JP5076875B2 - Friction damper - Google Patents

Description

  The present invention relates to a friction damper that suppresses vibration of a building frame.

  Friction dampers that attenuate the vibration of building frames are known. The friction damper is disposed between a pair of steel members that move relative to each other in a predetermined direction in the building frame, and suppresses the relative movement by the frictional force between the pressure plates that slide with the relative movement. is there.

FIG. 1 is an explanatory view of the friction damper 10d, and FIG. 2A is a sectional view taken along line II-II in FIG. In this example, the friction damper 10 d is provided on a web of H-section steel that constitutes the brace 5 of the column beam frame 1. That is, as shown in FIG. 2A, the friction damper 10d includes a first pressure contact plate 11 bolted to the web 51W of one brace segment 51 obtained by dividing the brace 5 into two parts, and the other brace part. A second press-contact plate 21 in which the web 52W of the piece 52 is used as it is, and a third press-contact plate 31 that sandwiches the first press-contact plate 11 from both sides with a predetermined press-contact force by the second press-contact plate 21. ing. The pressure contact force is provided through the first through hole 13 of the first pressure contact plate 11, the second through hole 23 of the second pressure contact plate 21, and the third through hole 33 of the third pressure contact plate 31. The nut 41n is screwed and fastened to the bolt 41b, and is provided between the head of the bolt 41b and the second press contact plate 21 in order to stabilize the press contact force, and A disc spring 43 is interposed between the nut 41 n and the third press-contact plate 31. Further, the first through hole 13 is formed as a long hole that is long in the predetermined direction, whereby the second press-contacting plate according to the relative movement between the one brace piece 51 and the other brace piece 52. 21 and the third press contact plate 31 are configured to be slidable in the predetermined direction with respect to the first press contact plate 11, and as a result, the relative movement is suppressed by the frictional force Ff at the time of the slide, and the column beam frame 1. Is damped (see Patent Document 1).
JP 2000-352113 A

  By the way, conventionally, as shown in FIG. 2A, the second press contact plate 21 and the third press contact plate 31 provided in the other brace segment 52 have separate fastening portions 55 in addition to the bolts 41b and nuts 41n. The fastening portion 55 is integrally connected and fixed so as not to move relative to each other. As a result, an external force P from the other brace segment 52 (second press contact plate 21) is applied to the third press contact plate 31 via the fastening portion 55, thereby causing the third press contact plate 31 to The first press contact plate 11 is slid in conjunction with the press contact plate 21.

  Here, the reason why such a fastening portion 55 is provided is not to apply a shearing force Fs as shown in FIG. 2 to the bolt 41b, and only a bolt axial force is applied to the bolt 41b. It was because it was made. In other words, this is because the bolt 41 b does not transmit the force in the predetermined direction between the second pressure contact plate 21 and the third pressure contact plate 31.

  However, when such a fastening portion 55 is provided, not only the number of parts of the friction damper 10 is increased, but also a region for arranging the fastening portion 55 must be secured with respect to the third pressure contact plate 31. The size reduction of the pressure contact plate 31 is also prevented. As a result, cost reduction and downsizing of the friction damper 10 are hindered.

  The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a friction damper capable of reducing the cost and reducing the size.

In order to achieve this object, the friction damper shown in claim 1 is:
A friction damper that is disposed between a pair of members that move relative to each other in a predetermined direction in a building frame, and that suppresses the relative movement by a frictional force between pressure-contact plates that slide with the relative movement,
A first pressure contact plate provided on one member of the pair of members;
A second pressure contact plate provided on the other member of the pair of members;
A third pressure contact plate that sandwiches the first pressure contact plate from both sides with a predetermined pressure contact force with the second pressure contact plate;
In order to apply the pressure contact force, the first pressure contact plate is inserted through the first through hole long in the predetermined direction, the second pressure contact plate second through hole, and the third pressure contact plate third through hole. A bolt member provided;
A pipe member that is provided through the first through hole, the second through hole, and the third through hole while inserting the bolt member inside,
The first through hole allows sliding of the second pressing plate relative to the first pressing plate in the predetermined direction, and the third pressing plate is moved relative to the first pressing plate in conjunction with the sliding. The sliding force is applied from the second pressure contact plate through the engagement with the second through hole and the third through hole of the pipe member so as to slide in the predetermined direction. It is transmitted to the three pressure contact plates.

