Joint structure

Abstract

To provide a joint structure capable of shortening a joint length.SOLUTION: A joint structure of a pair of steel materials 1 has a stress transmission unit which performs stress transmission between the pair of steel materials 1 via a filling material 2 when pull-out force in the member axial direction acts on the steel materials 1, and the stress transmission unit is provided with a configuration for equalizing adhesive stress in the member axial direction of the steel materials 1, the adhesive stress occurring between the steel materials 1 and the filling material 2 with deviation occurring between the steel materials 1 and the filling material 2. This configuration increases rigidity against deviation at a middle part of the stress transmission unit in the member axial direction greater than at both ends in the member axial direction, and can be achieved by, for example, a protrusion part provided on the steel materials 1 and embedded into the filling material 2.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a joint structure.

Background Art

[0002] In an SC (steel-concrete) structure, a pair of steel materials are joined by welding or bolt connection. However, such a joining structure has problems such as a large amount of on-site work and management items, and it cannot be constructed depending on the construction conditions.

[0003] On the other hand, there is also a structure that forms a joint structure similar to a lap joint of reinforcing bars by performing stress transmission between a pair of steel materials through a filler. For example, as shown in Fig. 8(a), by arranging a pair of steel materials 1 in the filler 2 so that the member axial directions are parallel, stress transmission between the steel materials 1 through the filler 2 becomes possible, and the on-site work required for the construction of the joint structure can be significantly reduced (see Patent Document 1, etc.).

[0004] Also, as shown in Fig. 8(b), it is also conceivable to arrange a pair of steel materials 1 having coaxial member axial directions in contact with each other inside a cylindrical joint steel material 3 which is a joint member, and fill the inside of the joint steel material 3 with a filler 2, enabling stress transmission between the steel materials 1 through the filler 2 and the joint steel material 3 (see Patent Document 2, etc.). In this case, due to the restraining effect of the joint steel material 3, the joint length can be shortened compared to the joint structure of Fig. 8(a), resulting in a joint structure with excellent constructability.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] Fig. 9(a) schematically shows a stress transmission portion where stress transmission occurs between a pair of steel materials 1 via a filler 2 or the filler 2 and a joint steel material 3 when a tensile force A in the member axial direction acts on the steel material 1 in the joint structure of Fig. 8(a) (referred to as "overlapping joint") and the joint structure of Fig. 8(b) (referred to as "joint using joint steel material").

[0007] Fig. 9(b) is a diagram schematically showing the distribution in the member axial direction of the steel material 1 regarding the displacement due to the slip between the steel material 1 and the filler 2 when the tensile force A acts. When the tensile force A acts, the elongation of the steel material 1 concentrates on the root side portion B (see Fig. 9(a)) of the steel material 1 located at both ends of the stress transmission portion. Therefore, as shown in Fig. 9(b), the displacement due to slip is large at the positions corresponding to both ends of the stress transmission portion and small in between.

[0008] In a normal joint structure, as shown in Fig. 9(c), since the rigidity against the slip between the steel material 1 and the filler 2 (hereinafter referred to as slip rigidity) is constant, the adhesive stress (shearing stress) generated between the steel material 1 and the filler 2 due to the slip, similar to the displacement due to slip, becomes large at the positions corresponding to both ends of the stress transmission portion as shown in Fig. 9(d) and small in between.

[0009] As a result, in a joint structure having a stress transmission portion as shown in Fig. 9(a), damage to the filler 2 progresses from both ends of the stress transmission portion, and before the adhesive stress in between reaches the adhesive strength of the filler 2, the maximum bearing capacity of the joint is reached. Therefore, in a normal joint structure, the adhesion performance inherent in the material and structure itself cannot be fully exerted over the entire length of the joint, so a large joint length is required.

[0010] In addition to the joint length becoming long due to the above reasons in the joint structure, since the cross-sectional area of the steel material 1 is larger than that of the reinforcing bar, in the joint structure between the steel materials 1, it is necessary to originally make the joint length long. As a result, the amount of steel material used for the joint increases, which has an adverse effect on the workability and cost at the site.

