JP6842626B2 - Elastoplastic history type damper - Google Patents

Description

The present invention is installed between a superstructure and a substructure in a building, a bridge, etc., and functions as a stopper that restrains the displacement of the superstructure at all times or in the event of an earthquake up to a predetermined level, and is above a predetermined level. It relates to an elasto-plastic history type damper that functions as a damper by shear-plastic deformation in response to the earthquake.

The following Patent Documents 1-3 describe a shear panel type damper using low yield point steel used for a bridge bearing structure. This sheared panel type damper is fixedly installed on the substructure between the superstructure and the substructure in buildings, bridges, etc., and restrains the displacement of the superstructure at all times or in the event of an earthquake up to a predetermined level. It functions as a stopper, and functions as a damper by shear plastic deformation in the event of an earthquake above a predetermined level. Specifically, this shear panel type damper reduces vibration during an earthquake by utilizing the historical attenuation of the sheared portion when shear deformation occurs with respect to horizontal displacement.

Japanese Patent No. 3755886 Japanese Patent No. 4192225 JP-A-2007-198002

However, the shear panel type dampers of any patent document have only one shearing portion, and function as a damper only against a horizontal force from one direction against an earthquake of a predetermined level or higher. Therefore, for example, when a shear panel type damper is installed so as to function as a damper with respect to a horizontal force in the bridge axis direction, if a horizontal force is applied from a direction other than the bridge axis direction, the shear panel type damper inputs. The horizontal force that was present cannot be sufficiently dampened. It is difficult to predict from which direction a horizontal force of a predetermined level or higher is input in the event of an earthquake.

Further, when installing the shear panel type damper, it is necessary to set the installation angle so as to match the shear deformation direction of the damper with high accuracy with respect to the assumed input direction.

An object of the present invention is to provide an elasto-plastic history type damper that can function as a damper for inputs from a plurality of directions in the event of an earthquake of a predetermined level or higher.

The elasto-plastic history type damper according to the present invention is an elasto-plastic history type damper that can be applied to a building and / or a building and is installed in a direction that functions with respect to an assumed input direction, and the directions of each other are different. Two different shearing portions are provided in a series via a connecting portion forming an end portion of the damper, and the space surrounding the damper is a series of spaces between the two shearing portions, which is assumed as described above. The shearing portion is installed so that the in-plane direction of the two shearing portions is inclined with respect to the input direction, and the shearing portion is elasto-plastically including the out -of-plane direction when a certain amount or more is input from the outside. deformed to the constitution that the energy absorption.

Further, the elasto-plastic history type damper according to the present invention is characterized in that the distance between the two sheared portions is narrower at the end portion opposite to the connecting portion than at the connecting portion side.
Further, the elasto-plastic history type damper according to the present invention is characterized in that the distance between the two sheared portions is formed so as to gradually widen in an acute angle from the connecting portion side to the opposite end portion. ..
Further, the elasto-plastic history type damper according to the present invention is formed so that the distance between the two sheared portions gradually expands in an obtuse angle or a right angle from the connecting portion side to the opposite end portion. It is a feature.

Further, the elasto-plastic history type damper according to the present invention is characterized in that the sheared portion has a reinforcing portion at an end opposite to the connecting portion.
Further, the elasto-plastic history type damper according to the present invention is characterized in that the reinforcing portion spreads outward in an acute angle with respect to the sheared portion.
Further, the elasto-plastic history type damper according to the present invention is characterized in that the reinforcing portion spreads outward in an obtuse angle or a right angle with respect to the sheared portion.
Further, the elasto-plastic history type damper according to the present invention is characterized in that the reinforcing portion extends outward with respect to the sheared portion via an arcuate corner portion.
Further, the elasto-plastic history type damper according to the present invention is characterized in that the reinforcing portion has a tubular shape.

Further, the elasto-plastic history type damper according to the present invention is characterized in that the reinforcing portion is integrated with or separate from the sheared portion.

Further, the elasto-plastic history type damper according to the present invention is characterized in that the sheared portion and the connecting portion are provided on one or more flat portions having rigidity capable of facing each other.

In the present invention, since the two shearing portions are provided, the shearing portion directly or indirectly abuts on the stopper of the superstructure in the event of an earthquake of a predetermined level or higher, and the shearing portion receives a shearing bullet at the impact of the abutting. It can be damped by plastic deformation. Further, since the two shearing portions are connected by the connecting portion, it is possible to absorb the vibration at the time of a larger earthquake. Further, by making the directions of the two shearing portions different, it is possible to absorb the vibration at the time of an earthquake not only from one direction but also from a plurality of directions.

