Vibration control structure

Abstract

To efficiently increase damping capacity for vertical vibration between a floor member and a floor structure.SOLUTION: A vibration control structure disposed between a floor member and a floor structure comprises: a first member having one end pin-connected to the floor structure and rotatable around a first rotation axis via the pin connection; a second member having one end pin-connected to the floor member and rotatable around a second rotation axis via the pin connection, in which the second rotation axis is parallel to the first rotation axis; and a viscoelastic damper connecting the other ends of the first and second members.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to vibration damping structures. [Background technology]

[0002] A vibration control structure is known in which a viscoelastic damper, which is made by sandwiching a viscoelastic body between a plurality of parallel-arranged steel plates, is provided between two members. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-256577 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the conventional technology as described above, it is not possible to efficiently increase the amount of shear deformation of the viscoelastic damper per unit amount of relative displacement in the vertical direction between two members, and it is not possible to efficiently improve the damping capacity against vertical vibrations between two members.

[0005] Therefore, an object of the present disclosure is to efficiently increase the damping capacity against vertical vibration between a floor member and a floor structure. [Means for solving the problem]

[0006] According to one aspect, there is provided a vibration damping structure disposed between a floor member and a floor structure, comprising: A first member having one end pin-connected to the floor structure and capable of rotating about a first rotation axis by the pin connection; A second member, one end of which is pin-connected to the floor member and which is rotatable about a second rotation axis by the pin connection, the second rotation axis being parallel to the first rotation axis; A vibration control structure is provided, comprising: a viscoelastic damper connecting the other ends of the first member and the second member. Effect of the Invention

[0007] According to the present disclosure, it is possible to efficiently increase the damping capacity against vertical vibration between a floor member and a floor structure. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic side view of a building. [Diagram 2] 2 is an enlarged view of part Q1 in FIG. 1 and is a side view (plan view seen in the Y direction) of the vibration damping structure. [Diagram 3] 3 is another side view (plan view seen in the X direction) of the vibration damping structure corresponding to FIG. 2. [Figure 4] 4 is a cross-sectional view passing through one viscoelastic body of the vibration damping structure, taken along the XZ plane. FIG. [Diagram 5] 4A and 4B are diagrams showing the first arm and the second arm of the vibration damping structure in their respective individual states. [Figure 6] FIG. 2 is a diagram showing the state of each of the viscoelastic body and the steel plate of the vibration damping structure individually. [Figure 7] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Each embodiment will be described in detail below with reference to the accompanying drawings.

[0010] Fig. 1 is a schematic side view of a building 1. In Fig. 1, three axes, X, Y, and Z, which are orthogonal to each other in a right-handed coordinate system, are indicated. In the following Fig. 2 and the like, a similar three-axis notation may be used as appropriate. The Z direction corresponds to the up-down direction.

[0011] The building 1 may be any structure as long as it has the floor members 2 and floor structure 3 described below, and may be, for example, a relatively high-rise building such as an apartment building or a building, a single-story building, or an underground structure. The external shape and detailed structure of the foundation of the building 1 are arbitrary. In this embodiment, as an example, the building 1 is one-story above ground, as shown diagrammatically in FIG. 1.

[0012] The building 1 has a floor member 2, a floor structure 3, and a vibration control structure 4.

[0013] The floor member 2 extends in a horizontal plane (XY plane). The floor member 2 may be configured with two or more layers. The floor member 2 may be made of any material, such as wood or stone flooring, and may have a carpet or the like laid on the upper side.

[0014] The floor structure 3 extends below the floor section 2. The floor structure 3 may for example be a floor slab.

[0015] The vibration-damping structure 4 is provided between the floor member 2 and the floor structure 3. The floor member 2 is supported by the floor structure 3 via the vibration-damping structure 4. A support member other than the vibration-damping structure 4 may be provided between the floor member 2 and the floor structure 3, but there may be no support member other than the vibration-damping structure 4. In this embodiment, the support structure between the floor member 2 and the floor structure 3 is assumed to be the vibration-damping structure 4 only.

