JP6116346B2 - Damping member and core material - Google Patents

Description

  The present invention relates to a vibration damping member that attenuates an excitation force due to an earthquake or the like, and a core material used therefor.

  Conventionally, in a building or a bridge structure, for example, a buckling restrained brace is known as a vibration damping member used for bracing. This buckling-restrained brace is plastically deformed while preventing out-of-plane deformation and buckling by restraining the core material that receives axial force from the outer peripheral side by a steel pipe, and the earthquake and vibration control performance of buildings and bridge structures. To improve.

  Here, in such a buckling-restrained brace, since a flat steel plate is generally used as a core material, vibration energy is absorbed by the yielding of the entire cross section of the core material when an excitation force is applied. . For this reason, the core material becomes a rigid member with respect to an excitation force that is small enough not to yield a cross section, and cannot sufficiently absorb vibration energy.

  Here, Patent Document 1 discloses a buckling-restrained brace in which a corrugated steel plate is applied as a core material. And by making the core material corrugated in this way, it is possible to improve the deformation performance of the core material when the excitation force is applied, and it is sufficient even for small excitation force due to small earthquakes or winds, etc. Vibration absorption performance can be obtained.

JP 2008-150842 A

  However, in the buckling restrained brace disclosed in Patent Document 1, the amount of gap between the core material and the restraining member is not clearly defined. If there is not a sufficient gap between the core material and the restraining member, when an excitation force is applied, free deformation of the core material in the undulations will be suppressed, and the core material will be sufficient. The vibration energy may not be absorbed.

  The present invention has been made in consideration of such circumstances, and a vibration damping member that reliably absorbs vibration energy regardless of the magnitude of the excitation force to improve the vibration damping effect, and is used for the same. An object of the present invention is to provide a core material.

In order to solve the above problems, the present invention employs the following means.
That is, the vibration damping member according to the present invention extends along the axis, and extends along the axis, in which the core is formed in the shape of a corrugated plate in the direction of the axis alternately and continuously. Then, in a state where both ends of the axis of the core material are projected, a restraining member that covers the core material from the outer peripheral side, and a trough side of the corrugation in the core material are in contact with the core material A wave-shaped holding member that has a convex head and is provided so as to be relatively movable with respect to the inner surface of the restraining member, and the top of the wave mountain in the core material and the inner surface of the restraining member, The core member is non-contact in a state where no external force acts in the direction of the axis.

According to such a vibration damping member, since the core member and the restraining member are not in contact with each other in a state where no external force acts on the core member, a gap is provided between the core member and the restraining member. Will be. Here, when a compressive external force in the direction of the axis acts on the core material, it is possible to allow the core material to be deformed so that the ridges of the core material become higher due to the gap. Therefore, until the core material is sufficiently deformed and absorbs vibration energy, the restraint member does not suppress the deformation of the undulation, and the core material ridge is locally deformed and the core material is contained in the restraint member. Can prevent the core material from moving relative to the restraining member.
Further, the core material is deformed so that the undulation is lowered when a tensile force pulling in the axial direction is applied, and is deformed so that the undulation is increased when a compressive force is applied in the axial direction. When such deformation occurs in the core material, the convex shape of the corrugated holding member comes into contact with the core material, so that the wave mountain shape can be held in a predetermined shape.

  Further, the top of the wavy mountain in the core material and the inner surface of the restraining member contact each other when an external force acts on the core material in the direction of the axis to cause a maximum amount of design deformation. May be.

  As described above, when a force pressing in the axial direction is applied to the core material, and a compression deformation of the maximum design deformation amount occurs, the constraint force by the constraint member can be applied to the core material.

  The vibration damping member according to the present invention may further include an intermediate fixing member that is provided at an intermediate position in the axial direction of the core material and fixes the core material and the restraining member at the intermediate position. Good.

  By providing a gap between the core material and the restraining member, the core material can easily move in the direction of the axis with respect to the restraining member. By fixing the member, movement of the entire core material in the axial direction can be prevented.

  Further, the restraining member may be formed with a small diameter portion so that the inner diameter becomes smaller at both end sides in the direction of the axis.

