JP6695686B2 - Buckling restraint brace damper - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a buckling restrained brace damper for absorbing energy by plastically deforming a steel material and damping the sway of a structure.

  BACKGROUND ART Conventionally, a brace damper is installed inside a frame of a building in order to absorb and damp vibration energy that has acted on the building due to an external disturbance such as an earthquake or a strong wind, and to impart damping performance to the building. As one of the brace dampers of this type, a buckling restrained brace damper is known in which a steel material excellent in energy absorption capacity is used as a core material and a stiffening material is provided so as to surround the core material. .. Such a buckling restrained brace damper (hereinafter simply referred to as a brace damper) absorbs an external force (vibration energy such as seismic energy) acting in the axial direction of the brace by plastic deformation of the core material, and at the same time, the stiffening material Buckling of the material can be prevented, and the core material can be efficiently plastically deformed. This makes it possible to exhibit excellent vibration damping performance and effectively improve the vibration resistance of the building.

  Then, in the above-described brace damper, as shown in FIG. 11A, when a high compression axial force N is applied, the core material 100 is a gap (clearance S) between the buckling restraint material 101 and the core material 100. A high-order buckling phenomenon is occurring. Here, the force by which the core material 100 tries to spread the buckling restraint material 101 in the direction orthogonal to the material axis due to the buckling of the core material 100 is called stiffening force B. It is known that the stiffening force B is represented by a buckling waveform as a sin θ component of the axial force N by the formula of B = 2N × sin θ = 2N × S / Lm (Lm: buckling half wavelength). (See, for example, Non-Patent Document 1). Therefore, the buckling restraint member 101 is set so as to secure bending rigidity against overall buckling and not to collapse against the stiffening force B.

  By the way, in the case where the core material has a rectangular cross-sectional shape, when the axial force is repeatedly applied to the brace damper, the buckling half-wavelength becomes small at the movable end of the brace, as shown in FIG. It is known that the bending amplitude becomes large. That is, the stiffening force B increases in inverse proportion to the buckling wavelength and in proportion to the buckling amplitude according to the above equation, and promotes the collapse of the buckling restraint member 101 at that portion. For example, when the buckling half-wavelength Lm becomes 1/2 at the movable end of the brace, the stiffening force B is doubled, and the number of nodes of the core member 100 and the buckling restraint member 101 is double that of the general portion. Therefore, at the movable end of the brace, a stiffening force B that is four times that of the general portion acts. Further, since the buckling restraint member 101 cannot be a rigid body and spreads in the out-of-plane direction to increase the clearance S shown in FIG. Lead to. As a result, strain concentration occurs at the movable end of the core material 100, which deteriorates the fatigue performance and makes it impossible to obtain sufficient energy absorption performance.

  Further, the higher-order buckling phenomenon of the core material generated by the high axial force also increases the number of contacts between the buckling restraint material and the core material and reduces the buckling half-wavelength even in the general part. Stiffening power also increases. As a result, the frictional force f between the buckling restraint material and the core material (see FIG. 11B)) becomes large, and a part of the axial force flows to the buckling restraint material, and sufficient energy absorption performance is obtained in the core material. In addition, there was a problem that the buckling restraint was displaced.

As a brace damper that copes with the problem that the stiffening force of the end portion of the core material increases, a structure in which reinforcing ribs are attached to the end portion of the flat plate core material so as to have a cross-shaped cross section, and FIGS. ), A steel plate 111 is joined to both side surfaces of the end 110a of the core material 110 so that higher-order buckling does not occur at the end of the core material (for example, see Patent Document 1). ..
Further, in Patent Document 2, by locking a convex portion provided at a central portion in the axial direction of the core material and a concave portion at a central portion in the material axial direction of the buckling restraint material, the core material with respect to the buckling restraint material is locked. The configuration for preventing the movement (shift) in the axial direction is described.

"Buckling restraint design and performance confirmation experiment of cane damper", Inoue et al., Steel Structures, Vol. 12, No. 45, 2005.3

JP, 10-306498, A JP, 2002-138583, A

However, the conventional brace damper has the following problems.
That is, in the case of a structure in which a reinforcing rib having a cross-shaped cross section is provided at the end of the core material, it is necessary to provide a slit extending in the axial direction at the end of the buckling restraint so that the reinforcing rib does not interfere with the buckling restraint. As a result, there is a problem in that the strength of the end portion of the buckling restraint member that requires a large stiffening force is reduced, and a sufficient restraining effect cannot be obtained.
Further, in Patent Document 1, in order to secure the out-of-plane bending rigidity equivalent to that of the above-described reinforcing rib, a corresponding plate thickness is required, the cross section of the brace becomes large, and the cost increases, so that point is improved. There was room for
Further, in Patent Document 2, since it is necessary to form a hole in the center of the buckling restraint material and to form a convex shape in the center of the core material, and both ends of the buckling restraint material are movable, the cost is reduced. There was a problem that

  The present invention has been made in view of the above-mentioned problems, and a buckling restraint brace capable of obtaining a sufficient stiffening effect without increasing the size of the cross section of the brace, being easy to manufacture and being low in cost. The purpose is to provide a damper.

