JPS63114774A - Vibration damping apparatus of building - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Industrial Application Fields This invention is applicable to 1. For example, super high-rise or ultra-high-rise buildings, or buildings whose eaves are not very high but have an elongated shape due to site restrictions, or observation towers and airport control towers. It is installed inside buildings that are prone to long-period shaking, such as tower-like structures such as buildings that are equipped with seismic isolation devices, and creates a different vibration system that resonates with the shaking of the same building to absorb the vibration energy of the building. More specifically, it consists of a mass block of a desired weight, laminated rubber legs that freely support horizontal vibrations, and a damping device, and it can easily be made into a multilayer structure, and can be used for multiple buildings. This invention relates to a vibration damping device for buildings that exerts a damping effect in a multi-degree-of-freedom system with respect to the natural period of the building.

Conventional technology ■ The vibration damping device shown in Fig. m5 was implemented in the Chiba Port Tower, and the Y-direction rail 3 is mounted on the foundation frame 31.
2.32, on which a Y-direction mass block 33 is reciprocatably installed, and a rotary damping device m34 on the base frame 31 is mounted on a Y-direction rack 35 formed on the negative side edge.
(viscous damper) binions 34' are tied together. Also, the X-direction beam /l/36. provided on the Y-direction mass block 33. , 36, an X-direction mass block 37 is installed so as to be reciprocally movable, and an X-direction rack 38 formed on the negative side edge thereof has a binion 39' of a rotary damping device 39 provided on the Y-direction mass block 33. are interlocked.

■ The nine vibration damping devices shown in Figure 6 were announced at the Architectural Institute of Japan in November 1985 as installed on a 120 m tower-supported chimney. A mass block 42 is attached to the upper end of a rod 41 supported by the rod 41. An oil damper 4 is installed in the middle of the rod 41 in two horizontal orthogonal directions (X and Y directions).
3 and springs 44, each other end of which is attached to a reaction post 45 fixed on the floor of the structure.

Problems to be solved by the present invention (1) The vibration damping device is another vibration system that resonates with the shaking of the building, and the more violently the vibration damping device shakes, the more vibration energy of the building is absorbed and the damping effect is exerted. .

However, because the conventional vibration damping device described in (iii) above is a large-scale mechanical mechanism, even if the structure shakes considerably due to wind or earthquakes, the response is slow, it does not vibrate smoothly, and the damping effect is slow. do not have.

However, it is an expensive device in terms of cost.

In addition, since the system has a total of two degrees of freedom, one degree of freedom in each of the horizontal x and Y directions, only IMi-type periodic characteristics can be set in each direction. Absorbing the next vibration energy has a large vibration damping effect, and in the above-mentioned configuration with one degree of freedom in each < However, there is a problem in that the damping effect is low.

Furthermore, fine adjustment of the cycle using a spring is extremely difficult in the field. However, the natural vibration period of a building etc. is set = [
Although it is possible to make calculations with a certain degree of accuracy at this stage,
The actual value is not known until the building is completed, so there is a lot of ambiguity.

Despite the importance of pre-existing conditions, there has been a problem in the past that it has not been possible to deal with them.

(II) Next, although the vibration damping device described in item (2) above has a relatively simple and inexpensive structure, it still
It has a configuration with a total of two degrees of freedom, one degree of freedom in each Y direction, and has the same problem as the vibration damping device (2) above.

Furthermore, in the case of this vibration damping device, the vibration amplitude (displacement amount) of the ¥ti block 42 cannot be made very large, so the amount of vibration energy that can be absorbed is small, making it difficult to apply to large structures. There is also a problem.

Means for Solving the Problems (First Invention) As a means for solving the problems of the above-mentioned prior art, the fijj Shinsoden building of the building according to the present invention is shown in Figures 1 to 1 of one drawing.
As shown in a preferred embodiment in FIG. 4, in a vibration damping device that is installed in a building and constitutes another vibration system that resonates with the shaking of the building to absorb the vibration energy of the building.

A mass block 1 having a desired weight was installed on the floor 1 of a building so that horizontal vibration could be freely caused by laminated rubber legs 2, and a damping VC device 3 was installed between the mass block 1 and the floor 10 of the building.

and the outer position of the mass block 1 and the floor l of the building.
A reaction force post 8 is mounted on the O, and a spring 7 for period fine adjustment is installed between the reaction force post 8 and the mass block 1.