  According to the first aspect of the present invention, the force for sliding the third pressure contact plate in conjunction with the second pressure contact plate is the force between the second through hole and the third through hole of the pipe member. It is transmitted from the second press contact plate to the third press contact plate through engagement. Therefore, the fastening portion for fastening and fixing the third pressure contact plate to the second pressure contact plate can be omitted, and the size of the third pressure contact plate can be reduced along with the omission, and as a result, the cost of the friction damper is reduced. In addition, downsizing can be achieved.

  The force for sliding the third pressure contact plate is from the second pressure contact plate to the third pressure contact plate through engagement with the second through hole and the third through hole of the pipe member. Therefore, there is almost no shearing force acting on the bolt member, and the bolt member can be used exclusively for applying a pressing force, and the soundness can be maintained high.

The invention shown in claim 2 is the friction damper according to claim 1,
A gap is formed between the pipe member and the bolt member.
According to the second aspect of the present invention, since the force for sliding the third pressure contact plate is completely prevented from being input to the bolt member, the shearing force acts on the bolt member. Can be surely prevented.

The invention according to claim 3 is the friction damper according to claim 1 or 2,
A sliding plate or a friction plate is fixed to both surfaces of the first pressure contact plate,
In the second press contact plate and the third press contact plate, a friction plate is fixed to a surface of the first press contact plate that faces the sliding plate, while a slide surface of the first press contact plate faces the friction plate. The board is fixed,
The frictional force is generated by sliding between the sliding plate and the friction plate.
According to the third aspect of the present invention, a frictional force can be reliably generated by sliding between the first pressure contact plate, the second pressure contact plate, and the third pressure contact plate.

Invention of Claim 4 is a friction damper in any one of Claims 1 thru | or 3, Comprising:
A nut that is screwed to the tip of the bolt member, and applies the pressure contact force to the first pressure contact plate, the second pressure contact plate, and the third pressure contact plate by the head of the bolt member;
A disc spring is inserted between at least one of the head and the press contact plate adjacent to the head, and between the nut and the press contact plate adjacent to the nut,
The elastic force of the disc spring is applied to the first pressure plate, the second pressure plate, and the third pressure plate as the pressure force.
According to the fourth aspect of the present invention, since the pressing force is applied by a constant elastic force due to the characteristics of the non-linear region of the disc spring, an error in setting the pressing force and an influence due to wear of the pressing plate are affected. The size of the pressure contact force can be stabilized, for example, it can be reduced.

Invention of Claim 5 is the friction damper in any one of Claims 1 thru | or 4, Comprising:
A plate member having a hole having a diameter smaller than the outer diameter of the pipe member is fixed around the third through hole of the third pressure contact plate so that the hole matches the third through hole. ,
The bolt member is passed through the hole.
According to the fifth aspect of the present invention, the pipe member can effectively prevent the pipe member from falling out of the third through hole.

The invention shown in claim 6 is the friction damper according to any one of claims 1 to 5,
A plate member having a hole portion having a diameter smaller than the outer diameter of the pipe member is fixed around the second through hole of the second pressure contact plate so that the hole portion matches the second through hole. ,
The bolt member is passed through the hole.
According to the sixth aspect of the present invention, the pipe member can be effectively prevented from falling off from the second through hole.

The invention shown in claim 7 is the friction damper according to any one of claims 1 to 6,
The size of the gap between the pipe member in the predetermined direction is smaller in the second through hole and the third through hole than in the first through hole,
The size of the gap between the second through hole and the third through hole is an arbitrary value in the range of 0.1 to 3.0 mm.
According to the seventh aspect of the present invention, the size of the gap between the second through hole and the third through hole is made smaller than the size of the gap between the first through holes, and each is 0. Since it is set to an arbitrary value in the range of 1 to 3.0 mm, the third pressure contact plate is provided while facilitating the insertion work of the pipe member into the second through hole and the third through hole during construction. Transmission of force for sliding can be reliably performed from the second pressure contact plate to the third pressure contact plate.

