JPS62155344A - Vibration energy absorbing device - Google Patents

Abstract

PURPOSE:To improve the vibration energy absorbing faculty by forming the diameter of the part which is inserted and jointed to the recessed parts of the end plates of an elastic plastic member larger than the diameter of the part positioned between the end plates and embedding a plurality of reinforcing members in the axial direction. CONSTITUTION:An energy absorbing body 26 is constituted of an elastic plastic member 30 formed into cylindrical form by lead and a plurality of reinforcing members 31 which are made of iron and buried into the elastic plastic member 30 in the axial direction. In said elastic plastic member 30, the both edge parts are formed into the shape (diameter d2) conforming to the recessed part 27 of each end plate 24, 25, and the center part is formed to the diameter of d1 (d1<d2). Though, when a relative displacement is generated in the lateral direction on the members 22 and 23 because of earthquake, etc., the force for stripping off the joint part between the elastic plastic member 30 and the end plates 24 and 25 and the force for drawing out the both edge parts of the elastic plastic member 30 from the recessed part 27 actuate, but said force is intensively suppressed by the above-described constitution.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a vibration energy absorption device used for vibration isolation or seismic isolation of structures, and particularly relates to a vibration energy absorption device that utilizes plastic deformation of a material. The present invention relates to an improvement of a vibration energy absorption device that absorbs vibration energy.

[Technical background of the invention and its problems]

Conventionally, in order to prevent structures from being destroyed by seismic force, various vibration energy absorbing devices have been interposed between, for example, a foundation and a structure body.

Such vibration energy absorption devices are classified based on the mechanism of energy absorption: viscous type devices that utilize the viscosity of a fluid or viscoelastic body, and Il! There are two main types: friction type, which uses friction, and plastic type, which uses plastic deformation of the material.

Among these, many of those that employ the plastic method utilize plastic deformation of metal materials, and have the advantage of being simpler in structure and lower in price than those of other methods. Lead or a lead-based alloy material or iron material is usually used as the elastoplastic member directly used for energy absorption. In particular, lead-based materials have excellent plasticity and have sufficient follow-up characteristics even in vibrations accompanied by large displacements.

By the way, conventional vibration energy absorbing devices that utilize the elastic-plastic properties of materials due to shear deformation generally do not.

It is constructed as shown in FIGS. 14, 15, and 19. That is, in the structure shown in FIG. 14, the end plates 3 and 4 are fixed to the members 1.2 of the two target structures so as to face each other.

The structure is such that an elastic-plastic member 5 made of, for example, a lead-based material processed into a cylindrical shape is interposed between these end plates 3.4. Note that each end plate 3, 4 and the elastic-plastic member 5 are joined by soldering or the like. Also.

In the device shown in FIG. 15, recesses 6 and 7 having the same diameter as the elastic-plastic member 5 are formed in the end plates 3 and 4, and both ends of the elastic-plastic member 5 can be simply inserted, fitted, or The elastic-plastic member 5 and each end plate 3.4 are bonded together by insertion and gluing. Furthermore, in the structure shown in FIG. 19, an elastic support, for example, a rubber bearing 8, for supporting the member 2 with respect to the member 1 is interposed between the end plates 3.4, and the rubber bearing 8 extends in the axial direction. Through hole 9
An elastic-plastic member 5 wound with a helical coil 10 having a rectangular cross section is housed in the through hole 9. Note that the rubber bearing 8 is made by laminating metal plates 11 and rubber plates 12 alternately.

In these vibration energy absorption devices, when the structure vibrates due to an earthquake or the like and a relative displacement occurs between the members 1 and 2, the elastic-plastic member 5 existing between the members 1 and 2 undergoes forced displacement. . Plastic deformation of the elastoplastic member 5 results in an energy loss equal to the amount of work required for its plastic deformation, which results in the absorption of vibration energy between the members 1.2 and a reduction in the vibration response of the overall structure.