It is a figure which shows the bridge which uses the elasto-plastic history type damper to which this invention is applied, (A) is a schematic cross-sectional view in the direction of a bridge axis, (B) is a perspective view in the direction perpendicular to the bridge axis. It is a perspective view of the elasto-plastic history type damper to which this invention is applied. It is a figure which shows the state when the elasto-plastic history type damper receives an input of a predetermined level or more from the central axis direction, (A) is a plan view which shows the input direction, and (B) is a perspective view. It is a figure which shows the state when the said elasto-plastic history type damper receives an input of a predetermined level or more from the direction oblique with respect to the central axis direction, (A) is a plan view which shows the input direction, (B). Is a perspective view. It is a figure which shows the horseshoe type elasto-plastic history type damper, (A) is the cross-sectional view of the middle part in the height direction of (B), and (B) is a perspective view. It is a figure which shows the U-shaped elasto-plastic history type damper, (A) is the cross-sectional view of the middle part in the height direction of (B), and (B) is a perspective view. It is a figure which shows the V-shaped elasto-plastic history type damper which the connecting part has an acute angle, (A) is the cross-sectional view of the middle part in the height direction of (B), and (B) is a perspective view. It is a figure which shows the V-shaped elasto-plastic history type damper which the connecting part has an obtuse angle, (A) is the cross-sectional view of the middle part in the height direction of (B), and (B) is a perspective view. It is a figure which shows the example which the reinforcing part formed in the tip part of the sheared part was formed in a cylindrical shape, (A) is a sectional view, (B) is a perspective view. It is a figure which shows the example which the reinforcing part formed in the tip part of the sheared part was formed in the shape of a cross, (A) is a sectional view, (B) is a perspective view. (A)-(E) are further modified examples of the reinforcing portion formed at the tip portion of the sheared portion. It is a figure which shows the right-angled connecting part, (A) is a sectional view, (B) is a perspective view. It is a figure which provided the reinforcing part on the outside of the connecting part, (A) is a sectional view, (B) is a perspective view. It is a figure which provided the reinforcing part inside the connecting part, (A) is a sectional view, (B) is a perspective view. It is the figure which separated the base end part of the sheared part and connected with the connecting piece, (A) is a sectional view, (B) is a perspective view. It is the figure which made the connecting part into a cylindrical shape, (A) is a sectional view, (B) is a perspective view. It is a figure which provided two reinforcing pieces on the outside of the connecting part, (A) is a sectional view, (B) is a perspective view. It is a figure which shows the connecting part forming a rectangular shape, (A) is a sectional view, (B) is a perspective view. It is the figure which separated the base end part of the sheared part and connected with the connecting piece, (A) is a sectional view, (B) is a perspective view. It is the figure which formed the reinforcing part in the sheared part of the horseshoe type elasto-plastic history type damper, (A) is a cross-sectional view, (B) is a perspective view. It is the figure which formed the reinforcing part in the sheared part of the Π type elasto-plastic history type damper, (A) is a cross-sectional view, (B) is a perspective view. It is a figure which formed the reinforcing part in the sheared part of the V-shaped elasto-plastic history type damper with an acute angle of connection part, (A) is a cross-sectional view, and (B) is a perspective view. It is a figure which shows the elasto-plastic history type damper which made the connecting part obtuse angle, and also the angle formed by a shearing part and a reinforcing part is an obtuse angle, (A) is a sectional view, and (B) is a perspective view. .. It is a figure which shows the elasto-plastic history type damper which made the connecting part cylindrical, and also provided the cylindrical reinforcing part at the tip part of a shearing part, (A) is a sectional view, (B) is a perspective view. is there. It is a figure which shows the example which formed the concave hole part which penetrated through a sheared part, (A) is a side view, (B) is a front view. It is a figure which shows the example which formed the slit-shaped hole part which penetrated through a sheared part, (A) is a side view, (B) is a front view. It is a figure which shows the example which formed the hole part through the corner part of the sheared part, (A) is a side view, (B) is a front view. It is a figure which shows the example which formed the hole part which penetrated in the central part of a sheared part, (A) is a side view, (B) is a front view. It is a figure which shows the example which formed the plurality of through hole part in the whole of the sheared part, (A) is a side view, (B) is a front view. It is a figure which shows the elasto-plastic history type damper which arranged two shearing parts in an acute angle C shape without providing a connecting part, and provided both ends of the shearing part in a T shape by a reinforcing part (A). ) Is a cross-sectional view, and (B) is a perspective view. It is a cross-sectional view which shows the elasto-plastic history type damper which arranged the two shearing portions in an obtuse angle C shape without providing a connecting portion, and provided both ends of the shearing portions in a T shape by a reinforcing portion. It is a cross-sectional view which shows the elasto-plastic history type damper which arranged two shearing parts in a T shape without providing a connecting part, and provided both ends of the shearing part in a T shape by a reinforcing part. It is a cross-sectional view which shows the elasto-plastic history type damper which provided two shearing portions substantially parallel and provided both ends of the shearing portions in a T shape by a reinforcing part without providing a connecting part. It is a cross-sectional view which shows the elasto-plastic history type damper which provided the two shearing portions in a horseshoe shape without providing a connecting portion, and provided both ends of the shearing portions in a T shape by a reinforcing portion. It is a cross-sectional view showing an elasto-plastic history type damper in which two shearing portions are arranged in a U shape without providing a connecting portion and both ends of the shearing portion are provided in a T shape by a reinforcing portion. It is a cross-sectional view which shows the elasto-plastic history type damper which arranged the two shearing parts in an acute angle or obtuse angle C shape without providing a connecting part, and provided each shearing part in a crank shape by a reinforcing part. It is a cross-sectional view which shows the elasto-plastic history type damper which arranged two shearing parts substantially parallel and provided each shearing part in a crank shape by a reinforcing part without providing a connecting part. It is a cross-sectional view which shows the elasto-plastic history type damper which arranged two shearing part in an acute angle or obtuse angle C shape without providing a connecting part, and each shearing part was provided in a U shape by a reinforcing part. It is a cross-sectional view which shows the elasto-plastic history type damper which arranged two shearing parts substantially parallel and provided each shearing part in a U shape by a reinforcing part without providing a connecting part. Cross-sectional view showing an elasto-plastic history type damper in which one shearing part is fixed between the first base plate and the first plate and the other shearing part is fixed between the second base plate and the second plate. (A) is provided so that the longitudinal direction of one sheared portion is different from the longitudinal direction of the first base plate, and the longitudinal direction of the other sheared portion is the longitudinal direction of the second base plate or the second plate. It is a cross-sectional view provided so as to be different from the above, and (B) is a cross-sectional view provided so as to substantially match. (A) is a cross-sectional view showing an elasto-plastic history type damper in which a first base plate and a second base plate are fixed to a base plate, and a first plate and a second plate are fixed to the plate. A cross section provided so that the longitudinal direction of one sheared portion is different from the longitudinal direction of the first base plate and the longitudinal direction of the other sheared portion is different from the longitudinal direction of the second base plate or the second plate. It is a figure, (B) is a cross-sectional view provided so as to substantially coincide with each other. It is a figure which shows the installation example of the elasto-plastic history type damper, (A) is a side view, (B) is a perspective view.

Hereinafter, the elasto-plastic history type damper according to the present invention will be described with reference to the drawings. Hereinafter, the elasto-plastic history type damper will be described in the following order.

1. 1. Explanation of the bridge 2. Explanation of elasto-plastic history type damper 3. Explanation of deformation example 1 of elasto-plastic history type damper (horseshoe shape)
4. Explanation of deformation example 2 of elasto-plastic history type damper (U-shaped)
5. Explanation of deformation example 3 of elasto-plastic history type damper (acute angle V-shaped)
6. Explanation of deformation example 4 of elasto-plastic history type damper (obtuse angle V shape)
7. Description of deformation example 5 of elasto-plastic history type damper (deformation example of reinforcing part at the tip of shearing part)
8. Description of deformation example 6 of elasto-plastic history type damper (deformation example of connecting part)
9. Explanation of a specific configuration example of the elasto-plastic history type damper 10. Description of a modified example in which a hole portion penetrating the sheared portion and / or a slit is provided 11. Description of deformation example 7 of elasto-plastic history type damper (omission of connecting part)
12. Explanation of installation example of elasto-plastic history type damper

[1. Description of the bridge]
As shown in FIGS. 1A and 1B, generally, a superstructure 1 such as a bridge girder is supported by a bearing device 3 installed on a substructure 2 such as a pier or an abutment. As shown in FIG. 1, the bearing device 3 generally includes a fixed bearing device 3a and a movable bearing device 3b, and the fixed bearing device 3a generally applies a vertical load in response to rotational deformation of the superstructure 1. While supporting, constrain and limit horizontal and vertical displacement. The movable bearing device 3b generally corresponds to rotational deformation and horizontal displacement of the superstructure. By the way, in the newly constructed bridge, the seismic performance of the substructure 2 such as the pier is improved, and the reaction force distribution structure and the seismic isolation structure are adopted. Seismic retrofitting work is also being carried out on existing bridges, such as reinforcement of the substructure 2, replacement of bearings, and addition of a bridge collapse prevention system.

