JP2001140965A - Superplastic metallic damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a superplastic metallic damper for absorbing vibrational energy by making use of shear deformation of a superplastic metal excellent in ductility. SOLUTION: Both ends of a superplastic metallic body obtained by working a superplastic metal excellent in ductility such as a zinc-aluminum alloy (Zn-Al alloy) into such a shape (the height/diameter ratio is not more than 1) excellent in shear deformation are bonded by metallic ring-shaped bodies having strength and rigidity higher than that of the superplastic metal. External force by the earthquake is applied to the superplastic metallic body through the ring-shaped bodies on both ends, and a superplastic metallic damper is used so that shear deformation may be generated on the superplastic metallic body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superplastic metal damper which absorbs vibration energy by utilizing the shear deformation of a superplastic metal having extremely high ductility such as a zinc-aluminum alloy (Zn-Al alloy). Belongs to the technical field.

[0002]

2. Description of the Related Art Conventionally, as a so-called metal-based damper which utilizes the mechanical properties of metal, there are many which utilize bending deformation of a steel rod. The drawback is that the bending yield concentrates on one bending of the steel rod, and the deformation performance as a damper is small, and the energy absorption capacity is small.

In order to prevent the bending deformation of the steel rod from being concentrated at one point, Japanese Patent Application Laid-Open No. 146,651 discloses a technique.
A steel rod damper made of a steel rod processed into a shape similar to the bending moment distribution is disclosed. JP-A-61-17997
No. 2 discloses a damper having a configuration in which a deformation guide is provided to expand a bending plasticity region. JP-A-2-
JP-A-128844 and JP-A-7-332419 disclose a drum-shaped damper based on a similar concept. However, in any case, the stress state at the time of mounting is not always as expected, and there is also a problem that it is not easy to design and manufacture because it is not a simple shape.

[0004] Next, when a damper is formed by using shear deformation of a plastic metal such as lead, there is a problem in a method of attaching the damper (a method of transmitting a force). Therefore, Patent No. 26501
No. 53 proposes a damper having a configuration in which the upper and lower ends of lead and the mounting plate are directly joined as an alloy (alloy) of both metals. In the invention of Japanese Patent No. 2647609, a lead alloy having a large shear strength is used in a portion including flanges (mounting plates) at both ends, and a lead metal is used in an intermediate portion thereof, each of which has a strength exceeding the strength of the lead alloy. A bonded damper is proposed.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to have a simple shape, easy to design and manufacture, and to realize mechanically and clearly a mounting method and a force transmitting method at the time of mounting. An object of the present invention is to provide a superplastic metal damper having excellent deformation performance and large energy absorbing ability.

[0006]

As a means for solving the above-mentioned problems, a superplastic metal damper according to the first aspect of the present invention comprises a zinc-aluminum alloy (Zn-Al alloy).
Alloy) is processed into a shape (height / diameter ratio is 1 or less) in which the shear deformation is excellent in a ductile superplastic metal such as an alloy. Constrained by a metal ring having high rigidity, external force due to an earthquake or the like is applied to the superplastic metal through the ring at both ends, and the superplastic metal is used so that shear deformation occurs. It is characterized by the following.

According to a second aspect of the present invention, there is provided a superplastic metal damper having a shape (height / diameter of height / diameter) in which a ductile superplastic metal such as a zinc / aluminum alloy (Zn / Al alloy) is also excellent in shear deformation. A ratio of 1 or less) is obtained by processing both ends of a superplastic metal body processed into a ring-shaped body of metal having strength and rigidity greater than that of the superplastic metal as one unit. A plurality of long superplastic metal damper units are laminated and joined together, and the ring-shaped bodies of adjacent units are connected by a beam-shaped restraining member with high strength and rigidity to restrict bending deformation. It is characterized by the following.

According to a third aspect of the present invention, there is provided the superplastic metal damper according to the second aspect, wherein a ring-shaped body in a long superplastic metal damper unit formed by laminating and joining a plurality of units in series is provided. It is characterized in that a deformation constraint guide for restricting the occurrence of shear deformation of a certain size or more in a unit superplastic metal body is provided.

