JPS62155343A - Vibration energy absorbing device - Google Patents

Abstract

PURPOSE:To improve the vibration energy absorbing faculty by embedding the first reinforcing member group into an elastic plastic member from the first end plate to the second end plate and embedding the second reinforcing member group, crossing the boundary parts of the end plates. CONSTITUTION:The captioned vibration energy absorbing device 21 is constituted of end plates 24 and 25 supported by members 22 and 23, and an energy absorbing body 26 inserted between these end plates 24 and 25. Each recessed part 27 is formed on the end plates 24 and 25 as shown in the figure. The energy absorbing body 26 is constituted of an elastic plastic member 30 formed into cylindrical form by lead, the first reinforcing member 31a (reinforcing member 32), and the second reinforcing member group 31b and 31c (reinforcing members 33 and 34) which are buried into the elastic plastic member 30 in the direction of axis. Therefore, the generation of cracks at the boundary part R is prevented, and the generation of neck-in and bulging-out of the elastic plastic member 30 is suppressed.

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 to a vibration energy absorption device that utilizes plastic deformation of a material. The present invention relates to an improvement in a vibration energy absorbing device.

[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, I11100 devices that utilize IIIEW of similar materials, and type I11100 devices that utilize plastic deformation of materials. It is broadly divided into those using the plastic method.

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 imaging energy absorption devices that utilize elastoplastic properties due to shear deformation of materials generally do not.

The configuration is as shown in FIGS. 10, 11, and 15. That is, in the structure shown in FIG. 10, end plates 3 and 4 are fixed to members 1 and 2 of two target structures, respectively, 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 and 4. Note that each end plate 3.4 and the elastic-plastic member 5 are joined by soldering or the like. Also.

In the case shown in FIG. 11, concave portions 6.7 having the same diameter as the elastic-plastic member 5 are formed in the end plates 3, 4, and both ends of the elastic-plastic member 5 are simply inserted into these concave portions 6.7, IO! The elastoplastic member 5 and each of the end plates 3 and 4 are bonded together by bonding or insertion. Furthermore, what is shown in FIG.
An elastic support, such as a rubber bearing 8, for supporting the member 2 with respect to the member 1 is interposed between the end plates 3 and 4, and a through hole 9 extending in the axial direction is provided in the rubber bearing 8. An elastic-plastic member 5 wound with a helical coil 10 having a rectangular cross section is housed inside. Note that the rubber bearing 8 is made by laminating metal plates 11 and rubber plates 12 alternately.

In these imaging energy absorbing devices, when a structure moves 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 is forcibly displaced. receive. Plastic deformation of the elastic-plastic member 5 results in an energy loss equal to the amount of work required for its plastic deformation, which results in the absorption of turbulence energy between the members 1.2 and a reduction in the imaging response of the entire structure. Ru.

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 connection between the elastoplastic member 5 and the end plate 3.4 as shown by P in FIG. There was a high risk that the surface would peel off. In addition, in the case shown in FIG. 11, as shown by Q in FIG. 13, there is a crack at the boundary R between the ends of the elastic-plastic member 5 and the part inserted into the recess 6.7, resulting in a bonded state. There was a strong possibility that it would be released. If the bonding surface breaks or cracks occur in this manner, it will be in the same state as the elastoplastic member 5 breaking, and the function as an energy absorbing device will be lost. In addition, 9 elastic-plastic members 5 and end plates 3 and 4
10 and 11, even if the joint with the

When the elastic-plastic member 5 is repeatedly deformed laterally, the end plate 3.4
Due to the difference in bending and tensile conditions between the part near the end plate 3.4 and the central part, a constriction can be formed in the part X near the end plate 3.4 and in the central part Y with a relatively small number of repetitions, as shown in FIG. A bulge develops. Therefore, the resistance force required for plastic deformation gradually decreases, and the energy absorption capacity decreases. There is a problem in that the elastic-plastic member 5 eventually breaks at the constricted portion and loses its function as an energy absorbing device. On the other hand, in the case shown in FIG. 15, the helical coil 10 is wound around the outer periphery of one elastic-plastic member 5, so the problem described in FIG. 14 is less likely to occur.

