Damping structure

Abstract

To provide a frame structure that retains damping performance and the necessary horizontal bearing capacity while taking into account design features.SOLUTION: A damping structure comprises: a diagonal member obliquely arranged in a frame surrounded by a first horizontal member, a second horizontal member and a vertical member connected to the first horizontal member and the second horizontal member; and a damping member provided at a joint part between the first horizontal member and the diagonal member and configured to absorb energy generated in the diagonal member by an external force acting on the frame. The damping member has a diagonal plate part joined to the diagonal member and having a long hole which is long in the horizontal direction, a pair of press-contact plate members holding the diagonal plate part, and a press-contact member for press-contacting the diagonal plate part and the pair of press-contact plate members through the long hole, and the long hole is located within the height range of the first horizontal member.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a damping structure. [Background Art]

[0002] When providing a brace member in a structure composed of columns (vertical members) and beams (horizontal members), generally, the cross-sectional size of the brace member is designed based on the allowable stress (allowable stress against tension and compression) determined from the rigidity balance of the structure. Further, as a damping structure for damping the vibration of the structure due to an external force (such as seismic force), a structure in which a friction damper is provided in the brace member is known (for example, see Patent Document 1). [Prior Art Documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-150183 [Summary of the Invention] [Problems to be Solved by the Invention]

[0004] When a friction damper is not provided in the brace member, if the cross-sectional size is increased to ensure the required allowable stress, the required allowable stress may further increase due to the rigidity balance of the structure. When the friction damper is provided at the axial portion of the brace member, the brace member may not be able to be thinned to the cross-sectional size required in terms of design. Further, since the members (such as disc springs) constituting the friction damper are provided at the axial portion of the brace member, it is not preferable in terms of design.

[0005] The present invention has been made in view of such problems, and an object thereof is to improve the designability. [Means for Solving the Problems]

[0006] The main invention for achieving the above objective is a damping structure comprising: a diagonal member arranged diagonally in a frame surrounded by a first horizontal member, a second horizontal member, and vertical members connected to the first horizontal member and the second horizontal member; and a damping member provided at the joint between the first horizontal member and the diagonal member, which absorbs energy generated in the diagonal member by an external force acting on the frame, wherein the damping member has a diagonal member plate portion joined to the diagonal member and having an elongated hole formed therein in the horizontal direction; a pair of pressure-welding plates that sandwich the diagonal member plate portion; and a pressure-welding member that penetrates the elongated hole and presses the diagonal member plate portion and the pair of pressure-welding plates together, wherein the elongated hole is located within the height range of the first horizontal member.

[0007] Other features of the present invention will be made clearer by description in this specification and the accompanying drawings. [Effects of the Invention]

[0008] According to the present invention, it is possible to improve the aesthetic appeal. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic diagram of the frame 10 provided with the damping structure of this embodiment. [Figure 2] Figure 1 is a perspective view of the area around the damping member 20. [Figure 3] Figure 2 is an exploded view. [Figure 4] Figure 1 is a front view of the area near the damping member 20. [Figure 5] Figure 5A is a section view of A in Figure 4, Figure 5B is a section view of B in Figure 4, and Figure 5C is a section view of C in Figure 4. [Figure 6] This figure shows the deformation of the frame 10 when an external force is applied to it. [Figure 7] This is a schematic diagram showing the frame 10 as viewed from the outside. [Modes for carrying out the invention]

[0010] This specification and the accompanying drawings make it clear at least the following:

[0011] A damping structure comprising: a diagonal member positioned diagonally in a frame surrounded by a first horizontal member, a second horizontal member, and vertical members connected to the first horizontal member and the second horizontal member; and a damping member provided at the joint between the first horizontal member and the diagonal member, which absorbs energy generated in the diagonal member by an external force acting on the frame, wherein the damping member has a diagonal member plate portion joined to the diagonal member and having an elongated hole formed therein in the horizontal direction; a pair of pressure-welding plates that sandwich the diagonal member plate portion; and a pressure-welding member that penetrates the elongated hole and presses the diagonal member plate portion and the pair of pressure-welding plates together, wherein the elongated hole is located within the height range of the first horizontal member.

[0012] This type of damping structure allows the damping members to be made less conspicuous, thereby improving the aesthetic appeal.

[0013] In such a damping structure, it is desirable that the pressure contact member has a disc spring, and that the disc spring is also located within the height range of the horizontal member.

