JP2015063872A - Brace structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress occurrence of slipping.SOLUTION: A brace structure is arranged in a construction surface surrounded with a pair of right and left longitudinal structure members and a pair of upper and lower lateral structure members. The brace structure comprises: a first brace pair comprising a first lower brace whose lower edge is arranged at a left lower corner part of the construction surface, and a first upper brace whose upper edge is arranged at a right upper corner part of the construction surface; a second brace pair comprising a second lower brace whose lower edge is arranged at a right lower corner part of the construction surface and a second upper brace whose upper edge is arranged at a left upper corner part of the construction surface; and four side frame member. On the four side frame member, the first lower brace is fastened with a pin at a right upper edge part, the first upper brace is fastened with a pin at a left lower edge part, the second upper brace is fastened with a pin at a right lower edge part, and the second lower brace is fastened with a pin at a left upper edge part. The brace structure is deformed in a manner, when the distance between one pair of the diagonal corner parts on the construction surface is reduced, the upper brace of another diagonal brace pair approaches the corner part at the upper edge side and the lower brace approaches the corner part at the lower edge side.

Description

  The present invention relates to a brace structure.

  2. Description of the Related Art A brace structure is known in which bracing is provided in a frame of a frame surrounded by a structural vertical member (for example, a column) and a structural cross member (for example, a beam) to enhance earthquake resistance. When reinforcing the existing frame to incorporate the brace structure, the end of the brace is fixed to the corner of the structural surface by welding or anchoring (bolt joint) in order to be able to withstand tension. There is a need to. For this reason, the construction becomes large, and costs and a construction period are required. Therefore, a brace structure has been proposed in which the end of the brace and the corner of the frame are not required to be fixed by tension (see, for example, Patent Document 1).

JP 2004-270816 A

  However, in the brace structure as described above, when the displacement direction (direction) is switched, there is a possibility that a phenomenon (hereinafter, also referred to as slip) in which the end of the brace is separated from the corner of the composition surface. Further, when using a damper, there is a possibility that energy absorption loss may occur due to slip and vibration damping performance may be deteriorated.

  The present invention has been made in view of such problems, and its main purpose is to suppress the occurrence of slip.

In order to achieve this object, the brace structure of the present invention is a brace structure installed in a construction surface surrounded by a pair of left and right structural vertical members and a pair of upper and lower structural lateral members, And a first brace pair provided at a diagonal on the upper right, a first lower brace arranged at the lower left corner of the composition surface and extending to the upper right, and an upper end on the upper right of the composition surface. A first brace having a first upper brace disposed at a corner and extending to the lower left, and a second brace pair provided at the upper left and lower right diagonals of the construction surface, the lower end of the first brace A second lower brace arranged at the lower right corner of the construction surface and extending to the upper left, and a second upper brace arranged at the upper left corner of the construction surface and extending to the lower right. A second brace pair, and the first lower brace, the first upper brace, and the second brace in the plane of construction. A side brace and a four-side frame member connecting the second upper brace, wherein the four-side frame member is pin-joined with the first lower brace at the upper right corner and the first upper brace at the lower left corner. Are pin-joined, the second upper brace is pin-joined at the lower right corner, and the second lower brace is pin-joined at the upper left corner, and the structural member is displaced by the displacement of the structural longitudinal member and the structural transverse member. When the distance between the corners of one diagonal of the surface is shortened, the upper brace of the other diagonal brace pair is directed to the upper corner of the upper brace and the lower brace is It deform | transforms so that it may face toward the corner part of the lower end side of a side brace, It is characterized by the above-mentioned.
According to such a brace structure, it is possible to apply a compression axial force to each brace regardless of the direction and magnitude of the displacement, and it is possible to prevent a slip from occurring for any displacement. Therefore, the occurrence of slip can be suppressed.

In this brace structure, the first lower brace and the first upper brace are each slidable in the axial direction of the first brace pair, and the second lower brace and the second upper brace are respectively It is desirable that each can slide in the axial direction of the second brace pair.
According to such a brace structure, the four-sided frame material can be easily deformed.

