JP7660853B2 - Beam through hole reinforcement structure - Google Patents

Description

The present invention relates to a technique for reinforcing beam through holes in steel frame structures.

Conventionally, a reinforcement structure in which reinforcing material is welded around the through hole has been known as a reinforcement structure for through holes formed in beams of steel frame structures. However, this reinforcement structure can cause problems such as deformation of the beam or localized material changes due to welding, as well as problems such as difficulty in ensuring welding quality during construction or difficulty in welding itself during erection.

For this reason, conventionally, a reinforcement structure has been adopted in which reinforcing material is attached around the through-hole with high-strength bolts rather than welding. Examples of such reinforcement structures include those described in Patent Documents 1 and 2. Patent Document 1 discloses a reinforcement structure in which an opening reinforcement plate is joined around the through-hole with high-strength bolts on both sides of the beam web. Patent Document 2 discloses a structure in which the through-hole of the beam joint is reinforced with a splice plate.

Japanese Utility Model Application Publication No. 5-057149 Japanese Patent Application Publication No. 5-179756

In the reinforcement structure described in Patent Document 1, many bolts are required to fasten the opening reinforcement plate to the beam web, making construction cumbersome. On the other hand, the reinforcement structure described in Patent Document 2 is configured with splice plates above and below the through hole, and is considered to be easier to construct than the reinforcement structure described in Patent Document 1. However, since the structure is such that the through hole is not reinforced except at its upper and lower ends, that is, the structure has an unreinforced portion around the through hole, there is room for improvement in terms of reinforcing the through hole against shear forces.

The present invention was made in consideration of the above circumstances, and aims to more reliably reinforce the through-hole and improve workability in a beam through-hole reinforcement structure that has a non-reinforced portion around the through-hole.

One aspect of the present invention that solves the above-mentioned problems is a reinforcement structure for a through hole provided in a steel beam having a web and a flange, comprising a reinforcing material including a hole perimeter reinforcement portion having an arc-shaped edge shaped along part of the perimeter of the through hole and a fastening portion that is a fastening point with the web, and an unreinforced portion provided along the remainder of the perimeter of the through hole, wherein the hole perimeter reinforcement portion is between the unreinforced portion and the flange, and at least one fastening portion is provided in each of the following first regions provided in the hole perimeter reinforcement portion, and at least one fastening portion is provided in each of the following second regions.
・X-axis direction: longitudinal direction of the steel beam ・Y-axis direction: direction perpendicular to the X-axis direction when viewed from a direction perpendicular to the web surface ・α _x- line: straight line extending in the X-axis direction passing through the end point of the arc edge ・Circular edge intersection: intersection point between the α _x- line and the through hole ・α _{y -} line: straight line extending in the Y-axis direction passing through the circular edge intersection ・α _x '-line: tangent line of the through hole extending in the X-axis direction ・α y '-line: tangent line of the through hole extending in the Y _- axis direction ・First region: region outside the α _x- line and outside the α _y -line in the hole perimeter reinforcement part ・Second region: region where the region outside the α _x '-line and outside the α y '-line in the hole perimeter reinforcement part overlaps with the first region

The reinforcing material may include an upper reinforcing material that reinforces the upper portion of the through hole, and a lower reinforcing material that reinforces the lower portion of the through hole.

The thickness of the central portion of the hole periphery reinforcement portion in the X-axis direction may be thicker than the thickness of the end portions.

The non-reinforced portion may be provided at only one location around the through hole.

The angle between a straight line extending in the Y-axis direction passing through the center of the through hole and a straight line connecting the center of the through hole and the circular edge intersection point may be approximately 45°.

According to the present invention, in a beam through-hole reinforcement structure having a non-reinforced portion around the through-hole, the through-hole can be reinforced more reliably and workability can be improved.

