JP6782868B1 - Damping brace frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration damping brace frame provided with a brace formed of a shaped steel material having orthogonal webs and flanges and further provided with a friction damper in a rectangular frame frame, in which a bending moment in two directions acts on the friction damper. To provide a vibration damping brace frame that can prevent changes in the vibration damping performance of the friction damper by eliminating the above. SOLUTION: This is a vibration damping brace frame 50 in which a brace 20 is arranged on a rectangular frame frame 10 formed by a pillar 11 and a beam 12 which constitutes a building, and the brace 20 is orthogonal to each other. The first friction damper 30A is attached to the flange 21 in the bending moment non-generating region 38 of the brace 20 where the bending moment is zero, and the web is formed of a shaped steel material having the web 22 and the flange 21. A second friction damper 30B is attached to 22. [Selection diagram] Fig. 1

Description

The present invention relates to a vibration damping brace frame.

There are ramen frames, brace frames, etc. in the frames that make up a building, but in the brace frame, braces are arranged inside a rectangular frame-shaped frame (rectangular frame frame) formed by columns and beams. It is formed by On the other hand, in the rigid frame frame, although it is not always necessary to dispose the brace in the structure, the bending moment is predominant in the vicinity of the joint corner between the column and the beam, and in order to cope with this bending moment, the column or the like is provided. The cross-sectional dimensions of the shaped steel material to be formed tend to be large. Therefore, by arranging braces inside the rigid frame frame and making the braces bear a part of the bending moment, measures can be taken to reduce the cross-sectional dimensions of columns and beams and reduce the total number of steel materials. In some cases.

By the way, a friction damper may be applied for the purpose of improving the vibration damping performance of the brace frame in which the brace is arranged in the rectangular frame frame formed by the columns and the beams. This friction damper is generally arranged at the connection portion between the rectangular frame frame and the brace, and for example, Patent Document 1 discloses an example of the configuration. More specifically, friction dampers are provided in the vicinity of the corners of the rectangular frame frame, in the vicinity of the beams constituting the rectangular frame frame, and the like.

Japanese Unexamined Patent Publication No. 2012-102809

Various steel materials such as flat steel and H-shaped steel described in Patent Document 1 are applied to the brace, and both when flat steel is applied and when H-shaped steel described in Patent Document 1 is applied. For example, friction materials (friction plates) are arranged on both side surfaces of a brace and a gusset plate protruding from a rectangular frame frame, and the friction materials on both sides are sandwiched between two steel plates (pressure welding plates in Patent Document 1). A friction damper is formed by bolt-joining with a predetermined compressive force applied. For example, when the brace frame is deformed during an earthquake and an axial force acts on the brace, the friction damper exerts frictional resistance to reduce the axial force of the brace.

However, as shown in FIG. 1 of Patent Document 1, when the mounting position of the friction damper is near the corner of the rectangular frame frame or near the beam of the rectangular frame frame, bending moments are generated at these positions. Therefore, this bending moment acts on the friction damper. When the bending moment acts on the friction damper in the direction orthogonal to the friction surface, the tension of the bolt changes, and the vibration damping performance (or friction characteristics) of the friction damper may change. As described above, a solution to the problem that the bending moment acts on the friction damper in the direction orthogonal to the friction surface and the vibration damping performance of the friction damper changes has not been disclosed in the past, including Patent Document 1.

Further, when the brace is formed of a shaped steel material such as H-shaped steel, the web and the flange extend in two directions orthogonal to each other in cross-sectional view, and the generated bending moment also has a bending moment peculiar to these two directions. Although it will occur, when the friction damper is attached to a brace made of a shaped steel material having a cross section extending in two directions in this way, the bending moment is applied to one or both of the web and the flange. Naturally, a solution to the problem that tension acts and the friction characteristic of the friction damper changes due to the change in tension of the bolt caused by the action of the tension has not been disclosed conventionally.

The present invention relates to a vibration damping brace frame in which a rectangular frame frame is provided with a brace formed of a shaped steel material having orthogonal webs and flanges and is further provided with a friction damper, and a bending moment in two directions acts on the friction damper. It is an object of the present invention to provide a vibration damping brace frame capable of preventing a change in the vibration damping performance of the friction damper by solving the problem.