[0011] The present invention has been made in view of the above problems, and an object thereof is to provide a joint structure and the like that can shorten the joint length.

Means for Solving the Problem

[0012] The first invention for solving the above-described problem is a joint structure of a pair of reinforcing members, which has a stress transmission portion where stress transmission through a filler is performed between the pair of reinforcing members when an axial pulling force of the member acts on the reinforcing member, and the stress transmission portion has a configuration for equalizing the adhesion stress generated between the reinforcing member and the filler along with the displacement generated between the reinforcing member and the filler when the pulling force acts, in the axial direction of the member, and the reinforcing member is a shaped steel Further, the structure is provided on the reinforcing member and includes protrusions embedded in the filler material, which increases the rigidity against the displacement at the middle portion in the member axis direction of the stress transmission portion more than at both end portions in the member axis direction, and the protrusions include studs. It is a joint structure characterized by this. A second invention is a joint structure for a pair of reinforcing members, having a stress transmission portion in which stress transmission through a filler material occurs between the pair of reinforcing members when an axial pulling force acts on the reinforcing members. The stress transmission portion includes a structure for equalizing the adhesive stress generated between the reinforcing member and the filler material due to the displacement occurring between the reinforcing member and the filler material when the pulling force acts, in the member axis direction. The reinforcing member is a shaped steel. The structure is provided on the reinforcing member and includes protrusions embedded in the filler material, which increases the rigidity against the displacement at the middle portion in the member axis direction of the stress transmission portion more than at both end portions in the member axis direction, and the protrusions include perforated plates. The joint structure is characterized by this. A third invention is a joint structure for a pair of reinforcing members, having a stress transmission portion in which stress transmission through a filler material occurs between the pair of reinforcing members when an axial pulling force acts on the reinforcing members. The stress transmission portion includes a structure for equalizing the adhesive stress generated between the reinforcing member and the filler material due to the displacement occurring between the reinforcing member and the filler material when the pulling force acts, in the member axis direction. The reinforcing member is a shaped steel. The structure makes the reinforcing member more likely to elongate at the tip side of the reinforcing member in the stress transmission portion than at the root side of the reinforcing member in the stress transmission portion, according to the cross-sectional area of the reinforcing member, and is a joint structure characterized by changing the cross-sectional area between the root side and the tip side of the reinforcing member in the stress transmission portion by means of an opening provided in the reinforcing member. The fourth invention is a joint structure of a pair of reinforcing members, which has a stress transmission portion where stress transmission through a filler is performed between the pair of reinforcing members when a drawing force in the member axial direction acts on the reinforcing members. The stress transmission portion is configured to equalize the adhesive stress generated between the reinforcing member and the filler along with the displacement generated between the reinforcing member and the filler when the drawing force acts, in the member axial direction. The reinforcing member is a shaped steel, and the configuration is such that, due to the material composition of the reinforcing member, the ease of elongation of the reinforcing member is made greater at the tip side of the reinforcing member in the stress transmission portion than at the root side of the reinforcing member in the stress transmission portion. It is a joint structure characterized by this. The 5 second invention is a joint structure of a pair of reinforcing members, which has a stress transmission portion where stress transmission through a filler is performed between the pair of reinforcing members when an axial pulling force of the member acts on the reinforcing member, and the stress transmission portion has a configuration for equalizing the adhesion stress generated between the reinforcing member and the filler along with the displacement generated between the reinforcing member and the filler when the pulling force acts, in the axial direction of the member, and the configuration is such that the rigidity against the displacement is made larger at the intermediate portion in the axial direction of the stress transmission portion than at both ends in the axial direction of the member, and it is characterized by being due to the rigidity of the filler. It is a joint structure.

[0013] In the present invention, in a joint structure in which stress transmission through a filler is performed between reinforcing members, by equalizing the adhesion stress accompanying displacement within the stress transmission portion, the stress transmission performance of the material and structure of the joint structure itself is maximally utilized, and it is not necessary to make the joint length longer than necessary. Therefore, the joint length can be shortened, the workability at the site is improved, and the cost can be reduced.

