JPH02154825A - Vibration suppressor for structure - Google Patents

Abstract

PURPOSE:To save the space and obtain a maintenance-free and low-cost vibration suppressor by providing an inertial mass body supported by multistage laminated rubbers from below and a braking device suppressing the horizontal movement of this inertial mass body. CONSTITUTION:A vibration suppressor 1 is constituted of a mass body 5 supported from below by four horizontal deformation sections 4 arranged at four corners of a square and a braking device 6 suppressing the horizontal movement of the mass body 5 when it is horizontally displaced by a preset quantity or above. Laminated rubbers 41 support the mass body 5 from below via support members 43 made of steel. No excess space is required around the mass body, and the space can be saved. A maintenance-free and low-cost vibration suppressor can be obtained.

Description

Detailed Description of the Invention "Industrial Application Field J The present invention relates to a structure vibration suppressing device that suppresses vibrations of a structure that occur when an external force acts on the structure, and particularly relates to The present invention relates to a vibration suppression device for structures that can self-effectively suppress vibrations against external forces.

"Prior Art" Recently, accidents have occurred in high-rise buildings in the United States, such as damage to window glass due to vibrations caused by the building during strong winds. For this reason, devices have been developed and applied to suppress vibrations in buildings during strong winds. Such vibration suppression 1I
An example of an il+ device is a vibration damping device based on a η11100 pressure bearing, which has been confirmed to be somewhat effective.

On the other hand, buildings in Japan, especially high-rise buildings, are designed according to strict 111 earthquake regulations, so they are more rigid than buildings of the same size in the United States. In particular, because many seismic walls are installed inside a building, the yI period stiffness is extremely high.

Therefore, in conventional Japanese buildings, vibrations caused by strong winds have never been a social problem.

1. Problems to be solved by the invention Recently, however, spaces such as hotels and residences where people live or live have become increasingly high-rise, and hotels and apartment buildings exceeding 30 stories are already being built one after another. There is. In addition, high-rise buildings are being actively constructed on soft ground, where until then relatively low-rise buildings were mainly constructed. Because this soft ground is likely to have a predominant long-period component during an earthquake, there is a risk that vibrations that are difficult to prevent with normal seismic design may occur. Furthermore, with the progress of industrialization of building production, new high-strength materials have been developed, and the application of these new materials promotes weight reduction of buildings, making buildings increasingly susceptible to wind vibration ( Become.

In view of such social trends, it is predicted that vibrations of buildings, especially high-rise buildings, during strong winds will become a social problem in our country in the near future. The first concern is that residents of high-rise buildings such as Totel and high-rise apartment buildings will feel uncomfortable and fearful due to the vibrations of the buildings during strong winds. In fact, there are already cases of residents in high-rise buildings complaining of seasickness. Therefore, for high-rise buildings that are planned and designed in the future, we will take into consideration the use, scale, structure, ground conditions, etc. of the building, and if troubles due to vibration of the building due to strong winds etc. are expected, we will It will be necessary to install a suppression device.

The present invention has been made in view of the above circumstances, and is applicable to general high-rise buildings by saving space and reducing costs, and is a structure that fully satisfies safety in the event of a major earthquake. The purpose is to provide a vibration suppression device.

[Means for Solving the Problems] Therefore, the present invention provides an inertia ' The above problem is solved by configuring a vibration suppressing device for a structure consisting of a t'xm body and a braking device that suppresses the horizontal movement when the inertial m body is horizontally displaced by a predetermined amount or more. .

Here, this vibration suppressing device is provided with a buffer at a position that comes into contact with the inertial mass when the inertial mass is horizontally displaced by a predetermined amount or more.

"Embodiments" Examples of the present invention will be described below with reference to the drawings.

