JP2021042636A - Buckling restraint building material and manufacturing method of the same - Google Patents

Abstract

To reassure a predefined gap between a core material and a core material opposite surfaces of two buckling restraint members with high accuracy in low cost.SOLUTION: The buckling restraint building material 10 clipping a core material 2 with two buckling restraint members 1, 1 interposes a gap holding member 18 for reassuring a predefined gap Δt between the core material 2 and core material opposite surfaces 3d, 3d of the two buckling restraint members 1, 1 between the two buckling restraint members 1, 1 of a longitudinal lateral side of the core material 2.SELECTED DRAWING: Figure 4

Description

The present invention is a buckling restraint building material such as a buckling restraint brace, which is incorporated between layers of a main frame of a structure and absorbs energy by plastically deforming when interlayer deformation occurs to suppress damage to the structure. It also relates to a method for manufacturing a buckling restraint building material.

As a buckling restraint building material of this kind, a buckling restraint brace formed by sandwiching a core material between two buckling restraint members is conventionally known. For example, in Patent Document 1, two buckling restraining members made of steel plate filled with concrete sandwich a core material made of steel, and the frame plates of the two buckling restraining members are welded to each other. The buckling restraint brace manufactured in the above is disclosed. In this buckling restraint brace, a notch is provided in the intermediate portion of the plate-shaped core material in the longitudinal direction to form a narrow portion, and the width of the intermediate portion is appropriately set to adjust the yield strength and the axial rigidity. It is possible. Further, in the space created by this notch, a spacer is arranged to prevent the intermediate portion from moving in the width direction when a load is applied.

Japanese Patent No. 4665232

In a buckling restraint building material such as a buckling restraint brace, a load that compresses the core material in the longitudinal direction may be applied. By exerting an appropriate restoring force without buckling of the core material under such a load, the buckling restraint building material can also function as a seismic-resistant member / vibration-damping member.

In order for the buckling restraint building material to function as a seismic member / vibration damping member in this way, a predetermined amount of gap is ensured with high accuracy between the core material and the facing surfaces of the core materials of the two buckling restraint members. Is important. Specifically, if this gap is too wide, the core material will be in the opposite direction of the two buckling restraint members (the direction orthogonal to the longitudinal direction of the core material and the two buckling restraints when the core material is compressed in the axial direction). In the direction in which the members face each other), plastic deformation occurs locally. On the contrary, if this gap is too narrow, the core material is restricted by the two buckling restraint members and cannot be sufficiently deformed in the opposite direction of the two buckling restraint members when the core material is compressed in the axial direction. In this case, the compressive axial force of the core material flows to the buckling restraint member.

As a method of securing the gap, a method of sandwiching a sandwiched member such as rubber between the core material and the facing surfaces of the core materials of the two buckling restraint members and merging them is conceivable. However, in this method, when the core material and the sandwiched member are sandwiched between the two buckling restraint members at the time of merging, the thickness of the sandwiched member after the sandwiched member is deformed by the sandwiching is increased. Unless it is controlled with precision, a predetermined amount of gap cannot be secured. In addition, after merging, the sandwiched member interposed between the core material and the facing surfaces of the two buckling restraint members does not hinder the deformation of the core material under the axial compressive load of the core material. Must be able to demonstrate the characteristics. As described above, since the above-mentioned method requires an sandwiched member that satisfies these conditions, it is very costly and it is very difficult to secure a predetermined amount of gaps with high accuracy.

In order to solve the above-mentioned problems, the present invention is a buckling restraint building material in which a core material is sandwiched between two buckling restraint members, and the core material and the core material facing surfaces of the two buckling restraint members. A gap holding member for securing a predetermined amount of gap between the two is interposed between the two buckling restraining members on the side in the longitudinal direction of the core material.
According to the present invention, by interposing a gap holding member arranged laterally in the longitudinal direction of the core material between the two buckling restraint members, the core material and the two buckling restraint members face each other with the core material facing surfaces. A predetermined amount of gap is secured between the two. As a result, the core material and the two buckling restraint members face each other without arranging a special member such as a sandwiched member between the core material and the two buckling restraint members facing each other. A predetermined amount of gap can be secured between the surface and the surface.
Further, since the gap holding member of the present invention is arranged laterally in the longitudinal direction of the core material, the core material is deformed when the core material is subjected to an axial compressive load (deformation of the two buckling restraint members in the opposite direction). As long as the gap can be secured, the material is not particularly limited. Therefore, an inexpensive gap holding member can be used, and cost reduction can be realized.

Further, in the present invention, in the buckling restraint building material, the core material has a cross section orthogonal to the longitudinal direction of the core material, and the length of the two buckling restraint members in the opposite direction is the buckling of the two. The shape is shorter than the length in the direction orthogonal to the facing direction of the restraint member.
According to the present invention, when an axial compressive load of the core material is applied, the core material can be deformed preferentially in the opposite direction of the two buckling restraint members rather than in the direction orthogonal to the opposite direction. , Deformation and buckling of the core material can be appropriately suppressed and restrained by the two buckling restraining members.