1 is a front view and a right side view showing the schematic configuration of a beam through hole reinforcement structure according to a first embodiment. FIG. FIG. 2 is a single-item view of the reinforcing material according to the first embodiment. A diagram showing the fastening region (second region) between the steel beam and the reinforcing material in the first embodiment. FIG. 13 is a diagram for explaining the definition of a fastening region (second region). 11 is a diagram showing a deformation state of a through hole when a shear force is applied. FIG. 13A and 13B are a front view and a right side view showing the schematic configuration of a beam through hole reinforcement structure according to a second embodiment. 11 is a single-item view (front view and bottom view) of a reinforcing material according to a second embodiment. FIG. 11A and 11B are diagrams illustrating an example of a configuration of a reinforcing material according to a second embodiment. 13A to 13C are a left side view, a front view, and a right side view showing the schematic configuration of a beam through hole reinforcement structure relating to a third embodiment. FIG. 13 is a single-item view of a reinforcing material according to a third embodiment. A diagram showing the fastening region (second region) between the steel beam and the reinforcing material in the third embodiment. FIG. 13 is a diagram for explaining the definition of a fastening region (second region) according to the third embodiment. 11A to 11C are diagrams showing examples of attaching reinforcing materials to both sides of a web. 11A to 11C are diagrams showing examples of attaching reinforcing materials to both sides of a web.

Embodiments of the present invention will be described below with reference to the drawings. Note that in this specification and the drawings, elements having substantially the same functional configuration are designated by the same reference numerals to avoid redundant description.

First Embodiment
Fig. 1 is a front view and a right side view showing a schematic configuration of a beam through hole reinforcement structure according to a first embodiment. Fig. 2 is a single-item view of a reinforcement material according to the first embodiment.

As shown in FIG. 1, the beam through hole reinforcement structure 1 (hereinafter referred to as the "reinforcement structure") comprises a steel beam 10 and two reinforcements 20a and 20b.

The steel beam 10 is a beam having a web 11 and flanges 12 and 13, and is made of steel such as H-shaped steel or I-shaped steel. In addition, a circular through hole 14 is formed in the center of the web 11 between the flanges 12 and 13.

The two reinforcing members 20a and 20b are roughly rectangular plate members that reinforce the periphery of the through hole 14 and are arranged above and below the through hole 14. More specifically, the upper reinforcing member 20a is arranged between the through hole 14 and the upper flange 12, and the lower reinforcing member 20b is arranged between the through hole 14 and the lower flange 13.

As shown in FIG. 2, the lower reinforcement 20b has a hole-periphery reinforcement portion 21 that reinforces the area around the through-hole 14, an arc edge 22 formed on the hole-periphery reinforcement portion 21, and a fastening portion 23 that is the fastening point with the steel beam 10.

The hole perimeter reinforcement portion 21 has a surface that contacts the web surface surrounding the through hole 14.

The arc side 22 is a curved portion that is curved so as to be convex toward the inside of the hole perimeter reinforcement portion 21, and is formed in the center of one of the two long sides of the hole perimeter reinforcement portion 21. The radius of curvature of the arc side 22 is approximately the same as the radius of curvature of the through hole 14, and is shaped to follow the periphery (hole circumference) of the through hole 14. The arc length of the arc side 22 is shorter than 1/2 the length of the circumference of the through hole 14.

The fastening portion 23 is an insertion hole through which a fastener such as a bolt is inserted. The fastening portion 23 is provided in two places on the hole perimeter reinforcement portion 21 of the lower reinforcement member 20b.

The upper reinforcement 20a is a part with the same shape as the lower reinforcement 20b, and like the lower reinforcement 20b, has an arc edge 22 and a fastening portion 23 in the hole perimeter reinforcement portion 21.

The reinforcing members 20a, 20b do not have to have the same shape, but it is preferable that they have the same shape in order to uniformly generate deformation resistance to shear force at the upper and lower parts of the through hole 14. For the same reason, it is preferable that each of the reinforcing members 20a, 20b has a symmetrical shape.

