JP7701809B2 - Joint Structure - Google Patents

Description

The present invention relates to a joint structure.

In a steel-reinforced concrete (SC) structure, a pair of steel members is joined together by welding or bolting. However, this type of joint structure has challenges, such as the amount of work and management required on-site, and the fact that it may not be possible to construct under certain construction conditions.

In contrast, there are also joint structures that achieve a similar joint structure to rebar lap joints by transferring stress between a pair of steel materials via a filler material. For example, as shown in Figure 8(a), by overlapping a pair of steel materials 1 within a filler material 2 so that the component axial directions are parallel, stress can be transferred between the steel materials 1 via the filler material 2, and the on-site work required to construct the joint structure can be significantly reduced (see Patent Document 1, etc.).

As shown in Figure 8(b), a pair of steel materials 1 with the same axial direction can be arranged butted together inside a tubular joint steel material 3, which is a joint material, and a filler material 2 can be filled inside the joint steel material 3, allowing stress transmission between the steel materials 1 via the filler material 2 and the joint steel material 3 (see Patent Document 2, etc.). In this case, the restraining effect of the joint steel material 3 allows the joint length to be shorter than the joint structure in Figure 8(a), resulting in a joint structure with excellent workability.

Patent No. 6375079 Patent No. 4727091

Figure 9(a) shows a schematic diagram of the stress transmission section where stress is transmitted between a pair of steel materials 1 via filler material 2 or filler material 2 and joint steel material 3 when a pull-out force A acts on steel material 1 in the axial direction of the members in the joint structure of Figure 8(a) (referred to as a "lap joint") and the joint structure of Figure 8(b) (referred to as a "joint using joint steel material").

Figure 9(b) is a diagram showing a schematic distribution of the displacement between steel material 1 and filler material 2 in the axial direction of steel material 1 when pull-out force A is applied. When pull-out force A is applied, the elongation of steel material 1 is concentrated in base portion B (see Figure 9(a)) of steel material 1 located at both ends of the stress transmission part. Therefore, the displacement is large at the positions corresponding to both ends of the stress transmission part and small between them, as shown in Figure 9(b).

In a normal joint structure, as shown in Figure 9(c), the rigidity against slippage between the steel material 1 and the filler material 2 (hereinafter referred to as slippage rigidity) is constant, so the bond stress (shear stress) that occurs between the steel material 1 and the filler material 2 due to the slippage is large at the positions corresponding to both ends of the stress transmission part and small between them, as shown in Figure 9(d), just like the slippage displacement.

As a result, in a joint structure having a stress transmission part as shown in Figure 9 (a), damage to the filler 2 progresses from both ends of the stress transmission part, and the joint reaches its maximum strength before the adhesion stress during that time reaches the adhesion strength of the filler 2. For this reason, in a normal joint structure, the adhesion performance of the material and structure itself cannot be fully demonstrated over the entire length of the joint, so a large joint length is required.

In addition to the fact that the joint length is long for the above reasons, the steel material 1 has a larger cross-sectional area than rebar, so in joint structures between steel materials 1, the joint length must be long to begin with. As a result, the amount of steel material used in the joint increases, which has a negative impact on workability and costs on site.

The present invention was made in consideration of the above problems, and aims to provide a joint structure etc. that can shorten the joint length.

