JP2021152390A - Damping device - Google Patents

Abstract

To provide a holding structure for a plate material for efficiently absorbing vibration energy.SOLUTION: A damping device according to an embodiment of the present invention comprises: a first plate part including a deformation region, a first holding region provided at one end part of the deformation region, and a second holding region provided at the other end part of the deformation region, and in which the first holding region and the second holding region have lower yield shear force than that of the deformation region; a second plate part arranged on the side of a first surface of the first plate part; a first fixing part for fixing the second plate part in such a manner that it is rotatable with respect to the first plate part in the first holding region; and a second fixing part for fixing the second plate part in such a manner that it is rotatable with respect to the first plate part in the second holding region.SELECTED DRAWING: Figure 2

Description

The present invention relates to a vibration damping device.

Vibration damping devices in buildings suppress vibration by absorbing vibration energy by various methods. For example, in Patent Documents 1 and 2, a plate material of low yield point steel (hereinafter, may be referred to as a low yield point steel plate) is used, and the shearing force generated by vibration absorbs vibration energy by plastically deforming this plate material. The vibration damping device is disclosed.

Japanese Patent No. 3397220 Japanese Unexamined Patent Publication No. 2001-234974

Each vibration damping device includes a low yield point steel sheet and a structure for holding the low yield point steel sheet, but it is desired to develop a holding structure for more efficiently absorbing vibration energy in the low yield point steel sheet. There is.

One of an object of the present invention is to provide a holding structure for a plate material for efficiently absorbing vibration energy.

According to one embodiment of the present invention, a first plate portion including a deformation region, a first holding region provided at one end of the deformation region, and a second holding region provided at the other end of the deformation region. The first holding region and the second holding region have a yield shear force lower than that of the deformed region, and a second plate portion is arranged on the first surface side of the first plate portion. The plate portion, the first fixing portion that rotatably fixes the second plate portion to the first plate portion in the first holding region, and the second plate portion in the second holding region. Provided is a vibration damping device including a second fixing portion that is rotatably fixed to the first plate portion.

A third plate portion arranged on the second surface side opposite to the first surface side of the first plate portion is further provided, and the first fixing portion is the second plate portion in the first holding region. And the third plate portion are fixed to the first plate portion in a rotatable state, and the second fixing portion is formed with the second plate portion and the third plate portion in the second holding region. May be fixed to the first plate portion in a rotatable state.

A plurality of the second plate portions may be arranged on the first surface side of the first plate portion.

According to one embodiment of the present invention, a first plate portion including a deformation region, a first holding region provided at one end of the deformation region, and a second holding region provided at the other end of the deformation region. The first holding region and the second holding region are arranged on the first plate portion having a yield shear force lower than that of the deformed region and on the first surface side of the first plate portion, and are arranged in one direction. A second plate portion including a slit extending to, a first fixing portion for fixing the second plate portion to the first plate portion in the first holding region, and a second plate portion for fixing the second plate portion to the second holding region. Provided is a vibration damping device including a second fixing portion fixed to the first plate portion.

A third plate portion which is arranged on the second surface side of the first plate portion opposite to the first surface side and includes a slit extending in one direction is further provided, and the first fixing portion is the first holding region. The second plate portion and the third plate portion are fixed to the first plate portion, and the second fixing portion is formed by the second plate portion and the third plate portion in the second holding region. May be fixed to the first plate portion.

The slit may extend along a first direction connecting the first fixing portion and the second fixing portion.

In the first holding region, the first plate portion can be fixed to the structure of the building on the side opposite to the deformed region with respect to the first region in which the first fixing portion is arranged and the first region. The second holding region includes a second region covered with a splice plate, and the second holding region is the third region on which the second fixing portion is arranged, and the third region on the side opposite to the deformation region with respect to the third region. One plate portion may include a fourth region covered with a splice plate that can be fixed to the structure of the building.

The first holding region and the second holding region may have a larger cross-sectional area of a surface having a normal in the first direction connecting the first fixed portion and the second fixed portion than the deformed region. ..

The cross-sectional area of the deformed region may gradually change on the side of the first holding region.

An auxiliary plate arranged between the second plate portion and the first plate portion may be further provided.

The second plate portion may include ribs protruding from a surface opposite to the first plate portion.

The rib may be arranged so as to extend in a second direction perpendicular to the first direction connecting the first fixing portion and the second fixing portion.

According to the present invention, it is possible to provide a holding structure of a plate material for efficiently absorbing vibration energy.

It is a figure which shows the arrangement example of the vibration damping device in 1st Embodiment of this invention. It is a figure for demonstrating the structure of the vibration damping device in 1st Embodiment of this invention. It is a schematic diagram for demonstrating the cross section at the A1-A2 cutting line in FIG. It is a figure which shows the movement of the vibration damping device in the 1st Embodiment of this invention. It is a figure for demonstrating the structure of the vibration damping device in the 2nd Embodiment of this invention. It is a figure for demonstrating the structure of the vibration damping device in 3rd Embodiment of this invention. It is a figure for demonstrating the structure of the vibration damping device in 4th Embodiment of this invention. It is a figure for demonstrating the structure of the vibration damping device in 5th Embodiment of this invention. It is a figure for demonstrating the structure of the vibration damping device in the 6th Embodiment of this invention. It is a schematic diagram for demonstrating the cross section at the B1-B2 cutting line in FIG. It is a figure for demonstrating the structure of the vibration damping device in 7th Embodiment of this invention. It is a figure for demonstrating the structure of the vibration damping device in 8th Embodiment of this invention. It is a schematic diagram for demonstrating the cross section at the C1-C2 cutting line in FIG. It is a figure which shows the movement of the vibration damping device in 8th Embodiment of this invention. It is a figure for demonstrating the structure of the vibration damping device in the 9th Embodiment of this invention. It is a schematic diagram for demonstrating the cross section at the D1-D2 cutting line in FIG. It is a figure for demonstrating the structure of the vibration damping device in the tenth embodiment of this invention. It is a figure for demonstrating the structure of the vibration damping device in 11th Embodiment of this invention. It is a schematic diagram for demonstrating the cross section at the E1-E2 cutting line in FIG.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. The embodiments shown below are examples of embodiments of the present invention, and the present invention is not construed as being limited to these embodiments. In the drawings referred to in the present embodiment, the same part or a part having a similar function is given the same code or a similar code (a code in which A, B, etc. are simply added after the numbers), and the process is repeated. The explanation of may be omitted.