For example, in seismic reinforcement work, for example, in order to disperse the horizontal reaction force of the substructure 2, the fixed bearing device 3a is replaced with a movable bearing device 3b such as a laminated rubber bearing or a metal bearing such as a bearing plate bearing or a roller bearing. Work is done. However, when the fixed bearing device 3a is replaced with the movable bearing device 3b, problems such as an increase in the amount of movement of the superstructure 1 occur, and it is necessary to limit the amount of movement. The elasto-plastic history type damper 10 according to the present invention is installed between the superstructure 1 and the substructure 2 in a building, a bridge, or the like in combination with the movable bearing device 3b, for example, and is installed between the superstructure 1 and the substructure 2. The amount of movement of the superstructure 1 with respect to the above is limited.

For example, the girder serving as the superstructure 1 has a pair of main girders 1a and 1a and a horizontal girder 1b. Then, in the existing bridge, when the substructure load capacity of the fixed bearing device 3a is insufficient, the superstructure until then is between the lower flange 4 of the main girders 1a and 1a and the pier which is the substructure 2. A movable bearing device 3b is installed in place of the fixed bearing device 3a that was installed to support the vertical load of 1. At this time, the elasto-plastic history type damper 10 is installed in the substructure 2 in combination with the movable bearing device 3b. When the elasto-plastic history type damper 10 is installed mainly for a horizontal force of a predetermined level or higher in the bridge axis direction, the elasto-plastic history type damper 10 is surrounded by stoppers 16 and 16 provided on the cross girder 1b of the superstructure 1. It is installed in the substructure 2. As a result, the elasto-plastic history type damper 10 can reduce the horizontal force above a predetermined level due to its large damping performance, and can suppress the horizontal displacement to be smaller than the elastic support of only the rubber bearing or the seismic isolation bearing due to its high rigidity. As a result, the elasto-plastic history type damper 10 can reduce the substructure 2 and the substructure seismic reinforcement. In addition, the smaller the horizontal displacement makes it possible to reduce the gap between the girders, and the shape of the telescopic device and the like can also be reduced.

Although details will be described later, the elasto-plastic history type damper 10 does not necessarily have to be used in combination with the movable bearing device 3b. Further, it can be applied not only to a girder type bridge as shown in FIG. 1, but also to an end fulcrum of a bridge having a special structure such as an arch bridge or a truss bridge, an end portion or an intermediate portion of a brace material, and the like.

[2. Explanation of elasto-plastic history type damper]
As shown in FIG. 2, the elasto-plastic history type damper 10 to which the present invention is applied is formed so that the two shearing portions 11 and 11 are connected by the connecting portion 12 to form a series as a whole. In such an elasto-plastic history type damper 10, the shearing portions 11 and 11 are richer in ductility than general structural steel materials and have upper and lower limit standard values with respect to the yield point, so that they are for structures with excellent performance stability. Low yield point steel, which is a steel material, can be used. Further, since the elasto-plastic history type damper 10 absorbs the seismic energy by the plastic strain energy, it is surely plasticized at the time of an earthquake, the variation of the history behavior is small, and the allowable range of the yield point is narrow. Is preferable.

The sheared portions 11 and 11 formed of low yield point steel have, for example, a rectangular plate shape and a flat shape. Then, one end portion is fixed to the flat plate-shaped connecting portion 12 by welding or the like. The connecting portion 12 can also be made of low yield point steel. Further, the sheared portions 11 and 11 and the connecting portion 12 may be formed by bending a series of low yield point steel sheets. The other ends of the sheared portions 11 and 11 are formed by bending the reinforcing portions 13 and 13 via corner portions so as to widen the ends of the sheared portions 11 and 11 outward. Of course, the reinforcing portions 13 and 13 may be welded to the sheared portions 11 and 11. The reinforcing portions 13 and 13 are bent outward by approximately 90 degrees here, but if they extend outward with respect to the sheared portions 11 and 11, even if the angle formed with the sheared portions 11 and 11 is an acute angle. It may be an acute angle. In this way, the two shearing portions 11 and 11 integrated with the flat plate-shaped connecting portion 12 gradually spread from the connecting portion 12 side toward the reinforcing portions 13 and 13 to form a substantially V shape. Here, the intersections of the extension lines of the sheared portions 11 and 11 are formed so as to have an acute angle. The shearing portion 11 and the connecting portion 12 are not limited to using low yield point steel, and general structural steel or the like may be used.

The integrated shearing portions 11 and 11 and the connecting portion 12 are fixed to the base plate 14 which is the base of the attachment portion to the lower structure 2 by welding or the like. The base plate 14 is a steel plate larger than the integrated shearing portions 11 and 11 and the connecting portion 12, and has a rectangular shape. Then, the integrated shearing portions 11 and 11 and the connecting portion 12 forming a substantially V shape are fixed at positions where the center line in the width direction of the base plate 14 and the center line between the shearing portions 11 and 11 substantially coincide with each other. .. Further, the base plate 14 is fixed to the lower structure 2 with anchor bolts or the like.

Further, a plate 15 is also provided on the opposite side of the base plate 14 with the integrated shearing portions 11 and 11 and the connecting portion 12 interposed therebetween, and the plate 15 is provided with the integrated shearing portions 11 and 11 and the connecting portion 12. Is fixed by welding or the like. The plate 15 is located on the superstructure 1 side, and may be similar to or different from the base plate 14. Here, the same base plate 14 is used. Then, the integrated shearing portions 11 and 11 and the connecting portion 12 are fixed to the plate 15 at a position where the center line between the shearing portions 11 and 11 and the center line in the width direction of the plate 15 substantially coincide with each other. The short side end faces of the plate 15, that is, the end faces 15a and 15a parallel to the direction perpendicular to the bridge axis are the portions that abut the stopper of the superstructure 1.

On the other hand, on the superstructure 1 side, stoppers 16 and 16 are provided on the cross girder 1b of the superstructure 1 as shown in FIGS. 1B and 2. The stoppers 16 and 16 are provided apart from each other in the bridge axis direction, and an elasto-plastic history type damper 10 fixed to the substructure 2 is arranged between the stoppers 16 and 16. The elasto-plastic history type damper 10 is fixed to the substructure 2 with anchor bolts or the like with the center line between the sheared portions 11 and 11 in the direction of the bridge axis. Thus, the elasto-plastic history type damper 10 mainly receives an input of a horizontal force equal to or higher than a predetermined level in the bridge axis direction, and the stoppers 16 and 16 of the superstructure 1 and the end surface 15a parallel to the bridge axis perpendicular direction of the plate 15 , 15a collide with each other, and the impact at the time of the collision is dampened by the shear plastic deformation of the sheared portions 11 and 11 and the connecting portion 12.