However, the conventional vibration energy absorbing device configured as described above has the following problems.

That is, when the elastoplastic member 5 undergoes repeated lateral deformation due to earthquakes or the like, the joint surface between the elastoplastic member 5 and the end plates 3 and 4 in the one shown in FIG. 14 deforms as shown by P in FIG. There was a high risk of it peeling off. In addition, even in the case shown in FIG. 15, as shown by Q in FIG. There was a high possibility that the connector would come out of the recesses 6 and 7 and the bonded state would be released. If the bonded surface breaks or the bonded state is released in this way, the state will be the same as the breakage of the elastic-plastic member 5, and the function as an energy absorbing device will be lost. Furthermore, even if the joint between the first elastoplastic member 5 and the end plates 3 and 4 is strengthened, in the case shown in FIGS. 14 and 15, if the first elastoplastic member 5 is repeatedly deformed in the lateral direction,
Due to the difference in bending and tensile conditions between the part near the end plate 3°4 and the central part, the 18th
As shown in the figure, there is a constriction in the part X near the end plates 3 and 4.
Further, a bulge is generated in the central portion Y.

Therefore, the resistance force required for plastic deformation gradually decreases, and the energy absorption capacity decreases. and.

Eventually, the elastic-plastic member 5 breaks at the constriction.

There was a problem that the function as an energy absorption device was lost. On the other hand, in the case shown in FIG.

Since the helical coil 10 is wound around the outer periphery of the elastic-plastic member 5, the problem described in FIG. 18 is less likely to occur. However, with a structure like this.

Since the elastoplastic member 5 is housed in the rubber bearing 8, which is the support material for the structure, maintenance or replacement of the elastoplastic member 5 becomes very troublesome, and the earthquake resistance is reduced due to the decrease in the energy absorption performance of the elastic member 5. There was a problem in not being able to respond promptly to the weakening of gender.

That is, when the elastic-plastic member 5 undergoes repeated plastic deformation due to several earthquakes or vibrations, the structure of the elastic-plastic member 5 changes and the energy absorption capacity decreases. Therefore, in general, 9 elastoplastic members 5 are inspected.

If the characteristics are below a predetermined value, it must be replaced.

If such replacement is not performed, predetermined seismic resistance and reliability will not be obtained in the event of a second earthquake, which will seriously affect the safety of the structure. However, in the structure shown in FIG. 19, since the elastoplastic member 5 is located within the rubber bearing 8, the characteristics of the elastoplastic member 5 cannot be easily inspected. For this reason, there was a high possibility that the timing of replacement would be wrong. Further, in order to restrain radial deformation of the elastoplastic member 9 and allow shear deformation, a helical coil 10 is wound around the outer periphery of the elastoplastic member 5.

With such a structure, when the elastic-plastic member 5 is deformed by receiving relative deformation force due to relative displacement between the nine members 1 and 2, the helical coil 10 also undergoes relative deformation between the respective coils. In this case, since the spiral coil 10 is continuous,
A twisting force will act on this helical coil 10. As mentioned above, since the helical coil 10 takes charge of the radial deformation force of the elastic-plastic member 5, an excessive force, which is the sum of this force and the above-mentioned torsional force, acts on the helical coil 10. As a result, there is a possibility that the helical coil 10 may break. If it were to break, the restraining force against radial deformation would be reduced, resulting in a problem similar to that of the devices shown in FIGS. 14 and 15.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and its purpose is to be able to maintain the energy absorption function of an elastic-plastic member used for energy absorption for a longer period of time, and to facilitate maintenance. Another object of the present invention is to provide a vibration energy absorbing device that is easy to replace.

[Summary of the invention]

According to the present invention, the first and second end plates are supported by two members that move relative to each other during an earthquake or the like.

