JP2000186372A - Buckling constraining brace member and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buckling constraining brace member, in which the shape of a central axial-force member is held in a plane shape and which has excellent accuracy and quality and is adapted to a long-sized material. SOLUTION: A tabular central axial-force member 3, by which an earthquake ground motion is damped in a hysteretic manner by a yield plastic behavior, has a metallic pipe 2a and concrete 2b placed into the metallic pipe 2a in a manner that the tabular central axial-force member 3 can be inserted. Holding members holding the tabular central axial-force member 3 at a plurality of places in the axial-force direction from the two plate surface sides of the tabular central axial-force member 3 when concrete 2b is placed and disposed while being penetrated to the wall of the metallic pipe 2a or a member 2 for constraining buckling having cavities, from which the holding members are extracted, or the traces of the holding members capable of being discriminated by fillers closing the cavities are inserted into concrete 2b through an adhesion preventive film 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buckling restraint bracing member and a method for manufacturing the same, and more particularly to a buckling restraint bar for a large-scale building such as a large span building, a large-scale stadium, and a high-rise building. In the paddle member, it is particularly advantageous when the shape of the plate-shaped central axial force member (core material) is secured and assured in a planar shape in the axial force direction.

[0002]

2. Description of the Related Art Japanese Unexamined Utility Model Publication No. 4-19121 discloses a buckling restraint bracing member. Real fairness 4
The buckling restraint bracing member shown in Japanese Patent Publication No.
As shown in the figure, the steel central axial force member 15 is inserted through the buckling restraint concrete member 13 reinforced by the steel pipe 14,
Steel central axial force member 15 and buckling restraint concrete member 1
3, an anti-adhesion coating 16 is interposed. Incidentally, the production length of such a buckling restraint bracing member is usually 7 to 8 m. The outline of the manufacturing method will be described below with reference to FIG.

[0003] In FIG. 7, a steel pipe 14 is erected in a vertical direction, and a steel central axial force member 15 is provided in the erected steel pipe 14.
Through. Here, the anti-adhesion coating 16 is applied to the steel central axial force member 15 in advance (see FIG. 6B). Next, concrete 19 is poured into the steel pipe 14 to form the buckling restraining concrete member 13. Prior to placing the concrete 19, the steel central axial force member 15 is aligned with the steel pipe 14,
Are fixed to both ends of the steel pipe 14 with jigs 17. As shown in FIG. 8, the concrete is poured from above the steel pipe 14 by the casting hose 18. The concrete 19 is charged into the upper part of one of the left and right spaces of the steel central axial force member 15 in the steel pipe 14.
This is performed with the casting hose 18 positioned. Next, the casting hose 18 is moved to the upper part of the other space, and concrete 19 is charged. At this time, the vibrator 20 is inserted into the one space, and the poured concrete 19 is stirred. The difference between the filling levels of the concrete 19 in the spaces on the left and right sides is equalized. Thus, between the left and right spaces, the placing of the concrete 19 by the casting hose 18 and the stirring of the placing concrete by the vibrator 20 are alternately repeated, and the concrete placing operation is advanced. This work is performed by an operator visually monitoring the state of the filling level of the concrete 19 inside the steel pipe 14 from above the steel pipe 14. Conventional steel central axial force member 15
In the above, the buckling phenomenon of the steel central axial force member (at the center) was not particularly accompanied by the production, and the quality and performance of the product were secured.

[0004]

However, in order to construct a large building, a conventional buckling restraint bracing member having a length of about 7 to 8 m, for example, 10 m or 20 m, is required. There are needs that require. If the buckling restraint bracing member becomes long, the steel central axial force member 15 is likely to deform and buckle when standing. Furthermore, when concrete is poured into the steel pipe 14 by the above-mentioned concrete casting method, it is difficult to monitor the difference in the concrete filling level between the left and right spaces of the steel central axial force member 15 due to the long member length. Become. As a result, the difference between the concrete filling levels increases, which causes deformation and buckling of the steel central axial force member 15. Also, a steel central axial force member 1
5 or the deformation of the steel pipe 14 when it is erected, increases the difference in the cross-sectional area of the space on the left and right sides of the steel central axial force member 15, thereby contributing to an increase in the difference in concrete filling level, and Uniform filling is prevented, and deformation and buckling of the steel central axial force member 15 are further caused.
In the conventional buckling-restraining bracing method, the shape of a long plate-shaped central axial force member (core material) is secured in a plane in the axial force direction, and the quality of the buckling-restraining bracing member is guaranteed. There is a problem that it is difficult to do this.

