JP5409472B2 - Bracing and seismic structure - Google Patents

Description

The present invention relates to a bracing and an earthquake resistant structure provided with the bracing.
About.

  Conventionally, various technologies have been proposed in which a brace is provided on a rectangular structural member constructed by a pair of columns and a pair of beams to suppress deformation of the structural member due to an earthquake or the like (for example, Patent Document 1).

  In Patent Document 1, the bracing of a wooden frame is made by using a rod-like bracing main body, a vibration energy absorption mechanism using a metal that is plastically deformed as a vibration absorber connected to one end side of the bracing main body, and the other end side of the bracing main body. And an extendable length adjusting mechanism connected to the. In this bracing, the vibration during an earthquake is absorbed by the vibration energy absorption mechanism.

JP 2005-171646 A

  However, when the shaking at the time of the earthquake is large, the brace is plastically deformed, and the rectangular structural member is deformed into a diamond shape. After that, even if the structural member returns to the original shape (rectangular shape), the brace shape deformed plastically does not return to the initial shape (initial state). In particular, when the bracing length is extended due to plastic deformation, the bracing of the structural member is continued until the structural member is deformed to a certain degree of rhombus with respect to the subsequent shaking, that is, until the bracing is extended by an amount longer than the initial state. The effect of suppressing deformation is not exhibited.

  In view of the above facts, the present invention has an object to provide a brace capable of returning to the length before plastic deformation even if the length is increased by plastic deformation and an earthquake-resistant structure including the brace. .

  The brace of claim 1 is a brace in which one end is attached to the first support portion of the structural member and the other end is attached to the second support portion of the structural member, and the one end portion in the cylinder axis direction is A cylindrical member attached to the first support part, one end side in the axial direction is inserted into the cylindrical member, the other end part in the axial direction is attached to the second support part, and an intermediate part in the axial direction The portion inserted into the cylindrical member is formed with a plastic deformation portion that is more likely to be plastically deformed by tension than the other portions, and the first engaging portion is closer to one end side in the axial direction than the plastic deformation portion. The rod-shaped member configured and the cylindrical member are configured to engage with the first engaging portion to prevent the rod-shaped member from moving in the direction of withdrawal from the cylindrical member, and A second engaging portion that allows movement in the insertion direction to the tubular member; A stopper member that is provided on the other end side in the axial direction of the plastic deformation portion of the rod-shaped member and prevents the rod-shaped member from moving in the insertion direction by contacting the other end portion of the tubular member in the tube axial direction. And.

  In the bracing according to claim 1, when a compressive force acts on the bracing by receiving a force in a direction in which the first support portion and the second support portion move relative to each other due to shaking during an earthquake, etc. The other end portion in the cylinder axis direction abuts on a stopper member provided on the rod-shaped member, and the movement of the rod-shaped member in the insertion direction into the cylindrical member is prevented.

On the other hand, when a tensile force acts on the braces when the first support part and the second support part receive a force in a direction in which the first support part and the second support part move relative to each other due to shaking during an earthquake, the second engaging part is Engaging with the engaging portion of 1, the movement of the rod-shaped member in the withdrawal direction from the cylindrical member is prevented.
From the above, the relative movement of the first support portion and the second support portion relative to each other is suppressed, and deformation of the structural member is suppressed.

  Here, when the tensile force acting on the bracing is equal to or greater than a predetermined value, the plastic deformation portion in the rod-like member that is most likely to undergo plastic deformation due to tension is plastically deformed and stretched. For this reason, the length of bracing becomes longer than before plastic deformation.

  Thereafter, when the first support portion and the second support portion start to return to their original positions, a compressive force acts on the braces along with this, and the rod-shaped member moves in the insertion direction. At this time, the plastic deformation portion is bent by receiving a compressive force, but since the bent portion is supported by being in contact with the inner peripheral surface of the cylindrical member, plastic deformation such as bending is suppressed.