In the vibration energy absorbing device, an elastic-plastic member having plasticity is provided in such a manner that both ends thereof are inserted into and joined to recesses provided in the first and second end plates, and the elastic-plastic member is inserted into and joined to the recesses of the elastic-plastic member. at least a portion of the portion located between the first and second end plates of the elastic-plastic member is formed to have a diameter larger than that of the portion located between the first and second end plates, and the elastic-plastic member has a material strength higher than that of the elastic-plastic member. A vibration energy absorbing device is provided in which a plurality of large and small diameter reinforcing members are embedded at least in the axial direction.

〔Effect of the invention〕

When a vibration force that causes a relative displacement between two members is applied, such as during an earthquake, the two elastic-plastic members repeatedly undergo plastic deformation in accordance with the amount of relative displacement between the two members. When subjected to repeated deformation in this way, the joint between the elastoplastic member and each end plate may peel off.

A force acts that promotes the removal from the recess.

In other words, a force acts on the joint that causes it to break.

However, at least some of the parts inserted and joined into the recesses at both ends of the elastic-plastic member 9 are formed with a larger diameter than the part located between the plates, so the joining area is much larger than that of conventional ones. It can be widely used. Therefore, the joint strength can be significantly strengthened, and breakage can be prevented from occurring at this joint portion.

Further, when one elastoplastic member undergoes repeated deformation, a force acts on this elastoplastic member to form constrictions at both ends and a bulge at the center. However, since a reinforcing member is embedded in the first elastic-plastic member in the above-mentioned relationship, the presence of this reinforcing member can prevent the above-mentioned constriction and bulge from occurring. Therefore, it is possible to prevent the elastic-plastic member from breaking due to the occurrence of a constricted portion with a small number of repetitions.

In this way, it is possible to significantly increase the bonding strength between the elastoplastic member and the end plate, and to prevent the occurrence of constrictions in the elastoplastic member, allowing it to exhibit a stable energy absorption function over the long term. be able to.

In addition, since there is no need to arrange the elastic-plastic member in relation to other devices, the surface of the first elastic-plastic member can be left exposed or covered with a cover or anti-rust treatment film to prevent corrosion. can. For this reason, it is easy to inspect the current state and characteristics of the elastoplastic member after the completion of construction.
As a result, it can also contribute to incorrect replacement timing. moreover.

Since it can be installed independently of other devices, such as load supporting devices such as rubber bearings, it can also contribute to facilitating device replacement.

[Embodiments of the invention]

Hereinafter, nine embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows two structural members 22.2 to which a vibration energy absorbing device 21 according to an embodiment of the invention is actually intended.
It is a side view of the example installed between 3 rooms.

This vibration energy absorbing device 21 is roughly divided into members 2
2.23, an end plate 24.25 supported by bolts or the like (not shown) in a mutually facing relationship, and this end plate 24.2.
5 and an energy absorber 26 inserted between the two.

As shown in FIG. 2, the end plates 24 and 25 are provided with recesses 27 formed by hollowing out the end plates 24 and 25. In this embodiment, each of these recesses 27 is provided in the form of a through hole. And these recesses 27
is the diameter d formed on the opposite side of the 1 member 22.23
1 small diameter portion 28, and a large diameter portion 29 that once expands in a stepped shape from this small diameter portion 28 and then gradually tapers off as it approaches the 1 member 22, 23.

On the other hand, the energy absorber 26 is composed of an elastoplastic member 30 made of, for example, lead and formed into a columnar shape, and a plurality of reinforcing members 31 embedded in the elastoplastic member 30 in the axial direction. The elastoplastic member 30 has both ends shaped to match the recesses 27 of the end plates 24 and 25, and its center shaped like a cylinder with a diameter d1. And one both ends are each end plate 24.
It is inserted and joined into the recess 27 of 25. That is, this elastic-plastic member 30 is formed by casting using the inner surface of the recess 27 of the end plate 24, 25 as a part of the mold surface.

