JP4263664B2 - Damping braces and structures - Google Patents

Description

  The present invention relates to a vibration-damping brace that absorbs vibration energy acting on a structure due to an earthquake, a wind, or the like by itself deforming, and a structure including the same.

Conventional vibration-damping braces generally include a steel axial force member, a restraining member that prevents buckling of the axial force member, and an anti-adhesion coating that prevents adhesion between the restraining member and the axial force member. Is provided. The axial force member includes a plasticized portion that is plastically deformed when a tensile force or a compressive force of a predetermined magnitude or greater is applied, and the axial force member that is surrounded by the restraint member together with the plasticized portion and protrudes from the restraint member. It has a stiffening part that supplements the rigidity of the end part, and a joint part joined to the structure.
The vibration-damping brace is installed diagonally on the structure of a rectangular structure composed of columns and beams, and the end of the axial force member is bolted to the gusset plate welded to the joint between the columns and beams. Fixed.
When vibration energy acts on the structure where the vibration-damping brace is installed due to an earthquake, wind, etc., tensile force or compressive force acts on the axial force member, and the plasticized part is deformed in the tensile or compressive direction and vibrates. Absorb energy.

  With respect to the vibration damping brace as described above, for example, as disclosed in Patent Document 1 below, by defining the film thickness and the film rigidity to prevent adhesion between the hardened concrete and the axial force member Studies have been made to prevent local buckling of the axial force member.

  By the way, various studies and tests have been conducted on the vibration-damping brace as described above in order to verify whether or not the vibration energy is deformed as intended. However, the verification about the buckling deformation of the junction part of a damping brace and a structure is not made | formed. The inventors of the present invention elucidate the problem of the hinge phenomenon that occurs at the end of the axial force member when the damping force is applied to the damping brace in order for the damping brace to produce the desired damping effect. I learned that this is important. Once the end of the axial force member exhibits a hinge phenomenon and exhibits an unstable behavior, the damping brace cannot exhibit the rigidity and proof strength intended in the design and cannot sufficiently absorb vibration energy.

Here, the hinge phenomenon will be described with reference to FIGS.
As shown in FIG. 17A, the vibration suppression brace 100 includes an axial force member 101 and a restraining member 102. The axial force member 101 has a plasticizing portion 103 and a stiffening portion 104.
When an excessive compressive force is applied to the damping brace 100, the end of the axial force member 101 protruding from the restraining member 102, that is, the portion whose rigidity is compensated by the stiffening portion 104 is out of the plane of the axial force member 101. There is a possibility of deformation in the direction, that is, the normal direction of the surface. More specifically, as shown in FIGS. 17B and 17C, the end portion of the axial force member 101 compresses the adhesion preventing coating (not shown) while the plasticizing portion 103 and the stiffening portion 104. Deforms as if the hinge rotates around the boundary of This phenomenon is called a hinge phenomenon, and the state where the end portion of the axial force member 101 is plastically deformed and bent is expressed as “the hinge H is formed”.
JP 2001-227192 A

  The hinge phenomenon in the vicinity of the boundary between the plasticized portion 103 and the stiffening portion 104 cannot actually occur as long as sufficient rigidity is secured at the joint portion between the end portion of the axial force member 101 and the gusset plate 110. However, when a compressive force exceeding the rigidity given to this portion is applied, a similar hinge phenomenon can occur around the boundary between the end of the axial force member 101 and the gusset plate 110. Thus, in a situation where a hinge phenomenon may occur near the boundary between the plasticizing portion 103 and the stiffening portion 104 and near the boundary between the end portion of the axial force member 101 and the gusset plate 110, there are three vibration damping braces 100. Alternatively, four hinges H are formed, and the behavior of the damping brace 100 becomes unstable.

  The present invention has been made in view of the above circumstances, the hinge phenomenon does not occur at the end of the axial force member, and the end of the axial force member does not exhibit unstable behavior, It is an object of the present invention to provide a damping brace and a structure in which an axial force member can sufficiently absorb vibration energy by exhibiting the rigidity and proof strength intended by the design.