<First Embodiment>
[Overview]
FIG. 1 is a diagram showing an arrangement example of a vibration damping device according to the first embodiment of the present invention. The vibration damping device 1 in the first embodiment includes a holding structure of a low yield point steel plate 10 (first plate portion) for efficiently absorbing vibration energy, and is divided into upper and lower parts constituting the structure of the building. It is arranged between the studs 90u and 90b. In this example, the stud 90u is H-section steel and includes the web 95u and the flanges 92u, 94u connected to both ends of the web 95u. The stud 90b is H-section steel and includes a web 95b and flanges 92b, 94b connected to both ends of the web 95b. The studs 90u and 90b are arranged so that their longitudinal directions are along the vertical direction. The low yield point steel sheet 10 is an example of a plate material that serves as a damper for absorbing vibration energy, and as described below, as long as it is a plate material having a yield shear force lower than that of the web 95, various alloys, steels, and the like are used. The structure and material can be changed.

Hereinafter, for convenience of explanation, the x, y, and z axes are defined as the spatial directions as follows. The x-axis direction (first direction) corresponds to the longitudinal direction of the studs 90u and 90b, that is, the direction in which the flanges 92u, 94u, 92b and 94b extend in the in-plane direction of the web 95, and in this example, the vertical direction. Is. The y-axis direction (second direction) corresponds to the in-plane direction of the webs 95u and 95b, which is perpendicular to the x direction. The z-axis direction (third direction) corresponds to the direction perpendicular to the x-axis direction and the y-axis direction, that is, the normal direction of the webs 95u and 95b. It should be noted that both the x-axis direction and the y-axis direction, which is the best z-axis direction, mean the direction along the axial direction, and do not indicate the positive direction (the direction of the arrow in the drawing), but the positive direction and the negative direction. Both shall be indicated. That is, the x-axis direction means the vertical direction in FIG.

The vibration damping device 1 includes a low yield point steel plate 10 and a restraint portion 20. The low yield point steel plate 10 is a plate-shaped member including a surface extending in the x-axis direction and the y-axis direction, and is arranged between the web 95u and the web 95b at a distance from the webs 95u and 95b. The upper fixing portion 70 is connected to the upper end portion of the low yield point steel plate 10 and the web 95u. The lower fixing portion 75 is connected to the lower end portion of the low yield point steel plate 10 and the web 95b. The position of the low yield point steel plate 10 with respect to the webs 95u and 95b is fixed by both the upper fixing portion 70 and the lower fixing portion 75. As a result, the low yield point steel plate 10 is held by the webs 95u and 95b.

The restraint portion 20 is lowered by the first fixing portion 40 and the second fixing portion 50 so as to limit the deformation of the low yield point steel plate 10 in the z-axis direction by sandwiching the low yield point steel plate 10 between the two plate materials. It is fixed to the yield point steel plate 10. At this time, the first fixing portion 40 fixes the restraining portion 20 to the low yield point steel plate 10 in a rotatable state in the xy plane. The second fixing portion 50 fixes the restraining portion 20 to the low yield point steel plate 10 in a rotatable state in the xy plane. In other words, the low yield point steel sheet 10 is in a state where the buckling (deformation in the z-axis direction) of the low yield point steel sheet 10 is restricted and prevents the deformation in the in-plane direction (xy in-plane direction). It is sandwiched between the restraint portions 20 in the absence state.

When a building vibrates due to an earthquake or the like, the vibration is transmitted to the vibration damping device 1 via the studs 90u and 90b. Vibration energy is absorbed by the low yield point steel sheet 10 in the vibration damping device 1 being plastically deformed in the xy in-plane direction by a shearing force. At this time, the restraint portion 20 limits the deformation of the low yield point steel sheet 10 in the z-axis direction. In this way, the vibration of the building is suppressed. Subsequently, the detailed structure of the vibration damping device 1 will be described.

[Structure of vibration damping device]
FIG. 2 is a diagram for explaining the structure of the vibration damping device according to the first embodiment of the present invention. FIG. 3 is a schematic view for explaining a cross section taken along the A1-A2 cutting line in FIG. As described above, the vibration damping device 1 includes a low yield point steel plate 10 arranged apart from the webs 95u and 95b.