The outer surface of the portion of the second elastic-plastic member 30 inserted into each of the recesses 27 and the inner surface of the recess 27 are joined by fitting or brazing. In this embodiment, the reinforcing member 31 is made of iron, which has a higher tensile strength than the lead constituting the elasto-plastic member 30, and is made of iron that has a tensile strength in the radial direction of the elasto-plastic member 30 to the extent that it does not significantly affect the rigidity of the structure. A thickness that can resist deformation is used.

These reinforcing members 31 have the same length as the two elastic-plastic members 30, that is, a length that allows both ends to be located in the recesses 27 of each end plate 24, 25, and moreover, as shown in FIGS. As shown, they are embedded at equal intervals in the circumferential direction.

With such a configuration, the member 22.2 may be damaged due to an earthquake or the like.
When a relative displacement in the lateral direction in FIG. 1 occurs at 3, the elastoplastic member 30 undergoes repeated deformation as shown in FIG. Therefore, energy consumption necessary for plastic deformation occurs within the first elastic-plastic member 30, and this energy consumption provides the function as a vibration energy absorbing device.

In this case, if the elastic-plastic member 30 is repeatedly deformed.

A force that attempts to separate the joint between the elastic-plastic member 30 and the end plates 24 and 25 and a force that attempts to pull out both ends of the elastic-plastic member 30 from the recess 27 acts on the joint. However, both ends of one elastic-plastic member 30 are formed in the recesses 2 of each end plate 24,25.
7 and is joined to the inner surface of the recess 27,
Furthermore, the diameter d2 of the portion located within the recess 27 is larger than that of the other portions. Therefore, the bonding strength between the inner surface of the recess 27 and both ends of the elastic-plastic member 30 can be significantly increased compared to conventional ones, and as a result, peeling and handling at the bonded portion, that is, the bonding strength at the bonded portion can be greatly increased. Breakage can be prevented. Furthermore, even if a constriction or a bulge is generated in the elastic-plastic member 30 due to repeated deformation, this generated force is suppressed by the plurality of reinforcing members 31 embedded in the axial direction, and eventually the constriction or bulge is suppressed. Occurrence is also suppressed. in this way.

The mechanical strength of the joint between the elastoplastic member 30 and each end plate 24, 25 can be greatly increased, and the occurrence of constrictions and bulges can be prevented, resulting in a stable structure for a long period of time. It can exhibit energy absorption function. In general, with the above configuration, there is no need to provide the 9 elastoplastic member 30 in conjunction with other devices. Therefore, the elastic-plastic member 30
The surface may be exposed or only covered with a cover or coating to prevent corrosion. Therefore, it becomes easy to inspect the current state and characteristics of the elastoplastic member 30 after the earthquake has ended, and as a result, it can also contribute to preventing mistakes in the timing of replacement. Furthermore, as mentioned above, since it can be installed independently of other devices, such as load supporting devices such as rubber bearings, it can contribute to the ease of replacing the device, and in the end, the above-mentioned effects can be achieved. .

Note that the present invention is not limited to the embodiments described above, and can be modified in various ways. That is, in the embodiment described above, the recesses provided in each end plate 24, 25 have a through hole structure, but as shown in FIG. 6, the recesses 27a may have a bottomed hole structure.

Further, as shown in FIG. 7, a smooth curved surface portion 41 may be formed on the outer circumferential surface of the elastic-plastic member 30 at the boundary between the portion inserted into the recess 27 and the portion exposed to the outside. As shown in the figure, a smooth curved surface part 42 may be provided at the end of the small diameter part 28 opposite to the member, and further, as shown in FIG. You may omit the section.

Further, as shown in FIG. 10, the diameters of the large diameter portions 29a in the recessed portions 27b may be made equal in the axial direction.

Further, as shown in FIG. 11, an annular member 43 that connects the ends of each reinforcing member 31 in the circumferential direction is embedded in a portion located within the recess 27 of each end plate 24, 25 at both ends of the elastic-plastic member 30. You can do it like this. Also.