Further, in the present invention, in the buckling restraint building material, a displacement suppressing member for suppressing the lateral displacement of the core material is arranged on the side in the longitudinal direction of the core material, and the gap holding member is , The displacement suppressing member is included.
By arranging the displacement suppressing member laterally in the longitudinal direction of the core material and suppressing the lateral displacement of the core material, the buckling restraining member is opposed to the opposite direction at the time of the axial compressive load of the core material. Deformation and buckling of the core material in the directions orthogonal to each other can be appropriately suppressed and restrained by the displacement suppressing member. According to the present invention, since the gap holding member can be obtained by using this displacement suppressing member, the configuration can be simplified, the weight can be reduced, etc., as compared with the case where the gap holding member is provided separately from the displacement suppressing member. It becomes possible to plan.

Further, in the buckling restraint building material, the present invention relates to the core material on the longitudinal side of the core material between the side surface of the core material and the side facing surfaces of the two buckling restraint members. A gap adjusting member for adjusting the lateral gap is arranged, and the gap holding member includes the gap adjusting member.
By arranging a gap adjusting member on the side in the longitudinal direction of the core material and adjusting the side gap of the core material between the side surface of the core material and the side facing surfaces of the two buckling restraint members on the side of the core material, the core Deformation and buckling of the core material in the direction orthogonal to the facing direction of the two buckling restraint members are appropriately suppressed by the side facing surfaces of the core materials of the two buckling restraint members when the material is subjected to an axial compressive load. , Can be restrained. According to the present invention, since the gap holding member can be obtained by using this gap adjusting member, the configuration can be simplified, the weight can be reduced, etc., as compared with the case where the gap holding member is provided separately from the gap adjusting member. It becomes possible to plan.

Further, according to the present invention, in the buckling restraint building material, the gap holding member is the displacement suppressing member or the gap adjusting member, and at least one of the two buckling restraint members facing the gap holding member. It is characterized in that it is composed of a displacement suppressing member or a gap adjusting material interposed between the displacement suppressing member and the gap adjusting member.
According to the present invention, a gap holding member can be obtained only by adding a gap adjusting material to an existing displacement suppressing member or gap adjusting member.

Further, the present invention is characterized in that, in the buckling restraint building material, the gap holding member has a fixing means for fixing the gap adjusting material to the displacement suppressing member or the gap adjusting member.
If the gap adjusting material is not fixed to the displacement suppressing member or the gap adjusting member, the gap adjusting material may move due to vibration during use. In this case, for example, the moved gap adjusting material may enter the gap between the core material and the facing surfaces of the two buckling restraint members, or the side surface of the core material and the core of the two buckling restraint members. If it gets into the side gap of the core material between it and the side facing surface of the material, it hinders proper deformation of the core material and causes a problem that the original function cannot be exhibited.
According to the present invention, since the gap adjusting material is fixed to the displacement suppressing member or the gap adjusting member by the fixing means, the gap adjusting material does not move due to vibration during use, and the above-mentioned problems are prevented from occurring. it can.

Further, the present invention is characterized in that, in the buckling restraint building material, the gap adjusting material is a low-strength member having a lower strength than the core material.
According to the present invention, the gap adjusting material may enter the gap between the core material and the facing surfaces of the core materials of the two buckling restraining members due to vibration during use, or the side surface of the core material and the two bucklings. Even if the restraint member gets into the side gap of the core material between the side facing surface of the core material, the gap adjusting material is a low-strength member with lower strength than the core material, so the core material is appropriate. It is difficult to inhibit deformation, and it is possible to suppress the occurrence of a problem that the original function cannot be exhibited. Moreover, since it is not necessary to provide the fixing means described above, the configuration is simple.

Further, the present invention is characterized in that, in the buckling restraint building material, the buckling restraint member is a frame plate filled with concrete or mortar.
According to the present invention, a relatively lightweight and high-performance buckling restraint building material can be realized.

Further, in the buckling restraint building material of the present invention, in the two buckling restraint members, the gap holding member facing surface facing the gap holding member is smoothed, and the core material facing surface is smoothed. It is characterized by not having.
In the conventional method of sandwiching and merging a sandwiched member such as rubber between the core material and the core material facing surfaces of the two buckling restraint members, the entire core material facing surface facing the core material is smoothed over a wide range. It was necessary to perform the treatment to improve the accuracy of the gap to be secured between the core material and the facing surfaces of the core materials of the two buckling restraint members.
According to the present invention, in order to improve the accuracy of the gap to be secured, if the smoothing treatment is performed only in a relatively narrow range of the gap holding member facing surface facing the gap holding member arranged on the side in the longitudinal direction of the core material. Therefore, the work load of the smoothing process can be reduced.

