Vibration control device for brace and brace

Abstract

To provide a vibration control device for a brace which easily maintains performance to absorb vibrations caused by earthquakes or the like.SOLUTION: A vibration control device 1 for a brace is provided for a brace 5 and absorbs vibrational energy added to the brace 5 in a tension direction and a compressing direction. The vibration control device 1 for a brace includes: a lamination part 2 in which each one end side of a first plate material 21 and a second plate material 22 are laminated alternately, and long holes 23 long in a longitudinal direction of the brace 5 formed at the one end side are overlapped with each other; a pressing-engaging part 3 which goes through the long holes 23 of the lamination part 2 in a plate thickness direction of the plate materials 21, 22, presses the lamination part 2 in the plate thickness direction, and integrates the lamination part 2; a first connection part 41 which is positioned on the other end side of the first plate material 21 and connects one of brace parts 51; and a second connection part 42 which is positioned on the other end side of the second plate material 22 and connects the other brace part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vibration damping device for a brace that is attached to a brace attached to a building, and to the brace. [Background technology]

[0002] Conventionally, braces used in buildings are known to absorb earthquake energy by elastically deforming in response to inter-story deformation that occurs in the building due to an earthquake.

[0003] Patent Document 1 also discloses a bolt-direct pressure-applied rubber vibration damper that can ensure the strong pressure required to generate a large frictional force. This rubber vibration damper includes an upper core and a lower core. Both the upper and lower cores are provided with tension brace connection holes, and rubber plates are provided on both sides of the upper and lower cores, with cover plates provided on the outside of each rubber plate. The upper and lower cores and rubber plates are each provided with a plurality of elongated bolt holes, and the cover plate is provided with a plurality of round bolt holes that match the elongated bolt holes, and the elongated bolt holes and round bolt holes are connected with bolts. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6944609 Summary of the Invention [Problem to be solved by the invention]

[0005] However, braces that absorb seismic energy by elastically deforming may undergo plastic deformation before the story drift angle reaches 1 / 200 in the event of a major earthquake. Also, the technology disclosed in Patent Document 1 has a structure in which rubber plates are interposed between the upper core material or lower core material and the cover plate, and vibrations caused by earthquakes and other events may cause the rubber plates to rub against the cover plate, etc., resulting in a risk of performance degradation.

[0006] An object of the present invention is to provide a vibration damping device for a brace and a brace that can easily and stably maintain the ability to absorb vibrations caused by earthquakes and the like. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, the vibration damping device for a brace of the present invention is a vibration damping device for a brace that is attached to a brace and absorbs vibration energy in the tensile direction and the compressive direction applied to the brace, and a stacked portion in which a plurality of first metal plate materials and a plurality of second metal plate materials are alternately stacked at one end sides of each of the first metal plate materials and the brace has elongated holes formed at the one end sides that are long in the longitudinal direction thereof, the elongated holes being overlapped with each other; a pressing engagement portion including a rod-shaped member that passes through the long hole of the laminated portion and an engagement member that engages with the rod-shaped member to press the laminated portion in the lamination direction of the plate materials; a lubricating coating interposed between the first plate and the second plate; a first connecting portion located on the other end side of the plurality of first plate materials and to which one brace portion extending from one body portion located on the longitudinal direction of the brace is connected; a second connecting portion located on the other end side of the plurality of second plate members and connecting the other brace portion extending from the other body portion located on the longitudinal direction of the brace; The present invention is characterized by comprising:

[0008] With the above configuration, when an earthquake occurs that does not exceed the friction limit between the first metal plate members and the second metal plate members in the pressure engagement portion, the tensile and compressive strength of the metal between the first metal plate members and the second metal plate members can suppress building deformation. Furthermore, when an earthquake occurs that exceeds the friction limit, frictional sliding occurs between the first metal plate members and the second metal plate members, maximizing the length of the slot, allowing the earthquake force to be absorbed without plastic deformation of the metal. Because the earthquake force is absorbed by frictional sliding between the first metal plate members and the second metal plate members, this vibration absorption performance can be easily maintained over a long period of time compared to mechanisms that absorb earthquake energy through plastic deformation. Furthermore, the presence of a lubricating coating between the first metal plate members and the second metal plate members ensures stable frictional sliding between the first metal plate members and the second metal plate members, allowing for stable absorption of earthquake force.