A first invention for solving the above-mentioned problems is a joint structure for a pair of reinforcing materials, which has a stress transmission section in which stress is transmitted between the pair of reinforcing materials via a filler when a pull-out force in the axial direction of the member acts on the reinforcing materials, and the stress transmission section has a configuration for equalizing, in the axial direction of the member, the adhesion stress generated between the reinforcing material and the filler due to a slippage generated between the reinforcing material and the filler when the pull-out force acts, the reinforcing material is a structural steel, and the configuration is such that a protrusion is provided on the reinforcing material and embedded in the filler, making the rigidity against the slippage greater at a middle part of the stress transmission section in the axial direction of the member than at both ends in the axial direction of the member, and the protrusion includes a stud .
A second invention is a joint structure for a pair of reinforcing materials, the joint structure having a stress transmission section whereby stress is transmitted between the pair of reinforcing materials via a filler when a pull-out force in the axial direction of the member acts on the reinforcing materials, the stress transmission section having a configuration for equalizing, in the axial direction of the member, the adhesion stress generated between the reinforcing material and the filler due to a slippage generated between the reinforcing material and the filler when the pull-out force acts, the reinforcing material being a structural steel, the configuration being such that a protrusion portion is provided on the reinforcing material and embedded in the filler makes the rigidity against the slippage greater at a middle portion of the stress transmission section in the axial direction of the member than at both ends in the axial direction of the member, and the protrusion portion includes a perforated plate.
A third invention is a joint structure for a pair of reinforcing materials, the joint structure having a stress transmission section where stress is transmitted between the pair of reinforcing materials via a filler when a pull-out force in the axial direction of the member acts on the reinforcing materials, the stress transmission section having a configuration for equalizing, in the axial direction of the member, an adhesion stress generated between the reinforcing material and the filler due to a shift that occurs between the reinforcing material and the filler when the pull-out force acts, the reinforcing material being a structural steel, the configuration being such that, due to the cross-sectional area of the reinforcing material, the ease of stretching of the reinforcing material is greater at the tip side of the reinforcing material in the stress transmission section than at the root side of the reinforcing material in the stress transmission section, and an opening provided in the reinforcing material changes the cross-sectional area between the root side and the tip side of the reinforcing material in the stress transmission section.
A fourth invention is a joint structure for a pair of reinforcing materials, the joint structure having a stress transmission section where stress is transmitted between the pair of reinforcing materials via a filler when a pull-out force in the axial direction of the members acts on the reinforcing materials, the stress transmission section having a configuration for equalizing, in the axial direction of the members, the adhesion stress generated between the reinforcing material and the filler due to a shift generated between the reinforcing material and the filler when the pull-out force acts, the reinforcing material being a structural steel, and the configuration is such that, due to the material composition of the reinforcing material, the ease of stretching of the reinforcing material is greater at the tip side of the reinforcing material in the stress transmission section than at the root side of the reinforcing material in the stress transmission section.
A fifth invention is a joint structure for a pair of reinforcing materials, the joint structure having a stress transmission section where stress is transmitted between the pair of reinforcing materials via a filler when a pull-out force in the component axial direction acts on the reinforcing materials, the stress transmission section having a configuration for equalizing, in the component axial direction, the adhesion stress generated between the reinforcing material and the filler due to a slippage generated between the reinforcing material and the filler when the pull-out force acts, the configuration making the rigidity against the slippage greater at a middle part of the stress transmission section in the component axial direction than at both ends in the component axial direction, and the rigidity being due to the rigidity of the filler.

In the present invention, in a joint structure in which stress is transmitted between reinforcing materials via a filler, the adhesion stress caused by misalignment is made uniform within the stress transmission section, making the most of the stress transmission performance of the materials and structure of the joint structure itself, and eliminating the need to make the joint length longer than necessary. This allows the joint length to be shortened, improving workability on site and reducing costs.

In order to make the bond stress uniform, it is effective to make the shear stiffness of the middle part of the stress transfer part greater than that of both ends. This type of stiffness adjustment can be suitably achieved by the protrusions of the reinforcing material embedded in the filler as in the first and second inventions , or by the stiffness of the filler itself as in the fifth invention.

In order to make the bond stress uniform, it is also effective to make the stretchability of the reinforcing material greater at the tip side of the reinforcing material than at the base side of the reinforcing material in the stress transmission section. Such adjustment of the stretchability can be suitably achieved by adjusting the cross-sectional area and material composition of the reinforcing material , as in the third and fourth inventions .