[0016] The vibration-damping structure 4 acts against relative displacement between the floor member 2 and the floor structure 3. Specifically, the vibration-damping structure 4 damps vibrations between the floor member 2 and the floor structure 3. The vibration-damping structure 4 is shown very diagrammatically in Fig. 1, and will be described in detail from Fig. 2 onwards.

[0017] Fig. 2 is an enlarged view of part Q1 in Fig. 1, and is a side view (plan view seen in the Y direction) of the vibration-damping structure 4. Fig. 3 is another side view (plan view seen in the X direction) of the vibration-damping structure 4 corresponding to Fig. 2. Fig. 4 is a cross-sectional view passing through one viscoelastic body 54 of the vibration-damping structure 4, and is a cross-sectional view along the XZ plane. Fig. 5 is a diagram showing the first arm 51 and the second arm 52 of the vibration-damping structure 4 in their respective individual states. Fig. 6 is a diagram showing the viscoelastic body 54 and the steel plate 55 of the vibration-damping structure 4 in their respective individual states.

[0018] In this embodiment, the vibration control structure 4 includes a damping element 5 and a spring element 6. A plurality of damping elements 5 and spring elements 6 may be provided for one floor member 2. For example, depending on the deformation mode of the floor member 2 (particularly the main deformation mode of the vibration control target), the damping elements 5 and spring elements 6 may be provided at each of a plurality of locations where the amount of deformation in the vertical direction is relatively large. In the following, unless otherwise specified, one damping element 5 and one spring element 6 will be described.

[0019] The damping element 5 includes a first arm 51 , a second arm 52 , and a viscoelastic damper 53 .

[0020] One end of the first arm 51 is pin-connected to the floor member 2. The first arm 51 is rotatable around a first rotation axis C1 by the pin connection. In this embodiment, the first arm 51 is fixed by a bolt BT1 to a fixing part 21 that is fixed to the floor member 2. In this case, the axis of the bolt BT1 forms the first rotation axis C1.

[0021] In this embodiment, the first arm 51 includes a first flat plate portion 510, a first pin coupling portion 512, and a first flange portion 514, as shown in FIG.

[0022] The first flat plate portion 510 extends along the XZ plane. The first flat plate portion 510 has a flat shape along the XZ plane, but may have unevenness, bent portions, or the like. The plate thickness of the first flat plate portion 510 is arbitrary, and may be, for example, about 16 mm. The first flat plate portion 510 has a fixing region R51 (see FIG. 5) of the viscoelastic damper 53 at an end portion farther from the first rotation axis C1 when viewed in the Y direction. The first flat plate portion 510 faces the second arm 52 (second flat plate portion 520) described later in the Y direction, and has the fixing region R51 of the viscoelastic damper 53 on the surface facing the second flat plate portion 520. In this embodiment, the fixing region R51 is a circle corresponding to the shape of the viscoelastic damper 53 (shape when viewed in the Y direction). In FIG. 5, the center of the fixing region R51 is indicated by a cross mark.

[0023] The first pin coupling portion 512 forms a bolt fixing portion (fastening portion). The first pin coupling portion 512 extends along the XZ plane. The first pin coupling portion 512 has a bolt hole 5122 that penetrates in the Y direction. The first pin coupling portion 512 forms a seat surface for the bolt BT1 around the bolt hole 5122.

[0024] The first flange portion 514 is provided between the first flat plate portion 510 and the first pin coupling portion 512. The first flange portion 514 extends along the YZ plane. The first flange portion 514 has a function of increasing the strength and rigidity of the first arm 51.

[0025] One end of the second arm 52 is pin-connected to the floor structure 3. The second arm 52 is rotatable around the second rotation axis C2 by the pin connection. In this embodiment, the second arm 52 is fixed to a fixing part 31 fixed to the floor structure 3 by a bolt BT2. In this case, the axis of the bolt BT2 forms the second rotation axis C2. The second rotation axis C2 is parallel to the first rotation axis C1, and the line connecting the first rotation axis C1 and the second rotation axis C2 is parallel to the vertical line (line along the direction of gravity) Lv.

[0026] In this embodiment, the second arm 52 includes a second flat plate portion 520, a second pin coupling portion 522, and a second flange portion 524, as shown in FIG.