[0009] The lubricating coating may be a solid lubricating coating, which allows stable frictional sliding between the first plate and the second plate over a long period of time, thereby enabling stable absorption of seismic forces over a long period of time.

[0010] The pressure engagement portion may include a headed bolt as the rod-shaped member and a nut as the engagement member that screws onto the tip thread of the bolt. In this way, the pressure engagement portion has a pressure structure that is fastened using an existing bolt and nut, and the performance of the vibration damping device for a brace can be accurately set.

[0011] A presser plate having an area larger than that of the head of the bolt and the nut may be provided between the head of the bolt and the plate located on one side of the stacked plate in the stacking direction of the plate materials of the stacked portion, and between the nut and the plate located on the other side of the stacked plate in the stacking direction of the plate materials of the stacked portion, respectively. This allows the pressing engagement portion to press evenly over a large area.

[0012] A washer may be provided on at least one of the head side and the nut side of the bolt, so that even if the gap between the first and second plates changes due to the loss or wear of the lubricating coating, the washer can continue to press the laminated portion in the stacking direction with a substantially constant force.

[0013] The first and second connecting portions may be through holes formed in the first and second plates, which facilitates the manufacture of the first and second plates.

[0014] In addition, the brace of this invention is The vibration damping device for a brace; One brace portion extending from the one body portion is connected to the first connecting portion of the vibration damping device for a brace; Another brace portion extending from the other body portion connected to the second connecting portion of the vibration damping device for a brace; The present invention is characterized by comprising:

[0015] In addition, the brace of this invention is a vibration damping device for a brace, wherein the first connecting portion and the second connecting portion are the through holes; Two opposing engaging portions that engage with both ends of the rod-shaped material inserted into the through-hole, which is the first connecting portion of the vibration damping device for a brace; a connecting portion that connects the two engaging portions; and one brace portion that is fixed to the connecting portion and extends from one of the body portions. two opposing engaging portions that engage with both ends of the rod-shaped material inserted into the through-hole, which is the second connecting portion of the vibration damping device for a brace; a connecting portion that connects the two engaging portions; and the other brace portion that is fixed to the connecting portion and extends from the other body portion. The present invention is characterized by comprising:

[0016] The rod-shaped member may be a bolt with a head, and a nut may be screwed onto the tip of the threaded portion of the bolt. [Effects of the Invention]

[0017] The present invention provides various advantages, such as stable frictional sliding between a plurality of plate materials and the ability to absorb earthquake forces without plastic deformation of the metal. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is an explanatory diagram showing a brace of an embodiment attached to the skeleton of a building. [Figure 2] 2A and 2B are diagrams showing a vibration damping device for a brace provided in the brace shown in FIG. 1, in which FIG. 2A is a front view and FIG. 2B is a plan view. [Figure 3] 1A, 1B, 1C, and 1D are diagrams showing components of the vibration damping device for a brace shown in FIG. [Figure 4] Figures (A) and (B) are graphs showing the measured values ​​of the longitudinal displacement (mm) of the vibration damping device for braces shown in Figure 2, measured by applying tensile and compressive forces (test forces) using an Autograph (product name, manufactured by Shimadzu Corporation). DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. Fig. 1 shows a brace 5 of an embodiment attached to a building skeleton 8. The brace 5 has a vibration damping device for a brace 1 of the embodiment, one brace portion 51 extending from the vibration damping device for a brace 1 to an upper portion of the skeleton 8, and the other brace portion 52 extending from the vibration damping device for a brace 1 to a lower portion of the skeleton 8.

[0020] One brace portion 51 is connected to a connecting portion 4 (first connecting portion 41) on one side of the vibration damping device for braces 1, and the other brace portion 52 is connected to a connecting portion 4 (second connecting portion 42) on the other side of the vibration damping device for braces 1. The vibration damping device for braces 1 is attached to the middle position of the brace 5, and absorbs vibration energy in the tensile and compressive directions applied to the brace 5.

[0021] As shown in Figures 2(A) and 2(B), the vibration damping device for braces 1 comprises a laminated section 2, a pressure engagement section 3, and the above-mentioned connecting section 4. The components that make up the laminated section 2, pressure engagement section 3, etc. are shown in Figures 3(A), 3(B), 3(C), and 3(D).