  According to the friction damper according to the present invention, it is possible to reduce the cost and the size of the friction damper.

=== Friction Damper 10 of First Embodiment ===
FIG. 3A is an explanatory view of the friction damper 10 of the first embodiment applied to the brace 5 of the column beam structure 1 of the building, and is a cross-sectional view corresponding to the II-II arrow in FIG. 1. FIG. 3B is an enlarged view of FIG. 3A. 4A, FIG. 4B, FIG. 4C, and FIG. 4D are respectively an AA arrow view, a BB arrow view, a CC arrow view, and a DD arrow view in FIG. 3A. is there.

  Similar to the example of FIG. 1 described above, the friction damper 10 of the first embodiment is also incorporated in the brace 5 of the column beam frame 1. That is, the brace 5 in which the friction damper 10 is incorporated is also divided at an appropriate position so as to be spaced from each other by a distance S1, thereby forming a pair of brace segments 51 and 52 (corresponding to a pair of members) as shown in FIG. 3A. Thus, the brace segment 51, 52 can be moved relative to each other in the bridging direction of the brace 5 (corresponding to a predetermined direction, hereinafter also referred to as the brace bridging direction) by the interval S1. Yes. In the friction damper 10, the first pressure contact plate 11 bolted to the web 51 </ b> W of one brace segment 51 via the filler plate 53 and the web 52 </ b> W of the other brace segment 52 are used as they are. The pressure contact plate 21 and the second pressure contact plate 21 have a third pressure contact plate 31 that sandwiches the first pressure contact plate 11 from the front and back surfaces with a predetermined pressure contact force in the plate thickness direction.

Here, a stainless plate as an example of the sliding plate 15 is fixed to the front and back surfaces of the first pressing plate 11 so as not to move, while the second pressing plate 21 facing the sliding plates 15 and 15, and Friction plates 25 and 35 are fixed to each surface of the third pressure contact plate 31 so as not to move. As the fixing method, for example, (1) a method by adhesion, (2) surface roughness increasing treatment for each surface constituting the fixing surface (first pressing plate 11, second pressing plate 21, third pressing) Plate 31, sliding plate 15 and friction plates 25, 35 with rough surfaces, shot blasting, etc.) to prevent relative slippage on the fixed surface, and (3) fitting method. It is done.

  On the other hand, a first through hole 13, a second through hole 23, and a third through hole 33 are formed through the first press plate 11, the second press plate 21, and the third press plate 31, respectively, in the thickness direction. In addition, a steel round pipe 47 (a pipe having a circular cross section and corresponding to a pipe member) is passed through these through holes 13, 23, and 33 in a skewered manner. A high-strength bolt 41b (corresponding to a bolt member) is passed along the tube axis direction. And the nut 41n is screwed by the front-end | tip part of this high strength volt | bolt 41b, The 1st press contact plate 11 is the 2nd press contact plate 21, the 3rd press contact plate 31, and these high strength bolt 41b and the nut 41n. Thus, the pressure contact force for pinching is applied in the plate thickness direction.

  Therefore, by this pressure contact force, the friction plate 25 of the second pressure contact plate 21 and the friction plate 35 of the third pressure contact plate 31 are brought into contact with the sliding plate 15 of the first pressure contact plate 11, and the pressure contact force is applied during sliding. A corresponding friction force Ff is generated (see FIG. 3B). The frictional force Ff becomes a damping force for vibration of the column beam frame 1. A disc spring 43 is interposed between the head of the high-strength bolt 41 b and the second press-contact plate 21 and between the nut 41 n and the third press-contact plate 31. The magnitude of the pressure contact force is stabilized by the generated force.

  By the way, in order to allow the above-mentioned sliding in the brace bridging direction, the first through hole 13 of the first press contact plate 11 is formed as a long long hole along the brace bridging direction (FIG. 4C). See also). That is, the second press contact plate 21 and the third press contact plate 31 with respect to the first press contact plate 11 due to the relative movement of the brace segments 51 and 52 of the column beam frame 1 in the brace extending direction by the long holes 13. However, it is slidable in the brace bridging direction.