Further, the present invention is a method for manufacturing a buckling restraint building material in which a core material is sandwiched between two buckling restraint members, and is located between the core material and the surface facing the core material of the two buckling restraint members. A step of interposing a gap holding member for securing a fixed amount of gap between the two buckling restraint members on the longitudinal side of the core material, and a step of fixing the two buckling restraint members to each other. It is characterized by having.
According to the present invention, by interposing a gap holding member arranged laterally in the longitudinal direction of the core material between the two buckling restraint members, the core material and the two buckling restraint members face each other with the core material facing surfaces. A predetermined amount of gap is secured between the two. As a result, the core material and the two buckling restraint members face each other without arranging a special member such as a sandwiched member between the core material and the two buckling restraint members facing each other. A predetermined amount of gap can be secured between the surface and the surface.
Further, since the gap holding member of the present invention is arranged laterally in the longitudinal direction of the core material, the core material is deformed when the core material is subjected to an axial compressive load (deformation of the two buckling restraint members in the opposite direction). As long as the gap can be secured, the material is not particularly limited. Therefore, an inexpensive gap holding member can be used, and cost reduction can be realized.

Further, the present invention is characterized in that the manufacturing method includes a step of removing the gap holding member.
In the present invention, by fixing the two buckling restraint members to each other, the gap between the core material and the facing surface of the core material of the two buckling restraint members is fixed, so that there is no gap holding member thereafter. However, a predetermined amount of gap obtained by the gap holding member is maintained. According to the present invention, since the step of removing the gap holding member is provided, the gap holding member is not left in the buckling restraint building material, and the core material and the two core material facing surfaces of the buckling restraint member are separated from each other. It is possible to obtain a buckling restraint building material in which a predetermined amount of gap is secured. As a result, it is possible to prevent the buckling restraint building material from moving due to vibration during use, and to prevent the occurrence of problems such as hindering proper deformation of the core material.

According to the present invention, a predetermined amount of gap can be secured with high accuracy between the core material and the facing surfaces of the core materials of the two buckling restraint members at low cost.

The perspective view of the buckling restraint brace in embodiment. An exploded perspective view of the buckling restraint brace. A vertical cross-sectional view showing the internal structure of the buckling restraint brace. The cross-sectional view which shows the internal structure of the buckling restraint brace. The plan view which shows the core material and the spacer which make up the buckling restraint brace. The side view which shows the core material which comprises the buckling restraint brace. Vertical cross-sectional view of one end side of the buckling restraint brace. An exploded perspective view of a buckling restraint brace in a modified example. The cross-sectional view which shows the internal structure of the buckling restraint brace. The cross-sectional view which shows another example of the gap holding member in the buckling restraint brace. The cross-sectional view which shows the internal structure of one end side of a buckling restraint brace in a further modification. The cross-sectional view which shows another example of the gap holding member in the buckling restraint brace.

Hereinafter, an embodiment in which the present invention is applied to a buckling restraint brace as a buckling restraint building material will be described.
The buckling restraint building material according to the present invention can be used not only as a brace (bracing) but also as a beam, a column, a base, etc., and the buckling restraint brace of the present embodiment described below can be used. Can also be used for beams, columns, foundations, etc.

FIG. 1 is a perspective view of a buckling restraint brace in the present embodiment.
FIG. 2 is an exploded perspective view of the buckling restraint brace in the present embodiment.
FIG. 3 is a vertical cross-sectional view showing the internal structure of the buckling restraint brace in the present embodiment.
FIG. 4 is a cross-sectional view showing the internal structure of the buckling restraint brace in the present embodiment.

The buckling restraint brace 10 of the present embodiment is composed of a core material 2 made of a steel plate and two buckling restraint members 1 and 1 sandwiching the core material 2. The two buckling restraint members 1 and 1 have the same structure. The buckling restraint members 1 and 1 in the present embodiment are frame plates 4 and 4 filled with concrete or mortar (in the following description, an example using mortar) 3 and 3.

The core material 2 of the present embodiment has a flat plate shape, and more specifically, in a cross section (cross section shown in FIG. 4) orthogonal to the longitudinal direction of the core material 2, the two buckling restraint members 1 and 1 are opposed to each other. The shape is shorter than the length in the direction (vertical direction in FIG. 4) perpendicular to the opposite direction of the two buckling restraint members 1 and 1 (horizontal direction in FIG. 4). The cross-sectional shape of the core material 2 is not limited to this, and may be, for example, a circular shape, an elliptical shape, a cross shape, or the like.

