JP5977732B2 - Vibration control device for wooden buildings - Google Patents

Description

  The present invention relates to a vibration control device for a wooden building including a rectangular frame structure formed by a lower base or a lower beam member, a pair of left and right column members, and an upper beam member.

  The wall of the wooden building includes a rectangular frame structure formed by a lower base or lower beam member, a pair of left and right pillar members, and an upper beam member. As a vibration damping device that can be incorporated into such a rectangular frame structure of a wooden building, for example, as shown in Patent Document 1, the rectangular frame structure of a wooden building has a rectangular shape when the horizontal shaking occurs. A swing arm that is driven laterally around the support shaft in conjunction with a change in angle between the horizontal member and the vertical member forming the frame structure, and the swing arm is moved by swinging the swing arm. A buffer means for suppressing the swing of the swing arm is interposed between a fixed position on the rectangular frame structure side where the distance between the swing arm and the free end of the swing arm is free. Shaking devices are known. This type of vibration damping device is intended to suppress the shaking of the rectangular frame structure in the horizontal direction when the earthquake occurs by the buffer means.

JP 2004-263419 A

  In the conventional vibration damping device as described above, a hydraulic damper is used as a buffer means for suppressing the swing of the swing arm. In a conventional vibration damping device using such a hydraulic damper, it is necessary to prepare a hydraulic damper having characteristics necessary for obtaining a desired damping effect, and the cost required for the hydraulic damper is very high. Conversely, if you want to use an off-the-shelf general-purpose hydraulic damper, you must design a damping device that includes a swing arm and a mechanism that drives it according to the characteristics of the hydraulic damper. It becomes difficult to realize a vibration control device suitable for the above.

The present invention proposes a vibration control device for a wooden building that can solve the above-described conventional problems, and the vibration control device for a wooden building according to the present invention is an embodiment described later. In order to make it easier to understand the relationship, the reference numerals used in the description of the embodiment are indicated with parentheses, and when the rectangular frame structure (1) of the wooden building is swayed in the horizontal direction, The rocker is driven laterally around the support shaft in conjunction with the change in angle between the horizontal members (2, 3) and the vertical members (4, 5) forming the rectangular frame structure (1). a moving arm (9), rocking said a stereotactic location of the rectangular framework member (1) side distance is changed between the free end of the swinging arm (9) swing by the swing arm (9) between the free end of the rotating arm (9), the vibration damping device comprising by interposed to suppress buffering means the swinging of the swinging arm (9), taken on the horizontal member (2, 3) The first triangular member (7) attached and the pair of left and right vertical members (4, 5) are installed in an upside-down direction with respect to the first member (7) and the tops are in the vertical direction. Are provided with a triangular second member (8) that is adjacent to each other, and the swing arm (9) is a rod-shaped member that is long in the vertical direction, and one end and an intermediate position of the first member ( 7) and the top of the second member (8) adjacent to each other in the vertical direction are pivotally supported by the support shafts (31, 33), and these two support shafts (31, 33) pass through. Of the two holes, the hole through which one of the support shafts is formed as an elongated hole in the vertical direction, and the buffer means includes two U-shaped steel members (10A, 10B) positioned on both front and rear sides of the swing arm (9). Each of these two U-shaped steel members (10A, 10B) has one of both ends secured to the free end of the swing arm (9) by a common shaft (bolt nut (34)). And both ends The other of the first member (7) and the second member (8), the swing arm (9) of the member that pivotally supports the intermediate position of the swing arm (9) 9) The U-shaped steel members (10A, 10B) are centered with respect to both ends of the U-shaped steel materials (10A, 10B) by being fixed to the two left and right fixed positions. Is arranged so as to be bilaterally symmetric with respect to the swing arm (9) in a direction positioned on the side of the support shaft (31) supporting the intermediate position of the swing arm (9). It is a set configuration.

  According to the configuration of the present invention, since the buffer means is made of a U-shaped steel material, not only can it be implemented very inexpensively compared to a conventional hydraulic damper, but also the thickness can be reduced. Even in parallel with other mechanism members in the wall thickness direction, it is easy to make the whole thin, and it can be easily incorporated within the wall thickness range. In addition, the size of the rectangular frame structure composed of the lower foundation or the lower and upper beam members, and a pair of left and right column members connecting them, and the horizontal shaking force caused by an earthquake, etc. Correspondingly, the vibration suppression force required for the buffering means can be adjusted freely and easily by changing not only the overall size of the U-shaped steel material but also the properties of the steel material used, the plate thickness, the shape of the turn part, etc. Therefore, it is possible to easily and inexpensively implement vibration control devices of various scales.