[0014] Attachment In order to equalize the adhesion stress, it is effective to make the displacement rigidity of the intermediate portion of the stress transmission portion larger than that of both ends. Such adjustment of rigidity is As in the first and second inventions the protrusions of the reinforcing member embedded in the filler, and the second5 can be preferably realized by the rigidity of the filler itself as in the invention.

[0015] Attachment In order to equalize the contact stress, it is also effective to make the reinforcing member more easily extensible at the tip side of the reinforcing member than at the root side in the stress transmission part. Such adjustment of the ease of extension can be preferably realized by As in the third and fourth inventions the cross-sectional area of the reinforcing member and material composition and is preferably realized thereby.

[0016] The 6 invention is a joint structure of a pair of reinforcing members, which has a stress transmission part where stress transmission through a filler occurs between the pair of reinforcing members when an axial pulling force acts on the reinforcing members. The stress transmission part has a configuration for equalizing the adhesion stress generated between the reinforcing member and the filler along with the displacement generated between the reinforcing member and the filler when the pulling force acts, in the axial direction of the member. The stress transmission part is a joint structure characterized in that a pair of the reinforcing members are arranged overlappingly so that the axial directions of the members are parallel, and the filler is filled between the reinforcing members. Alternatively, the stress transmission part may be such that a pair of the reinforcing members having coaxial axial directions are butted against each other inside a joint member, and the filler is filled inside the joint member. The joint structure of the present invention can be preferably applied to both the overlapping joint of the reinforcing members and the joint using a joint member.

Advantages of the Invention

[0017] According to the present invention, a joint structure or the like capable of shortening the joint length can be provided.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Mode for Carrying Out the Invention

[0019] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[0020] FIG. 1(a) schematically shows the stress transmission part of the joint structure of a pair of steel materials 1, similar to FIG. 9(a) described above.

[0021] The joint structure is, for example, the above-described lap joint or a joint using a joint steel material 3 (joint material). In the case of a lap joint, in the stress transmission part, a pair of steel materials 1 are arranged so that the axial directions of these steel materials 1 are parallel, and a filler 2 is filled between the steel materials 1. In the case of a joint using a joint steel material 3, in the stress transmission part, a pair of steel materials 1 with coaxial axial directions are butted and arranged inside the joint steel material 3, and the filler 2 is filled inside the joint steel material 3.

[0022] In these stress transmission parts, when a tensile force A in the axial direction of the member acts on the steel material 1, stress (shearing stress) is transmitted between the pair of steel materials 1 through the filler 2 or the filler 2 and the joint steel material 3.

[0023] The steel material 1 is a reinforcing material for a structure (not shown). In the stress transmission part, a pair of steel materials 1 are arranged with the member axis directions in the same direction (parallel or coaxial). The parts of the steel material 1 other than the stress transmission part are embedded in the concrete or the like of the structure. As the steel material 1, shaped steel such as flat steel or H-shaped steel is used, and as the filling material 2, a cement-based material such as concrete is used. However, the steel material 1 and the filling material 2 are not limited to these. For example, steel bars or the like may be used instead of the steel material 1 as the reinforcing material.

[0024] FIG. 1(b) is a diagram schematically showing the distribution in the member axis direction of the steel material 1 with respect to the displacement between the steel material 1 and the filling material 2 when the pulling force A acts, similar to FIG. 9(b) described above. As shown in FIG. 1(b), also in this embodiment, when the pulling force A acts, the displacement becomes large at the positions corresponding to both ends of the stress transmission part. Note that the distribution in FIG. 1(b) in the case of the lap joint is actually obtained by synthesizing the displacements of the respective steel materials 1 (1a, 1b) shown in FIG. 2.

[0025] Here, in this embodiment, as shown by reference sign a in FIG. 1(c), by giving different displacement rigidities according to the position in the member axis direction of the steel material 1 with respect to the displacement between the steel material 1 and the filling material 2, as shown by reference sign c in FIG. 1(d), the adhesive stress (shearing stress) generated between the steel material 1 and the filling material 2 in the stress transmission part is made uniform within the stress transmission part.