The sixth invention is a joint structure for a pair of reinforcing materials, comprising a stress transmission part in which stress is transmitted between the pair of reinforcing materials via a filler when a pull-out force in the axial direction of the member acts on the reinforcing materials, the stress transmission part has a configuration for equalizing, in the axial direction of the member, the adhesion stress generated between the reinforcing material and the filler due to the shift generated between the reinforcing material and the filler when the pull-out force acts, and the stress transmission part is a joint structure in which the pair of reinforcing materials are overlapped so that the axial directions of the members are parallel, and the filler is filled between the reinforcing materials. Alternatively, the stress transmission part may be a joint structure in which a pair of reinforcing materials having the same axial direction of the member are butted together inside the joint material, and the filler is filled inside the joint material.
The joint structure of the present invention can be suitably applied to a lap joint between reinforcing materials, or to a joint using a joint material.

The present invention provides a joint structure that can shorten the joint length.

4A to 4C are diagrams illustrating the shear displacement, shear rigidity, and bond stress of a stress transmission part. FIG. 4 is a diagram for explaining the displacement of a stress transmission portion of a lap joint. An example of a stress transfer part in a joint structure. FIG. An example of a stress transfer part in a joint structure. 4A to 4C are diagrams illustrating the displacement and adhesion stress of a stress transmission portion. An example of a stress transfer part in a joint structure. An example of joint structure. 4A to 4C are diagrams illustrating the shear displacement, shear rigidity, and bond stress of a stress transmission part.

The following describes in detail a preferred embodiment of the present invention with reference to the drawings.

Figure 1(a) is a schematic diagram of the stress transmission portion of a joint structure of a pair of steel materials 1, similar to Figure 9(a) above.

The joint structure is, for example, the above-mentioned lap joint or a joint using joint steel material 3 (joint material). In the case of a lap joint, in the stress transmission section, a pair of steel materials 1 are overlapped so that the component axial directions of these steel materials 1 are parallel, and a filler material 2 is filled between the steel materials 1. In the case of a joint using joint steel material 3, in the stress transmission section, a pair of steel materials 1 with the component axial directions coaxial are butted together inside the joint steel material 3, and the inside of the joint steel material 3 is filled with a filler material 2.

In these stress transmission sections, when a pull-out force A acts on the steel material 1 in the component axial direction, stress (shear stress) is transmitted between the pair of steel materials 1 via the filler material 2 or via the filler material 2 and the joint steel material 3.

The steel material 1 is a reinforcing material for a structure (not shown), and in the stress transmission section, a pair of steel materials 1 are arranged with the member axial direction in the same direction (parallel or coaxial). The parts of the steel material 1 other than the stress transmission section are embedded in the concrete or the like of the structure. The steel material 1 is made of shaped steel such as flat steel or H-shaped steel, and the filler material 2 is made of cement-based materials such as concrete. However, the steel material 1 and the filler material 2 are not limited to these. For example, reinforcing bars or the like may be used instead of the steel material 1 as a reinforcing material.

Figure 1(b) is a diagram that, like Figure 9(b) above, shows a schematic distribution of the displacement between steel material 1 and filler material 2 in the axial direction of steel material 1 when pull-out force A is applied. As in Figure 1(b), in this embodiment, when pull-out force A is applied, the displacement increases at the positions that contact both ends of the stress transmission part. Note that the distribution in Figure 1(b) in the case of a lap joint is actually obtained as a combination of the displacements of each steel material 1 (1a, 1b) shown in Figure 2.

In this embodiment, as shown by symbol a in FIG. 1(c), different shear stiffness is given to the steel material 1 in response to the shear between the steel material 1 and the filler material 2 depending on the position in the axial direction of the steel material 1, and the bond stress (shear stress) generated between the steel material 1 and the filler material 2 in the stress transmission section is made uniform within the stress transmission section, as shown by symbol c in FIG. 1(d).

In other words, as shown in Figure 1(b), in the middle part of the member in the axial direction where the shear displacement is small, the shear stiffness is made relatively large to generate a large adhesion stress against the shear displacement, and in the both ends of the member in the axial direction where the shear displacement is large, the shear stiffness is made relatively small to prevent a large adhesion stress against the shear displacement.

