JP5050836B2 - 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. 2 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. 2, the friction damper 10d includes a first pressure contact plate 11 bolted to a 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. 2, the second press contact plate 21 and the third press contact plate 31 provided on the other brace segment 52 are provided with a separate fastening portion 55 in addition to the bolt 41b and the nut 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.

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

  In addition, in recent years, where the habitability under the effect of wind load is regarded as important due to the high rise of buildings, etc., in order to exhibit an appropriate vibration damping effect even for the wind load that is generally different from the external force level, In addition to making it possible to generate a large frictional force corresponding to a large external force P during an earthquake, it is also necessary to generate a small frictional force corresponding to a small external force P such as a wind load. However, in order to do so, a friction damper must be separately provided for each of the seismic and wind loads, and as a result, the above-described cost reduction and downsizing are further 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:
In a friction damper that is arranged between a pair of members that move relative to each other in a predetermined direction in a building frame and suppresses the relative movement by the frictional force between the pressure 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,
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. When sliding in the predetermined direction, the sliding force is applied from the second pressure contact plate through the engagement of the bolt member with the second through hole and the third through hole. The friction damper transmitted to the three pressure contact plates,
A gap is formed between the bolt member and the second through hole with respect to the predetermined direction,
The size of the gap between the bolt member with respect to the predetermined direction is smaller in the second through hole than in the first through hole and in the third through hole than in the second through hole. small,
The size of the gap of the third through hole is an arbitrary value in the range of 0.1 to 3.0 mm.

  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 bolt 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.

  In addition, a gap is formed between the bolt member and the second through hole in the predetermined direction. Therefore, when the relative movement amount of the pair of members is smaller than the gap, the bolt member does not engage with the second through hole, and thereby the force for sliding the third press contact plate is It is not transmitted from the second pressure contact plate to the third pressure contact plate. As a result, only the second pressure contact plate slides with respect to the first pressure contact plate, and the third pressure contact plate does not slide. Thus, vibration with a small relative movement amount, that is, vibration due to a small external force is generated. On the other hand, the friction damper generates a small frictional force, which enables the frictional damper to effectively dampen vibration caused by a small external force by the small frictional force.

  On the other hand, when the relative movement amount is larger than the size of the gap, the bolt member is engaged with the second through hole. Therefore, the force for sliding the third press contact plate is transmitted from the second press contact plate to the third press contact plate through the engagement of the bolt member with the second through hole and the third through hole. Thus, the third pressure contact plate slides relative to the first pressure contact plate in conjunction with the second pressure contact plate. As a result, the friction damper generates a large frictional force against vibrations with a large relative movement, that is, vibrations with a large external force. Can be attenuated.

In summary, according to this friction damper, it is possible to generate a frictional force of an appropriate magnitude according to the magnitude of both large and small external forces and dampen the vibration. Therefore, it is not necessary to provide a separate friction damper according to the size, and as a result, the cost and size of the friction damper can be reduced.
In addition, the size of the gap between the second through hole and the third through hole is made smaller than the size of the gap of the first through hole, and the third through hole is more than the second through hole. Since the hole is smaller and the size of the gap of the third through hole is set to an arbitrary value in the range of 0.1 to 3.0 mm, the second through hole and the third through hole at the time of construction While the bolt member can be easily inserted, the force for sliding the third pressure contact plate can be reliably transmitted from the second pressure contact plate to the third pressure contact plate.

The invention shown in claim 2 is the friction damper according to claim 1,
The friction coefficient when sliding with respect to the first pressure contact plate is different between the second pressure contact plate and the third pressure contact plate.
According to the second aspect of the present invention, the magnitude of the frictional force that should be generated when a large external force is applied and the magnitude of the frictional force that should be generated when a small external force is applied are expressed as follows: By adjusting the friction coefficient of the third pressure contact plate, it can be set almost independently, and the degree of freedom in setting the magnitude of the friction force is excellent.

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;
Between the pressure plate adjacent to the head and head portion, and at least one of between the pressure plate adjacent to the nut and the nut is inserted dish Banegakai,
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. It is possible to stabilize the magnitude of the pressure contact force, for example, it can be reduced.

