JP2023127826A - Buckling restriction building material and production method of buckling restriction building material - Google Patents

Abstract

To provide a buckling restriction building material that secures a specific gap between a core material and the surfaces of two buckling restriction members that face the core material, at a reduced cost.SOLUTION: A buckling restriction building material (buckling restriction brace 10) clamps a core material 2 with two buckling restriction members 1, 1. A gap keeping member 18 is configured to secure a specific gap Δt between the core material 2 and surfaces 3d, 3d of the two buckling restriction members 1, 1 that face the core material. The gap keeping member 18 is interposed between the two buckling restriction members 1, 1 on the side of the core material 2. The gap keeping member 18 consists of a bar-like base member 18a long in a longitudinal direction of the core material 2 and a cylindrical member 18b into which the bar-like base member 18a.SELECTED DRAWING: Figure 4

Description

The present invention relates to buckling restraint building materials such as buckling restraint braces that are incorporated between the layers of the main frame of a structure and absorb energy by plastically deforming when interlayer deformation occurs to suppress damage to the structure. The present invention also relates to a method for manufacturing a buckling restrained building material.

As this type of buckling restraining building material, a buckling restraining brace constructed by sandwiching a core material between two buckling restraining members is conventionally known. For example, Patent Document 1 discloses that two buckling restraint members each having a frame plate made of steel plates filled with concrete sandwich a core material made of steel material, and the frame plates of the two buckling restraint members are welded together. A buckling restraint brace is disclosed. In this buckling restraint brace, in order for the buckling restraint building material to function as an earthquake-resistant member/vibration damping member, it is necessary to A gap holding member is arranged to be interposed between the two buckling restraint members, and a predetermined amount of gap is secured between the core material and the surfaces of the two buckling restraint members facing the core material. In addition, this buckling restraint brace uses a gap holding member in which a gap adjustment sheet is provided on the outer surface of the base material (rod-shaped base material), and the gap can be adjusted depending on the thickness of the gap adjustment sheet and the number of layers. The amount is adjusted.

Patent No. 6709452

However, the buckling-restricted building material described in Patent Document 1 employs a rod-shaped base material that is the base material of the gap retaining member with dimensions that approximately match the desired gap amount, and the actual gap amount and the desired gap amount are different from each other. The error in the gap amount is adjusted using a gap adjustment sheet. In this case, it becomes necessary to produce a dedicated rod-shaped base material having dimensions that match the desired gap amount, which increases manufacturing costs. Further, in the manufacturing process of this buckling-restricted building material, a gap adjustment process is required in which the error between the actual gap amount and the desired gap amount is adjusted using a gap adjustment sheet, which also causes an increase in manufacturing costs.

In order to solve the above-mentioned problems, the present invention provides a buckling-restricted building material in which a core material is sandwiched between two buckling-restricting members, the core material and the core-opposed surfaces of the two buckling-restricting members. A gap holding member for securing a predetermined amount of gap between the two buckling restraint members on the sides of the core material is interposed between the two buckling restraining members, and the gap holding member is arranged between the core material and the buckling restraining member. It is characterized by being composed of a rod-shaped base material elongated in the longitudinal direction, and a cylindrical member into which the rod-shaped base material is inserted.
According to the present invention, by interposing the gap retaining member disposed on the side of the core material (outward in the lateral direction of the core material) between the two buckling restraining members, the core material and the two buckling A predetermined amount of clearance is secured between the restraining member and the surface facing the core material. This allows the core material and the two buckling restraint members to face each other without placing a special member such as a sandwiched member between the core material and the core material facing surfaces of the two buckling restraint members. A predetermined amount of clearance can be secured between the surface and the surface.
Furthermore, since the gap retaining member of the present invention is disposed on the side of the core material, it prevents deformation of the core material (deformation of the two buckling restraining members in opposite directions) when the core material is subjected to an axial compressive load. Never.
Furthermore, in the present invention, since a cylindrical member having a rod-shaped base material inserted therethrough is used as the gap retaining member, the amount of the gap can be defined by the external dimensions of the cylindrical member. A cylindrical member that has external dimensions that match the desired gap amount and internal dimensions that allow the rod-shaped base material to be inserted is a long rod-shaped base material that has an outside diameter that matches the desired gap amount. Generally, it can be produced at a lower cost than when it is produced. Moreover, since the gap amount is defined by the external dimensions of the cylindrical member, the dimensions of the rod-shaped base material can be set freely regardless of the desired gap amount, so that the cost of the rod-shaped base material is reduced. Furthermore, since the gap amount is defined by the external dimensions of the cylindrical member, the gap adjustment process using the conventional gap adjustment sheet can be omitted in the manufacturing process of buckling restraint building materials, thereby reducing manufacturing costs. is possible.
Therefore, according to the present invention, it is possible to provide, at a lower cost, a buckling-restricted building material in which a predetermined amount of clearance is secured between the core material and the core-opposing surfaces of the two buckling restraint members.

Further, in the buckling-restricted building material, the present invention is characterized in that the cylindrical member is a standardized material having a standardized dimension smaller than the predetermined gap.
According to the present invention, since a standard material with standard dimensions smaller than the desired gap amount is used as the rod-shaped base material, lower costs are achieved than when using a special material with external dimensions that match the desired gap amount. can.