In order to achieve the above object, one aspect of the vibration damping brace frame according to the present invention is
A vibration-damping brace frame in which braces are arranged in a rectangular frame frame formed by columns and beams that compose a building.
The brace is formed of a shaped steel material having webs and flanges that are orthogonal to each other.
A first friction damper is attached to the flange and a second friction damper is attached to the web in a bending moment non-occurring region of the brace where the bending moment is zero.

According to this aspect, the friction dampers (first friction damper, second friction damper) are attached to the bending moment non-generating region where the bending moment is zero among the braces formed of the shaped steel material having the web and the flange. By doing so, it is eliminated that the bending moment in two directions peculiar to each friction damper acts, and when the bending moment acts on the friction damper, the tension of the bolt changes and the vibration damping performance of each friction damper is improved. There is no problem of change.

Here, the shaped steel material provided with the web and the flange is formed of angle steel, channel steel, H-shaped steel, and cross-shaped steel (for example, a vertical web and two flanges protruding to the left and right at the center of the web. For example, in the case of H-shaped steel, a first friction damper is attached to each of the two flanges, and a second friction damper is attached to the web. In addition, since unique bending moments are generated in each of the web and the flange that form the molded steel material and are orthogonal to each other, these are referred to as "bidirectional bending moments". For example, if the brace is made of channel steel, the web will have a bending moment in one direction and the two flanges will have a bending moment in the other direction.

In this embodiment, for example, in a form in which the brace is arranged along the diagonal line of the rectangular frame frame, when the end of the brace and the corner portion of the rectangular frame frame are rigidly joined, no bending moment is generated. Since the region is the intermediate position (center position) of the brace, the friction damper is attached to the intermediate position of the brace. On the other hand, for example, when one end of the brace and one corner of the rectangular frame frame are rigidly joined, and the other end of the brace and the other corner of the rectangular frame frame are pin-coupled, this pin coupling portion is This is the region where the bending moment does not occur. Therefore, in the latter form, the friction damper is attached to one end of the brace and the pin connection portion at the corner of the rectangular frame frame.

Further, in another aspect of the vibration damping brace frame according to the present invention, the rectangular frame frame and the brace are rigidly joined.
The bending moment non-generating region is located at the intermediate position of the brace.
The brace is formed of the two shaped steel materials, and the two shaped steel materials are connected to each other via the first friction damper and the second friction damper arranged at the intermediate position. And.

According to this aspect, in the vibration damping brace frame in which the rectangular frame frame and the brace are rigidly joined, the friction damper (first friction damper, second friction) is located at the intermediate position in the longitudinal direction of the brace where the bending moment becomes zero. By attaching the damper), the bending moment in two directions peculiar to each friction damper is eliminated, and the vibration damping performance of each friction damper does not change.

Further, in another aspect of the vibration damping brace frame according to the present invention, the shaped steel material is H-shaped steel or cross-shaped steel.
The two H-shaped steels or the two cross-shaped steels constituting the brace are arranged with a gap in the longitudinal direction of the brace, and the flanges of both the H-shaped steels or the cross-shaped steels. The webs of both the H-shaped steels or the cross-shaped steels are connected to each other by the first friction damper, and the webs are connected to each other by the second friction damper.

According to this aspect, the brace is formed of H-shaped steel or cross-shaped steel having two flanges (both are shaped steel materials having webs and flanges orthogonal to each other), thereby forming a chevron shape. Compared with other shaped steel materials such as steel, it is possible to form a brace having higher rigidity in both the strong axis direction and the weak axis direction of the shaped steel material. Here, a bracket projects from the corner of the rectangular frame frame into the frame surface, and the bracket and the H-shaped steel or the cross-shaped steel are rigidly joined. Brackets may be made of H-section or cross-steel similar to the H-section or cross-steel forming the brace, or on the gusset plate (flat steel) attached to the web and the two flanges of the brace. The fin stiffener (flat steel) to be attached may be welded to the gusset plate. In both types of brackets, the brackets and the corresponding members of the brace (gusset plate and fin stiffener, and the web and flange of the brace) are bolted together with high-strength bolts via the splice plate to form a rectangle. The corners of the frame frame and the braces are rigidly joined.