The upper reinforcement 20a and the lower reinforcement 20b are arranged upside down around the through hole 14. In more detail, the upper reinforcement 20a is arranged above the through hole 14 so that a portion of the periphery of the through hole 14 overlaps with the position of the arc side 22 of the upper reinforcement 20a, and the lower reinforcement 20b is arranged below the through hole 14 so that a portion of the periphery of the through hole 14 overlaps with the position of the arc side 22 of the lower reinforcement 20b.

As shown in FIG. 1(b), the upper reinforcement member 20a and the lower reinforcement member 20b are attached to both sides 11a and 11b of the web 11. In more detail, a pair of upper reinforcement member 20a and lower reinforcement member 20b is attached to one web surface 11a, and another pair of upper reinforcement member 20a and lower reinforcement member 20b is attached to the other web surface 11b.

As described above, the arc length of each of the arc sides 22 of the upper reinforcement 20a and the lower reinforcement 20b is shorter than half the circumference of the through hole 14, so when each reinforcement 20a, 20b is fixed to the web 11, a gap is formed between the hole periphery reinforcement portion 21 of each reinforcement 20a, 20b.

In the above gap, the through hole 14 is not reinforced by the periphery reinforcement portion 21, so this gap portion becomes the unreinforced portion 30. The unreinforced portion 30 exists on either side of the through hole 14, and the periphery reinforcement portion 21 exists between the unreinforced portion 30 and each of the flanges 12 and 13.

That is, in the reinforcement structure 1, a part of the periphery of the through hole 14 is reinforced by the hole periphery reinforcement part 21, and the remaining part of the periphery of the through hole 14 is not reinforced due to the presence of the non-reinforced part 30. In order to increase the deformation resistance against shear force in such a reinforcement structure 1, it is necessary to have a specific fastening area described later and to position the fastening part 23 within this specific fastening area. Note that a state in which the fastening part 23 is provided within a specific fastening area means a state in which the center of the insertion hole as the fastening part 23 is located within the specific fastening area (including the case in which the center of the insertion hole is located on the boundary line of the area). Therefore, a state in which the center of the insertion hole is located outside the specific fastening area means a state in which the fastening part 23 is not provided within the specific fastening area, even if a part of the area of the insertion hole is included within the specific fastening area.

3 is a diagram showing the fastening regions _R2 between the steel beam 10 and the reinforcing members 20a and 20b. As shown in this figure, the reinforcing structure 1 has four fastening regions _R2 , and a fastening portion 23 is located in each of the fastening regions _R2 .

The definition of the fastening region _R2 will be described below with reference to FIG.

In the following description, the "X-axis direction" refers to the longitudinal direction of the steel beam 10, in other words, the direction parallel to the flanges 12, 13 when viewed from a direction perpendicular to the web surface 11a. The "Y-axis direction" refers to the direction perpendicular to the X-axis direction when viewed from a direction perpendicular to the web surface 11a, in other words, the direction perpendicular to the flanges 12, 13. In the following description, the straight line passing through the center of the through hole 14 and extending in the X-axis direction is referred to as center line _Cx , and the straight line passing through the center of the through hole 14 and extending in the Y-axis direction is referred to as center line _Cy .

First, as shown in Fig. 4(a), a straight line extending in the X-axis direction passing through the end point 24 (also shown in Fig. 2) of the arc side 22 is defined as an "α _x- line." In this embodiment, the straight line passing through the end point 24 of the arc side 22 of the upper reinforcement member 20a and the straight line passing through the end point 24 of the arc side 22 of the lower reinforcement member 20b are the α _x- line.

Depending on the shape of the arcuate sides 22 of each of the reinforcing members 20a, 20b, for example when the arcuate sides 22 are not symmetrical, there may be two straight lines passing through the end points 24 of the arcuate sides 22 for each reinforcing member, resulting in a total of four α _x lines. However, in such a case, the straight line extending in the X-axis direction passing through the end point 24 closest to the flange (in other words, the end point farthest from the center line C _x ) among the multiple end points 24 of one reinforcing member is defined as the α _x line.