  And when the 1st support part and the 2nd support part return to an original position, the other end part of the cylinder axis direction of a cylindrical member will contact a stopper member provided in a rod-shaped member, and the above-mentioned of a rod-shaped member Movement in the insertion direction is prevented. As a result, the amount of extension of the plastic deformation portion due to the plastic deformation is adjusted, and the length of the braces returns to the length before the plastic deformation.

That is, the bracing can be returned to the length before plastic deformation even if the length is increased by plastic deformation.
When the first support portion and the second support portion receive a force in a direction in which the first support portion and the second support portion move in parallel with each other and a tensile force acts on the braces, the second engagement portion becomes the first engagement portion. Since the movement of the rod-shaped member in the withdrawal direction is prevented, the bracing exhibits substantially the same resistance force as before plastic deformation even after returning to the length before plastic deformation. The first support portion and the second support portion can be prevented from moving relative to each other in parallel.

  The bracing of claim 2 is the bracing of claim 1, wherein a plurality of leaf spring portions that are elastically deformable radially outward of the cylindrical member are arranged in an annular shape on the inner peripheral portion of the cylindrical member. The first engagement portion is a first male screw portion formed on the outer peripheral surface of the rod-shaped member, and the second engagement portion is an inner ring of the elastic ring. A female screw portion formed on a peripheral surface and screwed into the first male screw portion; and the elastic ring is configured such that the leaf spring portion is radially outward of the cylindrical member when the rod-shaped member moves in the insertion direction. The inner diameter increases due to elastic deformation.

  In the bracing of claim 2, when the rod-shaped member is moved in the insertion direction, the leaf spring portion is elastically deformed radially outward of the cylindrical member and the inner diameter of the elastic ring is increased. The threaded state with the female thread portion is released, and the movement of the rod-shaped member in the insertion direction is allowed.

  On the other hand, when the rod-shaped member moves in the withdrawal direction, the leaf spring portion does not elastically deform outward in the radial direction of the cylindrical member, so that the inner diameter of the elastic ring does not increase, and the first male screw portion and the female screw portion are not screwed. The combined state is maintained, and the movement of the rod-shaped member in the withdrawal direction is prevented.

  That is, according to the brace of claim 2, the first male screw portion formed on the outer peripheral surface of the rod-shaped member is used to prevent the rod-shaped member from moving in the pull-out direction and to allow the rod-shaped member to move in the insertion direction. This can be achieved with a simple configuration of an internal thread formed on the inner peripheral surface of the elastic ring.

  The brace of claim 3 is the brace of claim 1 or claim 2, wherein the rod-shaped member has a second male screw portion formed on the outer peripheral surface on the other end side, the stopper member is formed into a cylindrical shape, An internal thread portion is formed on the peripheral surface, and the internal thread portion of the stopper member is screwed into the second external thread portion.

  In the bracing of the third aspect, the position of the stopper member can be moved along the axial direction of the rod-shaped member by rotating the stopper member relative to the rod-shaped member. That is, it is possible to adjust the position where the other end portion of the cylindrical member in the cylinder axis direction contacts the stopper member. Thereby, the length of bracing can be adjusted freely.

  The bracing of claim 4 is the bracing of any one of claims 1 to 3, wherein the tensile strength of the plastic deformation portion satisfies 490 MPa or more.

  In the bracing according to claim 4, the tensile strength of the plastic deformation portion satisfies 490 MPa or more, thereby improving the effect of suppressing the relative movement of the first support portion and the second support portion in parallel with each other.

  The seismic structure according to claim 5 is a structural member having a first support portion and a second support portion, one end portion is attached to the first support portion, and the other end portion is attached to the second support portion. The brace according to any one of claims 1 to 4 is attached.

  In the seismic structure according to claim 5, since the braces are attached to the structural member that can return to the length before the plastic deformation even if the length is increased by plastic deformation, the structural member is not deformed due to the shaking at the time of the earthquake. Is always effectively suppressed.

  As described above, the brace of the present invention can be returned to the length before plastic deformation even if the length is increased by plastic deformation. In addition, since the seismic structure of the present invention has a brace attached to the structural member that can return to the length before the plastic deformation even if the length is increased by plastic deformation, the deformation of the structural member with respect to the shaking during the earthquake Can always be effectively suppressed.

