Joint structure and repair method therefor

Abstract

To provide a joint structure that can be easily constructed on site and a repair method for a joint structure.SOLUTION: A joint structure 1 is a joint structure in which an end 31a of a second joint member 3 formed from an H-shaped steel extending in a direction intersecting with a joint surface 21 of a first joint member 2 formed from a steel material is joined to the joint surface 21, and comprises a scallop 34 formed so as to penetrate a web 32 at an end 32a of the web 32 of the second joint member 3 and at a position on a flange 31 side; and a penetration portion 4 formed so as to penetrate the web 32 at a position near the scallop 34 and on the opposite side of the joint surface 21 across the scallop 34. The penetration portion 4 consists of a plurality of penetration holes 40 arranged in line in an intersecting direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a joint structure and a method for repairing a joint structure. [Background technology]

[0002] In the past, in beam-column joints where steel columns and beams are welded together, it has been known to provide scallops in the web of the beam in order to weld the beam flange to the column. It has been confirmed that local stress concentration (strain concentration) in the flange at the base of the scallop induces cracks, making the flange at the end of the beam more susceptible to fracture. In response to this problem, methods such as the improved scallop method, non-scallop method, and inverted scallop method have been developed for newly constructed buildings to alleviate stress concentration at the base of the scallop.

[0003] The following Patent Document 1 discloses a construction method for drilling additional holes near scallops in repair work and the like. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2023-144538 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the holes described in Patent Document 1 have a radius of about 15 mm and must be drilled using large-scale equipment such as a medium- or large-sized atler, which makes on-site construction difficult.

[0006] Therefore, the present invention has been made in consideration of the above circumstances, and provides a joint structure and a method for repairing a joint structure that can be easily constructed on site. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention employs the following means. In other words, the joining structure of the present invention is a joining structure in which the end of a second joining member formed of H-shaped steel extending in a direction intersecting the joining surface is joined to the joining surface of a first joining member formed of steel, and is provided with a scallop formed to penetrate the web at the end of the web of the second joining member and on the flange side, and a through portion formed to penetrate the web near the scallop and on the opposite side of the scallop from the joining surface, and the through portion is a plurality of through holes arranged in a row in the intersecting direction.

[0008] In this joint structure, the strain concentration acting on the flange near the bottom of the scallop can be alleviated by the penetrations formed through the web near the scallop and on the opposite side of the scallop from the joint surface. The penetrations are multiple through holes arranged in a row in an intersecting direction, and forming multiple penetrations allows the size of each through hole to be reduced, making it easy to install on site using small tools such as an electric drill or a small atlas.

[0009] In the joint structure according to the present invention, the through hole may have a diameter of 22 mm or less.

[0010] In the joining structure according to the present invention, the distance between the centers of the plurality of through holes may be approximately the same as the thickness of the web.

[0011] In addition, in the joining structure according to the present invention, the distance between the center of the through hole closest to the scallop among the plurality of through holes and the scallop may be approximately the same as the thickness of the web.

[0012] In the joining structure according to the present invention, the distance from the center of the through hole to the flange may be approximately the same as the thickness of the web.

[0013] Furthermore, the joining structure according to the present invention is a joining structure in which an end of a second joining member formed of an H-shaped steel beam extending in a direction intersecting the joining surface is joined to the joining surface of a first joining member formed of steel, and the joining structure comprises a scallop formed at the end of the web of the second joining member and on the flange side so as to penetrate the web, and a through-hole formed at a position near the scallop and on the opposite side of the scallop from the joining surface, the through-hole being a long through hole in the intersecting direction.

[0014] In a joint structure configured in this way, a penetration formed through the web near the scallop and on the opposite side of the scallop from the joint surface can relieve the concentration of strain acting on the flange near the bottom of the scallop. The penetration is a long through hole in the intersecting direction, and can be formed by forming and connecting small holes in a row in the intersecting direction, or by cutting or other processing, making it easy to install on site.

[0015] In the joining structure according to the present invention, the length of the through hole in the intersecting direction may be approximately equal to twice the thickness of the web.

[0016] In the joining structure according to the present invention, the distance between the through hole and the scallop may be approximately the same as the thickness of the web.

[0017] In the joining structure according to the present invention, the distance from the center of the through hole to the flange may be approximately the same as the thickness of the web.

