JPH11303452A - Construction of vibration isolation corresponding to rocking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit quakes in the horizontal and vertical directions of a construction due to external force simultaneously by interposing a spring supporting mechanism between a construction body and a base section while a gyro vibration damper is installed to the lowermost layer of the construction. SOLUTION: Spring supporting mechanisms 3 are interposed between a construction 1 body and a base section 2, and a gyro vibration damper 4 is mounted on a supporting base 5 fixed to the lowermost layer of the construction 1. Seismic force works to the construction 1, to which the vibration isolation devices 3 are interposed, and the horizontally deformed state at the time of excess over a rocking motion is indicated in the X direction. Accordingly, when rotational deformation θ is generated, precession is conducted in the direction crossed at right angles with a shaft 8 in a body of revolution 9 rotated at high speed by the gyro vibration damper 4 on the lowermost floor of the construction 1, moment M resisting rotation is generated by the rocking motion of the construction 1. Since the moment M represents damping force in the opposite direction to the rotational deformation θ of the construction 1, the rotational deformation θ of the construction 1 is offset and erased. Consequently, the rocking motion can also be inhibited.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation structure.

[0002]

2. Description of the Related Art There are already known seismic isolation technologies in which a seismic isolation device is installed at the base of a structure to suppress horizontal vibration.

[0003]

Although the above-mentioned prior art is effective for the horizontal shaking of a structure during an earthquake, it is currently impossible to suppress the vertical vibration due to the rocking motion of the structure. Is difficult. In particular, the case where the rocking motion occurs secondarily in a structure having a large aspect ratio has not been solved.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a rocking seismic isolation structure capable of simultaneously suppressing horizontal and vertical vibrations of a structure due to an external force. To provide things.

[0005]

To achieve the above object, a rocking-compatible seismic isolation structure according to the present invention has a spring support mechanism interposed between a structure body and a base.
A gyro vibration control device is provided on the lowest floor of the structure.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. <B> Spring support mechanism 3 The spring support mechanism 3 is an elastic bearing body such as a rubber bearing, a coil bearing, a hard rubber, a laminated rubber or the like, and is interposed between the main body of the structure 1 and the base 2. It is a member that supports the weight of the structure 1 body.

<B> Gyro Vibration Control Device 4 The gyro vibration control device 4 is mounted on a support base 5 fixed to the lowest floor of the structure 1. For this purpose, the beams 6, 6 rotatable around the axis connecting the support bases 5 are horizontally supported, and on the vertical center line Z of the frame 7 attached to the beams 6, 6,
The rotation shaft 8 is rotatably supported. The direction passing through the support base 5 around the rotation axis 8 of the rotating body 9 is the X axis, and the direction orthogonal thereto is the Y axis (not shown). Frame 7
In this configuration, a disk-shaped rotating body 9 disposed inside the rotating body 9 is attached to the rotating shaft 8, and the rotating body 9 rotates at a high speed when seismic force acts. The required number of the vibration damping devices 4 is set according to the scale and height of the structure 1.

<C> Seismic isolation structure capable of rocking A plurality of soft support mechanisms 3 such as rubber bearings, for example, a plurality of seismic isolation devices such as laminated rubber are interposed between the main body 1 and the base 2. The gyro vibration control device 4 is provided on the lowest floor of the structure 1.

<D> Action The broken line in the figure is a displacement diagram due to the rocking motion of the structure 1, and the seismic force acts on the structure 1 with the seismic isolation device 3 interposed.
The horizontal deformation state when the rocking motion is dominant is shown in the X direction, and this is the case where the rotational deformation θ is caused thereby. At that time, the gyro damping device 4 on the lowest floor of the structure 1 causes the rotating body 9 rotating at a high speed to precess in a direction orthogonal to the rotation axis 8 to prevent the structure 1 from rotating due to the rocking motion. Moment M occurs. This moment M is a vibration damping force in the direction opposite to the rotational deformation θ of the structure 1 (in the direction of the arrow in the drawing), and the rotational deformation θ of the structure 1 is canceled out. Therefore, the locking movement of the structure 1 can be suppressed.

By installing the gyro damping device 4 corresponding to the rocking motion of the structure 1 on the lowest floor, a large damping force can be obtained with a small power.

The gyro damping device 4 is optimally installed on the lowest floor of a structure having a large aspect ratio.

[0012]

Since the present invention has been described above,
The following effects can be obtained. A spring support mechanism is interposed between the structure body and the base, and a gyro vibration control device is provided on the lowest floor of the structure, thereby suppressing horizontal vibration of the structure and generating secondary vibration. In response to the rocking motion, the rotating body of the gyro vibration control device precesses in a direction perpendicular to the rotation axis, thereby generating a vibration damping force against the rotation caused by the rocking motion of the structure. Since the rotational deformation is canceled out, the rocking motion can also be suppressed.

[Brief description of the drawings]

FIG. 1 is a vertical side view of a rocking-compatible seismic isolation structure according to the present invention.

Claims (1)

[Claims] 1. A seismic isolation system for rocking, wherein a soft spring support mechanism is interposed between a structure main body and a base, and a gyro vibration control device is provided on the lowest floor of the structure. Structure.