Further, in another aspect of the vibration damping brace frame according to the present invention, two friction materials are arranged on both side surfaces of the flange, and two pressure-welded steel plates are arranged so as to sandwich the two friction materials. The first friction damper is formed by inserting bolts into bolt holes penetrating the friction material and the pressure-welded steel plate and joining them with bolts.
Two friction materials are arranged on both side surfaces of the web, two pressure-welded steel plates are arranged so as to sandwich the two friction materials, and bolts are provided in the bolt holes penetrating the web, the friction material, and the pressure-welded steel plate. The second friction damper is formed by being inserted and bolted together.

According to this aspect, two H-shaped steel or two cross-shaped steel flanges connected to each other via a friction damper, and webs are arranged on both side surfaces of friction materials (friction plates). ) And the pressure-welded steel plates on the outside of the friction material on both sides, and by bolting, a vibration-damping brace frame equipped with a friction damper that can control the friction force by the tightening force of the bolt is formed. Will be done. Here, in the H-shaped steels to be interconnected (for example, the first H-shaped steel and the second H-shaped steel), the second H-shaped steel is bolted to the pressure-welded steel plate. On the other hand, the above-mentioned friction material is disposed on the other first H-section steel, and a pressure-welded steel plate extending from the second H-section steel side is disposed on the friction material. Is tightened with a predetermined tightening force to form a friction damper. The design friction force by the friction damper is set by the friction coefficient between the friction material and the pressure-welded steel plate, the tightening force introduced into the bolt, and the number of bolts. When the shaped steel material is cross-shaped steel (for example, the first cross-shaped steel and the second cross-shaped steel are interconnected), the design frictional force by the friction damper is set by the same method.

In the webs and flanges that form the brace, one (or one set) of friction material is an odd number of bolts (one, three, etc., and if there are three or more, each bolt is lined up at equal intervals). When tightening, install the brace in the rectangular frame frame so that the center bolt (or the bolt itself if there is one bolt) is positioned at the middle position (center position) in the longitudinal direction of the brace. Therefore, it is assumed that the friction damper is arranged in the moment-free region. On the other hand, when one (or one set) friction material is tightened with an even number of bolts (two, four, etc., and each bolt is lined up at equal intervals), the center position of the multiple bolts is By mounting the brace in the rectangular frame frame so as to be positioned at the intermediate position (center position) in the longitudinal direction of the brace, the friction damper is arranged in the moment non-generating region.

Further, in another aspect of the vibration damping brace frame according to the present invention, the first friction coefficient between the pressure-welded steel plate and the friction material is higher than the second friction coefficient between the friction material and the flange or the web. If it is also small, the friction material and the flange or the web are in surface contact in a non-bonded state.
When the first friction coefficient is larger than the second friction coefficient, the friction material is joined to the flange or the web.

According to this aspect, depending on the magnitude relationship between the first friction coefficient between the pressure-welded steel plate and the friction material and the second friction coefficient between the friction material and the flange or the web, the friction material and the flange or the web By treating the contact surface, the sliding friction between the desired pressure-welded steel plate and the friction material can be guaranteed, and the vibration damping performance of the friction damper can be exhibited. Here, "joining" includes welding joining and joining with an adhesive. Further, "surface contact in a non-bonded state" means a state in which the friction material and the flange or the web are simply in surface contact.

As can be understood from the above description, according to the vibration damping brace frame of the present invention, the rectangular frame frame is provided with a brace formed of a shaped steel material having orthogonal webs and flanges, and further provided with a friction damper. With respect to the vibration brace frame, it is possible to prevent a change in the vibration damping performance of the friction damper by eliminating the action of bending moments in two directions on the friction damper.

It is a front view of an example of the vibration damping brace frame which concerns on embodiment. FIG. 2 is a sectional view taken along line II-II of FIG. It is a bending moment distribution map generated when the horizontal force at the time of an earthquake acts on the vibration damping brace frame which concerns on embodiment.

Hereinafter, the vibration damping brace frame according to the embodiment will be described with reference to the attached drawings. In the present specification and the drawings, substantially the same components may be designated by the same reference numerals to omit duplicate explanations.

[Vibration damping brace frame according to the embodiment]
An example of the vibration damping brace frame according to the embodiment will be described with reference to FIGS. 1 to 3. Here, FIG. 1 is a front view of an example of the vibration damping brace frame according to the embodiment, and FIG. 2 is a sectional view taken along line II-II of FIG. Further, FIG. 3 is a bending moment distribution diagram generated when a horizontal force during an earthquake acts on the vibration damping brace frame according to the embodiment.