  The U-shaped steel material may be formed by cutting a steel plate into a substantially U shape in which the distance between both ends coincides with the distance between the free end of the swing arm and the fixed position before the occurrence of the swing. Although it is possible, in terms of shape, the U-shaped steel material is composed of a central curved portion and a pair of straight portions connected to both ends of the curved portion, and the pair of straight portions is wide enough to move away from the curved portion. Or the U-shaped steel material is formed in a substantially trapezoidal shape from a central straight portion and a pair of straight portions connected to both ends of the central straight portion, and the pair of straight portions is the central straight portion. It can be formed wider than the part. In this way, as the rectangular frame structure swings in the lateral direction, the plastic deformation region when the U-shaped steel material opens and closes will break in a short time due to local fatigue due to concentration within a narrow range. It can be configured so that nothing happens.

Further , according to the configuration of the present invention, since the two U-shaped steel members (10A, 10B) in which the opening / closing motions associated with the swing of the swing arm (9) are reversed, one U-shaped steel member is provided. Since each U-shaped steel material can be made lighter and smaller than a steel material with a relatively thin plate thickness, it can be implemented as a vibration damping device that can be easily incorporated into the wall thickness. .

FIG. 1 is a front view showing a state in which a vibration damping device is attached to a predetermined position inside a rectangular frame structure in a wooden building. FIG. 2 is a partially longitudinal enlarged front view of the vibration damping device. FIG. 3 is an enlarged cross-sectional view taken along line AA in FIG. 4A is an enlarged sectional view taken along line BB in FIG. 2, and FIG. 4B is an enlarged sectional view taken along line CC in FIG. FIG. 5A and FIG. 5B are front views of main parts showing a state of the vibration damping device when the rectangular frame structure swings in the horizontal direction. 6A to 6D are front views showing modifications of the U-shaped steel material.

  An embodiment of the vibration damping device according to the present invention will be described with reference to the accompanying drawings. A rectangular frame structure 1 of a wooden building to which the vibration damping device according to the present invention is attached is shown in FIG. It is composed of a horizontal member 2 and an upper horizontal member 3 and a pair of left and right vertical members 4 and 5 disposed between the upper and lower members 2 and 3, and generally constitutes a wall of a building. The lower horizontal member 2 is a base fixed on a cloth foundation or a beam member disposed at an intermediate height of the building, and the upper horizontal member 3 is an intermediate height of the base or the building. The pair of right and left vertical members 4 and 5 are pillar members.

  When the lower half side in the rectangular frame structure 1 is used as an opening such as a doorway or a window, the vibration damping device 6 of the present invention is placed on the upper end side in the rectangular frame structure 1 as shown in FIG. Is incorporated. Of course, when an opening such as a window is provided on the upper half side of the rectangular frame structure 1, the vibration damping device 6 of the present invention is incorporated in the upside down direction on the lower end side of the rectangular frame structure 1. Hereinafter, an embodiment in which the vibration damping device 6 of the present invention is incorporated on the upper end side in the rectangular frame structure 1 will be described.

  The vibration damping device 6 includes a first member 7 attached to the center position of the lower inner surface of the upper horizontal member 3, a second member 8 horizontally installed between a pair of left and right vertical members 4, 5, and a swing arm 9 and a pair of left and right U-shaped steel materials 10A and 10B as buffer means.

  The first member 7 is an L-shaped member attached to the lower side of the mounting body 12 so as to form a mounting body 12 that is long in the lateral direction and an inverted isosceles triangle having the mounting body 12 as a base. 13. The mounting main body 12 has a gate shape in cross section in which both side plate portions 12b and 12c are bent downward from both sides of the strip-like plate portion 12a attached to the lower inner side surface of the upper horizontal member 3, L-shaped member mounting portions 12d and 12e are formed by increasing the downwardly extending heights of both end portions in the length direction of the plate portions 12b and 12c. The L-shaped member 13 is composed of a set of two L-shaped plate members 13 a and 13 b that are stacked with a space between each other, and both end portions thereof are in the L-shaped member mounting portions 12 d and 12 e of the mounting body 12. In an inserted state between the two side plate portions 12b and 12c, two bolt nuts 14a and 14b and L-shaped via spacers 15 which are loosely fitted to the bolts and maintain a distance between the L-shaped plate members 13a and 13b, respectively. It is fixed to the member mounting portions 12d and 12e. Note that the outer sides of the L-shaped plate members 13a and 13b are bent and reinforced so as to face each other.