1 and 2 are diagrams showing a vibration suppressing device for a structure, which is an embodiment of the present invention. In the figure, what is indicated by the entire reference numeral 1 is a vibration suppressing device for a structure (hereinafter simply referred to as a vibration suppressing device) which is an embodiment of the present invention, and this vibration suppressing device 1 is shown in FIG. As shown in FIG. 3, it is provided on a floor surface F near the roof of a building (structure) 2 via a mounting plate 3.

This vibration suppression device l consists of an 'itm body 5 supported from below by four horizontally deformable parts 4.4, . It is generally composed of a braking device 6 that suppresses horizontal movement of the mass body 6 in stages, and a buffer body 7 attached to a position where the mass body 6 comes into contact with the mass body 6 when the mass body 6 is further horizontally displaced by a predetermined amount or more.

The horizontal deformation part 4 is made of laminated rubber 4 arranged at the four corners of a square.
1.41, . . . are stacked in multiple layers with a steel plate stabilizer 42 having a rectangular shape in plan view sandwiched therebetween, and support the mass body 5 from its lower surface via a steel support member 43. This laminated rubber 41 has a structure in which, for example, steel plates and sheet-like rubber are laminated in multiple layers, and a mounting plate is provided below the laminated rubber, and allows displacement with respect to the load m in the horizontal direction. Displacement with respect to vertical charge is restricted. The scale and number of laminated rubber layers 41, .

Further, the mass body 5 is configured by housing plate-shaped mass members 52, 52, . . . in a box-shaped housing 51. This mass member 52 is made of, for example, steel, lead, concrete, etc., and the ff [ffi of the mass body 5 as a whole is usually 1/150 to 1/1 of the total ff1ffi of the building 2.
The number and material of the sheets are set to be within the range of 600.

Furthermore, the braking device 6 includes limit switches 61, 61 . ..., an air brake 63 protruding from the lower surface of the storage body 51 via a cylinder 62,
The air brake 63 is disposed opposite to the air brake 63 by the operation of the friction plate 64 provided on the upper surface of the mounting plate 3 and the limit switch 61.
and an air supply mechanism (not shown) that supplies compressed air to the air hose 65 through an air hose 65. The air brake 63 also includes an air brake cylinder 6G attached to the cylinder 62, a piston 67 slidably provided in the axial direction of the air brake cylinder 6G, a pressure contact plate 68 provided at the tip of the piston 67, and a lower It is composed of a spring 69 provided inside the cylinder chamber.

The limit switch 61. ... are set to operate when the mass body 5 moves horizontally by a predetermined amount or more. The horizontal displacement of the mass body 5 (hereinafter referred to as control displacement) when the limit switches 61, . For example, when the natural period of the building 2 is 1 second, it is about 30 cm, and when it is 5 seconds, it is about 70 cm. This corresponds to the case where an earthquake with a seismic intensity of V (approximately 80 gal in terms of ground surface acceleration) or more acts on the building 2. Therefore, in a normal state, that is, in an earthquake with a degree of haze of less than ■ (one of the largest earthquakes that occurs once every few years in Tokyo, with a ground surface acceleration of about 80 gal), the pressure contact plate 68 is moved by the elastic force of the spring 69. Since it is spaced apart from the friction plate 64, the gim body 5 is in a horizontally movable state. However, when an earthquake larger than iRV occurs and the mass body 5 moves horizontally by more than the control displacement, the pressure contact plate 68 is moved from the friction plate 64 by the operation of the limit switches 61, .
, and the horizontal movement of the mass body 5 is braked by the frictional force between the pressure plate 68 and the friction plate 64. The pressing force of this pressing plate 68 can be arbitrarily adjusted by the air pressure of compressed air supplied from the air supply mechanism 1.

Further, the buffer body 7 is constituted by a ring-shaped elastic body such as rubber having a hollow rectangular cross section, and is provided on the inner surface of a cylindrical surrounding member 71 that projects from the upper surface of the mounting plate 3.