  In the vibration damping member of the present invention, since there is a gap between the core material and the restraining member, the core material is likely to come off from the restraining member in the axial direction. Omission can be prevented.

  Furthermore, the core material may be a laminated plate in which a plurality of corrugated plates are laminated.

  The core material is manufactured, for example, by bending a plate material by press molding. Here, the yield strength can be improved by making the core material a laminated plate. Then, by laminating each corrugated plate after bending it, it is possible to perform bending more easily than when bending thick plates. Moreover, the freedom degree of the yield strength adjustment of a core material increases by adjusting the thickness of each corrugated sheet, and the number of lamination | stacking suitably.

  A core material according to the present invention is a core material used for the above-described vibration damping member, and is a laminated plate in which a plurality of corrugated plates are laminated.

  According to such a core material, the yield strength can be improved. Then, by laminating each corrugated plate after bending it, it is possible to perform bending more easily than when bending thick plates. Moreover, the freedom degree of yield strength adjustment increases.

According to the vibration damping member of claim 1, since the deformation of the undulation of the core material can be allowed, the entire core material can sufficiently absorb the vibration energy, and the vibration can be reliably performed regardless of the magnitude of the excitation force. It can absorb energy and improve the vibration control effect.
Furthermore, by holding the wavy shape by the wave shape holding member, it is possible to suppress the occurrence of overall buckling of the core material and to suppress a temporary decrease in yield strength during compression deformation.

  Further, according to the vibration damping member of the second aspect, it is possible to suppress the deformation of the core material exceeding the maximum design deformation amount while allowing the core material to be compressed and deformed.

Further, according to the vibration damping member of claim 3 , the intermediate fixing member can prevent the relative displacement of the core material with respect to the restraining member, and the restraining force from the restraining member acts on the core material reliably, so that the vibration is reliably caused. Attenuation function can be exhibited.

According to the vibration damping member of the fourth aspect , the core member can be prevented from coming off by the small diameter portion of the restraining member, and the restraining force from the restraining member can be reliably applied to the core member.

Furthermore, according to the vibration damping member of the fifth aspect, the core material can be easily processed while maintaining the yield strength, which leads to cost reduction due to improvement in manufacturability.

Moreover, according to the core material of Claim 6 , it becomes easy to process, maintaining yield strength, and leads to the cost reduction by improvement of manufacturability.

It is a whole perspective view which shows the member for damping | damping which concerns on 1st embodiment of this invention. It is sectional drawing containing the axis line which shows the member for damping | damping which concerns on 1st embodiment of this invention, Comprising: The core material is seen from the plate width direction. FIG. 3 is a cross-sectional view showing the periphery of a corrugated holding member with respect to the vibration damping member according to the first embodiment of the present invention, and shows the details of part A in FIG. 2. FIG. 3 is a cross-sectional view showing the periphery of an intermediate fixing member with respect to the vibration damping member according to the first embodiment of the present invention, and shows details of a B part in FIG. 2. It is sectional drawing of the member for damping | damping, Comprising: If the waveform holding member is not provided, the state which the deformation | transformation produced in the core material will be shown. FIG. 4 is a top view schematically showing a state of deformation of the core material in relation to the vibration damping member of the first embodiment of the present invention, where (a) shows a state where the core material is not deformed, (b) (C) shows the case where compressive deformation occurs in the core material when tensile deformation occurs in the core material. It is a top view which shows a core material regarding the member for damping | damping of 2nd embodiment of this invention, Comprising: (a) shows the state before lamination | stacking, (b) shows the state after lamination | stacking. It is a top view which shows a core material regarding the damping member of the modification of 2nd embodiment of this invention, Comprising: (a) shows the state before lamination | stacking, (b) shows the state after lamination | stacking. .

[First embodiment]
Hereinafter, the vibration damping member 1 according to the first embodiment of the present invention will be described.
The damping member 1 is a buckling-restrained brace that is used, for example, for bracing in a building or a bridge structure and improves the seismic resistance and damping performance.

  As shown in FIG. 1, the vibration damping member 1 includes a core member 3 extending along the axis P, and a constraint covering the pair of core members 3 from the outer peripheral side in a state where the core member 3 protrudes at both ends in the direction of the axis P. And a member 4.