Next, the intersection P between the α _x- ray and the through hole 14 is defined as a "circular edge intersection." In this embodiment, the upper reinforcement member 20a and the lower reinforcement member 20b each have a bilaterally symmetrical shape, and the arc-shaped sides 22 of each reinforcement member 20a, 20b are located along the periphery of the through hole 14, so that the positions of the end points 24 of the two arc-shaped sides 22 are directly the positions of the circular edge intersection P.

Next, as shown in Fig. 4B, a straight line extending in the Y-axis direction passing through the circular edge intersection points P is defined as an " _αy line." In this embodiment, since the four circular edge intersection points P are located at positions symmetrical in the vertical and horizontal directions, the straight line passing through the vertically aligned circular edge intersection points P on the left side of the center line _Cy of the through hole 14 and the straight line passing through _the vertically aligned circular edge intersection points P on the right side of the center line Cy of the through hole 14 are the _αy lines.

For example, depending on the shape of the arc side 22 of each reinforcing member 20a, 20b, the positions of the circular edge intersections P in the X-axis direction may differ from one another, resulting in the existence of four _αy lines. However, in such a case, the straight line extending in the Y-axis direction passing through the circular edge intersection P that is the furthest from the center line C _y among the circular edge intersections P that exist on the left side of the center line _C y of the through hole 14 is defined as the first _αy line. Then, the straight line extending in the Y-axis direction passing through the circular edge intersection P that is the furthest from the center line C _y among the circular edge intersections P that exist on the right side of the center line C _y of the through hole 14 is defined as the second _αy line.

Next, the region _R1 outside the α _x line (opposite the center side of the through hole 14) and outside the α _y line (opposite the center side of the through hole 14) in the hole circumferential reinforcement portion 21 is defined as the "first region."

Next, as shown in FIG. 4(c), a tangent to through hole 14 extending in the X-axis direction is defined as "line α _x '", and a tangent to through hole 14 extending in the Y-axis direction is defined as "line α _y '".

Finally, the region R2 where the region outside the α _x ' line (opposite the center side of the through hole 14) and the α _y ' line (opposite the center side of the through hole 14) in the hole periphery reinforcement part ₂₁ overlaps with the first region _R1 is defined as the "second region." This second region _R2 is the fastening region _R2 between the steel beam 10 and each of the reinforcements 20a, 20b described above.

In this embodiment, the above-mentioned first region _R1 and a fastening region R2 located within the first region _R1 are present at each of the four corners of a rectangle formed by each of the reinforcing members 20a, 20b and the pair of unreinforced portions ₃₀ , and a fastening portion 23 is located within each fastening region _R2 . The upper reinforcing member 20a and the lower reinforcing member 20b are fastened to the web surface 11a at each fastening portion 23 with a bolt or the like.

As described above, in the reinforcement structure 1 according to this embodiment, the hole periphery reinforcement part 21 having the arc side 22 and the non-reinforced part 30 are provided, and the fastening parts 23 are located in each of the fastening parts _R2 (second regions) provided in each of the first regions _R1 . According to tests carried out by the inventors of the present application, it has been confirmed that in such a reinforcement structure 1, by fastening the steel beam 10 and the reinforcing members 20a, 20b with bolts or the like at each fastening part 23, sufficient reinforcement performance can be exhibited even if fastening is not performed outside the fastening region _R2 .

That is, even though the reinforcement structure 1 has the unreinforced portion 30, it has better reinforcement performance for the through hole than the conventional structure such as that of Patent Document 2. Furthermore, compared to the conventional structure in which a large number of bolts are fastened at equal intervals along each side of the reinforcement plate, the reinforcement structure 1 can reduce the number of fastening points, reducing the load of the fastening work and improving workability. In addition, the reinforcement structure 1 has the effect of reducing the amount of material used due to the presence of the unreinforced portion 30, and reducing the number of bolts, thereby reducing construction costs and making the steel structure lighter.