The low yield point steel sheet 10 is a steel sheet having a lower yield shear force with respect to the webs 95u and 95b. The low yield point steel sheet 10 includes an upper holding region 10u (first holding region) and a lower holding region 10b (second holding region) as regions at both ends in the x-axis direction, and includes an upper holding region 10u and a lower holding region 10b. Includes a deformed area of 10 m arranged between. That is, the upper holding region 10u is provided at one end of the deformation region 10m, and the lower holding region 10b is provided at the other end. Both the upper holding region 10u and the lower holding region 10b are quadrangular regions and have a length in the y-axis direction. The deformation region 10m is a quadrangular region and is close to a square having substantially the same length in the x-axis direction and the y-axis direction, but may have a longitudinal length in either the x-axis direction or the y-axis direction. In this example, the upper holding region 10u and the lower holding region 10b are longer than the deformation region 10m in the y-axis direction. Therefore, the upper holding region 10u and the lower holding region 10b have a higher yield shear force than the deformation region 10m.

Here, the yield shear force shown in the present specification will be briefly described. The yield shear force in the y-axis direction is proportional to the cross-sectional area A of the plane (the plane including the y-axis and the z-axis) whose normal direction is the x-axis direction. Further, the product of the cross-sectional area A and the shear stress degree (yield point) τ is the yield shear force Q. Therefore, in a situation where the shear stress degree τ does not change, the smaller the cross-sectional area A, the smaller the yield shear force Q. Assuming that the length of the low yield point steel sheet 10 in the y-axis direction is D and the length in the z-axis direction (corresponding to the thickness) is t, A is represented by the product of D and t.

In this example, the cross-sectional area A1 of the deformed region 10 m is smaller than the cross-sectional area A2 of the upper holding region 10u even when the region through which the high-strength bolt 74, which will be described later, penetrates is taken into consideration. The lower holding region 10b is the same as the upper holding region 10u. Therefore, the deformation region 10m has a lower yield shear force than the upper holding region 10u and the lower holding region 10b.

The upper holding region 10u includes an upper first connection region 101u (second region) and a lower second connection region 102u (first region). The first connection region 101u and the web 95u located in the upper direction of the upper holding region 10u are connected via the upper fixing portion 70. The upper fixing portion 70 includes splice plates 71, 72 and high-strength bolts 73, 74. The upper holding region 10u and the web 95u are covered by being sandwiched between the splice plate 71 and the splice plate 72. The splice plates 71 and 72 have a higher yield shear force than the deformed region 10 m so as not to yield before the deformed region 10 m. The high-strength bolt 73 penetrates the splice plates 71, 72 and the web 95u to secure these configurations to each other. The high-strength bolt 74 penetrates the splice plates 71, 72 and the upper holding region 10u to fix these configurations to each other. Since the upper holding region 10u has a higher yield shear force than the deformed region 10 m, it is less likely to yield than the deformed region 10 m, and the upper fixing portion 70 enables stable fixing. The splice plates 71 and 72 cover a part of the upper holding region 10u in the y-axis direction, but may cover the whole.

The lower holding region 10b includes a lower first connection region 101b (fourth region) and an upper second connection region 102b (third region). The first connection region 101b and the web 95b located in the lower direction of the lower holding region 10b are connected via the lower fixing portion 75. The lower fixing portion 75 includes splice plates 76, 77 and high-strength bolts 78, 79. The lower holding region 10b and the web 95b are covered by being sandwiched between the splice plate 76 and the splice plate 77. The splice plates 76, 77 have a yield shear force at least higher than the deformation region 10m so as not to yield before the deformation region 10m. High-strength bolts 78 penetrate splice plates 76, 77 and web 95b to secure these configurations to each other. The high-strength bolt 79 penetrates the splice plates 76, 77 and the lower holding region 10b to secure these configurations to each other. Since the lower holding region 10b has a higher yield shear force than the deformed region 10 m, it is less likely to yield than the deformed region 10 m, and the lower fixing portion 75 enables stable fixing. The splice plates 76 and 77 cover a part of the lower holding region 10b in the y-axis direction, but may cover the whole.

The restraint portion 20 includes a first restraint plate 21 (second plate portion) and a second restraint plate 22 (third plate portion). The first restraint plate 21 and the second restraint plate 22 are both quadrangular steel plates. It is preferable that the first restraint plate 21 and the second restraint plate 22 have higher rigidity against out-of-plane deformation than the deformation region 10 m in the low yield point steel sheet 10. The first restraint plate 21 and the second restraint plate 22 are fixed to the low yield point steel plate 10 by the first fixing portion 40 and the second fixing portion 50. At this time, the first restraint plate 21 and the second restraint plate 22 are rotatably fixed to the low yield point steel plate 10 by the first fixing portion 40. Further, the first restraint plate 21 and the second restraint plate 22 are rotatably fixed to the low yield point steel plate 10 by the second fixing portion 50.

The first fixing portion 40 has a fixing tool 45 such as a bolt. The fixture 45 penetrates the first restraint plate 21, the second restraint plate 22, and the upper holding region 10u (more specifically, the second connection region 102u) sandwiched between them, and xy-planes these configurations with each other. Fix it in a rotatable state inside. The center of this rotation corresponds to the position of the fixture 45. The second fixing portion 50 has a fixing tool 55 such as a bolt. The fixture 55 penetrates the first restraint plate 21, the second restraint plate 22, and the lower holding region 10b (more specifically, the second connection region 102b) sandwiched between them, and xy-planes these configurations with each other. Fix it in a rotatable state inside. The center of this rotation corresponds to the position of the fixture 55.

[Movement of vibration damping device]
Subsequently, the movement of the vibration damping device 1 when the vibration is transmitted to the studs 90u and 90b will be described.

FIG. 4 is a diagram showing the movement of the vibration damping device according to the first embodiment of the present invention. In the example shown in FIG. 5, the movement of the vibration damping device 1 when vibration in the y-axis direction occurs in the studs 90u and 90b is shown. As shown in FIG. 5, when the studs 90u and 90b vibrate in the y-axis direction, the low yield point steel sheet 10 undergoes in-plane plastic deformation, whereby vibration energy is absorbed.