  As shown in FIG. 2, the core material 3 is formed in a corrugated plate shape by the undulations 5 being alternately continued in the direction of the axis P, and the top of the undulations 5 contacts the inner surface of the restraining member 4. It comes to touch.

  Furthermore, the core material 3 is expanded and contracted in the direction of the axis P by receiving an external force in the direction of the axis P.

  Furthermore, the core material 3 is sandwiched from the plate thickness direction at both ends in the direction of the axis P located outside the restraining member 4, and the damping member 1 is installed in the structure. An end member 7 serving as an attachment portion is provided. The end member 7 has a contact portion 7a having a block shape at a position facing the end portion of the restraining member 4 in the direction of the axis P. The abutting portion 7a is just abutted against the end surface of the restraining member 4 in the direction of the axis P when an external force is applied to the core member 3 and a maximum amount of compressive deformation occurs.

  In addition, the restraining member 4 is made of a square tube-shaped steel material, and the top of the wavy mountain 5 and the inner surface of the restraining member 4 are not in contact with each other in the state where no external force acts on the core member 3 in the direction of the axis P. It is formed to become. And when the external force acts on the core material 3 and the maximum amount of compressive deformation occurs, the top of the wavy mountain 5 and the inner surface of the restraining member 4 come into contact with each other.

Further, the constraining member 4 is formed with a small diameter portion 4a having a smaller inner diameter dimension in a direction in contact with the top of the wavy mountain 5 on both end sides in the axis P direction. Specifically, the small-diameter portion 4a has a distance between the tops of the undulations 5 adjacent to each other in the direction of the axis P (the undulations) so as to prevent the core member 3 from coming off from the restraining member 4 in the direction of the axis P. The inner diameter dimension is smaller than twice the amplitude of 5), and faces the core material 3 with a slight gap from the core material 3.
Here, the small diameter portion 4a may have any shape as long as the inner diameter of the restraining member 4 is reduced. For example, the small diameter portion 4a may be a protrusion protruding from the inner surface of the restraining member 4.

  Here, as shown in FIG. 2 to FIG. 4, the damping member 1 includes a corrugated holding member 10 provided inside the restraining member 4 and a core material at a midway position in the axis P direction of the core material 3. 3 and an intermediate fixing member 15 for fixing the restraining member 4.

  The wave shape holding member 10 is arranged between the wave crest 5 in the core material 3 and the inner surface of the restraining member 4 in contact with the wave crest 5. Specifically, the wave shape holding member 10 is inserted between the core material 3 and the restraining member 4 at a position on the valley side of the wave mountain 5, and the inner side of the restraining member 4 from the plate width direction of the core material 3. Supported by the surface. Thereby, the wave shape holding member 10 is provided so as to be relatively movable with respect to the inner surface of the restraining member 4 and the core material 3.

Here, in the present embodiment, the wave shape holding member 10 has one side in the direction of the axis P (left side as viewed in FIG. 2) and the other side across the center position of the core material 3 in the direction of the axis P. A plurality (three in the present embodiment) are provided on the valley side of the adjacent wave mountain 5 at each position corresponding to the wave mountain 5 formed at the position.
Moreover, in this embodiment, the installation position of the waveform holding member 10 is set to three wave peaks 5 located at the center between the intermediate fixing member 15 described later and one end (the other side) of the core member. It is a corresponding position.

  Each corrugated holding member 10 includes a convex head 11 formed with a curved surface 11 a facing the corrugated mountain 5 along the shape of the corrugated mountain 5, and between the convex head 11 and the inner surface of the restraining member 4. And a base portion 12 in the form of a block formed integrally with the convex head portion 11. In addition, a gap is formed between the wave shape holding member 10 and the top of the wave mountain 5 in a natural state where no external force acts on the core material 3.

  With respect to this gap, when a tensile force pulling in the direction of the axis P acts on the core material 3 and a tensile deformation of a preset maximum design deformation amount is generated in the core material 3, just the wavy mountain 5 and The curved surface 11a of the convex head 11 in the wave shape holding member 10 is set to a dimension that comes into contact with the core material 3 from the plate width direction (see FIG. 6B).