In the above description, the steel pipe 14 and the concrete 1 are used as members for restraining the buckling of the steel central axial force member 15.
The case of the concrete member 13 for buckling restraint, in which the composite member 9 and the composite member 9 are integrated, has been described. In addition to the above, in the related art, as a member for restraining the buckling of the steel central axial force member 15, as shown in FIG. 5B, only the steel pipe 14 is used without reinforcing with concrete. is there. in this case,
There is a problem that not only the steel pipe 14 but also the steel central axial force member 15 is deformed, and it is difficult to guarantee the performance and quality of the buckling restraint bracing member.

The present invention advantageously solves the above-mentioned problems of the conventional buckling restraint bracing member, and is excellent in rigidity, proof stress, energy absorption ability, and excellent in accuracy and quality as a buckling restraining bracing member. It is an object of the present invention to provide a flexure restraining bracing member and a method for manufacturing the same.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a buckling-restraining bracing member of the present invention has a plate-like center for hysterically damping seismic motion by yield plastic behavior. To the axial force member, a metal pipe having a buckling resistance greater than the yielding axial force of the plate-shaped central axial force member, and at two or more places in the axial force direction from two plate surfaces of the plate-shaped central axial force member, Holding the plate-shaped central axial force member, erected on the inner wall of the metal tube, or by inserting a buckling restraint member having a holding member disposed through the metal tube wall, The buckling wavelength of the plate-shaped central axial force member is controlled so that the shape of the plate-shaped central axial force member can be held in a planar shape. Here, the plate-shaped central axial force member is installed in a state inserted into the buckling restraint member, and is integrated with the buckle restraint member,
Earthquake motion is hysterically damped by yield plastic behavior. The plate-shaped central axial force member is made of steel. In this case, the buckling restraining member has a metal tube and a holding member. A square tube or a circular tube is used as the metal tube. The material of the metal tube of the present invention may be selected from ordinary steel, stainless steel, copper alloy, aluminum alloy and the like according to the required characteristics. For example, when corrosion resistance is required, stainless steel or copper alloy is used, and when weight reduction is required, aluminum alloy is used. The holding member erects or penetrates the metal tube wall, and holds the plate-shaped central axial force member at a plurality of positions in the axial force direction on the two plate surfaces of the plate-shaped central axial force member. The shape of the axial force member is kept flat, and buckling of the plate-shaped central axial force member is prevented.

The buckling-restraining bracing member of the present invention is capable of inserting a metal pipe into a plate-shaped central axial force member that hysterically attenuates seismic motion by yielding plastic behavior, and inserts the plate-shaped central axial force member into the metal pipe. And concrete cast in
In the concrete, at the time of placing the concrete, the plate-shaped central axial force member is held in a plane at a plurality of locations in the axial force direction from two plate surfaces of the plate-shaped central axial force member. A buckling restraint member having a trace of a holding member disposed through the metal tube wall or a holding member that can be identified by a cavity from which the holding member is extracted or a filler that closes the cavity is attached. It is configured by being inserted through the prevention coating. In this case, the buckling restraining member has concrete and is integrally combined with the metal pipe to restrain the buckling of the plate-shaped central axial force member. After the concrete is cast, the holding member may be left penetrating the metal tube wall, or may be cut and removed from a portion exposed to the outside of the metal tube wall. After the concrete is cast, the holding member finishes its role and can be pulled out. Although a cavity is generated by extracting the holding member, the cavity may be closed by a filler (concrete or the like). In this case, a trace of the mounting of the holding member remains. As the anti-adhesion coating, there are asphalt, rubber, acrylic resin, and the like, and it is preferable that the anti-adhesion coating is previously applied to the plate-shaped central axial force member before placing concrete.

When the holding member is provided so as to penetrate the metal tube, a hole for holding member is provided in the metal tube of the buckling restraining member. The holding member charging holes may be arranged at the same axial force direction position so as to form a pair on the two plate surfaces of the plate-shaped central axial force member. ,preferable.