[0014] Such a damping structure allows for further improvement in design aesthetics.

[0015] In such a damping structure, it is desirable that neither the first horizontal member nor the second horizontal member bears the load.

[0016] With this damping structure, the cross-sectional size of either the first horizontal member or the second horizontal member can be reduced (made thinner).

[0017] In such a damping structure, it is desirable that the first horizontal member and the second horizontal member do not bear the load.

[0018] With this damping structure, the cross-sectional size of both the first horizontal member and the second horizontal member can be reduced (made thinner).

[0019] Such a damping structure, wherein the pressure contact member has a bolt passing through the long hole, and it is desirable that the width of the long hole is larger than the diameter of the bolt.

[0020] According to such a damping structure, it is possible to cope with (absorb energy) deformation in the vertical direction.

[0021] Such a damping structure, in the framework, it is desirable that the diagonal member is provided in a V shape or an inverted V shape, and the damping member is provided at the joint between the top of the V-shaped or inverted V-shaped diagonal member and the first horizontal member.

[0022] According to such a damping structure, the energy absorption efficiency can be improved. Also, the damping member can be made inconspicuous, and the design can be improved.

[0023] Such a damping structure, in the framework adjacent vertically across the first horizontal member, it is desirable that the diagonal member and the damping member are provided symmetrically above and below with respect to the first horizontal member.

[0024] According to such a damping structure, in two adjacent layers (frameworks) vertically, only one horizontal member (the first horizontal member) for installing the damping member is required. Thereby, the ease of adjustment is improved.

[0025] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0026] ===This Embodiment=== <Regarding the configuration of the framework 10> Figure 1 is a schematic diagram of the frame 10 (two layers) equipped with the damping structure of this embodiment. Figure 2 is a perspective view of the area around the damping member 20 in Figure 1, and Figure 3 is an exploded view of Figure 2. Note that Figure 3 omits the illustration of the pressure contact member 23 of the damping member 20. In the following description, the vertical and horizontal directions are defined as being orthogonal to each other, as shown in Figure 1. Furthermore, of the directions orthogonal to the vertical and horizontal directions (normal directions of the paper), the side on which the frame 10 appears as in Figure 1 is defined as the inside (for example, the indoor side), and the opposite side is defined as the outside (for example, the outdoor side) (see Figures 2 and 3).

[0027] The frame 10 is composed of columns 12 and beams 14.

[0028] The columns 12 (corresponding to vertical members) are steel columns made of H-shaped steel, and are installed with spacing between them on the left and right sides, along the vertical direction. In this embodiment, the columns 12 are made of H-shaped steel, but are not limited to H-shaped steel, and other steel materials (for example, angle steel) may be used (the same applies to the beams 14 and bracing members 16 described later).

[0029] The beams 14 are steel beams made of H-shaped steel, spaced apart vertically and arranged along the left-right (horizontal) direction. Each beam 14 is connected to a column 12, thereby forming a frame 10 enclosed by the columns 12 and beams 14.

[0030] In this embodiment, the beams 14 are alternately provided with beams 14 on which damping members 20 (described later) are placed (hereinafter referred to as beam 14A) and beams 14 without damping members 20 (hereinafter referred to as beam 14B). Therefore, the frame 10 is more specifically surrounded by two columns 12 and beams 14A and 14B. Beam 14A corresponds to the first horizontal member, and beam 14B corresponds to the second horizontal member. In addition, the frame 10 is provided with bracing members 16 and damping members 20.

[0031] As shown in Figure 1, the frame 10, brace members 16, and damping members 20 are each provided symmetrically above and below. Below, we will mainly describe the configuration of the upper frame 10 (the configuration of the brace members 16, beams 14A, and damping members 20), but the lower frame 10 has the same configuration, only reversed vertically.

[0032] <Regarding brace material 16> The bracing members 16 (corresponding to diagonal members) are members that prevent deformation of the frame 10 due to external forces acting on the frame 10 (earthquakes, wind, etc.), and are installed diagonally to the columns 12 and beams 14. In this embodiment, H-shaped steel is used for the bracing members 16.