As shown in FIGS. 5 and 6, the core material 2 of the present embodiment has a single plate structure of a steel plate including a flat plate-shaped core material intermediate portion 6 and connecting portions 8 and 8 provided at both ends thereof. .. The connecting portions 8 and 8 may be formed by adhering a reinforcing plate for reinforcement to the upper and lower surfaces of a steel plate (base material of the core material 2) extending from the intermediate portion 6 of the core material. By this reinforcing plate, the strength of the connecting portions 8 and 8 is strengthened more than the strength of the core material intermediate portion 6.

Further, ribs 13 and 13 are joined to the connecting portions 8 and 8 of the core material 2, and the cross-sectional shape is configured to be cross-shaped. Further, the connecting portions 8 and 8 are formed with bolt holes 14 for installation, which are used when the buckling restraint brace 10 is installed in a building or the like.

The core material intermediate portion 6 of the core material 2 is formed by forming long notches 16 and 16 in the longitudinal direction of the core material 2 on both side portions of the steel plate forming the base material of the core material 2. The width (length in the vertical direction in FIG. 5) is narrower than the width of the connecting portions 8 and 8. The strength of the core material intermediate portion 6 can be appropriately adjusted by changing the dimensions of the width and the length of the notch portions 16 and 16 in the longitudinal direction. Therefore, the axial rigidity and the yield strength of the core material 2 can be set to desired values by appropriately selecting the dimensions of the cutout portions 16 and 16 of the core material intermediate portion 6.

Further, in the present embodiment, spacers 18a and 18a are arranged in the space (internal space of the cutouts 16 and 16) on the longitudinal side of the core material 2 generated by the cutouts 16 and 16 of the core material intermediate portion 6. Will be done. The spacers 18a and 18a function as displacement suppressing members that suppress displacement of the core material 2 in the longitudinal direction (vertical direction in FIG. 5). That is, when the spacers 18a and 18a are not arranged, the core material intermediate portion 6 of the core material 2 can be displaced until it comes into contact with the inner side wall 19 of the buckling restraint member 1 (that is, by the width of the notch portion 16). However, by arranging the spacers 18a and 18a, the displacement can be made only until they come into contact with the spacers 18a and 18a, and the length side of the core material 2 (core material intermediate portion 6) is equal to the width of the spacers 18a and 18a. Displacement to the direction is suppressed.

By arranging the displacement suppressing members of the spacers 18a and 18a on the longitudinal side of the core material 2, the gap between the core material 2 and the inner side wall 19 of the buckling restraining member 1 (side space of the core material 2). ) Is too wide, the displaceable amount of the core material 2 in the longitudinal direction can be adjusted, and the deformation and buckling of the core material 2 under the axial compressive load of the core material 2 can be appropriately controlled. It becomes. In particular, in the configuration in which the notches 16 and 16 are provided to adjust the strength of the core material intermediate portion 6 as in the present embodiment, the strength of the core material intermediate portion 6 can be increased by arranging the spacers 18a and 18a. It becomes easy to achieve both the optimization and the optimization of the displaceable amount of the core material 2 in the longitudinal direction.

The longitudinal dimensions of the spacers 18a and 18a are set to be slightly smaller than the longitudinal dimensions of the notches 16 and 16. As a result, a gap is formed between the longitudinal end portions of the spacers 18a and 18a and the longitudinal inner end faces of the connecting portions 8 and 8, and the connecting portions 8 and 8 of the core material 2 are subjected to an axial compression load of the core material 2. The inner end faces in the longitudinal direction of the above do not abut on the spacers 18a and 18a. Therefore, even if the spacers 18a and 18a are arranged, the yield strength is not changed. As the spacers 18a and 18a, scraps obtained by cutting the cutouts 16 and 16 may be used, or another member such as a round bar may be used.

The mortar materials 3 and 3 constituting the buckling restraint members 1 and 1 of the present embodiment are mortar blocks manufactured at a place different from the frame plates 4 and 4. As shown in FIGS. 2 and 7, ribs 13 and 13 provided on the connecting portions 8 and 8 of the core material 2 are inserted into the inclined grooves 20 and 20 in both end portions 3b and 3b of the mortar materials 3 and 3. Is provided.

The frame plates 4 and 4 constituting the buckling restraint members 1 and 1 of the present embodiment are formed of steel plates and rise from the bottom surface 4a and both ends in the width direction (horizontal direction in FIG. 4) as shown in FIG. It is composed of elevations 4b and 4c, and is configured so that the cross-sectional shape is U-shaped. As shown in FIG. 4, the heights of the elevations 4b and 4c from the bottom surface 4a are higher in the other elevation 4b than in one elevation 4c.

Further, as shown in FIG. 2, the ribs 13 and 13 provided on the connecting portions 8 and 8 are inserted at both ends of the frame plates 4 and 4 in the longitudinal direction, and the pair of pads 24 and 24 are spaced apart from each other. 24 is provided. Inside each of the frame plates 4 and 4, mortar materials 3 and 3 made of mortar blocks are inserted from the opening side thereof.