[0027] The second flat plate portion 520 extends along the XZ plane. The second flat plate portion 520 has a flat shape along the XZ plane, but may have unevenness, bent portions, or the like. The plate thickness of the second flat plate portion 520 is arbitrary, but may be, for example, about 16 mm. The second flat plate portion 520 has a fixing region R52 (see FIG. 5) of the viscoelastic damper 53 at an end portion farther from the second rotation axis C2 as viewed in the Y direction. The second flat plate portion 520 faces the first flat plate portion 510 of the first arm 51 in the Y direction, and has the fixing region R52 of the viscoelastic damper 53 on the surface facing the first flat plate portion 510. The fixing region R52 on the second flat plate portion 520 side faces the fixing region R51 on the first flat plate portion 510 side as viewed in the Y direction. In this embodiment, the fixing region R52 is a circle corresponding to the shape of the viscoelastic damper 53 (as viewed in the Y direction). In FIG. 5, the center of the fixed region R52 is indicated by a cross mark.

[0028] The second pin coupling portion 522 forms a bolt fixing portion (fastening portion). The second pin coupling portion 522 extends along the XZ plane. The second pin coupling portion 522 has a bolt hole 5222 penetrating in the Y direction. The second pin coupling portion 522 forms a seat surface for the bolt BT2 around the bolt hole 5222.

[0029] The second flange portion 524 is provided between the second flat plate portion 520 and the second pin coupling portion 522. The second flange portion 524 extends along the YZ plane. The second flange portion 524 has a function of increasing the strength and rigidity of the second arm 52.

[0030] 3, the second arm 52 is provided at a position in the Y direction different from that of the first arm 51. In this case, the first flange portion 514 and the second flange portion 524 are offset from each other in the Y direction so as not to overlap in the vertical direction.

[0031] In this embodiment, as described above, one end of each of the first arm 51 and the second arm 52 is pin-connected to the floor member 2 and the floor structure 3, respectively. On the other hand, the other ends of the first arm 51 and the second arm 52 are connected to each other via a viscoelastic damper 53, which will be described later. That is, the first arm 51 and the second arm 52 are connected to each other via the viscoelastic damper 53 at the fixing regions R51 and R52 described above.

[0032] As described above, the viscoelastic damper 53 connects the first arm 51 and the second arm 52. Specifically, one end of the viscoelastic damper 53 in the Y direction is fixed to the fixed region R51 of the first arm 51, and the other end of the viscoelastic damper 53 in the Y direction is fixed to the fixed region R52 of the second arm 52. As a result, the first arm 51 and the second arm 52 are allowed to rotate around the first rotation axis C1 and the second rotation axis C2, and can rotate (open and close) around the center (the center of the fixed regions R51 and R52) of the viscoelastic damper 53 as viewed in the Y direction. That is, the viscoelastic damper 53 can rotate in a manner similar to that of a pair of "sumo scissors" when it is assumed that there is a "blade" on each side of the first rotation axis C1 and the second rotation axis C2. The function (damping effect) of the viscoelastic damper 53 working during such rotation will be described later.

[0033] As shown in FIG. 3, the viscoelastic damper 53 has a plurality of layers of viscoelastic bodies 54 laminated via a steel plate 55. The viscoelastic bodies 54 and the steel plate 55 adjacent to each other in the Y direction are in surface contact with each other and are bonded over the entire contact surface. The number of viscoelastic bodies 54 (the number of layers) is arbitrary and may be adapted according to the required damping characteristics. The thickness of the viscoelastic body 54 is also arbitrary, and may be, for example, about 3 mm. The thickness of the steel plate 55 is also arbitrary, and may be, for example, within a range of about 3 mm to 8 mm. In this embodiment, the steel plate 55 and the viscoelastic body 54 are both circular when viewed in the Y direction, but may have different shapes. In this embodiment, the steel plate 55 is slightly larger than the viscoelastic body 54 (for example, the diameter of the steel plate 55 is about 200 mm, and the diameter of the viscoelastic body 54 is about 180 mm), but they may be approximately the same size.