This shock absorber 7 is provided at a position opposite to the side surface of the cylinder 62 of the braking device 6, and the distance between them is approximately 13 to 2.0 times the control displacement when the mass body 5 is horizontally moved. (Hereinafter, this will be referred to as a limit displacement), and is set at a distance such that the side surface of the cylinder 62 comes into contact with the side surface of the buffer body 7. The shock absorbers 7 are provided in case the brake device 6 fails or an unexpected situation occurs, and since the direction of vibration of the mass body 5 is indefinite, they are installed evenly in all directions.

Next, with reference to FIGS. 1 to 4, the operation of the vibration suppressing device for a structure, which is an embodiment of the present invention, will be described.

When a strong wind acts on the building 2 in which the vibration suppressing device 1 is installed near the rooftop, the mass body 5 starts to vibrate with a half-cycle delay from the building 2. Therefore, as shown in FIG. 4, the horizontal movement directions of the building 2 and the mass body 5 are in opposite phases, so that the vibration of the building 2 is canceled by the vibration of the mass body 5, and as a result,
Vibration of the building 2 is suppressed during strong winds. This operation is continued until an earthquake of approximately seismic intensity II acts on the building 2, and therefore, the present vibration suppressing device 1 also acts as a vibration suppressing device for the J'tlI earthquake.

Next, when the material 5 moves horizontally by more than the control displacement due to an earthquake having a seismic intensity of V or more acting on the material 2, the braking device 6 and switch 61, . . . By supplying compressed air to the air brake 63 by the air supply mechanism that is not
I'm forced to. Therefore, the horizontal movement of the mass body 5 is damped, and vibration of the mass body 5 with excessive amplitude due to an earthquake is suppressed.

Furthermore, if the mass body 5 moves horizontally beyond the limit displacement due to a failure of the braking device 6 or the occurrence of an unexpected situation, the side surface of the cylinder 62 on the lower surface of the cylinder 62 comes into contact with the side surface of the buffer body 7, causing the mass body 5 to reach its limit. Excessive displacement exceeding the displacement can be prevented. In addition, this shock absorber 7 has a hollow elastic body as a component and has elastic spring characteristics, so when the mass body 5 comes into contact with the shock absorber 7, the natural period of the system including the mass body 5 changes. , thereby also having the effect of suppressing the response displacement of the mass body 5.

Vibrations of the building 2 during strong winds can be suppressed by the effects described above. Here, the vibration suppressing device l of this embodiment has a horizontal displacement unit 4 that can horizontally move the mass body 5 from below.
Since the inverted pendulum system supported by 6.4, . Since it is necessary, space can be saved, and it does not include elements that require maintenance such as hydraulics, making it maintenance-free and low cost. This makes it fully applicable to general buildings such as hotels and residences where people live or live all the time.

Furthermore, even if a large earthquake with a seismic intensity of V acts on the building 2, the excessive amplitude of the building 5 can be suppressed by the action of the braking device 6, and even in the event of an emergency, the presence of the buffer 7 In fact, the m-body 5 does not move beyond the limit displacement, and therefore, safety measures in the event of an earthquake are ensured, making this a highly desirable device in Japan, one of the world's most earthquake-prone countries.

Furthermore, the laminated rubber 41,...
・Since horizontal movement of the mass body 5 is performed by shearing deformation of the rubber, it is therefore easier to move the mass body 5 than the conventional hydraulic hydrostatic bearing support system in which the inertial mass m is supported by friction. Another advantage is that there is less noise when the mass body 5 moves horizontally, and that an effective vibration suppression effect can be obtained even with small vibrations such as those caused by wind. In particular, in this embodiment, since the horizontal displacement part 4 is constructed by laminating the laminated rubber 41, etc. in multiple stages, the mass body 5 can be greatly deformed. A vibration suppressing effect can be obtained.

Note that an experiment conducted by the present inventor to confirm the effectiveness of the vibration suppressing device of the present invention will be described below with reference to FIGS. 5 and 6.

