JPH052075B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vibration damping device that provides a frame with the ability to absorb energy during an earthquake or the like.

[Problem to be solved by the invention]

In order to suppress the shaking of high-rise buildings during earthquakes and strong winds, damping devices and elastic materials are used that absorb vibration energy by transmitting vibration to a viscoelastic body and converting it into thermal energy, or by using its own plastic deformation force. Various plastic dampers have been proposed so far.

As an example, as shown in Japanese Utility Model Application Publication No. 1-61363, there is a structure in which an inner column is located within two outer columns protruding from a beam, and a viscoelastic body is interposed between them.

This invention improves the structure of the above-mentioned publication to restrict movement of the outer column in the out-of-plane direction.

[Means to solve the problem]

This invention is a device that is installed vertically between the centers of the steel beams on the upper and lower floors to absorb the vibration energy of the building. A connecting fitting that includes two outer columns that are connected to a beam steel frame and separated from the one beam steel frame and placed on both sides of an inner column, and that the flanges on both sides of the outer column pass through the web of the inner column. to restrain the movement of the outer column in the out-of-plane direction,
This is a vibration damping device in which a viscoelastic body is interposed between both surfaces of the inner column and the inner surface of the outer column so that both sides can be relatively movable in the in-plane direction.

〔Example〕

The present invention will be explained below based on the drawings showing one embodiment.

As shown in Fig. 1, the vibration damping device A of this invention is installed vertically between the central parts of the steel beams B, B on the upper and lower floors, and is made of viscoelastic material bonded between the inner column 1 and the outer column 2, 2. 3 to absorb vibrational energy.

The inner column 1 is vertically joined to one steel beam B, and the other steel beam B is separated. In the illustrated embodiment, the inner column 1 is inserted between two plates 4, 4 protruding from the flange of the beam steel frame B on the lower floor side, as shown in FIG. 2, and bolted thereto.

The outer columns 2, 2 are joined to the other beam steel frame B and separated from the one beam steel frame B.

The outer columns 2, 2 are arranged on both sides of the inner column 1 as shown, and are fixed thereto, for example, by bolting a welded plate 4 to the flange of the beam steel B.

Further, the inner and outer columns 1 and 2 have flanges 1a and 2a, respectively, which protrude in the out-of-plane direction from both side edges, thereby increasing the rigidity of the inner and outer columns 1 and 2 in the out-of-plane direction.

As shown in FIGS. 2 and 3, the viscoelastic body 3 is bonded between both surfaces of the inner column 1 and the inner surfaces of the outer columns 2, 2 so that the columns 1, 2 are relatively movable in the in-plane direction. Ru.

In order to prevent the viscoelastic body 3 from peeling off when a force is applied in an out-of-plane direction, in this embodiment, as shown in FIG. They are connected by a U-shaped connecting fitting 5, for example, a U-shaped bolt, and their movement in the out-of-plane direction is restrained. In this case, the bolt hole 1c of the web 1b is opened in the shape of an elongated hole.

〔Effect of the invention〕

This invention is as described above, and since the columns connected to the center of the beams on the upper and lower floors are connected to each other by a viscoelastic body or an elastoplastic damper having energy absorption ability, rotational deformation of the beams is prevented. The angle can be effectively reduced and the damping ability of the frame can be increased.

In particular, the flanges on both sides of the outer column are connected to each other with connecting fittings that pass through the web of the inner wall, thereby restraining the movement of the outer column in both outward directions, allowing the viscoelastic body to act effectively, and also in the out-of-plane direction of the inner and outer columns. The rigidity of the material can be increased.

Furthermore, since this device is installed in the center of the frame, openings can be provided relatively freely.

[Brief explanation of the drawing]

FIG. 1 is an elevational view showing an embodiment of the present invention, and FIGS. 2 and 3 are a longitudinal sectional view and a transverse sectional view, respectively. A... Vibration control device, 1... Inner column, 1a... Flange, 1b... Web, 1c... Bolt hole, 2...
Outer pillar, 2a... flange, 3... viscoelastic body, 4...
...Plate, 5...Connection fittings, B...Beam steel frame.

Claims (1)

[Claims] 1. A device that is installed vertically between the centers of the steel beams on the upper and lower floors to absorb the vibration energy of the building.
An inner column is connected to one beam steel frame and separated from the other beam steel frame, and two outer columns are connected to the other beam steel frame and separated from said one beam steel frame and placed on both sides of the inner column. The flanges on both sides of the outer column are connected to each other by connecting fittings that pass through the web of the inner column to restrain movement of the outer column in the out-of-plane direction. A vibration damping device that includes a viscoelastic body that is movably bonded in an in-plane direction.