Specifically, as shown in FIG. 3 (A), the elasto-plastic history type damper 10 receives an input in the bridge axis direction, as shown in FIG. 3 (B), on the base plate 14 side of the connecting portion 12. The sheared portions 11, 11 and the connecting portion 12 near the corner are plastically deformed to attenuate the vibration. In the case of input in the bridge axis direction, the degree of deformation of the sheared portions 11, 11 and the connecting portion 12 near the corner of the connecting portion 12 on the base plate 14 side will differ depending on the size of the input.

Further, as shown in FIG. 4 (A), when an input of a predetermined level or higher is received from an oblique direction with respect to the bridge axis, as shown in FIG. 11 is largely plastically deformed to attenuate vibration. In the example of FIG. 4, an input is shown from a direction tilted by 10 ° with respect to the bridge axis. The degree of deformation of the sheared portions 11, 11 and the connecting portion 12 near the corner of the connecting portion 12 on the base plate 14 side differs depending on the input angle and the input size.

Since the elasto-plastic history type damper 10 as described above has two shearing portions 11 and 11, it is possible to absorb a larger vibration as compared with the case where there is only one shearing portion. Further, since the shearing portions 11 and 11 are formed so as to open in a V shape, for example, even when the center line between the shearing portions 11 and 11 is installed so as to be in the bridge axis direction, the bridge axis direction Not only the input from, but also the vibration from the diagonal direction with respect to the bridge axis can be attenuated.

Further, the elasto-plastic history type damper 10 has two shearing portions 11 and 11, and can also dampen vibrations from an oblique direction with respect to the center line (bridge axis direction) between the shearing portions 11 and 11. Compared with the case where there is only one shearing part, the allowable range and angle of input are wider and there is a likelihood of input. Therefore, when attaching the elasto-plastic history type damper 10 to the bridge, for example, the shearing parts 11, 11 Vibration can be dampened even if the centerline between them is offset and / or tilted with respect to the bridge axis direction. Therefore, the elasto-plastic history type damper 10 can absorb the installation error and has good workability as compared with the case where the sheared portion is one. Therefore, compared to the case where the elasto-plastic history type damper 10 has one sheared portion, for example, when it is retrofitted to an existing bridge, a girder with an oblique angle, a curved girder, a girder with an oblique angle at a fulcrum, etc. It is effective when used.

Further, since the elasto-plastic history type damper 10 has two shearing portions 11 and 11, the height of the shearing portion 11 can be lowered as compared with the case where there is only one shearing portion. Further, since the height of the sheared portion 11 can be lowered, the bending moment generated at the base portion can be reduced, and the load on the base plate 14, the plate 15, the anchor bolt and the like can be reduced. Therefore, in the elasto-plastic history type damper 10, the thickness of the base plate 14 and the plate 15 can be reduced, and the diameter of the anchor bolt can be reduced. Further, in the elasto-plastic history type damper 10, the height of the sheared portion 11 can be lowered, and the thickness of the base plate 14 and the plate 15 can be reduced, so that the total height can be increased as compared with the case where there is only one sheared portion. It can be lowered. As a result, the elasto-plastic history type damper 10 can be arranged even in a narrow gap such as the superstructure 1 and the substructure 2, and the workability in a narrow portion is good and the workability is good. Further, when, for example, a bracket or the like is arranged on the lower structure 2, it can be provided in the vicinity of the lower structure 2.

In the above example, the installation example of the elasto-plastic history type damper 10 that mainly attenuates the vibration in the bridge axis direction has been described, but the elasto-plastic history type damper 10 is also used to attenuate the vibration in the direction perpendicular to the bridge axis. Can be used. In this case, in the elasto-plastic history type damper 10, the center line between the sheared portions 11 and 11 is in the direction perpendicular to the bridge axis between the stoppers 16 and 16 provided apart from the superstructure 1 in the direction perpendicular to the bridge axis. It is installed like this. As a result, the elasto-plastic history type damper 10 can not only attenuate the vibration in the direction perpendicular to the bridge axis but also the vibration in the direction oblique to the direction perpendicular to the bridge axis. Further, when installing the elasto-plastic history type damper 10, it is possible to give a degree of freedom to the installation angle at which the shear deformation direction of the elasto-plastic history type damper 10 is adjusted with high accuracy with respect to the assumed input direction.

Further, as the elasto-plastic history type damper 10, the base plate 14 and the plate 15 may be omitted. When the base plate 14 is omitted, the shearing portions 11 and 11 integrated with the lower structure 2 and the connecting portion 12 may be fixed. Further, when the plate 15 is omitted, the tips of the shearing portions 11 and 11 and the reinforcing portions 13 and 13 may directly abut on the stoppers 16 and 16. By doing so, it is possible to reduce the number of parts of the elasto-plastic history type damper 10. Of course, it is preferable to use the base plate 14 and the plate 15 in terms of improving the stability of performance.

[3. Explanation of deformation example 1 of elasto-plastic history type damper (horseshoe shape)]
In the example shown in FIG. 2-FIG. 4, the case where the sheared portions 11 and 11 and the connecting portion 12 form a V shape has been described, but as shown in FIG. 5, the elasto-plastic history type damper 10 has the sheared portion 11 , 11 and the connecting portion 12 have a horseshoe shape, and the same effect can be obtained. That is, in the example of FIG. 5, the distance between the sheared portions 11 and 11 is formed to be shorter than that on the connecting portion 12 side, and the distance between the ends on the opposite side to the connecting portion 12 is shorter. In this case, the two shearing portions 11 and 11 may have a flat plate shape or a curved plate shape. Further, in this example, one low yield point steel plate may be bent to form a horseshoe shape. In the case of bending, it is not necessary to weld the sheared portions 11 and 11 and the connecting portion 12, and the production efficiency can be improved. Further, although the connecting portion 12 is curved here, it may have a flat plate shape as shown in FIGS. 2 to 4.

[4. Explanation of deformation example 2 of elasto-plastic history type damper (U-shaped)]
As shown in FIGS. 6A and 6B, the elasto-plastic history type damper 10 can obtain the same effect even if the shearing portions 11 and 11 and the connecting portion 12 are U-shaped. .. That is, in the examples of FIGS. 6A and 6B, the distance between the two shearing portions 11 and 11 is constant, and the connecting portion 12 is formed to be curved. In particular, in the case of a U-shape, since two shearing portions 11 and 11 are provided, it is possible to absorb a larger vibration. Further, even if the input is oblique to the bridge axis direction, the shearing portions 11 and 11 and the connecting portion 12 can attenuate the input. Of course, the connecting portion 12 may have a flat plate shape. Even in the examples of FIGS. 6A and 6B, the U-shaped shearing portions 11 and 11 and the connecting portion 12 can be formed by bending.
[5. Explanation of deformation example 3 of elasto-plastic history type damper (acute angle V-shaped)]

As shown in FIGS. 7A and 7B, the elasto-plastic history type damper 10 is formed in a substantially V shape as a whole, and the same effect can be obtained even if the connecting portion 12 connecting the shearing portions 11 and 11 has an acute angle. Can be obtained. That is, the sheared portions 11 and 11 are formed so as to gradually expand from the connecting portion 12 toward the tip portion. Even in the example of FIG. 7, the shearing portions 11 and 11 and the connecting portion 12 can be formed by bending. In particular, when the sheared portions 11 and 11 have a substantially V shape, the input from an oblique direction with respect to the bridge axis can be effectively attenuated. In this example, as long as the connecting portion 12 has an acute angle, the sheared portions 11 and 11 may be curved instead of flat.