The vibration damping brace frame 50 shown in the figure constitutes a building, and in a rectangular frame frame 10 formed by columns 11 and beams 12, a friction damper 30 is interposed between two corner portions 13 on the diagonal line thereof. It is formed by disposing the brace 20 to be used.

Both the pillar 11 and the beam 12 are formed of a shaped steel material such as H-shaped steel or a square steel pipe. In the illustrated example, the beam 12 formed of H-shaped steel is welded to the pillar 11 formed of the square steel pipe. The rectangular frame frame 10 is formed by joining or bolting.

Of the four inner corners of the rectangular frame frame 10, brackets 15A and 15B made of flat steel are provided at the upper left corner 13A and the lower right corner 13B on the diagonal line. It is welded and joined. The inner end faces of the flat steels 15A and 15B are in contact with the end faces of the web 22 of the brace 20 formed of the H-shaped steel. The brace 20 in the illustrated example is formed of H-shaped steel, but in addition, the brace may be formed of cross-shaped steel or the like, and when the brace is formed of cross-shaped steel, the bracket also corresponds to the brace. A cross-section bracket is applied.

Of the wide surfaces of the brackets 15A and 15B formed of flat steel, the fin stiffeners 16A and 16B are welded and joined at the positions corresponding to the two flanges 21 of the brace 20, and the brackets 15A (15B) are constructed. When viewed from the inside, a bracket having an H-shaped cross section formed by a flat steel in the center and two sets of fin stiffeners 16A and 16B on the left and right sides of the flat steel is formed. The bracket may be made of H-section steel having the same dimensions as the H-section steel applied to the brace.

Braces 20A and 20B having different lengths are attached to the two diagonal brackets 15A and 15B, respectively. Both the braces 20A and 20B are formed of H-shaped steel (an example of a shaped steel material) having a web 22 (22A, 22B) and two flanges 21 (21A, 21B).

A brace 20A having a relatively short length is arranged with respect to the upper left bracket 15A provided with the fin stiffener 16A, the end faces of the corresponding fin stiffener 16A and the flange 21A are brought into contact with each other, and the flat steel 15A and the web 22A are brought into contact with each other. The end faces are brought into contact with each other. Then, the splice plate 18A is arranged so as to straddle the fin stiffener 16A and the flange 21A, the splice plate 19A is arranged so as to straddle the flat steel 15A and the web 22A, and the fin stiffener 16A, the flange 21A, and the flat steel 15A are arranged. By bolting the web 22A with a plurality of high-strength bolts 18A, the bracket 15A on the upper left of the structure and the end of the brace 20A are rigidly joined.

On the other hand, a brace 20B having a relatively long length is arranged with respect to the lower right bracket 15B provided with the fin stiffener 16B, and the end faces of the corresponding fin stiffener 16B and the flange 21B are brought into contact with each other to form a flat steel 15B. The end faces of the web 22B are brought into contact with each other. Then, the splice plate 18B is arranged so as to straddle the fin stiffener 16B and the flange 21B, the splice plate 19B is arranged so as to straddle the flat steel 15B and the web 22B, and the fin stiffener 16B, the flange 21B, and the flat steel 15B are arranged. By bolting the web 22B with a plurality of high-strength bolts 18B, the ends of the bracket 15B and the brace 20B at the lower right of the structure are rigidly joined.

In a state where one end of the brace 20A is rigidly joined to the bracket 15A and one end of the brace 20B is rigidly joined to the bracket 15B, a gap G is formed between the other end of the brace 20A and the other end of the brace 20B. Then, the corresponding flanges 21A and 22A of the braces 20A and 20B and the webs 22A and 22B are connected to each other via the first friction damper 30A and the second friction damper 30B, respectively, thereby forming a vibration damping brace frame. 50 is formed.

As is clearly shown in FIG. 2, the upper and lower flanges 21 of the braces 20A and 20B are connected to each other by the first friction dampers 30A on the left and right sides of the web 22. On the other hand, the webs 22 of the braces 20A and 20B are connected to each other by the second friction damper 30B at the height center position of the webs 22.