  Further, the gap is formed by a compressive force that pushes the core material 3 in the direction of the axis P, and when the compression deformation of the preset maximum design deformation amount occurs in the core material 3, The dimension is set such that the curved surface 11a comes into contact with the direction of the axis P (see FIG. 6C).

  The intermediate fixing member 15 is provided inside the restraining member 4 between the inner surface of the restraining member 4 and the core material 3, sandwiches the core material 3 from the thickness direction of the core material 3, and uses, for example, a core by a bolt or the like. It is fixed to the material 3 and the restraining member 4, and the core material 3 cannot be moved relative to the restraining member 4.

In the present embodiment, the intermediate fixing member 15 is provided at the central position in the axis P direction of the core member 3, but is not limited to this position, and may be anywhere in the middle of the axis P direction.
Further, the intermediate fixing member 15 may be provided so as to extend over the entire region in the plate width direction of the core material 3, or a plurality of intermediate fixing members 15 may be provided at intervals in the plate width direction.

  In such a vibration damping member 1, the core material 3 and the restraining member 4 are not in contact with each other in a natural state where no external force acts on the core material 3. There is a gap between them.

  Here, when a compressive force is applied to the core material 3 so that the core material 3 is pressed in the direction of the axis P, the core material 3 is deformed so that the wave mountain 5 becomes higher. At this time, in the present embodiment, such a deformation of the core material 3 can be allowed by the gap between the core material 3 and the restraining member 4.

  Accordingly, the wave member 5 is not suppressed from being deformed by the restraining member 4 until the core member 3 is sufficiently deformed to absorb the vibration energy, and the wave mountain 5 of the core member 3 is locally increased as in the case where there is no gap. Is deformed, and the core material 3 is clogged in the restraint member 4, and the core material 3 can be prevented from being unable to move relative to the restraint member 4.

Furthermore, when an external force acts on the core material 3 in the direction of the axis P and the maximum deformation amount of compression deformation occurs, the top of the wavy mountain 5 and the inner surface of the restraining member 4 come into contact with each other. The restraining force by the restraining member 4 acts on the core material 3. Further, when the maximum deformation amount of the compression deformation occurs, the contact portion 7a of the end member 7 contacts the end surface of the restraining member 4 in the direction of the axis P, and further compression deformation of the core material 3 is suppressed. To do.
Therefore, the compression deformation of the core material 3 is allowed until the maximum design deformation amount of the compression deformation occurs, and the deformation of the core material 3 exceeding the maximum design deformation amount can be suppressed while absorbing the vibration energy.

  In addition, since a gap is provided between the core material 3 and the restraining member 4, when the core material 3 shifts from tensile deformation to compression deformation, as shown in FIG. There is a possibility that minute overall buckling occurs in the core material 3 between one side (the other side) in the P direction (deformation of the primary mode in FIG. 5). In this regard, in the present embodiment, the deformation is suppressed by the wave shape holding member 10 so that the core material 3 has a predetermined shape so as to suppress such overall buckling. That is, the height dimension of the wavy mountain 5 and the width dimension in the direction of the axis P of the wavy mountain 5 fall within a predetermined value range according to the shape of the curved surface 11 a of the convex head 11.

  Specifically, when the tensile force acts on the core material 3 as shown in FIG. 6B from the state where no external force acts on the core material 3 as shown in FIG. And the curved surface 11a come into contact with each other from the plate thickness direction, and deformation is suppressed so that the height of the wave mountain 5 does not become lower than this.

  And as shown in FIG.6 (c), if a compressive force acts with respect to the core material 3, the wavy mountain 5 and the curved surface 11a will contact from the direction of the axis P, and the wavy mountain 5 may not become higher than this. Suppresses deformation.

  In this way, the overall buckling of the core material 3 as shown in FIG. 5 can be suppressed, and the core material 3 can be stretched and deformed while the wavy mountain 5 maintains a predetermined shape. It is possible to suppress a temporary decrease in yield strength due to the occurrence. Further, the core material 3 can be uniformly strained with respect to the core material 3.