In this brace structure, the four-sided frame member is rectangular before the structural vertical member and the structural cross member are displaced, and is deformed into a parallelogram when the structural vertical member and the structural cross member are displaced. Is desirable.
According to such a brace structure, it is possible to apply a compression axial force to each brace even when the structural vertical member and the structural cross member are displaced.

In this brace structure, it is desirable that the first brace pair and the second brace pair are each provided with a damping member that attenuates vibration of each brace pair.
According to such a brace structure, it is possible to improve the vibration damping performance.

  The damping member may be a friction damper or a viscoelastic damper. Further, it may be a yield damper or a viscous damper. Alternatively, it may be a composite damper formed by combining two to four types of dampers among a friction damper, a viscoelastic damper, a yield damper, and a viscous damper.

  According to the present invention, the occurrence of slip can be suppressed.

It is a schematic explanatory drawing which shows the brace structure of this embodiment. It is a schematic explanatory drawing which shows operation | movement of the brace structure of this embodiment. It is a schematic explanatory drawing which shows the brace structure of a comparative example. It is a schematic explanatory drawing which shows operation | movement of the brace structure of a comparative example. It is a figure which shows the load log | history in the brace structure of a comparative example. It is a conceptual diagram which shows the state at the time of the direction of the load of FIG. 5 switching. It is a figure which shows the load log | history in the brace structure of this embodiment. It is a conceptual diagram which shows the state at the time of the direction of the load of FIG. 7 switching. It is a figure which shows the log | history of the axial force of each brace in this embodiment. It is a figure which shows the specific example of a structure of the brace structure of this embodiment. It is a figure which shows another specific example of a structure of the brace structure of this embodiment. It is a figure which shows the load log | history in case the damper is not provided. It is a figure which shows the log | history of the compression axial force of each brace when the damper is not provided.

=== Embodiment ===
<About brace structure>
FIG. 1 is a schematic explanatory view showing an example of the brace structure of the present embodiment. The vertical direction and the horizontal direction are determined as shown in the figure. The frame 1 is formed by a pair of left and right columns 10 (corresponding to a structural vertical member) and a pair of upper and lower beams 12 (corresponding to a structural cross member), and within a frame surrounded by the columns 10 and the beams 12. A brace structure 20 is provided. Note that the columns 10 and the beams 12 are made of, for example, reinforced concrete.

  The brace structure 20 includes a brace pair 22, a brace pair 23, a four-sided frame member 24, and a slide part 26.

  The brace pair 22 (corresponding to the first brace pair) is provided at the lower left and upper right diagonals of the frame of the frame 1, and the lower brace 22a (corresponding to the first lower brace) and the upper brace 22b (first brace). Equivalent to one upper brace). The lower brace 22a has a lower end disposed at the lower left corner S1 of the frame of the frame 1 and extends to the upper right. The upper brace 22b has an upper end disposed at the upper right corner S2 of the frame of the frame 1 and extends to the lower left.

  The brace pair 23 (corresponding to the second brace pair) is provided at the lower left and upper right diagonals of the frame of the frame 1, and includes a lower brace 23a (corresponding to the second lower brace) and an upper brace 23b (first Equivalent to the second upper brace). The lower brace 23a is disposed at the lower right corner S3 of the frame of the frame 1 at the lower end and extends to the upper right. An upper end of the upper brace 23b is disposed at the upper left corner S4 of the frame of the frame 1 and extends to the lower right.

  As shown in the figure, in the brace pair 22, the lower end of the upper brace 22b is closer to the corner S1 than the upper end of the lower brace 22a, and the upper end of the lower brace 22a is lower than the lower end of the upper brace 22b. It is in a position close to the corner S2. Similarly, in the brace pair 23, the lower end of the upper brace 23b is closer to the corner S3 than the upper end of the lower brace 23a, and the upper end of the lower brace 23a is closer to the corner S4 than the lower end of the upper brace 23b. In position. Each brace pair is provided with a damper (corresponding to a damping member) (not shown) that generates a damping force in the axial direction (extending direction) of the two braces to attenuate the vibration.