Next, a predetermined amount of the core material 2 and the core material facing surface 3d of the two buckling restraint members 1 and 1 (the core material facing surface 3d of the mortar materials 3 and 3), which is a feature portion of the present invention, is provided. A method of securing the gap Δt will be described.
The gap Δt between the core material 2 and the core material facing surfaces 3d of the two buckling restraint members 1 and 1 is set with high accuracy, especially when the main buckling restraint brace 10 functions as a seismic member / vibration damping member. Is required to do. That is, if this gap Δt is too wide, the core material intermediate portion 6 of the core material 2 faces the two buckling restraint members 1 and 1 in the opposite direction (vertical direction in FIG. 4) when the core material 2 is compressed in the axial direction. Will be locally plastically deformed. On the contrary, if this gap Δt is too narrow, the core material 2 is restricted by the two buckling restraint members 1 and 1 when the core material 2 is compressed in the axial direction, and is sufficiently in the opposite direction (vertical direction in FIG. 4). Deformation (distortion) becomes impossible. In this case, the compressive axial force of the core material 2 flows to the buckling restraint members 1 and 1.

As a method of securing this gap Δt, a method of sandwiching and merging a sandwiched member such as rubber between the core material 2 and the core material facing surfaces 3d and 3d of the two buckling restraint members 1 and 1. Conceivable. However, in this method, as described above, when the core material 2 and the sandwiched member are sandwiched between the two buckling restraint members 1 and 1 at the time of merging, the sandwiched member is deformed by the sandwiching. Unless the thickness of the sandwiched member is controlled with high accuracy, a predetermined amount of gap Δt cannot be secured. In addition, after the merging, the sandwiched member interposed between the core material 2 and the core material facing surfaces 3d and 3d of the two buckling restraint members 1 and 1 is subjected to the axial compressive load of the core material 2. It must be able to exhibit properties that do not hinder the deformation (distortion) of the core material 2. As described above, in the above method, since the sandwiched member satisfying these conditions is required, the cost is high and it is very difficult to secure a predetermined amount of the gap Δt with high accuracy. ..

Therefore, in the present embodiment, as shown in FIG. 4, in order to secure a predetermined amount of gap Δt between the core material 2 and the core material facing surfaces 3d of the two buckling restraint members 1 and 1, the core Gap holding members 18 and 18 are provided between the core material facing surfaces 3d and 3d of the two buckling restraint members 1 and 1 on the lateral side in the longitudinal direction of the material 2. In the method of arranging the gap holding members 18 and 18 between the core material facing surfaces 3d and 3d to obtain the gap Δt, the core material 2 and the two buckling restraint members 1 and 1 have the core material facing surfaces. A predetermined amount of gap Δt can be secured without arranging a special member such as a sandwiched member between the 3d and the 3d.

Moreover, as in the present embodiment, by arranging the gap holding member 18 on the side in the longitudinal direction of the core material 2, the gap holding member 18 for securing the gap Δt causes the core material 2 to be compressed in the axial direction. Deformation (distortion) of the core material 2 is not hindered. Therefore, the gap holding member 18 does not need a function that does not hinder the deformation (distortion) of the core material 2 at the time of axial compression load of the core material 2 as long as the function of securing the gap Δt is obtained. A wide and inexpensive gap holding member 18 can be used. For example, relatively inexpensive materials such as wood, plastic materials, and hardened rubber can be used.

Further, the gap holding member 18 of the present embodiment is composed of the spacer 18a described above and a gap adjusting member 18b arranged on the upper and lower surfaces of the spacer 18a. The gap adjusting members 18b and 18b are interposed between the gap holding member facing surfaces 3e and 3e of the buckling restraining members 1 and 1 (the gap holding member facing surfaces 3e and 3e of the mortar material 3) and the upper and lower surfaces of the spacer 18a. Arranged like this. In this way, since the gap holding member 18 can be obtained by using the spacer 18a, it is possible to simplify the configuration, reduce the weight, and the like as compared with the case where the gap holding member is provided separately from the spacer 18a. It will be possible.

It should be noted that the spacer 18a may be used as a thickened gap holding member. That is, a gap holding member of a single member that also functions as the spacer 18a may be used. However, in this case, since it is necessary to function as the spacer 18a, the material choices for the gap holding member are narrowed, and the scraps obtained by cutting the notches 16 and 16 of the core material 2 are used as the spacer 18a. There is a demerit that it becomes impossible to do so and causes an increase in cost.

Further, the gap adjusting material 18b of the present embodiment is preferably a low-strength member having a lower strength than the core material 2. The strength of the gap adjusting material 18b may be such that a desired amount of gap Δt can be secured until the frame plates 4 and 4 are joined by fillet welding 4d in the manufacturing process described later, and the core material 2 It doesn't need to be as strong as it is.