As means for solving the above-mentioned problems, a vibration-damping brace and a structure having the following configuration are employed.
That is, the vibration-damping brace of the present invention includes an axial force member that exhibits a proof strength against a tensile force or a compressive force acting in the axial direction, and a restraining member that is provided around the axial force member and restrains the axial force member. A stiffening portion provided at an end portion of the axial force member to supplement the rigidity of the axial force member, and an adhesion preventing body provided between the restraining member and the stiffening portion to prevent adhesion of both. In the vibration suppression brace comprising
The axial length of the stiffening portion so that the end of the axial force member does not rotate more than a certain angle with respect to the axial direction when the compressive force is applied to the axial force member; The size of the gap between the stiffening portion and the restraining member is set, and the gap between the axial force member and the restraining member is larger than the gap between the stiffening portion and the restraining member. To do.

  The stiffening part is necessary to supplement the rigidity of the end of the axial force member, but when the hinge phenomenon as described above occurs in the axial force member, the end of the axial force member exhibits an unstable behavior, The damping brace cannot exhibit the rigidity and proof strength intended by the design, and the vibration energy cannot be absorbed sufficiently. In order to prevent the hinge phenomenon as described above, there is no need to provide a gap between the restraining member and the stiffening portion, but if there is no gap between the two, the axial force member will not perform its intended function. A gap is required between the restraining member and the stiffening portion. Therefore, in the present invention, when the axial length of the stiffening portion and the size of the gap between the stiffening portion and the restraining member are appropriately set and a compressive force is applied to the axial force member, the axial force member By preventing the end from rotating more than a certain angle with respect to the axial direction, the end of the axial force member does not cause a hinge phenomenon, and the end of the axial force member does not exhibit unstable behavior. .

In the vibration suppression brace of the present invention, it is preferable that the certain angle is defined as 1/75 rad (radian), and the axial length of the stiffening portion is set to 150 mm (millimeters) or more.
If the rotation angle allowed at the end of the axial force member is 1/75 rad or less, the end of the axial force member will not be hinged, and the end of the axial force member will not show unstable behavior. . Further, if the axial length of the stiffening portion is shorter than 150 mm, the end portion breakage occurs in the axial force member.

In the vibration damping brace of the present invention, it is preferable that the size of the gap between the restraining member and the stiffening portion is set to 1 mm (millimeters) or less.
Even if the size of the gap between the restraining member and the stiffening portion is larger than 1 mm, the hinge phenomenon does not occur if the rotation angle allowed at the end of the axial force member is 1/75 rad or less. If the gap between the member and the stiffening portion becomes too large, the restraining member will not perform its intended function.
In the damping brace of the present invention, it is desirable that a pin joint to be joined to the structure is provided at an end of the axial force member.

The structure of the present invention is characterized in that the vibration-damping brace of the present invention is installed on a framework of a ramen structure composed of columns and beams.
In the structure of the present invention, it is desirable that the vibration-damping brace is pin-joined to the frame.
When the structure and the damping brace are rigidly joined using, for example, a splice plate, the axial force with which the splice plate is fixed when the rigid frame structure consisting of columns and beams undergoes interlayer deformation. A bending moment is generated at the end of the member, causing rotational deformation at the end of the axial force member. The intended function of the axial force member is to exert a proof strength against the tensile or compressive force acting in the axial direction. Therefore, a pin joint is provided at the end of the axial force member, and the pin is joined to the structure. Thus, even when the structure undergoes interlayer deformation, no bending moment is generated at the end of the axial force member.

  According to the present invention, when the axial length of the stiffening portion and the size of the gap between the stiffening portion and the restraining member are appropriately set and a compressive force is applied to the axial force member, the axial force member By preventing the end portion from rotating more than a certain angle with respect to the axial direction, the end portion of the axial force member does not cause a hinge phenomenon, and the end portion of the axial force member does not exhibit unstable behavior. Therefore, the axial force member can exhibit the rigidity and proof strength intended by the design, and can sufficiently absorb vibration energy.

[First Embodiment]
A first embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1A to 1C, the damping brace 1 includes an axial force member 2 that exerts a proof force against a tensile force or a compressive force acting in the axial direction, and around the axial force member 2. And a restraining member 3 that restrains the axial force member 2. Between the axial force member 2 and the restraining member 3, an adhesion preventing film (an adhesion preventing body) 4 for preventing the adhesion of both is provided.