[0010] A hole for confirming concrete filling can be provided on the two plate surfaces of the plate-shaped central axial force member of the metal tube. The concrete filling confirmation holes are arranged at the same axial force direction position so as to form a pair on the two plate surface sides, and the interval in the axial force direction is the plate surface of the plate-shaped central axial force member. It is preferable to monitor the difference in concrete filling level when concrete is poured into spaces on both sides of the concrete. Here, the following is recommended as the monitoring length a of the filling level difference. Given a filling level difference b, a width w of the plate-shaped central axial force member, and a specific gravity γ of concrete, the force P acting on the plate-shaped central axial force member due to the concrete filling level difference b is P = (1/2) the w × b deflection [delta] when the force P is exerted as the concentrated load at the center of the length L of the plate-like central axis force member, the Young's modulus E, the second moment and I, δ = (PL ³ ) / 48EI where the allowable deflection [delta] _a, When 1/2000 of the length L of the plate-like central axis force member, it is possible to determine the monitoring length a of the filling level difference calculated back. The concrete supply to the spaces on both sides of the plate surface of the plate-shaped central axial force member is controlled so that the filling level difference b falls within the monitoring length a.

The method for manufacturing a buckling-restraining bracing member according to the present invention is a method for covering a metal tube of a buckling-restraining member and an anti-adhesion coating on a plate surface to yield seismic motion inserted into the metal tube. A plate-shaped central axial force member that hysterically attenuates by plastic behavior, is erected in the vertical direction, and while maintaining the shape of the plate-shaped central axial force member in a vertical plane, The press-fitting of concrete is started separately from the lower end of the buckling restraining member into the space on both plate surfaces of the axial force member, and the axial force direction is applied to the two plate surfaces of the plate-shaped central axial force member of the metal pipe. The concrete filling level is monitored by the concrete filling confirmation hole provided along the space, and the concrete is poured into the space.
The plate-shaped central axial force member is held in a planar shape by the holding member inserted through the holding member insertion hole, but a weight is suspended below the plate-shaped central axial force member, and the plate-shaped central axial force member is planarized by its own weight. May be held. When holding the plate-shaped central axial force member in a planar shape by the holding member, the length of charging the holding member into the metal tube is
It is determined according to the amount of horizontal displacement of the side surface of the metal tube. The loading of the holding member is preferably performed by a screw mechanism when adjusting the loading length or extracting the holding member.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of a buckling restraint bracing member according to the present invention. FIG. 1 shows a steel tube 2 a of a buckling restraining member 2 and a plate-shaped central axial force member 3, which are steel portions of a buckling restraining bracing member 1.
In this example, a square rectangular steel pipe is used as the steel pipe 2a of the buckling restraining member 2. The steel pipe 2a has a holding member charging hole 5 and a concrete filling confirmation hole 6 along the axial force direction (pipe axis direction).
Is provided. The plate-shaped central axial force member 3 has a reinforcing rib plate 21 at an end thereof, and a portion of the plate-shaped central axial force member 3 which comes into contact with concrete is coated with an anti-adhesion coating 8 in advance. (B)). FIG. 2 (a) shows A-A of FIG. 1 (a) when concrete 2b is filled in the steel pipe 2a of FIG.
It is sectional drawing of the part corresponding to A. In FIG. 2A, the holding member charging hole 5 and the concrete filling confirmation hole 6 are shown.
The holding member 4 is inserted into the holding member insertion hole 5. FIG. 2A shows two sets of holding members 4 which are paired on both sides of the plate surface of the plate-shaped central axial force member 3 and are inserted at positions facing each other. FIG. 2B shows a case where the loading of the holding member 4 is performed by the screw mechanism 7, and the screw mechanism 7 includes a nut 7a. According to the screw mechanism, it is possible to easily adjust and fix the charging length. Fig. 2 (b)
, A pair of holding members 4 are inserted into opposite sides of the plate-shaped central axial force member 3 in pairs. After the concrete is filled in the steel pipe 2a, the holding member 4 is left as it is, or cuts or extracts the exposed portion outside the steel pipe 2a. In the case of extraction, the later cavity can be filled with concrete or the like.