As shown in FIG.
1 may be curved so that their central portions approach each other and then embedded. Furthermore, a plurality of annular reinforcing members may be inserted in the axial direction to connect the reinforcing members 31 embedded in the axial direction in the circumferential direction.

In addition, in the embodiment shown in FIG. 1, each end plate is 24°, 2
5 is fixed to each member 22.23 with bolts or the like, and as shown in FIG. 13, recesses 44.45 for support are provided in each member 22.23.

Each end plate 24.25 is fitted into these recesses 44.45 to the extent that no resistance occurs in the axial direction.
．． 25 may be supported so as to be restrained only in the direction of relative movement. In this way, for example, the member 22.2 can be
Even if the distance between the three points changes, no compressive or tensile load acts on the energy absorbing device in the axial direction, so the change can be absorbed without affecting the energy absorption characteristics.

The shape of the roughly 9 elastoplastic member is not limited to cylindrical but may be prismatic, and its diameter and length are determined by the total number of energy absorbing Vt@ when actually installed, the mass of the target structure,
It is determined by the stiffness of the structure, the amount of energy absorption required and the plastic properties of the elastoplastic members used. Also 9
The material for forming the elastic-plastic member is not limited to lead, and lead-based alloys and iron can also be used.

[Brief explanation of drawings]

Fig. 1 is a side view of a vibration energy absorbing device according to an embodiment of the present invention when it is actually installed between two members, Fig. 2 is a longitudinal sectional view of the same vibration energy absorbing device, and Fig. 3 is the same. The vibration energy absorbing device is cut along line A-A in FIG. 1 and viewed in the direction of the arrow, and FIG. 4 is a diagram of the vibration energy absorbing device taken along line B-Bll in FIG. A view. FIG. 5 is a vertical cross-sectional view of the vibration energy absorbing device when it is performing an energy absorption operation, FIG. 6 is a vertical cross-sectional view of a vibration energy absorbing device according to another embodiment of the present invention, and FIGS. FIG. 11 is a diagram for explaining a modification, FIG. 12 is a vertical cross-sectional view of a vibration energy absorbing device according to still another embodiment of the present invention, and FIG. 12 is a vertical cross-sectional view of a conventional vibration energy absorbing device. 16 to 18 are diagrams for explaining the problems of the conventional device, and FIG. 19 is a longitudinal sectional view of yet another example of the conventional vibration energy absorbing device. 21... Vibration energy absorption device, 22.23... Member that moves relative to each other during an earthquake, etc., 24.25... End plate. 26...Energy absorber, 27.27a...Recess. 30... Elastic-plastic member, 31... Reinforcement member. Figure 4 Figure 11

Claims (4)

[Claims] (1) The device is for absorbing kinetic energy during relative motion between two members, and includes first and second end plates supported by each of the members and each having a recess, and both ends. an elastoplastic member having plasticity inserted between the first end plate and the second end plate by being inserted and joined into the recesses of the first and second end plates. In the vibration energy absorbing device, at least a portion of the portion of the elastoplastic member inserted and joined to the recess is formed to have a diameter larger than a diameter of a portion of the elastoplastic member located between the first and second end plates. A vibration energy absorbing device characterized in that a plurality of reinforcing members having a material strength greater than that of the elastic-plastic member and having a small diameter are embedded in the elastic-plastic member at least in the axial direction. (2) The vibration energy absorbing device according to claim 1, wherein the elastic-plastic member is made of one selected from lead, a lead-based alloy, and iron. (3) The vibration energy absorbing device according to claim 1, wherein the plurality of reinforcing members embedded in the axial direction are arranged in the circumferential direction. (4) The portion of the elastoplastic member inserted into the recess is formed in a shape whose diameter increases as it moves away from the center of the elastoplastic member. Vibration energy absorbing device as described in .