  The second member 8 is an L-shaped member that is attached to the upper side of the mounting body 16 so as to form a mounting body 16 that is long in the lateral direction and an upright isosceles triangle with the mounting body 16 as a base. 17 and attachment members 18 and 19 attached to both ends of the attachment main body 16. The mounting body 16 is composed of a single plate material, and L-shaped member mounting portions 16a and 16b extending upward are formed at both ends thereof. Further, the lower side of the mounting main body 16 and the upper side between the L-shaped member mounting portions 16a and 16b are bent and reinforced to one side. The L-shaped member 17 is exactly the same as the L-shaped member 13 of the first member 7, and both ends of the pair of L-shaped plate members 17 a and 17 b are attached to the L-shaped member of the mounting body 16. A spacer 21 for positioning the L-shaped member mounting portions 16a, 16b at the center position between the L-shaped plate members 17a, 17b by loosely fitting the two bolt nuts 20a, 20b and the bolts with the portions 16a, 16b sandwiched therebetween. It is being fixed to the said L-shaped member attaching part 16a, 16b via.

  The mounting members 18 and 19 use two of the same structure in a bilaterally symmetrical direction, and each mounting member 18 and 19 is attached to the end of the second member 8 in the left-right length direction of the mounting body 16. The first mounting portion 22 to be mounted and the second mounting portion 23 to be mounted on the inner surface of the vertical members 4 and 5 are configured. The first attachment portion 22 is composed of a pair of attachment plates 22 a and 22 b that sandwich the end portion of the attachment main body 16 in the second member 8 from both sides, and the pair of attachment plates 22 a and 22 b are the end portions of the attachment main body 16. With the two long holes 24 in the left and right length direction provided in the mounting body 16 and the bolt nut 25 penetrating each of the long holes 24 in the left and right length direction of the mounting body 16. It is attached so that its position can be adjusted and fixed within the range of the length of the long hole 24. The second mounting portion 23 is composed of a single board 23a and a pair of mounting plates 23b having an L-shaped cross section that are attached to the board 23a by two upper and lower bolts and nuts 26 with the board 23a sandwiched from both sides. , 23c, and the lower end portion of the substrate 23a is sandwiched between the outer end portions of the pair of mounting plates 22a, 22b in the first mounting portion 22, and one is attached to the pair of mounting plates 22a, 22b. Are supported by a shaft (bolt nut) 27 so as to be swingable up and down.

  The swing arm 9 has a bar shape that is long in the vertical direction, and includes two plate members 9a and 9b that are stacked on each other, and a lower end position spacer 28 that is sandwiched and fixed between the lower ends of the two plate members 9a and 9b. An intermediate position spacer 29 sandwiched and fixed between the two plate members 9a and 9b at a position directly above the lower end position spacer 28, and an upper end position spacer 30 sandwiched and fixed between the upper ends of the two plate members 9a and 9b. ing. A support shaft (bolt nut) that penetrates the center of the intermediate position spacer 29 in a state where the swing arm 9 is inserted between the L-shaped plate members 13a and 13b of the L-shaped member 13 in the first member 7 upward from below. 31 is pivotally supported by the top of the lower end of the L-shaped member 13 in the first member 7 so as to be able to swing left and right. The top end of the L-shaped member 17 of the second member 8 is externally fitted to the bottom end of the swing arm 9, that is, the bottom end of the first member 7 protruding downward from the top of the bottom end of the L-shaped member 13. A lower end (L-shaped plate members 17a, 17b) of the swing arm 9 is supported by a support shaft (bolt nut) 33 that passes through a long hole 32 provided in the center of the position spacer 28 in parallel with the length direction of the swing arm 9. ) Is pivotally coupled to the top of the upper end of the L-shaped member 17 in the second member 8 so that it can be swung left and right and can be raised and lowered within the length of the long hole 32. At this time, the upper end of the swing arm 9 is located below the attachment main body 12 of the first member 7 with a small gap.