In order to achieve the above object, a buckling restraint brace damper according to the present invention includes a core material, a buckling restraint material for preventing buckling of the core material, and a space between the core material and the buckling restraint material. And a plasticizing portion that extends along the axial direction and plastically deforms to absorb the vibration energy when the vibration energy acts, and the core material in the axial direction. A pair of joints respectively provided on both end sides for connecting to the frame of the building, and the buckling restraint members are laminated and arranged so as to sandwich the core member and the insulating member, and the core member. A pair of constraining plates for constraining the out-of-plane deformation of the plasticized portion of the, and the bridge is connected to the pair of constraining plates, and is arranged so as to surround the core together with the pair of constraining plates, A pair of cover plates for restraining the in-plane deformation of the plasticized portion of the material, and the pair of restraint plates are connected to each other, and the pair of restraint plates, the core material, and the insulating material are arranged so as to sandwich them, and the entire bending is performed. A pair of stiffening members made of channel steel for enhancing rigidity, wherein one end of the buckling restraint member in the axial direction is a fixed end portion, and one of the pair of joint portions of the core member is fixed. While being fixed to the side joint portion, the other end in the axial direction is a movable end portion, and the other movable side joint portion is movably provided along the axial direction and is provided on the groove opening side of the stiffening material. Vertical ribs and horizontal ribs are provided on the inner side, the horizontal ribs are provided at least on the movable end side of the stiffening material, and the respective rib ends of the vertical ribs and the horizontal ribs are side surfaces of the restraint plate. The cover plate is abutted in a non-fixed state, and a concave portion that opens to the movable end side is formed at the end of the cover plate on the movable end side .

In the present invention, when the vibration energy acts from the frame of the building, an external force (vibration energy such as seismic energy) acting in the axial direction of the brace is absorbed by plasticizing the plasticizing portion of the core material. At this time, the core material is surrounded by the pair of constraining plates of the buckling constraining material and the pair of cover plates, and the pair of stiffening members reinforced by the vertical ribs and the horizontal ribs are the pair of constraining plates, the core material and the insulating material. The buckling restraint member can be reliably prevented from opening in the out-of-plane direction at both ends due to the axial deformation of the brace. In other words, the stiffening material increases the bending rigidity of the entire brace and suppresses buckling of the entire brace. In addition to the vertical ribs, horizontal ribs are provided on the movable end side of the stiffening material. The effect of buckling restraint of the movable side end of the core material can be further enhanced by being integrated with.
As described above, in the present invention, the out-of-plane deformation and the in-plane deformation of the core material are restrained, the buckling of the core material can be prevented, the core material can be efficiently plastically deformed, and the opening in the out-of-plane direction is suppressed. There is.
Since the stiffening material can prevent the entire buckling and the local collapse of the buckling restraint material, the fatigue life of the core material can be extended and the energy absorption performance can be improved.

  Further, since the insulating material is interposed between the plasticized portion of the core material and the constraining plate, the frictional force acting between the core material and the constraining plate can be reduced. Therefore, in the buckling restrained brace damper of the present invention, excellent vibration damping performance is exhibited, and the vibration resistance of the building can be effectively improved.

Furthermore, since the vertical ribs and horizontal ribs are provided inside the stiffener, the ribs can be welded inside with the open end side of the channel steel facing up during manufacturing, which facilitates welding work. Therefore, the cost required for the work can be reduced. Moreover, since the vertical ribs and the horizontal ribs are in contact with the side surfaces of the restraint plate in a non-fixed state, welding between the restraint plate and the ribs is unnecessary, and the cost for welding work can be suppressed.
Further, unlike the conventional structure, the end portion of the core material is not reinforced with ribs, so that it is possible to increase the axial length of the plasticized portion of the core material, which extends the fatigue life of the core material and increases energy consumption. The absorption performance can be improved.
Further, in the present invention, by adopting such a configuration, the concave portion of the cover plate can be processed into, for example, a U shape, and the welding length of the cover plate and the restraint plate at the movable end can be made long. Therefore, the end stiffening force can be increased, and the restraining effect can be maintained without breaking the stiffening material.

Further, in the buckling restraint brace damper according to the present invention, the fixed side joint portion of the core member is adjacent to the fixed end portion of the buckling restraint member, and the buckling restraint member to the fixed side joint portion side. It is preferable that the shear key that restricts the movement of the is fixed.