[6. Explanation of deformation example 4 of elasto-plastic history type damper (obtuse angle V-shaped)]
As shown in FIGS. 8A and 8B, the elasto-plastic history type damper 10 is formed in a substantially V shape as a whole, and the same effect can be obtained even if the connecting portion 12 connecting the shearing portions 11 and 11 has an obtuse angle. Can be obtained. That is, the sheared portions 11 and 11 are formed so as to gradually expand from the connecting portion 12 toward the tip portion. Even in the examples of FIGS. 8A and 8B, the shearing portions 11 and 11 and the connecting portion 12 can be formed by bending. In particular, when the sheared portions 11 and 11 have a substantially V shape, the input from an oblique direction with respect to the bridge axis can be effectively attenuated. Then, by setting the angle of the connecting portion 12, the direction of the input that can be effectively attenuated can be set. In this example, as long as the connecting portion 12 has an obtuse angle, the sheared portions 11 and 11 may be curved instead of flat.

[7. Description of Deformation Example 5 of Elasto-Plastic History Type Damper (Deformation Example of Reinforcing Part at the Tip of Shearing Part)]
By the way, in the elasto-plastic history type damper 10 shown in FIGS. 2 to 4, the case where the reinforcing portions 13 and 13 at the tip portions of the sheared portions 11 and 11 are opened substantially 90 degrees outward has been described. 13 may be cylindrical as shown in FIGS. 9A and 9B. Further, as shown in FIGS. 10A and 10B, the reinforcing portions 13 and 13 may be formed of reinforcing pieces 13a that intersect with the tip portions of the sheared portions 11 and 11 at substantially right angles, and may have a cross shape. In this case, the reinforcing pieces 17 and 17 are welded and joined to the opposing surfaces of the tips of the sheared portions 11 and 11. Of course, the above-mentioned intersections do not necessarily have to be at right angles, so that when the shearing portion is sheared and deformed, the tip portion of the shearing portion can be prevented from undergoing out-of-plane deformation or buckling. It is not particularly limited as long as it is configured.

Further, as shown in FIG. 11A, the reinforcing portions 13 and 13 project from the tip portions of the sheared portions 11 and 11 to both sides in the thickness direction of the sheared portions 11 and 11, so that the reinforcing portions 13 and 13 project from the reinforcing portions 13, The flat plate-shaped reinforcing plates constituting the 13 may be welded and joined so that the tip shape is T-shaped. Further, as shown in FIG. 11B, the reinforcing portions 13 and 13 may be welded and joined so that the flat plate-shaped reinforcing plates project only to the outside so that the tip shape is L-shaped. The reinforcing portions 13 and 13 in FIG. 11B may be formed by bending the tip portions of the sheared portions 11 and 11. Further, as shown in FIG. 11C, the reinforcing plates constituting the reinforcing portions 13 and 13 are welded and joined so as to project outward from the tip portions of the sheared portions 11 and 11 slightly to the base end side. Is also good. Further, as shown in FIG. 11 (D), when the reinforcing portions 13 and 13 are formed so as to project outward, the angle formed by the sheared portions 11 and 11 is shown in FIGS. 11 (A)-( C ). Unlike the case of a right angle, the angle may be sharp. Of course, as a modification of this example, the angle formed by the reinforcing portions 13 and 13 and the sheared portions 11 and 11 can be an obtuse angle. Further, as shown in FIG. 11 (E), the angle formed by the reinforcing portions 13 and 13 and the sheared portions 11 and 11 may be formed by an arc surface.

[8. Explanation of Deformation Example 6 of Elasto-Plastic History Type Damper (Deformation Example of Connecting Part)]
In the elasto-plastic history type damper 10 shown in FIGS. 2 to 4, the connecting portion 12 connecting the shearing portions 11 and 11 is formed in a flat plate shape, as shown in FIGS. 12A and 12B. The connecting portion 12 may be formed at a substantially right angle. That is, the connecting portion 12 may be formed in a flat plate shape or a curved surface, and further formed so as to form an acute angle as shown in FIGS. 7A and 7B. Alternatively, as shown in FIGS. 8A and 8B, it may be formed so as to form an acute angle.

Further, the reinforcing portion 17 may also be formed in the connecting portion 12 connecting the shearing portions 11 and 11. In the examples shown in FIGS. 13A and 13B, a reinforcing piece 17a serving as a reinforcing portion 17 is formed on the outside of the connecting portion 12. In this case, the reinforcing piece 17a may be formed so as to be an extension of the center line between the sheared portions 11 and 11. The reinforcing piece 17a is fixed to, for example, a connecting portion 12 composed of sheared portions 11 and 11 by welding or the like. In this example, the connecting portion 12 connecting the shearing portions 11 and 11 may have an acute angle, a right angle, or an obtuse angle. Further, as shown in FIGS. 14A and 14B, the reinforcing portion 17 may be formed inside the connecting portion 12 so as to bridge the base ends of the two shearing portions 11 and 11. That is, the reinforcing piece 17b is welded and joined so as to bridge the reinforcing piece 17b on the connecting portion 12 side of the two shearing portions 11 and 11.