  The U-shaped steel members 10A and 10B have upper end portions on the side close to the swing arm 9 in a state of being symmetrically arranged with the first member 7 sandwiched from both sides and centered on the swing arm 9 that is vertically oriented. Is attached by a common bolt and nut 34 penetrating the center of the upper end position spacer 30 of the swing arm 9, and the other upper end portion connects the attachment main body 12 and the L-shaped member 13 in the first member 7. It is attached using the bolt nut 14a. The U-shaped steel members 10A and 10B attached in this manner cannot be freely rotated around the axis of the bolt nuts 34 and 14a by tightening the bolt nuts 34 and 14a. Bolt nuts 34 and 14a are used as bolts by using a large-diameter shaft portion formed adjacent to the bolt head so as to be able to rotate with respect to the shaft holes of the U-shaped steel materials 10A and 10B. Even when completely tightened, the U-shaped steel materials 10A and 10B can be configured to be freely rotatable around the axis of the bolt nuts 34 and 14a.

  When the vibration damping device 6 configured as described above is attached to the on-site rectangular framework structure 1, only the attachment main body 12 of the first member 7 is removed from the L-shaped member 13. Therefore, the U-shaped steel materials 10A and 10B are in a state where they are attached to the swing arm 9 side by the bolts and nuts 34 only. A plurality of attachment main bodies 12 of the first member 7 removed from the vibration damping device 6 in this state are provided on the inner side surface (lower side surface) of the upper horizontal member 3 of the rectangular frame structure 1 through the belt-like plate portion 12a. Fix with a coach screw etc. At this time, the center position in the length direction of the mounting main body 12 is set to the length of the upper horizontal member 3 by using a mark (such as a triangular opening) provided on the belt-like plate portion 12a of the mounting main body 12. Match the center position of the direction.

  Next, the swing arm 9 is pivotally supported by a support shaft (bolt nut) 31 and the second member 8 is suspended by a support shaft (bolt nut) 33 at the lower end of the swing arm 9. The L-shaped member 13 of the one member 7 is attached to the attachment main body 12 of the first member 7 attached to the inner surface of the upper horizontal member 3. That is, both end portions of the L-shaped member 13 are inserted into the L-shaped member mounting portions 12d and 12e on both ends of the mounting main body 12, and are respectively coupled by the bolt nuts 14a and 14b. The outer upper ends of the U-shaped steel materials 10A and 10B are connected to both ends of the mounting body 12. As a result, the entire vibration damping device 6 is suspended from the center of the inner surface of the upper horizontal member 3 of the rectangular frame structure 1 through the mounting body 12 of the first member 7, and the upper horizontal member 3. An intermediate swing fulcrum of the swing arm 9, that is, a support shaft (bolt nut) 31 is positioned on a virtual vertical line passing through the center position in the length direction.

  Finally, the second member 8 is installed between the inner surfaces of the pair of left and right vertical members 4 and 5 via a pair of left and right mounting members 18 and 19 provided in the second member 8. Reference numeral 19 denotes a state in which the bolt and nut 25 are loosened so as to be laterally movable within the length of the long hole 24 in the lateral direction with respect to the mounting body 16 of the second member 8. , 5 are marked (marked lines, etc.) indicating the mounting heights of the mounting members 18, 19 at positions separated from the upper horizontal member 3 by a predetermined distance. Accordingly, the first attachment portion 22 of each attachment member 18, 19 is laterally moved laterally relative to the attachment main body 16 of the second member 8, and the second attachment portion 23 (attachment) of each attachment member 18, 19 is attached. The plates 23b and 23c) are brought into contact with the inner surfaces of the pair of left and right vertical members 4 and 5, and the vertical members of the second mounting portion 23 (mounting plates 23b and 23c) using the mounting height indicating marks. In a state in which the heights of the inner surfaces 4 and 5 are adjusted, the second mounting portion 23 (mounting plates 23b and 23c) is attached to a predetermined height on the inner surfaces of the vertical members 4 and 5 with a coach screw or the like. Thereafter, the first mounting portion 22 of each of the mounting members 18 and 19 and the mounting body 16 of the second member 8 are fixed and integrated with each other by tightening the bolts and nuts 25, so that the vibration damping device for the rectangular frame structure 1 is obtained. 6 is completed.