  In this case, when the compressive load acts on the core material by abutting the fixed end of the restraint plate, it is possible to prevent the buckling restraint material from being displaced in the axial direction against the compressive load of the core material. It is desirable to install a shear key that can be used at the fixed side joint of the core material. Thereby, the buckling restraint effect of the core material can be kept constant. Moreover, since the shear key can be attached from the outside of the brace damper by a simple operation, an increase in cost due to installation can be suppressed.

  Further, in the buckling restraint brace damper according to the present invention, it is preferable that joining bolts are provided at both ends of the restraint plate so as to pass through the core material, the restraint plate, and the insulating material to be fastened.

  In this case, since the core material, the constraining plate and the insulating material are joined by the joining bolts at both ends of the constraining plate, it is possible to prevent the constraining plate from opening in the out-of-plane direction.

Further, in the buckling restraint brace damper according to the present invention, even if the movable-side joint portion of the core member located on the movable end portion side has a widened portion having a width dimension larger than that of the plasticized portion. Good.

In this case, a recess is formed at the movable end of the cover plate, so that the plasticized portion of the core material is deformed, and when the entire brace expands or contracts, the expanded portion of the core material and the cover plate Interference can be avoided.
Further, in order to prevent the restraint plate from opening in the out-of-plane direction, the core material is passed through the restraint plate and the insulating material and fastened.

  According to the buckling restrained brace damper of the present invention, a sufficient stiffening effect can be obtained without enlarging the cross section of the brace damper, and the manufacture can be facilitated and the cost can be reduced.

It is a top view which shows the structure of the brace damper by embodiment of this invention. It is a front view of the brace damper shown in FIG. It is sectional drawing of the brace damper shown in FIG. 2, (a) is an AA line sectional view, (b) is a BB line sectional view, (c) is a CC sectional view, (d) is It is a DD line arrow line view. It is a side view which shows each part of a brace damper, (a) is a figure of a center core material, (b) is a figure of an outer core material, (c) is a figure of a cover plate, (d) is a figure of a restraint plate. , (E) are views of the stiffening material. It is a principal part enlarged view which shows the movable side of the brace damper shown in FIG. It is a principal part enlarged view which shows the movable side of the brace damper shown in FIG. FIG. 7 is a view taken along the line EE shown in FIG. 6, and is a side view of the brace damper seen from the movable side. FIG. 6 is a cross-sectional view taken along the line FF shown in FIG. 4E, which is a cross-sectional view showing a movable side end portion of the stiffening material. It is a figure which shows the load deformation relation by an Example. It is a figure which shows the load deformation relation by an Example. (A), (b) is a figure which shows the state of buckling deformation | transformation of the core material of buckling restraint brace, and the relationship of the axial force and stiffening force of a core material. It is a figure which shows the stiffening state of the conventional core material, (a) is the front view, (b) is the top view.

  Hereinafter, a buckling restraint brace damper according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, a buckling restrained brace damper (hereinafter, simply referred to as a brace damper 1) according to the present embodiment absorbs and attenuates vibration energy that acts on a building during an earthquake, for example, and shakes the building. It is to suppress the.

The brace damper 1 includes a core material 2 that absorbs and attenuates vibration energy such as seismic energy applied to a building, a buckling restraint material 3 for preventing the core material 2 from buckling, a core material 2 and a buckling material. And an insulating material 4 disposed between the restraint materials 3.
Here, in the brace damper 1, it is one end side along the axis O1 direction of the core material 2 (here, the left side of the paper surface shown in FIGS. 1 and 2) and the axis O1 of the buckling restraint material 3 with respect to the core material 2. The side that fixes the movement in the direction is called the fixed side, and is the other end side (the right side of the paper surface shown in FIGS. 1 and 2) on the opposite side, and is the axis O1 of the buckling restraint member 3 with respect to the core member 2. The side that allows movement in that direction is called the movable side. In the core material 2, a direction orthogonal to the axis O1 direction in the front view shown in FIG. 2 is referred to as a width direction W.

The core material 2 is formed by integrally laminating three steel plates. That is, the core material 2 is composed of a central core material 2A and outer core materials 2B and 2B which are sandwiched from one surface side and the other surface side of the central core material 2A, respectively.
The central core member 2A and the outer core members 2B and 2B are provided along the axis O1 direction of the brace damper 1 as shown in FIGS. 3 (a) to 3 (d) and FIGS. 4 (a) and 4 (b). And a plasticizing portion 21 that is formed into a flat strip shape with a constant width dimension and plastically deforms when the vibrational energy acts to absorb the vibrational energy, and integrally on both end sides of the plasticizing portion 21. The widened portion 22 (22A, 22B) that is provided and is not expected to be plasticized is provided.
The core material 2 is welded only in the widened portion. Since welding to the plasticized portion is not involved, adverse effects on the fatigue life of the core material can be avoided.