In addition, when the gap adjusting material 18b is not fixed to the spacer 18a as in the present embodiment, or when it is fixed with a weak fixing force, the gap is caused by vibration applied when the buckling restraint brace 10 is used. The adjusting material 18b may move. In this case, for example, the moved gap adjusting material 18b may enter the gap Δt between the core material 2 and the core material facing surfaces 3d and 3d of the two buckling restraint members 1 and 1, or may enter the side surface of the core material 2. If the spacer 18a enters the core material lateral gap ΔW between the spacer 18a and the core material side facing surface, proper deformation of the core material 2 is hindered when the core material 2 is subjected to an axial compressive load, and buckling is restrained. There is a possibility that a problem may occur in which the brace 10 cannot perform its original function. If the gap adjusting material 18b is a low-strength member having a lower strength than the core material 2 as in the present embodiment, even if such penetration occurs, proper deformation of the core material 2 is unlikely to be hindered. It is possible to suppress the occurrence of a problem that the buckling restraint brace 10 cannot perform its original function.

Of course, as the gap adjusting material 18b of the present embodiment, a member having the same strength or higher strength as the core material 2 may be used. However, in this case, it is preferable to provide a fixing means for fixing the gap adjusting material 18b to the spacer 18a so that the above-mentioned gap adjusting material 18b does not enter. This fixing means is not limited to the means for fixing the gap adjusting material 18b to the spacer 18a by adhesion or welding, and for example, the gap adjusting material 18b is displaced in the width direction (left-right direction in FIG. 4) on the spacer 18a. It may be a means by a stopper that regulates.

In the present embodiment, the lower limit of the gap Δt (the gap when the core material 2 is offset to one core material facing surface 3d) is intermediate between the core materials of the core material 2 assuming that the Poisson's ratio is 0.5. Using the plastic strain a with respect to the thickness t in the part 6, it can be expressed by Δt ≧ t × a / 100 × 0.5. As an example, when the thickness t of the core material intermediate portion 6 of the core material 2 is 40 mm and the plastic strain a of the core material 2 is about 3% at the maximum, the lower limit of the gap Δt is about 0.6 mm. As described above, the upper limit of the gap Δt is appropriately set within a range that can prevent the core material intermediate portion 6 of the core material 2 from being locally plastically deformed when the core material 2 is subjected to an axial compressive load. However, since it cannot be set to a very large value, the settable range of the gap Δt is narrow, and highly accurate management of the gap Δt is required.

In the present embodiment, the side surface of the core material intermediate portion 6 of the core material 2 is the same as the gap Δt between the core material intermediate portion 6 of the core material 2 and the core material facing surface 3d of the two buckling restraint members 1 and 1. The gap ΔW between the spacers 18a and 18a (the gap when the core material 2 and the spacers 18a and 18a are offset to one inner side wall 19 of the buckling restraint member 1) is also relatively high, though not as much as the gap Δt. Accuracy is required. For example, in the above example, when the width of the core material intermediate portion 6 of the core material 2 is 400 mm and the plastic strain a of the core material 2 is about 3% at the maximum, the lower limit of the gap ΔW is about 6 mm. Become. As described above, the upper limit of the gap ΔW is also appropriately set within a range that can prevent the core material intermediate portion 6 of the core material 2 from being locally plastically deformed when the core material 2 is subjected to an axial compressive load. However, since it cannot be set to a very large value, the settable range of the gap ΔW is narrow, and the gap ΔW is also required to be managed with appropriate high accuracy.

Next, a method of manufacturing the buckling restraint brace 10 in the present embodiment will be described.
First, the frame plates 4 and 4 are manufactured. Specifically, after the flat plate-shaped steel plate is bent to form the bottom surface 4a and the elevation surfaces 4b and 4c, a pair of pads 24 and 24 made of another steel plate are attached by welding. After that, the mortar materials 3 and 3 made of mortar blocks prepared separately are stored in the frame plates 4 and 4.

Further, a core material 2 produced by processing and welding a steel plate is prepared, and the core material 2 is placed on the mortar material 3 in one frame plate 4. Then, the spacer 18a in a state of being sandwiched between the two gap adjusting members 18b, 18b is arranged in the cutout portions 16, 16 of the core material 2. After that, the remaining frame plates 4 are merged as shown in FIG. 2, and the elevations 4b and 4c between the frame plates 4 and 4 are joined by fillet welding 4d as shown in FIG. As a result, the buckling restraint brace 10 is manufactured.