In the low yield point steel sheet 10, both ends in the x-axis direction are fixed, while both ends in the y-axis direction are not fixed. Therefore, the low yield point steel sheet 10 can efficiently use the shearing force due to the vibration in the y-axis direction for plastic deformation. The plastic deformation occurs in the deformation region 10m rather than the upper holding region 10u and the lower holding region 10b. On the other hand, since the deformation region 10m is restrained from moving in the z-axis direction by the restraint portion 20, the deformation region 10m has almost no effect on plastic deformation in the plane. As described above, the low yield point steel sheet 10 can absorb the vibration energy by efficiently using the shearing force for the plastic deformation in a state where the deformation (buckling) in the out-of-plane direction is suppressed.

More specifically, in this example, the restraint portion 20 is fixed to each of the upper holding region 10u and the lower holding region 10b in an in-plane rotatable state. Therefore, even if the positional relationship between the first fixed portion 40 and the second fixed portion 50 is distorted due to the vibration of the studs 90u and 90b, the restraining portion 20 remains substantially independent of the plastic deformation of the deformation region 10 m. It rotates and follows the distortion of the positional relationship. As a result, the restraint portion 20 suppresses the deformation (buckling) of the low yield point steel sheet 10 in the out-of-plane direction without generating a large load on the first fixing portion 40 and the second fixing portion 50.

<2nd to 5th embodiments>
The low yield point steel plate 10 and the restraint portion 20 (first restraint plate 21, second restraint plate 22) in the first embodiment are all quadrangular steel plates, but are not limited to quadrangular ones. Hereinafter, various shapes will be illustrated as the second to fifth embodiments.

FIG. 5 is a diagram for explaining the structure of the vibration damping device according to the second embodiment of the present invention. The vibration damping device 1A in the second embodiment includes a low yield point steel sheet 10A having a shape different from that of the low yield point steel sheet 10. The deformation region 10m of the low yield point steel sheet 10A is a region where the length in the y-axis direction gradually changes as it moves in the x-axis direction at the boundary portion with the upper holding region 10u and the boundary portion with the lower holding region 10b. Has 10c. In other words, the cross-sectional area A in the region 10c (the cross-sectional area of the surface whose normal direction is the x-axis direction) gradually decreases from the cross-sectional area A2 of the upper holding region 10u to the cross-sectional area A1 of the deformation region 10m. It can be said that the deformed region 10m has a region on the upper holding region 10u side in which the cross-sectional area (cross-sectional area of the surface whose normal is the first direction) gradually changes. The relationship between the cross-sectional area of the lower holding region 10b and the cross-sectional area A1 is also the same. In this way, in the low yield point steel sheet 10A, the region where stress concentration is concentrated can be reduced as compared with the low yield point steel sheet 10.

FIG. 6 is a diagram for explaining the structure of the vibration damping device according to the third embodiment of the present invention. The vibration damping device 1B in the third embodiment includes a low yield point steel plate 10B having a shape different from that of the low yield point steel plate 10 in the first embodiment. The deformation region 10 mB in the low yield point steel plate 10B gradually shortens in the y-axis direction from both the upper holding region 10u and the lower holding region 10b toward the central portion in the x-axis direction, and the length in the y-axis direction gradually decreases in the central portion in the y-axis direction. Has a shape that minimizes the length of. In other words, the cross-sectional area A1 of the deformed region 10 mB gradually decreases from the cross-sectional area A2 of the upper holding region 10u toward the central portion in the x-axis direction, and the deformed region 10 mB has a cross-sectional area (on the upper holding region 10u side). It can be said that it has a region where the cross-sectional area of the surface whose normal is the first direction) gradually changes. The relationship between the cross-sectional area of the lower holding region 10b and the cross-sectional area A1 is also the same. In this example, the deformation region 10 mB has a curved shape (for example, an arc shape) as the edge shapes CB1 and CB2 at both ends in the y-axis direction. In this way, in the low yield point steel sheet 10B, the region where stress concentration is concentrated can be reduced as compared with the low yield point steel sheet 10. Further, the central portion in the x-axis direction is a region that is easily deformed because the yield shear force is small because the length in the y-axis direction is shorter than the other portions. Therefore, as in this example, by arranging the restraint plate at least in the central portion of the deformation region 10 mB in the x-axis direction, the deformation (buckling) of the deformation region 10 mB in the out-of-plane direction is efficiently suppressed. can do.

FIG. 7 is a diagram for explaining the structure of the vibration damping device according to the fourth embodiment of the present invention. The vibration damping device 1C in the fourth embodiment includes a low yield point steel sheet 10C having a shape different from that of the low yield point steel sheet 10 in the first embodiment. The deformation region 10mC in the low yield point steel plate 10C gradually shortens in the y-axis direction from both the upper holding region 10u and the lower holding region 10b toward the central portion in the x-axis direction, and the length in the y-axis direction gradually decreases in the central portion in the y-axis direction. Has a shape that minimizes the length of. In other words, the cross-sectional area A1 of the deformed region 10 mC gradually decreases from the cross-sectional area A2 of the upper holding region 10u toward the central portion in the x-axis direction, and the deformed region 10 mC has a cross-sectional area (on the upper holding region 10u side). It can be said that it has a region where the cross-sectional area of the surface whose normal is the first direction) gradually changes. The relationship between the cross-sectional area of the lower holding region 10b and the cross-sectional area A1 is also the same. In this example, the deformation region 10 mC has a shape in which two straight lines are combined as edge shapes CC1 and CC2 at both ends in the y-axis direction. In this way, in the low yield point steel sheet 10C, the region where stress concentration is concentrated can be reduced as compared with the low yield point steel sheet 10. Further, the central portion in the x-axis direction is a region that is easily deformed because the yield shear force is small because the length in the y-axis direction is shorter than the other portions. Therefore, as in this example, by arranging the restraint plate at least in the central portion of the deformation region 10mC in the x-axis direction, deformation (buckling) of the deformation region 10mC in the out-of-plane direction is efficiently suppressed. can do.