[0033] In this embodiment, the bracing members 16 are provided in a V-shape (a pair, left and right) in the frame 10 (V-shaped braces). Specifically, the upper end of the right bracing member 16 is joined to the joint between the right column 12 and beam 14 (beam 14B) (the upper right corner of the frame 10). The upper end of the left bracing member 16 is joined to the joint between the left column 12 and beam 14 (beam 14B) (the upper left corner of the frame 10). The lower end (top) of the V-shaped bracing member 16 is slidably connected to beam 14A via a damping member 20. A reinforcing plate (stiffener 17) is provided at the lower end of the bracing member 16 (the connection point with the damping member 20) (see Figures 2 and 3).

[0034] <Regarding beam 14A> As shown in Figures 2 and 3, the beam 14A is an H-shaped steel beam with a pair of flanges 142 at both ends (inner and outer ends) of the web 141. Furthermore, a portion of the inner flange 142 (the central portion: corresponding to the placement of the damping member 20) is cut out. This allows for adjustment of the contact force (control of the damping force) by the damping member 20 contact member 23 (described later). Also, as shown in Figures 2 and 3, the beam 14A is provided with a stiffener 32 and a gusset plate 34.

[0035] The stiffener 32 is a reinforcing plate for fixing the gusset plate 34 to the beam 14A, and is sandwiched (joined) by a pair of flanges 142 and also joined to the web 141. The stiffener 32 is also positioned parallel to the cross-section of the beam 14A.

[0036] The gusset plate 34 is a rectangular steel plate used to attach the splice plate 22 of the damping member 20 (described later) to the beam 14A. One side (bottom side) is joined to the web 141, and the other side (side in the left-right direction) is joined to the stiffener 32. By joining the rectangular gusset plate 34 to the beam 14A and the stiffener 32 (joining two sides), it can be fixed to the beam 14A more securely than if only the bottom side were joined.

[0037] Furthermore, the gusset plate 34 is provided with multiple (four in this case) through holes 34a that penetrate in the thickness direction. The through holes 34a are located at positions corresponding to the through holes 22b (described later) of the splice plate 22 of the damping member 20.

[0038] <Regarding damping member 20> Figure 4 is a front view (viewed from the inside) of the area around the damping member 20 in Figure 1, Figure 5A is a cross-sectional view A of Figure 4, Figure 5B is a cross-sectional view B of Figure 4, and Figure 5C is a cross-sectional view C of Figure 4. The configuration of the damping member 20 will be described below with reference to Figures 2 and 3.

[0039] The damping member 20 is a friction damper that absorbs the energy of the axial force (compressive force, tensile force) generated in the brace member 16 due to the external force acting on the frame 10.

[0040] The damping member 20 includes a brace joint plate 21 (corresponding to the diagonal member portion), a splice plate 22 (corresponding to the pressure-welded plate material), and a pressure-welded member 23.

[0041] The brace joining plate 21 is a plate-shaped member with a predetermined coefficient of friction and is joined to the lower ends (tops of the V-shape) of the pair of brace members 16. The method of joining to the brace members 16 is not particularly limited and may be, for example, by welding or by joining with bolts.

[0042] Furthermore, the brace joint plate 21 has a long through hole (hereinafter referred to as the elongated hole 21a) formed below the joint portion with the brace material 16, extending in the left-right direction (horizontally). The bolt 232 of the pressure welding member 23, which will be described later, is inserted through this elongated hole 21a. In other words, the bolt 232 passes through the elongated hole 21a.

[0043] The splice plates 22 are elongated rectangular plates in the left-right direction, and a pair is provided to sandwich the brace joint plate 21. Each pair of splice plates 22 is provided with through holes 22a and 22b.

[0044] Multiple through holes 22a are formed in a row (three in this case) in the left-right direction. These through holes 22a are for passing the bolts 232 (described later) of the pressure-welding member 23 through, and are formed to be approximately the same size as the bolt diameter of the bolts 232.

[0045] Multiple through-holes 22b are provided at the left and right ends of the splice plate 22, corresponding to the through-holes 142a of the gusset plate 34 (in this case, four on each side).

[0046] A pair of splice plates 22 are fixed to the gusset plate 34 of the beam 14A. More specifically, the pair of splice plates 22 are positioned on the gusset plate 34 so as to sandwich the gusset plate 34 and the brace joint plate 21 (the portion forming the elongated hole 21a). Bolts 35 are inserted through the through holes 22b of the pair of splice plates 22 and the through holes 34a of the gusset plate 34 and secured with nuts 36.

[0047] Furthermore, the pair of splice plates 22 are pressed against the brace joint plate 21 by the pressure contact member 23, and the brace joint plate 21 is slidably clamped between them.