  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. 3B and 3C are enlarged views of FIG. 3A, respectively. 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, high-strength bolts 41b (corresponding to bolt members) are passed through these through holes 13, 23, 33 in a skewered manner. 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 (= 2 × Ff or = 1 × Ff) is generated (see FIG. 3C or FIG. 3B). This frictional force becomes a damping force for vibration of the column beam frame 1. A disc spring 43 with a washer 45 is interposed between 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. By imparting the elastic force of 43, the magnitude of the pressure contact force is stabilized.

  By the way, in order to allow the above-mentioned sliding in the brace bridging direction, the first through hole 13 of the first pressure contact plate 11 is formed as a long long hole along the brace bridging direction (FIG. 3B). And see FIG. 4C). 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. The length L of the long hole 13 in the brace bridging direction is determined in consideration of the relative amount of movement between the brace pieces 51 and 52 assumed at the time of the earthquake.

  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 have gaps S23 and S33 in the brace bridging direction between the high strength bolt 41b. The first through hole 13 is formed in a perfect circle having a hole diameter that is smaller than the gap S13 (see FIGS. 3B and 4B to 4D).

  Specifically, as shown in FIG. 3B, the hole diameter of the third through hole 33 is set such that the clearance S33 in the brace bridging direction with the high-strength bolt 41b is substantially zero. The hole diameter of the through hole 23 is set such that a gap S23 having a size e is formed between the through hole 23 and the high strength bolt 41b in the brace bridging direction. The size e of the gap S23 is determined in consideration of the relative movement amount between the brace fragments 51 and 52 assumed when a wind load is applied to the column beam frame 1, and for example, the relative movement. It is set to a value that is the same as or slightly larger than the assumed value of the quantity.

  And if it becomes like this, it generate | occur | produces not only with respect to the big external force P at the time of an earthquake, but generate | occur | produces an appropriately big frictional force with respect to the small external force P like a wind load, and vibrates. Therefore, if at least one friction damper 10 is provided, the vibration of the column beam frame 1 can be effectively damped both during an earthquake and under the action of a wind load.

  Details are as follows. First, under the action of the wind load shown in FIG. 3B, since the external force P is small, the relative movement amount between the brace fragments 51 and 52 is also small. Further, as described above, the size e of the gap S23 between the high-strength bolt 41b and the second through hole 23 is larger than the relative movement amount in the brace bridging direction assumed under the action of the wind load. Is set. Therefore, even if the column beam frame 1 vibrates, the high-strength bolt 41b only moves relative to the gap S23 and does not contact and engage with the inner peripheral surface of the second through hole 23. There is no force in the brace bridging direction from the second pressure contact plate 21 to the high strength bolt 41b, and the force is inevitably used as the support pressure Fp for sliding the third pressure contact plate 31. There is no transmission from the plate 21 to the third press contact plate 31. As a result, a state is created in which only the second pressure contact plate 21 slides with respect to the first pressure contact plate 11 and the third pressure contact plate 31 does not slide, and therefore, vibration with a small relative movement amount, that is, a small external force. With respect to vibration due to P, the friction damper 10 generates a small frictional force (= 1 × Ff) as shown in FIG. 3B, whereby the friction damper 10 is caused by a small external force P due to wind load. The vibration can be effectively damped by the corresponding small frictional force (= 1 × Ff).

On the other hand, since the external force P is large in the event of an earthquake, the relative movement amount between the brace pieces 51 and 52 is larger than the size e of the gap S23 between the high-strength bolt 41b and the second through hole 23. Accordingly, with the relative movement, the high-strength bolt 41b comes into contact with and engages with the inner peripheral surface of the second through hole 23 as shown in FIG. 3C. Then, the support pressure Fp due to this abutting engagement passes through the form of the shearing force Fs in the high-strength bolt 41b and then passes through the abutting engagement with the inner peripheral surface of the third through hole 33 of the high-strength bolt 41b. The pressure contact plate 21 is transmitted from the pressure contact plate 21 to the third pressure contact plate 31, and the transmitted support pressure Fp acts to slide the third pressure contact plate 31. The pressure contact plate 31 also slides with respect to the first pressure contact plate 11. As a result, the friction damper 10 generates a large frictional force (= 2 × Ff) as shown in FIG. 3C for vibration with a large relative movement amount, that is, vibration with a large external force P. The friction damper 10 can effectively dampen the vibration caused by the large external force P at the time of the earthquake by the corresponding large friction force (= 2 × Ff). Incidentally, the shear force Fs, the support pressure Fp, the friction force Ff, and the external force P in FIG. 3C are in the following balanced relationship.
Fs = Fp = Ff
P = 2 × Ff