In this embodiment, one fastening portion 23 is provided per fastening region _R2 , but from the viewpoint of enhancing the reinforcing performance, two or more fastening portions 23 may be provided per fastening region _R2 . In other words, at least one fastening portion 23 may be provided in each of the multiple fastening regions _R2 (second regions). Also, a fastening portion 23 may be provided in the second region _R2 , and another fastening portion (not shown) may be provided outside the second region _R2 and within the first region _R1 . That is, at least one fastening portion 23 may be provided in each region of the first region _R1 , and at least one fastening portion 23 may be provided in each region of the second region _R2 . Since the second region _R2 is a region that exists in the first region _R1 , for example, when one fastening portion 23 is provided in the second region _R2 , the fastening portion 23 is counted as one of the fastening portions provided in the second region _R2 , but is also counted as one of the fastening portions provided in the first region _R1 . In other words, when one fastening portion 23 is provided in the second region _R2 , it can be said that one fastening portion 23 is also provided in the first region _R1 .

Furthermore, according to tests carried out by the inventors of the present application, it has been confirmed that when a shear force as shown by the black arrow in Fig. 5 acts on the through hole 14, the through hole 14 deforms in a direction of approximately 45°. Therefore, in order to effectively reinforce the through hole 14, it is preferable that the angle θ between the center line C _y of the through hole 14 shown in Fig. 3 and the straight line connecting the center of the through hole 14 and the circular edge intersection point P is approximately 45° (40 to 50°).

Second Embodiment
Fig. 6 is a front view and a right side view showing a schematic configuration of the beam through hole reinforcement structure 1 according to the second embodiment. Fig. 7 is a single-item view (front view and bottom view) of the reinforcement material 20b according to the second embodiment.

In the second embodiment, only the shape of the hole perimeter reinforcement part 21 differs from the first embodiment. The reinforcement structure 1 according to the second embodiment is useful when the distance between the hole perimeter reinforcement part 21 and the flanges 12, 13 of the steel beam 10 is short. The shape of the hole perimeter reinforcement part 21 according to the second embodiment will be described below, but descriptions that are similar to those of the first embodiment may be omitted.

As shown in FIG. 6, in this embodiment, the upper reinforcement member 20a and the lower reinforcement member 20b are arranged upside down at the top and bottom of the through hole 14, and have the same shape as individual components.

As shown in FIG. 7, the hole perimeter reinforcement portion 21 according to this embodiment has a flat plate shape around the fastening portion 23, but in the area where the arc side 22 is formed, the plate thickness of the hole perimeter reinforcement portion 21 gradually increases toward the center of the hole perimeter reinforcement portion 21 in the X-axis direction. In other words, in a cross section of the hole perimeter reinforcement portion 21 perpendicular to the Y-axis direction, there is a mountain-shaped portion toward the center of the hole perimeter reinforcement portion 21.

As illustrated in this embodiment, when the plate thickness of the central portion of the hole perimeter reinforcement portion 21 in the X-axis direction is thicker than the plate thickness of the end portion, the rigidity of the hole perimeter reinforcement portion 21 against shear force is increased, and the reinforcement performance is improved. Therefore, even if the width W in the Y-axis direction of the hole perimeter reinforcement portion 21 shown in FIG. 7(a) is made shorter than that of the flat plate-shaped hole perimeter reinforcement portion 21 illustrated in the first embodiment, it is possible to obtain reinforcement performance equivalent to that of the flat plate-shaped hole perimeter reinforcement portion 21.

In the above explanation, an example was described in which the plate thickness of the periphery hole reinforcement portion 21 gradually increases toward the center of the periphery hole reinforcement portion 21 in the X-axis direction in the area where the arc side 22 is formed, but as illustrated in Figures 8(a) to (c), a separate plate material 25 may be joined to the periphery hole reinforcement portion 21 so as to overlap it. Even in such a case, the plate thickness of the center of the periphery hole reinforcement portion 21 in the X-axis direction is thicker than the plate thickness of the end portions, so that the reinforcing performance described above can be obtained.