  The axial force member 2 is covered with the restraining member 3 and protrudes from the restraining member 3 with a plasticizing portion 21 that plastically deforms and absorbs energy when a tensile force or compressive force of a predetermined magnitude or larger is applied. A stiffening portion 22 for supplementing the rigidity of the plasticizing portion 21 and a joint portion 23 provided outside the stiffening portion 22 and joined to the structure are provided. The axial force member 2 is formed of a single steel plate having a uniform thickness, and the plasticizing portion 21 is provided at the center of the axial force member 2. A first widened portion 24 wider than the plasticized portion 21 is provided on both outer sides of the plasticized portion 21, and a second widened portion 25 wider than the first widened portion 24 on the outer side. Is provided.

  Stiffening ribs 5 are provided at both ends of the axial force member 2 along the first and second widened portions 24 and 25. The stiffening rib 5 is formed of a steel plate having a uniform thickness similar to the axial force member 2, and is disposed on both side surfaces of the axial force member 2 along the stiffening portion 22 and the joint portion 23. The portion abutted against the member 2 is welded along the axial direction. The stiffening rib 5 is provided with a third widening portion 51 that constitutes the stiffening portion 22 described above together with the first widening portion 24 at a portion along the first widening portion 24, and the second widening portion 25. A fourth widened portion 52 that is wider than the third widened portion 51 and that forms the joint portion 23 together with the second widened portion 25 is provided in the portion along the line.

  The restraining member 3 includes a reinforcing steel pipe 31 disposed around the axial force member 2 and a concrete 32 that is placed between the steel pipe 31 and the axial force member 2 and hardened. The adhesion preventing film 4 is applied on the surface of the axial force member 2 prior to the placement of the concrete 32, and adhesion between the concrete 32 after being hardened and the axial force member 2 is prevented.

  The adhesion preventing film 4 is composed of a viscoelastic plastic material or paint applied to the surface of the axial force member 2. The adhesion preventing film 4 not only prevents adhesion between the axial force member 2 and the restraining member 3 but also causes the cross-sectional expansion of the axial force member 2 that occurs when a compressive force acts on the axial force member 2. Allow deformation. By providing the adhesion preventing film 4, the axial force member 2 and the concrete 32 covered by the restraining member 3 are separated from each other by the film thickness of the adhesion preventing film 4. As described above, the adhesion preventing film 4 is applied to the surface of the axial force member 2 prior to the placement of the concrete 32, so that the surface of the axial force member 2 covered with the restraining member 3 and the concrete 32 The gap depends on the thickness of the anti-adhesion coating 4 that is applied in advance. Therefore, in the vibration damping brace 1 of the present embodiment, the gap between the side edge 5a of the stiffening rib 5 and the concrete 32 is strictly managed by increasing the construction accuracy of the adhesion preventing film 4 or the like.

  FIG. 2 shows a structure in which the damping brace 1 configured as described above is installed. In this structure, a ramen structure composed of steel columns 6 and beams 7 is employed, and two damping braces 1 are installed between the layers of each floor of the structure. The joint at the upper end of one damping brace 1 is bolted to a gusset plate 8a welded to the center of the beam 7 on the upper floor, and the joint at the lower end is connected to one column 6 and the beam 7 on the lower floor. It is bolted to a gusset plate 8b welded to the joint portion. The joint portion at the upper end of the other damping brace 1 is bolted to the gusset plate 8a described above, and the joint portion at the lower end is welded to the joint portion between the other column 6 and the beam 7 on the lower floor. It is bolted. Any of the vibration-damping braces 1 is arranged such that the composition surface of the axial force member 2 is parallel to the composition surface constituted by the columns 6 and the beams 7, that is, the composition surfaces are matched.

  FIG. 3 shows details of a portion (a portion indicated by symbol E in FIG. 2) in which the joint portion 23 below the vibration brace 1 is bolted to the gusset plate 8b. The gusset plate 8b is welded with the outer rib 9 extending until it reaches the column 6. The axial force member 2 and the gusset plate 8b are clamped with two bolts 10a between two sides of the stiffening rib 5 using two sets of two splice plates 10. Similarly, the stiffening rib 5 and the out-of-plane rib 9 are sandwiched between two locations on both sides of the axial force member 2 by using two sets of two splice plates 10 and using bolts (not shown). It is tightened.

  When vibration energy acts on the structure configured as described above due to an earthquake, wind, or the like, a tensile force or a compressive force acts on the damping brace 1 in the axial direction. The damping brace 1 absorbs vibration energy by receiving these forces and plastically deforming the axial force member 2.