FIG. 8 is a diagram for explaining the structure of the vibration damping device according to the fifth embodiment of the present invention. The vibration damping device 1D in the fifth embodiment includes a restraint portion 20D having a shape different from that of the restraint portion 20 in the third embodiment. The length of the first restraint plate 21D in the restraint portion 20D gradually increases in the y-axis direction from both ends in the x-axis direction toward the central portion in the x-axis direction, and the length in the y-axis direction becomes maximum at the central portion. Has a shape. In this example, the first restraint plate 21D has a curved shape (for example, an arc shape) as the edge shape CD1 in the y-axis direction in the portion covering the deformation region 10 mB. The second restraint plate 22D (not shown) corresponding to the first restraint plate 21D also has the same shape as the first restraint plate 21D.

In this example, the edge shape CD1 has a shape symmetrical with respect to the x-axis with the edge shape CB1 having a deformation region of 10 mB, but may have a different shape. As described above, the deformation region 10 mB is easily deformed in the central portion in the x-axis direction. Therefore, as shown in FIG. 8, the edge shape CD1 and the edge shape CB1 have a short distance in the central portion in the x-axis direction, so that the deformation region 10 m is deformed in the out-of-plane direction (z-axis direction) (buckling). It is possible to efficiently suppress bending).

The edge shapes CD1 and CD2 are not limited to this shape, and various shapes can be taken. For example, the first restraint plate 21D may have a shape in which two straight lines are combined as an edge shape in the y-axis direction, such as the outer edge shape CC1 of the deformation region 10 mC in the fourth embodiment. Here, when the ribs described in the sixth embodiment described later are provided, the width is along the x-axis direction in a region longer than the other portions, particularly in a region where the width of the first restraint plate 21D suddenly increases. It is more effective to place the ribs. In this example, it is more effective to arrange the ribs along the x-axis direction at the central portion of the first restraint plate 21D in the x-axis direction.

<Sixth Embodiment>
By having the stiffening structure, the restraint portion 20 in the first embodiment may more efficiently suppress the movement of the deformation region 10 m in the low yield point steel sheet 10 in the out-of-plane direction. Various structures can be used as the stiffening structure, but in the sixth embodiment, an example in which ribs are used as the stiffening structure will be described.

FIG. 9 is a diagram for explaining the structure of the vibration damping device according to the sixth embodiment of the present invention. FIG. 10 is a schematic view for explaining a cross section at the B1-B2 cutting line in FIG. The vibration damping device 1E according to the sixth embodiment includes the restraint portion 20E in which the restraint portion 20 according to the first embodiment is provided with a stiffening structure.

The restraint portion 20E includes a first restraint plate 21, a second restraint plate 22, a first rib 25 and a second rib 26. The first rib 25 is a plate-shaped member protruding from the surface of the first restraint plate 21 opposite to the deformation region 10 m. The first rib 25 has a surface substantially perpendicular to the first restraint plate 21, and has a longitudinal length in the y-axis direction when viewed along the z-axis direction. In this example, two first ribs 25 are provided with respect to the first restraint plate 21. Only one first rib 25 may be provided for the first restraint plate 21, or more first ribs 25 may be provided. Further, the shape of the first rib 25 is not limited to the case where the first rib 25 has a length along the y-axis direction when viewed along the z-axis direction, and may have a length along another direction, or may have a length along the other direction. It may have a curved shape. That is, the first rib 25 is not limited to a plate shape having a flat surface, but may be a plate shape having a curved surface. Further, the first rib 25 may have a structure in which surfaces in a plurality of directions intersect each other, such as a lattice shape. Since the relationship between the second restraint plate 22 and the second rib 26 is the same as the relationship between the first restraint plate 21 and the first rib 25, the description of the relationship will be omitted.

In this way, by using a stiffening member such as a rib, the rigidity of the first restraint plate 21 and the second restraint plate 22 is increased, so that the deformation region 10 m of the low yield point steel plate 10 is deformed in the out-of-plane direction ( Buckling) can be suppressed more firmly.

<7th Embodiment>
In the first embodiment, one restraint portion 20 is provided for one low yield point steel sheet 10, but a plurality of restraint portions may be provided. In the seventh embodiment, the vibration damping device 1F provided with two restraint portions 20aF and 20bF for one low yield point steel sheet 10 will be described.

FIG. 11 is a diagram for explaining the structure of the vibration damping device according to the seventh embodiment of the present invention. The vibration damping device 1F in the seventh embodiment includes a restraint portion 20aF and a restraint portion 20bF. Both the restraint portion 20aF and the restraint portion 20bF have a configuration corresponding to a pair of the first restraint plate 21 and the second restraint plate 22 as in the restraint portion 20 in the first embodiment, and each has a length in the y-axis direction. It differs in that it is shorter.