As a result, as shown in Figure 1(d), the adhesion stress within the stress transmission section is homogenized and the value at each position in the axial direction of the component approaches a constant value, and the stress transmission performance of the material and structure itself can be fully demonstrated within the joint section, so there is no need to make the joint length longer than necessary.

Figures 3(a) to (c) show an example of a specific configuration for adjusting the shear stiffness. In this embodiment, for example, in the stress transmission part of a lap joint, a stud 4, which is a protrusion, is provided on the surface of the steel material 1, and the stud 4 is embedded in the filler material 2, and the shaft diameter, height, installation interval, etc. of the stud 4 are changed according to the position in the axial direction of the steel material 1. As a result, the shear stiffness of the middle part in the axial direction of the member is made greater in the stress transmission part than both ends in the axial direction of the member.

For example, as shown in the stress transmission section of Figure 3(a), by making the height of the stud 4 greater at the middle part in the axial direction of the component than at both ends in the axial direction of the component, the shear stiffness of the middle part in the axial direction of the component can be made greater than that of both ends in the axial direction of the component.

As shown in the stress transmission section of Figure 3(b), the spacing between the studs 4 can be made smaller (more studs installed, and more densely installed) in the middle of the component axial direction than at both ends in the axial direction, or as shown in Figure 3(c), even if the spacing and height of the studs 4 are the same, the shaft diameter of the studs 4 can be made larger in the middle of the component axial direction than at both ends in the axial direction, making the shear stiffness of the middle of the component axial direction greater than at both ends in the axial direction.

In addition, by using a perforated plate instead of the stud 4 as the protrusion and changing the hole diameter and spacing depending on the position in the axial direction of the steel material 1, it is possible to make the shear stiffness of the middle part of the stress transmission part in the axial direction of the member greater than both ends in the axial direction of the member.

For example, as shown in the stress transmission section using a perforated plate 5 in Figure 3(d), by making the hole spacing smaller (increasing the number of holes and increasing the hole density) in the middle part of the member's axial direction than at both ends in the axial direction, it is possible to make the shear stiffness of the middle part of the member's axial direction greater than at both ends in the axial direction. Also, as shown in Figure 3(e), even if the hole spacing is the same, by making the hole diameter larger in the middle part of the member's axial direction than at both ends, the same effect as above can be obtained.

In addition, since the shear rigidity of the perforated plate 5 is improved by passing rebars through the holes, the presence or absence of penetrating rebars, as well as the diameter and number of penetrating rebars, may be changed in the stress transmission section depending on the position in the axial direction of the steel material 1. For example, by providing penetrating rebars in the holes of the perforated plate 5 in the middle part in the axial direction of the member, but not providing penetrating rebars in the holes of the perforated plate 5 at both ends in the axial direction of the member, it is possible to make the shear rigidity of the middle part in the axial direction of the member greater than that of both ends in the axial direction of the member.

In addition, by changing the type of protrusion depending on the position in the axial direction of the steel material 1, it is possible to make the shear stiffness of the middle part of the stress transmission part in the axial direction of the member greater than both ends in the axial direction of the member.

For example, since the perforated plate 5 has a greater shear stiffness than the stud 4, by using a perforated plate 5 in the middle of the component axial direction and using studs 4 at both ends of the component axial direction, as shown in the stress transmission section of Figure 3(f), the shear stiffness of the middle of the component axial direction can be made greater than that of both ends of the component axial direction.

Figures 3(a) to (f) explain the specific configuration of the stress transmission part of the lap joint, but in addition to the examples shown here, the specifications of the studs 4 and perforated plates 5 (height, axial diameter of the studs 4, plate thickness of the perforated plate 5, spacing between the studs 4 and holes, etc.) may be arbitrarily combined. In particular, the slip resistance of each stud 4 and perforated plate 5 arranged in the joint section only needs to be large enough to withstand the uniformed adhesion stress, and it is preferable to set the specifications of the studs 4 and perforated plates 5 (height, axial diameter of the studs 4, plate thickness of the perforated plate 5, spacing between the studs 4 and holes, etc.) so that the slip stiffness of the middle part in the axial direction of the member can be made greater than both ends in the axial direction of the member without increasing the slip resistance more than necessary.