When manufacturing the above-mentioned buckling restraint bracing member, the steel pipe 2a of the buckling restraining member 2 and the anti-adhesion coating 8 are covered, and the plate-shaped central axial force inserted into the steel pipe 2a is used. The member 3 is erected in the vertical direction, and the horizontal displacement of the side surface of the steel pipe 2a is measured. At this time, the plate-shaped central axial force member 3 is aligned at both ends of the steel pipe 2a, and both are fixed, but a jig 17 of the related art may be used. FIG. 3 shows the amount of displacement in the horizontal direction (the line of the arrow at the left and right ends) at the insertion site of the holding member 4 on the side surface of the steel pipe 2a. The steel pipe 2a to be inserted into the steel pipe 2a in order to hold the plate-shaped central axial force member 3 in a vertical plane according to the displacement amount.
Of the holding member 4 from the side surface (x in the drawing) is determined. FIG. 4 shows an operation for measuring the amount of displacement of the steel pipe 2a in the horizontal direction. On the upper part of the steel pipe 2a, fix the swing 9 with a magnet,
The weight 10 is hung with a thread and measured with a steel ruler 11. A scaffold 12 is provided for the worker. Such a measurement is performed for each side surface of the steel pipe 2a.

Next, the shape of the plate-shaped central axial force member 3 is held in a vertical plane, and the buckling restraint is separately carried out into the space on both plate surfaces of the plate-shaped central axial force member 3 in the steel pipe 2a. Pressing of concrete is started from a concrete feeding port (not shown) at the lower end of the member. During the concrete placement, the concrete filling level is monitored by the concrete filling confirmation holes 6 to monitor the difference in the concrete filling level into the space on both side surfaces, and the concrete feeding is adjusted so as not to exceed a certain filling level difference. Perform casting.

FIG. 5 (a) shows another embodiment of the buckling restraint bracing member of the present invention. In the buckling restraint bracing member 1 of FIG. 5 (a), the buckling restraining member 2 is formed only of the steel pipe 2a and does not use concrete. The buckling restraint bracing member 1 has a plate-shaped central axial force member 3 inserted in a square square steel pipe 2a along a square diagonal line. The steel pipe 2a has a holding member insertion hole 5 along the axial force direction (tube axis direction), and the holding member 4 is inserted. In the present embodiment, the steel pipe 2a is provided at both ends in the width direction of the plate-shaped central axial force member 3.
, A gap is provided. This gap is formed between the inner peripheral surface of the steel pipe 2a deformed (displaced) when the steel pipe 2a is erected when the plate-shaped central axial force member 3 is to be held in a vertical plane by the holding member 4. It must be large enough to prevent the central axial force member 3 from interfering with contact and securing and holding a planar shape. When the buckling restraint bracing member 1 is attached to a building, the holding member
a, and the plate-shaped central axial force member 3 are integrally formed so that the plate-shaped central axial force member 3 does not deform and has rigidity and strength.

[0016]

EXAMPLE A buckling restraint bracing member 1 shown in FIGS. 1 and 2 was carried out. In the buckling restraint bracing member 1, the steel pipe 2a of the buckling restraining member 2 has a rectangular shape of 800 mm × 650 mm.
mm, a square steel pipe having a length of 20 m.
A plate-shaped central axial force member 3 having a width of 700 mm, a thickness of 40 mm, and a length of 22 m is inserted. The side face of the steel pipe 2a is provided with a holding member insertion hole 5 having a diameter of 22 mm at a pitch of 1800 mm in the axial force direction, and a concrete filling confirmation hole 6 having a diameter of 22 mm at a pitch of 600 mm. With the buckling restraining member 2 and the plate-shaped central axial force member 3 covered with the adhesion preventing coating 8 (in this example, asphalt), the round steel holding member 4 having a diameter 22 is mounted. The concrete was poured while monitoring the difference in concrete filling level within 600 mm. As a result, the maximum deflection of the plate-shaped central axial force member 3 was about 5 mm, which was within 1/2000 of that of the plate-shaped central axial force member 3 having a length of 22 m.

The buckling restraint bracing member 1 shown in FIG. 5 was carried out. In the buckling restraint bracing member 1, the steel pipe 2a of the buckling restraining member 2 has a square shape of 650 mm × 650 m.
The plate-shaped central axial force member 3 having a width of 550 mm, a thickness of 36 mm, and a length of 22 m is inserted into the steel pipe 2a. The side face of the steel pipe 2a is provided with a holding member insertion hole 5 having a diameter of 22 mm at a pitch of 1800 mm in the axial force direction, and a concrete filling confirmation hole 6 having a diameter of 22 mm at a pitch of 600 mm. As a result, the maximum deflection of the plate-shaped central axial force member 3 is about 5 mm, and the length is 22 mm.
With respect to the plate-shaped central axial force member 3 of m, it could be accommodated within 1/2000. Although the above embodiments have been described with reference to steel pipes, stainless steel pipes and copper pipes can be used when corrosion resistance is required, and aluminum pipes are used when weight reduction is required.