Moreover, the present invention is characterized in that, in the buckling-restricted building material, the cylindrical member is fixed on the rod-shaped base material.
By fixing the cylindrical member on the rod-shaped base material, relative movement between the cylindrical member and the rod-shaped base material is prevented, and the cylindrical member is placed at an appropriate position (longitudinal position) on the rod-shaped base material. It becomes easier to place the

Further, in the buckling-restricted building material, the present invention is characterized in that the rod-shaped base material has a substantially circular cross-sectional shape, and the cylindrical member is a substantially cylindrical member.
Since rod-shaped base materials and cylindrical members having such shapes are easy to process, they are easily available at low cost, and it is easy to realize low costs.

Further, the present invention is characterized in that, in the buckling-restricted building material, the cylindrical members are arranged at a plurality of locations spaced apart from each other in the longitudinal direction of the rod-shaped base material.
According to this, the amount of cylindrical members to be used can be reduced compared to the case where cylindrical members are provided over the entire longitudinal direction of the rod-shaped base material, and lower costs can be realized.

Moreover, the present invention is characterized in that, in the buckling-restricted building material, the gap retaining member is a displacement suppressing member that suppresses lateral displacement of the core material.
In the present invention, the gap adjusting member is used as a displacement suppressing member to suppress lateral displacement of the core material. As a result, when the core material is subjected to an axial compressive load, deformation and buckling of the core material in a direction perpendicular to the opposing direction of the two buckling restraining members is appropriately suppressed by the gap adjustment member (displacement restraining member). Can be restrained. According to the present invention, it is possible to simplify the structure, reduce weight, etc. compared to the case where a gap retaining member is provided separately from the displacement suppressing member.

Further, the present invention is characterized in that, in the buckling restraining building material, the buckling restraining member is a frame board filled with concrete or mortar.
According to the present invention, it is possible to realize a buckling-restricted building material that is relatively lightweight and has high performance.

Further, in the buckling restraint building material, the present invention provides that the rod-shaped base material of the gap retaining member interposed between the two buckling restraint members extends from the two buckling restraint members in the longitudinal direction of the core material. It is characterized by having a stop part that stops it from coming out to the outside.
The gap holding member interposed between the two buckling restraint members exists in the form of a cylindrical member sandwiched between the two buckling restraint members. In this case, the cylindrical member cannot move in the longitudinal direction of the core material, but the rod-shaped base material inserted into the cylindrical member slides on the inner wall surface of the cylindrical member and moves in the longitudinal direction of the core material. It is possible. Therefore, a situation may occur in which the rod-shaped base material of the gap retaining member interposed between the two buckling restraint members comes out from the two buckling restraint members to the outside in the longitudinal direction of the core material. In addition, in the manufacturing process of buckling-restricted building materials, the rod-shaped base material can move in the longitudinal direction of the core material together with the cylindrical member before being sandwiched between two buckling-restricted members. Therefore, a situation may occur in which the rod-shaped base material and the cylindrical member that constitute the gap retaining member come out from the two buckling restraining members to the outside in the longitudinal direction of the core material.
According to the present invention, since the rod-shaped base material of the gap retaining member interposed between two buckling restraint members has a stop portion that stops the rod-shaped base material from coming out from the two buckling restraint members to the outside in the longitudinal direction of the core material, this It is possible to prevent such situations from occurring.

The present invention also provides a method for manufacturing a buckling-restricted building material in which a core material is sandwiched between two buckling-restricting members, wherein a portion is located between the core material and a core-opposing surface of the two buckling-restricting members. The method includes a step of interposing a gap retaining member for securing a certain amount of gap between the two buckling restraining members on the sides of the core material, and a step of fixing the two buckling restraining members to each other. The present invention is characterized in that the gap holding member is composed of a rod-shaped base material elongated in the longitudinal direction of the core material and a cylindrical member into which the rod-shaped base material is inserted.
According to the present invention, by interposing the gap retaining member disposed on the side of the core material between the two buckling restraint members, the space between the core material and the core material facing surfaces of the two buckling restraint members is Ensure a specified amount of clearance. This allows the core material and the two buckling restraint members to face each other without placing a special member such as a sandwiched member between the core material and the core material facing surfaces of the two buckling restraint members. A predetermined amount of clearance can be secured between the surface and the surface.
Furthermore, since the gap retaining member of the present invention is disposed on the side of the core material, it prevents deformation of the core material (deformation of the two buckling restraining members in opposite directions) when the core material is subjected to an axial compressive load. Never.
Furthermore, in the present invention, since a cylindrical member having a rod-shaped base material inserted therethrough is used as the gap retaining member, the amount of the gap can be defined by the external dimensions of the cylindrical member. A cylindrical member that has external dimensions that match the desired gap amount and internal dimensions that allow the rod-shaped base material to be inserted is a long rod-shaped base material that has an outside diameter that matches the desired gap amount. Generally, it can be produced at a lower cost than when it is produced. Moreover, since the gap amount is defined by the external dimensions of the cylindrical member, the dimensions of the rod-shaped base material can be set freely regardless of the desired gap amount, so that the cost of the rod-shaped base material is reduced. Furthermore, since the gap amount is defined by the external dimensions of the cylindrical member, the gap adjustment process using the conventional gap adjustment sheet can be omitted in the manufacturing process of buckling restraint building materials, thereby reducing manufacturing costs. is possible.
Therefore, according to the present invention, it is possible to provide, at a lower cost, a buckling-restricted building material in which a predetermined amount of clearance is secured between the core material and the core-opposing surfaces of the two buckling restraint members.