That is, the first restraint plate 21aF (and the second restraint plate 22aF (not shown)) in the restraint portion 20aF can be rotated with respect to the low yield point steel plate 10 (upper holding region 10u) by the first fixing portion 40aF (fixing tool 45aF). It is fixed in a good state. The first restraint plate 21bF (and the second restraint plate 22bF (not shown) in the restraint portion 20bF is rotatable with respect to the low yield point steel plate 10 (upper holding region 10u) by the first fixing portion 40bF (fixing tool 45bF). It is fixed at. The first restraint plate 21bF (and the second restraint plate 22bF (not shown) in the restraint portion 20bF is rotatable with respect to the low yield point steel plate 10 (upper holding region 10u) by the first fixing portion 40bF (fixing tool 45bF). It is fixed at. The first restraint plate 21bF (and the second restraint plate 22bF (not shown) in the restraint portion 20bF is rotatable with respect to the low yield point steel plate 10 (lower holding region 10b) by the first fixing portion 40bF (fixing tool 45bF). It is fixed at.

On the other hand, the restraint portion 20 is arranged in the central portion (1/2 portion) of the deformation region 10 m in the y-axis direction, but the restraint portion 20aF and the restraint portion 20bF are 1 / of the deformation region 10 m in the y-axis direction. It is arranged in the 4th part and the 3/4 part. The restraint portion 20aF and the restraint portion 20bF are not limited to such an arrangement, and may be arranged so as to evenly divide the deformation region 10 m in the y-axis direction. For example, the restraint portion 20aF and the restraint portion 20bF may approach each other in the central portion in the y-axis direction to enhance the effect of suppressing deformation (buckling suppression) in the out-of-plane direction in the central portion of the deformation region 10 m.

<8th Embodiment>
In the first embodiment, the restraint portion 20 is fixed to the low yield point steel plate 10 in a rotatable state, but can be rotated to the low yield point steel plate 10 by changing the structure of the plate-shaped member. It may be fixed in a state where it is not. In the eighth embodiment, the structure of the restraint portion which may be fixed to the low yield point steel plate 10 in a double-sided structure and in a non-rotatable state will be described.

FIG. 12 is a diagram for explaining the structure of the vibration damping device according to the eighth embodiment of the present invention. FIG. 13 is a schematic view for explaining a cross section at the C1-C2 cutting line in FIG. The vibration damping device 1G in the eighth embodiment includes a restraint portion 20G. The restraint portion 20G is fixed to the low yield point steel plate 10 by the first fixing portion 40G and the second fixing portion 50G.

The restraint portion 20G includes a first restraint plate 21G and a second restraint plate 22G. The first restraint plate 21G is formed with a plurality of slits 28G having lengths in the x-axis direction. The second restraint plate 22G is formed with a plurality of slits 29G having lengths in the x-axis direction. The first restraint plate 21G and the second restraint plate 22G have a structure in which a plurality of plate-like members having a narrow width and a longitudinal length in the x-axis direction are connected at an end by forming a slit.

The first fixing portion 40G has a fixing tool 45G such as a high-strength bolt. The fixture 45G penetrates the first restraint plate 21G, the second restraint plate 22G, and the upper holding region 10u of the low yield point steel plate 10 sandwiched between them, and fixes these configurations to each other. The second fixing portion 50G has a fixing tool 55G such as a high-strength bolt. The fixture 55G penetrates the first restraint plate 21G, the second restraint plate 22G, and the lower holding region 10b of the low yield point steel plate 10 sandwiched between them, and fixes these configurations to each other.

Subsequently, the movement of the vibration damping device 1G when the vibration is transmitted to the studs 90u and 90b will be described.

FIG. 14 is a diagram showing the movement of the vibration damping device according to the eighth embodiment of the present invention. FIG. 14 corresponds to FIG. 4 described in the first embodiment. As described above, the first restraint plate 21G and the second restraint plate 22G have a structure in which a plurality of narrow plate-shaped members are connected by slits 28G and 29G. This narrow plate-shaped member has a structure that is easily deformed in the xy plane in the vicinity of both end portions (both end portions of the slit). Therefore, even if the positional relationship between the first fixed portion 40G and the second fixed portion 50G is distorted due to the vibration of the studs 90u and 90b, as shown in FIG. 14, in the vicinity of both ends of the slit in the restraining portion 20G, in the xy plane. By deforming, the restraint portion 20G suppresses the deformation (buckling) of the low yield point steel sheet 10 in the out-of-plane direction without generating a large load on the first fixing portion 40G and the second fixing portion 50G. Maintain the ability to do.

<9th embodiment>
In the first embodiment, the upper holding region 10u and the lower holding region 10b are increased in strength by making them longer than the deformation region 10m in the y-axis direction, but the thickness (length in the z-axis direction) is increased. The yield shear force may be increased by increasing the thickness.

FIG. 15 is a diagram for explaining the structure of the vibration damping device according to the ninth embodiment of the present invention. FIG. 16 is a schematic view for explaining a cross section at the D1-D2 cutting line in FIG. The vibration damping device 1H in the ninth embodiment includes a low yield point steel plate 10H. The low yield point steel sheet 10H includes an upper holding region 10uH, a lower holding region 10bH, and a deformation region 10mH. The upper holding region 10uH and the lower holding region 10bH have the same length in the y-axis direction as the deformation region 10mH. On the other hand, the upper holding region 10uH and the lower holding region 10bH are thicker than the deformation region 10mH. As a result, the yield shear force of the upper holding region 10uH and the lower holding region 10bH is higher than that of the deformed region 10mH.