However, with such a structure, since the elastoplastic member 5 is housed in the rubber bearing 8 that is the support material of the structure, maintenance or replacement of the 1st elastoplastic member 5 becomes extremely troublesome, and the 2nd part is difficult to maintain or replace. There was a problem in that it was not possible to promptly respond to weakening of the earthquake resistance due to a decrease in the energy absorption performance of the plastic member 5. That is, when the elastoplastic member 5 undergoes plastic deformation and shape repeatedly due to several earthquakes or imaging, the structure of the elastoplastic member 5 changes and the energy absorption capacity decreases. Therefore, it is generally necessary to inspect one elastic-plastic member 5 and replace it if the characteristics are below a predetermined value. If such replacement is not performed, the specified seismic resistance and reliability will not be achieved during the first earthquake.

Significantly affects the safety of the structure. but.

In the structure shown in FIG. 15, since the first elastoplastic member 5 is located within the rubber bearing 8, the characteristics of the first elastoplastic member 5 cannot be easily inspected.

For this reason, there was a high possibility that the timing of replacement would be incorrect. In addition, in order to restrain the radial deformation of the elastoplastic member 5 and to allow shear deformation, a spiral coil 10 is wound around the outer circumference of the elastoplastic member 5. When the elastoplastic member 5 is deformed by the relative deformation force due to the relative displacement between the members 1 and 2, the helical coil 10
also undergoes relative deformation between each coil. in this case,
Since the helical coil 10 is continuous, a twisting force will act on the helical coil 10.

Since the helical coil 10 is responsible for the radial deformation force of the elastoplastic member 5 as shown in (E) above, an excessive force consisting of this force and the above-mentioned torsion force is applied to the helical coil 10. This may cause the helical coil 10 to break. If it breaks, the restraining force against radial deformation will be reduced, resulting in the same problem as in the devices shown in FIGS. 10 and 11.

[Object of the Invention] The present invention was made in view of the above circumstances, and its purpose is to maintain the energy absorption function of an elastoplastic member used for energy absorption for a longer period of time. It is an object of the present invention to provide a vibration energy absorbing device that can be easily maintained or replaced.

[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 a vibration energy absorbing device comprising an elastoplastic member having plasticity, the ends of which are inserted and joined into the recesses provided in the first and second end plates, the first and second end plates are provided with an elastoplastic member having plasticity. A first reinforcing member group is inserted into the recess of the second end plate from within the recess of the first end plate, and at least a portion of the elastic-plastic member that is inserted into the recess is inserted into the elastic-plastic member. A second group of reinforcing members embedded across a boundary portion with a blank portion is provided.

〔Effect of the invention〕

When a vibration force that causes a relative displacement between two members is applied, such as during an earthquake, one elastic-plastic member repeatedly undergoes plastic deformation in response to the relative displacement between the two members. When subjected to repeated deformation in this way, a force that causes cracks is generated at the joint between the two elastoplastic members and each end plate, especially at the boundary between the part inserted into the recess and the part not inserted. act. In other words, a force that causes breakage acts on the joint between the elastic-plastic member and the end plate. However, since the first and second reinforcing member groups are embedded in the 0-elastic-plastic member in the above-mentioned relationship, the strength of the above-mentioned boundary portion where the deformation strain is largest among the parts of the 1-elastic-plastic member can be significantly strengthened.

Cracks and breaks can be prevented from occurring in this part.

Also, when an elastoplastic member is subjected to repeated deformation.

A force acts on this elastic-plastic member to form constrictions at both ends and a bulge at the center. However, since the first and second reinforcing member groups are embedded in the one elastic-plastic member in the above relationship, the presence of these reinforcing member groups 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, the bonding strength between the elastoplastic member and the end plate can be significantly increased, and the occurrence of constrictions in the elastoplastic member can be prevented, allowing it to exhibit a stable energy absorption function over a long period of time. be able to.