Further, as shown in FIGS. 15A and 15B, the connecting portion 12 may be connected by the connecting piece 12a by separating the base ends of the shearing portions 11 and 11 from each other. In this case, each end of the connecting piece 12a is welded to the inner surface of each of the sheared portions 11, 11. Further, as shown in FIGS. 16A and 16B, the connecting portion 12 is composed of a cylindrical body 12b, and the base end portions of the sheared portions 11 and 11 are welded to the outer peripheral surface of the cylindrical body 12b. You can do it. Further, as shown in FIGS. 17A and 17B, the connecting portion 12 is formed in a cross shape so that the proximal end portion of one shearing portion 11 and the proximal end portion of the other shearing portion 11 intersect. You may try to do it. In this case, for example, the base end portion of one shearing portion 11a is welded to the base end portion of the other shearing portion 11b. At this time, the base end portion of the other shearing portion 11b is welded and joined slightly inward from the end surface of one shearing portion 11a, and this is used as the connecting portion 12. Then, a reinforcing piece 12d formed at the tip of one shearing portion 11a and having the same length as the reinforcing piece 12c is welded and joined to one shearing portion 11a to be formed on an extension line of the other shearing portion 11. Further, as shown in FIGS. 18A and 18B, the connecting portion 12 forms the connecting portion 12 in a flat plate shape, and the shearing portions 11 and 11 are parallel to each other so that the connecting portion 12 is parallel to each other. 12 may form a rectangular shape. That is, in this case, the integrated shearing portions 11 and 11 and the connecting portion 12 form a rectangular shape. Further, as shown in FIGS. 19A and 19B, the shearing portions 11 and 11 may be welded and joined so as to open outward with the base end portions separated from the flat plate-shaped connecting portion 12. In this case, the outer side of the shearing portions 11 and 11 formed in the connecting portion 12 functions as the reinforcing portions 17 and 17.

[9. Explanation of specific configuration examples of elasto-plastic history type dampers]
In the examples of FIGS. 20 (A) and 20 (B), the horseshoe-shaped elasto-plastic history type damper 10 shown in FIG. As described above, a flat plate-shaped reinforcing plate may be formed as the reinforcing portions 13 and 13 ( see FIG. 11 (C )). In the examples of FIGS. 21A and 21B, the shearing portions 11 and 11 are formed substantially parallel to the flat plate-shaped connecting portion 12, and the intervals are spaced from the base end portion to the tip end portion of the shearing portions 11 and 11. It may be constant. At this time, reinforcing portions 13 and 13 overhanging to the outside may be formed at the tips of the sheared portions 11 and 11 by welding. Of course, the reinforcing portions 13 and 13 may be formed by bending the tip portions of the sheared portions 11 and 11 instead of welding. Further, in the connecting portion 12, the portions protruding outward from the base end portions of the sheared portions 11 and 11 serve as the reinforcing portions 17 and 17. The angle formed by the reinforcing portions 13 and 13 and the sheared portions 11 and 11 may be not only a right angle but also an acute angle or an obtuse angle. In the examples of FIGS. 22A and 22B, the whole is formed in a substantially V shape, the connecting portion 12 connecting the shearing portions 11 and 11 has an acute angle, and the tip portion of the shearing portions 11 and 11 is outwardly formed. Reinforcing portions 13 and 13 are formed so as to overhang. The reinforcing portions 13 and 13 here may be welded and joined, but are formed by bending.

In the examples of FIGS. 23A and 23B, the connecting portion 12 to which the shearing portions 11 and 11 are connected is formed by a curved surface, and the angle of the connecting portion 12 formed by the shearing portions 11 and 11 is obtuse. Further, the reinforcing portions 13 and 13 at the tips of the sheared portions 11 and 11 are formed on the outside so as to form a series of arcuate curved surfaces with respect to the sheared portions 11 and 11. Further, as shown in the examples of FIGS. 24 (A) and 24 (B), in the elasto-plastic history type damper of the present invention, the connecting portion 12 is formed in a cylindrical shape (see FIG. 16), and the sheared portions 11 and 11 are formed. The angle may be obtuse, and cylindrical reinforcing portions 13 and 13 may be formed at the tips of the sheared portions 11 and 11 (see FIG. 9).

[10. Description of a modified example in which a hole and / or a slit is provided in the sheared portion]
Here, a modified example in which the sheared portions 11 and 11 are provided with holes penetrating will be described by taking the elasto-plastic history type damper 10 shown in FIGS. 2 to 4 as an example. When one or a plurality of holes are provided, a similar low yield point can be realized with a normal steel material without using a low yield point steel. Of course, the hole may be formed in the low yield point steel to adjust the yield point and the buckling point.

In the examples of FIGS. 25A and 25B, the two shearing portions 11 and 11 have a joint portion between the shearing portions 11 and 11 and the base plate 14 and / or a side serving as a joint portion between the shearing portion 11 and the plate 15. A plurality of holes 21 having cutouts at the edges are formed intermittently. By forming the hole portion 21 at the joint portion with the base plate 14 and / or the joint portion with the plate 15, the joint portion with the base plate 14 and / or the welded portion with the plate 15 can be reduced. Further, since the sheared portions 11 and 11 are formed with a plurality of holes 21, for example, even if a low yield point steel is not used for the sheared portions 11 and 11, the shearing portions 11 and 11 are sheared like a low yield point steel with a normal steel material. It can be transformed. The shape of the hole 21 may be any shape such as a concave shape or a semicircular shape. Further, the number and size of the holes 21 may be appropriately determined according to the intended use. Further, the hole portion 21 may be formed at a boundary portion between the shearing portions 11 and 11 and the connecting portion 12 and / or the reinforcing portion 13.

26 (A) and 26 (B) are modifications of FIG. 25, and are formed at a joint portion between the sheared portions 11 and 11 and the base plate 14 and / or at a side edge portion serving as a joint portion between the sheared portion 11 and the plate 15. , The slit-shaped hole 22 is formed. Further, the sheared portions 11 and 11 can also form a slit-shaped hole portion 22 at a boundary portion between the connecting portion 12 and the reinforcing portion 13. By such an example of FIG. 26, the joint portion with the base plate 14 and / or the welded portion with the plate 15 can be reduced, and even if low yield point steel is not used for the sheared portions 11 and 11, it is usual. The steel material can be subjected to shear deformation like low yield point steel. The position where the hole 22 is provided is not particularly limited as long as it is provided at at least one of these four locations. For example, the slit-shaped holes 22 may have two vertical holes or two horizontal holes. Further, each slit-shaped hole 22 may have an arcuate shape on both sides in the longitudinal direction.

27 (A) and 27 (B) are also modifications of FIGS. 25 and 26, and are a part of the joint between the sheared portions 11 and 11 and the base plate 14 and / or the jointed portion between the sheared portion 11 and the plate 15. The hole portion 23 is formed in the corner portion. By such an example of FIG. 27, the joint portion with the base plate 14 and / or the welded portion with the plate 15 can be reduced, and even if low yield point steel is not used for the sheared portions 11 and 11, it is usual. The steel material can be subjected to shear deformation like low yield point steel. The position where the hole 23 is provided is not particularly limited as long as it is provided at at least one of these four locations. For example, the upper two may be used, the lower two may be used, the front side may be two, or the back side may be two. Further, the shape of the hole portion 23 is not limited to a fan shape, and may be, for example, a rectangular shape.

In FIGS. 28 (A) and 28 (B), a penetrating hole portion 24 can be formed in a substantially central portion of the sheared portions 11 and 11. According to such an example of FIG. 28, even if low yield point steel is not used for the sheared portions 11 and 11, ordinary steel material can be subjected to shear deformation like low yield point steel. The shape of the hole 24 may be a polygon such as a triangle, a quadrangle, or a pentagon, as well as a circular slit, or a cross-shaped or x-shaped slit.

