JPH09302987A - Damped structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To deregulate restrictions on the installation of a dynamic damper added to a structure and to display the effect of vibration control to the vibration over secondary vibration mode. SOLUTION: A slab 31 in an optional layer is insulated from column/beam or frame of column/beam/wall and is installed on the beam 2 or capital, and while bearing vertical load of the slab 31, the slab 31 is mounted on an elastic bearing 4 allowing relative horizontal displacement for the beam 2 of the slab 31 or on an elasto-plastic bearing to use the slab 31 as additional mass of a dynamic damper, and the slab 31 is vibrated to the frame at the same time as the vibration of the structure. If necessary, a vibration energy absorption damper 6 is installed between the slab 31 and beam 2 or between capitals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping structure having a function of suppressing vibration in a dynamic vibration absorber system.

[0002]

2. Description of the Related Art A mass added to a structure is resonated when the structure vibrates due to a strong wind or an earthquake, and is converted into kinetic energy of the added mass for consumption. Dynamic dampers, such as dynamic dampers and tuned mass dampers (damping devices) that absorb the vibration energy input to, are installed separately on the structure to be damped because the added mass is added to the weight of the structure. Since it has a shape that makes it difficult to install in any layer, it is always restricted in installation. Installation costs are also added to the building cost.

The vibration damping device is usually installed on the top of the structure due to difficulty in securing an installation space and the form of the primary vibration mode, but a super high-rise building or tower in which a vibration mode of the secondary or higher is also outstanding. Since it is also effective to install in a specific intermediate layer for a structural object, etc., even if installed only on the top, the effect of damping may be small.

The present invention proposes a damping structure having a function of solving the problem of the dynamic vibration absorber added to the structure from the above background.

[0005]

In the present invention, a slab of an arbitrary layer of a structure of columns / beams or a structure of columns / beams / walls and slabs is used as an additional mass of a dynamic vibration absorber. Eliminates the need to install a dynamic vibration absorber separately,
The degree of freedom in installation as an additional mass in the structure is increased, and the damping effect is effectively exerted on the structure in any vibration mode.

The slab as an additional mass is insulated from the above-mentioned column / beam frame structure or column / beam / wall frame structure, and the vertical load of the slab is placed on the beam directly below the insulated slab or on the capital of the column head. Elastic bearings or elasto-plastic bearings that allow relative horizontal displacement of the slab with respect to the beam are installed.

The slab insulated from the frame is placed on an elastic bearing or an elasto-plastic bearing, and the elastic bearing or the elasto-plastic bearing allows the relative horizontal displacement of the slab with respect to the beam while bearing the vertical load of the slab. , Vibrate the slab independently of the frame.

If necessary, between the slab insulated from the frame and the beam directly below it, or between the capitals, a vibration energy absorbing damper for damping the vibration of the slab vibrated with respect to the frame is installed. It

The frequency of the slab including the elastic bearing or the elasto-plastic bearing is set so as to resonate with the vibration of the structure, and the slab vibrates with respect to the frame simultaneously with the vibration of the structure, and the kinetic energy of the structure causes the structure to vibrate. The vibration energy input to is consumed, and the vibration of the structure is reduced.

The elastic bearing or the elasto-plastic bearing supports the slab insulated from the frame, and horizontally deforms as a spring bearing to vibrate the slab. In particular, the elasto-plastic bearing has the ability to absorb hysteresis energy during horizontal deformation, so it independently acts to damp the vibration of the slab itself, but in addition to the elasto-plastic bearing, it is insulated when a vibration energy absorbing damper is installed. The vibration damping effect of the slab is enhanced.

Since the slab as the additional mass is a part of the structure, the additional mass does not add the cost to the skeleton cost, and the cost can be reduced as compared with the case where an equivalent dynamic vibration absorber is installed. Planned.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The vibration control structure of the present invention is a structure composed of a column 1 and a beam 2, or a structure in which a wall is connected to the structure and a slab 3, and a slab of any layer. The slab 31 is used as an additional mass by insulating it from the pillar 1 and the beam 2 or the frame connected to the wall.
By vibrating the frame with respect to the frame, the vibration energy input to the structure is consumed.

The slab 3 includes a floor slab and a roof slab,
Frame-insulated slab used as additional mass
31 is on the beam 2 as shown in FIGS.
As shown in FIG. 4, it is placed on an elastic bearing 4, which is partially installed on a capital 5 formed around the stigma, or an elasto-plastic bearing, and vibrates with respect to the frame when the structure vibrates.