[0018]

(1) According to the present invention, when the buckling restraining member is composed of a steel pipe and a holding member (claim 1), the steel pipe is elongated when the buckling restraining bracing member is manufactured. , The shape of the plate-shaped central axial force member can be held flat by the holding member regardless of the deformation. Further, when the shape of the plate-shaped central axial force member is held in a planar shape by the holding member at the time of manufacturing the buckling restraint bracing member, when the buckling restraining bracing member is attached to the building thereafter, the holding member is However, the buckling restraint bracing member functions to enhance the rigidity and strength of the buckling restraining bracing member, so that the buckling restraining bracing member (plate-shaped central axial force member) may be deformed and hinder the use as a bracing member. Absent. The buckling restraint bracing member of the present invention can sufficiently guarantee the quality and accuracy in shape, dimensions, and the like even for long-length products. (2) According to the present invention, when the buckling restraining member is made of a steel pipe, a holding member, and concrete (claim 2), the steel pipe is long and has an axial force when the buckling restraining bracing member is manufactured. Even if it is deformed in the direction, the shape of the plate-shaped central axial force member can be positioned in a plane by the holding member, and the shape can be maintained during concrete casting, regardless of the deformation. Further, after the concrete is cast, it can be confirmed from the loaded state of the holding member that the shape of the plate-shaped central axial force member is maintained in the original plane state. Further, when the shape of the plate-shaped central axial force member is held in a planar shape by the holding member at the time of manufacturing the buckling restraint bracing member, thereafter, when attaching the buckling restraining bracing member to the building, a steel pipe, Since concrete (and holding member if left) functions as a unitary member,
The buckling restraint bracing member (plate-shaped central axial force member) does not hinder use due to deformation. This is the same when the holding member is pulled out after the concrete is cast. The buckling-restraining bracing member of the present invention can guarantee sufficient quality and accuracy in shape, dimensions, and the like even for long-length products. (3) The buckling restraint bracing member of the present invention has a holding member insertion hole in a steel pipe, and the holding member is inserted into the holding member insertion hole, regardless of the degree of deformation of the steel pipe. The shape of the plate-shaped central axial force member can be reliably held in a planar shape. Also,
The buckling-restraining bracing member of the present invention, when having a concrete filling confirmation hole in a steel pipe, monitors the difference between the concrete filling levels on both sides of the concrete plate-shaped central axial force member during concrete placement. It is possible to easily prevent the plate-shaped central axial force member, which is held in a flat shape before the concrete is poured, from being deformed by the concrete, and is not deformed.

[Brief description of the drawings]

FIG. 1 shows an example of a form of a buckling restraint bracing member of the present invention. 1A is a front view, and FIG. 1B is a side view.

FIG. 2A is a cross-sectional view of a portion corresponding to AA in FIG. 1A. (B) is a figure which shows the state which inserted the holding member in the steel pipe.

FIG. 3 is a view showing a displacement amount of a steel pipe of a buckling restraint bracing member of the present invention.

FIG. 4 is a diagram illustrating measurement of a displacement amount of a steel pipe of a buckling restraint bracing member.

FIG. 5 shows another example of the buckling restraint bracing member of the present invention.

6 (a) is a view showing a conventional buckling restraint bracing member, and FIG. 6 (b) is a sectional view taken along line AA of FIG. 6 (a).

FIG. 6 is a diagram illustrating fixing of a plate-shaped central axial force member to a steel pipe at the time of manufacturing a buckling-restraining bracing member.

