JPH102125A - Beam damper construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a beam damper capable of freely making a construction plan without requiring any frame surface, being constructed of members having lower strength and lower damping coefficient and being also applied to the existing building. SOLUTION: The beam damper construction is so constituted that an upper chord 5 and a lower chord 6 are provided between columns 1 not being connected to each other with beams 2 and that a damper 9 is held between the upper chord 5 and lower chord 6. Then, an elastoplastic damper can be used as the damper 9 mounted between the upper chord 5 and lower chord 6, and lattice bars incorporating an oil damper between the upper chord 5 and lower chord 6 are molded in the shape of a lattice.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a beam damper structure installed for reducing vibration of a building structure.

[0002]

2. Description of the Related Art When a damping device is installed in a building structure for the purpose of reducing vibrations, a seismic element such as a brace is incorporated in the building surface, and the damping device is attached. Was customary.

FIG. 9 shows a brace 8 in a beam-column frame 10.
FIG. 2 is a diagram of a structure in which a honeycomb-shaped elasto-plastic damper 9 is attached to the head thereof to aim at hysteresis attenuation. An oil damper can be used instead of the elasto-plastic damper, and a structure using both of them has been developed. (For example, Japanese Patent Application No. 7-179909) In any case, the conventional structure for adding damping has the following problems.

[0004] A frame surface, such as a brace or an earthquake-resistant wall, to which a damping device is attached is always required.

[0005] Therefore, the space of the building structure is partitioned on the frame side, so that there are restrictions on the building plan. Also, installation on existing building structures is not always possible.

[0006] Even if seismic elements such as braces are provided on the column-beam frame surface and a damping device is attached, if the plane surface of the frame surface with the damping device is not properly arranged, the building structure is subjected to torsional vibration. May be excited.

The present invention solves the above-mentioned problems and can be applied to existing building structures without impairing the degree of freedom of a building plan, and furthermore, a beam completely free from torsional deformation. It is an object to provide a damper structure.

[0008]

A beam damper structure characterized in that an upper chord material and a lower chord material are provided between columns that are not connected to each other by beams, and a damping device is sandwiched between the upper chord material and the lower chord material. The damping device is an elasto-plastic damper that causes a yield deformation by a shear force generated in the beam damper structure, or an oil damper that generates a damping force proportional to the relative speed between the upper chord material and the lower chord material. The structure absorbs the vibration energy of the building.

Next, the operation will be described.

FIG. 2A shows a situation in which a horizontal load acts on a vertically standing building structure. The building structure is placed horizontally, and the entire building structure is macroscopically and horizontally uniformed by its own weight. It is a diagram when it is regarded as a cantilever receiving a load,
(B) is a cross-sectional view. The frame constituted by the columns 1 and the beams 2 undergoes bending deformation and shear deformation. In this case, the bending stiffness of the building structure is extremely large compared to the shear stiffness, and is usually modeled as a structure having an excellent shear deformation. If this is mathematically considered, it is considered that the rigidity synthesized as a whole by connecting two springs (bending rigidity and shear rigidity) in series is almost determined by the shear rigidity. FIG. 3 is a diagram showing a mathematical model of the overall rigidity of the frame constituted by the columns 1 and the beams 2.

[0011] Construction of the entire bending stiffness K _B building total shear stiffness K _S total combined stiffness K _H is expressed by _{K H = 1 / (1 /} K B + 1 / K S). On the other hand, FIG.
In the same manner as above, the situation in which a horizontal load acts on a vertically standing building structure is described in the following. (B) is a diagram in which a diagonal beam is provided and a damper beam incorporating a damping device is provided in the beam, as shown by a thick solid line.

In the case of FIG. 4, similarly to the case of FIG. 2, the cross-sectional area of the building structure does not change, and since the oblique beam does not penetrate in the axial direction of the building structure, the second moment of area does not change. and therefore it does not change the bending stiffness K _B of a building structure.

On the other hand, the shear stiffness has the effect of adding the shear stiffness of a damper beam in parallel to a basic frame composed of columns and beams. FIG. 5 is a diagram illustrating a mathematical model of the overall rigidity when a beam damper structure is added to a frame constituted by columns 1 and beams 2.