  In the brace structure 20 of this embodiment, the upper end and the lower end of each brace pair are not tension-fixed (fixed by anchors, welding, or the like) at the corresponding corners of the frame 1. For this reason, even when the frame 1 is an existing structure, the brace structure 20 can be easily installed.

  The four-way frame member 24 is a rectangular frame member that connects the lower brace 22a, the upper brace 22b, the lower brace 23a, and the upper brace 23b, and each brace is pin-joined at a corner (corner portion). Specifically, the lower brace 22a is pin-joined at the upper right corner of the four-sided frame member 24, and the upper brace 22b is pin-joined at the lower left corner. The lower brace 23a is pin-joined at the upper left corner, and the upper brace 23b is pin-joined at the lower right corner. And when the four-sided frame material 24 receives the stress by each brace, it can deform | transform using a pin junction part as an axis | shaft. In the figure, the four corners of the four-sided frame member 24 are joined to the ends of the braces, but the present invention is not limited to this. For example, the upper end of the lower brace 22a may be closer to the corner S2 than the upper right corner of the four-sided frame member 24.

  The slide part 26 is configured to be slidable in the axial direction while keeping the two braces of each brace pair (the brace pair 22 and the brace pair 23) arranged on the surface of the frame 1 in parallel. A specific configuration example will be described later. The slide part 26 may not be provided.

  FIG. 2 is a schematic explanatory diagram illustrating an example of the operation of the brace structure 20 of the present embodiment. In FIG. 2, the column 10 and the beam 12 of the frame 1 are displaced from the state of FIG. 1 due to a load to the right in the horizontal direction due to an earthquake or the like. When the frame 1 is displaced as shown in the figure, the distance between the corner S3 and the corner S4 of the frame 1 is shortened. Thereby, the lower brace 23a and the upper brace 23b of the brace pair 23 slide in the axial direction of the brace pair 23, the upper end of the lower brace 23a approaches the corner S4, and the lower end of the upper brace 23b is the corner. Approaches part S3. Since the four-sided frame member 24 is pulled so as to spread in the axial direction of the brace pair 23, the lower left corner of the four-sided frame member 24 moves in the upper right direction, and the upper right corner moves in the lower left direction. In other words, the four-sided frame member 24 causes the upper brace 22b of the pair of braces 22 to face the upper right corner S3 and the lower brace 22a to the lower left corner S2. Therefore, the four-sided frame member 24 is deformed from a rectangular state as shown in FIG. 1 to a parallelogram as shown in FIG. For this reason, even when the distance between the corner S3 and the corner S4 is shortened (when the distance between the corner S1 and the corner S2 is increased), the compression axial force is applied to the lower brace 22a and the upper brace 22b. Can work.

  The same applies to the case of displacement to the left in the horizontal direction. That is, in this case, the distance between the corner portion S1 and the corner portion S2 of the frame 1 is shortened, and the distance between the corner portion S3 and the corner portion S4 is increased. By reducing the distance between the corner S1 and the corner S2, the four-sided frame member 24 is deformed so as to spread in the axial direction of the brace pair 22. Thus, the four-sided frame member 24 causes the upper brace 23b of the pair of braces 23 to face the upper left corner S4 and the lower brace 23a to the lower right corner S3. Therefore, in this case, the compression axial force can be applied to the lower brace 23a and the upper brace 23b.

<Comparative example>
FIG. 3 is a schematic explanatory view showing an example of a brace structure of a comparative example. In FIG. 3, parts having the same configuration as in FIG. The brace structure 20 'of the comparative example includes a brace pair 22', a brace pair 23 ', and a four-sided frame member 24'.