The widened portions 22A and 22B are continuously extended from the plasticizing portion 21 to the outside in the direction of the axis O1 and have a shape widened to a larger width than the plasticizing portion 21.
The widened portion 22 is part of the joint portion 23 (23A, 23B) having an H-shaped cross section for constructing the brace damper 1 in the frame by bolting to a gusset plate or the like attached to the frame of the building (on the web). Corresponding to the first bolt hole 22a, which penetrates from one surface to the other surface.

As shown in FIGS. 1 and 2, one of the pair of joint portions 23 of the core member 2 is the fixed-side joint portion 23A that fixes the buckling restraint member 3 in the direction of the axis O1 and the other is the joint portion 23. The buckling restraint member 3 is a movable-side joint portion 23B that is movably provided along the direction of the axis O1.
The joint portion 23 is orthogonal to the widened portion 22 of the core material 2 and is integrally formed on both ends in the width direction W of the widened portion 22 by partial or complete penetration welding S1 (see FIG. 3 (d) and FIG. 7). It has a pair of flange portions 24, 24 joined to each other and is formed in an H-shaped cross section.
Each flange portion 24 is formed with a plurality of second bolt holes 24a for joining to a gusset plate or the like and penetrating from one surface to the other surface. Further, in the core material 2, a portion connecting the plasticizing portion 21 and the widening portion 22 is formed in a concave arc shape.
When the brace damper 1 is installed by welding without joining the joint portion 23 to the frame of the building by bolts, the bolt holes 22a and 24a are unnecessary.

  Further, the central core material 2A and the outer core material 2B are, as shown in FIGS. 1, 3 (b), 4 (a), (b), and 5, the plasticizing portion 21 side of each widening portion 22. Joint holes 25 and 26 for joining the buckling restraint member 3 are formed so as to penetrate from one surface to the other surface. One fixed side widened portion 22A (left side of FIG. 4A) has two first joining holes 25, and the other movable side widened portion 22B (right side of FIG. 4A). Is provided with four second bonding holes 26.

  Further, as shown in FIGS. 4 (a) and 4 (b), the widened portion 22 of the outer core material 2B is formed to have a length that is approximately half of the widened portion 22 of the central core material 2A in the axis O1 direction. There is. Then, as shown in FIGS. 3B and 5, the ends of the outer core materials 2B and 2B are completely melted into the central core material 2A by welding S4 (see FIG. 3C) and fillet welding S2 (see FIG. 3B). 5)) and is integrally formed.

  Moreover, as shown in FIGS. 1 and 2, the outer surface of the pair of fixed-side widened portions 22A of the outer core material 2B extends along the width direction W at a predetermined position in the axis O1 direction, and extends outside the outer surface. A shear key 8 projecting toward the side is provided by welding. The shear key 8 is provided so that the fixed end portion 5a on the fixed side joint portion 23A side is adjacent in the axis O1 direction of the restraint plate 5.

  As shown in FIGS. 1 and 3A and 3B, the insulating material 4 is made of rubber or the like and is formed into a rectangular flat strip shape. The insulating material 4 is formed such that the width dimension thereof is substantially equal to the width dimension of the plasticizing portion 21 of the core material 2, the length in the direction of the axis O1 is larger than the length of the plasticizing portion 21 of the core material 2, 2 is formed with a size smaller than the entire length. Further, the insulating material 4 has third joining holes 41 formed at both ends in the direction of the axis O1 so as to penetrate from one surface to the other surface. Then, the pair of insulating materials 4 are disposed so as to be in layer contact with the core material 2 so as to be in surface contact with each other while allowing the bonding holes 25, 26, 41 to communicate with each other.

  As shown in FIGS. 1 and 2, the buckling restraint member 3 is laminated on one surface side and the other surface side of the core member 2 and extends in the direction of the axis O1 to restrain the out-of-plane deformation of the core member 2. A pair of constraining plates 5 and a pair of constraining plates 5 which are connected and erected on both side ends in the width direction W and extend in the direction of the axis O1 to constrain in-plane deformation of the core 2. A cover plate 6 and a pair of stiffening members 7 that are provided integrally with each restraint plate 5 and that extend along the restraint plates 5 in the direction of the axis O1 and mainly enhance the overall bending rigidity of the brace damper 1 are provided. ing.