  When a tensile force acts on the vibration-damping brace 1, as shown in FIG. 4A, the axial force member 2 is deformed in the direction extending in the composition surface, but the deformation in the outward direction of the composition surface is caused. Does not occur. When a compressive force acts on the vibration-damping brace 1, as shown in FIG. 4B, the plasticizing portion 21 of the axial force member 2 is displaced outwardly while compressing the adhesion preventing coating 4, Subsequently, the end portion of the axial force member 2 undergoes rotational deformation in the outward direction of the composition surface. More specifically, the end portion of the axial force member 2 compresses the adhesion preventing coating 4 while the boundary portion between the plasticizing portion 21 and the stiffening portion 22 (the tip 5b of the stiffening rib 5 facing the plasticizing portion 21 is formed). It will be deformed as if the hinge is rotating around the part). The behavior of the end portion of the axial force member 2 in a state where the compressive force is applied to the vibration control brace 1 depends on the bending rigidity of the axial force member 2 until the stiffening rib 5 comes into contact with the concrete 32. After the rib 5 comes into contact with the concrete 32, if the shear force of the concrete 32 is sufficiently small, it depends on the proof stress and rigidity of the steel pipe 31. When the magnitude of the compressive force exceeds the limit of elastic deformation of the axial force member 2, the end portion of the axial force member 2 is plastically deformed as if the hinge is rotated and bent (the above-described hinge phenomenon).

  The magnitude θ of the rotation angle generated at the end of the axial force member 2 by the action of the compressive force is the axial length L of the stiffening portion 22 covered by the restraining member 3 and the side of the stiffening rib 5. It is determined depending on the size t of the gap between the edge 5a and the concrete 32. That is, the magnitude of the rotation angle θ generated at the end of the axial force member 2 is expressed by 2t / L rad (radian), and the axial length L of the stiffening portion 22 covered by the restraining member 3 is long. The smaller it is, the shorter it becomes. In addition, the magnitude of the rotation angle θ generated at the end of the axial force member 2 decreases as the gap between the side edge 5a of the stiffening rib 5 and the concrete 32 decreases, and increases as the gap increases.

  The vibration-damping brace 1 of the present embodiment is based on the experimental results described later, and stiffening covered with the restraining member 3 so that a hinge is not formed at the end of the axial force member 2 even if an excessive compressive force is applied. The length L in the axial direction of the portion 22 is defined as 150 mm (millimeter) or more, and the size t of the gap between the side edge 5a of the stiffening rib 5 and the concrete 32 is defined as 1 mm (millimeter) or less. Since the damping brace 1 is defined as described above, the magnitude of the rotation angle θ generated at the end of the axial force member 2 is limited to 1/75 rad (radian) or less, and the end of the axial force member 2 is limited. No hinge is formed on the part.

Hereinafter, regarding the damping brace 1 of the present embodiment, the axial length L of the stiffening portion 22 covered with the restraining member 3 and the size t of the gap between the side edge 5a of the stiffening rib 5 and the concrete 32 are described. Therefore, an experiment conducted by the present inventor on the vibration damping brace 1 of the present embodiment will be described.
The inventor causes the damping brace 1 to be deformed by applying a compressive force and a tensile force to the damping brace 1, and the axial deformation amount δ of the axial force member 2 and the end of the axial force member 2 are The relationship with the magnitude of the generated rotation angle θ was examined. Here, the axial deformation amount δ of the axial force member 2 and the rotation angle θ generated at the end of the axial force member 2 were defined as follows. That is, as shown in FIG. 5 (A), a compression force is applied to the damping brace 1 from a state where the damping brace 1 maintains a linear shape, and as shown in FIG. When the vibration brace 1 is bent by forming the hinge h, the axial deformation amount of the axial force member 2 is δ, and the angle formed by the stiffening portion 22 and the joint portion 23 with respect to the plasticized portion 21. Was defined as θ. In the state of FIG. 5A, the hinge h is not formed on the vibration suppression brace 1 in practice, but the vibration suppression brace 1 of FIG. 5A has a hinge for the purpose of comparison with FIG. h is described.