It is a schematic front view of the building provided with the earthquake-proof structure which concerns on 1st Embodiment of this invention. It is a front view which shows the bracing and seismic structure which concern on 1st Embodiment of this invention. It is an assembly drawing of braces concerning a 1st embodiment of the present invention. It is sectional drawing which shows the side cross section of the special nut of 1st Embodiment. It is a top view which shows the elastic ring of the special nut of 1st Embodiment. It is a sectional side view around a special nut which shows the state where the external thread part of a rod-shaped member is screwing with the internal thread part of the elastic ring of a 1st embodiment. It is a cross-sectional side view of a bracing showing a state in which the rod-shaped member of the first embodiment is inserted into a tubular member and the bracing length is set. It is a sectional side view of a brace showing a state in which a tensile force acts on the brace of the first embodiment, and the plastic deformation portion is plastically deformed to extend the brace length. It is a sectional side view of a bracing showing the state where the bracing length of the first embodiment has returned to the length before plastic deformation. It is a sectional side view of the braces of other embodiment. (A) It is a sectional side view of the braces of other embodiment. (B) It is side sectional drawing which shows the state which a slide projection part slides to the radial inside of a rod-shaped member.

[First Embodiment]
The brace 20 according to the first embodiment of the present invention and the earthquake-resistant structure 10 including the brace 20 will be described with reference to FIGS.

  As shown in FIG. 1, the seismic structure 10 of the present embodiment includes a frame-shaped structural member 14 having a thickness and a width that can be accommodated in a Western-style wall of a detached building 12 or a Japanese-style wall, and this structural member. 14 and a brace 20 that reinforces 14.

  As shown in FIG. 2, the structural member 14 includes a pair of beams 18 disposed in parallel and extending in the horizontal direction and parallel to a pair of columns 16 extending in the vertical direction. The upper and lower ends of the column 16 are fixed to a pair of beams 18 by a joint metal (not shown). In addition, although the beam 18 below the first floor of the building 12 (see FIG. 1) is called a foundation, in the present embodiment, these are collectively called the beam 18.

  Further, the structural member 14 is configured in a rectangular shape by the columns 16 and the beams 18. Fixing brackets 22 and 23 formed by bending a flat plate are fixed to the pair of corners which are opposite to each other of the structural member 14 using screws. In the present embodiment, the fixing brackets 22 and 23 are fixed by screws. However, if the fixing brackets 22 and 23 can be fixed, they may be fixed using nails or bolts. Good. The fixing bracket 22 is an example of a first support portion, and the fixing bracket 23 is an example of a second support portion.

  As shown in FIG. 2, one end of the brace 20 (attachment portion 32 described later) is attached to the fixing bracket 22, and the other end portion (attachment portion 44 described later) of the brace 20 is attached to the fixing bracket 23. It has been.

As shown in FIG. 3, the brace 20 includes a tubular member 30 and a rod-like member 40.
The cylindrical member 30 includes an attachment portion 32 with the fixing bracket 22 on one end side in the cylindrical axis direction. The attachment portion 32 is rotatably attached to the fixing bracket 22. Specifically, the mounting portion 32 is fixed to the fixing bracket 22 by one set of bolts and nuts. The nut may be a double nut in consideration of prevention of loosening of the nut and bolt.

On the other hand, the cylindrical member 30 includes a cylindrical portion 34 on the other end side in the cylindrical axis direction. One end side in the axial direction of a rod-shaped member 40 to be described later is inserted into the cylindrical portion 34.
The cylindrical member 30 includes a special nut 36 provided at one end of the cylindrical portion 34 in the cylindrical axis direction. Details of the special nut 36 will be described later.

  As shown in FIG. 3, the rod-shaped member 40 includes a first male screw portion 42 on one end side in the axial direction, and a mounting portion 44 with the fixing bracket 23 on the other end side in the axial direction. The attachment portion 44 is rotatably attached to the fixing bracket 23. Specifically, the attachment portion 44 is fixed to the fixing bracket 23 by one set of bolts and nuts. The nut may be a double nut in consideration of prevention of loosening of the nut and bolt.