[0026] That is, as shown in FIG. 1(b), in the intermediate part in the member axis direction where the displacement is small, by relatively increasing the displacement rigidity, a large adhesive stress is generated with respect to the displacement, and at both ends in the member axis direction where the displacement is large, by relatively decreasing the displacement rigidity, a large adhesive stress is not generated with respect to the displacement.

[0027] As a result, as shown in FIG. 1(d), the adhesive stress within the stress transmission part is made uniform and the values at each position in the member axis direction approach a constant value, so that the stress transmission performance of the material and the structure itself can be sufficiently exhibited within the joint section, and it is not necessary to make the joint length larger than necessary.

[0028] Figs. 3(a) to 3(c) are an example of a specific configuration for adjusting the displacement stiffness. In this embodiment, for example, in the stress transmission part of the lap joint, studs 4, which are protrusions, are provided on the surface of the steel material 1, the studs 4 are embedded in the filler material 2, and the shaft diameter, height, installation interval, etc. of the studs 4 are changed according to the position in the axial direction of the member of the steel material 1. Thereby, in the stress transmission part, the displacement stiffness of the middle part in the axial direction of the member is made larger than that of both end parts in the axial direction of the member.

[0029] For example, as shown in the stress transmission part of Fig. 3(a), by making the height of the studs 4 larger in the middle part in the axial direction of the member than at both end parts in the axial direction of the member, the displacement stiffness of the middle part in the axial direction of the member can be made larger than that of both end parts in the axial direction of the member.

[0030] Also, as shown in the stress transmission part of Fig. 3(b), in the middle part in the axial direction of the member, the installation interval of the studs 4 is made smaller (the number of installations is increased and the installation density is increased) than at both end parts in the axial direction of the member, or as shown in Fig. 3(c), even if the installation interval and height of the studs 4 are the same, by making the shaft diameter of the studs 4 larger in the middle part in the axial direction of the member than at both end parts, it is also possible to make the displacement stiffness of the middle part in the axial direction of the member larger than that of both end parts in the axial direction of the member.

[0031] Also, instead of the studs 4, a perforated plate is used as the protrusion, and by changing the diameter and interval of the holes, etc. according to the position in the axial direction of the member of the steel material 1, it is also possible to make the displacement stiffness of the middle part in the axial direction of the member larger than that of both end parts in the axial direction of the member in the stress transmission part.

[0032] For example, as shown in the stress transmission part using the perforated plate 5 in Fig. 3(d), by making the interval between the holes smaller (the number of holes is increased and the density of the holes is increased) in the middle part in the axial direction of the member than at both end parts in the axial direction of the member, it is possible to make the displacement stiffness of the middle part in the axial direction of the member larger than that of both end parts in the axial direction of the member. Also, as shown in Fig. 3(e), even if the interval between the holes is the same, by making the diameter of the holes larger in the middle part in the axial direction of the member than at both end parts, the same effect as above can be obtained.

[0033] Also, in the perforated plate 5, the displacement rigidity is improved by passing reinforcing bars through the holes. Therefore, in the stress transmission part, the presence or absence of the penetrating reinforcing bars, the diameter and the number of the penetrating reinforcing bars may be changed according to the position in the member axis direction of the steel material 1. For example, penetrating reinforcing bars are provided in the holes of the perforated plate 5 at the middle part in the member axis direction, but not provided in the holes of the perforated plate 5 at both ends in the member axis direction, so that the displacement rigidity at the middle part in the member axis direction can be made larger than that at both ends in the member axis direction.

[0034] In addition, by changing the type of the protrusion according to the position in the member axis direction of the steel material 1, it is also possible to make the displacement rigidity at the middle part in the member axis direction larger than that at both ends in the member axis direction in the stress transmission part.

[0035] For example, since the perforated plate 5 has a larger displacement rigidity than the stud 4, as shown in the stress transmission part of Fig. 3(f), the perforated plate 5 is used at the middle part in the member axis direction, and the stud 4 is used at both ends in the member axis direction, so that the displacement rigidity at the middle part in the member axis direction can be made larger than that at both ends in the member axis direction.