[0022] The stacked portion 2 is formed by, for example, six first metal (steel, etc.) plate members 21 and six second metal (steel, etc.) plate members 22, each of which is stacked alternately at one end thereof, and the elongated holes 23 formed at the one end thereof and elongated in the longitudinal direction of the brace 5 are overlapped with each other.

[0023] The first plate material 21 and the second plate material 22 have a rectangular shape (e.g., long side length 230 mm, short side length 70 mm) that is elongated in the longitudinal direction of the brace 5, and a plate thickness of, for example, 4.5 mm. Two elongated holes 23 are formed with a gap in the short side direction of the rectangular shape, and these are positioned parallel to each other. The length of the elongated holes 23 (the bolt relative movement length), as described below, is, for example, 70 mm. The first plate material 21 and the second plate material 22 are produced, for example, by pressing a metal plate.

[0024] A solid lubricating coating F that generates a predetermined coefficient of friction is formed on one or both surfaces of each of the first plate 21 and the second plate 22, thereby interposing the solid lubricating coating F between the first plate 21 and the second plate 22. This solid lubricating coating F is made of a film (e.g., 15 μm or less) of MoS2 (molybdenum disulfide), graphite, PTFE (polytetrafluoroethylene), or the like. The solid lubricating coating F is formed over the entire surface or a portion of the first plate 21 (second plate 22) (e.g., the maximum overlapping area of ​​the adjacent plates 21, 22). Note that instead of the solid lubricating coating F, a lubricating coating made of grease, for example, a blend of lithium grease and molybdenum disulfide, can be used; however, in terms of long-term stability, a solid lubricating coating is preferable.

[0025] The pressing engagement portion 3 is provided with a headed bolt 31 (rod-shaped member) that passes through the long hole 23 of the stacking portion 2 in the stacking direction of the first plate material 21 and the second plate material 22, and a nut 32 (engagement member) that engages with the tip screw portion of the bolt 31 and presses the stacking portion 2 in the stacking direction of the plate materials 21, 22, thereby integrating the stacking portion 2.

[0026] The rigidity and strength of a building can be designed by setting the pressing force of the pressure engaging portion 3 on the stacked portion 2 and the overlapping area and number of the first plate material 21 and the second plate material 22. Increasing the number of plates contributes to improving the rigidity of the building, while increasing the pressing force of the pressure engaging portion 3 (the tightening axial force of the bolts 31) contributes to improving the strength and bearing capacity of the building. In this embodiment, the overlapping area and number of the first plate material 21 and the second plate material 22 and the pressing force of the pressure engaging portion 3 are set so that, for example, slippage does not occur in the stacked portion 2 at seismic intensity levels of 6 or less, but occurs in the stacked portion 2 at seismic intensity levels above 6. The initial sliding resistance of the stacked portion 2 can also be considered the design strength of the building. The length of the slot 23 is set so that the pressure engaging portion 3 does not hit the end of the slot 23 even if an inter-story deformation of 1 / 200 occurs in the building. In this example, the length is approximately 70 mm.

[0027] Furthermore, washer 31a is fitted onto the shank of bolt 31 on the head side of bolt 31, and washer 32a is fitted onto the shank of bolt 31 on the nut 32 side. Washer 31a and washer 32a may be provided integrally with bolt 31 and nut 32, or may be spring washers or disc washers attached separately. Furthermore, the structure is not limited to one including both washer 31a and washer 32a, and one including either one may also be used.

[0028] Further, presser plates 35 having an area larger than that of the head of the bolt 31 and the nut 32 are provided between the head of the bolt 31 and the second plate 22 located on one side in the stacking direction of the plate materials 21, 22 of the stacked section 2, and between the nut 32 and the first plate 21 located on the other side in the stacking direction of the plate materials 21, 22 of the stacked section 2, and the bolt 31 passes through an insertion hole formed in this presser plate 35. Each presser plate 35 suppresses the concentrated load on the stacked section 2 by the bolt 31, and has a size of, for example, short sides of 35 mm and long sides of 100 mm, and a plate thickness of, for example, 6 mm.