According to the present invention, it is possible to provide, at a lower cost, a buckling restraint building material in which a predetermined amount of clearance is secured between the core material and the surfaces of the two buckling restraint members facing the core material.

FIG. 2 is a perspective view of a buckling restraint brace in an embodiment. FIG. 3 is an exploded perspective view of the buckling restraint brace. FIG. 3 is a vertical cross-sectional view showing the internal structure of the buckling restraint brace. FIG. 3 is a cross-sectional view showing the internal structure of the buckling restraint brace. FIG. 3 is a plan view showing a core material and spacer that constitute the buckling restraint brace. The side view which shows the core material which constitutes the same buckling restraint brace. FIG. 3 is a vertical sectional view of one end side of the buckling restraint brace. (a) is a longitudinal sectional view showing an example in which a square tube is fixed by welding to a spacer in a gap retaining member of the same buckling restraint brace. (b) is a longitudinal sectional view showing an example in which a square tube is fixed to a spacer in a gap holding member of the same buckling restraint brace with a stopper. The exploded perspective view of the buckling restraint brace in a modified example. FIG. 3 is a cross-sectional view showing the internal structure of 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 is not limited to use as a brace, but can also be used for beams, columns, foundations, etc., and the buckling restraint brace of the present embodiment described below It is also possible to use it for beams, columns, foundations, etc.

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

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

The core material 2 of this embodiment has a flat plate shape, and more specifically, in the cross section (the cross section shown in FIG. 4) perpendicular to the longitudinal direction of the core material 2, the two buckling restraining members 1, 1 face each other. The length in the vertical direction in FIG. 4 is shorter than the length in the direction perpendicular to the opposing direction of the two buckling restraint members 1, 1 (the horizontal direction in FIG. 4). Note that 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 this embodiment has a single steel plate structure consisting of a flat core material intermediate portion 6 and connecting portions 8, 8 provided at both ends thereof. . Note that the connecting portions 8, 8 may be formed by bonding reinforcing plates to the upper and lower surfaces of a steel plate (base material of the core material 2) extending from the core intermediate portion 6. With this reinforcing plate, the strength of the connecting parts 8, 8 is increased more than the strength of the core intermediate part 6.

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

The core intermediate portion 6 of the core material 2 is formed by forming long notches 16, 16 in the longitudinal direction of the core material 2 on both sides of a 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, 8. The strength of the core intermediate portion 6 can be adjusted as appropriate by changing the width and longitudinal length of the notches 16, 16. Therefore, by appropriately selecting the dimensions of the notches 16, 16 of the core intermediate portion 6, the axial rigidity and yield strength of the core 2 can be set to desired values.

In addition, in the present embodiment, a space on the side of the core material 2 (outward in the transverse direction of the core material 2) created by the notches 16, 16 of the core material intermediate portion 6 (internal space of the notches 16, 16) Spacers 18a, 18a are arranged. The spacers 18a, 18a function as a displacement suppressing member that suppresses displacement of the core material 2 in the lateral direction (vertical direction in FIG. 5). That is, if the spacers 18a, 18a are not arranged, the core intermediate portion 6 of the core 2 can be displaced until it contacts the inner wall 19 of the buckling restraining member 1 (that is, by the width of the notch 16). However, by arranging the spacers 18a, 18a, it can only be displaced until it comes into contact with the spacers 18a, 18a, and it can be displaced to the side of the core material 2 (core material intermediate portion 6) by the width of the spacers 18a, 18a. displacement is suppressed.

By arranging such spacers 18a, 18a on the sides of the core material 2 as displacement suppressing members, the gap between the core material 2 and the inner wall 19 of the buckling restraining member 1 (the lateral space of the core material 2) is reduced. Even if it is too wide, the amount by which the core material 2 can be displaced laterally can be adjusted, and it becomes possible to appropriately control the deformation and buckling of the core material 2 when the core material 2 is subjected to an axial compressive load. In particular, in a configuration in which the notches 16, 16 are provided to adjust the strength of the core intermediate portion 6 as in this embodiment, the strength of the core intermediate portion 6 can be adjusted by arranging the spacers 18a, 18a. It becomes easy to achieve both optimization and optimization of the amount by which the core material 2 can be displaced laterally.

The longitudinal dimensions of the spacers 18a, 18a are set slightly smaller than the longitudinal dimensions of the notches 16, 16. As a result, a gap is formed between the longitudinal ends of the spacers 18a, 18a and the longitudinal inner end surfaces of the connecting parts 8, 8, and when the core material 2 is subjected to an axial compressive load, the connecting parts 8, 8 of the core material 2 are The inner end surface in the longitudinal direction does not come into contact with the spacers 18a, 18a. Therefore, even if the spacers 18a, 18a are arranged, the yield strength will not change. Note that the spacers 18a, 18a may be made of scraps from cutting the notches 16, 16, or may be made of separate members such as square bars or round bars.