Returning to FIG. 1, on the brace 20A having a relatively short length, height adjusting plates 35 made of flat steel are arranged on both sides of the upper and lower flanges 21A and both sides of the web 22A, respectively, and sandwich them. One end side of the pressure-welded steel plate 32 is arranged so as to be bolted by a high-strength bolt 36. That is, in the short brace 20A, no friction material is interposed between the pressure-welded steel plate 32 and the flange 21A or the web 22A, and a height adjusting plate 35 having a thickness similar to the thickness of the friction material is interposed, and the pressure-welded steel plate 32 is interposed. One end side of is tied.

On the other hand, in the brace 20B having a relatively long length, friction materials 31 are arranged on both sides of the upper and lower flanges 21B and both sides of the web 22B, and the other end side of the pressure-welded steel plate 32 is arranged so as to sandwich them. It is installed and bolted by a high-strength bolt 33. In the friction damper 30 of the illustrated example, the upper and lower flanges 21B have four sets of upper and lower friction materials 31 that sandwich the flange 21B in one cross section as shown in FIG. 2, and are braces as shown in FIG. There are four sets of friction materials 31 at equal intervals in the longitudinal direction of 20B, and therefore a total of 16 sets of friction materials 31 are applied. Further, the web 22B has four sets of friction materials 31 sandwiching both sides of the web 22B in the longitudinal direction of the brace 20B as shown in FIG. 1, and therefore a total of four sets of friction materials 31 are applied. There is. Therefore, a total of 20 sets of friction materials 31 are applied to the braces in the illustrated example on the web 22B and the flange 21B. The number of friction materials 31 to be applied can be variously set depending on a desired design friction force, a tightening force that can be introduced into a bolt, a friction coefficient between the pressure-welded steel plate 32 and the friction material 31, and the like.

Here, the H-shaped steel and the pressure-welded steel plate 32 forming the brace 20 can be formed of a general thick plate steel material for construction, stainless steel, titanium steel, or the like. Further, the friction material 31 is formed of a resin plate or the like in addition to a metal plate such as an aluminum plate. This resin plate can be formed of a thermosetting resin or the like containing glass fibers, carbon fibers, or the like.

As shown in FIG. 1, when the total length of the brace by the two brace 20A and 20B (including the gap G between the brace 20A and 20B) is the length t, the intermediate position in the longitudinal direction of the brace (from the end). The entire brace is configured so that the central positions of the four sets of high-strength bolts 33 arranged at equal intervals in the longitudinal direction of the brace are positioned at the t / 2 position).

The frictional force of each high-strength bolt 33 is set by the predetermined tightening force introduced into each high-strength bolt 33 and the friction coefficient between the pressure-welded steel plate 32 and the friction material 31, and in the illustrated example, it is one. The design frictional force is set by multiplying the frictional force by the high-strength bolt 33 per unit by 20.

Here, when the friction coefficient between the pressure-welded steel plate 32 and the friction material 31 is the first friction coefficient and the friction coefficient between the friction material 31 and the flange 21B or the web 22B is the second friction coefficient, the first friction coefficient is used. When the friction coefficient is smaller than the second friction coefficient, the friction material 31 and the flange 21B or the web 22B are simply brought into surface contact in a non-bonded state.

On the other hand, when the first friction coefficient is larger than the second friction coefficient, the friction material 31 and the flange 21B or the web 22B are joined by welding or an adhesive.

In this way, depending on the magnitude relationship between the first friction coefficient between the pressure-welded steel plate 32 and the friction material 31 and the second friction coefficient between the friction material 31 and the flange 21B or the web 22B, the friction material 31 and the friction material 31 By treating the contact surface of the flange 21B or the web 22B, it is possible to guarantee the sliding friction between the desired pressure-welded steel plate 32 and the friction material 31, and the vibration damping performance of the friction damper 30 can be exhibited.

FIG. 3 shows the bending moment distribution generated in each member when the horizontal force P at the time of an earthquake acts on the vibration damping brace frame 50, and more specifically, the bending moment generated in the column 11 is expressed in Mc. Shown, the bending moment generated in the beam 12 is indicated by Mg, and the bending moment generated in the brace 20 is indicated by Mb.