The reinforcement structure 1 according to this embodiment can reduce the size of the reinforcement members 20a and 20b while ensuring the reinforcing performance of the through hole 14. This allows the reinforcement structure 1 to be applied to a steel beam 10 with a narrow gap between the flanges 12 and 13, for example.

Third Embodiment
Fig. 9 is a left side view, a front view, and a right side view showing a schematic configuration of a beam through hole reinforcement structure 1 according to the third embodiment. Fig. 10 is a single view of a reinforcement material 20 according to the third embodiment.

The third embodiment differs from the first embodiment in that a single reinforcement member 20 is used instead of the upper reinforcement member 20a and the lower reinforcement member 20b, and that only one unreinforced portion 30 is provided. The third embodiment will be described below, but descriptions that are similar to those of the first embodiment may be omitted.

As shown in Figures 9 and 10, the reinforcing material 20 according to this embodiment is a flat plate with a rectangular outer shape, and has a generally U-shaped shape with a rectangular cutout on one side of the square connected to a circular opening formed in the center of the plate. In this reinforcing material 20, the portion excluding the circular opening in the center and the rectangular cutout is the hole perimeter reinforcement portion 21, and the cutout portion is the non-reinforced portion 30.

The hole perimeter reinforcement portion 21 has an arc edge 22 formed along the periphery of the through hole 14, and as shown in FIG. 10, the arc edge 22 has two end points 24.

As shown in Figure 11, in this embodiment, the reinforcement material 20 is positioned so that the periphery of the through hole 14 and the position of the arc edge 22 coincide with each other, and the steel beam 10 and the reinforcement material 20 are fastened with a bolt or the like at the fastening portion 23 located within the fastening region _R2 .

FIG. 12 is a diagram for explaining the definition of the fastening region R ₂ (second region) according to this embodiment. However, since the method of defining the fastening region R ₂ is similar to that of the first embodiment, the description thereof will be omitted.

However, in this embodiment, unlike the first embodiment, there is only one unreinforced portion 30, and therefore, as shown in Fig. 12(a), there is no end point 24 of the arc side 22 on the left side of the center line C _y of the through hole 14. However, since the intersection point of the straight line (line α _x ) extending in the X-axis direction passing through the end point 24 of the arc side 22 and the through hole 14 is the circular edge intersection point P, there are four circular edge intersection points P as in the first embodiment.

The reinforcement structure 1 according to this embodiment is configured as described above. With this reinforcement structure 1, the number of non-reinforced portions 30 is smaller than in the reinforcement structure 1 according to the first embodiment, and therefore the reinforcement performance of the through holes 14 is improved. Therefore, the reinforcement structure 1 according to this embodiment is useful when high reinforcement performance is required. Furthermore, with this reinforcement structure 1, the number of fastening points for bolts, etc. can be reduced compared to the conventional structure, so it is possible to obtain the effect of improving workability.

When attaching the reinforcement 20 to the steel beam 10, it is preferable that the unreinforced portion 30 is not only located in the longitudinal direction of the steel beam 10, but also that the position of the unreinforced portion 30 does not coincide with the web surface 11a and the web surface 11b. For example, by attaching each reinforcement 20 so that the unreinforced portion 30 of the reinforcement 20 attached to the web surface 11a is located on the right side (positive side in the X-axis direction) in FIG. 12 and the unreinforced portion 30 of the reinforcement 20 attached to the web surface 11b is located on the left side (negative side in the X-axis direction) in FIG. 12, the steel beam 10 as a whole will have no unreinforced portion 30 around the entire circumference of the through hole 14 (i.e., the periphery of the through hole 14 will be reinforced around the entire circumference), improving the reinforcement performance.