[0029] Furthermore, for example, the first connecting portion 41 and the second connecting portion 42 are bolt mounting portions consisting of circular through holes formed in the plate thickness direction of the first plate material 21 and the second plate material 22 of the laminated portion 2, and bolt 53A, which is a circular rod-shaped material, is inserted into this bolt mounting portion. A nut 53B is screwed onto the tip thread portion of the inserted bolt 53A.

[0030] The brace portion 51 and the brace portion 52 of the brace 5 are connected to the first connecting portion 41 and the second connecting portion 42 of the vibration damping device for a brace 1 via channel steel members 54, respectively.

[0031] One channel steel member 54 has two opposing engaging portions 54a and 54b that engage with both ends of bolt 53A inserted into the bolt mounting portion, which is first connecting portion 41, and a connecting portion 54c that connects the two engaging portions 54a and 54b. The end of brace portion 51 is fixed to connecting portion 54c by, for example, welding.

[0032] Similarly, the other channel steel member 54 has two opposing engaging portions 54a and 54b that engage with both ends of the bolt 53A inserted into the bolt mounting portion, which is the second connecting portion 42, and a connecting portion 54c that connects the two engaging portions 54a and 54b. The end of the brace portion 52 is fixed to the connecting portion 54c by, for example, welding.

[0033] With the above configuration, when an earthquake occurs that does not exceed the friction limit between the plurality of first metal plates 21 and the plurality of second metal plates 22, the tensile and compressive strength of the metal of the first plate 21 and the second plate 22 can suppress deformation of the building. When an earthquake occurs that exceeds the friction limit, frictional sliding occurs between the first plate 21 and the second plate 22, maximizing the length of the slot 23, allowing the earthquake force to be absorbed without plastic deformation of the metal. Because the earthquake force is absorbed by the frictional sliding that occurs between the first plate 21 and the second plate 22 in this way, it is easier to maintain this vibration absorption performance over a long period of time compared to mechanisms that absorb earthquake energy through plastic deformation.

[0034] Furthermore, since a solid lubricating coating F that generates a predetermined friction coefficient is interposed between the first plate material 21 and the second plate material 22, seizure between the first plate material 21 and the second plate material 22 is prevented and stable frictional sliding (constant friction between the plates) is obtained over the long term, making it possible to absorb earthquake forces stably over the long term.

[0035] For example, if M12 bolts are used as the bolts 31 and two bolts 31 are tightened to a torque of approximately 2 N·m, the torque will be 1 kN / cm 2 If two screws are tightened to about 10 N·m, the sliding resistance is 5 kN / cm 2 A sliding resistance of about 5 kN / cm is obtained. Friction points on 11 surfaces are formed between the 12 first plate materials 21 and the 12 second plate materials 22 in the laminated portion 2. 2 11 times that is 55kN / cm 2 The initial sliding resistance is increased by 20% to 66kN / cm 2 (Actual measurement).

[0036] The following shows the experimental results when MoS2 (molybdenum disulfide) was used as the solid lubricant coating F. Figure 4(A) is a graph showing the measured displacement (mm) of the vibration damping device for braces 1 when tension and compression forces (test forces) were applied to the vibration damping device for braces 1 using an Autograph (product name) tester. The two bolts 31 in the vibration damping device for braces 1 were M12 bolts, tightened to a torque of approximately 2 N·m. As can be seen from this graph, a load (sliding resistance) of approximately 1 kN was generated. Figure 4(B) shows the test results when the two bolts 31 in the vibration damping device for braces 1 were M12 bolts, tightened to a torque of approximately 5 N·m. Under this 5 N·m tightening condition, a load (sliding resistance) of 2 kN was generated, approximately double that under the 2 N·m tightening condition. In both cases, the load and displacement are balanced for the first 20 or so revolutions, but after about 30 revolutions, the load and displacement tend to gradually increase. In both cases, the strength tends to increase slightly, which is considered appropriate for coping with earthquake forces. Experiments were also conducted without using a lubricating coating, but the results showed that the test force values ​​fluctuated greatly and the frictional sliding was not stable.