[0036] Figs. 3(a) to (f) illustrate the specific configuration of the stress transmission part of the lap joint. However, in addition to the examples shown here, the specifications of the stud 4 and the perforated plate 5 (height, shaft diameter of the stud 4, plate thickness of the perforated plate 5, spacing between the stud 4 and the holes, etc.) may be arbitrarily combined. In particular, the displacement resistance of each stud 4 and perforated plate 5 arranged in the joint section only needs to be large enough to withstand the uniform adhesion stress. Without increasing the displacement resistance more than necessary, it is preferable to set the specifications of the stud 4 and the perforated plate 5 (height, shaft diameter of the stud 4, plate thickness of the perforated plate 5, spacing between the stud 4 and the holes, etc.) so that the displacement rigidity at the middle part in the member axis direction can be made larger than that at both ends in the member axis direction.

[0037] In addition, in the case of a joint using the joint steel material 3, the same configuration as the configuration described above can be added to the steel material 1 and the joint steel material 3 of the stress transmission part.

[0038] FIG. 3(g) shows an example in which, for the stress transmission portion of the joint using the joint steel material 3, the configuration of FIG. 3(b) is added to the steel material 1 and the joint steel material 3, and the installation interval of the studs 4 is made smaller at the intermediate portion in the member axial direction than at both end portions in the member axial direction. In the example of FIG. 3(g), the studs 4 are provided on both the steel material 1 and the joint steel material 3, but it is also possible to provide the studs 4 only on the steel material 1.

[0039] As described above, in the present embodiment, by changing the specifications and types of the protrusions, it is possible to adjust the displacement rigidity as shown in FIG. 1(c) and to equalize the adhesion stress generated in the stress transmission portion as shown in FIG. 1(d). Thereby, the stress transmission performance of the material and structure of the joint structure itself is maximally utilized within the joint section, and by improving the joint strength, it is not necessary to make the joint length longer than necessary. Therefore, the joint length can be shortened, the workability at the site is improved, and the cost can be reduced. Further, the stress transmission portion of the present embodiment can be suitably applied to both the lap joint of the steel materials 1 and the joint using the joint steel material 3.

[0040] In the present embodiment, the displacement rigidity is changed stepwise as indicated by the reference sign a in FIG. 1(c), but how to adjust the displacement rigidity is not particularly limited and can be determined according to the performance required for the joint structure and the like. For example, as indicated by the reference sign b in FIG. 1(c), the displacement rigidity may be continuously changed from both end portions in the member axial direction toward the intermediate portion.

[0041] Further, for the studs 4 and the perforated plate 5, the apparent rigidity may be changed by shifting the timing at which the resistance to displacement is exerted. For example, FIGS. 4(a) and (b) show an example in which a buffer material 6 having a low rigidity with a predetermined width W is provided around the shaft portion of the stud 4 or at the inner edge of the hole 51 of the perforated plate 5, so that the resistance (bearing the shear force) is exerted only when the displacement displacement exceeding the width W occurs.

[0042] The relationship between the above-mentioned displacement and the resistance force is shown in the graph of Fig. 4(c), with the displacement on the horizontal axis and the shear force generated by the stud 4 or the perforated plate 5 on the vertical axis. By providing the buffer material 6, as shown by symbol I, the stud 4 and the perforated plate 5 begin to bear the shear force only when the displacement exceeds the width W of the buffer material 6.

[0043] As a result, the apparent displacement rigidity (the slope of the line segment indicated by symbol II) of the stud 4 and the perforated plate 5 can be reduced compared to the case of symbol III without the buffer material 6. An elastic body such as rubber can be used for the buffer material 6, but it is not limited thereto. By selecting the width and rigidity of the buffer material 6, it becomes possible to adjust the apparent displacement rigidity of the stud 4 and the perforated plate 5.

[0044] Therefore, in this embodiment, it is also possible to change the displacement rigidity of the stress transmission part by using the buffer material 6. For example, in the middle part in the axial direction of the member, the buffer material 6 is not used for the stud 4 and the perforated plate 5, and the buffer material 6 is used at both ends in the axial direction of the member, so that the displacement rigidity in the middle part in the axial direction of the member can be made larger than that at both ends in the axial direction of the member. The buffer material 6 may be replaced with a void, and the same effect can be obtained thereby.