TA-layer rubber legs with a structure that exhibits a specified rigidity and LA-like flexible deformation performance. The mass block l supported by ... quickly reacts to even mild shaking of the building and vibrates violently. Therefore, it has good sensitivity to the shaking of the building, and has an excellent vibration energy absorption effect, that is, a vibration damping effect.

Further, the basic resonance periodic characteristics can be set by the characteristics (rigidity, deformability) of the laminated rubber legs 2, and furthermore, the periodic characteristics can be adjusted in a fairly wide range by setting the strength of the fine adjustment spring 7 at the site. In other words, the completely exposed fine adjustment spring 7 can be replaced very easily, with good workability, and the damping effect can be sufficiently enhanced.

The horizontal kinetic energy due to the vibration of the mass block 1 is consumed and reduced by a damping device 3 using a viscous fluid that utilizes the relative displacement caused by the horizontal motion.

(Second invention) As a means for solving the above problem, a vibration damping device for a building according to the present invention is provided as described above, as preferred embodiments are shown in FIGS. 1 to 4 of the drawings. The entire configuration of the first invention is used as the main part, and it is configured in a multilayer structure. That is, in a vibration damping device that is installed inside a building and constitutes another vibration system that resonates with the shaking of the building and absorbs the vibration energy of the building.

A mass block 1 of a desired weight is installed on the floor 1 of a building by laminated rubber legs 2 . The mass blocks 1 were installed in such a way that horizontal vibration could be freely performed, and the required number of mass blocks 1 were stacked in the same manner to form a multilayer structure.

Then, a damping device 3 is installed between the lowest mass block 1 and the floor 10 of the building, and between the mass blocks 1.1 of each layer, and also outside of each mass block 1, A reaction force post 8 was mounted on the floor 10 of the building, and a spring 7 for fine period adjustment was installed between the reaction force post 8 and each mass block l.

The laminated rubber legs 2 have an alternate layer structure in which rubber sheets and iron plates are alternately arranged and bonded together.

Further, as the damping device 3, one of the horizontal movement plates facing each other with a certain parallel gap is attached to the floor 10 of the building, and the other is attached to the mass block 1, and the horizontal movement plates 3b, 5
This is implemented in a structure in which a gap between the two is filled with a viscous fluid 6.

Furthermore, the uppermost mass block 1' is the ceiling beam 1 of the building.
A configuration having a damping device 3 between the device 1 and the device 1 is also implemented.

Function This second invention also has the same function as the first invention described above, and in particular has a multilayer structure.

The structural disadvantage of the laminated rubber legs 2, which makes it difficult to manufacture ones with a long period, can be improved by increasing the number of layers, and the restrictions on the period can be lifted, making it applicable to buildings with a long period.

Also, if the mass block 1 has two layers, it will constitute a vibration system with two degrees of freedom in each of the X and Y directions of the waterwork, and a total of four degrees of freedom (multiple degrees of freedom depending on the number of layers). , this 4
By matching the vibration period characteristics of the degree of freedom with the first and second period of the building in each of the X and Y directions, the amplitude of the first and second vibrations, which are generally large vibration forces in buildings, can be significantly reduced and controlled. The vibration effect is large.

Example Next, the embodiment shown in the drawings will be explained.

The vibration damping devices shown in Figures 1 and 2 are of the so-called passive damper type.In principle, the more violently the building shakes, the more vibration energy is absorbed by the building, increasing the damping effect. It is installed on the top floor of building A, where the amplitude of shaking is the largest, and is used to constitute another vibration system that resonates with the shaking of building A.

That is, the cylindrical laminated rubber legs 2 are fixed and erected at 4 fl places on the floor 10 of the building, and the desired ff! The horizontal mass block 1 shall have a mass of several percent or less of the effective mass related to the predominant vibration period of the building A, and its material may be, for example, concrete or steel container. The mass block 1 in the illustrated example, which is configured to have a heavy object packed inside, has a square plane, and its four corners are supported by laminated rubber legs 2 of one piece each ( Figure 2).