  On the other hand, the second through hole 23 of the second press contact plate 21 and the third through hole 33 of the third press contact plate 31 are formed between the round pipe 47 and the clearance S2 in the brace extending direction. Is smaller than that in the case of the first through-hole 13, and is set to a perfect circle having a hole diameter such that the gap S2 is as small as possible (see FIG. 3B).

  The reason for this is that in the present invention, the second pressure contact plate 21 slides with respect to the first pressure contact plate 11 through the contact engagement between the round pipe 47 and the second through hole 23 and the third through hole 33. This is because the third pressure contact plate 31 is made to slide in conjunction with the above.

  Specifically, when the column beam frame 1 vibrates, as shown in FIG. 3B, in the second press-contact plate 21 as the other brace divided piece 52, the external force P accompanying the vibration is directly applied from the column beam frame 1. As a result, the second pressure contact plate 21 slides with respect to the first pressure contact plate 11, and the friction force Ff is generated by this sliding to be the damping force of the vibration. In this case, it is not directly connected to the other brace divided piece 52, and therefore, it is necessary to apply a force required for sliding from the second pressure contact plate 21 through the round pipe 47. .

  That is, as shown in FIG. 3B, the partial force of the external force P acting on the second pressure contact plate 21 is a support pressure Fp due to contact engagement between the round pipe 47 and the inner peripheral surface of the second through hole 23. Is transmitted from the second pressure contact plate 21 to the round pipe 47, and the support pressure Fp transmitted to the round pipe 47 undergoes a form of a shearing force Fs in the round pipe 47, and then the round pipe 47 and the third penetration It is transmitted to the third press contact plate 31 by contact engagement with the inner peripheral surface of the hole 33, and as a result, the third press contact plate 31 slides with respect to the first press contact plate 11 by the transmitted support pressure Fp. To do. Along with this sliding, a frictional force Ff is generated between the third press contact plate 31 and the first press contact plate 11 and contributes to the attenuation of the vibration.

  Therefore, it is desirable that the diameters of the second through hole 23 and the third through hole 33 be as small as possible without causing a problem in passing the round pipe 47 during construction. For example, when the round pipe 47 is inserted, The clearance S2 with the round pipe 47 is preferably in the range of 0.1 to 3.0 mm in the brace extending direction. If it does so, it will become possible to transmit the supporting pressure Fp required for sliding to the 3rd press-contacting plate 31 reliably, making the round pipe passing operation | work at the time of construction easy.

  Incidentally, in the ideal state in which the gap S2 is set to zero, the friction damper 10 exhibits vibration energy absorption history characteristics as shown in FIG. This graph is a graph obtained by forcibly oscillating with a predetermined amplitude δ0 in the brace spanning direction. The horizontal axis represents the relative displacement δ in the brace spanning direction, and the vertical axis represents the friction damper 10. The total sum ΣFf of the frictional forces to be performed is shown.

Here, the frictional force Ff0 in the graph is expressed by the following equation when the friction coefficient between the sliding plate 15 and the friction plates 25 and 35 is μ and the pressure contact force is N.
Ff0 = 2 × μ × N
The numerical value “2” in the above equation is because the friction damper 10 is a two-surface friction friction damper having two sliding surfaces that generate the frictional force Ff. Needless to say, the shearing force Fs, the supporting pressure Fp, the frictional force Ff, and the external force P in FIG. 3B are in the following balanced relationship.
Fs = Fp = Ff
P = 2 × Ff

  By the way, it is desirable to provide a gap between the high-strength bolt 41b and the round pipe 47 as shown in FIG. 3B, and more desirably, the size G of the gap is a limit state assumed in the design (for example, The round pipe 47 in a deformed state up to the elastic limit) may be sized so that the inner peripheral surface of the round pipe 47 and the high-strength bolt 41b do not contact each other. And if it sets in this way, since the supporting pressure Fp for sliding the 3rd press-contacting plate 31 acts only on the round pipe 47, it does not act on the high strength bolt 41b. It becomes possible to maintain a high state.