[0048] The pressure-welding member 23 is a member that presses (pressure-welds) a pair of splice plates 22 and a brace joint plate 21 in the overlapping direction, and is equipped with a disc spring 231, a bolt 232, and a nut 233.

[0049] The disc spring 231 is composed of multiple stacked disc-shaped springs. However, it is not limited to this and may be formed from a single layer. The disc spring 231 is deformed by bending when tightened by the bolt 232 and nut 233. This deformation generates a compressive force in the disc spring 231.

[0050] The bolt 232 passes through the through-hole 22a of the pair of splice plates 22 and the elongated hole 21a of the brace joint plate 21 and is joined to the nut 233. Then, by tightening the nut 233 onto the bolt 232, the disc spring 231 is compressed, and the pair of splice plates 22 are pressed against the brace joint plate 21.

[0051] Therefore, the optimal pressure (compression force) can be applied to the disc spring 231 by adjusting the degree of tightening of the nut 233. In this embodiment, as described above, the inner flange 142 of the beam 14A is notched, making it easy to adjust the tightness of the nut 233.

[0052] Furthermore, the length D1 of the elongated hole 21a in the brace joint plate 21 shown in Figure 3 is longer than the distance D2 between the left and right ends of the three through holes 22a in the splice plate 22. In other words, the length D1 of the elongated hole 21a is longer than the distance between the left and right ends of the three bolts 232 that are aligned in the left and right direction. As a result, the brace joint plate 21 and the splice plate 22 (in other words, the brace material 16 and the beam 14A) can slide (relatively displace) in the left and right direction.

[0053] Furthermore, the width W (vertical length) of the elongated hole 21a is greater than the diameter of the bolt 232. Specifically, the diameter of the bolt 232 in this embodiment is 30 mm, and the width W of the elongated hole 21a is 50 mm. As a result, the brace joint plate 21 and the splice plate 22 (in other words, the brace material 16 and the beam 14A) can slide (relatively displace) in the width direction (vertical direction) of the elongated hole 21a.

[0054] With the above configuration, the damping member 20 (friction damper) presses a pair of splice plates 22 against the brace joint plate 21 with a pressure contact member 23, and absorbs vibration energy by utilizing the frictional force generated between the brace joint plate 21 and the splice plates 22.

[0055] Figure 6 shows an example of deformation when an external force is applied to the frame 10. The dashed lines in the figure show the state before deformation, and the solid lines show the state after deformation.

[0056] For example, in the upper frame 10 of the diagram, an external force (shear force) is acting from left to right, causing column 12 to rotate relative to beam 14A. This displacement causes frame 10 to deform from a rectangle to a parallelogram, and beam 14B moves to the right and also downwards. Consequently, the brace member 16 also undergoes deformation in both the horizontal direction (right) and the vertical direction (downward).

[0057] In this embodiment, by making the width W (length in the vertical direction) of the elongated hole 21a larger than the diameter of the bolt 232, sliding is possible not only in the left-right direction but also in the vertical direction. Therefore, such vertical and vertical deformations can be accommodated (vibration energy can be absorbed).

[0058] When deformation occurs in the direction shown in the diagram, a compressive force acts on the left brace member 16, and a tensile force acts on the right brace member 16. In this case, the cross-sectional size of the brace member 16 and the damping force provided by the damping member 20 (specifically, the pressure-welding member 23) are set so that buckling does not occur under compressive force and yielding does not occur under tensile force.

[0059] Furthermore, as shown in the lower diagram of Figure 6, the lower frame 10 undergoes deformation opposite to that of the upper frame. That is, deformation occurs both horizontally (left side) and vertically (upper side). In this case as well, the damping member 20 provided on the lower frame 10 can absorb the energy in the same way.

[0060] In this embodiment, bracing members 16 are provided in a V-shape (a pair, left and right) on the frame 10 enclosed by columns 12 and beams 14, and damping members 20 are provided at the joint between the tops of the V-shaped bracing members 16 and the beams 14A. By arranging them in this way, it is possible to increase the energy absorption efficiency compared to when dampers are arranged in the axial direction of the bracing members 16.

[0061] Furthermore, as shown in Figure 4 and other figures, the disc spring 231 and elongated hole 21a of the damping member 20 are located within the height range of the beam 14A (width of the flange 142). This makes the damper less conspicuous compared to when the friction damper (elongated hole and disc spring) is placed on the brace member 16. Thus, the aesthetic appearance can be improved.