1 to 4, the slab insulated from the frame
31 shows the embodiment of the invention of claim 2 in which the vibration energy absorption damper 6 is installed between the beam 2 or the capital 5 immediately below it, but it is not always necessary when the slab 31 is supported by an elastic-plastic bearing. It is not necessary to install the vibration energy absorption damper 6. The vibration energy absorption damper 6 is mainly a slab.
Used together when 31 is supported by the elastic bearing 4. The vibration energy absorption damper 6 includes an elasto-plastic damper, a viscous damper, etc.
A damper that generates a damping force according to the swing of the slab 31 is used.

As shown in FIG. 2, the slab 31 serving as an additional mass is used as a single plate as a whole, and as shown in FIG. 4, it is divided into regions divided by columns 1 and beams 2. Is used. In either case, a clearance is secured between the periphery of the slab 31 and the pillar 1 in the plane. If there is a wall, a clearance is also secured between it and the wall. FIG. 4 shows that the slab 31 (floor slab) in two areas of the one-layer area divided into four by the pillar 1 and the beam 2 is used as an additional mass, and the remaining two slabs (floor slab) are integrated with the beam 2. This is the case when converted.

The elastic bearing 4, or the elastic-plastic bearing is a slab 31.
The slab 31 is vibrated in an arbitrary horizontal direction with respect to the beam 2 while bearing the vertical load. Since the elasto-plastic bearing itself has a damping performance and acts as a damper, it suppresses an increase in the shaking of the slab 31 that has caused vibration to the frame. In some cases, the vibration energy absorbing damper 6 may be installed below the slab 31 instead of or together with the elasto-plastic bearing.

FIG. 1 shows a slab 31 on the upper and middle floors of the structure.
The case where (floor slab) is used as the additional mass is shown below.
The layer of the slab 31 used as the additional mass depends on the vibration characteristics of the structure. Especially when the structure is thin and has a high shape and a high-order vibration mode is excited, it is effective to use the intermediate slab 31 as the additional mass.

[0018]

The structure slab is used as the additional mass of the dynamic vibration absorber, and the elastic or elastic-plastic bearing that allows relative horizontal displacement of the slab with respect to the beam is supported while bearing the vertical load of the slab. The slab vibrates the structure of columns / beams or the structure of columns / beams / walls at the same time as the structure vibrates, so there is no need to add a separate dynamic vibration absorber, and the slab of any layer can be added. As a result, the degree of freedom in installation as an additional mass is increased, and the vibration of the structure can be effectively suppressed with respect to the structure of any vibration mode.

Since the slab that is the additional mass is a part of the structure, the cost is not added to the skeleton cost by using the additional mass, and the cost can be reduced as compared with the case where an equivalent dynamic vibration absorber is installed. Planned.

According to the second aspect of the present invention, the vibration damping effect of the insulated slab is enhanced by using the vibration energy absorbing damper in addition to the elastic-plastic bearing.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a relationship between a frame structure of columns / beams and a slab used as an additional mass.

FIG. 2 is a plan view of FIG. 1 showing a case where a slab having an additional mass is placed on an elastic bearing installed on a beam.

FIG. 3 is a plan view of FIG. 1 showing a case where a slab serving as an additional mass is placed on an elastic bearing installed on a capital.

FIG. 4 is a plan view showing a modified example of FIG.

[Explanation of symbols]

1 ... Pillar, 2 ... Beam, 3 ... Slab, 31 ... Slab with additional mass, 4 ... Elastic support, 5 ... Capital, 6 ...
… Vibration energy absorption damper.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takashi Nagasaki, Takashi Nagasaki, 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Ryoji Sugawara, Egasaki-cho, Tsurumi-ku, Yokohama-shi, Kanagawa 4-1 In the TEPCO Atomic Energy Research Institute (72) Inventor Naoshi Matsumoto 4-1, Egasaki-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Inside TEPCO Atomic Energy Research Institute (72) Inventor Miki Ogiwara Yokohama-shi, Kanagawa 4-1, Egasaki-cho, Tsurumi-ku, Atomic Energy Research Institute, Tokyo Electric Power Company

Claims (2)

[Claims] 1. A column / beam frame or a structure composed of a column / beam / wall frame and a slab, wherein a slab of any layer is insulated from the frame, and is directly above the insulated slab. Or, an elastic bearing or an elasto-plastic bearing that allows relative horizontal displacement of the slab with respect to the beam is installed on the capital of the column head while bearing the vertical load of the slab, and the slab insulated from the frame is an elastic bearing, or A vibration-damping structure that is placed on an elasto-plastic bearing and consumes the vibration energy input to the structure as the slab vibrates against the frame simultaneously with the vibration of the structure. 2. The vibration damping structure according to claim 1, wherein a vibration energy absorbing damper is installed between the slab insulated from the frame and the beam or the capital directly below the slab.