The mortar materials 3, 3 constituting the buckling restraint members 1, 1 of this embodiment are mortar blocks manufactured at a different location from the frame plates 4, 4. Both end portions 3b, 3b of the mortar materials 3, 3 have diagonal grooves 20, 20 into which ribs 13, 13 provided on the connecting portions 8, 8 of the core material 2 are inserted, as shown in FIGS. 2 and 7. has been established.

The frame plates 4, 4 constituting the buckling restraining members 1, 1 of this embodiment are formed of steel plates, and as shown in FIG. 4, rise from the bottom surface 4a and both ends thereof in the width direction (left and right direction in FIG. 4). It consists of vertical surfaces 4b and 4c, and is configured to have a U-shaped cross section. Note that the heights of the vertical surfaces 4b and 4c from the bottom surface 4a are such that one vertical surface 4b is higher than the other vertical surface 4c, as shown in FIG.

Further, as shown in FIG. 2, at both longitudinal ends of the frame plates 4, 4, a pair of pads 24, 24 are provided. Mortar materials 3, 3 made of mortar blocks are inserted into each frame plate 4, 4 from the opening side thereof.

Next, a predetermined amount of air is formed between the core material 2 and the core material facing surfaces 3d of the two buckling restraint members 1, 1 (the core material facing surfaces 3d of the mortar materials 3, 3), which is a characteristic part of the present invention. A method for ensuring the gap Δt will be explained.
The gap Δt between the core material 2 and the core material opposing surfaces 3d of the two buckling restraint members 1, 1 is set to a high degree of precision, especially when the present buckling restraint brace 10 is to function as an earthquake-resistant member/vibration damping member. required to do so. That is, if this gap Δt is too wide, when the core material 2 is subjected to an axial compressive load, the core material intermediate portion 6 of the core material 2 will bend in the direction in which the two buckling restraining members 1, 1 are opposed (vertical direction in FIG. 4). plastic deformation occurs locally. On the other hand, if this gap Δt is too narrow, when the core material 2 is subjected to an axial compressive load, the core material 2 will be restricted by the two buckling restraint members 1, 1, and will not be able to fully move in the opposing 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, 1.

As a method of securing this gap Δt, a method of sandwiching a sandwiched member such as rubber between the core material 2 and the core material facing surfaces 3d, 3d of the two buckling restraint members 1, 1, and merging them. Conceivable. However, as described above, in this method, when the core material 2 and the sandwiched member are sandwiched between the two buckling restraint members 1, 1 at the time of merging, the sandwiched member is deformed due to the sandwiching. Unless the thickness of the sandwiched member is controlled with high precision, it is not possible to secure a predetermined amount of the gap Δt. In addition, after merging, the sandwiched member interposed between the core material 2 and the core material opposing surfaces 3d, 3d of the two buckling restraint members 1, 1 will be It must be able to exhibit characteristics that do not inhibit the deformation (distortion) of the core material 2. As described above, the above method requires a member to be sandwiched that satisfies these conditions, which is not only expensive but also extremely difficult to secure a predetermined amount of gap Δt with high precision. .

Therefore, in this embodiment, as shown in FIG. Gap retaining members 18, 18 are provided between the core material facing surfaces 3d, 3d of the two buckling restraining members 1, 1 on the sides of the material 2. If the gap Δt is obtained by arranging such gap retaining members 18, 18 between the core material facing surfaces 3d, 3d, the core material 2 and the core material facing surfaces of the two buckling restraint members 1, 1. A predetermined amount of the gap Δt can be secured without arranging a special member such as a member to be sandwiched between the members 3d and 3d.

Moreover, as in the present embodiment, by arranging the gap retaining member 18 on the side of the core material 2, the gap retaining member 18 for securing the gap Δt allows the core material 2 to be subjected to an axial compressive load. The deformation (distortion) of 2 is not hindered.

Moreover, the gap holding member 18 of this embodiment is comprised from the above-mentioned spacer 18a and the square tube 18b as a cylindrical member into which the spacer 18a is inserted. The gap retaining member 18 has the spacer 18a inserted into the square tubes 18b, 18b, and the gap retaining member facing surfaces 3e, 3e of the buckling restraining members 1, 1 (the gap retaining member facing surface 3e of the mortar material 3). , 3e). In this way, since the gap holding member 18 can be obtained using the spacer 18a, it is possible to simplify the structure and reduce the weight, etc., compared to the case where the gap holding member is provided separately from the spacer 18a. It becomes possible.

Here, a gap holding member with a thicker spacer 18a may be used. That is, a single gap holding member that also functions as the spacer 18a may be used. However, in this case, it is necessary to function as the spacer 18a, which narrows the material options for the gap retaining member, and in addition, the scraps from cutting the notches 16, 16 of the core material 2 are used as the spacer 18a. This has the disadvantage of making it impossible to do so, which increases costs. In addition, the gap Δt is required to be set with high precision as described above, so in order to secure a predetermined amount of the gap Δt, the thickness of the gap retaining member must be processed with high precision, which reduces cost. Invite an increase.