In the reinforcing structure 1 according to the first to third embodiments described above, the reinforcing material 20 disclosed in the present application is attached to both sides (front and back) of the web 11, but reinforcing materials 20 of different shapes may be attached to one web surface 11a and the other web surface 11b.

For example, as shown in FIG. 13, a pair of reinforcing members 20a, 20b described in the first embodiment may be attached to one web surface 11a, and a conventional reinforcing member 80 may be attached to the other web surface 11b. Even in this case, the effect described in the above embodiment can be obtained on the side of one web surface 11a.

For the same reason, as shown in FIG. 14, the reinforcing material 20 described in the third embodiment may be attached to one web surface 11a, and the conventional reinforcing material 80 may be attached to the other web surface 11b.

Although the embodiments of the present invention have been described above, 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 described in the claims, and it is understood that these also naturally fall within the technical scope of the present invention.

For example, the components of the above embodiments can be combined in any manner. Any such combination will naturally provide the actions and effects of each of the components in the combination, and will also provide other actions and effects that will be apparent to those skilled in the art from the description in this specification.

Furthermore, the effects described in this specification are merely descriptive or exemplary and are not limiting. In other words, the technology disclosed herein may achieve other effects that are apparent to a person skilled in the art from the description in this specification, in addition to or in place of the above effects.

The present invention can be applied to reinforcement of beam through holes in steel frame structures.

1 Beam through hole reinforcement structure 10 Steel beam 11 Web 11a Web surface 11b Web surface 12 Upper flange 13 Lower flange 14 Through hole 20 Reinforcement material 20a Upper reinforcement material 20b Lower reinforcement material 21 Hole circumference reinforcement portion 22 Arc edge 23 Fastening portion 24 End point of arc edge 25 Plate material 30 Non-reinforced portion P Circular edge intersection point R ₁ First region R ₂ Fastening region (second region)

Claims (5)

A reinforcement structure for a through hole provided in a steel beam having a web and a flange,
A reinforcing material including a hole periphery reinforcing portion having an arc side shaped along a part of the periphery of the through hole and a fastening portion which is a fastening portion to the web;
and an unreinforced portion provided along the remainder of the periphery of the through hole,
The hole periphery reinforcement portion is present between the non-reinforced portion and the flange,
A beam through hole reinforcement structure, characterized in that the fastening portion is provided in at least one of the following first regions provided in the hole surrounding reinforcement portion, and in at least one of the following second regions.
・X-axis direction: longitudinal direction of the steel beam ・Y-axis direction: direction perpendicular to the X-axis direction when viewed from a direction perpendicular to the web surface ・α _x- line: straight line extending in the X-axis direction passing through the end point of the arc edge ・Circular edge intersection: intersection point between the α _x- line and the through hole ・α _{y -} line: straight line extending in the Y-axis direction passing through the circular edge intersection ・α _x '-line: tangent line of the through hole extending in the X-axis direction ・α y '-line: tangent line of the through hole extending in the Y _- axis direction ・First region: region outside the α _x- line and outside the α _y -line in the hole perimeter reinforcement part ・Second region: region where the region outside the α _x '-line and outside the α y '-line in the hole perimeter reinforcement part overlaps with the first region As the reinforcing material, an upper reinforcing material that reinforces an upper portion of the through hole and a lower reinforcing material that reinforces a lower portion of the through hole are provided,
The beam through hole reinforcement structure according to claim 1 , wherein the non-reinforced portion is provided between the upper reinforcement member and the lower reinforcement member. The beam through hole reinforcement structure according to claim 2, characterized in that the plate thickness of the central portion of the hole perimeter reinforcement portion in the X-axis direction is thicker than the plate thickness of the end portions. The beam through hole reinforcement structure according to claim 1, characterized in that the non-reinforced portion is provided in only one location around the through hole. A beam through hole reinforcement structure described in any one of claims 1 to 4, characterized in that the angle between a straight line extending in the Y-axis direction passing through the center of the through hole and a straight line connecting the center of the through hole and the circular edge intersection is approximately 45°.

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