The laminated rubber leg 2 is an integral part of an upper support plate 2a and a lower support plate 2b, and a plurality of rubber elastic plates and metal plates are alternately laminated in the vertical direction and bonded together (usually by FE bonding). It consists of The upper support plate 2a is fixed to the lower surface of the mass blower 21 by bolts or other means, and the lower support plate 2b is fixed to the floor 10 of the building A by bolts or other means. Since it has a structure in which rubber elastic plates and metal plates are alternately laminated, it safely supports the mass block 1 and exhibits a predetermined rigidity and deformability in the horizontal direction. Therefore, depending on the design, characteristics that match the basic vibration period characteristics of the building can be easily obtained.

Note that although the horizontal cross section of the laminated rubber leg 2 in the illustrated example is circular, it is not limited to this, and may be square, polygonal, or the like.

3 in the figure is a damping device using viscous fluid installed between the mass block I and the floor A of the building.

A support rod 3a is fixed vertically downward to the lower surface of the mass block 1, and a disk-shaped movable resistance plate 5, which is one of the horizontal movement plates, is horizontally attached to the lower end of the support rod 3a. On the other hand, a shallow container 3b is fixed on the floor 10 of the building A in a concentric arrangement with the movable resistance plate 5, and a viscous polymer such as silicone oil, polyisobutylene, polypropylene, or polybutene is placed in the container 3b. A viscous fluid 6 such as dirt or asphalt is contained therein. Between the movable resistance plate 5 and the bottom of the container 3b facing the movable resistance plate 5, a gap of about 1 in parallel in the horizontal direction is secured, and the gap is filled with the viscous fluid 6. In other words, the bottom of the container 3b is used as another horizontally moving plate.

When the mass block 1 horizontally vibrates, the movable resistance plate 5 moves horizontally, causing a mutual displacement between it and the bottom of the container 3b, which in turn creates a viscous shearing resistance force in the viscous fluid 6. It absorbs and dampens vibration energy.

It should be noted that a sliding member is attached to the lower surface of the movable resistance plate 5 to keep the size of the gap constant by sliding in contact with the bottom of the container 3b, and a sliding member is provided to absorb the sinking deformation of the a-layer rubber leg 2. Support JP! It is advantageous to provide a structure in which the viscous shear resistance force of the viscous fluid 6 is always maintained at a constant level by providing it in the viscous fluid 6.

Next, a reaction force post 8 is fixed and erected on the floor 10 of the building A at positions in four right angle directions outside the mass block 1, and the reaction force post 8 and the spring of the lniblock 1 are fixed and erected. A coil spring 7 is attached between the receiver and the angle 9 for fine adjustment of the vibration period. When the spring constant of the coil spring 7 is large, the vibration period of the mass block 1 becomes short, and conversely, when the spring constant is small, it becomes long.

In other words, by selecting and replacing the spring constant of the coil spring 7,
This allows fine adjustment of the vibration period. Or horizontal X,
The difference in the vibration period in the Y2 direction can also be easily finely adjusted.

By the way, in the case of the vibration damping device shown in FIG. 1, laminated rubber legs 2 are also attached on top of the mass block 1, and this allows the second mass block 1' to be supported horizontally so that horizontal vibrations can freely occur. It has a two-layer laminated structure. And the first
A damping device'1 is installed between the mass block 1.1' of the first stage and the second stage.
13 installed, 1 anti-kabost 8 and fiffi block 1'
A coil spring 7 for adjusting the periodic machine rA is installed between the spring holder and the angle 9. In other words, it is constructed into a heavy structure by stacking the same structure over and over again. Therefore, if necessary, the building can be configured to have a multi-layered structure as long as the floor height of the building A allows.

Therefore, in the case of a two-stage laminated structure as described above, there are two degrees of freedom in each of the horizontal X and Y directions, thus constructing a vibration system with a total of four degrees of freedom. Therefore, by appropriately designing a combination of three characteristics: 1affi of the mass block 1.1', the rigidity and deformation performance of the laminated rubber leg 2, and the strength of the coil spring 7, the vibration periodic characteristics of the four degrees of freedom can be adjusted. It is possible to almost match the primary period and secondary period of building A in each of the horizontal X and Y directions. In this way, the amplitude of the primary and secondary vibrations, which are generally large as the vibration force of the building A, can be considerably reduced, resulting in an excellent vibration damping effect.