  FIG. 6 shows a loading device 200 used in the experiment. The loading device 200 is supported on the base 201 so that one end of the axial force member 2 is joined and stayed in a fixed position, and the other end of the axial force member 2 is joined and movable in the axial direction. And an applied force jig 203. A jack (not shown) for selectively applying a compressive force and a tensile force to the damping brace 1 is connected to the force applying jig 203 via the force applying jig 203.

When compressive force and tensile force were applied to the damping brace 1 with the target of 4% axial strain of the axial force member 2, experimental results as shown in FIG. 7A were obtained. When compressive force is applied to the damping brace 1, even if the amount of negative deformation in the axial direction increases to some extent, the magnitude of the rotation angle θ generated at the end of the axial force member 2 does not increase beyond a certain level. ing. When a tensile force is applied to the damping brace 1, assuming that a positive amount of axial deformation is caused by the initial strain of the axial force member 2, the rotation angle θ generated at the end of the axial force member 2 is large. The height is suppressed to about 1/75 rad. This is because the rotation of the end portion of the axial force member 2 is allowed only by the gap between the side edge 5a of the stiffening rib 5 and the concrete 32, but the further rotation is caused by the resistance of the concrete 32 and the steel pipe 31. Because it was suppressed.
When compressive force and tensile force are applied to the damping brace 1 with the target of 2% axial strain of the axial force member 2, the axial deformation amount δ of the axial force member 2 is small as shown in FIG. However, the same tendency as above was observed.

  In the experiment described above, the end of the axial force member 2 was not bent, and no hinge was formed on the axial force member 2. The loading conditions in the experiment correspond to the case where the entire surface of the axial force member follows the interlayer deformation of the structure, and the eccentric compressive force acts on the end of the axial force member 2. Absent. Further, the fact that the length L in the axial direction of the stiffening portion 22 covered with the restraining member 3 is sufficient is considered to be a factor that the hinge is not formed.

  In the present embodiment, the construction surface of the axial force member 2 is arranged in parallel to the construction surface constituted by the columns 6 and the beams 7. The same effect as described above can be obtained even if it is arranged perpendicularly to the construction surface constituted by. As shown in FIG. 8, the stiffening rib 5 and the gusset plate 8b are sandwiched between two portions on both sides of the axial force member 2 using two sets of two splice plates 10 and using bolts 10a. It is fastened. Similarly, the axial force member 2 and the out-of-plane rib 9 are sandwiched between two locations on both sides of the stiffening rib 5 using two sets of two splice plates 10 and bolts (not shown) are used. It is tightened.

[Second Embodiment]
A second embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the component already demonstrated in the said 1st Embodiment, and description is abbreviate | omitted.
As shown in FIGS. 9A and 9B, the vibration damping brace 1 of the present embodiment is provided with a stiffening rib 53 having the same length as the axial force member 2. The stiffening rib 53 is formed of a steel plate having the same thickness as the axial force member 2, and the two stiffening ribs 5 provided at both ends of the axial force member 2 are arranged along the plasticized portion 21. The connection bar 54 is arranged through a connection bar 54 arranged in the form of a connector. The stiffening ribs 53 are disposed on both side surfaces of the axial force member 2 and welded along the axial direction at portions abutted against the axial force member 2. The connecting bar 54 supplements the rigidity of the plasticizing portion 21 of the axial force member 2.

  In the vibration damping brace 1 of the present embodiment, the axial length L of the stiffening portion 22 covered by the restraining member 3 is defined to be 150 mm or more, and the stiffening rib 5 is similar to the first embodiment. The size t of the gap between the side edge 5a and the concrete 32 is defined to be 1 mm or less. The vibration damping brace 1 of the present embodiment is also regulated as described above, so that the magnitude θ of the rotation angle generated at the end of the axial force member 2 is limited to 1/75 rad or less. No hinge is formed at the end.

Hereinafter, regarding the damping brace 1 of the present embodiment, the axial length L of the stiffening portion 22 covered with the restraining member 3 and the size t of the gap between the side edge 5a of the stiffening rib 5 and the concrete 32 are described. Therefore, an experiment conducted by the present inventor on the vibration damping brace 1 of the present embodiment will be described.
The inventor arranges the damping brace 1 on a structure composed of a steel column 6 and a beam 7 and arranges the surface of the axial force member 2 in parallel with the surface formed by the column 6 and the beam 7. And attached. Then, by causing interlayer deformation in the structure, compressive force and tensile force are applied to the damping brace 1 with the target of 2% axial strain of the axial force member 2, and the axial force member 2 is deformed in the axial direction. The relationship between the amount δ and the magnitude of the rotation angle θ generated at the end of the axial force member 2 was examined. Also in this case, as shown in FIG. 10, the tendency similar to the experiment performed for the first embodiment was observed although the axial deformation amount δ of the axial force member 2 was small.