  In addition, for example, when a manufacturing error has occurred in the core material 3 such as a part of the wave mountain 5 being extremely thin, when the core material 3 expands and contracts, May cause larger deformation than other wave mountains 5. Therefore, by providing the wave shape holding member 10 on the valley side of the wave mountain 5 having such a manufacturing error, it is possible to suppress such partial wave mountain 5 from being locally deformed.

In the present embodiment, since the wave shape holding member 10 is provided at a position corresponding to the wavy mountain 5 at the center position in the direction of the axis P in the core material 3, deformation of the primary mode in the core material 3 can be suppressed. is there. Here, the installation location of the wave shape holding member 10 is not limited to the case of the present embodiment, and may be determined according to the number of wave mountains 5. In addition, the installation position of the waveform holding member 10 can be appropriately selected so as to suppress deformation of the vibration mode higher than the secondary mode.
That is, the wave shape holding member 10 only needs to be provided on the valley side of at least two adjacent wave peaks 5.

  In addition, about the convex head 11 in the waveform holding member 10, the surface which opposes the wave mountain 5 does not necessarily need to be formed in the curved surface 11a. For example, the convex head 11 may have a triangular cross section when viewed from the plate width direction of the core member 3, and the apex of the triangle may come into contact with the position on the valley side corresponding to the top of the wave mountain 5. Various shapes of the base portion 12 can be selected.

  Here, the wave shape holding member 10 does not have to have a shape extending vertically across the entire plate width direction of the core material 3. For example, a plurality of wave shape holding members 10 may be provided at intervals in the plate width direction.

  Furthermore, since the gap is provided between the core material 3 and the restraining member 4, the core material 3 is likely to move relatively in the direction of the axis P with respect to the restraining member 4. By fixing the core material 3 and the restraining member 4 with the fixing member 15, such movement of the core material 3 in the direction of the axis P can be prevented. Accordingly, it is possible to prevent the displacement of the core material 3 in the direction of the axis P with respect to the restraining member 4, and to reliably apply the restraining force from the restraining member 4 to the core material 3, thereby surely exerting the vibration damping function.

  Further, the small diameter portion 4 a formed on the restraining member 4 can also prevent the core material 3 from moving in the direction of the axis P and the core material 3 from the restraining member 4 being pulled out. The restraining force from the member 4 can be made to act reliably.

  According to the vibration damping member 1 of the present embodiment, the deformation of the wave crest 5 of the core material 3 can be allowed, so that the entire core material 3 can sufficiently absorb vibration energy, regardless of the magnitude of the excitation force. Therefore, it is possible to reliably absorb vibration energy and improve the damping effect.

[Second Embodiment]
Next, the vibration damping member 21 according to the second embodiment of the present invention will be described.
In addition, the same code | symbol is attached | subjected to the same component as 1st embodiment, and detailed description is abbreviate | omitted.
The damping member 21 of the present embodiment is different from the damping member 1 of the first embodiment in the core material 23.

As shown in FIG. 7, the core material 3 on which the wavy mountain 5 is formed is a laminated plate in which a first corrugated plate 23 a and a second corrugated plate 23 b are laminated in the thickness direction.
Specifically, on the first corrugated plate 23a, the first wave mountain 25a and the second wave mountain 25b are alternately arranged in the direction of the axis P from one side (left side toward the paper surface of FIG. 7) to the other. Is formed. The second corrugated plate 23b is alternately formed with second wave peaks 25b and first wave peaks 25a in the direction of the axis P from the other side to the other side.

  The shapes of the wave peaks 5 are determined so that the curvature radius R1 on the mountain side of the first wave mountain 25a and the curvature radius R2 on the valley side of the second wave mountain 25b coincide. Accordingly, the first corrugated plate 23a and the second corrugated plate 23b are arranged so that the peak side of the first corrugated mountain 25a in the first corrugated plate 23a enters the valley side of the second corrugated mountain 25b in the second corrugated plate 23b. Are stacked in a state in which the first corrugated plate 23a and the second corrugated plate 23b are in contact with each other without any gap.

According to such a damping member 21, the core member 23 is manufactured by bending a plate material by press molding, for example.
Here, since the core material 23 is a laminated plate, the yield strength can be improved even if the thickness of each of the first corrugated plate 23a and the second corrugated plate 23b is reduced.