  Further, desirably, as shown in FIG. 3B, the total length of the round pipe 47 is set to such a length that both ends in the tube axis direction do not protrude outward from the third through hole 33 and the second through hole 23. At the same time, a thin plate 45 (corresponding to a plate member) with a hole 45a is fixed to the surface of the third pressure contact plate 31 on the disc spring 43 side and the surface of the second pressure contact plate 21 on the disc spring 43 side. The hole diameters of the holes 45a and 45a of the thin plates 45 and 45 may be set smaller than the outer diameter of the round pipe 47. In this way, since the round pipe 47 is restricted from moving in the tube axis direction by the thin plates 45, 45, the drop off of the round pipe 47 from the third, second, and first through holes 33, 23, 13 is prevented. It is surely prevented. In addition, if these thin plates 45 and 45 are comprised with a raw material with a low friction coefficient, or coat with the same material, abrasion of the corner | angular part of the disc spring 43 which contact | abuts these thin plates 45 and 45 can be reduced.

=== Friction Damper 10a of Second Embodiment ===
In the first embodiment described above, as shown in FIG. 3A, two sliding surfaces that generate frictional force are obtained by sandwiching the front and back surfaces of the first pressure contact plate 11 between the second pressure contact plate 21 and the third pressure contact plate 31. The two-surface friction friction damper 10 formed is exemplified, but the friction damper 10a of the second embodiment shown in FIG. 6 is different in that it is a four-surface friction friction damper having four sliding surfaces. That is, one first press contact plate 11a is added to be two, and accordingly, one third press contact plate 31a is also added to be two. Here, for convenience of explanation, the first pressure contact plate that is additionally provided is indicated by reference numeral 11a, and the third pressure contact plate that is additionally provided is indicated by reference numeral 31a. The first press contact plate 11 and the third press contact plate 31 of the first embodiment are members having exactly the same specifications.

  The friction damper 10a according to the second embodiment will be described in detail with reference to FIG. 6. First, in the friction damper 10a according to the second embodiment, the web 51W of the brace segment 51 to which the first press contact plate 11 is bolted in the first embodiment is described. The first pressure contact plate 11a is bolted separately not only on one side but also on the opposite surface via the filler plate 53, and this additional first pressure contact plate 11a is connected to the first embodiment of the first embodiment. A third pressure contact plate 31 a is newly provided to be sandwiched between the second pressure contact plates 21. The first through hole 13 is also formed in the elongated hole having the same specification in the first press contact plate 11a that is additionally installed, while the third through hole 33 is also in the same specification in the third press contact plate 31a that is additionally provided. Furthermore, the round pipe 47 passed through the first to third through holes 13, 23, 33 of the first embodiment is inserted into the first and third through holes 13, 33. The high-strength bolt 41b is inserted and fastened by a nut 41n at the tip.

  Therefore, a sliding surface is newly formed between the second pressure contact plate 21 and the additionally provided first pressure contact plate 11a, and the additionally provided first pressure contact plate 11a and the additionally provided third pressure contact plate 11a. A new sliding surface is also formed between the pressure contact plate 31a and the four-surface friction friction damper 10a having two sliding surfaces more than the two-surface friction friction damper 10 of the first embodiment. Has been achieved.

  Incidentally, this additional third pressure contact plate 31 a also applies a support pressure Fp for sliding against the first pressure contact plate 11 a to the round pipe 47, the third through hole 33, and the second through hole 23. Needless to say, it is applied from the second press contact plate 21 through the contact engagement.

  Further, since the friction damper 10a of the second embodiment is a four-surface friction, even under the action of a pressure contact force equivalent to the first embodiment of the two-surface friction described above, it is twice as large as the first embodiment. Therefore, it is possible to output a large frictional force ΣFf for a compact size.

  Further, in the friction damper 10a of the second embodiment, the first press contact plate 11 and the first press contact plate 11a are arranged symmetrically with respect to the second press contact plate 21, and the third press contact plate 31 and the third press contact plate 31a. The pressure contact plate 31 a is also arranged symmetrically with respect to the second pressure contact plate 21. Therefore, the support pressure Fp can be allocated and applied almost evenly from the second pressure contact plate 21 to the third pressure contact plates 31 and 31a, and as a result, the vibration damping function can be stabilized.