  Further, the rod-shaped member 40 includes a plastic deformation portion 46 that is more likely to be plastically deformed by tension than the other portions of the rod-shaped member 40 in the intermediate portion in the axial direction. The plastic deformation portion 46 has a smaller diameter than the other portions of the rod-like member 40 and is shorter than the cylindrical portion 34 (see FIG. 7). In the present embodiment, both the cylindrical member 30 and the rod-shaped member 40 are made of a metal material. Moreover, the plastic deformation part 46 may be comprised with the metal material (for example, high-tensile steel) with which tensile strength satisfy | fills 490 Mpa.

  Further, the rod-shaped member 40 includes a second male screw portion 48 between the plastic deformation portion 46 and the attachment portion 44. A stopper member 50 is screwed into the second male screw portion 48.

  The stopper member 50 has a cylindrical shape, and an internal thread portion 51 is formed on the inner peripheral surface. The female screw portion 51 is screwed with the second male screw portion 48. Further, the stopper member 50 can be moved with respect to the rod-shaped member 40 to move the position of the stopper member 50 along the axial direction of the rod-shaped member 40. Further, the outer shape of the stopper member 50 is set so that the stopper member 50 can come into contact with the other end portion 34A of the cylindrical portion 34 in the tube axis direction. In the present embodiment, a general nut is used as the stop member. With this configuration, the cost of the brace 20 can be reduced as compared with the case where a dedicated nut is used.

Next, the special nut 36 will be described.
As shown in FIG. 4, the special nut 36 is formed on a cylindrical nut body 52, an elastic ring 54 provided on the inner peripheral side of the nut body 52, and an inner peripheral surface of the elastic ring 54. 42 and a female screw portion 60 that can be screwed together.

  The nut body 52 has a hexagonal outer contour shape, that is, a shape similar to the hexagonal nut, and a circular inner contour shape. An annular elastic ring 54 is attached to the inner peripheral surface of the nut body 52.

  As shown in FIGS. 4 and 5, the elastic ring 54 includes an annular ring portion 56 and a leaf spring portion 58 that is bent so as to have a V-shaped cross section from the end portion 56 </ b> A of the ring portion 56 to the inner peripheral side. And. A plurality (four in this embodiment) of the leaf springs 58 are formed at intervals in the circumferential direction of the ring part 56, and each can be elastically deformed radially outward of the ring part 56. Further, the inner peripheral surface of the elastic ring 54 is configured by the inner surfaces of the plurality of leaf spring portions 58, and the female screw portion 60 is formed across the inner surfaces of all the leaf spring portions 58.

  The special nut 36 is fixed to the cylindrical portion 34 in such a direction that the end portion 56A of the ring portion 56 becomes one end side in the cylinder axis direction. As a result, when the rod-shaped member 40 moves in the insertion direction into the cylindrical member 30, the female screw portion 60 is pressed by the first male screw portion 42, and the plurality of leaf spring portions 58 are elastically deformed radially outward and elastic ring. The inner diameter of 54 increases. On the other hand, when the rod-shaped member 40 moves in the direction of withdrawal from the cylindrical member 30, the female screw portion 60 is pressed by the first male screw portion 42, but the plurality of leaf spring portions 58 are not elastically deformed radially outward. The inner diameter of the elastic ring 54 does not increase.

Next, the assembly procedure of the brace 20 will be described with reference to the drawings.
As shown in FIG. 3, first, one end side of the rod-shaped member 40 is inserted into the cylindrical portion 34 of the cylindrical member 30.