29 (A) and 29 (B) show through the holes 25 formed in the entire sheared portions 11 and 11. According to the example of FIG. 29 as described above, even if low yield point steel is not used for the sheared portions 11 and 11, ordinary steel material can be subjected to shear deformation like low yield point steel. In particular, when a plurality of hole portions 25 are formed in the entire sheared portions 11 and 11, it is possible to prevent the occurrence of cross cracks due to buckling bending due to shear deformation. The shape of each of the holes 25 may be a polygon such as a triangle, a quadrangle, or a pentagon, or a slit such as a cross or an X, in addition to a circle. It may be a combination.

Further, as shown in FIGS. 25 and 26, holes 21 and 22 are provided at the joint portion between the shear portion 11 and the base plate 14 and / or the side edge portion serving as the joint portion between the shear portion 11 and the plate 15. Above, the hole 24 as shown in FIG. 28 may be provided in the central portion, or as shown in FIG. 29, a plurality of holes 25 may be provided over the entire shearing portions 11 and 11. Is also good.

[11. Description of deformation example 7 of elasto-plastic history type damper (omission of connecting part)]
The elasto-plastic history type damper 10 shown in FIG. 2-FIG. 29 is formed by connecting two shearing portions 11 and 11 with a connecting portion 12 so as to form a series as a whole. As shown, the connecting portion 12 may be omitted so that the base end portions of the sheared portions 11 and 11 are separated from each other.

Specifically, the elasto-plastic history type damper 10 shown in FIG. 30 is provided with two shearing portions 11 and 11, and the distance between the two shearing portions 11 and 11 is from the base end side to the tip end side. It is formed so as to gradually spread in an acute angle. That is, in the elasto-plastic history type damper 10 shown in FIG. 30, two shearing portions 11 and 11 are provided in different directions. Further, the elasto-plastic history type damper 10 shown in FIG. 30 has reinforcing portions 13 and 13 so as to project from the tip and base ends of the shear portions 11 and 11 on both sides of the shear portions 11 and 11 in the thickness direction. The flat plate-shaped reinforcing plates constituting the above are welded and joined so that both ends of the sheared portions 11 and 11 form a T-shape. Further, the elasto-plastic history type damper 10 shown in FIG. 30 is fixed between the base plate 14 and the plate 15 on which the shearing portions 11 and 11 face each other.

Even in the elasto-plastic history type damper 10 shown in FIG. 30 as described above, since the two shearing portions 11 and 11 are provided, a larger vibration can be absorbed. Further, in the elasto-plastic history type damper 10 shown in FIG. 30, since the two shearing portions 11 and 11 are provided in different directions, the shearing portion 11 is provided even when the input is oblique to the bridge axis direction. , 11 can be attenuated.

As shown in FIG. 31, the elasto-plastic history type damper 10 may be formed so that the distance between the two sheared portions 11 and 11 gradually expands in an obtuse angle from the proximal end side to the distal end portion side. .. Further, as shown in FIG. 32, the elasto-plastic history type damper 10 may be formed so that the two shearing portions 11 and 11 are substantially orthogonal to each other to form a T-shape.

Further, as shown in FIG. 33, the elasto-plastic history type damper 10 is not limited to the two shearing portions 11 and 11 being provided in different directions, and is based on the two shearing portions 11 and 11. It may be formed so as to be parallel from the end portion to the tip portion and have a constant spacing.

Further, the elasto-plastic history type damper 10 shown in FIG. 34 is provided with two shearing portions 11 and 11, and the distance between the two shearing portions 11 and 11 is closer to the tip end side than to the base end portion side. Is narrowed, the tip side is curved inward, and the sheared portions 11 and 11 are formed so as to form a horseshoe shape. That is, in the elasto-plastic history type damper 10 shown in FIG. 34, the two shearing portions 11 and 11 are provided in different directions. Further, the elasto-plastic history type damper 10 shown in FIG. 34 has reinforcing portions 13 and 13 so as to project from the tip and base ends of the shear portions 11 and 11 on both sides of the shear portions 11 and 11 in the thickness direction. The flat plate-shaped reinforcing plates constituting the above are welded and joined so that both ends of the sheared portions 11 and 11 form a T-shape. Further, the elasto-plastic history type damper 10 shown in FIG. 34 is fixed between the base plate 14 and the plate 15 on which the shearing portions 11 and 11 face each other.

Even in the elasto-plastic history type damper 10 shown in FIG. 34 as described above, since the two shearing portions 11 and 11 are provided, a larger vibration can be absorbed. Further, in the elasto-plastic history type damper 10 shown in FIG. 34, since the two shearing portions 11 and 11 are provided in different directions, the shearing portion 11 is provided even when the input is oblique to the bridge axis direction. , 11 can be attenuated.

As shown in FIG. 35, in the elasto-plastic history type damper 10, the two shearing portions 11 and 11 are parallel to each other and have a constant spacing, and the tip end side is curved inward. The sheared portions 11 and 11 may be formed so as to form a U shape.

Further, the elasto-plastic history type damper 10 shown in FIG. 36 is provided with two shearing portions 11 and 11, and the distance between the two shearing portions 11 and 11 is acute from the base end side to the tip end side. Alternatively, it is formed so as to gradually spread in an obtuse angle. That is, in the elasto-plastic history type damper 10 shown in FIG. 36, the two shearing portions 11 and 11 are provided in different directions. Further, in the elasto-plastic history type damper 10 shown in FIG. 36, flat reinforcing plates constituting the reinforcing portions 13b and 13b are welded and joined to the tips of the sheared portions 11 and 11 so as to project only to the outside. , The tip shapes of the sheared portions 11 and 11 are formed so as to form an L shape. Further, in the elasto-plastic history type damper 10 shown in FIG. 36, flat reinforcing plates constituting the reinforcing portions 13c and 13c are welded and joined to the base end portions of the sheared portions 11 and 11 so as to project only inward. Therefore, the base end shapes of the sheared portions 11 and 11 are formed so as to form an L shape. Further, the elasto-plastic history type damper 10 shown in FIG. 36 is fixed between the base plate 14 and the plate 15 on which the shearing portions 11 and 11 face each other.

Even in the elasto-plastic history type damper 10 shown in FIG. 36 as described above, since the two shearing portions 11 and 11 are provided, a larger vibration can be absorbed. Further, in the elasto-plastic history type damper 10 shown in FIG. 36, since the two shearing portions 11 and 11 are provided in different directions, the shearing portion 11 is provided even when the input is oblique to the bridge axis direction. , 11 can be attenuated.

The elasto-plastic history type damper 10 is not limited to the two shearing portions 11 and 11 being provided in different directions, and as shown in FIG. 37, the bases of the two shearing portions 11 and 11. It may be formed so as to be parallel from the end portion to the tip portion and have a constant spacing.