Here, since the gap holding member facing surfaces 3e and 3e of the buckling restraint members 1 and 1 facing the gap adjusting members 18b and 18b are the surfaces of the mortar materials 3 and 3, the surface becomes rough and smooth as it is. It is chipped and has low flatness. In this case, it is difficult to secure a predetermined amount of gap Δt between the core material 2 and the core material facing surface 3d of the two buckling restraint members 1 and 1 (the core material facing surface 3d of the mortar materials 3 and 3). .. Therefore, in the present embodiment, the gap holding member facing surfaces 3e and 3e of the buckling restraint members 1 and 1 are smoothed. The smoothing treatment is not particularly limited as long as it is a treatment for removing the roughness of the surface and improving the flatness, and may be a polishing treatment or a coating treatment.

On the other hand, since such smoothing treatment is not required for the portions of the core material facing surfaces 3d and 3d facing the core material 2, the core material facing surfaces 3d and 3d of the present embodiment remain rough surfaces. .. Since the portion to be smoothed is only a part of the surfaces of the mortar materials 3 and 3, the work load of the smoothing treatment is reduced.

Moreover, in the conventional method of sandwiching and merging a sandwiched member such as rubber between the core member 2 and the core material facing surfaces 3d and 3d of the two buckling restraint members 1, 1, the sandwiched member is used. In order to secure a fixed amount of gap Δt, it is necessary to perform smoothing treatment on the core material facing surfaces 3d and 3d. Since the gap holding member facing surfaces 3e and 3e, which are the targets of the smoothing treatment in the present embodiment, have a smaller area than the core material facing surfaces 3d and 3d, according to the present embodiment, the smoothing treatment is performed as compared with the conventional method. There is a merit that the burden of the work of performing the work can be reduced.

Further, in the buckling restraint brace 10 of the present embodiment, since the gap adjusting material 18b is for securing a desired amount of gap Δt, the frame plates 4 and 4 are joined by fillet welding 4d to obtain a gap Δt. After being fixed, the clearance adjusting material 18b need not remain in the buckling restraint brace 10. Therefore, after joining the frame plates 4 and 4, a step of removing the gap adjusting material 18b may be performed. If the gap adjusting material 18b is removed in this way, the weight of the buckling restraint brace can be reduced accordingly. Further, if the gap adjusting material 18b is removed, it is possible to reliably prevent the gap adjusting material 18b from entering the gap Δt or the gap ΔW while the buckling restraint brace is being used. Therefore, the gap adjusting material 18b is suitable for the core material 2. It is possible to reliably prevent the occurrence of a problem that the buckling restraint brace 10 cannot perform its original function by hindering such deformation.

However, if there is no problem in leaving the gap adjusting material 18b in the buckling restraint brace 10, the removing step may not be performed in order to simplify the manufacturing process.

[Modification example]
Next, a modified example of the buckling restraint brace 10 in the present embodiment will be described.
FIG. 8 is an exploded perspective view of the buckling restraint brace in this modified example.
FIG. 9 is a cross-sectional view showing the internal structure of the buckling restraint brace in this modified example.
In this modification, the configuration of the buckling restraint brace of the above-described embodiment is simplified to be suitable for practical use.

Specifically, the core material 2 of the present modification is a straight type in which the notches 16 and 16 are not formed (the core material 2 of the above-described embodiment is a squeeze type), and is a rectangular flat plate. It is a simple structure in which ribs 13 and 13 are provided on a shaped steel plate to form connecting portions 8 and 8. Therefore, the manufacturing cost of the core material 2 can be reduced. The structure of the buckling restraint members 1 and 1 is the same as that of the above-described embodiment.

Further, the gap holding members 17 and 17 of this modification are between the core material 2 and the core material facing surface 3d of the two buckling restraint members 1 and 1 (the core material facing surface 3d of the mortar materials 3 and 3). It is a round bar member (round steel) having a circular cross section having a diameter capable of securing a predetermined amount of gap Δt. The gap holding member 18 of the above-described embodiment is composed of a plurality of members of a spacer 18a and a gap adjusting member 18b, but since the gap holding members 17 and 17 of this modified example are composed of a single member, the gap holding member 18 is composed of a plurality of members. The number of assembly steps is small and the manufacturing process can be simplified.

The gap holding members 17 and 17 in this modification are examples of round bar members (round steel) having a circular cross section, but the present invention is not limited to this, and for example, as shown in FIG. It may be a bar member (square steel).

Further, the gap holding members 17 and 17 of this modification are for adjusting the core material lateral gap ΔW between the side surface of the core material 2 and the core material side facing surfaces of the two buckling restraint members 1 and 1. It also functions as a gap adjusting member. Therefore, the gap holding members 17 and 17 are configured to be present on the side of the connecting portions 8 and 8 in the longitudinal direction.

Such a gap adjusting member includes the width of the core material 2 required to realize the function required for the core material 2 and the buckling restraint member 1 required to realize the function required for the buckling restraint member 1. It is used when the gap between the side surface of the core material 2 and the inner side walls 19 and 19 of the buckling restraint members 1 and 1 cannot be set to a desired amount in relation to the width of the core member 2. Since the gap holding member 17 of this modification also functions as such a gap adjusting member, the configuration is simplified, the weight is reduced, and the like as compared with the case where the gap holding member is provided separately from the gap adjusting member. It becomes possible.