[0018] Furthermore, the method for repairing a joint structure according to the present invention is a method for repairing a joint structure in which an end of a second joint member formed of H-shaped steel extending in a direction intersecting the joint surface is joined to the joint surface of a first joint member formed of steel, and a scallop is formed at the end of the web of the second joint member on the flange side so as to penetrate the web, and a penetration portion is formed so as to penetrate the web near the scallop and on the opposite side of the scallop from the joint surface, and the penetration portion is a plurality of through holes arranged in a row in the intersecting direction.

[0019] In this method for repairing a joint structure configured in this way, a penetration formed through the web near the scallop and on the opposite side of the scallop from the joint surface can relieve the concentration of strain acting on the flange near the bottom of the scallop. The penetrations are multiple through holes arranged in a row in an intersecting direction, and forming multiple penetrations allows the size of each through hole to be reduced, making it easy to perform on-site repairs using small tools such as an electric drill or a small atlas.

[0020] Furthermore, the method for repairing a joint structure according to the present invention is a method for repairing a joint structure in which an end of a second joint member formed of an H-shaped steel extending in a direction intersecting the joint surface is joined to the joint surface of a first joint member formed of steel, and a scallop is formed at the end of the web of the second joint member on the flange side so as to penetrate the web, and a penetration portion is formed so as to penetrate the web near the scallop and on the opposite side of the scallop from the joint surface, and the penetration portion is a through hole that is long in the intersecting direction.

[0021] In this method for repairing a joint structure configured in this way, a penetration formed through the web near the scallop and on the opposite side of the scallop from the joint surface can alleviate the concentration of strain acting on the flange near the bottom of the scallop. The penetration is a long through hole in the intersecting direction, and can be formed by forming and connecting small holes in a row in the intersecting direction, or by cutting or other processing, making it easy to perform on-site construction. [Effects of the Invention]

[0022] The joint structure and the method for repairing the joint structure according to the present invention can be easily carried out on site. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a diagram showing a joint structure according to a first embodiment of the present invention. [Figure 2] FIG. 4 is a diagram showing a joint structure according to a second embodiment of the present invention. [Figure 3] The results of FEM analysis using a solid model are shown, where (a) is the analysis result of a model with only scallops, (b) is the analysis result of the joint structure according to the first embodiment, and (c) is the analysis result of the joint structure according to the second embodiment. [Figure 4] 10 is a graph comparing the equivalent strain of the flange near the scallop in the case of only the scallop, the joint structure according to the first embodiment, and the joint structure according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0024] (First embodiment) A joining structure according to a first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a joint structure according to a first embodiment of the present invention. 1, the joint structure according to this embodiment is, for example, a beam-column joint. As shown in FIG. 1, the joint structure 1 joins a first joint member 2 and a second joint member 3 together.

[0025] The first connecting member 2 is made of steel. The first connecting member 2 is, for example, a steel column or a diaphragm fixed to the steel column. The first connecting member 2 has a flat connecting surface 21. The connecting surface 21 is the surface facing the second connecting member 3 to be joined. If the first connecting member 2 is a column, for example, the side surface of the column corresponds to the connecting surface 21. If the first connecting member 2 is a diaphragm, for example, the end face of the diaphragm corresponds to the connecting surface 21.

[0026] The second joint member 3 is formed of an H-shaped steel. The second joint member 3 is, for example, a beam. The second joint member 3 has a lower flange 31, a web 32, and an upper flange (not shown).

[0027] The longitudinal direction of the second joining member 3 (the direction intersecting the joining surface) is referred to as the material axis direction X. The direction perpendicular to the material axis direction X and the direction in which the plate surface of the web 32 faces is referred to as the depth direction Y. The direction perpendicular to the material axis direction X and the depth direction Y is referred to as the up-down direction Z.

[0028] The lower flange 31 is formed in a plate shape. The plate surface of the lower flange 31 faces the up-down direction Z. The web 32 is formed in a plate shape. The plate surface of the web 32 faces the depth direction Y. The web 32 is connected to the upper surface 31b of the lower flange 31.

[0029] An end 31a of the lower flange 31 in the material axis direction X is joined to the joining surface 21 of the first joining member 2 by welding.

[0030] An upper flange (not shown) is connected to the top of the web 32. The upper flange is also joined to the joining surface 21 by welding, similar to the lower flange 31. An end 32a of the web 32 in the material axis direction X is also joined to the joining surface 21 by welding. Note that the end 31a of the lower flange 31 and the joining surface 21 to which the end 32a of the web 32 is joined do not have to be made of the same member. For example, the end 31a of the lower flange 31 may be joined to a diaphragm, and the end 32a of the web 32 may be joined to a column.

