JPH09279608A - Foundation damping structure of wooden house - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foundation damping structure which is proper to a wooden house, simple in structure and inexpensive. SOLUTION: A board-like viscoelastic damper 3, which sandwiches a viscoelastic body 6 made of a high molecular material as a raw material between upper and lower steel plate 4 and 5, is inserted between a foundation 1 and a ground sill 2 of he wooden house. When an earthquake broke out, this viscoelastic damper 3 is subjected to deformation so that damping properties may be added to a ground sill of a house, thereby absorbing earthquake energy and reducing input energy to a skeleton. The board-like viscoelastic damper 3 is compact in size and dispenses with a large installation space required for a conventional rubber-made seismic base isolation device and can be set up in a small clearance between the foundation 1 and the ground sill 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a basic vibration control structure for wooden houses using viscoelastic dampers.

[0002]

2. Description of the Related Art When considering the earthquake resistance of a building, it is most effective not to input the energy of the earthquake into the building. At present, the seismic isolation structure is in the limelight. There is.

Usually, a combination of laminated rubber and a damper is used as a seismic isolation device for a large-scale building. However, in order to adopt such a seismic isolation device for a wooden house of a private house scale, it takes a lot of space and cost, and the weight of the building is too light. I can't show it to the full.

The present invention is intended to solve the above-mentioned problems, and an object thereof is to provide a simple and low-cost basic vibration control structure suitable for a wooden house.

[0005]

A basic vibration control structure for a wooden house of the present invention is a wooden house with a viscoelastic damper formed by sandwiching a plate-shaped viscoelastic body between upper and lower plate-shaped members in a sandwich shape. It is characterized by being installed between the foundation and the base.

A plate-shaped viscoelastic damper interposed between the foundation and the base absorbs vibration energy and suppresses vibration of a wooden house due to an earthquake or traffic vibration.

The viscoelastic body is made of a polymer material as a raw material and various blends are commercially available. However, the viscoelastic body has an elliptic loop hysteresis characteristic as shown in FIG. 8 and a speed-dependent damping characteristic. Further, the structure and the shape have a high degree of freedom, and the viscoelastic damper in various forms can be easily manufactured.

It has been confirmed by experiments that the viscoelastic body can effectively absorb energy from a small deformation to a large deformation. The property of restoring is different from other dampers. From this point of view, the viscoelastic damper is effective for seismic reinforcement of buildings of any structural shape.

[0009]

1 and 2 show an embodiment of the basic vibration control structure of the present invention, in which a foundation 2 is installed on a footing foundation 1 of a general wooden house. In, the viscoelastic damper 3 including the viscoelastic body 6 as a constituent element is installed between the base 1 and the base 2. The details are set so that no compressive force is applied to the viscoelastic body 6.

FIG. 1 (b) shows a typical form of the viscoelastic damper 3 used in the present invention, in which the viscoelastic body 6 is formed into a plate shape and sandwiched between the upper and lower steel plates 4 and 5. I'm out. Further, in this example, the outer peripheral portion of the lower steel plate 5 is bent to form a box shape so that the vertical compressive force is not applied to the viscoelastic body 6 whose upper and lower surfaces are bonded to the steel plates 4 and 5, respectively. There is. The structure to which the compressive force is not applied is not limited to this, and may be, for example, a structure in which a spacer is arranged outside the viscoelastic body 6 between the upper and lower steel plates 4 and 5 (in the case of a flat plate).

Various designs of the viscoelastic damper 3 in plan view, thickness, number of installations, etc. are possible, and the viscoelastic dampers 3 are arranged according to the design of the wooden house.

Further, when the viscoelastic damper 3 actually functions, the base 2 moves relative to the base 1, but when the base 2 needs to be fixed to the base 1. Is a structure in which the adhesive force is cut off by a horizontal force above a predetermined level, for example, by filling a mortar or the like with a synthetic resin plate made of ethylene tetrafluoride or the like having a low friction coefficient interposed between the viscoelastic dampers 3. In addition, a structure is conceivable in which a fixing portion of an anchor bolt for fixing the base 2 to the base 1 is a loose hole to allow horizontal displacement.

As described above, according to the present invention, the viscoelastic body 6 made of a polymer material is sandwiched between the upper and lower plate members such as the steel plates 4 and 5 and the plate-shaped viscoelastic damper 3 is installed in the wooden house. Insert it between the foundation 1 and the base 2, and add damping to the house by deforming this viscoelastic damper 3 at the time of earthquake etc., absorb vibration energy, reduce input energy to the frame, It is possible to improve the earthquake resistance and anti-vibration performance of the building.

Since the plate-like viscoelastic damper 3 is compact, it does not require a large installation space like the conventional base isolation structure using laminated rubber, and has a small gap between the foundation 1 and the base 2. Can be installed by using.

[0015]

EFFECTS OF THE INVENTION The viscoelastic damper used in the present invention has a high degree of freedom in its shape, and when it is formed in a plate shape, it becomes very compact and unnecessary space for installation is unnecessary. In addition to the low cost of the viscoelastic damper itself, there is almost no increase in the cost of the building. Therefore, it is optimal when the place is limited and low cost is required, such as an individual wooden house.

Since a viscoelastic body having a stable energy absorption capacity from a small amplitude to a large amplitude is used as the material of the damper, it has an excellent vibration damping function against earthquake motions and traffic vibrations having various vibration characteristics. Demonstrate.

[Brief description of drawings]

1A and 1B show an embodiment of a basic vibration control structure of the present invention, wherein FIG. 1A is a perspective view and FIG. 1B is a front view showing an example of the form of a viscoelastic damper.

FIG. 2 is a vertical sectional view corresponding to the embodiment of FIG.

FIG. 3 is a graph showing hysteresis characteristics of a viscoelastic damper.

[Explanation of symbols]

1 ... Footing foundation, 2 ... Base, 3 ... Viscoelastic damper,
4, 5 ... Steel plate, 6 ... Viscoelastic body, 7 ... Broken stone, 8 ... Waste concrete

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroaki Kanzawa 3-6-1, Kitakyuhoji-cho, Chuo-ku, Osaka City Konoikegumi Osaka Main Store

Claims (1)

[Claims] 1. A wooden structure in which a viscoelastic damper formed by sandwiching plate-shaped viscoelastic bodies sandwiched between upper and lower plate-shaped members is installed between a foundation of a wooden house and a foundation. Basic vibration control structure of a house.