In a structure in which the columns 11 and beams 12 are rigidly connected to each other to form a rectangular frame frame 10, and the ends of the braces 20 are rigidly connected to the corners 13A and 13B of the rectangular frame frame 10, the columns are columns. The bending moments Mc, Mg, and Mb are maximized at the ends of the 11 and the beam 12, and the brace 20, and the bending moment is zero at the intermediate position of each member. Therefore, the bending moment is zero (Mb = 0) at the intermediate position of the brace 20, and in the illustrated example, the bending moment non-occurring region 38 is set including the position where the bending moment is zero or the region around it. Then, the central position of the friction damper 30 (the central position of the four sets of high-strength bolts 33 arranged at equal intervals) is positioned in the bending moment non-occurrence region 38.

Since the brace 20 includes the web 22 and the flange 21 that are orthogonal to each other, the brace 20 may generate bending moments in two directions with respect to the web 22 and the flange 21, respectively. However, in the vibration damping brace frame 50 of the illustrated example, the friction damper 30 is attached to the brace 20 so that the central position of the friction damper 30 is arranged in the bending moment non-generating region 38, so that the brace 20 It is eliminated that the bending moment in two directions is generated. As a result, the tension introduced into the high-strength bolt 33 changes due to the generated bidirectional bending moment, and there is no problem that the friction characteristics of the friction damper 30 change. Therefore, according to the vibration damping brace frame 50, the first friction damper 30A and the second friction damper 30B attached to the flange 21 and the web 22 constituting the brace 20 can exhibit the initial friction characteristics. Become.

It should be noted that the configuration or the like described in the above embodiment may be another embodiment in which other components are combined, and the present invention is not limited to the configuration shown here. This point can be changed without departing from the spirit of the present invention, and can be appropriately determined according to the application form thereof.

10: Rectangular frame frame 11: Pillar 12: Beam 13A, 13B: Corner part 15A, 15B: Bracket (flat steel)
16A, 16B: Fin stiffeners 17A, 17B: Splice plates 18A, 18B: High-strength bolts 19A, 19B: Splice plates 20, 20A, 20B: Brace (H-shaped steel, shaped steel)
21,21A, 21B: Flange 22,22A, 22B: Web 30: Friction damper 30A: First friction damper 30B: Second friction damper 31: Friction material 32: Pressure-welded steel plate 33: High-strength bolt 34: Bolt hole 35: High Friction adjustment plate 36: High-strength bolt 38: Bending moment non-generation area 50: Vibration damping brace frame G: Gap

Claims (3)

A vibration-damping brace frame in which braces are arranged in a rectangular frame frame formed by columns and beams that compose a building.
The brace is formed of a shaped steel material having webs and flanges that are orthogonal to each other.
In the bending moment non-occurring region of the brace where the bending moment is zero, the first friction damper is attached to the flange, and the second friction damper is attached to the web .
Two friction materials are arranged on both side surfaces of the flange, two pressure-welded steel plates are arranged so as to sandwich the two friction materials, and bolts are formed in the flange and the bolt holes penetrating the friction material and the pressure-welded steel plate. The first friction damper is formed by being inserted and bolted together.
Two friction materials are arranged on both side surfaces of the web, two pressure-welded steel plates are arranged so as to sandwich the two friction materials, and bolts are provided in the bolt holes penetrating the web, the friction material, and the pressure-welded steel plate. The second friction damper is formed by being inserted and bolted together.
When the first friction coefficient between the pressure-welded steel plate and the friction material is smaller than the second friction coefficient between the friction material and the flange or the web, the friction material and the flange or the web It is in surface contact in a non-bonded state and is in surface contact.
When the first friction coefficient is larger than the second friction coefficient, the vibration damping brace frame is characterized in that the friction material is joined to the flange or the web. The rectangular frame frame and the brace are rigidly joined to each other.
The bending moment non-generating region is located at the intermediate position of the brace.
The brace is formed of the two shaped steel materials, and the two shaped steel materials are connected to each other via the first friction damper and the second friction damper arranged at the intermediate position. The vibration damping brace frame according to claim 1. The shaped steel material is H-shaped steel or cross-shaped steel.
The two H-shaped steels or the two cross-shaped steels constituting the brace are arranged with a gap in the longitudinal direction of the brace, and the flanges of both the H-shaped steels or the cross-shaped steels. The first or second aspect of claim 1 or 2, wherein the webs of both the H-shaped steels or the cross-shaped steels are connected to each other by the first friction damper, and the webs of the cross-shaped steels are connected to each other by the second friction damper. The described anti-vibration brace frame.

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