  FIGS. 7 and 8 illustrate friction dampers 10b and 10c configured to be 6-surface friction and 8-surface friction, respectively. However, it is clear that the configurations of the friction dampers 10b and 10c can be obtained by the same method as described above, that is, by additionally installing the first press contact plate 11a and the third press contact plate 31a. Detailed description is omitted. In addition, also in the friction dampers 10b and 10c of these 6-surface friction and 8-surface friction, the additionally installed third pressure contact plate 31a has a support pressure Fp for sliding with respect to the first pressure contact plates 11 and 11a. Needless to say, it is applied from the second pressure contact plate 21 through contact engagement between the round pipe 47 and the third through hole 33 and the second through hole 23.

=== Other Embodiments ===
As mentioned above, although embodiment of this invention was described, this invention is not limited to this embodiment, The deformation | transformation as shown below is possible in the range which does not deviate from the summary.

  In the above-described embodiment, the friction damper 10 is incorporated in the web of the brace 5 of the column beam frame 1. However, the invention is not limited to this, and may be incorporated in the flange of the brace 5. You may incorporate in parts other than the brace 5 (for example, a stud, a partition wall, etc.). That is, any pair of members that move relative to each other when the column beam frame 1 of the building vibrates can be installed between them.

  In the above-described embodiment, the steel round pipe 47 is exemplified as an example of the pipe member. However, the steel round pipe 47 has a proof strength that can withstand the assumed shearing force Fs, and the high strength bolt 41b can be inserted inside. If there is, the shape and material are not limited to this. For example, the shape may be a rectangular pipe with a rectangular cross section, and the material may be a non-ferrous metal such as aluminum or a non-metal such as resin.

  In the above-described embodiment, the configuration in which only one round pipe 47 through which the high-strength bolt 41b for applying the pressing force is inserted is illustrated, but the present invention is not limited to this. That is, if the supporting pressure Fp for sliding the third pressure contact plate 31 from the second pressure contact plate 21 to the third pressure contact plate 31 is transmitted only through the round pipe 47, the high-strength bolt A plurality of round pipes 47 through which 41b is inserted may be provided. As an example of installation in that case, arranging a plurality of lines along the brace bridging direction, arranging a plurality of lines along the plate width direction orthogonal to both the brace bridging direction and the plate thickness direction, and the like.

  In the above-described embodiment, the material of the friction plates 25 and 35 has not been described in detail. However, any material that generates an appropriate frictional force with the sliding plate 15 such as a stainless steel plate can be applied. For example, when the sliding plate 15 is a stainless steel plate, the friction plates 25 and 35 include fiber materials such as aramid fiber, glass fiber, vinylon fiber, carbon fiber, cashew dust, lead, etc. with a thermosetting resin as a binder. And a friction material mainly composed of a friction modifier and a filler such as sulfate sulfate. As the friction plates 25 and 35, the above-described friction material may be used alone, or a friction material with a steel plate or the like lined up to increase the strength may be used.

  In the above-described embodiment, the friction dampers 10, 10a, 10b, and 10c having two, four, six, and eight surface frictions are exemplified. However, the number of sliding surfaces is not limited to this, and 2 × n. Needless to say, the surface friction (n is an integer of 5 or more) may be used.

  In the above-described embodiment, the first pressure contact plate 11 is provided with a stainless steel plate as an example of the sliding plate 15, and the second pressure contact plate 21 and the third pressure contact plate 31 are provided with the friction plate 25 and the friction plate 35. However, the arrangement relationship may be reversed.

  In the above-described embodiment, the disc spring 43 is inserted between both the head of the high-strength bolt 41b and the second press contact plate 21 and between the nut 41n and the third press contact plate 31, respectively. You may install only in either.

It is explanatory drawing of the friction damper 10d integrated in the brace 5 of the column beam frame 1. FIG. It is II-II sectional drawing in FIG. It is explanatory drawing of the friction damper 10 of 1st Embodiment. 2 is an enlarged view of the friction damper 10. FIG. 4A, FIG. 4B, FIG. 4C, and FIG. 4D are respectively an AA arrow view, a BB arrow view, a CC arrow view, and a DD arrow view in FIG. 3A. This is a vibration energy absorption history characteristic of the friction damper 10. It is explanatory drawing of the friction damper 10a of 2nd Embodiment. It is explanatory drawing of the friction damper 10b comprised as 6 surface friction as other embodiment. It is explanatory drawing of the friction damper 10c comprised to 8 surface friction as other embodiment.