Therefore, the gap holding member 18 in this embodiment is composed of a spacer 18a having a rectangular cross section and serving as a rod-shaped base material, and a square tube 18b serving as a cylindrical member into which the spacer 18a is inserted. With such a gap holding member 18, the gap Δt can be defined by the external dimensions of the square tube 18b (the external dimensions in the clamping direction by the gap holding member facing surfaces 3e, 3e of the buckling restraint members 1, 1) do. can. Such a square tube 18b can be manufactured by a manufacturing method such as casting, extrusion molding, machining, etc., and generally can be manufactured easily and inexpensively with high dimensional accuracy in the external dimension do and internal dimension di (thickness). Therefore, a predetermined amount of the gap Δt can be easily secured at low cost and with high precision.

The square tube 18b in this embodiment may be made of a material that has a rigidity that does not easily deform even if it is sandwiched between the gap retaining member facing surfaces 3e, 3e of the buckling restraint members 1, 1. There are no restrictions. The square tube 18b is preferably made of, for example, steel, but may be made of other metals, resins, or other materials.

In this embodiment, the inner dimension di of the square tube 18b is made slightly larger than the outer dimension eo of the spacer 18a, and a slight gap Δe is formed between the square tube 18b and the spacer 18a. It is configured so that the spacer 18a can be inserted therethrough. Therefore, when the square tube 18b is strongly pinched by the gap retaining member facing surfaces 3e, 3e of the buckling restraint members 1, 1, the square tube 18b is crushed and deformed by the gap Δe between the square tube 18b and the spacer 18a. There is a risk of The square tube 18b should be formed of a material with sufficient rigidity so that even if the shape is deformed by this gap Δe, the thickness of the square tube 18b will not be further compressed and easily deformed. preferable.

The cylindrical member of this embodiment is a square tube 18b, and sides exist along the direction in which the buckling restraining members 1, 1 are held by the gap retaining member facing surfaces 3e, 3e. Therefore, even if the rectangular tube 18b is strongly pinched between the gap retaining member facing surfaces 3e, 3e of the buckling restraint members 1, 1, the shape of the square tube 18b is not easily deformed. With such a configuration, the gap Δt can be defined by the external dimension do of the square tube 18b. Even if a shape deformation equal to the gap Δe occurs, the gap Δt will not become less than the sum of the outer dimension eo of the spacer 18a and the thickness of the square tube 18b (the thickness of two tubes), and the gap Δt It is possible to prevent the value from falling below the allowable lower limit.

The external dimension do of the square tube 18b is set according to the total amount of the thickness tc of the core material 2 and the desired amount of the gap Δt. For example, if the allowable upper limit of the gap Δt is 15% of the thickness tc of the core material 2, and if the manufacturing error is ε, the external dimension do of the square tube 18b is set as do=tc×15%−ε. Good too.

Moreover, the internal dimension di of the square tube 18b is set according to the total amount of the external dimension eo of the spacer 18a and the desired amount of the gap Δe. It is preferable to set the gap Δe within a range in which the gap Δt does not fall below the allowable lower limit even if the square tube 18b is crushed by the gap Δe and deformed.

In the present embodiment, the lower limit of the gap Δt (the gap when the core material 2 is shifted toward one side of the core material facing surface 3d) is the lower limit value of the gap between the core materials of the core material 2, assuming that Poisson's ratio is 0.5. Using the plastic strain a with respect to the thickness t in the portion 6, it can be expressed as 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 approximately 3% at maximum, the lower limit value of the gap Δt is approximately 0.6 mm. Note that, as described above, the upper limit value 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 range in which the gap Δt can be set is narrow, and highly accurate management of the gap Δt is required.

In addition, in this embodiment, as well as the gap Δt between the core material intermediate portion 6 of the core material 2 and the core material opposing surfaces 3d of the two buckling restraint members 1, 1, the side surface of the core material intermediate portion 6 of the core material 2 The gap ΔW (the gap when the core material 2 and the spacers 18a, 18a are shifted toward one inner wall 19 of the buckling restraining member 1) between the spacer 18a and the spacer 18a is also relatively high, although it is not as large as the gap Δt. Accuracy is required. For example, in the above example, if the width of the core material 2 at the core material intermediate portion 6 is 400 mm, and the plastic strain a of the core material 2 is approximately 3% at maximum, the lower limit of the gap ΔW is approximately 6 mm. Become. As described above, the upper limit value of this 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 range in which the gap ΔW can be set is narrow, and the gap ΔW must also be managed with a correspondingly high degree of precision.

Further, when assembling the gap retaining member 18 by inserting the spacer 18a into the square tube 18b, it is preferable to fix the square tube 18b so that the position of the square tube 18b does not easily shift with respect to the spacer 18a. At this time, for example, if the square tube 18b is made of steel like the spacer 18a, it may be fixed by welding 18c as shown in FIG. 8(a). In this case, the square tube 18b can be firmly fixed to the spacer 18a, and the movement of the spacer 18a with respect to the square tube 18b in both the longitudinal and lateral directions of the core material 2 is restricted. In the example of FIG. 8(a), both ends of the square tube 18b are welded 18c, but only one end may be welded 18c.

Alternatively, as shown in FIG. 8(b), a stopper (such as a clip) 18d may be fixed to the spacer 18a to prevent the square tube 18b from shifting relative to the spacer 18a. In this case, the spacer 18a can move in the longitudinal direction of the core material 2 with respect to the square tube 18b by the gap between the square tube 18b and the stopper 18d. Further, the spacer 18a can also move in the lateral direction of the core material 2 with respect to the square tube 18b by the slight gap Δe between the square tube 18b and the spacer 18a.