  The vibration damping device 6 incorporated in the rectangular frame structure 1 as described above includes a support shaft (bolt nut) 31 that is an intermediate swing fulcrum of the swing arm 9 and a long hole 32 at the lower end of the swing arm 9. The supporting shaft (bolt nut) 33 that penetrates is on the same vertical line, the swing arm 9 stands vertically, and the support shaft (bolt nut) passes through the long hole 32 at the lower end of the swing arm 9. ) 33 is located slightly above the center position of the length of the long hole 32 in the vertical direction. In such a state, when the rectangular framework structure 1 swings in the horizontal direction due to the occurrence of an earthquake, as shown in FIGS. 5A and 5B, along with the horizontal horizontal swing motion of the upper horizontal member 3. The support shaft (bolt nut) 31 on the first member 7 side and the support shaft (bolt nut) 33 on the second member 8 side move relative to each other in the lateral direction, and the swing arm 9 is an intermediate swing support point. The upper horizontal member 3 swings around the support shaft (bolt nut) 31 on the first member 7 side. At this time, the support shaft (bolt nut) 33 on the second member 8 side relatively moves up and down in the long hole 32 on the swing arm 9 side, and the mounting body in each of the mounting members 18 and 19 of the second member 8. The first mounting portion 22 on the 16 side and the second mounting portion 23 fixed to the vertical members 4 and 5 side relatively swing around a support shaft (bolt nut) 27 between them. .

  The swinging motion of the swinging arm 9 in the horizontal direction when the earthquake occurs causes the U-shaped steel materials 10A and 10B to be deformed. That is, as shown in FIG. 5A, when the swing arm 9 swings to the left, the upper end of the left U-shaped steel member 10 is narrowed and the upper end of the right U-shaped steel member 11 is expanded. When the U-shaped steel members 10A and 10B are deformed and the swing arm 9 swings to the right as shown in FIG. 5B, the space between the upper ends of the right U-shaped steel member 11 is reduced and the left U Each U-shaped steel material 10A, 10B is deformed so that the upper end of the shaped steel material 10 is widened. Seismic force in the lateral direction applied to the rectangular frame structure 1 is absorbed by the deformation of the U-shaped steel materials 10A and 10B, that is, the opening and closing plastic deformation of the central curved portions of the U-shaped steel materials 10A and 10B. The same vibration damping effect as when a conventionally known hydraulic damper is used as the steel material can be expected.

  As shown in FIG. 6A, the U-shaped steel materials 10A and 10B use the same U-shaped steel material 11 made of a steel material (such as SN400B) of a solid constant thickness (for example, 9 mm), and its shape Consists of a central bending portion 11a and a pair of straight portions 11b connected to both ends of the bending portion 11a, and the pair of straight portions 11b are formed in a shape in which the width gradually increases as the distance from the bending portion 11a increases. The U-shaped steel material 11 has an interval between the shaft holes 11c at both ends, the free end of the swinging arm 9 standing upright before the occurrence of the swing, and the U-shaped steel material mounting fixed on the rectangular frame structure 1 side. The steel plate is cut into a substantially U shape that matches the position, that is, the distance between the bolt and nut 14a. The important point in this U-shaped steel material 11 is that when an external force is applied in the direction of compressing or pulling away between both ends (the positions of the shaft holes 11c of the pair of linear portions 11b), the curved portion 11a is deformed. The deformation must be plastic deformation, and the plastic deformation area must be large. For example, if the pair of straight portions 11b are V-shaped with a curved portion having a small curvature, stress concentrates on the curved portion having a small curvature and breaks in a short time. The curved portion 11a is curved with a large curvature such that the curved portion 11a is plastically deformed by opening / closing movement of the pair of straight portions 11b.

  From the above points, as the U-shaped steel material 11 used for the U-shaped steel materials 10A and 10B, in addition to the shape shown in FIG. 6A, as shown in FIG. 6B, a central straight portion 11d and both ends of the central straight portion 11d are provided. As shown in FIG. 6C, a U-shaped steel material 11 having a substantially trapezoidal shape composed of a pair of continuous straight portions 11e, wherein the pair of straight portions 11e are formed wider than the central straight portion 11d. A U-shaped steel member 11 having a shape in which a short central straight portion 11d and a pair of straight portions 11b are connected by a curved connecting portion 11f having a small curvature, or a central waveform in which two curved portions are connected in a W shape as shown in FIG. 6D. A U-shaped steel material 11 provided with a portion 11g between a pair of straight portions 11b can be used.

  In the above embodiment, a pair of left and right vertical members on both sides of the upper and lower ends of the rectangular frame structure 1 on the side opposite to the side where the damping device 6 is incorporated, in the embodiment, on the lower end side in the rectangular frame structure 1. The angle between the lower horizontal member 2 and the vertical members 4, 5 is regulated at the corner between the lower horizontal member 2 and the vertical members 4, 5 with respect to the lower horizontal member 2. In order to enhance the vibration damping effect, it is desirable to fix the reinforcing corner metal 35 that suppresses the lateral shaking of the right and left sides with a coach screw or the like. In the illustrated example, the reinforcing metal fitting 35 is fixed to the inner corners of the vertical members 4 and 5, but the outer corners of the vertical members 4 and 5 may be used, or both the inner and outer corners may be included. The reinforcing corner metal 35 may be fixed to the portion.