Of course, as shown in FIG. 11, the gap holding member 17 of the present modification may also be composed of the gap adjusting member 17a and the gap adjusting member 17b arranged on the upper and lower surfaces of the gap adjusting member 17a. When the gap holding member 17 of this modification is made of a square bar member as shown in FIG. 10, the configuration is as shown in FIG.

The gap holding members 17 and 17 of this modification also function as displacement suppressing members that suppress the displacement of the core material 2 in the longitudinal direction.

The gap adjusting member may be additionally provided in the buckling restraint brace of the above-described embodiment. That is, simply by arranging the spacers 18a and 18a in the cutouts 16 and 16 of the squeeze type core material 2, the gap ΔW between the side surface of the core material intermediate portion 6 of the core material 2 and the spacers 18a and 18a can be made a desired amount. If it cannot be set, a gap adjusting member is arranged in the gap between the spacers 18a and 18a and the inner side wall 19 of the buckling restraining member 1 to obtain a desired amount of gap ΔW. The gap holding member at this time may be provided by using the gap adjusting member, or may be provided by using the spacers 18a and 18a.

Further, in the above-described embodiment and modification, the gap adjusting members 18b and 17b are arranged on both the upper and lower surfaces of the spacer 18a and the gap adjusting member 17a, but in the example of arranging the gap adjusting materials 18b and 17b only on either the upper surface or the lower surface. There may be.

1: Buckling restraint member 2: Core material 3: Mortar material 3d: Core material facing surface 3e: Gap holding member facing surface 4: Frame plate 4a: Bottom surface 4b, 4c: Elevation surface 6: Core material intermediate part 8: Connecting part 10: Buckling restraint brace 13: Rib 16: Notch 17, 18: Gap holding member 17a: Gap adjusting member 17b, 18b: Gap adjusting material 18a: Spacer Δt: Gap ΔW: Core material lateral gap

Claims (11)

A buckling restraint building material in which a core material is sandwiched between two buckling restraint members.
The two buckling restraining members on the longitudinal side of the core material are provided with a gap holding member for securing a predetermined amount of gap between the core material and the facing surfaces of the two buckling restraining members. A buckling restraint building material characterized by being intervened between. In the buckling restraint building material according to claim 1,
The core material has a cross section orthogonal to the longitudinal direction of the core material, and the length of the two buckling restraint members in the opposite direction is the length in the direction orthogonal to the opposite direction of the two buckling restraint members. A buckling restraint building material characterized by a shorter shape. In the buckling restraint building material according to claim 1 or 2.
A displacement suppressing member that suppresses the lateral displacement of the core material is arranged on the side in the longitudinal direction of the core material.
The gap holding member is a buckling restraint building material including the displacement suppressing member. In the buckling restraint building material according to any one of claims 1 to 3.
On the side in the longitudinal direction of the core material, a gap adjusting member for adjusting the side gap of the core material between the side surface of the core material and the side facing surface of the two buckling restraint members is arranged. Has been
The gap holding member is a buckling restraint building material including the gap adjusting member. In the buckling restraint building material according to claim 3 or 4.
The gap holding member is interposed between the displacement suppressing member or the gap adjusting member, at least one of the two buckling restraining members facing the gap holding member, and the displacement suppressing member or the gap adjusting member. A buckling restraint building material characterized by being composed of a clearance adjusting material. In the buckling restraint building material according to claim 5.
The gap holding member is a buckling restraint building material having a fixing means for fixing the gap adjusting member to the displacement suppressing member or the gap adjusting member. In the buckling restraint building material according to claim 5.
The gap adjusting material is a buckling restraint building material characterized by being a low-strength member having a strength lower than that of the core material. In the buckling restraint building material according to any one of claims 1 to 7.
The buckling restraint member is a buckling restraint building material characterized in that a frame plate is filled with concrete or mortar. In the buckling restraint building material according to any one of claims 1 to 8.
The two buckling restraint building materials are characterized in that the surface facing the gap holding member facing the gap holding member is smoothed and the surface facing the core material is not smoothed. It is a method of manufacturing a buckling restraint building material in which a core material is sandwiched between two buckling restraint members.
The two buckling restraining members on the longitudinal side of the core material are provided with a gap holding member for securing a predetermined amount of gap between the core material and the facing surfaces of the two buckling restraining members. And the process of intervening between
A method for manufacturing a buckling restraint building material, which comprises a step of fixing the two buckling restraint members to each other. In the method for manufacturing a buckling restraint building material according to claim 10.
A method for producing a buckling restraint building material, which comprises a step of removing the gap holding member.

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