Further, the elasto-plastic history type damper 10 shown in FIG. 38 is provided with two shearing portions 11 and 11, and the distance between the two shearing portions 11 and 11 is acute from the base end side to the tip end side. Alternatively, it is formed so as to gradually spread in an obtuse angle. That is, in the elasto-plastic history type damper 10 shown in FIG. 38, the two shearing portions 11 and 11 are provided in different directions. Further, in the elasto-plastic history type damper 10 shown in FIG. 38, flat reinforcing plates constituting the reinforcing portions 13 and 13 are provided on the tip and base ends of the sheared portions 11 and 11 so as to project only outward. It is welded and joined so that the sheared portions 11 and 11 form a U-shape. Further, the elasto-plastic history type damper 10 shown in FIG. 38 is fixed between the base plate 14 and the plate 15 on which the shearing portions 11 and 11 face each other.

Even in the elasto-plastic history type damper 10 shown in FIG. 38 as described above, since the two shearing portions 11 and 11 are provided, a larger vibration can be absorbed. Further, in the elasto-plastic history type damper 10 shown in FIG. 38, since the two shearing portions 11 and 11 are provided in different directions, the shearing portion 11 is provided even when the input is oblique to the bridge axis direction. , 11 can be attenuated.

The elasto-plastic history type damper 10 is not limited to the two shearing portions 11 and 11 being provided in different directions, and as shown in FIG. 39, the bases of the two shearing portions 11 and 11. It may be formed so as to be parallel from the end portion to the tip portion and have a constant spacing.

The elasto-plastic history type damper 10 shown in FIGS. 30 to 39 is not limited to the shearing portions 11 and 11 being fixed between the same base plate 14 and plate 15, for example, FIG. 40. As shown in (A) and FIG. 40 (B), one shearing portion 11 is fixed between the first base plate 14b and the first plate 15b facing each other, and the other shearing portion 11 faces the second. It may be fixed between the base plate 14c and the second plate 15c.

At this time, as shown in FIG. 40 (A), the longitudinal direction of one shearing portion 11 is provided so as to be different from the longitudinal direction of the first base plate 14b and the first plate 15b, and the longitudinal direction of the other shearing portion 11 is provided. The direction may be different from the longitudinal direction of the second base plate 14c or the second plate 15c, or may be provided so as to substantially coincide with each other as shown in FIG. 40 (B).

Further, as shown in FIGS. 41 (A) and 41 (B), the elasto-plastic history type damper 10 shown in FIGS. 40 (A) and 40 (B) further includes a first base plate 14b and a second base plate 14b. The base plate 14c of the above may be fixed to the base plate 14, and the first plate 15b and the second plate 15c may be fixed to the plate 15.

Further, the elasto-plastic history type damper 10 shown in FIGS. 30 to 41 is limited to the one in which the tip portions and the base end portions of the sheared portions 11 and 11 are formed so as to form a T-shape or an L-shape. Instead, for example, other shapes and formations, as shown in FIGS. 9 (A) and 9 (B), FIGS. 10 (A) and 10 (B), and FIGS. 11 (A) to 11 (E). It may be formed by a method.

[12. Explanation of installation example of elasto-plastic history type damper]
The elasto-plastic history type damper 10 can be used for building steel frames, bridges, railway bridges, etc., in addition to the girder bridges shown in FIGS. 1 and 2. For example, as shown in FIGS. 42 (A) and 42 (B), 51 such as a frame cross beam of a structure or a cross support member of a bridge and one end of a brace member 53 are attached to join members gathered at a node of a steel frame structure. An elasto-plastic history type damper 10 can be attached between the gusset plate 52 and the gusset plate 52 used for the above (damper arrangement location). In this case, the elasto-plastic history type damper 10 can dampen the horizontal force from the direction between the shearing portions 11 and 11 by causing the shearing portions 11 and 11 to undergo shear-plastic deformation.

1 upper structure, 1a main beam, 1b cross beams, 2 lower structure 3 bearing device 3a fixing bearing device, 3b mobile bearing device, 4 the lower flange, 10 Elastoplastic history damper, 11 (11a, 11b) Fractured parts, 12 connecting parts, 12a connecting pieces, 12b cylindrical bodies, 12c reinforcing pieces, 12d reinforcing pieces, 13 reinforcing parts, 13a reinforcing pieces, 13b reinforcing parts, 13c reinforcing parts, 14 base plates, 15 plates, 15a end faces, 16 stoppers. , 17 Reinforcing part, 17a Reinforcing piece, 17b Reinforcing piece, 21-25 hole part, 51 Structure frame Horizontal bearings and bridge horizontal bearings (horizontal frame), 52 gusset plate, 53 brace material, 54 vertical frame

Claims (11)

An elasto-plastic history damper that is applicable to buildings and / or structures and is installed in a functioning direction with respect to the expected input direction.
Two shears that are oriented differently from each other are provided in series via a connecting portion that forms the end of the damper.
The space surrounding the damper is a series of spaces between the two sheared parts.
The shearing portions are installed so that the in-plane directions of the two shearing portions are inclined with respect to the assumed input direction.
The sheared portion is an elasto-plastic history type damper characterized in that it is elasto-plastically deformed in a direction including an out -of-plane direction to absorb energy when a certain amount or more is input from the outside. The elasto-plastic history type damper according to claim 1, wherein the distance between the two sheared portions is narrower at the end portion on the side opposite to the connecting portion than on the connecting portion side. The elasto-plastic history type damper according to claim 1, wherein the distance between the two sheared portions is formed so as to gradually widen in an acute angle from the connecting portion side to the opposite end portion. The elasto-plastic history according to claim 1, wherein the distance between the two sheared portions is formed so as to gradually expand in an obtuse angle or a right angle from the connecting portion side to the opposite end portion. Type damper. The elasto-plastic history type damper according to any one of claims 1-4, wherein the sheared portion has a reinforcing portion at an end opposite to the connecting portion. The elasto-plastic history type damper according to claim 5, wherein the reinforcing portion extends outward in an acute angle with respect to the sheared portion. The elasto-plastic history type damper according to claim 5, wherein the reinforcing portion extends outward in an obtuse angle or a right angle with respect to the sheared portion. The elasto-plastic history type damper according to claim 5, wherein the reinforcing portion extends outward with respect to the sheared portion via an arcuate corner portion. The elasto-plastic history type damper according to claim 5, wherein the reinforcing portion has a tubular shape. The elasto-plastic history type damper according to any one of claims 5-9, wherein the reinforcing portion is integrally or separately from the sheared portion. The elasto-plastic history type damper according to any one of claims 1-10, wherein the shearing portion and the connecting portion are provided on one or more flat portions having rigidity capable of facing each other.

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