[Third Embodiment]
A third embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the component already demonstrated in said each embodiment, and description is abbreviate | omitted.
As shown in FIGS. 11A and 11B, the vibration damping brace 1 of the present embodiment is provided with two axial force members 2. These two axial force members 2 are arranged in parallel at equal intervals, and one stiffening rib 5 is provided for each axial force member 2. When this damping brace 1 is installed in a structure, a gusset plate 8a (or 8b, 8c) is inserted between the ends of the two axial force members 2, and is bolted without using a splice plate. The The stiffening rib 5 may be bolted using a splice plate.

[Fourth Embodiment]
A fourth embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the component already demonstrated in said each embodiment, and description is abbreviate | omitted.
As shown in FIGS. 12A and 12B, the damping brace 1 of the present embodiment is also provided with two axial force members 2, and each axial force member 2 has one restraining member 3. Is provided.

[Fifth Embodiment]
A fifth embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the component already demonstrated in said each embodiment, and description is abbreviate | omitted.
13A to 13D show modifications of the restraining member 3 shown in each of the above embodiments. A restraining member 3a shown in FIG. 13 (A) is used as an alternative to the restraining member 3 of the first and second embodiments. This restraining member 3 a is a combination of two channel steels 33 and two flat steels 34. Each channel steel 33 is arrange | positioned so that the plasticizing part 21 of the axial force member 2 may be pinched | interposed by the mutual web back surface. Each flat steel 34 is arranged along the flange surface of the adjacent channel steel 33 across the plasticized portion 21. The channel steel 33 and the flat steel 34 are fastened with bolts 35, respectively.

  A restraining member 3b shown in FIG. 13B is used as an alternative to the restraining member 3 of the third embodiment. This restraining member 3 b is a combination of four angle steels 36. Each angle steel 36 is arranged so that a back surface protruding at a right angle follows a right-angled groove surface formed between the plasticizing portion 21 and the connecting bar 54. Adjacent ones of the angle steels 36 are fastened using bolts 35 with the plasticized portion 21 or the connecting bar 54 sandwiched between the flange surfaces.

  A restraining member 3c shown in FIG. 13C is used as an alternative to the restraining member 3 of the first and second embodiments. The restraining member 3c is a combination of two box steels 37 and two flat steels 34 having a rectangular cross section. Each box-shaped steel 37 is arrange | positioned so that the plasticizing part 21 of the axial force member 2 may be pinched | interposed by the mutual side surface. Each flat steel 34 is arranged along the side surface of the box-shaped steel 37 adjacent on both sides of the plasticized portion 21. The box steel 37 and the flat steel 34 are fixed by welding.

  A restraining member 3d shown in FIG. 13D is used as an alternative to the restraining member 3 of the third embodiment. This restraining member 3d is a combination of four box-shaped steels 38 and four flat steels 34 having a rectangular cross section. Each box-shaped steel 38 is arranged so that two adjacent side surfaces are along a right-angled groove surface formed between the plasticizing portion 21 and the connecting bar 54. Each flat steel 34 is arranged along the side surface of the box-shaped steel 38 adjacent to the plasticized portion 21. The box steel 38 and the flat steel 34 are fixed by welding.

[Sixth Embodiment]
A sixth embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the component already demonstrated in said each embodiment, and description is abbreviate | omitted.
As shown in FIGS. 14A and 14B, the vibration damping brace 1 of the present embodiment is provided with a pin joint block (pin joint) 60 that is pin-joined to a structure as the joint portion 23. . Two pin support portions 61 are provided in the pin joint block 60 so as to be separated from each other in parallel, and a pin hole 62 is formed in each shaft support portion 61.
When the vibration brace 1 is installed in the structure, the gusset plate 8a (or 8b, 8c) is inserted between the two shaft support portions 61, and the pin hole 62 and the pin hole 8d formed in the gusset plate 8a. A pin (not shown) is rotatably mounted on.