[0045] As described above, the adjustment of the displacement rigidity can be preferably realized by protrusions such as the stud 4 and the perforated plate 5 embedded in the filling material 2. In addition, it can also be preferably realized by the elastic modulus (rigidity) of the filling material 2.

[0046] For example, as shown in Fig. 5, in the stress transmission part of the joint using the joint steel material 3, the elastic modulus of the filling material 2 is changed according to the position in the axial direction of the steel material 1. The relatively high-rigidity filling material 2a is used in the middle part in the axial direction of the member, and the lower-rigidity filling material 2b is used at both ends in the axial direction of the member. Thereby, the displacement rigidity in the middle part in the axial direction of the member can be made larger than that at both ends in the axial direction of the member.

[0047] The adjustment of the elastic modulus of the filler 2 can be used in combination with the adjustment of the displacement rigidity by the above-described protrusions (studs 4 and perforated plates 5), and can also be performed in the stress transmission portion of the lap joint.

[0048] [Second Embodiment] FIG. 6(a) schematically shows a stress transmission portion in which stress is transmitted between the steel materials 1 through the filler 2 or the filler 2 and the joint steel material 3 in the joint structure, similar to FIG. 1(a) described above. In this embodiment, when a pulling force A in the member axial direction acts on the steel material 1, the displacement due to displacement is made more uniform than in the case of FIG. 1(b) (refer to the reference symbol f), as shown by the reference symbol e in FIG. 6(b).

[0049] Also by this, as shown in FIG. 6(c), the adhesive stress generated between the steel material 1 and the filler 2 in the stress transmission portion can be made uniform within the stress transmission portion. It is assumed that the displacement rigidity is constant in the member axial direction of the steel material 1 within the stress transmission portion.

[0050] FIG. 7(a) shows an example of a specific configuration for making the displacement due to displacement uniform as shown in FIG. 6(b). In this embodiment, the displacement due to displacement is made uniform by adjusting the ease of elongation of the steel material 1 (the amount of elongation with respect to the same pulling force), and the adjustment of the ease of elongation is realized by the cross-sectional area of the steel material 1. That is, the cross-sectional area of the steel material 1 in the stress transmission portion is gradually reduced from the root side portion B toward the tip side portion, and the steel material 1 is made easier to elongate toward the tip of the steel material 1.

[0051] Thereby, as described above, it is possible to avoid the concentration of elongation in the root side portion B of the steel material 1, make the displacement due to displacement uniform as shown in FIG. 6(b), and make the adhesive stress uniform within the stress transmission portion as shown in FIG. 6(c). To make the adhesive stress uniform, it is effective to adjust the displacement rigidity 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 in the first embodiment can be obtained.

[0052] Note that the specific configuration for realizing the adjustment of the ease of elongation of the steel material 1 is not particularly limited. As long as the ease of elongation of the steel material 1 is made greater than that of the base side portion B at the tip side portion of the steel material 1. For example, when changing the cross-sectional area of the steel material 1, it is also possible to provide an opening 11 on the plate surface of the steel material 1 as shown in Fig. 7(b), and change the cross-sectional area by adjusting the size and number of the openings 11. Further, as a specific configuration for realizing the adjustment of the ease of elongation, the material composition of the steel material 1 may be changed, or separate processing may be applied during the production of the steel material 1. Further, the adjustment of the ease of elongation of the steel material 1 can also be used in combination with the adjustment of the displacement rigidity described in the first embodiment. Also, in the case of Fig. 7(b), it can be expected that the opening 11 will function as a displacement stopper between the filler 2 and the steel material 1, and by adjusting its size and arrangement, it is possible to increase the ease of elongation while also having the function of adjusting the displacement rigidity.

[0053] As described above, the preferred embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that those skilled in the art can conceive of various modification examples or correction examples within the scope of the technical idea disclosed in this application, and it is naturally understood that those also belong to the technical scope of the present invention.

