state on the upper vibration damping mechanism (A2), equipment such as an ice heat storage tank having a desired weight is used.

The vibration damping device installed in the center of the top floor (C) of the building (B) is one-hundredth of the entire building.
It is set to have a certain weight.

With this configuration, when an earthquake occurs or when the building (B) vibrates from side to side due to strong winds, way l-(A3) also starts to oscillate with a phase delay of a predetermined period, and the building (B) The vibration energy of the weight (AI) is converted into the vibration energy of the weight (AI), thereby suppressing the shaking of the building (B).

In this case, the swing of the weight (A,) is caused by the upper vibration damping mechanism (A
2), and the upper and lower clamping members (1) and (2) of the upper vibration damping mechanism (A2) are pressed against the opposing circular arc surfaces (4) of these members.
(4) The roller member (3) interposed between the roller members (3) is moved relative to each other in the left-right direction.

Similarly, when the building (B) vibrates in the longitudinal direction, the vibration damping action of the building (B) is performed via the lower vibration damping mechanism (A1) provided with the circular arc surface (4) in that direction.

Therefore, due to the vertical vibration damping mechanism (at) (Ax), the building (B
) can suppress vibrations in any direction in the horizontal plane.

here, T: Natural vibration period of vibration damping device M: mass of weight ml: Mass of roller member m2: Mass of flywheel rI: radius of roller member r2: radius of the circular arc surface of the pressing member r: r, -r.

(2): Rotational moment of inertia of the flywheel g: Gravitational acceleration, then the natural vibration period T of the damping device with the flywheel 03) attached is determined by the following equation.

As is clear from this equation, the natural vibration period T of the braking device
is the magnitude of the rotational moment of inertia I2 of the flywheel 0■,
That is, it can be changed depending on the mass of the flywheel surface and the size of the radius, and after the building (B) and the vibration damping device (A) are completed, the period in which the way (A3) oscillates when vibrating is set to a predetermined mass and radius. By attaching a flywheel surface to match the vibration period of the entire building, the shaking of the building is set to the minimum level.

Furthermore, if the vibration period needs to be further fine-tuned due to aging of the building, etc., this can be done by separately attaching a weight to the flywheel (131).

In addition, if building (B) has a rectangular cross section and the width of the front surface and the width of the side surface are different, the natural vibration period of the building that sways in these directions will be different. The clamping member (1) of the vertical vibration damping mechanism (AI) (AX)
) The radius r of the arc surface (4) in (2), the radius r of the member (3), and the radius r of the member (3) are set to have the same vibration period as the natural vibration period of the building, and the If the cross-sectional shape is elongated, the vibration will only sway in the direction of the short side, so it is sufficient to provide only one vibration damping mechanism that absorbs the vibration in that direction.

Furthermore, although it has been described above that vibrations having the same period as the natural vibration period of the building (B) are attenuated by the damping device (A), earthquakes include vibrations of various frequencies, and this Although such fluctuating vibrations will not shake the building (B) significantly, they will impede livability, so as shown in Figure 2, the top floor (C) and vibration damping device (A) should be between the intermediate plate (9) and the weight member (
Oil dampers 00021, which are formed by connecting both ends of hydraulic cylinders, are disposed between the intermediate plate (9) and the intermediate plate (9) with their operating directions perpendicular to each other, and these oil dampers (II) (12 ) is configured to absorb the above-mentioned fluctuating vibrations.

(Effects of the Invention) As described above, according to the vibration damping device of the present invention, the vibration damping mechanism includes a cylindrical roller member with a predetermined diameter interposed between the upper and lower clamping members whose opposing surfaces have circular arc surfaces with a predetermined radius. is installed on the floor of the building, and the weight is placed on the upper clamping member of the 20 vibration damping mechanism, so when the building shakes due to an earthquake or strong wind, the weight member is placed in the recess of the upper and lower clamping members. It is possible to reliably attenuate the vibrations of a building by swinging it through a curved roller member.

Furthermore, 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 changes the natural period of the weight depending on the magnitude of its moment of inertia. Therefore, after installing a vibration damping mechanism on the building floor in parallel with the construction of the building, the vibration period of the weight can be easily and accurately adjusted to the natural vibration period of the building by adjusting the moment of inertia of the flywheel. Therefore, it is possible to provide a vibration damping device with high precision and a simple structure suitable for the building, regardless of changes in the rigidity of the entire building.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; Fig. 1 is a simplified front view of the entire building in which the vibration damping device is installed, Fig. 2 is a simplified front view of the vibration damping device, and Fig. 3 is the upper and lower clamping members. FIG. 4 is an enlarged front view showing the assembled state of the vertical vibration damping mechanism, FIG. 5 is a simplified perspective view showing a modification of the vibration damping device of the present invention, and FIG. 6 is a diagram of the vibration damping device of the present invention. FIG. 7 is a longitudinal sectional front view showing another embodiment. (A)... Vibration damping device, (At) (ax)... Vertical vibration damping mechanism, (A,)... Weight, (C)... Floor, (
1) (2)... Upper and lower clamping member, (3)... Roller member, (4)... Arc surface, Q31... Flywheel.

Claims (1)

[Claims] (1) A vibration damping mechanism consisting of a cylindrical roller member with a predetermined diameter interposed between upper and lower clamping members having arcuate surfaces with a predetermined radius on opposing surfaces is installed on the floor of the building, and an upper part of the vibration damping mechanism is installed on the floor of the building. 1. A vibration damping device for a building that damps horizontal vibrations of a building by placing a weight on a clamping member, characterized in that a flywheel is attached to the cylindrical roller member.