In addition, in the case of a joint using joint steel material 3, a configuration similar to that described above can be added to the steel material 1 of the stress transmission part and the joint steel material 3.

Figure 3(g) shows an example of the stress transmission part of a joint using joint steel material 3, where the configuration of Figure 3(b) is added to steel material 1 and joint steel material 3, and the installation interval of studs 4 is made smaller in the middle part in the axial direction of the members than at both ends in the axial direction of the members. In the example of Figure 3(g), studs 4 are provided on steel material 1 and joint steel material 3, but it is also possible to provide studs 4 only on steel material 1.

In this way, in this embodiment, by changing the specifications and type of the protrusion, it is possible to adjust the shear rigidity as shown in FIG. 1(c) and to equalize the adhesion stress generated within the stress transmission portion as shown in FIG. 1(d). This makes it possible to maximize the stress transmission performance of the materials and structure of the joint structure itself within the joint section, improving the joint strength, and eliminating the need to make the joint length longer than necessary. This allows the joint length to be shortened, improving workability on site and reducing costs. Furthermore, the stress transmission portion of this embodiment can be suitably applied to lap joints between steel materials 1 and joints using joint steel material 3.

In this embodiment, the shear stiffness is changed in stages as shown by the symbol a in FIG. 1(c), but there are no particular limitations on how the shear stiffness is adjusted, and it can be determined according to the performance required for the joint structure. For example, as shown by the symbol b in FIG. 1(c), the shear stiffness may be changed continuously from both ends in the axial direction of the member to the middle.

Also, the apparent rigidity of the studs 4 and perforated plates 5 may be changed by shifting the time when they exert their resistance against shearing. For example, Figures 4(a) and (b) show one example, in which low-rigidity buffer material 6 of a certain width W is provided around the shank of the stud 4 and on the inner edge of the hole 51 of the perforated plate 5, so that they exert their resistance (bear shearing force) only when a shearing displacement of that width W or more occurs.

The graph in Figure 4(c) shows the relationship between the above-mentioned slippage and resistance, with the horizontal axis representing slippage and the vertical axis representing the shear force generated by the stud 4 or perforated plate 5. By providing the cushioning material 6, as shown by the symbol I, the stud 4 or perforated plate 5 begins to bear the shear force only when the slippage exceeds the width W of the cushioning material 6.

This allows the apparent shear stiffness (the inclination of the line segment indicated by reference symbol II) of the studs 4 and perforated plate 5 to be lower than in the case indicated by reference symbol III where no buffer material 6 is provided. The buffer material 6 can be made of an elastic material such as rubber, but is not limited to this, and by selecting the width and stiffness of the buffer material 6, it becomes possible to adjust the apparent shear stiffness of the studs 4 and perforated plate 5.

Therefore, in this embodiment, it is also possible to change the shear stiffness of the stress transmission section by using the buffer material 6. For example, by not using the buffer material 6 for the studs 4 or perforated plates 5 in the middle section in the axial direction of the component, but using the buffer material 6 at both ends in the axial direction of the component, the shear stiffness of the middle section in the axial direction of the component can be made greater than that of both ends in the axial direction of the component. The buffer material 6 may also be replaced with an air gap, which can achieve the same effect.

As described above, the adjustment of the shear stiffness can be suitably achieved by using protrusions such as studs 4 and perforated plates 5 embedded in the filler 2, but it can also be suitably achieved by using the elastic modulus (rigidity) of the filler 2.