Therefore, the shear rigidity K _S1 of the basic frame composed of columns and beams, and the combined rigidity K _H of the entire frame rigid rigidity K _{S2 of the} frame composed of columns and damper beams are: K _H = 1 / [1/1 / K _B + (1 / (K _S1 + K _S2 )].

As described above, a part of the horizontal shear force at the time of the earthquake is borne by the frame to which the damper beam 3 is connected.

Similar to the structure already described, the basic frame composed of the column 1 and the beam 2 and the damper beam 3 also has a large bending rigidity, so that the horizontal rigidity of the entire frame depends on the shear rigidity.

FIG. 1A is a beam plan view of a building structure provided with oblique damper beams 3, and FIG. 1B is a frame diagram.
(B) The figure shows between columns 1 that are not connected to each other by beams 2
This is an example of a damper beam 3 in which an upper chord material 5 and a lower chord material 6 are provided, a damping device 9 is attached to a lattice bar, and a lattice is assembled by the upper chord material 5 and the lower chord material 6.

A damping device (for example, an elasto-plastic damper, an oil damper, etc.) provided on the damper beam only exerts a damping force proportional to the speed and does not act on a static load such as a vertical force.

Therefore, the damper beam 3 does not bear the vertical static load, and the vertical static load is borne only by the basic frame of the column 1 and the beam 2. The damping device 9 of the damper beam 3 plays a role of absorbing horizontal vibration energy of the building structure.

Therefore, for example, the basic frame of the column 1 and the beam 2 bears about 70% of the total horizontal shear force of the basic frame and the damper beam frame, and the remaining about 30% of the horizontal shear force is applied to the damper beam. To bear. In the case of a damper beam using an elasto-plastic damper, the damper beam may be yielded prior to other structural members. Therefore, the design horizontal shear force of the basic frame may be small. Similar results are obtained by using an oil damper instead of the elasto-plastic damper.

[0021]

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

FIG. 1A is a plan view of a building having a damper beam structure. A damper beam 3 is provided in a basic frame structure composed of columns 1 and beams 2. (B) is an AA view of the damper beam structure. In the example of this figure, the damper beam 3 is composed of an upper chord material 5 and a lower chord material 6, and a damping device 9
Lattice bars are assembled in a lattice shape.

Therefore, unlike the case of the brace or the earthquake-resistant wall, it is not necessary to partition the space, the flexibility of the architectural plan is not impaired, and the present invention can be applied to an existing building structure.

FIG. 2A shows a situation in which a horizontal load is applied to a vertically standing building structure. The building structure is placed horizontally, and the entire building structure is horizontally and horizontally uniformed by its own weight. It is a diagram when it is regarded as a cantilever receiving a load,
(B) is a cross-sectional view.

FIG. 3 is a diagram showing a mathematical model of the overall rigidity of a frame composed of columns and beams.

FIG. 4 (a) shows a situation in which a horizontal load acts on a vertically standing building structure, as in FIG. 2 (a).
The building structure is placed horizontally, and the entire building structure is macroscopically regarded as a cantilever that receives a horizontal uniform load due to its own weight. (B) As shown by a thick solid line, FIG. 5 is a diagram in which a diagonal beam is provided, and a damper beam 3 in which a damping device is incorporated in the beam is provided.

FIG. 5 shows a frame composed of columns and beams,
It is a figure showing the mathematical model of the whole rigidity at the time of adding a damper beam structural surface.

FIG. 6 shows a specific example of the damper beam 3, which is formed by attaching an elastic-plastic damper 4 between the upper chord member 5 and the lower chord member 6 of the damper beam 3. As shown in FIG. (A) is an elevation view and (b) is a top view.

If the yield level of the elasto-plastic damper 4 is set lower than that of the other structural members, a horizontal shear force greater than the shear force of the elasto-plastic damper 4 acts on the basic frame of the column. Never. For example, a damper column frame bears about 30% of the designed horizontal shear, with the remaining 70%
Is designed to be borne by the basic frame. The design may be such that the elasto-plastic damper yields prior to other structural members with the horizontal shearing force borne by the damper column frame.