[0037] Furthermore, the pressure engagement portion 3 is provided with a bolt 31 that passes through the long hole 23 and a nut 32 that is screwed onto the tip screw portion of this bolt 31, so that the pressure engagement portion 3 has a pressure structure that is fastened using an existing bolt and nut, and the performance of the vibration control device for braces 1 can be set accurately.

[0038] By providing the press engagement portion 3 with the washers 31a and 32a, even if the gap between the first plate material 21 and the second plate material 22 changes due to the solid lubricating coating F falling off or wearing away, the washers 31a and 32a can continue to press the stack portion 2 in the stacking direction with a substantially constant force.

[0039] In addition, in this embodiment, the press plate 35 is provided, so that the pressing engagement portion 3 can press evenly over a large area.

[0040] Furthermore, since the first connecting portion 41 and the second connecting portion 42 are through holes into which rod-shaped members are inserted, the structure can be simplified.

[0041] Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiments within the same scope as the present invention or within an equivalent scope. [Explanation of symbols]

[0042] 1: Vibration control device for braces 2: Laminated section 3: Press engagement part 4:Connection part 5: Brace 6: Seismic intensity 8: Body part 21: First board 22: Second board 23: Long hole 31: Bolt 31a: Washer 32: Nut 32a: Washer 35: Retaining plate 41: 1st connection part 42:Second connection part 51: Brace part 52: Brace part 53A: Bolt 53B: Nut 54: Channel steel member 54a: Engagement part 54c: Joint F: Solid lubricating film

Claims

1. A vibration damping device for a brace that is attached to a brace and absorbs vibration energy in the tensile and compressive directions applied to the brace, a stacked portion in which a plurality of first metal plate members and a plurality of second metal plate members are alternately stacked at one end sides of each of the first metal plate members and the second metal plate members, and long holes that are long in the longitudinal direction of the brace and are formed at the one end sides overlap each other; a pressing engagement portion including a rod-shaped member that passes through the long hole of the laminated portion and an engagement member that engages with the rod-shaped member to press the laminated portion in the lamination direction of the plate materials; a lubricating coating interposed between the first plate and the second plate; a first connecting portion located on the other end side of the plurality of first plate members and to which one brace portion extending from one body portion located on the longitudinal direction of the brace is connected; a second connecting portion located on the other end side of the plurality of second plate members and to which the other brace portion extending from the other body portion located on the longitudinal direction of the brace is connected; A vibration damping device for a brace, comprising:

2. 2. The vibration damping device for a brace according to claim 1, wherein the lubricating coating is a solid lubricating coating.

3. In the vibration damping device for a brace described in claim 1, the pressing engagement portion comprises a headed bolt which is the rod-shaped member and a nut which is the engagement member that screws into the tip thread portion of the bolt.

4. 4. The vibration damping device for a brace according to claim 3, characterized in that a pressure plate having an area larger than the head of the bolt and the nut is provided between the head of the bolt and the plate material located on one side of the stacking direction of the plate material in the stacked section, and between the nut and the plate material located on the other side of the stacking direction of the plate material in the stacked section.

5. 5. The vibration damping device for a brace according to claim 3, wherein a washer is provided on at least one of the head side and the nut side of the bolt.

6. 2. The vibration damping device for a brace according to claim 1, wherein the first connecting portion and the second connecting portion are through holes formed in the first plate material and the second plate material.

7. The vibration damping device for a brace according to claim 1; one brace portion extending from the one body portion and connected to the first connecting portion of the vibration damping device for a brace; Another brace portion extending from the other body portion connected to the second connecting portion of the vibration damping device for a brace; A brace comprising:

8. The vibration damping device for a brace according to claim 6; two opposing engaging portions that engage with both ends of the rod-shaped material inserted into the through-hole, which is the first connecting portion of the vibration damping device for a brace; a connecting portion that connects the two engaging portions; and one brace portion that is fixed to the connecting portion and extends from one of the body portions. two opposing engaging portions that engage with both ends of the rod-shaped material inserted into the through-hole, which is the second connecting portion of the vibration damping device for a brace; a connecting portion that connects the two engaging portions; and a second brace portion that is fixed to the connecting portion and extends from the second body portion. A brace comprising:

9. 9. The brace according to claim 8, wherein the rod-shaped member is a headed bolt, and a nut is screwed onto the tip of the threaded portion of the bolt.

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