[0062] Figure 7 is a schematic diagram of the frame 10 as viewed from the outside. As shown in Figure 7, when viewed from the outside, the damping member 20 is hidden (not visible) by the outer flange 142 of the beam 14A. Therefore, the aesthetic appearance is further improved when viewed from the outside.

[0063] Furthermore, in this embodiment, since the damping member 20 is provided at the joint between the beam 14A and the brace member 16, there are no constraints like those when installing a damper (such as a disc spring) on ​​the brace member 16, making it possible to set the cross-sectional size of the brace member 16 to be smaller (thinner).

[0064] Furthermore, it is desirable that either beam 14A or beam 14B (preferably both) is not connected to the flooring material (i.e., does not bear the live load). This allows the cross-sectional size of beam 14 (beams 14A and 14B) to be reduced (thinner).

[0065] ===Regarding other embodiments=== The embodiments described above are provided to facilitate understanding of the present invention and are not intended to limit its interpretation. The present invention can be modified and improved without departing from its spirit, and it goes without saying that equivalents thereof are included. In particular, embodiments described below are also included in the present invention.

[0066] In the above-described embodiment, the bracing members 16 were provided in a V-shape on the upper frame 10 and in an inverted V-shape on the lower frame 10 (symmetrical vertically with respect to beam 14A), but this is not limited to this. For example, the bracing members 16 may be provided in a V-shape (or inverted V-shape) on each floor. However, in this case, damping members 20 would be provided on the beams 14 of each floor. By making it symmetrical vertically as in this embodiment, only one beam 14 (beam 14A) is needed to install the damping member 20 in vertically adjacent frames 10. This improves the ease of adjustment. Also, since there is a beam 14 (beam 14B) that does not have a damping member 20 installed, steel materials other than H-shaped steel can be used for that beam 14. [Explanation of Symbols]

[0067] 10 Frame 12 Columns (Vertical Members) 14 Beam 14A Beam (First horizontal member) 14B Beam (Second Horizontal Member) 16. Bracing material (diagonal brace) 17 Stifle 20 Damping member 21. Brace joint plate (diagonal brace plate section) 21a long hole 22. Splice plate (pressure welding plate material) 22a Through hole 22b Through hole 23. Pressure-welded member 32 Stifle 34 Gusset Plates 34a through hole 35 volts 36 nuts 141 Web 142 Flange 231 Disc spring 232 volts 233 Nut

Claims

1. A diagonal member is positioned diagonally within a frame enclosed by a first horizontal member, a second horizontal member, and vertical members connected to the first and second horizontal members. A damping member is provided at the joint between the first horizontal member and the diagonal member, which absorbs energy generated in the diagonal member by external forces acting on the frame, A damping structure comprising, The damping member is A diagonal member plate portion is joined to the aforementioned diagonal member and has an elongated hole formed in the horizontal direction, A pair of pressure-welding plates that clamp the aforementioned diagonal plate portion, A pressure-welding member that penetrates the elongated hole and presses the diagonal plate portion and the pair of pressure-welding plates together, It has, The elongated hole is located within the height range of the first horizontal member. A damping structure characterized by the following features.

2. The damping structure according to claim 1, The aforementioned pressure contact member has a disc spring, The disc spring is also located within the height range of the first horizontal member. A damping structure characterized by the following features.

3. The damping structure according to claim 1, Either the first horizontal member or the second horizontal member does not bear the load. A damping structure characterized by the following features.

4. The damping structure according to claim 1, The first horizontal member and the second horizontal member do not bear the load. A damping structure characterized by the following features.

5. The damping structure according to claim 1, The aforementioned pressure-welding member has a bolt that passes through the elongated hole, The width of the elongated hole is greater than the diameter of the bolt. A damping structure characterized by the following features.

6. A damping structure according to any one of claims 1 to 5, In the aforementioned frame, the diagonal members are provided in a V-shape or inverted V-shape. The damping member is provided at the joint between the top of the V-shaped or inverted V-shaped diagonal member and the first horizontal member. A damping structure characterized by the following features.

7. The damping structure according to claim 6, In the frame structure adjacent to the first horizontal member in the vertical direction, the diagonal member and the damping member are provided symmetrically above and below the first horizontal member. A damping structure characterized by the following features.

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