In this example, since the upper holding region 10uH and the lower holding region 10bH have almost the same thickness as the webs 95u and 95b, the method of fixing the low yield point steel plate 10H to the webs 95u and 95b is the same as that of the first embodiment. It is realized by the fixing portion 70 and the lower fixing portion 75. On the other hand, since the deformation region 10mH is thinner than the upper holding region 10uH and the lower holding region 10bH, the restraint portion 20H is fixed to the first restraint plate 21 between, for example, the first restraint plate 21 and the deformation region 10mH. An auxiliary plate 23 is arranged. An auxiliary plate 24 fixed to the second restraint plate 22 is also arranged between the second restraint plate 22 and the deformation region 10 mH. In this example, the restraint plate and the auxiliary plate fixed to the restraint plate are separately formed steel plates, but the restraint plate and the auxiliary plate fixed to the restraint plate may be integrally formed.

Although FIG. 16 shows an example in which the position of the deformation region 10mH with respect to the upper holding region 10uH and the lower holding region 10bH is the central portion in the z-axis direction, the position may be biased to one side instead of the central portion. .. In this case, the thicknesses of the auxiliary plates arranged on both sides of the deformation region 10 mH may be different, or one of the auxiliary plates may not be provided. Further, a region that gradually becomes thinner may be arranged between the upper holding region 10uH (lower holding region 10bH) and the deformation region 10mH. In other words, the deformation region 10mH is the upper holding region 10uH (lower holding region 10bH). ) Side may have a region where the cross-sectional area (the cross-sectional area of the surface whose normal is the first direction) gradually changes.

<10th Embodiment>
In the restraint portion 20 in the first embodiment, the edge shape in the x-axis direction does not have to be a straight line. In the tenth embodiment, an example in which the edge shape in the x-axis direction is not a straight line will be described.

FIG. 17 is a diagram for explaining the structure of the vibration damping device according to the tenth embodiment of the present invention. The vibration damping device 1J in the tenth embodiment includes a restraint portion 20J having a shape different from that of the restraint portion 20 in the first embodiment. The length of the first restraint plate 21J in the restraint portion 20J gradually increases in the x-axis direction from both ends in the y-axis direction toward the central portion in the y-axis direction, and the length in the x-axis direction becomes maximum at the central portion. Has a shape. In this example, the restraint portion 20J has a curved shape (for example, an arc shape) as the edge shapes CJa and CJb in the x-axis direction. The first restraint plate 21J has the same shape as the first restraint plate 21J for the second restraint plate 22J (not shown) corresponding to the first restraint plate 21J.

As described above, the distance between the edge shape CJa and the splice plate 71 increases as the distance from the fixture 45 in the y-axis direction increases, and the distance between the edge shape CJb and the splice plate 76 increases as the distance from the fixture 55 in the y-axis direction increases. The distance becomes large. As a result, even if the positional relationship between the fixture 45 and the fixture 55 is displaced and the first restraint plate 21J rotates, the first restraint plate 21J does not easily come into contact with the splice plates 71 and 76. It will be realized. Thereby, the distance between the fixture 45 and the splice plate 71 and the distance between the fixture 55 and the splice plate 76 can be reduced. When the edge shapes CJa and CJb include an arc shape, it is desirable that the radius of curvature of the arc is smaller than the distance between the fixture 45 and the fixture 55.

<11th Embodiment>
The deformed region 10 m of the low yield point steel sheet 10 in the first embodiment had a substantially uniform thickness, but the thickness may be different in some regions. In the eleventh embodiment, an example having a depression in the central portion of the deformed region will be described.

FIG. 18 is a diagram for explaining the structure of the vibration damping device according to the eleventh embodiment of the present invention. FIG. 19 is a schematic view for explaining a cross section at the E1-E2 cutting line in FIG. The vibration damping device 1K in the eleventh embodiment includes a low yield point steel sheet 10K having a surface shape different from that of the low yield point steel sheet 10. The deformation region 10mK in the low yield point steel sheet 10K has a recessed region 10Kh in the central portion. The recessed region 10Kh is circular when viewed along the z-axis direction as shown in FIG. 18, and is formed so as to be deeper toward the central portion when viewed along the x-axis direction as shown in FIG. ing. In this example, the surface of the recessed region 10 Kh has the shape of a part of a spherical surface. Therefore, the deformed region 10 mK is the thinnest in the central portion of the recessed region 10 Kh. In this way, the yield shear force can be reduced in the central portion of the deformation region 10 mK.

In the deformation region 10 mK, a plurality of recessed regions 10 Kh may be arranged. Further, the shape of the recessed region 10 Kh is not limited to the shape shown in FIGS. 18 and 19, and can be changed in various ways. Further, although FIG. 19 shows an example in which the region of the deformation region 10 mK that becomes thinner due to the formation of the recessed region 10 Kh is the central portion in the z-axis direction, the region is not the central portion but is biased to one side. good. As a result, the recessed region 10 Kh may be arranged only on any surface of the deformed region 10 mK.

<Modification example>
Although one embodiment of the present invention has been described above, each of the above-described embodiments can be applied by combining or substituting with each other. Further, in each of the above-described embodiments, it is possible to carry out the modification as follows. In the following description, an example of modification based on the first embodiment is shown, but modification is also possible based on other embodiments.

(1) In the first embodiment, the magnitude relationship of the plate thickness with respect to each of the low yield point steel plate 10, the first restraint plate 21, the second restraint plate 22, the splice plates 71, 72, 76, 77, and the webs 95u and 95b is determined. , Although shown as an example in FIG. 3, the magnitude relationship of the plate thickness between the configurations may be different from the illustrated example.