  When vibration energy acts on the structure where the vibration suppression brace is installed due to an earthquake or wind, and the structure undergoes interlayer deformation, the end of the vibration suppression brace is connected to the column 6 and the beam 7 using the splice plate 10. In the end of the damping brace, a bending moment is generated in the in-plane direction of the column 6 and the beam 7, but the damping brace 1 is structured as described above. Since the end portion of the vibration suppression brace 1 rotates, the bending moment does not occur and only the tensile force or the compression force acts on the vibration suppression brace 1. The characteristics of the brace 1 can be fully exhibited.

[Seventh Embodiment]
A seventh embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the component already demonstrated in said each embodiment, and description is abbreviate | omitted.
As shown in FIG. 15, the damping brace 1 of the present embodiment is inclined so that the side edge 5 a of the stiffening rib 5 forms an angle γ with respect to the axial direction of the axial force member 2. The inner surface of the concrete 32 also inclines in the restraint member 3 according to the inclination of the side edge 5a. Thereby, the clearance gap between the side edge 5a of the stiffening rib 5 and the concrete 32 is equal.

  When a compressive force acts on the damping brace 1 configured as described above, the axial force member 2 is distorted in the axial direction, and the end of the axial force member 2 is pushed into the inside of the restraining member 3. As a result, the size of the gap between the side edge 5a of the stiffening rib 5 and the concrete 32 is smaller than that in the state where the compressive force is not acting, so the rotation angle θ generated at the end of the axial force member 2 is also small. Thus, no hinge is formed at the end of the axial force member 2.

[Eighth Embodiment]
An eighth embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the component already demonstrated in said each embodiment, and description is abbreviate | omitted.
In the vibration damping brace 1 of the present embodiment, as shown in FIG. 16, the size s of the gap between the plasticized portion 21 and the concrete 32 is the size of the gap between the side edge 5a of the stiffening rib 5 and the concrete 32. It is set larger than t.

  When a compressive force is applied to the damping brace 1 configured as described above, the stiffening rib 5 comes into contact with the concrete 32 and the behavior of the end portion of the axial force member 2 is limited. Even in this state, since the plasticized portion 21 does not contact the concrete 32, deformation in the axial direction of the axial force member 2 caused by the application of compressive force is smoothly performed without receiving excessive resistance, and is controlled. The vibration brace 1 does not exhibit unstable behavior.

In the present embodiment, the plasticizing portion 21 of the axial force member 2 has a rectangular cross-sectional shape. However, in the present invention, the cross-sectional shape of the axial force member is not limited to a rectangular shape, for example, a circular shape, a hollow rectangular shape, Any shape, such as a hollow circle, can be employed.
In this embodiment, although the restraint member 3 was comprised combining the steel pipe 31 and the concrete 32, it may replace with concrete and may use mortar.
In the present embodiment, the axial force member 2 is formed of a single steel plate having a uniform thickness. However, the thickness of the axial force member is reduced by, for example, making the plasticized portion thinner than other portions. You can change it. Moreover, you may comprise an axial force member combining several steel plates.
In the present embodiment, the adhesion preventing film 4 is constituted by a viscoelastic plastic material or a paint applied on the surface of the axial force member 2, but the adhesion preventing body of the present invention covers the surface of the axial force member 2. It is not limited to a film-like one, and a plurality of them may be present apart from each other in the gap between the axial force member 2 and the restraining member 3. Furthermore, it is not limited to a solid one, and may be a liquid such as lubricating oil.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to these embodiments. Additions, omissions, substitutions, and other modifications can be made without departing from the spirit of the present invention. The invention is not limited by the foregoing description, but only by the scope of the appended claims.