Also, II! ! Since there is no need to arrange an elastoplastic member in connection with the device, the surface of one elastoplastic member can be left exposed or covered with a cover or antirust treatment film to prevent corrosion. Therefore, it becomes easy to inspect the current state and characteristics of the elastoplastic member after the earthquake has ended, and as a result, this can contribute to errors in the timing of replacement. moreover.

Since it can be installed independently of other devices, such as a load support Vl position such as a rubber bearing, it can also contribute to facilitating the replacement of the device.

[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 that are actually intended for a vibration energy absorbing device 21 according to an actual example of the present invention.
It is a side view of the example installed between 3 rooms.

This imaging energy absorption 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;
25 and an energy absorber 26 inserted between the energy absorbers 25 and 25.

As shown in FIG. 2, the end plates 24,25 are provided with recesses 27 formed by hollowing out the end plates 24,25. In this embodiment, each of these recesses 27 is provided in the form of a through hole. And these recesses 27
A small diameter portion 28 is formed at a position opposite to the first member 22, 23, and after the small diameter portion 28 once widens out in a stepped shape.

It consists of a large-diameter portion 29 that gradually tapers off as it approaches the members 22 and 23.

On the other hand, the energy absorber 26 includes an elastoplastic member 30 formed in a cylindrical shape, for example, from lead, and a plurality of reinforcing member groups 31a, 31b, 3 inserted into the elastoplastic member 30 in the axial direction.
1c. The elastoplastic member 30 is formed in a shape that matches the concave portion 27 of each end plate 24, 25 at both ends thereof, and is formed in a cylindrical shape having a diameter equal to the diameter of the small diameter portion 28 at the center portion. Both end portions of 9 are inserted and joined into recesses 27 of each end plate 24, 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 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. The reinforcing member groups 31a, 31b, 31
In this embodiment, the reinforcing members 32, 33, and 34 that make up part c are made of iron, which has a higher tensile strength than the lead that makes up the first elastic-plastic member 30, and does not have a large effect on the rigidity of the structure. A material having a thickness that can resist radial deformation of the elastic-plastic member 30 to a certain degree is used. The reinforcing members 32 constituting the reinforcing member group 31a are one elastic-plastic member 30
The same length as, that is, both ends are the recesses 2 of each end plate 24.25.
7, and as shown in FIGS. 3 and 4, they are embedded at equal intervals in the circumferential direction at positions closer to the outside of the elastic-plastic member 30. Further, the reinforcing members 33 constituting the reinforcing member group 31b are formed to have a length approximately twice the thickness of the end plate 24, and are placed on one end side inside the position where the reinforcing member group 31a is embedded. are located in the recess 27 of the end plate 24, and the other end is located between the end plates 24° and 25, and are embedded at equal intervals in the circumferential direction as shown in FIG. The reinforcing members 34 constituting the reinforcing member group 31G are also formed to have a length approximately twice the thickness of the end plate 25, and one end is placed inside the position where the reinforcing member group 31a is embedded. Recessed portion 2 of plate 25
7 and the other end side is located between the end plates 24 and 25.

As shown in FIG. 3, 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 2 elastoplastic member 30 repeatedly undergoes deformation as shown in FIG. For this reason, energy consumption necessary for plastic deformation occurs within one elastic-plastic member 30, and one function as a vibration energy absorbing device is exhibited by this energy consumption.

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

The joint between the elastic-plastic member 30 and the end plate 24.25.

In particular, the boundary R with the recess 27 at both ends of the elastic-plastic member 30
A force is applied that causes a crack to occur.

However, at both ends of the first elastic-plastic member 30, a group of reinforcing members is provided at the boundary R between the part inserted into the recess 27 of each end plate 24, 25 and the part not inserted. 31a, 31b.

31G is embedded. Therefore, the strength of the boundary portion R, which has the largest deformation strain, can be made much larger than that of the conventional structure, and as a result, the occurrence of cracks in the boundary portion R can be prevented. Also.

Even if a constriction or a bulge is generated in the elastic-plastic member 30 due to repeated deformation, this generated force is applied to the reinforcing member group 31a and reinforcing member group 31b embedded over the entire length in the axial direction.
, suppressed by 31C.