Note that instead of the stopper 18d shown in FIG. 8(b), a welding bulge (protrusion) may be formed on the spacer 18a and used as a stopper. In this case, there is no need to prepare a new part such as the stopper 18d, and it is possible to reduce the number of parts and simplify the manufacturing process.

Further, it is preferable that the gap holding member 18 is not fixed to the core material 2, the mortar material 3, the frame plate 4, etc. By not fixing the gap retaining member 18, when the core material 2 is subjected to an axial compressive load or when the core material 2 is displaced laterally, it is not fixed to the core material 2, the mortar material 3, the frame plate 4, etc. The gap holding member 18 can now move slightly, making it easy to appropriately suppress and restrain deformation and buckling of the core material 2 when the core material 2 is subjected to an axial compressive load. Further, by not fixing the gap holding member 18, the process of fixing the gap holding member 18 is not necessary in the manufacturing process of the buckling restraint brace 10, and the manufacturing process can be simplified.

Next, a method for manufacturing the buckling restraint brace 10 in this embodiment will be explained.
First, frame plates 4, 4 are manufactured. Specifically, after a flat steel plate is bent to form the bottom surface 4a and the vertical surfaces 4b, 4c, a pair of pads 24, 24 made of another steel plate are attached by welding. Thereafter, mortar materials 3, 3 made of mortar blocks prepared separately are housed in the frame plates 4, 4.

Further, a core material 2 made by processing and welding a steel plate is prepared, and this core material 2 is placed on the mortar material 3 in one of the frame plates 4. In the notches 16, 16 of the core material 2, gap retaining members 18, 18, each having a spacer 18a inserted through two square tubes 18b, 18b, are arranged. Thereafter, the remaining frame plates 4 are combined as shown in FIG. 2, and the vertical surfaces 4b and 4c between each frame plate 4 are joined by fillet welding 4d as shown in FIG. In this way, the buckling restraint brace 10 is manufactured.

Here, the gap retaining member facing surfaces 3e, 3e of the buckling restraint members 1, 1, which the square tubes 18b, 18b face, are surfaces of the mortar material 3, 3, so if they are left as they are, the surfaces will be rough and lack smoothness. , the flatness is also low. In this case, it is difficult to secure a predetermined amount of gap Δt between the core material 2 and the core material facing surfaces 3d of the two buckling restraining members 1, 1 (the core material facing surfaces 3d of the mortar materials 3, 3). . Therefore, in this embodiment, the gap retaining member facing surfaces 3e, 3e of the buckling restraint members 1, 1 are smoothed. The smoothing treatment is not particularly limited as long as it is a treatment that reduces surface roughness and improves flatness, and may be a polishing treatment or a coating treatment.

On the other hand, the portions of the core material facing surfaces 3d, 3d that face the core material 2 do not require such smoothing treatment, so the core material facing surfaces 3d, 3d of this embodiment remain rough surfaces. . In this way, since only a portion of the surface of the mortar materials 3, 3 needs to be smoothed, the work load of the smoothing process is reduced.

Moreover, in the conventional method of sandwiching and merging a member such as rubber between the core member 2 and the core member opposing surfaces 3d, 3d of the two buckling restraint members 1, 1, In order to ensure a certain amount of gap Δt, it is necessary to perform a smoothing process on the core material facing surfaces 3d, 3d. Since the gap retaining member facing surfaces 3e, 3e, which are the targets of the smoothing process in this embodiment, have a smaller area than the core material facing surfaces 3d, 3d, the smoothing process according to the present embodiment is more effective than in the conventional method. This has the advantage of reducing the burden of performing the process.

In addition, as the gap holding member 18 in this embodiment, a square tube 18b with a spacer 18a inserted therein is used. Thereby, the gap Δt can be defined by the external dimensions of the square tube 18b. As described above, the square tube 18b has an outer diameter that matches the desired clearance amount and an inner diameter that allows the spacer 18a to be inserted, and the spacer 18a itself has an outer diameter that matches the desired clearance amount. It can be manufactured easily and inexpensively compared to the case where it is manufactured with . Since the amount of the gap Δt is thus defined by the external dimensions of the square tube 18b, the spacer 18a can be freely set regardless of the desired amount of the gap Δt. Therefore, as the spacer 18a, for example, the scraps of the core material 2 (having the same thickness as the core material 2) after cutting the notches 16, 16 may be used, or the spacer 18a may have a standard size smaller than the desired amount of the gap Δt. Since square steel, which is a standardized material, can be used, the cost of the spacer 18a is low.

Furthermore, since the amount of the gap Δt is defined by the external dimensions of the square tube 18b, the conventional gap adjustment process using a gap adjustment sheet can be omitted in the manufacturing process of the buckling restraint brace 10. It is possible to lower manufacturing costs.

Further, in this embodiment, as shown in FIG. 2, square tubes 18b are provided at a plurality of locations spaced apart from each other in the longitudinal direction on the circumferential surface of the spacer 18a. With such a configuration, the amount of square tubes 18b used can be reduced and costs can be lowered than when square tubes 18b are provided over the entire length of the spacer 18a.