Explanation of Reference Numerals

[0054] 1: Steel material 2: Filler 3: Joint steel material 4: Stud 5: Perforated plate 6: Buffer material

Claims

1. A joint structure for a pair of reinforcing members, having a stress transmission portion where stress transmission through a filler occurs between the pair of reinforcing members when an axial pulling force acts on the reinforcing members, the stress transmission portion being configured to equalize the adhesive stress generated between the reinforcing member and the filler along with the displacement generated between the reinforcing member and the filler when the pulling force acts, in the axial direction of the member, the reinforcing member being a shaped steel, the configuration being such that the rigidity against the displacement is made greater at the middle portion in the axial direction of the stress transmission portion than at both end portions in the axial direction of the member by means of protrusions provided on the reinforcing member and embedded in the filler, the joint structure being characterized in that the protrusions include studs.

2. A joint structure for a pair of reinforcing members, having a stress transmission portion where stress transmission through a filler occurs between the pair of reinforcing members when an axial pulling force acts on the reinforcing members, the stress transmission portion being configured to equalize the adhesive stress generated between the reinforcing member and the filler along with the displacement generated between the reinforcing member and the filler when the pulling force acts, in the axial direction of the member, the reinforcing member being a shaped steel, the configuration being such that the rigidity against the displacement is made greater at the middle portion in the axial direction of the stress transmission portion than at both end portions in the axial direction of the member by means of protrusions provided on the reinforcing member and embedded in the filler, the joint structure being characterized in that the protrusions include perforated plates.

3. A joint structure for a pair of reinforcing members, having a stress transmission portion where stress transmission through a filler occurs between the pair of reinforcing members when an axial pulling force acts on the reinforcing members, the stress transmission portion being configured to equalize the adhesive stress generated between the reinforcing member and the filler along with the displacement generated between the reinforcing member and the filler when the pulling force acts, in the axial direction of the member, the reinforcing member being a shaped steel, the configuration being such that the ease of elongation of the reinforcing member is made greater at the tip side of the reinforcing member in the stress transmission portion than at the root side of the reinforcing member in the stress transmission portion by the cross-sectional area of the reinforcing member, the joint structure being characterized in that the cross-sectional area is changed between the root side and the tip side of the reinforcing member in the stress transmission portion by an opening provided in the reinforcing member.

4. A joint structure for a pair of reinforcing members, When a tensile force in the member axial direction acts on the reinforcing member, it has a stress transmission portion where stress transmission through the filler is performed between the pair of reinforcing members. The stress transmission portion includes a configuration for equalizing the adhesive stress generated between the reinforcing member and the filler along with the displacement generated between the reinforcing member and the filler when the tensile force acts, in the member axial direction. The reinforcing member is a shaped steel. The joint structure is characterized in that the configuration makes the reinforcing member more easily stretchable at the tip side of the reinforcing member in the stress transmission portion than at the root side of the reinforcing member in the stress transmission portion, depending on the material composition of the reinforcing member.

5. The stress transmission portion is configured such that a pair of the reinforcing members coaxial in the member axial direction are abutted and arranged inside a joint member, and the filler is filled inside the joint member. The joint structure according to any one of Claims 1 to 4, characterized by this.

6. A joint structure of a pair of reinforcing members, When a tensile force in the member axial direction acts on the reinforcing member, it has a stress transmission portion where stress transmission through the filler is performed between the pair of reinforcing members. The stress transmission portion includes a configuration for equalizing the adhesive stress generated between the reinforcing member and the filler along with the displacement generated between the reinforcing member and the filler when the tensile force acts, in the member axial direction. The joint structure is characterized in that the configuration makes the rigidity against the displacement larger at the middle portion in the member axial direction of the stress transmission portion than at both end portions in the member axial direction, and this is due to the rigidity of the filler.

7. A joint structure of a pair of reinforcing members, When a tensile force in the member axial direction acts on the reinforcing member, it has a stress transmission portion where stress transmission through the filler is performed between the pair of reinforcing members. The stress transmission portion includes a configuration for equalizing the adhesive stress generated between the reinforcing member and the filler along with the displacement generated between the reinforcing member and the filler when the tensile force acts, in the member axial direction. The stress transmission portion is configured such that a pair of the reinforcing members are overlapped and arranged so that the member axial directions are parallel, and the filler is filled between the reinforcing members. The joint structure is characterized by this.

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