[0034] Here, the floor member 2 is displaced relative to the floor structure 3 in a manner that causes it to vibrate vertically in response to the movement of people standing on it, etc. Such vibration becomes noticeable when the floor member 2 is used in a dance hall, gymnasium, etc.

[0035] In this embodiment, when the floor member 2 is displaced relative to the floor structure 3 in a manner that causes it to vibrate in the vertical direction, the viscoelastic damper 53 functions. Specifically, the first arm 51 and the second arm 52 rotate in an opening and closing manner with the vicinity of the center (the center of the fixed regions R51 and R52) of the viscoelastic damper 53 as the rotation axis when viewed in the Y direction. In other words, when the floor member 2 is displaced downward relative to the floor structure 3 during downward displacement of the vertical vibration, the first arm 51 and the second arm 52 rotate with the vicinity of the center of the viscoelastic damper 53 as the rotation axis with the first rotation axis C1 lowering downward. Also, when the floor member 2 is displaced upward relative to the floor structure 3 during upward displacement of the vertical vibration, the first arm 51 and the second arm 52 rotate with the vicinity of the center of the viscoelastic damper 53 as the rotation axis with the first rotation axis C1 rising upward.

[0036] In this way, when vertical vibration occurs, the viscoelastic damper 53 receives a shear force, and a damping effect is generated by the viscoelastic damper 53. Specifically, when the first arm 51 and the second arm 52 rotate from the neutral position around the center of the viscoelastic damper 53 (the center of the fixed regions R51 and R52) as the rotation axis during downward displacement of the vertical vibration, the viscoelastic damper 53 receives a shear force, and shear strain is generated in the viscoelastic damper 53. Thereafter, when the viscoelastic damper 53 returns to the neutral position during the vertical vibration, the viscoelastic damper 53 is released from the shear strain. Then, when the first arm 51 and the second arm 52 rotate from the neutral position around the center of the viscoelastic damper 53 (the center of the fixed regions R51 and R52) as the rotation axis during upward displacement of the vertical vibration, the viscoelastic damper 53 receives a shear force, and shear strain is generated in the viscoelastic damper 53.

[0037] At this time, during the upward and downward vibrations, the shear force that viscoelastic damper 53 receives is in the opposite direction, and the shear strain that occurs in viscoelastic damper 53 is also in the opposite direction. The damping effect of viscoelastic damper 53 is produced by the change (vibrational change) in the shear strain that occurs in viscoelastic damper 53 due to such upward and downward vibrations.

[0038] In this embodiment, as described above, the fixing regions R51, R52 are set in the first flat plate portion 510 and the second flat plate portion 520 which are different from the first pin coupling portion 512 and the second pin coupling portion 522. Therefore, the viscoelastic damper 53 is disposed offset with respect to the first rotation axis C1 and the second rotation axis C2.

[0039] In this case, the viscoelastic damper 53 can amplify the shear strain generated in the viscoelastic damper 53 with an amplification factor according to the offset amount (see arm length L1 in Figure 5) with respect to the first rotation axis C1 and the second rotation axis C2.

[0040] Therefore, according to this embodiment, it is possible to amplify the shear strain generated in the viscoelastic damper 53 up to the nonlinear region where the damping effect is high, and the damping effect of the viscoelastic damper 53 can be efficiently increased.

[0041] Furthermore, according to this embodiment, the first arm 51 and the second arm 52 have the arm length L1 mainly along the X direction, so even if the arm length L1 is made relatively large, the dimension in the Y direction is unlikely to become excessively large. Therefore, according to this embodiment, even if the distance in the Y direction between the floor member 2 and the floor structure 3 is relatively small, the damping effect of the viscoelastic damper 53 can be efficiently increased.

[0042] According to this embodiment, as described above, the first flange portion 514 and the second flange portion 524 are offset from each other in the Y direction so as not to overlap in the up-down direction. This prevents the first flange portion 514 and the second flange portion 524 from interfering with each other during the operation (damping operation) of the viscoelastic damper 53. That is, even if the first arm 51 and the second arm 52 rotate around the rotation axis near the center (the center of the fixed regions R51 and R52) of the viscoelastic damper 53, the first flange portion 514 and the second flange portion 524 do not interfere with each other. Therefore, according to this embodiment, it is possible to increase the strength and rigidity of the first arm 51 and the second arm 52 by the first flange portion 514 and the second flange portion 524, while making the rotation stroke of the first arm 51 and the second arm 52 relatively large.