Further, there are cases where the gap retaining member facing surfaces 3e, 3e of the buckling restraint members 1, 1 are not flat in the longitudinal direction of the spacer 18a (for example, they are inclined or uneven). Even in such a case, by providing the square tubes 18b at multiple locations spaced apart from each other as in this embodiment, when the two buckling restraining members 1, 1 are combined, the relationship between the square tubes 18b and the spacer will be reduced. The presence of the gap Δe can suppress excessive deformation and bending of the spacer 18a. Alternatively, even in the case described above, since the square tubes 18b are provided at multiple locations spaced apart from each other as in this embodiment, when the two buckling restraint members 1, 1 are combined, the square tubes 18b and the spacer Due to the existence of the gap Δe, it is possible to prevent a gap from being generated between the square tube 18b and the gap retaining member facing surfaces 3e, 3e of the buckling restraint members 1, 1. As a result, it is possible to obtain a gap Δt with less unevenness in the longitudinal direction.

Such an effect due to the gap Δe between the square tube 18b and the spacer 18a is obtained by having a configuration in which the spacer 18a is movable in the lateral direction of the core material 2 with respect to the square tube 18b. Therefore, if the square tube 18b is firmly fixed to the spacer 18a as in the example shown in FIG. 8(a), the effect of such a gap Δe cannot be obtained. However, the example shown in FIG. 8(a) has the advantage of realizing a simple configuration, and even in the example shown in FIG. By bending, no gap is created between the square tube 18b and the gap retaining member facing surfaces 3e, 3e of the buckling restraint members 1, 1, and a gap Δt with less unevenness in the longitudinal direction is obtained. You can enjoy the benefits of being able to do so.

Note that the distance between the square tubes 18b in the longitudinal direction of the spacer 18a, the number of square tubes 18b, and the like affect the deformation and bending of the spacer 18a in the lateral direction (vertical direction in FIG. 5) of the core material 2. Therefore, the distance between the square tubes 18b and the number of square tubes 18b are determined by the magnitude of the force acting on the frame plates 4, 4 due to the deformation and buckling of the core material 2 when the core material 2 is subjected to an axial compressive load, the number of buckling modes, etc. is set as appropriate.

Moreover, the buckling restraint brace 10 of the present embodiment has a quadrangular prism-like outer shape (the outer shape of the frame plate 4 of the buckling restraint members 1, 1) whose cross-section perpendicular to the longitudinal direction has a rectangular shape. However, it is not limited to this. For example, it may have a triangular prism-like or polygonal prism-like external shape, a cylindrical external shape, an elliptical cylindrical external shape, or the like.

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

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

The gap holding members 17, 17 of this modification include a round bar member (round steel) 17a which is a bar-shaped base material with a circular cross section, and a round tube 17b which is a cylindrical member into which the round bar member 17a is inserted. It is composed of. In this modification, the gap holding members 17, 17 are arranged such that the round bar member 17a is inserted into the round tubes 17b, 17b, and the gap holding member facing surfaces 3e, 3e (mortar) of the buckling restraint members 1, 1 are It is arranged so as to be interposed between the gap retaining member facing surfaces 3e, 3e) of the material 3.

Also in this modification, by using the gap holding member 17, the gap Δt can be defined by the external dimension (outer diameter) do of the round tube 17b. In general, such a round tube 17b can be easily and inexpensively manufactured with high dimensional accuracy in its outer dimensions (outer diameter) do and inner dimensions (inner diameter) di (thickness), so that a predetermined amount of gap Δt can be produced. It can be easily, inexpensively, and ensured with high accuracy.

Moreover, in this modification, as shown in FIG. 9, the round tubes 17b are provided at a plurality of locations spaced apart from each other in the longitudinal direction on the circumferential surface of the round bar member 17a. With this configuration, the amount of round tubes 17b to be used can be reduced compared to the case where round tubes 17b are provided over the entire circumferential surface of the round bar member 17a in the longitudinal direction, and lower costs can be achieved. I can do it.

Note that the gap retaining members 17, 17 of this modification are examples of round bar members (round steel) having a circular cross section, but are not limited to this, and may be, for example, square bar members (square steel) having a rectangular cross section. It's okay.

In addition, the gap holding members 17, 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 lateral opposing surfaces of the two buckling restraint members 1, 1. It also functions as a gap adjustment member. Therefore, the gap holding members 17, 17 are configured to exist also on the sides of the connecting parts 8, 8.

Such a gap adjustment member has the width of the core material 2 necessary to realize the function required of the core material 2, and the width of the buckling restraint member 1 necessary to realize the function required of the buckling restraint member 1. This is used when the gap between the side surface of the core material 2 and the inner walls 19, 19 of the buckling restraint members 1, 1 cannot be set to a desired amount due to the width of the core material 2. Since the gap holding member 17 of this modification also functions as such a gap adjustment member, the structure is simplified and the weight is reduced compared to the case where a gap holding member is provided separately from the gap adjustment member. becomes possible.

In addition, the gap holding members 17, 17 of this modification also function as displacement suppressing members that suppress lateral displacement of the core material 2, similar to the gap holding member 18 of the embodiment described above.