FIG. 7A is a detailed view of a portion B in FIG. 6A, and FIG. 7B is a CC view thereof.

FIG. 8 (a) shows that instead of the elastic-plastic damper,
FIG. 6 is a diagram in which an oil damper 7 is applied to a lattice bar to form a lattice with an upper chord material 5 and a lower chord material 6.

FIG. 2B is a DD view thereof. In this case, the same effect as described above can be obtained.

[0033]

The effects of the present invention are as follows.

Compared with a conventional damping device installed in a brace, there is no restriction on a construction plan, and the applicable range is extremely wide.

Conventionally, a damping device arranged in one place requires a member having a high proof stress and a high damping coefficient. However, a beam damper structure requires a large number of members having a low proof stress and a low damping coefficient. Becomes For this reason, since a large amount of low-price damping members can be used, the cost can be reduced as compared with a conventional damping material.

Since there is no restriction on the architectural plan and the damper beam is irrelevant to the normal load, the seismic resistance of the existing building structure is compared with the method in which the conventional damping device is installed in the column-beam frame. It is also effective as a reinforcement method.

[Brief description of the drawings]

FIG. 1A is a top view of a building structure provided with a damper beam structural surface. (B) is an AA view of the damper beam structure.

FIG. 2 (a) shows a situation in which a horizontal load acts on a vertically standing building structure. The building structure is placed horizontally, and the entire building structure is horizontally and uniformly loaded by its own weight macroscopically. It is a figure when it is considered as a cantilever which receives, and (b) is a cross-sectional view.

FIG. 3 is a diagram showing a mathematical model of the overall rigidity of a frame composed of columns and beams.

FIG. 4 (a) shows a situation where a horizontal load acts on a vertically standing building structure, as in FIG. 2 (a); FIG. 3B is a diagram showing a cantilever beam that receives a horizontal uniform load due to its own weight macroscopically. FIG. 4B shows a damper in which a diagonal beam is provided and a damping device is incorporated in the beam as shown by a thick solid line. FIG. 3 is a diagram in which beams 3 are provided.

FIG. 5 is a diagram showing a mathematical model of the overall rigidity when a damper beam structure is added to a frame composed of columns and beams.

FIG. 6 is a specific example of the damper beam 3;
FIG. 5 is a diagram showing an elasto-plastic damper 4 attached between an upper chord member 5 and a lower chord member 6. (A) is a beam plan, and (b) is a frame diagram.

FIG. 7A is a detailed view of a part B in FIG. 6A, and FIG. 7B is a CC view thereof.

FIG. 8A is a diagram in which an oil damper 7 is applied to a lattice bar instead of an elastic-plastic damper to form a lattice with an upper chord member 5 and a lower chord member 6;

FIG. 9 is a diagram showing a structure in which a brace 8 is provided in a column-beam frame surface 10 and an elasto-plastic damper such as a honeycomb damper serving as a damping device 9 is attached to the head thereof to reduce hysteresis.

[Explanation of symbols]

1 ... pillar, 2 ... beam, 3 ... damper beam, 4 ...
Elasto-plastic damper, 5 ... upper chord, 6 ... lower chord, 7
..Oil dampers, 8 brace, 9 damping device, 10 beam-to-column frame

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Koji Ishii, Inventor 2-19-1, Tobita-Shi, Chofu-shi, Tokyo Kashima Construction Co., Ltd. (72) Kazuhide Yoshikawa 1-2-1, Moto-Akasaka, Minato-ku, Tokyo 7 Kashima Construction Co., Ltd. (72) Inventor Akihiro Kondo Kashima Construction Co., Ltd. 1-2-7 Moto-Akasaka, Minato-ku, Tokyo

Claims (3)

[Claims] 1. A beam damper structure comprising: an upper chord material and a lower chord material provided between columns that are not connected to each other by beams; and a damping device is sandwiched between the upper chord material and the lower chord material. 2. The beam damper structure according to claim 1, wherein an elastic-plastic damper is attached between the upper chord material and the lower chord material. 3. The beam damper structure according to claim 1, wherein a lattice bar incorporating an oil damper is formed in a lattice shape between the upper chord material and the lower chord material.