The configuration of the above embodiment is merely an example, and the present invention is not limited to the configuration of the above embodiment. For example, in the configurations of the embodiments described above, a structure using long hole 32 at the lower swing fulcrum and the support shaft (bolt and nut) 33 of the swing arm 9, the support shaft in the middle fulcrum of the swinging arm 9 The structure using only the (bolt nut) 31 can be replaced with each other, and in any case, the long hole 32 can be provided on the second member 8 (or first member 7) side. Further, an intermediate swing fulcrum (support shaft (bolt nut) 31) of the swing arm 9 is provided on the second member 8 installed between the pair of left and right vertical members 4 and 5, and the intermediate swing fulcrum (support The swing arm 9 extends from the position of the shaft (bolt nut) 31) toward the side where the mounting body 16 of the second member 8 is located, and is U-shaped. The steel materials 10 </ b> A and 10 </ b> B can be interposed between the free end of the swing arm 9 and the second member 8.

  The vibration damping device of the present invention can be easily incorporated into a rectangular frame structure adopted for a wall of a wooden building and the like, and the vibration damping of a wooden building that can surely obtain the desired vibration damping effect. Can be used as a device.

1 Rectangular frame structure 2 Lower horizontal member (base, etc.)
3 Upper horizontal member (beam material)
4,5 Vertical member (column material)
6 Damping device 7 First member 8 Second member 9 Swing arm 10A, 10B U-shaped steel material 11 U-shaped steel material 11a Central curved portion 11b, 11e A pair of linear portions 11c Shaft hole 11d Central linear portion 11f Curved connecting portion 11g Center Corrugated part 12, 16 Mounting body 13, 17 L-shaped member 14a, 14b, 20a, 20b, 25, 26, 34 Bolt nut 15, 21 Spacer 18, 19 Mounting member 22 First mounting part 23 Second mounting part 24, 32 Long hole 27, 31, 33 Support shaft (bolt nut)
28 Lower position spacer of the swing arm 29 Intermediate position spacer of the swing arm 30 Upper position spacer of the swing arm 35 Reinforcing corner metal

Claims (4)

When a rectangular frame structure of a wooden building is swayed in the lateral direction, it is driven laterally around the support shaft in conjunction with the change in angle between the horizontal and vertical members that form the rectangular frame structure. Between the fixed position on the side of the rectangular frame structure where the distance between the swing arm and the swing end of the swing arm changes by the swing of the swing arm and the free end of the swing arm, In the vibration damping device comprising a buffer means for suppressing the swing of the swing arm,
Triangular first member attached to the horizontal member and a pair of left and right vertical members, and the first member is a triangular shape that is upside down and the tops are adjacent to each other in the vertical direction. A second member is provided, and the swing arm is in the shape of a rod that is long in the vertical direction, and one end and an intermediate position of the swing arm are on the top portions adjacent to each other in the vertical direction of the first member and the second member. The two pivot shafts are pivotally supported by the pivot shaft, and one of the two pivot shafts is formed as a vertically elongated hole. Each of the two U-shaped steel members is fixed to the free end of the swing arm with a common shaft, and both ends of the two U-shaped steel members sandwich the swing arm from the front and rear. The other of the first member and the second member is the rocking member. The U-shaped steel members are attached to the U-shaped steel member by being fixed to the left and right fixed positions of the member on the side supporting the intermediate position of the arm. Arranged so that the center part is symmetrical with respect to the swinging arm in the direction where the central part is located on the side of the support shaft that supports the intermediate position of the swinging arm with respect to both ends of the steel material. is, the vibration damping device of the wooden building.   The U-shaped steel material is configured by cutting a steel plate into a substantially U-shape in which an interval between both ends coincides with an interval between the free end of the swing arm and the fixed position before occurrence of swing. Item 1. A vibration control device for a wooden building according to item 1.   The U-shaped steel material includes a central curved portion and a pair of straight portions connected to both ends of the curved portion, and the pair of straight portions is formed in a shape in which the width gradually increases as the distance from the curved portion increases. A vibration control device for wooden buildings as described in 1.   The U-shaped steel material has a substantially trapezoidal shape composed of a central straight line portion and a pair of straight line portions connected to both ends of the central straight line portion, and the pair of straight line portions is formed wider than the central straight line portion. The vibration control device for a wooden building according to claim 2.

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