  The pair of constraining plates 5 shown in FIG. 4 (d) are rectangular flat plate-shaped and strip-shaped steel plates of the same shape and size, and are formed to have a width substantially equal to the width of the plasticized portion 21 of the core material 2. Has been done. Further, each restraint plate 5 is formed such that the length in the direction of the axis O1 is larger than the length of the plasticized portion 21 of the core material 2 and smaller than the entire length of the core material 2.

  Furthermore, each restraint plate 5 is penetrated from one surface to the other surface at both end sides in the direction of the axis O1 and corresponds to the first bonding hole 25 and the second bonding hole 26 of the core material 2 shown in FIG. 1, respectively. A joining circular hole 51 and a joining elongated hole 52 which communicate with each other are provided. Further, the joining circular hole 51 provided at one end of each restraint plate 5 (on the left side of the paper in FIG. 4D) is formed as a round hole, and on the other end (on the right side of the paper in FIG. 4D). The joint elongated hole 52 provided is formed as an elongated hole extending along the direction of the axis O1.

  The pair of constraining plates 5 and 5 are disposed so as to be laminated on one surface side and the other surface side of the core material 2 so as to sandwich the core material 2 and the pair of insulating materials 4, respectively, and one end portion in the direction of the axis O1. The joining circular hole 51 on the side is communicated with the joining holes 25, 41 of the core material 2 and the insulating material 4, and the joining elongated hole 52 on the other end side is communicated with the joining holes 26, 41 of the core material 2 and the insulating material 4. Are installed. Further, each restraint plate 5 is joined to the core material 2 by inserting a joining bolt 50 such as a binding bolt into the joining holes 25, 26, 41, 51, 52 and fastening a nut. At this time, each restraint plate 5 is inserted into the core material 2 by inserting the joining bolt 50 into substantially the center of the joining elongated hole 52 on the other end side in the direction of the axis O1 when the brace damper 1 is installed on the frame of the building. It is connected.

  The pair of cover plates 6 shown in FIG. 4 (c) are rectangular flat plate-shaped and strip-shaped steel plates of the same shape and size, and the length in the direction of the axis O1 is equal to the length of the plasticized portion 21 of the core material 2, Alternatively, it is formed to be short. Further, one cover plate 6 is disposed on one end side of the pair of restraint plates 5 in the width direction W, and the other cover plate 6 is disposed on the other end side thereof. Then, each cover plate 6 has sufficient strength against the stiffening force generated outside the plane of the core material 2 and outside the plane of the restraint plate 5 so that the side ends of the pair of restraint plates 5 are connected to each other. As it has, it is connected and installed by fillet welding S3 (refer FIG. 3 (a), (b)).

  Thereby, in the brace damper 1 of the present embodiment, the buckling restraint member 3 is formed in a box shape in cross section by the pair of restraint plates 5 and 5 and the pair of cover plates 6 and 6. 5 and a pair of cover plates 6, 6 are formed so that the core material 2 and the insulating material 4 are housed inside and surrounded by the constraining plate 5 and the cover plate 6.

  Further, as shown in FIG. 5, a U-shaped concave portion 6a that opens to the movable side is formed at the movable side end of the cover plate 6. As a result, the welding length of the restraint plate 5 and the cover plate 6 can be set to be large, and the strength of the movable end can be increased. Since the recess 6a is U-shaped, stress concentration can be relaxed.

  The pair of stiffening members 7 shown in FIGS. 4E and 6 is a channel steel having a web 71 and a pair of flanges 72, respectively, and is disposed with the groove opening side facing the core member 2 side. .. Each stiffening member 7 is formed to have a width dimension slightly smaller than the width dimension of the restraint plate 5 and a length in the direction of the axis O1 substantially equal to the length of the restraint plate 5. ..

  The pair of stiffening members 7 are respectively arranged on the one restraint plate 5 side and the other restraint plate 5 side so as to sandwich the core member 2, the pair of insulating members 4, and the pair of restraint plates 5, and at the same time, the axis line. It is extended in the O1 direction. Further, as shown in FIG. 3 (b), each stiffening member 7 has a pair of flanges 72 so that the stiffening member 7 has sufficient strength against the shearing force generated by the overall buckling of the buckling restraint member 3. The end portions are joined to the restraint plate 5 by fillet welding S3 (see FIGS. 3A and 3B) and are integrally arranged. Further, as shown in FIG. 6, a hand hole 73 is formed through the webs 71 on both end sides of each stiffening member 7, and a rotary tool such as a socket wrench is inserted through the hand hole 73 to join them. The bolt 50 and the nut can be operated.