[0009]

FIG. 1 shows an embodiment of a superplastic metal damper 1 according to the first aspect of the present invention.

This is a zinc aluminum alloy (Zn A
1) is formed by processing a superplastic metal with high ductility, such as alloy 1), into a shape with excellent shear deformation (in the case of a cylinder, the height / diameter ratio is usually about 1 or less). Are restricted by ring-shaped bodies 3, 3 of a metal (for example, steel) having higher strength and rigidity than the superplastic metal.

In this superplastic metal damper 1, a superplastic metal body 2 is disposed vertically (vertically) with respect to upper and lower structures 4, 5 forming a seismic isolation layer, and ring-shaped bodies 3, 3 at both upper and lower ends are formed. Are directly attached to the structures 4 and 5, and a horizontal force (external force) due to an earthquake or the like is applied to the superplastic metal body 2 as a shearing force, so that the superplastic metal body 2 is used so that shear deformation occurs (FIG. 2). See).

By using the ring-shaped body 3, a normal mounting method can be performed on the upper and lower structures 4, 5. For example, various means for directly attaching the ring-shaped body 3 itself to the attachment portion or indirectly attaching the ring-shaped body 3 to the structures 4 and 5 by separately providing an attachment plate or the like can be implemented.

The superplastic metal damper 1 shown in FIG.
When subjected to shear deformation as shown in FIG. 2, the horizontal elastic stiffness K is G, the shear elastic modulus of the superplastic metal, the shear cross-sectional area of the superplastic metal body 2 is A, and the height of the superplastic metal body 2 is h, when the yield stress of the superplastic metal is τ _y , K is approximately K = G
-It is calculated by the formula of A / h.

[0014] The load shear force Q is caused plastic deformation δ reaches a certain yield point Q _y shown in FIG. 3, the energy absorption is performed to draw a hysteresis loop according to deformation of the positive and negative due to vibration. In particular, in the case of the superplastic metal damper 1, unlike the conventional steel bar damper, the plastic deformation δ is, as illustrated in FIG. 2, the upper and lower ends of the superplastic metal body 2 in the height direction. Since the shearing and yielding are performed almost equally over the entire length (effective length) excluding the portions of the ring-shaped bodies 3 and 3, the deformation performance as the damper is large, and the energy absorbing ability is extremely large.

Next, FIGS. 4 to 6 show an embodiment of a superplastic metal damper according to the second aspect of the present invention.

The superplastic metal damper of the embodiment shown in FIG. 1 is a superplastic metal damper of the embodiment shown in FIG. 1, that is, a superplastic metal having a high ductility such as a zinc-aluminum alloy (Zn-Al alloy) is excellent in shear deformation. Shape (height / diameter ratio is 1
In the case of FIG. 4, a unit formed by restraining both ends of a superplastic metal body 2 processed as described in (1) below with metal ring-shaped bodies 3 and 3 having greater strength and rigidity than the superplastic metal is defined as one unit. Is basically composed of a "long superplastic metal damper unit 11" formed by laminating and joining three units (however, a plurality of units necessary for design). Because Figure 1
This is because the relative horizontal displacement δ between the ring-shaped bodies 3 at the upper and lower ends is not so large even though the superplastic metal body 2 is used in only one unit of the superplastic metal damper 1 shown in FIG. . The damper unit 11 of FIG.
A double relative horizontal displacement δ can be realized.

As a method for manufacturing the long superplastic metal damper unit 11 shown in FIG. 4, three superplastic metal dampers 1 shown in FIG. And a method in which a superplastic metal body 2 having a total length of H is prepared in advance, and four ring-shaped bodies 3 are fitted and constrained with an interval h therebetween. Can be implemented.