(2) In the first embodiment, the vibration damping device 1 is connected to the H-shaped steel whose flange is bonded to the web, but the web and at least two steel plates corresponding to the flange are angled. It may be arranged in a steel material having another shape such as an I-shaped steel, a T-shaped steel, a Z-shaped steel, a channel steel, and an angle steel.

(3) In the first embodiment, the fixing between steel materials using high-strength bolts for frictional joining may be fixed by another joining method such as bearing pressure joining.

(4) The second restraint plate 22 may not be present in the first embodiment. That is, the restraint plate may be arranged only on one side with respect to the low yield point steel sheet 10. As described above, even if the restraint plate is arranged only on one surface side of the low yield point steel sheet 10, the displacement of the low yield point steel sheet 10 in the out-of-plane direction can be suppressed. When the restraint plates are arranged on both sides of the low yield point steel sheet 10 as in the first embodiment, the displacement of the low yield point steel sheet 10 in the out-of-plane direction can be more strongly suppressed. According to this, the amount of steel used can be reduced.

1,1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H, 1J, 1K ... Vibration damping device, 10,10A, 10B, 10C, 10H ... Low yield point steel plate, 10m, 10mB, 10mC, 10mH, 10mK ... deformation region, 10u, 10uH ... upper holding region, 10b, 10bH ... lower holding region, 10c ... region, 10Kh ... recessed region, 20, 20aF, 20bF, 20D, 20E, 20G, 20H, 20J ... restraint portion 21, 21aF, 21bF, 21D, 21G, 21J ... 1st restraint plate, 22, 22aF, 22bF, 22D, 22G, 22J ... 2nd restraint plate, 23, 24 ... Auxiliary plate, 25 ... 1st rib, 26 ... 2nd rib , 28G, 29G ... Slit, 40, 40aF, 40bF, 40G ... First fixing part, 45, 45aF, 45bF, 45G ... Fixing tool, 50, 50G ... Second fixing part, 55, 55G ... Fixing tool, 70 ... Upper part Fixed parts, 71, 72, 76, 77 ... Splice plates, 73, 74, 78, 79 ... High-strength bolts, 75 ... Lower fixing parts, 90, 90b, 90u ... Studs, 92b, 92u, 94b, 94u ... Flange, 95b, 95u ... Web, 101b, 101u ... First connection area, 102b, 102u ... Second connection area

Claims (12)

A first plate portion including a deformation region, a first holding region provided at one end of the deformation region, and a second holding region provided at the other end of the deformation region, which is the first holding region. The first plate portion in which the second holding region has a yield shear force lower than that of the deformed region,
The second plate portion arranged on the first surface side of the first plate portion and
A first fixing portion that rotatably fixes the second plate portion to the first plate portion in the first holding region, and a first fixing portion.
A second fixing portion that rotatably fixes the second plate portion to the first plate portion in the second holding region, and a second fixing portion.
A vibration damping device equipped with. A third plate portion arranged on the second surface side opposite to the first surface side of the first plate portion is further provided.
In the first holding region, the first fixing portion fixes the second plate portion and the third plate portion in a rotatable state with respect to the first plate portion.
The control according to claim 1, wherein the second fixing portion fixes the second plate portion and the third plate portion in a rotatable state with respect to the first plate portion in the second holding region. Vibration device. The vibration damping device according to claim 1 or 2, wherein a plurality of the second plate portions are arranged on the first surface side of the first plate portion. A first plate portion including a deformation region, a first holding region provided at one end of the deformation region, and a second holding region provided at the other end of the deformation region, which is the first holding region. The first plate portion in which the second holding region has a yield shear force lower than that of the deformed region,
A second plate portion arranged on the first surface side of the first plate portion and including a slit extending in one direction, and a second plate portion.
A first fixing portion for fixing the second plate portion to the first plate portion in the first holding region,
A second fixing portion for fixing the second plate portion to the first plate portion in the second holding region,
A vibration damping device equipped with. A third plate portion which is arranged on the second surface side of the first plate portion opposite to the first surface side and includes a slit extending in one direction is further provided.
In the first holding region, the first fixing portion fixes the second plate portion and the third plate portion to the first plate portion.
The vibration damping device according to claim 4, wherein the second fixing portion fixes the second plate portion and the third plate portion to the first plate portion in the second holding region. The vibration damping device according to claim 4 or 5, wherein the slit extends along a first direction connecting the first fixing portion and the second fixing portion. In the first holding region, the first plate portion can be fixed to the structure of the building on the side opposite to the deformed region with respect to the first region in which the first fixing portion is arranged and the first region. Includes a second area covered by a splice plate
In the second holding region, the first plate portion is fixed to the structure of the building on the side opposite to the deformation region with respect to the third region in which the second fixing portion is arranged and the third region. The vibration damping device according to any one of claims 1 to 6, which includes a fourth region covered with a possible splice plate. A claim that the first holding region and the second holding region have a larger cross-sectional area of a surface having a normal in the first direction connecting the first fixed portion and the second fixed portion than the deformed region. The vibration damping device according to any one of 1 to 7. The vibration damping device according to claim 8, wherein the deformed region includes a region in which the cross-sectional area gradually changes on the first holding region side. The vibration damping device according to claim 8 or 9, further comprising an auxiliary plate arranged between the second plate portion and the first plate portion. The vibration damping device according to any one of claims 1 to 10, wherein the second plate portion includes a rib protruding from a surface opposite to the first plate portion. The vibration damping device according to claim 10, wherein the ribs are arranged so as to extend in a second direction perpendicular to the first direction connecting the first fixing portion and the second fixing portion.

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