In addition, inside the groove opening side of the stiffening member 7, a vertical rib 74 extending along the width direction W is joined to an intermediate portion in the width direction W of the vertical rib 74 on the movable side joining portion 23B side. Lateral ribs 75 and are provided. As shown in FIG. 3B, the vertical ribs 74 and the horizontal ribs 75 have a height dimension in which the rib ends 74 a, 75 a in the direction orthogonal to the width direction W are located on the same plane as the opening end 7 a of the stiffening member 7. (Dimensions from the web 71 of the stiffening member 7 to the rib ends 74a, 75a in the orthogonal direction) are set.
The vertical ribs 74 and the horizontal ribs 75 are fixed to the web 71 and the flange 72 by welding. When joining the stiffening member 7 and the restraint plate 5, the inner end surfaces 7 a of the vertical ribs 74 and the horizontal ribs 75 facing inward in the width direction W are in contact with the outer surface of the restraint plate 5. As a result, the vertical ribs 74 and the horizontal ribs 75 are integrated with the restraint plate 5, and the buckling restraint effect of the core material 2 can be enhanced.

Note that the number of the joining bolts 50 is determined according to the stiffening force. In the present embodiment, two are on the fixed side and four are on the movable side having a large stiffening force with the lateral ribs 75 of the stiffening member 7 sandwiched therebetween. I am trying. The joining bolt 50 on the movable side, which has a particularly large stiffening force, can be said to be a particularly important component for enhancing the buckling restraint effect.
When a long hole is provided at the movable end of the restraint plate 5 as in this embodiment, a large washer (not shown) is used, and polytetrafluoroethylene is provided between the buckling restraint 3 and the washer. It is preferable to insert a friction reducing material such as a resin sheet.

Here, a method for manufacturing the above-described brace damper 1 will be described.
As shown in FIGS. 1 and 2, first, the shapes of the central core member 2A and the outer core member 2B, the bolt holes, and the joining holes 25 and 26 are processed. Then, a flange is welded to the widened portions 22A and 22B of the central core material 2A to form a flange portion 24. Then, the insulating material 4 is attached to the inner surface of the restraint plate 5 with, for example, a double-sided adhesive tape or the like. After that, the restraint plate 5 and the core material 2 are fixed by inserting the joining bolts 50 into the respective bolt holes and joining holes.
After that, the cover plates 6 are connected to both ends of the restraint plate 5 in the width direction W by welding. Further, as shown in FIG. 8, inside the groove opening side of the stiffening member 7, vertical ribs 74 and horizontal ribs 75 are welded at predetermined positions by fillet welding S4 (see FIG. 8), and then the stiffening member 7 is welded. 7 is extended in the constraining plate 5 in the direction of the axis O1 and integrated by fillet welding S3 (see FIGS. 3A and 3B).

As described above, in the brace damper 1 according to the present embodiment, as shown in FIGS. 1 and 2, when vibration energy acts from the frame of the building, an external force (earthquake) acting in the direction of the axis O1 of the brace damper 1 is generated. Vibration energy such as energy) is absorbed by plasticizing the plasticizing portion 21 of the core material 2.
At this time, the core member 2 is surrounded by the pair of restraint plates 5 and the pair of cover plates 6 of the buckling restraint member 3, and the pair of stiffener members 7 reinforced by the vertical ribs 74 and the horizontal ribs 75 restrain the pair of restraint members 7. Since the plate 5, the core member 2, and the insulating member 4 are arranged so as to sandwich the plate 5, the buckling restraint member 3 is prevented from reliably opening in the out-of-plane direction at both ends due to the deformation of the brace damper 1 in the direction of the axis O1. can do. That is, the stiffening member 7 enhances the bending rigidity of the entire brace and suppresses the buckling of the entire brace. In particular, the movable end of the stiffening member 7 is provided with the horizontal rib 75 in addition to the vertical rib 74. Therefore, the buckling restraint effect of the movable side end of the core member 2 can be further enhanced by being integrated with the restraint plate 5.

As described above, in the present embodiment, the out-of-plane deformation and the in-plane deformation of the core material 2 are restrained, the buckling of the core material 2 can be prevented, and the core material 2 can be efficiently plastically deformed. Opening is suppressed.
Since the stiffening member 7 can prevent the entire buckling and the local collapse of the buckling restraining member 3, the fatigue life of the core member 2 can be extended and the energy absorption performance can be improved.

  Further, in the present embodiment, since the insulating material 4 is interposed between the plasticizing portion 21 of the core material 2 and the constraining plate 5, the frictional force acting between the core material 2 and the constraining plate 5 is reduced. can do. Therefore, in the brace damper 1 of the present embodiment, excellent vibration damping performance is exhibited, and the vibration resistance of the building can be effectively improved.