  When the first male screw portion 42 of the rod-shaped member 40 reaches the special nut 36 and further the rod-shaped member 40 is inserted into the tubular member 30, the female screw portion 60 is pressed by the first male screw portion 42, so The leaf spring portion 58 is elastically deformed radially outward to increase the inner diameter of the elastic ring 54. When the inner diameter of the elastic ring 54 increases in this way, the first male threaded portion 42 gets over the female threaded portion 60 of the special nut 36, and the rod-shaped member 40 is allowed to move in the insertion direction into the cylindrical member 30. In addition, after the insertion of the rod-shaped member 40 into the cylindrical member 30 is completed, the first male screw portion 42 and the female screw portion 60 are in a screwed state (see FIG. 6). In this way, the tubular member 30 and the rod-shaped member 40 are connected, and the brace 20 is assembled (see FIG. 7).

  On the other hand, even if an attempt is made to pull out the rod-shaped member 40 from the tubular member 30 in a state where the first male screw portion 42 and the female screw portion 60 are screwed together, the plurality of leaf spring portions 58 are not elastically deformed radially outward. The inner diameter of the ring 54 does not increase, and the screwed state between the first male screw portion 42 and the female screw portion 60 cannot be released. For this reason, the first male screw portion 42 is caught by the female screw portion 60, and the movement of the rod-shaped member 40 in the pull-out direction to the tubular member 30 is prevented.

  In addition, since the cylindrical member 30 and the rod-shaped member 40 can be moved relatively by turning the rod-shaped member 40 with respect to the special nut 36, the length L of the brace 20 can be adjusted.

Next, a procedure for attaching the brace 20 to the structural member 14 will be described with reference to the drawings.
As shown in FIG. 2, first, fixing brackets 22 and 23 are respectively fixed to a pair of corners that are diagonal to the structural member 14.

  Next, the attachment part 32 and the attachment part 44 of the brace 20 assembled in the above assembly procedure are attached to the corresponding fixing brackets 22 and 23, respectively. At this time, the length of the brace 20 is adjusted so that the brace 20 can suppress the deformation of the structural member 14. After the length adjustment, the stopper member 50 is rotated with respect to the rod-shaped member 40, moved along the axial direction of the rod-shaped member 40, and brought into contact with the other end portion 34A of the cylindrical member 30. In this way, the brace 20 is attached to the structural member 14 to form the earthquake resistant structure 10.

Next, the effect of the seismic structure 10 and the brace 20 of this embodiment is demonstrated.
In the following description, the length of the brace 20 in the state shown in FIG. 7 is L, and the length from the special nut 36 to one end in the axial direction of the rod-shaped member 40 is L1.

  As shown in FIG. 2, a force in a direction in which the pair of beams 18 move relatively in parallel with each other (such as a force in a direction in which the fixing bracket 22 and the fixing bracket 23 move in parallel with each other) is received due to shaking during an earthquake. When the compressive force C acts on the brace 20 via the pair of fixing brackets 22, the other end portion 34 </ b> A of the cylindrical member 30 abuts against the stopper member 50, and the insertion direction of the rod-shaped member 40 into the cylindrical member 30. Movement to is prevented.

On the other hand, when a tensile force T acts on the brace 20 via the pair of fixing brackets 22 due to a force in the direction in which the pair of beams 18 move relative to each other in parallel due to shaking during an earthquake, a plurality of leaf spring portions Since 58 does not elastically deform radially outward, the inner diameter of the elastic ring 54 does not increase, the first male screw portion 42 is caught by the female screw portion 60, and the rod-like member 40 is prevented from moving in the direction of withdrawal from the tubular member 30. Is done.
Thereby, it is suppressed that a pair of beam 18 carries out relative movement mutually parallel. That is, the deformation of the structural member 14 is suppressed.

  Here, when the tensile force T acting on the bracing 20 is equal to or greater than a predetermined value, the plastic deformation portion 46 that is most likely to undergo plastic deformation due to tension in the rod-like member 40 is plastically deformed and extended, and the length of the bracing 20 L becomes longer by the elongation L2 of the plastic deformation portion 46 than before the plastic deformation (see FIG. 8).