Figure 5 shows the effective mass ratio (the mass of the vibration suppressor)
m to the effective weight of the building) is set to 0.01,
This is a comparison of the calculated values of the free vibration waveform of a building when there is no vibration suppression device and when there is a vibration suppression device. As can be seen from this figure, by installing the vibration suppressing device of the present invention, the vibration damping performance of the building is significantly improved, and the vibration of the building is suppressed.

Figure 6 also shows the displacement response magnification (amplitude 1
．． Regarding the response displacement amplitude of the building when a sine wave of 0 is input, there are three cases with and without a vibration suppression device.
This is a comparison of calculated values.

From this figure, it can be seen that the vibration suppression device of the present invention (effective mass ratio 0.0
It can be seen that by installing 1), the response displacement amplitude of the building becomes approximately 115.

In general, increase the effective mass ratio (quality of vibration suppressor m
However, in actual buildings, there is a limit to the size of the mass body, and for practical purposes, the effective mass ratio is used in the range of 0.020 to 0.005. .

Note that the details of the structure vibration suppressing device of the present invention are not limited to the above-mentioned embodiments, and various modifications are possible. −
As an example, as shown in FIG. 7, the deformation absorbing portion 4 is formed into a triangular shape in plan view, and the laminated rubber 42, 42, . . . are arranged so as to be located at the n1 point of the triangle. There may be. In this case, the planar dimensions of the entire vibration suppressing device 1 can be made smaller than in the previous embodiment, which is preferable. In this way, the shapes and the like of the elements constituting the vibration suppressing device 1 are unique and can be changed as appropriate depending on the construction conditions and the like.

"Effects of the Invention" As explained in detail above, according to the present invention, the rubber is disposed at a predetermined position of a structure and is supported from below by multi-layered laminated rubber so that the vibration frequency is the same as the natural vibration period of the structure. The vibration suppressing device for a structure consists of an inertial mass m body and a braking device that suppresses the horizontal movement when the inertial mass m body is horizontally displaced by a predetermined amount or more. Compared to vibration suppression devices that use support, it is possible to save space because no extra space is required around the body, and it does not include elements that require maintenance such as hydraulics, so it is maintenance-free and low-cost. can be achieved. This makes it fully applicable to general buildings such as buildings and houses where people live or live all the time.

Moreover, even if a large external force such as a large earthquake acts on the building, the excessive amplitude of the mass can be suppressed by the action of the braking device, and safety measures in the event of an earthquake are perfect. In particular, if you install a shock absorber, you can use &i! Due to the presence of the impactor, the mass body does not move horizontally beyond the critical displacement,
The aforementioned safety measures in the event of an earthquake will be even more thorough.

[Brief explanation of the drawing]

1 to 4 are diagrams showing a vibration suppressing device for a structure which is an embodiment of the present invention, in which FIG. 1 is a plan view showing a state in which main parts are cut away, and FIG. 2 is the same. A front view showing the main parts cut away, Figure 3 is a schematic front view showing the state installed in a building, Figure 4 is a diagram showing the action of the vibration suppression device, and Figure 5 shows the vibration suppression device. Figure 6 is a diagram showing the free vibration waveform of a building with and without a vibration suppression device. Figure 7 is a diagram showing the displacement response magnification of a building with and without a vibration suppression device.
The figure is a plan view showing another embodiment of the vibration suppressing device of the present invention. 1...Vibration suppression device, 2...Building (
structure), 4...horizontal displacement part, 5...
Inertial mass body, 6...braking device, 7...
buffer body.

Claims (2)

[Claims] (1) An inertial mass body placed at a predetermined position on a structure and supported from below by multi-stage laminated rubber so that the vibration period is the same as the natural vibration period of the structure; A vibration suppression device for a structure comprising a braking device that suppresses horizontal movement at the stage of horizontal displacement. (2) In the vibration suppression device for a structure according to claim 1,
A vibration suppressing device for a structure, characterized in that a shock absorber is attached at a position that comes into contact with the inertial mass body when the inertial mass body is horizontally displaced by a predetermined amount or more.