Furthermore, in the present embodiment, since the vertical ribs 74 and the horizontal ribs 75 are provided inside the stiffening member 7, the opening end side of the channel steel faces upward and the ribs inside the stiffening member 7 are made upward during production. Since 74 and 75 can be welded, the welding work is easy and the cost for the work can be reduced. Moreover, since the vertical ribs 74 and the horizontal ribs 75 are in contact with the side surfaces of the restraint plate 5 in a non-fixed state, welding of the restraint plate 5 and the ribs 74, 75 is unnecessary, and the cost for welding work is reduced. Can be suppressed.
In addition, since the end portion of the core material is not reinforced with ribs as in the conventional case, it is possible to increase the length of the plasticized portion 21 of the core material 2 in the direction of the axis O1 and the fatigue life of the core material 2. Can be extended and the energy absorption performance can be improved.

Further, in the present embodiment, when the fixed end portion 5a of the constraining plate 5 is brought into contact with the shear key 8 installed at the fixed-side joint portion 23A of the core material 2, when a compressive load acts on the core material 2, The shear key 8 capable of preventing the buckling restraint member 3 from being displaced in the direction of the axis O1 with respect to the compressive load of the member 2 can be installed at the fixed side joint portion 23A of the core member 2. Thereby, the buckling restraint effect of the core material 2 can be kept constant. Moreover, since the shear key 8 can be attached from the outside of the brace damper 1 by a simple operation, an increase in cost due to installation can be suppressed.
In addition, if it is possible in terms of strength, a fixed side joining bolt may be used instead of the shear key 8.

  Further, in the present embodiment, since the core material 2, the constraining plate 5 and the insulating material 4 are joined by the joining bolts 50 at both ends of the constraining plate 5, it is possible to prevent the constraining plate 5 from opening in the out-of-plane direction. You can

  Further, in the present embodiment, as shown in FIG. 5, a concave portion 6a that opens to the movable side is formed at the movable side end of the cover plate 6, and the concave portion 6a of the cover plate 6 is processed into a U shape. It is possible to increase the welding length of the cover plate 6 and the restraint plate 5 at the movable end. Therefore, the end stiffening force can be increased, and the restraining effect can be maintained without breaking the stiffening member 7.

  Further, in the present embodiment, the movable-side joint portion 23B of the core member 2 has the widened portion 22 having a width dimension larger than that of the plasticized portion 21, and the concave portion 6a is formed at the movable-side end portion of the cover plate 6. By forming the, the interference between the widened portion 22 of the core material 2 and the cover plate 6 can be avoided when the plasticized portion 21 of the core material 2 is deformed and the entire brace is expanded and contracted.

  Further, the core material 2 is configured to integrally include not only the plasticizing portion 21 but also the joint portions 23 (widened portions 22) on both end sides, and the buckling restraint material 3 includes the restraint plate 5 and the cover plate 6 made of steel plates. It is composed of a stiffening member 7 made of channel steel and an insulating member 4 such as a rubber plate, and is integrally formed by on-site welding or bolt joining. As a result, it is possible to realize a low-cost buckling restraint damper that is thin and lightweight as a whole, and is easy to manufacture, even though it is a high yield strength damper.

  Further, by appropriately designing the size and strength of each member of the buckling restraint member 3 as in the present embodiment, the out-of-plane stiffening force and the in-plane stiffening force generated by the buckling of the core member 2 can be reliably performed. It is possible to cope with the buckling of the brace damper 1 as a whole and to realize a high yield strength damper.

  As described above, according to the buckling restraint brace damper of the present embodiment, a sufficient stiffening effect can be obtained without enlarging the cross section of the brace damper 1, and the manufacture can be facilitated and the cost can be reduced.

(Example)
Next, an example carried out in order to prove the effect of the buckling restraint brace damper according to the above-described embodiment will be described below.
FIG. 9 and FIG. 10 show an example in which vertical braces and lateral ribs of channel steel (stiffening material), U-shaped recesses of a cover plate, and shear keys are provided in the brace damper of the above-described embodiment (test. It is a test result showing the effect of the body-B) and the comparative example (test body-A) not provided with the vertical ribs and the horizontal ribs, the recesses, and the shear key. 9 and 10 show the relationship of the load displacement, where the horizontal axis represents the displacement (mm) and the vertical axis represents the load P (kN).
The core material of each of the test bodies A and B has a rectangular cross-sectional shape, and is obtained by stacking three SM400B steel plates.

  In the test body-A according to the comparative example, the load cycle was 17, and the cumulative plastic deformation ratio η showing the energy absorption performance was 295. On the other hand, in the test body-B according to the example, the load cycle was 46 and the cumulative plastic deformation ratio η was 1235. Therefore, it is confirmed that the brace damper according to the example in which the vertical ribs and the horizontal ribs, the recesses, and the shear keys are provided has a higher buckling restraint effect and an improved energy absorption performance as compared with the comparative example that does not have these configurations. We were able to.