  FIG. 5 is a graph showing the vibration energy absorption history characteristics of the friction damper 10. This graph is a graph obtained by forcibly oscillating with a predetermined amplitude δ1 or amplitude δ2 in the brace spanning direction. The horizontal axis indicates the relative displacement δ in the brace spanning direction, and the vertical axis indicates the friction. A sum ΣFf of frictional forces generated by the damper 10 is shown. The amplitude δ1 is an assumed amplitude amount at the time of an earthquake, and the amplitude δ2 is an assumed amplitude amount under the action of a wind load.

In FIG. 5, under the action of the wind load indicated by the square ABCD, as described above, only the second pressure contact plate 21 of the friction damper 10 slides and the third pressure contact plate 31 does not slide. One side. Therefore, when the friction coefficient between the sliding plate 15 and the friction plate 25 is μ0 and the pressure contact force is N, the total friction force ΣFf generated by the friction damper 10 at this time is expressed by the following equation a.
ΣFf = 1 × Ff
= 1 × μ0 × N …… Formula a

On the other hand, at the time of an earthquake, not only the second pressure contact plate 21 but also the third pressure contact plate 31 slide, so that there are two sliding surfaces. Therefore, the sum ΣFf of the frictional force generated by the friction damper 10 in that case is twice as large as that under the wind load action as indicated by the line segment HI and the line segment LE in the polygon EFGHIJKL in FIG. That is, it is expressed as the following formula b.
ΣFf = 2 × Ff
= 2 × μ0 × N …… Formula b

  As shown in FIG. 5, in the range FG, JK of the magnitude E from the folding position F or J in the relative movement direction in the polygon EFGHIJKL, the sum ΣFf of the generated frictional force is expressed by the equation b However, in this range FG, JK, the reason is that the third pressure contact plate 31 is in relation to the first pressure contact plate 11 based on the action of the gap S23. It is because it will be in the state which does not slide.

  By the way, in the above description, the friction plate 25 of the second pressure contact plate 21 and the friction plate 35 of the third pressure contact plate 31 are based on the same material, that is, the friction coefficient between the sliding plate 15 of the first pressure contact plate 11 is mutually equal. Although the description has been made on the assumption that they are the same μ0, in this case, as described above, the total friction force ΣFf (= 1 × Ff) under the action of wind load is the total friction force ΣFf (= 2 × Ff) during an earthquake. ), And the friction damper 10 becomes difficult to design.

  With regard to this point, if the materials of the friction plate 25 and the friction plate 35 are different from each other, the friction coefficient when the second pressure contact plate 21 slides with respect to the first pressure contact plate 11 and the friction when the third pressure contact plate 31 slides. The friction coefficients can be made different from each other. As a result, the above constraint conditions can be solved and the friction damper 10 can be easily designed.

=== 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. In addition, the first and third through holes 13 and 33 are high-strength bolts passed through the first to third through holes 13, 23 and 33 of the first embodiment. 41b is inserted and fastened by a nut 41n at the tip thereof.

  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.

  Note that the third press-contact plate 31 a additionally installed also applies a force for sliding against the first press-contact plate 11 a to contact the high-strength bolt 41 b with the third through-hole 33 and the second through-hole 23. Needless to say, it is applied from the second pressure contact plate 21 through the engagement. The point that the friction damper 10a can generate two magnitudes of frictional force is also the same as in the first embodiment by the gap S23 between the second through-hole 23 and the high-strength bolt 41b.

  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, the high pressure bolt 41 b is applied from the second pressure contact plate 21 through contact engagement between the third through hole 33 and the second through hole 23. Further, the point that the friction dampers 10b and 10c can generate two magnitudes of frictional force by the gap S23 with the high-strength bolt 41b in the second through hole 23 is the same as in the first embodiment. .