[0031] The joint structure 1 includes a scallop 34 and a penetration portion 4.

[0032] The scallop 34 is formed at the end 32a of the web 32 at a position on the lower flange 31 and on the lower flange 31 side. The scallop 34 is formed adjacent to the lower flange 31. The scallop 34 is formed so as to penetrate the web 32 in the depth direction Y. The scallop 34 is formed so as to cut out the end 32a and the lower end 32b of the web 32. In the illustrated example, the scallop 34 is formed in a substantially quarter-circle shape. The shape of the scallop 34 can be set as appropriate.

[0033] The through portions 4 are a plurality of through holes 40 arranged side by side in the material axis direction X. In the illustrated example, three through holes 40 are formed. The number of through holes 40 can be set as appropriate as long as it is two or more. The through holes 40 are circular. The through holes 40 do not have to be circular, and may be elliptical or oblong. The through holes 40 are formed above the upper surface 31b of the lower flange 31, near the scallops 34, and on the opposite side of the scallops 34 from the joining surface 21. The diameter of the through holes 40 is 22 mm or less, more preferably 10 mm or less, and preferably approximately 9 mm, for example. Because the diameter of the through holes 40 is 22 mm or less, they can be drilled using a small tool such as an electric drill or a small drill bit.

[0034] A distance A1 from the center of a through hole 40 to the upper surface 31b of the lower flange 31 is approximately the same as the thickness (length in the depth direction Y) of the web 32. A spacing A2 between the centers of the multiple through holes 40 is approximately the same as the thickness of the web 32. A distance A3 between the center of the scallop 34 and the center of the through hole 40 that is closest to the scallop 34 among the multiple through holes 40 is approximately the same as the thickness of the web 32.

[0035] Next, a method for repairing the joint structure will be described. In the joint structure between the existing first joint member 2 and second joint member 3, the scallops 34 are already formed. A plurality of through holes 40 are formed in the material axis direction X near the scallops 34 and on the opposite side of the scallops 34 from the joint surface 21. The through holes 40 can be drilled with a small tool such as an electric drill or a small atlas. This method is also applicable to the joint structure 1 between the newly installed first joint member 2 and second joint member 3. The scallops 34 and the through holes 4 may be formed in the second joint member 3 on-site, or the scallops 34 and the through holes 4 may be formed in the second joint member 3 in advance at a factory, etc.

[0036] In the joint structure 1 and the method for repairing a joint structure configured in this manner, the concentration of strain acting on the lower flange 31 near the bottom of the scallop 34 can be alleviated by the multiple through holes 40 formed through the web 32 near the scallop 34 and on the opposite side of the scallop 34 from the joint surface 21. By arranging multiple through holes 40 side by side in the material axis direction X, the size of each through hole 40 can be reduced, allowing for easy construction on site using small tools such as an electric drill or a small atlas.

[0037] (Second embodiment) Next, a joining structure according to a second embodiment of the present invention will be described mainly with reference to Fig. 2. In the following description of the embodiment, the same or similar members and parts as those in the above-described embodiment will be designated by the same reference numerals, and their description will be omitted, and only configurations different from the embodiment will be described.

[0038] FIG. 2 is a diagram showing a joint structure according to a second embodiment of the present invention. As shown in Fig. 2, the through portion 4A is a through hole 40A that is elongated in the material axis direction X. The through hole 40A is formed above the upper surface 31b of the lower flange 31, near the scallop 34, and on the opposite side of the scallop 34 from the joining surface 21. The through hole 40A can be formed by forming and connecting small holes in succession in the material axis direction X, or by cutting or the like to form an elongated hole.

[0039] A distance B1 from the center of the through hole 40A to the upper surface 31b of the lower flange 31 is approximately the same as the thickness of the web 32. A length B2 of the through hole 40A in the material axis direction X is approximately the same as twice the thickness of the web 32. A distance B3 between the through hole 40A and the scallop 34 is approximately the same as the thickness of the web 32.

[0040] In the joint structure 1A and the method for repairing a joint structure configured in this manner, the through hole 40A formed to penetrate the web 32 near the scallop 34 and on the opposite side of the scallop 34 from the joint surface 21 can alleviate the concentration of strain acting on the lower flange 31 near the bottom of the scallop 34. The through hole 40A is an elongated hole that is long in the material axis direction X, and can be formed into an elongated hole by forming and connecting small holes in a series in an intersecting direction, or by cutting or the like, and therefore can be easily constructed on site.

