JPH10231888A - Vibration energy absorber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration energy absorber whereby an intermediate/small scaled earthquake and horizontal displacement of a building are absorbed, without destruction relating to repeated deformation, a stable damping characteristic can be realized, in the case of leading to limited enormous displacement, tensile force acts, to be made capable of functioning as a displacement stopper. SOLUTION: In a damper 11, an element wire 11a, formed of metal material of steel or the like applying proper surface treatment, plastic, and engineer plastic of high toughness, is stranded and twisted together or parallelly arranged, to be constituted by bundling a plurality of parts, both end parts and central or intermediate part thereof, by a caulking member 9, both end parts of the damper 11 bundling this element wire 11a are loosened by a length 1.5 to 5.0 preferably 2.0 to 4.0 times a space between a concrete base 1 and an upper part structure 2, to provide a loosening margin (deformation margin), thereafter to be fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration energy absorbing device for seismic isolation of buildings such as buildings and detached houses, and civil structures such as bridges, and more particularly to a function of absorbing horizontal vibration energy for earthquake motion. The present invention relates to a vibration energy absorbing device having a stopper function for preventing a building from overturning and a bridge from falling.

[0002]

2. Description of the Related Art Conventionally, vibration energy absorbing devices for seismic isolation of buildings such as buildings and detached houses, and civil structures such as bridges are provided between a concrete foundation on the foundation side and an upper structure to be seismically isolated. It is installed with a load supporting device. The vibration energy absorbing device includes a steel rod damper that absorbs energy by plastic deformation of a steel rod, a ring damper that absorbs energy by bending plastic deformation of a stainless ring, and a helical vibration absorber. Loop steel rod damper that absorbs energy by curvature plastic deformation of steel rod, and U-shaped lead rod 3 installed between foundation 1 and upper structure 2 as shown in FIG. Dampers are known.

[0003] Incidentally, the above-mentioned damper has a function of attenuating the motion of vibration or seismic motion by energy consumption and suppressing the relative motion between two members. Broadly classified, metallic dampers belong to the former, and are classified into the above-described steel dampers and lead dampers according to materials. Due to the high yield stress of steel dampers, elasticity is dominant in small and medium-sized earthquakes and relatively lightweight structures, making it difficult to obtain effective damping. Since deformation is difficult to return to the original shape, the deformation is accumulated each time a load is repeatedly applied, and eventually leads to breakage, and thus there is a problem that it is very difficult to extend the life.

[0004]

However, a metallic damper such as a lead damper as shown in FIG. 5 has a distance of 1 between the base part 1 to be seismically isolated and the upper structure 2, and has, for example, a shear strain. In order to realize the limit of 250%, it is necessary to extend 2.693 times in the axial direction as shown in FIG.
This is difficult to achieve with metallic properties.

The present invention has been devised in view of such a conventional problem, and is a wire damper in which a plurality of wires made of metal or plastic are braided, twisted, or arranged in parallel and bundled. While maintaining the characteristics of the above, and by providing a deformation allowance by loosening the wire damper by a predetermined length in advance, it realizes stable damping characteristics by absorbing small and medium-sized earthquakes and horizontal displacement of buildings It is another object of the present invention to provide a vibration energy absorbing device capable of functioning as a displacement stopper by applying a tensile force when a critical displacement is reached.

[0006]

According to the present invention, there is provided a vibration energy absorbing apparatus comprising a damper provided between a concrete foundation on a foundation side and an upper structure to be seismically isolated. The damper is configured by bundling a plurality of strands made of metal or plastic,
Both ends of the bundled wire damper are loosened and fixed to a length of 1.5 to 5.0 times, preferably 2.0 to 4.0 times the gap between the concrete base and the upper structure. The main point is that it has been made.

[0007] The wire damper is formed by braiding or twisting or arranging wires in parallel and bundling them with a caulking member, and the wire damper has a circular or elliptical cross-sectional shape. Alternatively, it is preferably a polygon.
Further, the strand of the strand damper can be made of engineering plastic having high toughness.