[0043] The spring element 6 may be in the form of a coil spring, one end of which is connected to the floor member 2 and the other end of which is connected to the floor structure 3. However, in alternative embodiments, the spring element 6 may be in other forms, such as a leaf spring.

[0044] The spring elements 6 may be provided adjacent to the damping elements 5 in a paired manner. However, in a variant, the spring elements 6 and the damping elements 5 may be provided in different numbers and at separate locations.

[0045] According to this embodiment, since the vibration control structure 4 has the spring element 6 in addition to the damping element 5, when the floor member 2 is displaced relative to the floor structure 3 in a manner that causes it to vibrate in the up-down direction, not only the viscoelastic damper 53 but also the spring element 6 functions. This allows the amplitude of the floor member 2 to be reduced while being damped, thereby effectively enhancing the vibration control effect.

[0046] However, in a modified example, the spring element 6 may be omitted and the vibration control structure may be configured with only the damping element 5, as in a vibration control structure 4A shown in FIG.

[0047] Although each embodiment has been described above in detail, the present invention is not limited to the specific embodiment, and various modifications and changes are possible within the scope of the claims. In addition, it is also possible to combine all or a plurality of the components of the above-described embodiments.

[0048] For example, in the above-described embodiment, multiple damping elements 5 of the same configuration are provided between one floor member 2 and the floor structure 3, but they are different in configuration and utilize the above-described viscoelastic damper 53, but may also be combined with other damping elements. [Explanation of symbols]

[0049] 1 Building 2 Flooring 3 floor structure 4. 4A vibration-damping structure 5. Damping Elements 6 Spring elements 21 Fixed part 31 Fixed part 51 First arm (an example of a first member) 510 1st flat plate section 512 First pin joint 5122 Bolt hole 514 First flange part 52 Second arm (an example of the second member) 520 2nd flat plate part 522 Second pin joint 5222 Bolt hole 524 Second flange part 53 Viscoelastic Damper 54 Viscoelastic body 55 Steel plate C1 First rotation axis C2 Second rotation axis

Claims

1. A vibration damping structure disposed between a floor member and a floor structure, a first member having one end pin-connected to the floor member and being rotatable about a first rotation axis by the pin connection; a second member having one end pin-connected to the floor structure and capable of rotating about a second rotation axis by the pin connection, the second rotation axis being parallel to the first rotation axis; a viscoelastic damper connecting the other ends of the first member and the second member.

2. The first rotation axis and the second rotation axis are positioned on the same vertical line when viewed in the axial direction, The vibration control structure according to claim 1 , wherein the viscoelastic damper undergoes shear deformation in response to a relative displacement of the floor member relative to the floor structure in a vertical direction.

3. 2. The vibration control structure according to claim 1, wherein the viscoelastic damper has a plurality of layers of viscoelastic material laminated with steel plates interposed therebetween.

4. The first member is A first flat plate portion extending along a plane having a normal line in the direction of the first rotation axis; A first pin connection portion for the floor member; a first flange portion between the first flat plate portion and the first pin coupling portion, the first flange portion extending along a plane having a normal line in a direction intersecting with the first rotation axis, The second member is A second flat plate portion extending along a plane having a normal line in the direction of the second rotation axis; A second pin connection portion for the floor structure; a second flange portion between the second flat plate portion and the second pin coupling portion, the second flange portion extending along a plane having a normal line in a direction intersecting with the second rotation axis, The vibration damping structure according to claim 1 , wherein the first flange portion and the second flange portion are offset from each other in the direction of the first rotation axis so as not to overlap in the vertical direction.

5. The vibration damping structure according to any one of claims 1 to 4, further comprising a spring element having one end fixed to the floor member and the other end fixed to the floor structure, and capable of expanding and contracting vertically between the first member and the second member.

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