  Thereafter, when the pair of beams 18 starts to return to their original positions, a compressive force C acts on the brace 20 along with this, and the female screw portion 60 is pressed by the first male screw portion 42, so that the plurality of leaf spring portions 58 have a diameter. The elastic ring 54 is elastically deformed outward in the direction and the inner diameter of the elastic ring 54 is increased. Then, the first male screw portion 42 gets over the female screw portion 60 of the special nut 36, and the rod-shaped member 40 moves in the insertion direction of the rod-shaped member 40 into the cylindrical member 30. At this time, the plastic deformation portion 46 bends in response to the compressive force C. However, since the bent portion is supported in contact with the inner peripheral surface of the cylindrical member 30, plastic deformation such as bending is suppressed.

  When the pair of beams 18 return to their original positions, the other end 34A of the cylindrical member 30 in the cylindrical axis direction comes into contact with the stopper member 50 of the rod-shaped member 40, and the rod-shaped member 40 is moved to the cylindrical member 30. Movement in the insertion direction is prevented. At this time, as shown in FIG. 9, the extension L2 of the plastic deformation portion 46 is added to the length L1 from the special nut 36 to one end of the rod-shaped member 40 in the axial direction. In this way, the elongation L2 obtained by plastic deformation of the plastic deformation portion 46 is adjusted, and the length L of the brace 20 returns to the length before plastic deformation.

  That is, the brace 20 can be returned to the length before plastic deformation even if the length is increased by plastic deformation. Again, when the tensile force T acts on the brace 20 by receiving a force in the direction in which the pair of beams 18 move relative to each other in parallel, the plurality of leaf spring portions 58 are not elastically deformed radially outward. The inner diameter of 54 does not increase, and the first male threaded portion 42 is caught by the female threaded portion 60, and the movement of the rod-shaped member 40 in the direction of withdrawal from the tubular member 30 is prevented. Thereby, even after the bracing 20 returns to the length before plastic deformation, it exerts substantially the same resistance force as before plastic deformation, and suppresses the pair of beams 18 from moving relative to each other in parallel. it can.

  From the above, the bracing 20 always exhibits sufficient resistance against shaking during an earthquake, and can effectively suppress the pair of beams 18 from moving relative to each other in parallel. In the earthquake-resistant structure 10 configured by attaching the brace 20 to the structural member 14, deformation of the structural member 14 is always effectively suppressed.

Further, the stopper member 50 can be moved with respect to the rod-shaped member 40 to move the position of the stopper member 50 along the axial direction of the rod-shaped member 40. That is, the position where the other end portion 34A of the cylindrical member 30 and the stopper member 50 abut can be adjusted. Thereby, the length of bracing can be adjusted freely.
On the other hand, when the tensile strength of the plastic deformation portion 46 satisfies 490 MPa or more, the effect of suppressing the pair of beams 18 from relatively moving in parallel with each other is improved.

(Other embodiments)
In the first embodiment, the elastic ring 54 is arranged on the inner peripheral side of the special nut 36, but the present invention is not limited to this, and the elastic ring 54 may be arranged on the inner peripheral side of the cylindrical portion 34. Good. By setting it as such a structure, the structure of the cylindrical member 30 can be simplified. Moreover, as shown in FIG. 10, it is good also as a structure which arrange | positions the elastic ring 70 in the inner peripheral side of the cylindrical part 34. As shown in FIG. In this elastic ring 70, a plurality of protrusions 72 having a substantially inverted triangular cross section are formed in the axial direction on the inner peripheral surface instead of the female screw portion 60. Note that the first male screw portion 42 of the rod-like member 40 is also preferably an annular protrusion 74 having a substantially triangular cross-section corresponding to the protrusion 72 of the elastic ring 70.