  The brace pair 22 'is provided at the lower left and upper right diagonals of the construction surface of the frame 1, and has a lower brace 22a' and an upper brace 22b '. The lower brace 22a 'has a lower end disposed at the corner S1 and extends to the upper right. The upper brace 22b 'has an upper end disposed at the corner S2 and extends to the lower left.

  The brace pair 23 'is provided at the lower left and upper right diagonals of the frame 1 of the frame 1, and has a lower brace 23a' and an upper brace 23b '. The lower brace 23a 'has a lower end disposed at the corner S3 and extends to the upper right. The upper brace 23b 'has an upper end disposed at the corner S4 and extends to the lower right.

  In the comparative example, the lower brace 22a ′ and the upper brace 22b ′ do not overlap in the axial direction, and the lower brace 22a ′ and the upper brace 22b ′ do not overlap in the axial direction. Also in the case of the comparative example, the upper and lower ends of each brace pair are not tension-fixed at the corners of the frame 1.

  The four-sided frame member 24 'is a quadrangular member. In this comparative example, the upper end of the lower brace 22a 'is joined to the lower left corner of the four-sided frame member 24', and the lower end of the lower brace 22a 'is joined to the upper right corner. The upper end of the lower brace 23a 'is joined to the lower right corner of the four-side frame member 24', and the lower end of the upper brace 23b 'is joined to the upper left corner. In addition, the slide part is not provided in brace structure 20 'of this comparative example. In the comparative example, each brace or the four-sided frame member 24 'is provided with a damper mechanism (for example, a friction damper).

  FIG. 4 is a schematic explanatory diagram illustrating an example of the operation of the brace structure 20 ′ of the comparative example.

  Also in the comparative example, the column 10 and the beam 12 of the frame 1 are displaced from the state of FIG. 3 due to a load (force) on the right side in the horizontal direction due to an earthquake or the like. As a result, the distance between the corner S3 and the corner S4 of the frame 1 is shortened. Thus, when the frame 1 is displaced, the four-side frame member 24 ′ is also deformed. However, as can be seen from the figure, the deformed shape of the four-sided frame member 24 ′ of the comparative example is different from the deformed shape of the above-described embodiment, and is deformed into a parallelogram similar to the deformed shape of the frame 1. . That is, the length of the diagonal line in the axial direction of the brace pair 23 'is shortened, and the length of the brace pair 22' in the axial direction (diagonal line direction) is increased. As a result, the lower brace 22a ′ is directed to the corner S1, and the upper brace 22b ′ is directed to the corner S2.

<About load history>
(Comparative example)
FIG. 5 is a diagram illustrating an example of a load history (when a friction damper is used as a damper) in the brace structure 20 ′ of the comparative example. In the figure, the vertical axis represents the load P (kN) applied to the frame 1, and the horizontal axis represents the interlayer displacement δ (mm). Here, the interlayer displacement δ is a displacement amount (distance) from when there is no displacement. The direction of the load P is the plus side when it is on the right side in the horizontal direction, and the minus side when it is on the left side. Further, the direction of the interlayer displacement δ is a positive side when it is on the right side, and a negative side when it is on the left side.

  As shown in the figure, when receiving a load P (a load in the horizontal right direction here) due to an earthquake or the like from a static state (point A in the figure), the distance between the corner S3 and the corner S4 becomes short, A compression axial force is applied to the two braces of the diagonal brace pair 23 '. As a result, the brace is elastically deformed. When the point B is reached, the four-sided frame member 24 ′ starts to deform. From point C, the magnitude of the load P gradually decreases and the magnitude of the displacement also decreases. However, in the case of the comparative example, slip occurs when the direction of the load P changes (here, when the load P changes from the right side to the left side) (points D to D ′ in the figure).

  FIG. 6 is a conceptual diagram showing a state when the direction of the load in FIG. 5 is switched (portion surrounded by a broken line). As shown in the figure, when the direction of the load P changes from the right side to the left side, the lower end of the lower brace 22a ′ of the brace pair 22 ′ of the frame 1 is separated from the corner S1, and the upper end of the upper brace 22b ′ is the corner S2. Away from. That is, at this time, the compression axial force does not act on the lower brace 22a ′ and the upper brace 22b ′.