FIG. 5 shows four long superplastic metal damper units 11 configured as shown in FIG. 4 arranged side by side as shown in FIG. Are connected to each other by a beam-shaped restraining member 12 such as a shaped steel member having high strength and rigidity, and at least the bending deformation is restrained at a restraining position by each ring-shaped body 3, and is a long and composite super-long type. 3 shows an embodiment of a plastic metal damper. Long superplastic metal damper unit 11 in FIG.
The shear deformation due to the horizontal force becomes more prominent as the height H increases. Therefore, the rigidity of the beam-shaped restraining member 12 at the restrained position by each ring-shaped body 3 prevents the bending deformation from being dominant, and secures the substantial shear deformation of the superplastic metal body 2.

FIG. 7 shows a long superplastic metal damper unit 1 constructed as shown in FIG. 4 of the second embodiment.
In 1, considering that the deformation may concentrate on the superplastic metal body 2 of any unit, the superplastic metal body 2 of each unit is provided on each ring-shaped body 3 except for the top one. The invention is characterized in that a deformation restraining guide 13 for restricting the occurrence of shear deformation of a certain size or more is provided upward (the invention according to claim 3). The shear deformation of the superplastic metal body 2 in each unit is restricted to the maximum amount of deformation allowed by the deformation constraint guide 13, and each unit generates a shear deformation having an average size as a whole.

When the deformation restraining guide 13 is provided downward, the deformation restraining guide 13 is installed on each ring-shaped body 3 except for the lowest one.

[0021]

The superplastic metal damper according to the first to third aspects of the present invention utilizes the plastic flow of the superplastic metal, and therefore has excellent deformation performance following large interlaminar deformation of the seismic isolation layer. It is possible to provide a damper having a large energy absorption capacity and exhibiting a large damping performance. In addition, there is an advantage that the initial rigidity and yield strength of the damper can be arbitrarily designed.

In addition, there is an advantage that the shape of the damper is simple, the design and manufacture are easy, and the mounting method and the force transmitting method at the time of mounting can be realized mechanically and clearly.

[Brief description of the drawings]

FIG. 1 is an elevational view showing an embodiment of the invention described in claim 1;

FIG. 2 is an explanatory diagram of the deformation performance of the damper.

FIG. 3 is a load-deformation performance diagram of the damper.

FIG. 4 is an elevational view of an elongated damper unit.

FIG. 5 is an elevational view showing an embodiment of the invention described in claim 2;

FIG. 6 is a plan view of the damper.

FIG. 7 is an elevation view of a different embodiment of the damper.

[Explanation of symbols]

 Reference Signs List 1 superplastic metal damper 2 superplastic metal body 3 ring-shaped body 11 long damper unit 12 beam-shaped restraining member 13 deformation restraining guide

Claims (3)

[Claims] 1. A superplastic metal obtained by processing a superplastic metal having a high ductility such as a zinc-aluminum alloy (Zn-Al alloy) into a shape (height / diameter ratio is 1 or less) in which shear deformation is excellent. Both ends of the body are constrained by a metal ring having strength and rigidity greater than that of the superplastic metal, and an external force due to an earthquake or the like is applied to the superplastic metal through the ring at both ends, A superplastic metal damper, which is used to cause shear deformation in a plastic metal body. 2. A superplastic metal obtained by processing a superplastic metal having a high ductility such as a zinc-aluminum alloy (Zn-Al alloy) into a shape (height / diameter ratio is 1 or less) having excellent shear deformation. A long superplastic metal formed by laminating and joining a plurality of units in series, with one end being formed by constraining both ends of the body with a metal ring-shaped body having higher strength and rigidity than the superplastic metal A superplastic metal damper, wherein a plurality of damper units are juxtaposed, and a ring-shaped body between adjacent units is connected by a beam-shaped restraining member having high strength and rigidity to restrain bending deformation. 3. A ring-shaped body in a long superplastic metal damper unit formed by laminating and joining a plurality of units in series, wherein the superplastic metal body of each unit is subjected to a shear deformation of a predetermined size or more. The superplastic metal damper according to claim 2, wherein a restricting deformation constraint guide is provided.