Further, the initial length of the bundled wire dampers is set to a lateral displacement limit of the concrete foundation or the upper structure. Further, between the concrete foundation on the foundation side and the upper structure to be seismically isolated, a plurality of bundled wire dampers are arranged via a load supporting device,
This bundled wire damper is a pair of a wire damper to which a torsional moment is applied in the right direction and a wire damper to which a torsional moment is applied in the left direction. It is also possible to arrange a plurality of sets.

The present invention is configured as described above, and is used for seismic isolation of a building such as a building or a detached house, or a civil structure such as a bridge.
As a device to absorb energy such as earthquakes, typhoons, traffic vibrations, etc., vibration energy absorption by installing a damper with a load supporting device between the concrete foundation on the foundation side and the upper structure to be seismically isolated Device. As the damper, a wire made of a metal material such as steel having appropriate surface treatment, plastic, or engineering plastic having high toughness is braided, twisted, or arranged in parallel so that both ends and the center thereof are provided. The part or the intermediate part is constructed by bundling one or more places with a caulking member, utilizing surface friction and plastic deformation between the wires and the fixed part, and sufficient horizontal displacement during earthquake motion. In order to realize stable damping characteristics by absorbing the horizontal displacement of small and medium-sized earthquakes and buildings, relax the length enough to absorb in advance in advance, and realize the stable damping characteristics. In this case, a pulling force acts to function as a displacement stopper.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The same components as those of the conventional example are denoted by the same reference numerals, and description thereof will be omitted. FIG. 1 is a schematic side view of a vibration energy absorbing device embodying the present invention. The vibration energy absorbing device is not shown between a concrete base 1 on a foundation side and an upper structure 2 to be seismically isolated. A load supporting device such as a laminated rubber bearing in which a rubber sheet and an intermediate steel plate are laminated is also provided.

The dampers 11 are provided with wires 11a made of a metal material such as steel or plastic having a suitable surface treatment, plastics or engineering plastics having high toughness. Are bundled by the caulking member 9, and both ends of the damper 11 which bundles the strands 11 a are 1.5 to 5.0 times the gap between the concrete base 1 and the upper structure 2. Length, preferably 2.0-4.0 times to allow for slack X
After the (deformation allowance) is provided, it is fixed.

Further, the wire 11a may be braided or twisted to eliminate the need for a caulking member. Furthermore, the initial length of the bundled wire dampers 11 is
Or, it is set to the lateral displacement limit of the upper structure 2, and when it reaches the limit huge displacement, the pulling force acts to function as a displacement stopper, effectively preventing the building from overturning and dropping bridge. It is configured as follows.

If the relaxing length of the damper 11 is less than 1.5 times the gap between the concrete base 1 and the upper structure 2, there is a problem that effective horizontal displacement cannot be obtained during an earthquake. If it is more than 0 times, there is a problem that the laminated rubber bearing attached thereto is broken. Further, in the embodiment of the present invention, the strands 11a of the damper 11 are formed by braiding, twisting, or arranging the strands 11 in parallel.
By utilizing the surface friction between the space and the fixed part and the plastic deformation to absorb the small and medium-sized earthquakes and the horizontal displacement of the building, the damping characteristics are realized. The cross-sectional shape of the wire 11a is a hexagonal shape that has a large friction coefficient and can achieve close-packing, and is configured as a plurality of bundles. It is also possible to use squares.

FIG. 3 and FIG. 4 show another embodiment of the present invention. In this embodiment, a concrete base 1 on a foundation side and an upper structure 2 to be seismically isolated are provided. A plurality of bundled wire dampers 1 to which twist deformation has been given in advance
2 is arranged. The bundled wire damper 12 is composed of a wire damper 12a to which a torsional moment Mx is given in advance to the right and a torsional moment My to the left.
And a plurality of pairs (even number pairs) are arranged so as to cancel out the torsional moments Mx and My with each other with the element wire damper 12b provided with the element wire damper 12b, and cancel the appearance of the torsional moments Mx and My outside. Thus, the attenuation characteristics are improved.