  Hereinafter, the same history is obtained when the direction of the load P is the left side (minus side). Also in this case, slip occurs when the direction of the load P switches from the left side to the right side (here, slip between the lower brace 23a ′ and the corner S3 and between the upper brace 23b ′ and the corner S4). ) Has occurred (points G to G ′ in the figure).

  Thus, in the brace structure 20 ′ of the comparative example, slip occurs when the direction of the load changes. When slip occurs in this way, energy absorption loss occurs and vibration damping performance decreases.

(This embodiment)
FIG. 7 is a diagram showing an example of a load history in the brace structure 20 of the present embodiment. The vertical and horizontal axes in the figure are the same as in FIG. FIG. 8 is a conceptual diagram showing a state when the direction of the load in FIG. 7 is switched (portion surrounded by a broken line).

  Also in the present embodiment, as shown in FIG. 7, when a load P (here, a load in the horizontal right direction) is received from a static state (point A in the figure) due to an earthquake or the like, the corners S3 and S4 And the compression axial force is applied to the two braces of the pair of braces 23 on the diagonal. As a result, the brace is elastically deformed. When the point B is reached, the four-sided frame member 24 starts to deform. By deforming the four-sided frame member 24, the two braces (the lower brace 22a and the upper brace 22b) of the pair of braces 22 are directed to the corresponding corners. From point C, the magnitude of the load P gradually decreases, and the magnitude of the displacement also decreases.

  In the present embodiment, even when the direction of the load P changes (point D in FIG. 7), the load history is linear. That is, at this time, as shown in FIG. 8, the ends of the two braces (the lower brace 22a and the upper brace 22b) of the brace pair 22 are not separated from the corners of the frame 1 and no slip occurs. For this reason, since the loss of energy absorption does not occur, the vibration damping performance can be improved as compared with the comparative example.

  FIG. 9 is a diagram illustrating an example of the axial force history of each brace in the present embodiment. In the figure, the vertical axis indicates the axial force (kN), and the horizontal axis indicates the interlayer displacement δ (mm). In the figure, the solid line represents the history of the axial force of the brace pair 22 (lower brace 22a, upper brace 22b), and the broken line represents the history of the axial force of the brace pair 23 (lower brace 23a, upper brace 23b). The axial force is positive on the tension side (when receiving a tensile axial force).

  As shown in the figure, the axial force of each brace is negative at all displacements. That is, each brace receives only the compression axial force without receiving the tensile axial force. Therefore, the occurrence of slip can be suppressed regardless of the direction or magnitude of the displacement.

<Specific examples of brace structure>
FIG. 10 is a diagram showing a specific example of the configuration of the brace structure 20 of the present embodiment.

  The brace structure 20 shown in FIG. 10 includes an opening 26 a and a pin 26 b as the slide part 26.

  The opening 26a is formed in each brace of each brace pair along the axial direction. Moreover, the pin 26b is formed in the convex shape at the front-end | tip part of the extension direction of each brace. Then, by inserting the pin 26b of one brace of the pair of braces into the opening 26a of the other brace, the two braces can slide in the axial direction. The slide portion 26 includes a friction damper mechanism. That is, the friction at the time of sliding is changed into thermal energy, and the vibration is attenuated while the friction is applied.

  Further, as shown in the figure, the pin 26b of the lower brace 22a is pin-joined to the upper right corner of the four-side frame member 24, and the pin 26b of the upper brace 22b is pin-joined to the lower left corner of the four-side frame member 24. . The pin 26 b of the lower brace 23 a is pin-joined to the upper left corner of the four-side frame member 24, and the pin 26 b of the upper brace 23 b is pin-joined to the lower right corner of the four-side frame member 24.