Explanation of symbols

1 column beam frame, 5 braces, 10 friction dampers,
10a Friction damper, 10b Friction damper,
10c friction damper, 10d friction damper,
11 first pressure contact plate, 11a first pressure contact plate, 13 first through hole,
15 sliding plate, 21 second pressure contact plate, 23 second through hole, 25 friction plate,
31 3rd press contact plate, 31a 3rd press contact plate, 33 3rd through-hole,
35 friction plate, 41b high strength bolt (bolt member), 41n nut,
43 disc spring, 45 thin plate (plate member), 45a hole,
47 Round pipe (pipe member),
51 One brace piece, 51W web,
52 other brace piece, 52W web,
53 filler plate, 55 fastening part,
Ff friction force, Fs shear force, P external force, Fp support pressure,
S1 interval, S2 gap

Claims (7)

A friction damper that is disposed between a pair of members that move relative to each other in a predetermined direction in a building frame, and that suppresses the relative movement by a frictional force between pressure-contact plates that slide with the relative movement,
A first pressure contact plate provided on one member of the pair of members;
A second pressure contact plate provided on the other member of the pair of members;
A third pressure contact plate that sandwiches the first pressure contact plate from both sides with a predetermined pressure contact force with the second pressure contact plate;
In order to apply the pressure contact force, the first pressure contact plate is inserted through the first through hole long in the predetermined direction, the second pressure contact plate second through hole, and the third pressure contact plate third through hole. A bolt member provided;
A pipe member that is provided through the first through hole, the second through hole, and the third through hole while inserting the bolt member inside,
The first through hole allows sliding of the second pressing plate relative to the first pressing plate in the predetermined direction, and the third pressing plate is moved relative to the first pressing plate in conjunction with the sliding. The sliding force is applied from the second pressure contact plate through the engagement with the second through hole and the third through hole of the pipe member so as to slide in the predetermined direction. A friction damper characterized in that it is transmitted to three pressure plates. The friction damper according to claim 1,
A friction damper, wherein a gap is formed between the pipe member and the bolt member. The friction damper according to claim 1 or 2,
A sliding plate or a friction plate is fixed to both surfaces of the first pressure contact plate,
In the second press contact plate and the third press contact plate, a friction plate is fixed to a surface of the first press contact plate that faces the sliding plate, while a slide surface of the first press contact plate faces the friction plate. The board is fixed,
The friction damper, wherein the friction force is generated by sliding between the sliding plate and the friction plate. The friction damper according to any one of claims 1 to 3,
A nut that is screwed to the tip of the bolt member, and applies the pressure contact force to the first pressure contact plate, the second pressure contact plate, and the third pressure contact plate by the head of the bolt member;
A disc spring is inserted between at least one of the head and the press contact plate adjacent to the head, and between the nut and the press contact plate adjacent to the nut,
The friction damper according to claim 1, wherein the elastic force of the disc spring is applied to the first pressure plate, the second pressure plate, and the third pressure plate as the pressure force. The friction damper according to any one of claims 1 to 4,
A plate member having a hole having a diameter smaller than the outer diameter of the pipe member is fixed around the third through hole of the third pressure contact plate so that the hole matches the third through hole. ,
The friction damper, wherein the bolt member is passed through the hole. The friction damper according to any one of claims 1 to 5,
A plate member having a hole portion having a diameter smaller than the outer diameter of the pipe member is fixed around the second through hole of the second pressure contact plate so that the hole portion matches the second through hole. ,
The friction damper, wherein the bolt member is passed through the hole. The friction damper according to any one of claims 1 to 6,
The size of the gap between the pipe member in the predetermined direction is smaller in the second through hole and the third through hole than in the first through hole,
The size of the said clearance gap between said 2nd through-hole and said 3rd through-hole is an arbitrary value of the range of 0.1-3.0 mm, respectively, The friction damper characterized by the above-mentioned.