  Further, by bending each of the first corrugated sheet 23a and the second corrugated sheet 23b and then laminating them, the bending process can be easily performed.

Furthermore, the freedom degree of the yield strength adjustment of the core material 23 increases by adjusting suitably the thickness of each corrugated sheet to be laminated, and the number of corrugated sheets to be laminated.
Specifically, for example, three corrugated plates may be laminated as shown in FIG. 8, that is, in addition to the first corrugated plate 23a and the second corrugated plate 23b, a third corrugated plate 23c is provided. Provide further. In the third corrugated plate 23c, third wave peaks 25c and fourth wave peaks 25d are alternately formed in the direction of the axis P from one to the other. Then, the curvature radius R3 on the mountain side of the second wave mountain 25b and the curvature radius R5 on the valley side of the third wave mountain 25c coincide with each other, and the curvature radius R4 on the valley side of the first wave mountain 25a, The shapes of the wave peaks 25 are determined so that the curvature radius R6 on the peak side of the fourth wave peak 25d matches.

  According to the vibration damping member 21 of the present embodiment, the core material 23 can be easily processed while maintaining the yield strength, which leads to cost reduction due to improvement in manufacturability.

Although the embodiment of the present invention has been described in detail above, some design changes can be made without departing from the technical idea of the present invention.
For example, in the core material 3 (23), the wave mountain 5 (25) may not have a complete waveform. Specifically, an arc shape, a sine curve shape, a trapezoid shape, an uneven shape, and the like are exemplified. And the wave mountain 5 (25) of the same shape does not need to be located, and the pitch of the wave mountain 5 does not need to be equal intervals.

  Moreover, since the core material 3 (23) is formed by press-molding a steel plate as described above and is manufactured by cold working, it is preferable that SR (Stress Relieving) treatment be performed after the press working. As a result, distortion due to work hardening of the steel sheet caused by cold working can be removed, and yield strength as designed can be obtained.

DESCRIPTION OF SYMBOLS 1 ... Damping member 3 ... Core material 4 ... Restraining member 4a ... Small diameter part 5 ... Wave mountain 7 ... End member 7a ... Contact part 10 ... Wave shape holding member 11 ... Convex head 11a ... Curved surface 12 ... Base part 15 ... Intermediate fixing member P ... Axis 21 ... Damping member 23 ... Core material 23a ... First corrugated plate 23b ... Second corrugated plate 23c ... Third corrugated plate 25 ... Wave mountain 25a ... First wave mountain 25b ... First 2nd wave mountain 25c ... 3rd wave mountain 25d ... 4th wave mountain R1, R2, R3, R4, R5, R6 ... radius of curvature

Claims (6)

A core material that extends along the axis and is formed into a corrugated plate shape in which the wave peaks are alternately continuous toward the direction of the axis;
A restraining member that extends along the axis and covers the core from the outer peripheral side in a state where both ends of the axis of the core are protruded,
A wave-shaped holding member that is arranged on the valley side of the corrugation in the core material, has a convex head that contacts the core material, and is provided so as to be relatively movable with respect to the inner surface of the restraining member;
With
The damping member according to claim 1, wherein a top portion of the undulation in the core material and an inner surface of the restraining member are not in contact with each other when no external force acts on the core material in the direction of the axis.   The top of the ridge in the core material and the inner surface of the restraining member are in contact with each other when an external force acts on the core material in the direction of the axis to cause a maximum amount of design deformation. The vibration damping member according to claim 1. 3. The vibration damping device according to claim 1, further comprising an intermediate fixing member that is provided at an intermediate position in the axial direction of the core material and fixes the core material and the restraining member at the intermediate position. Materials. The damping member according to any one of claims 1 to 3 , wherein a small-diameter portion is formed in the restraining member so that the inner diameter becomes smaller at both end portions in the direction of the axis. . The core material, the vibration damping member according to claim 1, any one of 4, wherein the plurality of corrugated plates is a laminated plate which are stacked. A core material used for the vibration damping member according to any one of claims 1 to 4 ,
A core material, characterized in that the core material is a laminated plate in which a plurality of corrugated plates are laminated.

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