For example, as shown in Figure 5, in the stress transmission section of a joint using joint steel 3, the elastic modulus of the filler 2 is changed according to the position in the axial direction of the steel 1, and a relatively high-rigidity filler 2a is used in the middle section in the axial direction of the member, while a lower-rigidity filler 2b is used at both ends in the axial direction of the member. This makes it possible to make the shear rigidity of the middle section in the axial direction of the member greater than that of both ends in the axial direction of the member.

The elastic modulus of the filler 2 can be adjusted in combination with the adjustment of the shear stiffness using the protrusions (studs 4 and perforated plates 5) described above, and can also be performed at the stress transmission part of the lap joint.

Second Embodiment
FIG. 6(a) is a schematic diagram of a stress transmission section in a joint structure in which stress is transmitted between steel materials 1 via a filler material 2 or via a filler material 2 and a joint steel material 3, as in FIG. 1(a) described above. In this embodiment, however, the slippage displacement when a pull-out force A acts on the steel material 1 in the axial direction of the member is made more uniform, as shown by symbol e in FIG. 6(b), than in the case of FIG. 1(b) (see symbol f).

This also makes it possible to equalize the adhesion stress that occurs between the steel material 1 and the filler material 2 in the stress transmission section, as shown in Figure 6 (c). Note that the shear stiffness is assumed to be constant in the axial direction of the steel material 1 in the stress transmission section.

Figure 7 (a) is an example of a specific configuration for equalizing the shear displacement as shown in Figure 6 (b). In this embodiment, the shear displacement is equalized by adjusting the stretchability of the steel material 1 (the amount of stretch for the same pulling force), and the adjustment of the stretchability is achieved by the cross-sectional area of the steel material 1. In other words, the cross-sectional area of the steel material 1 in the stress transmission section is gradually reduced from the base side portion B to the tip side portion, making the steel material 1 more stretchable toward the tip of the steel material 1.

As a result, as described above, it is possible to avoid concentration of elongation at the base portion B of the steel material 1, to equalize the shear displacement as shown in FIG. 6(b), and to equalize the bond stress within the stress transmission portion as shown in FIG. 6(c). In order to equalize the bond stress, it is effective to adjust the shear stiffness as in the first embodiment, but it is also effective to adjust the ease of elongation of the steel material 1 as in this embodiment, and the same effect as the first embodiment can be obtained.

The specific configuration for adjusting the stretchability of the steel material 1 is not particularly limited, and it is sufficient that the stretchability of the steel material 1 is greater at the tip side portion of the steel material 1 than at the base side portion B. For example, when changing the cross-sectional area of the steel material 1, it is possible to change the cross-sectional area by providing openings 11 on the plate surface of the steel material 1 as shown in FIG. 7(b) and adjusting the size and number of the openings 11. In addition, as a specific configuration for adjusting the stretchability, the material composition of the steel material 1 may be changed, or a separate processing process may be added when the steel material 1 is manufactured. In addition, the adjustment of the stretchability of the steel material 1 can be used in combination with the adjustment of the shear stiffness described in the first embodiment. In the case of FIG. 7(b), the openings 11 can be expected to function as a slip prevention function between the filler material 2 and the steel material 1, and by adjusting the size and arrangement of the openings 11, it is possible to increase the stretchability while also performing the function of adjusting the shear stiffness.

The above describes preferred embodiments of the present invention with reference to the attached drawings, but the present invention is not limited to these examples. It is clear that a person skilled in the art can come up with various modified or revised examples within the scope of the technical ideas disclosed in this application, and it is understood that these also naturally fall within the technical scope of the present invention.