  Although the embodiment of the buckling restrained brace damper according to the present invention has been described above, the present invention is not limited to the above-described embodiment and can be appropriately modified without departing from the gist thereof.

  For example, in the present embodiment, the movable plate-shaped end portion of the cover plate 6 is formed with a substantially U-shaped concave portion 6a that opens to the movable side. However, the concave portion 6a may be omitted. I don't care. Further, the shape of the recess 6a is not limited to the substantially U shape as in the present embodiment.

  Further, in the present embodiment, on the movable side of the brace damper 1, the second joint hole 26 of the core material 2 is a circular hole, and the movable side of the restraint plate 5 is a joint long hole 52 of a long hole. There is no limitation. That is, even if the second joint hole 26 of the core material 2 is a long hole and the joint hole on the movable side of the restraint plate 5 is a circular hole, the same effect as that of the above-described embodiment can be obtained.

  The core material 2 does not necessarily have to be formed by integrally laminating three steel plates (center core material 2A, outer core materials 2B, 2B), and may be formed of one steel plate. Alternatively, a plurality of steel plates may be integrally laminated and formed. Further, the number of steel plates of the widened portion 22 may be larger than that of the plasticized portion 21 to ensure high joining strength. Further, although the joint portion 23 of the core material 2 is joined to the gusset plate or the like by using a high-strength bolt, the joint portion 23 may be joined to the frame of the building by welding.

Further, the positions and the numbers of the vertical ribs 74 and the horizontal ribs 75 welded to the inside of the stiffening member 7 can be set appropriately.
Further, in the present embodiment, the lateral rib 75 is provided only on the movable end side of the stiffening member 7, but it is not limited to this position. The lateral ribs 75 may be provided over the entire stiffener 7 in the direction of the axis O1.

  In addition, it is possible to appropriately replace the components in the above-described embodiments with known components without departing from the spirit of the present invention.

1 brace damper (buckling restraint brace damper)
2 core material 2A center core material 2B outer core material 3 buckling restraint material 4 insulating material 5 restraint plate 6 cover plate 7 stiffening material 7a opening end 8 shear key 21 plasticizing portion 22, 22A, 22B widening portion 23 joint portion 24 flange Part 25 Joining hole 26 Joining hole 50 Joining bolt 51 Joining circular hole 52 Joining long hole 71 Web 72 Flange 73 Hand hole 74 Vertical rib 75 Horizontal rib O1 Axis S1 Partial or complete penetration welding S2, S3, S4 fillet welding

Claims (4)

A core member, a buckling restraint member for preventing buckling of the core member, and an insulating member arranged between the core member and the buckling restraint member,
The core material is provided along the axial direction, is provided with plasticizing portions that plastically deform when vibration energy is applied and absorbs this vibration energy, and are provided at both end sides in the axial direction, respectively. A pair of joints for connecting to
The buckling restraint is
A pair of constraining plates that are stacked so as to sandwich the core material and the insulating material, and constrain out-of-plane deformation of the plasticized portion of the core material,
A pair of cover plates that are connected to the pair of constraining plates and are installed so as to surround the core together with the pair of constraining plates, and that constrain in-plane deformation of the plasticized portion of the core. ,
A pair of stiffening members connected to the pair of constraining plates, arranged so as to sandwich the pair of constraining plates, the core member, and the insulating member, and a pair of stiffening members made of channel steel that enhances overall bending rigidity,
Equipped with
One end in the axial direction of the buckling restraint member is a fixed end portion, and the buckling restraint member is fixed to one fixed side joint portion of the pair of joint portions of the core member, and the other end portion in the axial direction is a movable end. And is provided on the other movable side joint portion so as to be movable along the axial direction,
Inside the groove opening side of the stiffening material, vertical ribs and horizontal ribs are provided,
The horizontal ribs are provided at least on the movable end side of the stiffening material, and the respective rib ends of the vertical ribs and the horizontal ribs abut on the side surface of the restraint plate in an unfixed state ,
A buckling restraint brace damper characterized in that a recess opening to the movable end side is formed at an end of the cover plate on the movable end side .   A shear key, which is adjacent to the fixed end portion of the buckling restraint member and regulates the movement of the buckling restraint member to the fixed joint portion side, is fixed to the fixed joint portion of the core member. The buckling restrained brace damper according to claim 1.   The buckling restraint brace according to claim 1 or 2, wherein joining bolts for penetrating and fastening the core material, the restraint plate, and the insulating material are provided at both ends of the restraint plate. Damper. Movable joints located at the movable end side of the core material, any one of claims 1 to 3, characterized in that it has a widened portion having an increased width that is greater than the plastic unit The buckling restrained brace damper described in the item .

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