1A is a longitudinal sectional view showing a first embodiment of the vibration-damping brace of the present invention, FIG. 1B is a transverse sectional view of the embodiment, and FIG. 1C is FIG. It is an arrow sectional view of the AA line in FIG. It is a front view showing typically a 1st embodiment of a structure of the present invention. It is a front view which shows the junction part of a damping brace and a structure. FIG. 4A is a state explanatory diagram showing the behavior of the end portion of the axial force member when a tensile force is applied to the damping brace, and FIG. 4B is a case where a compressive force is applied to the damping brace. It is state explanatory drawing which shows the behavior of the edge part of an axial force member. FIG. 5 (A) is a schematic diagram showing a mode of a vibration suppression brace when no force is applied to the vibration suppression brace, and FIG. 5 (B) is a case where a compression force is applied to the vibration suppression brace. It is a schematic diagram which shows the aspect of a damping brace. It is a front view which shows the structure of the loading apparatus used for the loading test of the damping brace. FIG. 7A shows a case where a compressive force and a tensile force are applied to the damping brace with a target of 4% axial distortion of the axial force member, and the axial deformation amount δ of the axial force member and the end of the axial force member are generated. FIG. 7B is a diagram showing the relationship with the magnitude of the rotation angle θ, and FIG. 7B is a diagram in which a compressive force and a tensile force are applied to the damping brace with the target of 2% axial strain of the axial force member, and It is a figure which shows the relationship between deformation amount (delta) and the magnitude | size of rotation angle (theta) produced in the edge part of an axial force member. It is a modification of this embodiment, Comprising: It is a front view which shows the junction part of the damping brace of this invention, and a structure. FIG. 9A is a cross-sectional view showing a second embodiment of the vibration-damping brace of the present invention, and FIG. 9B is a cross-sectional view taken along the line BB in FIG. 9A. By applying a compressive force and a tensile force to the damping brace with the target of 2% axial strain of the axial force member, the amount of axial deformation of the axial force member δ and the magnitude of the rotation angle θ generated at the end of the axial force member It is a figure which shows a relationship. FIG. 11A is a cross-sectional view showing a third embodiment of the vibration-damping brace of the present invention, and FIG. 11B is a cross-sectional view taken along the line CC in FIG. 11A. 12A is a cross-sectional view showing a fourth embodiment of the vibration-damping brace of the present invention, and FIG. 12B is a cross-sectional view taken along line DD in FIG. 12A. 13 (A), 13 (B), 13 (C), and 13 (D) show a fifth embodiment of the vibration-damping brace of the present invention, in which the restraining member shown in each of the above embodiments is shown. It is sectional drawing which shows a modification. FIG. 14A is a longitudinal and transverse sectional view showing a sixth embodiment of the vibration damping brace of the present invention, and FIG. 14B is a transverse sectional view of the same embodiment. It is a longitudinal cross-sectional view which shows 7th Embodiment of the damping brace of this invention. It is a longitudinal cross-sectional view which shows 8th Embodiment of the damping brace of this invention. FIG. 17A is a schematic diagram illustrating a state in which the behavior of the vibration suppression brace is stable even when a compressive force is applied to the vibration suppression brace. FIGS. 17B and 17C illustrate vibration suppression. FIG. 6 is a schematic diagram showing a state in which the compression force acts on the brace to cause a hinge phenomenon, and the behavior of the damping brace becomes unstable.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Damping brace 2 Axial force member 3 Restraint member 4 Adhesion prevention film (adhesion prevention body)
21 Plasticizing portion 22 Stiffening portion 23 Joint portion L Length of axial direction of stiffening portion 22 t Size of gap between stiffening portion 22 and restraining member 3

Claims (6)

An axial force member demonstrating proof against tensile or compressive force acting in the axial direction;
A restraining member provided around the axial force member and restraining the axial force member;
A stiffening portion provided at an end of the axial force member to supplement the rigidity of the axial force member;
A vibration-damping brace provided with an adhesion preventing body that is provided between the restraining member and the stiffening portion and prevents adhesion of both,
The axial length of the stiffening portion so that the end of the axial force member does not rotate more than a certain angle with respect to the axial direction when the compressive force is applied to the axial force member; The size of the gap between the stiffening portion and the restraining member is set, and the gap between the axial force member and the restraining member is larger than the gap between the stiffening portion and the restraining member. Damping brace.   The damping brace according to claim 1, wherein the certain angle is defined as 1/75 rad (radian), and the axial length of the stiffening portion is set to 150 mm (millimeters) or more.   The vibration-damping brace according to claim 2, wherein a size of a gap between the restraining member and the stiffening portion is set to 1 mm (millimeter) or less.   The damping brace according to any one of claims 1 to 3, wherein a pin joint joined to a structure is provided at an end of the axial force member.   A structure in which a framework of a ramen structure composed of columns and beams is adopted, wherein the damping brace according to any one of claims 1 to 4 is installed in the framework. . The structure according to claim 5, wherein the vibration-damping brace is pin-bonded to the frame.

Images