As described above, the embodiment of the present invention is a device for absorbing energy such as earthquakes, typhoons, traffic vibrations, etc. in seismic isolation of buildings such as buildings and detached houses and civil structures such as bridges. A damper 1 in which strands 11a are bundled between a concrete base 1 on the foundation side and an upper structure 2 to be seismically isolated.
1 is a vibration energy absorbing device. As the damper 11, a wire 11a made of a metal material such as steel having appropriate surface treatment, plastic, or high-toughness engineering plastic is braided, twisted, or arranged in parallel, and both ends are formed. A plurality of portions at the central portion or the intermediate portion are bundled by a caulking member 9 to utilize surface friction and plastic deformation between the wires 11a and the fixed portion, and to reduce horizontal displacement at the time of earthquake motion. Relax the length enough to absorb enough in advance to achieve stable damping characteristics by absorbing small and medium-sized earthquakes and horizontal displacement of buildings. The force acts and can function as a displacement stopper.

In addition, it does not break down like a lead when subjected to a repeated load while allowing a larger displacement than a steel rod damper.

[0017]

According to the present invention, there is provided a vibration energy absorbing device having a damper installed between a concrete base on a foundation side and an upper structure to be seismically isolated as described above.
The damper is configured by bundling a plurality of wires made of metal or plastic, and the both ends of the bundled wire damper are 1.5 to 5.0 times the gap between the concrete base and the upper structure. By relaxing the length and providing a deformation allowance, it is possible to realize stable damping characteristics by absorbing small and medium-sized earthquakes and horizontal displacement of buildings, and also when a huge displacement is reached Has the effect that a tensile force acts to function as a displacement stopper.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a vibration energy absorbing device embodying the present invention.

FIG. 2 is a cross-sectional view of a wire damper in which a wire has a large frictional force and a cross-sectional shape for achieving close packing.

[Fig. 3] A plurality of bundled wire dampers, which have been twisted and deformed in advance, are provided in parallel with a load supporting device between a concrete foundation on the foundation side and an upper structure to be seismically isolated. FIG. 10 is a side view showing another embodiment which is slackened in a vertical plane.

FIG. 4 is an explanatory plan view showing a case where a plurality of bundled wire dampers of FIG. 3 are arranged in a loop from top to bottom.

FIG. 5 is an explanatory view of a conventional lead damper that absorbs energy by installing a U-shaped lead bar between a foundation and an upper structure.

FIG. 6 shows the distance between the base part to be seismically isolated and the superstructure,
FIG. 7 is an explanatory diagram of a graph showing a relationship with a shear strain limit when shear deformation is 250%.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Foundation 2 Upper structure 3 Lead bar 6a Attachment part of wire damper 7 Metal wire 8a, 8b Upper and lower flanges 9 Caulking member 11 Damper 11a Element wire 12 Element damper 12a Element to which a torsional moment Mx is given in the right direction. Wire damper 12b Wire damper to which a torsional moment My is applied in the left direction

Claims (6)

[Claims] 1. A vibration energy absorbing device comprising a damper installed between a concrete foundation on a foundation side and an upper structure to be seismically isolated, wherein the damper comprises a plurality of wires made of metal or plastic. And the ends of the bundled wire damper are slackened to a length of 1.5 to 5.0 times the gap between the concrete base and the upper structure to be fixed. And vibration energy absorbing device. 2. The vibration energy absorbing device according to claim 1, wherein the wire damper is configured by braiding or twisting the wires, or arranging the wires in parallel and bundling them with a caulking member. 3. The wire damper according to claim 1, wherein a wire cross section of the wire damper is a circle, an ellipse, or a polygon.
A vibration energy absorbing device according to item 1. 4. The vibration energy absorbing device according to claim 1, wherein the strand of the strand damper is made of a highly tough engineering plastic. 5. An initial length of the bundled wire damper,
5. The vibration energy absorbing device according to claim 1, wherein the vibration displacement is set to a lateral displacement limit of the concrete base or the upper structure. 6. A plurality of bundled wire dampers are disposed between a concrete base on the foundation side and an upper structure to be seismically isolated, and the bundled wire dampers are previously screwed to the right. A plurality of wire dampers having a twisting moment and a wire damper having a twisting moment in a left direction are provided as a pair, and a plurality of sets are arranged so as to cancel each other out of the torsional moment. Claim 3, Claim 4 or Claim 5
A vibration energy absorbing device according to item 1.