However, the specific amount of vibration amplitude reduction is determined by the ability of the damping device 3.

Second Embodiment The vibration damping device shown in FIG. 4 is characterized by a structure in which a damping device 3 is installed between an upper mass block 1' and a beam 11 on the upper floor. As the number of damping devices 3 increases, the healing force for reducing vibration amplitude increases.

In the figure, 4 is a member with a height of 1 g and 1 m that facilitates the connection between the beam 11 on the upper floor and the damping device 3.

The effects of the present invention are as described in detail in conjunction with the embodiments, and the building vibration damping device according to the present invention has a linear overall structure and smooth movement, so it can withstand the shaking of building A. It reacts sensitively and operates with excellent vibration damping effect.

Furthermore, since the structure is simple, construction and maintenance are easy and inexpensive.

Next, in the case of the vibration damping device of the present invention, the vibration period can be easily finely adjusted by adjusting the strength of the coil spring 7, and it is easy to make adjustments at present, so that the actual natural vibration period of the completed building A can be easily adjusted. It is easy to ensure matching characteristics, and an excellent vibration damping effect on the natural period can be exhibited.

Moreover, a vibration damping device configured with a multilayer structure constitutes a vibration system with multiple degrees of freedom in proportion to the number of layers.

It is possible to increase the vibration damping effect by targeting multiple dominant natural vibration periods of building A.

In addition, the multi-layer vibration damping device can compensate for the disadvantages of the small laminated rubber legs 2 and have a large amount of deformation, and can be applied to large structures with long periods. Wide range of application.

[Brief explanation of the drawing]

Figures 1 and 2 are a front view and a sectional view taken along the arrows -■, showing a first embodiment of the vibration damping VC device of the present invention, Figure 3 is an elevation view when applied to a building, and Figure 4 The figure is a front view of the second embodiment.
This figure and FIG. 6 are perspective views showing a conventional vibration damping device. Figure 1 Figure 10 Figure 2 Figure 3 Figure 5 Figure 6

Claims (1)

[Scope of Claims] [1] In a vibration damping device that is installed in a building and constitutes another vibration system that resonates with the shaking of the building and absorbs the vibration energy of the building, a desired weight is placed on the floor (10) of the building. A mass block (1) is installed with laminated rubber legs (2) to allow free horizontal vibration, and a damping device (3) is installed between the mass block (1) and the building floor (10). A reaction force post (8) is placed on the floor (10) of the building at a location outside the mass block (1).
), and attach the reaction force post (8) and mass block (1).
A vibration damping device for a building, characterized in that a spring (7) for fine period adjustment is installed between the . [2] In a vibration damping device that is installed in a building and constitutes another vibration system that resonates with the shaking of the building and absorbs the vibration energy of the building, a mass block (1) of a desired weight is placed on the floor (10) of the building. The laminated rubber legs (2)... are installed to freely allow horizontal vibration, and the mass block (1) is also installed on top of the mass block (1) to allow horizontal vibration to be freely caused by the laminated rubber legs (2)... Then, in the same manner, a required number of mass blocks (1) are stacked to form a heavy structure, and the mass blocks (1) (
1), a damping device (3) is installed between the mass blocks (1), and a reaction force post (8) is installed on the floor (10) of the building at an outer position of each mass block (1). A vibration damping device for a building, characterized in that a spring (7) for fine period adjustment is installed between (8) and each mass block (1). [3] Laminated rubber legs (2
) is a building vibration damping device characterized by an alternating layer structure made of rubber sheets and steel plates arranged alternately and bonded together. [4] Attenuation device (3) according to claim 2
One side (3b) of the horizontal movement plates facing each other with a certain parallel gap is attached to the floor (10) of the building, and the other side (5) is attached to the mass block (1).
b) A vibration damping device for a building, characterized in that the gap in (5) is filled with a viscous fluid (6). [5] A building characterized in that the uppermost mass block (1) described in claim 2 has a damping device (3) between it and a ceiling beam (11) of the building. vibration damping device.