As a result, the occurrence of constrictions and bulges is also suppressed. In this way, the mechanical strength of the joint between the elastic-plastic member 30 and each end plate 24, 25 can be significantly increased, and the occurrence of constrictions and bulges can be prevented, so that it can be used for a long period of time. It can exhibit stable energy absorption function. Furthermore, with the above configuration, there is no need to provide the two elastic-plastic members 30 in association with other devices. Therefore, the surface of the elastic-plastic member 30 can 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 elastic-plastic member 30 after the earthquake, and as a result,
This can also contribute to preventing errors in replacement timing. 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. For example, as shown in FIG. 6, inside the reinforcing member u31a, each end plate 24.
A reinforcing member group 31d consisting of a reinforcing member 35 having a length equal to the length connecting the center portions of the recess 27 is embedded, and both ends of the reinforcing member group 31d and the reinforcing member group 31a are embedded.
are connected by connecting members 36a and 36b, and the connecting member 3
6a and 36b may perform a position holding function during casting. Further, as shown in FIG. 7, the reinforcing member group 3
A reinforcing member group 31b is provided on the outside of 1a.

31G may be embedded. Further, as shown in FIG. 8, reinforcing member groups 31a and 31b.

Each reinforcing member 32, 33, 34 constituting 31G may be curved and embedded. Further, a plurality of annular reinforcing members may be inserted in the axial direction to connect the reinforcing members of each reinforcing member group embedded in the axial direction in the circumferential direction. Furthermore, in the embodiment shown in FIG. 1, each end plate 24, 25 is instructed to be fixed to each member 22, 23 with a pole 1-, etc., but as shown in FIG. Supporting recesses 41, 42 are provided respectively, and each end plate 24, 25 is fitted into these recesses 41, 42 to such an extent that no resistance occurs in the axial direction, thereby restraining each end plate 24, 25 only in the direction of relative movement. It may be supported as such. In this way, even if the distance between the members 22 and 23 changes due to, for example, a load, no axial compressive or tensile load will be applied to the energy absorbing device, so the energy absorption characteristics will not be affected. Fluctuations can be absorbed. Furthermore, the shape of the 2 elastic-plastic member is not limited to a cylindrical shape but may be a prismatic shape, and its diameter and length are determined by the total number when this energy absorption device is actually installed, the mass of the target structure, and the rigidity of the structure. , determined by the required energy absorption and the plastic properties of the elastoplastic member used.

In addition, the material for forming the 9 elastic-plastic member is not limited to lead.
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 absorption device is A-A f4ii in Fig. 1.
FIG. 4 is a view of the vibration energy absorbing device taken along line B-B in FIG. 1 and viewed in the direction of the arrow. 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. 8 is a vertical sectional view showing a vibration energy absorbing device according to a further different embodiment of the present invention, FIG. 9 is a diagram for explaining another example of the installation form of the vibration energy absorbing device, FIG. 10 and 11 is a vertical cross-sectional view of a conventional vibration energy absorbing device, FIGS. 12 to 14 are diagrams for explaining the problems of the conventional device, and FIG. 15 is a further diagram of a conventional imaging energy absorbing device. FIG. 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...Recess, 30...
- Elastoplastic members, 31a, 31b, 31c, 31d...
Reinforcement member group, 32.33.34.35...Reinforcement member. Applicant's agent Patent attorney Takehiko Suzue 1a II 3 Figure 1a II4 Figure 115rlA I 10 factors 11 Figure, 5% 13 Ward 14 Diagram 15 Figure

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, a first reinforcing member group embedded in the elastic-plastic member from a position inside the recess of the first end plate to a position inside the recess of the second end plate; A vibration energy absorber comprising a second reinforcing member group embedded in the plastic member at least across the boundary between the part inserted into the recess and the part not inserted. Device. (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 first and second reinforcing member groups are each composed of a plurality of reinforcing members made of a material having higher material strength than the elastic-plastic member. Vibration energy absorbing device as described in . (4) The vibration energy absorbing device according to claim 1, wherein the plurality of reinforcing members constituting the first and second reinforcing member groups are arranged in the circumferential direction. .