  In the above-described embodiment, the members having elastic force (elastic rings 54 and 70) are arranged on the cylindrical member 30 side. However, the present invention is not limited to this, and elastic force is applied to the rod-like member 40 side. It is good also as a structure which arrange | positions the member which has. For example, as shown in FIG. 11A, a concave portion in which an annular projection 82 having a substantially inverted triangular cross section is formed on the inner circumferential surface of the cylindrical portion 34 and the slide projection portion 84 enters and exits the outer circumferential surface of the rod-shaped member 40. 86 may be formed, and the slide protrusion 84 may be engaged with the protrusion 82. Specifically, the slide protrusion 84 has a substantially triangular cross-sectional shape and is urged outward in the radial direction of the rod-shaped member 40 by a spring 88 disposed between the slide protrusion 84 and the recess 86. Further, as shown in FIG. 11B, when the rod-shaped member 40 moves in the insertion direction into the cylindrical member 30, the slide projection 84 has an inclined surface 84A inward from the inclined surface 82A of the projection 82 radially inward. Under the force, the spring 88 is elastically deformed and slides inward in the radial direction of the rod-shaped member 40. In addition, when the rod-shaped member 40 moves to the tubular member 30 in the withdrawal direction, the slide protrusion 84 does not receive the force inward in the radial direction, and the flat surface 84B contacts the flat surface 82B of the protrusion 82. The rod-shaped member 40 is prevented from moving in the direction of withdrawal from the cylindrical member 30.

  The embodiments of the present invention have been described above with reference to the embodiments. However, these embodiments are merely examples, and various modifications can be made without departing from the scope of the invention. It goes without saying that the scope of rights of the present invention is not limited to these embodiments.

10 Seismic structure 14 Structural member 20 Bracing 22 Fixing bracket (first support part)
23 Fixing bracket (second support part)
30 cylindrical member 34A other end portion 36 special nut 40 rod-like member 42 first male screw portion (first engaging portion)
46 plastic deformation portion 48 second male screw portion 50 stopper member 51 female screw portion 54 elastic ring 58 leaf spring portion 60 female screw portion (second engaging portion)
70 Elastic ring 72 Protrusion (second engaging portion)
74 Protrusion (first engaging portion)
82 Protrusion (second engaging part)
84 Slide protrusion (first engaging portion)
L Length of bracing L2 Elongation of plastic deformation part

Claims (5)

One end is attached to the first support part of the structural member, and the other end is attached to the second support part of the structural member,
A cylindrical member having one end in a cylindrical axis direction attached to the first support;
One end side in the axial direction is inserted into the cylindrical member, the other end portion in the axial direction is attached to the second support part, and the intermediate part in the axial direction and the part inserted into the cylindrical member are more than other parts. A rod-shaped member in which a plastic deformation portion that is prone to plastic deformation due to tension is formed, and a first engagement portion is formed on one end side in the axial direction from the plastic deformation portion;
The cylindrical member is configured to engage with the first engaging portion to prevent the rod-shaped member from moving in the direction of withdrawal from the cylindrical member and to insert the rod-shaped member into the cylindrical member. A second engagement portion that allows movement in a direction;
A stopper provided on the other end side in the axial direction of the plastic deformation portion of the rod-shaped member, and abuts against the other end portion of the cylindrical member in the tube axial direction to prevent the rod-shaped member from moving in the insertion direction. A member,
Bracing with. The inner circumferential portion of the cylindrical member includes an elastic ring configured by annularly arranging a plurality of leaf spring portions that can be elastically deformed radially outward of the cylindrical member,
The first engaging portion is a first male screw portion formed on the outer peripheral surface of the rod-shaped member,
The second engagement portion is a female screw portion that is formed on the inner peripheral surface of the elastic ring and is screwed with the first male screw portion,
The brace according to claim 1, wherein the elastic ring has an inner diameter that is increased by elastically deforming the leaf spring portion radially outward of the cylindrical member when the rod-shaped member is moved in the insertion direction. The rod-shaped member has a second male screw portion formed on the outer peripheral surface on the other end side,
The stopper member has a cylindrical shape, and an internal thread portion is formed on the inner peripheral surface.
The brace according to claim 1 or 2, wherein an internal thread portion of the stopper member is screwed into the second external thread portion.   The brace according to any one of claims 1 to 3, wherein a tensile strength of the plastic deformation portion satisfies 490 MPa or more. A structural member having a first support portion and a second support portion;
The brace according to any one of claims 1 to 4, wherein one end is attached to the first support and the other end is attached to the second support.
Earthquake-resistant structure with

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