  FIG. 11 is a diagram showing another specific example of the configuration of the brace structure 20 of the present embodiment. The brace structure 20 shown in FIG. 11 includes a band 26 c as the slide portion 26. Furthermore, a damper 28 is provided.

  In each brace, two sets of bands 26c are provided on the tip side from the center, and are formed so as to surround a pair of braces. For example, in the brace pair 22, a band 26c formed on the lower brace 22a surrounds the upper brace 22b in a slidable manner. A band 26c formed on the upper brace 22b surrounds the lower brace 22a so as to be slidable. As a result, the two braces of the brace pair can slide in the axial direction with respect to each other.

  Also in this example, the lower brace 22 a is pin-joined to the upper right corner of the four-side frame member 24, and the upper brace 22 b is pin-joined to the lower left corner of the four-side frame member 24. The lower brace 23 a is pin-joined to the upper left corner of the four-side frame member 24, and the upper brace 23 b is pin-joined to the lower right corner of the four-side frame member 24.

  The damper 28 is between the lower brace 22a and the corner S2, between the upper brace 22b and the corner S1, between the lower brace 23a and the corner S4, and between the upper brace 23b and the corner S3. Are provided respectively. The damper 28 is, for example, an oil damper (viscous damper) that attenuates vibration between two members that are relatively displaced using oil that is a viscous fluid.

  As described above, the brace structure 20 of the present embodiment includes two braces provided at diagonal angles in the frame 1 of the frame 1 surrounded by the pair of left and right columns 10 and the pair of upper and lower beams 12. A pair (brace pair 22, brace pair 23) and a four-sided frame member 24 for connecting the braces are provided. The brace pair 22 is provided at the lower left corner and the upper right corner of the construction surface. The lower brace 22a is disposed at the corner S1 and extends to the upper right, and the upper end is disposed at the corner S2 and extends to the lower left. And an upper brace 22b. Further, the brace pair 23 is provided at the upper left and lower right diagonals of the construction surface, the lower end is disposed at the corner S3 and the upper side is disposed at the corner S4. And an upper brace 23b extending to the lower right.

  Further, the lower brace 22a is pin-joined at the upper right corner of the four-sided frame member 24, the upper brace 22b is pin-joined at the lower left corner, and the upper brace 23b is pin-joined at the lower right corner, and the upper left corner. The lower brace 23a is pin-joined. When the distance between the corners of one diagonal of the structural surface is shortened due to the displacement of the frame 1, the four-sided frame member 24 connects the upper brace of the other diagonal brace pair to the upper end side of the upper brace. The lower brace is deformed so as to face the corner and to the corner on the lower end side of the lower brace.

  By so doing, it is possible to apply a compression axial force to each brace regardless of the direction and magnitude of the displacement, and to prevent slippage from occurring for any displacement. Therefore, the occurrence of slip can be suppressed.

=== About Other Embodiments ===
The above embodiment is for facilitating the understanding of the present invention, and is not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and it is needless to say that the present invention includes equivalents thereof. In particular, the embodiments described below are also included in the present invention.

<About damper>
In the above-described embodiment, the friction damper and the viscous damper (damper 28) are used. However, the present invention is not limited to this, and other dampers may be used. For example, a viscoelastic damper such as rubber may be used. Alternatively, a yield damper that buckles with a predetermined load may be used. Or you may use the composite damper which combined 2 or more types (2 types-4 types) damper of a friction damper, a viscous damper, a viscoelastic damper, and a yield damper.

  Further, the damper may not be provided.

  FIG. 12 is a diagram illustrating an example of a load history when no damper is provided. In the figure, the vertical axis represents the load P (kN), and the horizontal axis represents the interlayer displacement δ (mm). Further, in the figure, the broken line indicates the load history when the frame 1 alone (no brace), and the solid line indicates the load history when the brace structure 20 without damper is provided on the frame 1. As can be seen from the figure, the magnitude of the interlayer displacement δ is smaller when the brace is applied to the predetermined load P.