[0041] Next, we performed FEM analysis using a solid model on the connection structure 1 of the first embodiment and the connection structure 1A of the second embodiment to verify their effectiveness. The analysis results are shown in Figure 3. Figure 3(a) shows the analysis results for a model without modifications (only the scallops 34), Figure 3(b) shows the analysis results for the connection structure 1 of the first embodiment, and Figure 3(c) shows the analysis results for the connection structure 1A of the second embodiment. The analysis focused primarily on strain at the bottom of the scallops, which can cause beam fracture. In the case without modifications shown in Figure 3(a), strain is concentrated on the flange (lower flange 31) near the bottom of the scallops 34. In the connection structure 1 shown in Figure 3(b) and the connection structure 1A shown in Figure 3(c), strain concentration on the lower flange 31 near the bottom of the scallops 34 is alleviated compared to the case without modifications.

[0042] Fig. 4 shows a comparison of the equivalent strain of the lower flange 31 near the scallop 34, where there is concern about strain concentration. As shown in Fig. 4, it can be seen that in the joint structure 1 of the first embodiment and the joint structure 1A of the second embodiment, a reduction in strain in the lower flange 31 at the bottom of the scallop 34 can be expected.

[0043] The shapes and combinations of the components shown in the above-described embodiment are merely examples, and various modifications can be made based on design requirements, etc., within the scope of the present invention. [Explanation of symbols]

[0044] 1,1A joint structure 2. First joining member 3 Second joining member 4,4A penetration 21 Joint surface 32 Web 34 Scallop 40,40A through hole

Claims

1. A joining structure in which an end of a second joining member formed of an H-shaped steel extending in a direction intersecting the joining surface is joined to a joining surface of a first joining member formed of a steel material, a scallop formed at an end of the web of the second joining member and on a flange side thereof so as to penetrate the web; a through-hole formed in the vicinity of the scallop and on the opposite side of the scallop from the joining surface so as to penetrate the web, A joining structure in which the through portion is a plurality of through holes arranged side by side in the intersecting direction.

2. The joining structure according to claim 1 , wherein the through hole has a diameter of 22 mm or less.

3. The joining structure according to claim 1 or 2, wherein the distance between the centers of the plurality of through holes is approximately the same as the thickness of the web.

4. The joining structure according to claim 1 or 2, wherein the distance between the center of the through hole closest to the scallop and the scallop is substantially the same as the thickness of the web.

5. The joining structure according to claim 1 or 2, wherein the distance from the center of the through hole to the flange is substantially the same as the thickness of the web.

6. A joining structure in which an end of a second joining member formed of an H-shaped steel extending in a direction intersecting the joining surface is joined to a joining surface of a first joining member formed of a steel material, a scallop formed at an end of the web of the second joining member and on a flange side thereof so as to penetrate the web; a through-hole formed in the vicinity of the scallop and on the opposite side of the scallop from the joining surface so as to penetrate the web, The through-hole is a through-hole that is long in the intersecting direction.

7. The joining structure according to claim 6 , wherein the length of the through hole in the intersecting direction is approximately equal to twice the thickness of the web.

8. The joining structure according to claim 6 or 7, wherein the distance between the through hole and the scallop is approximately the same as the thickness of the web.

9. The joining structure according to claim 6 or 7, wherein the distance from the center of the through hole to the flange is substantially the same as the thickness of the web.

10. A repair method for a joint structure in which an end of a second joint member formed of an H-shaped steel extending in a direction intersecting the joint surface is joined to a joint surface of a first joint member formed of a steel material, and a scallop is formed at an end of a web of the second joint member and on a flange side thereof so as to penetrate the web, a through-hole is formed in the vicinity of the scallop and on the opposite side of the scallop from the joining surface so as to penetrate the web; A method for repairing a joint structure, wherein the penetration portion is a plurality of through holes arranged in a row in the intersecting direction.

11. A repair method for a joint structure in which an end of a second joint member formed of an H-shaped steel extending in a direction intersecting the joint surface is joined to a joint surface of a first joint member formed of a steel material, and a scallop is formed at an end of a web of the second joint member and on a flange side thereof so as to penetrate the web, a through-hole is formed in the vicinity of the scallop and on the opposite side of the scallop from the joining surface so as to penetrate the web; A method for repairing a joint structure, wherein the penetration portion is a long through hole in the intersecting direction.

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