FIG. 8 is a diagram showing a case in which concrete is poured from above a steel pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Buckling restraint bracing member 2 Buckling restraining member 2a Steel pipe 2b Concrete 3 Plate-shaped central axial force member 4 Holding member 5 Holding member insertion hole 6 Concrete filling confirmation hole 7 Screw mechanism 7a Nut 8 Anti-adhesion coating 9 DESCRIPTION OF SYMBOLS 10 Weight 11 Steel measure 12 Scaffolding 13 Concrete member for buckling restraint 14 Steel pipe 15 Steel central axial force member 16 Anti-adhesion coating 17 Jig 18 Casting hose 19 Concrete 20 Vibrator 21 Reinforcing rib plate

 ────────────────────────────────────────────────── ─── Continued on front page (72) Inventor Katsuhito Nakamura 2-6-3 Otemachi, Chiyoda-ku, Tokyo F-term in Nippon Steel Corporation (reference) 2E125 AA04 AA14 AA33 AB16 AC01 AC14 AC16 AG03 AG12 BE10 CA05

Claims (10)

[Claims] A metal tube having a buckling resistance greater than a yielding axial force of the plate-shaped central axial force member; a plate-shaped central axial force; From two plate sides of the member, at a plurality of locations in the axial force direction,
Holding the plate-shaped central axial force member, erected on the inner wall of the metal tube, or by inserting a buckling restraint member having a holding member disposed through the metal tube wall, A buckling restraint bracing member characterized in that the buckling wavelength of the plate-shaped central axial force member is controlled so that the shape of the plate-shaped central axial force member can be held in a planar shape. 2. A metal plate having a plate-shaped central axial force member for hysteresis-damping seismic motion by yielding plastic behavior, and a concrete cast inside the metal tube so that the plate-shaped central axial force member can be inserted therethrough. Further, when the concrete is poured into the concrete, the plate-shaped central axial force member is planarized at a plurality of positions in the axial force direction from two plate surfaces of the plate-shaped central axial force member. A buckling restraint having a trace of a holding member to be held, the holding member disposed through the metal tube wall, or a holding member that can be identified by a cavity from which the holding member is extracted or a filler that closes the cavity. A buckling-restraining bracing member, wherein the member is inserted through an adhesion preventing coating. 3. The buckling restraint bracing member according to claim 2, wherein the metal pipe of the buckling restraining member has a holding member insertion hole. 4. The holding member insertion holes on the two plate surfaces of the plate-shaped central axial force member are disposed so as to form a pair on the two plate surfaces at the same axial force position. The buckling-restraining bracing member according to claim 3, wherein the member is formed. 5. The concrete tube according to claim 2, wherein said metal tube of said buckling restraining member has holes for confirming concrete filling on two plate surfaces of said plate-shaped central axial force member.
The buckling-restraining bracing member according to any one of the above items. 6. The concrete filling confirmation holes on each of two plate surfaces of the plate-shaped central axial force member are arranged so as to form a pair on the two plate surfaces at the same axial force direction position. The distance between the concrete filling confirmation holes in the axial force direction is determined by the filling of the concrete on both sides when the concrete is poured into the space on both plate surfaces of the plate-shaped central axial force member in the buckling restraint member. 6. The monitoring length of the level difference.
A buckling-restraining bracing member according to item 1. 7. A plate-shaped central axial force member for covering a metal tube of a buckling restraining member and an anti-adhesion coating on a plate surface and hysterically attenuating seismic motion by yielding plastic behavior inserted in the metal tube. Standing vertically in the vertical direction, and while maintaining the shape of the plate-shaped central axial force member in a vertical plane, separately into the space on the both plate surface sides of the plate-shaped central axial force member in the metal pipe. The press-fitting of concrete starts from the lower end of the buckling restraint member, and the concrete filling confirmation hole provided along the axial force direction on the two plate surfaces of the plate-shaped central axial force member of the metal tube. A method for manufacturing a buckling-restrained bracing member, comprising monitoring concrete filling level differences between spaces on both plate surfaces and placing concrete. 8. A holding member is inserted into the metal tube wall on two plate surfaces of the plate-shaped central axial force member through holding member insertion holes provided at a plurality of positions in an axial force direction; The method for manufacturing a buckling restraint bracing member according to claim 7, wherein the plate-shaped central axial force member is held in a planar shape by the holding member. 9. The buckling restraint strut according to claim 8, wherein a length of the holding member inserted into the metal tube is determined according to a horizontal displacement of a side surface of the metal tube. Manufacturing method of the member. 10. The method for manufacturing a buckling restraint bracing member according to claim 8, wherein the mounting of the holding member through the holding member mounting hole is performed by a screw mechanism. .