Further, in this modification, the core material 2 is of a straight type. As in the embodiment described above, in the configuration in which the gap retaining members 18, 18 are disposed within the cutouts 16, 16 of the squeeze-type core material 2, the gap retaining members 18, 18 move in the longitudinal direction of the core material 2. Even if an attempt is made to do so, the gap retaining members 18, 18 are caught on the inner walls of the notches 16, 16 of the core material 2, and are restricted from coming out from the buckling restraining members 1, 1 to the outside in the longitudinal direction of the core material 2. However, if the core material 2 is of a straight type as in this modification, there are no notches 16, 16 for stopping the movement of the gap retaining members 17, 17 in the longitudinal direction of the core material. There is a possibility that the buckling restraining members 1, 1 may come out from the core member 2 in the longitudinal direction.

For example, during the manufacturing process, before the buckling restraint members 1, 1 are combined, the buckling restraint member 1 is tilted with the gap retaining members 17, 17 installed on the mortar material 3 of the buckling restraint member 1. When this happens, the gap holding members 17, 17 may slip and move in the longitudinal direction of the core material 2, and may come out from the buckling restraint members 1, 1. Further, even after the buckling restraint members 1, 1 are combined, if the round tube 17b forming the gap retaining members 17, 17 is not fixed on the round bar member 17a, the buckling restraint member 1, Even if the round tube 17b sandwiched between the core members 1 and 1 cannot move, the round rod member 17a inserted therein can slide on the inner wall surface of the round tube 17b and move in the longitudinal direction of the core member 2. Therefore, there is a possibility that the round bar member 17a comes out from the buckling restraint members 1, 1.

Therefore, in this modification, it is preferable to provide a stop portion for stopping the gap holding members 17, 17 from coming out from the buckling restraint members 1, 1 to the outside in the longitudinal direction of the core material 2. As this stop portion, for example, the butts 24, 24 of the frame plates 4, 4 forming the longitudinal end faces of the core materials of the buckling restraint members 1, 1 can be used. Further, when the round tube 17b constituting the gap retaining members 17, 17 is fixed on the round bar member 17a, the inner wall surface in the width direction of the frame plates 4, 4 (inner wall surface of the vertical surfaces 4b, 4c) In addition, a protrusion may be provided to catch the round tube 17b when the gap holding members 17, 17 move in the longitudinal direction of the core material, and this may be used as a stop portion.

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

1: Buckling restraint member 2: Core material 3: Mortar material 3d: Core material opposing surface 3e: Gap retaining member opposing surface 4: Frame plate 4a: Bottom surface 4b, 4c: Elevated surface 4d: Welding 6: Core material intermediate portion 8 : Connecting part 10 : Buckling restraint brace 13 : Rib 16 : Notch parts 17, 18 : Gap holding member 17a : Round bar member 17b : Round tube 18a : Spacer 18b : Square tube 18c : Welding 18d : Stopper Δt : Gap ΔW : Core material side gap

Claims (9)

A buckling restraint building material in which a core material is sandwiched between two buckling restraint members,
A gap retaining member for securing a predetermined amount of gap between the core material and the core material facing surfaces of the two buckling restraint members is provided between the two buckling restraint members on the side of the core material. It is mediated by
The buckling restraining building material is characterized in that the gap holding member is composed of a rod-shaped base material elongated in the longitudinal direction of the core material, and a cylindrical member into which the rod-shaped base material is inserted. The buckling restrained building material according to claim 1,
The buckling-restricted building material is characterized in that the rod-shaped base material is a standard material having a standard dimension smaller than the predetermined gap. The buckling restrained building material according to claim 2,
A buckling restraint building material, wherein the cylindrical member is fixed on the rod-shaped base material. The buckling restrained building material according to any one of claims 1 to 3,
The rod-shaped base material has a substantially circular cross-sectional shape,
The buckling restraint building material is characterized in that the cylindrical member is a substantially cylindrical member. The buckling restrained building material according to any one of claims 1 to 4,
The buckling-restricted building material is characterized in that the cylindrical members are arranged at a plurality of locations spaced apart from each other in the longitudinal direction of the rod-shaped base material. The buckling restrained building material according to any one of claims 1 to 5,
A buckling restraining building material, wherein the gap holding member is a displacement restraining member that restrains lateral displacement of the core material. The buckling restraint building material according to any one of claims 1 to 6,
A buckling restraining building material, wherein the buckling restraining member is a frame board filled with concrete or mortar. The buckling restrained building material according to any one of claims 1 to 7,
The rod-shaped base material of the gap retaining member interposed between the two buckling restraint members has a stop portion that prevents the core material from coming out from the two buckling restraint members to the outside in the longitudinal direction. Features buckling restraint building material. A method for manufacturing a buckling restraint building material in which a core material is sandwiched between two buckling restraint members, the method comprising:
A gap retaining member for securing a predetermined amount of gap between the core material and the core material facing surfaces of the two buckling restraint members is provided between the two buckling restraint members on the side of the core material. a step of intervening;
fixing the two buckling restraint members to each other,
A buckling restraint building material characterized in that the gap retaining member is composed of a rod-shaped base material elongated in the longitudinal direction of the core material and a cylindrical member into which the rod-shaped base material is inserted. Production method.

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