  FIG. 13 is a diagram illustrating an example of the history of the compression axial force of each brace when no damper is provided. In the figure, the vertical axis indicates the axial force (kN), and the horizontal axis indicates the interlayer displacement δ (mm). In the figure, the solid line represents the history of the axial force of the brace pair 22 (lower brace 22a, upper brace 22b), and the broken line represents the history of the axial force of the brace pair 23 (lower brace 23a, upper brace 23b). The axial force is positive on the tension side (when receiving a tensile axial force).

  As shown in the figure, as the absolute value of the displacement increases, the axial force of each brace increases toward the compression side, and the axial force of each brace becomes negative at all displacements. That is, when a displacement occurs, each brace receives only a compression axial force, not a tensile axial force. Therefore, the occurrence of slip can be suppressed without using a damper regardless of the direction or magnitude of the displacement.

<About the four-sided frame material>
In the above-described embodiment, the four-sided frame member 24 is rectangular (rectangular), but may be square. For example, when the construction surface of the frame 1 is a square, the four-sided frame member 24 is also a square. A square is a special shape of a rectangle (a shape in which all four sides have the same length). In this case, when the frame 1 is displaced, the four-sided frame member 24 is deformed into a rhombus. The rhombus is a special shape of a parallelogram.

1 frame 10 pillar 12 beam 20 brace structure 22 brace pair 22a lower brace 22b upper brace 23 brace pair 23a lower brace 23b upper brace 24 four-sided frame material 26 slide part 26a opening part 26b pin 26c band 28 damper

Claims (9)

A brace structure installed in a construction surface surrounded by a pair of left and right structural vertical members and a pair of upper and lower structural cross members,
A first brace pair provided at the lower left and upper right diagonals of the surface,
A first lower brace having a lower end disposed in a lower left corner of the composition surface and extending to the upper right; and a first upper brace having an upper end disposed in the upper right corner of the composition surface and extending to the lower left. A first brace pair having,
A second brace pair provided at the upper left and lower right diagonals of the surface;
A second lower brace having a lower end arranged in the lower right corner of the construction surface and extending to the upper left, and a second upper brace arranged in an upper left corner of the construction surface and extending to the lower right. A second brace pair having,
A four-sided frame material connecting the first lower brace, the first upper brace, the second lower brace, and the second upper brace in the composition surface,
With
The four-sided frame material is
The first lower brace is pinned to the upper right corner, the first upper brace is pinned to the lower left corner, the second upper brace is pinned to the lower right corner, and the second upper brace is The lower brace is pin-joined, and when the distance between the diagonal corners of the structural surface is shortened due to the displacement of the structural longitudinal member and the structural lateral member, the other brace pair of the other diagonal The upper brace is deformed so as to face the corner on the upper end side of the upper brace and the lower brace is directed to the corner on the lower end side of the lower brace.
Brace structure characterized by that. The brace structure according to claim 1,
The first lower brace and the first upper brace are each slidable in the axial direction of the first brace pair, and the second lower brace and the second upper brace are each of the second brace pair. Slidable in the axial direction,
Brace structure characterized by that. The brace structure according to claim 1 or 2,
The four-sided frame member is rectangular before the structural vertical member and the structural cross member are displaced, and is deformed into a parallelogram when the structural vertical member and the structural cross member are displaced,
Brace structure characterized by that. A brace structure according to any one of claims 1 to 3,
The first brace pair and the second brace pair are each provided with a damping member that attenuates the vibration of each brace pair. The brace structure according to claim 4,
The damping member is a friction damper,
Brace structure characterized by that. The brace structure according to claim 4,
The damping member is a viscoelastic damper.
Brace structure characterized by that. The brace structure according to claim 4,
The damping member is a yield damper;
Brace structure characterized by that. The brace structure according to claim 4,
The damping member is a viscous damper,
Brace structure characterized by that. The brace structure according to claim 4,
The damping member is a composite damper formed by combining two to four kinds of dampers among a friction damper, a viscoelastic damper, a yield damper, and a viscous damper.
Brace structure characterized by that.

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