  The friction dampers 10a, 10b, and 10c of the embodiments of FIGS. 6 to 8 are superior to the friction damper 10 of the first embodiment in terms of stability of the pressure contact force under the action of wind load. That is, as shown in FIGS. 3B and 3C, in the case of the friction damper 10 according to the first embodiment, the second pressure contact plate 21 is disposed adjacent to the disc spring 43, so that the wind load is applied. The second pressure contact plate 21 moves relative to not only the first pressure contact plate 11 but also the disc spring 43 in the brace bridging direction. As a result, the stability of the pressure contact force of the disc spring 43 is improved. There is a risk of damage. In this regard, in the embodiment shown in FIGS. 6 to 8, since the third press contact plates 31 and 31a are adjacent to the disc spring 43, the second press contact plate 21 slides in the brace bridging direction. Even if it moves, the disc spring 43 does not move relative to the third press-contact plates 31 and 31a in general, so that the press-contact force of the disc spring 43 is stabilized.

=== Other Embodiments ===
Having described embodiments of the present invention, the present invention is not limited to such embodiments, but may be modified as described below without departing from the spirit thereof.

  In the embodiment described above, the hole diameter of the third through-hole 33 has been described such that the clearance S33 in the brace bridging direction with the high-strength bolt 41b is set to be substantially zero. The hole diameter of the three through holes 33 may be as small as possible within a range where there is no problem in passing the high strength bolt 41b during construction. For example, the clearance S33 between the high strength bolt 41b when the high strength bolt 41b is inserted The brace spanning direction may be in the range of 0.1 to 3.0 mm. If it does so, it becomes possible to transmit the supporting pressure Fp required for sliding to the 3rd press-contact plate 31 reliably, making the bolting operation | work at the time of construction easy.

  Further, in the friction dampers 10a, 10b, and 10c of the four-surface, six-surface, and eight-surface friction exemplified in FIGS. 6, 7, and 8, all of the plurality of third press-contact plates 31 are the high-strength bolts 41b. The macroscopic gap S33 was not formed between the two, but the present invention is not limited to this. The macroscopic gap S23 is macroscopically formed with respect to at least one of the through holes 33 of the plurality of third press-contact plates 31. A gap of a desired size may be formed. In this way, the magnitude of the frictional force generated by the friction damper 10 can be changed in more stages according to the relative movement amount.

  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 configuration including only one high-strength bolt 41b is illustrated, but the present invention is not limited to this. That is, 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 high strength bolt 41b for applying the pressure contact force. In this case, a plurality of high strength bolts 41b may be installed. 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.

  In the above-described embodiment, a circular through hole is illustrated as the second through hole 23 of the second pressure contact plate 21. However, the second through hole 23 may be a through hole that forms a gap having the same size e as the gap S23 in the brace bridging direction. Other shapes may be used, and for example, a long hole extending in the direction of bracing may be used.

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. 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 springs, 45 washers,
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 gap, S13 gap, S23 gap, S33 gap

Claims (4)

In a friction damper that is arranged between a pair of members that move relative to each other in a predetermined direction in a building frame and suppresses the relative movement by the frictional force between the pressure 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,
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. When sliding in the predetermined direction, the sliding force is applied from the second pressure contact plate through the engagement of the bolt member with the second through hole and the third through hole. The friction damper transmitted to the three pressure contact plates,
A gap is formed between the bolt member and the second through hole with respect to the predetermined direction,
The size of the gap between the bolt member with respect to the predetermined direction is smaller in the second through hole than in the first through hole and in the third through hole than in the second through hole. small,
The size of the gap in the third through hole is an arbitrary value in the range of 0.1 to 3.0 mm. The friction damper according to claim 1,
The friction damper according to claim 1, wherein a friction coefficient when sliding with respect to the first pressure contact plate is different between the second pressure contact plate and the third pressure contact plate. 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;
Between the pressure plate adjacent to the head and head portion, and at least one of between the pressure plate adjacent to the nut and the nut is inserted dish Banegakai,
Wherein the elastic force of the disc spring as the contact pressure first pressure plate, said second pressure plate, friction damper, characterized in that applied to the third pressing plate.