1: Steel material 2: Filler material 3: Joint steel material 4: Stud 5: Perforated plate 6: Cushioning material

Claims (7)

A joint structure for a pair of reinforcing members,
a stress transmission portion in which stress is transmitted between the pair of reinforcing materials via a filler when a pull-out force in a member axial direction acts on the reinforcing material,
The stress transmission portion has a configuration for equalizing, in the member axial direction, an adhesive stress generated between the reinforcing material and the filler due to a shift generated between the reinforcing material and the filler when the pull-out force is applied,
The reinforcing material is a structural steel,
The configuration is such that a protrusion portion provided on the reinforcing material and embedded in the filler material makes the rigidity against the displacement greater at a middle portion of the stress transmission portion in the member axial direction than at both ends of the stress transmission portion in the member axial direction,
A joint structure , characterized in that the protrusion includes a stud . A joint structure for a pair of reinforcing members,
a stress transmission portion in which stress is transmitted between the pair of reinforcing materials via a filler when a pull-out force in a member axial direction acts on the reinforcing material,
The stress transmission portion has a configuration for equalizing, in the member axial direction, an adhesive stress generated between the reinforcing material and the filler due to a shift generated between the reinforcing material and the filler when the pull-out force is applied,
The reinforcing material is a structural steel,
The configuration is such that a protrusion portion provided on the reinforcing material and embedded in the filler material makes the rigidity against the displacement greater at a middle portion of the stress transmission portion in the member axial direction than at both ends of the stress transmission portion in the member axial direction,
A joint structure , characterized in that the protrusion portion includes a perforated plate . A joint structure for a pair of reinforcing members,
a stress transmission portion in which stress is transmitted between the pair of reinforcing materials via a filler when a pull-out force in a member axial direction acts on the reinforcing material,
The stress transmission portion has a configuration for equalizing, in the member axial direction, an adhesive stress generated between the reinforcing material and the filler due to a shift generated between the reinforcing material and the filler when the pull-out force is applied,
The reinforcing material is a structural steel,
The configuration is such that the stretchability of the reinforcing material is made larger at a tip side of the reinforcing material in the stress transmission portion than at a root side of the reinforcing material in the stress transmission portion due to a cross-sectional area of the reinforcing material,
A joint structure, characterized in that the cross-sectional area is changed between the root side and the tip side of the reinforcing material in the stress transmission portion by an opening provided in the reinforcing material . A joint structure for a pair of reinforcing members,
a stress transmission portion in which stress is transmitted between the pair of reinforcing materials via a filler when a pull-out force in a member axial direction acts on the reinforcing material,
The stress transmission portion has a configuration for equalizing, in the member axial direction, an adhesive stress generated between the reinforcing material and the filler due to a shift generated between the reinforcing material and the filler when the pull-out force is applied,
The reinforcing material is a structural steel,
The above-mentioned configuration is a joint structure characterized in that the material composition of the reinforcing material makes the reinforcing material more susceptible to stretching at the tip side of the reinforcing material in the stress transmission portion than at the root side of the reinforcing material in the stress transmission portion . 5. The joint structure according to claim 1, wherein the stress transmission portion is formed by arranging a pair of the reinforcing members coaxially in a member axial direction so as to butt together inside the joint material, and filling the inside of the joint material with the filler material. A joint structure for a pair of reinforcing members,
a stress transmission portion in which stress is transmitted between the pair of reinforcing materials via a filler when a pull-out force in a member axial direction acts on the reinforcing material,
The stress transmission portion has a configuration for equalizing, in the member axial direction, an adhesive stress generated between the reinforcing material and the filler due to a shift generated between the reinforcing material and the filler when the pull-out force is applied,
The configuration of this joint structure makes the rigidity against the misalignment greater at the middle part of the stress transmission part in the axial direction of the member than at both ends in the axial direction of the member, and is characterized in that this is due to the rigidity of the filler material. A joint structure for a pair of reinforcing members,
a stress transmission portion in which stress is transmitted between the pair of reinforcing materials via a filler when a pull-out force in a member axial direction acts on the reinforcing material,
The stress transmission portion has a configuration for equalizing, in the member axial direction, an adhesive stress generated between the reinforcing material and the filler due to a shift generated between the reinforcing material and the filler when the pull-out force is applied,
A joint structure characterized in that the stress transmission portion is formed by stacking a pair of the reinforcing materials so that the axial directions of the members are parallel to each other, and filling the space between the reinforcing materials with the filler material.

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