Welded h-shaped steel beam and manufacturing method thereof, and rolled h-shaped steel beam and manufacturing method thereof

Abstract

To provide an H-shaped steel beam having a scallop capable of improving production efficiency while improving the anti-deformation performance of the beam end by reducing stress and strain concentration at the base of the scallop.SOLUTION: A disclosed H-shaped steel beam 10 is a welded H-shaped steel beam that has a beam web 11 and a beam flange 12. The beam web 11 has a scallop 14 at the end connected to another structure and at the end connected to the beam flange 12. The beam flange 12 has a bevel 25 at one end that is joined to another structure. In the extension direction of the beam flange 12, out of the two ends of the welded portions 41a and 41b between the beam flange 12 and the beam web 11 in the extending direction of the beam web 11, defining the distance in the extension direction from the bevel shoulder 25a to the end 14d proximal to the end which is joined to another structure as Lb, the distance Lb satisfies the following equation (1):SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a welded H-shaped steel beam and a manufacturing method thereof, and a rolled H-shaped steel beam and a manufacturing method thereof. [Background technology]

[0002] In welding a column to a beam, a scalloping method is commonly used, in which an H-shaped steel beam with a scallop formed at the end of the beam web is welded to a column using a backing metal (see Patent Document 1). The scallop is a circular, semicircular, or other notch provided at the end of the beam web in order to, for example, turn-weld the beam web to the beam flange during the manufacturing process of the welded H-shaped steel beam. When such a welded H-shaped steel beam is welded to a column, it has been found that stress tends to concentrate at the intersection between the end face of the beam web facing the scallop and the inner surface of the beam flange (hereinafter referred to as the scallop bottom).

[0003] In recent years, instead of making the shape of the above-mentioned scallop a quarter-circular arc shape, for example, it has been considered to make it a composite arc shape combining two arcs of different radii, such as an arc with a radius of 35 mm and an arc with a radius of 10 mm, and to reduce the concentration of stress and strain by making the cross-sectional changes of the beam flange and beam web near the bottom of the scallop gentler (see non-patent document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7195081 [Non-patent literature]

[0005] [Non-Patent Document 1] Steel Construction Technical Guidelines - Factory Fabrication, 6th Edition, Section 4.8 Scalloping, pp. 235-253, January 2018 Summary of the Invention [Problem to be solved by the invention]

[0006] In the welding of the beam web having the compound arc-shaped scallop to the beam flange, after the box welding, it is necessary to use a grinder or the like to grind the box-welded area of ​​the beam flange to make it smooth. This work requires advanced skills and is time-consuming to manufacture.

[0007] The present invention has been made in consideration of the above-mentioned problems, and aims to provide an H-shaped steel beam that can improve manufacturing efficiency while reducing the concentration of stress and strain at the bottom of the scallop, thereby improving the deformation performance of the beam end, and a manufacturing method thereof. [Means for solving the problem]

[0008] An H-shaped steel beam according to one aspect is a welded H-shaped steel beam having a beam web and a beam flange, the beam web has a scallop at one end joined to another structure and at the end continuing to the beam flange, the beam flange has a groove at one end joined to another structure, and the distance in the extension direction of the beam flange from the shoulder of the groove to the end on the proximal side relative to the one end joined to the other structure is defined as L. b When this is done, the distance L b is characterized by satisfying the following equation (1):

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[0009] Furthermore, a welded H-shaped steel beam is formed by welding a beam web and a beam flange together, and it is preferable that, in the extension direction of the beam flange, the intersection between the end face of the beam web facing the scallop and the inner surface of the beam flange coincides with the position of the end closest to the one end joined to another structure, of the two end portions of the welded portion between the beam flange and the beam web.

[0010] In addition, it is preferable that the angle formed between the end face facing the scallop and the inner surface of the beam flange is 90° or less.

[0011] Further, an H-shaped steel beam from another aspect is a rolled H-shaped steel beam having a beam web and a beam flange, the beam web has a scallop at one end connected to the beam flange at one end joined to another structure, the beam flange has a groove at one end joined to another structure, and the distance in the extension direction of the beam flange from the shoulder of the groove to the scallop bottom where the end face of the beam web facing the scallop and the inner surface of the beam flange intersect is defined as L. b ', the distance L b ' is characterized by satisfying the following equation (2):

number

[0012] In addition, a manufacturing method of an H-shaped steel beam according to one aspect is a manufacturing method of a welded H-shaped steel beam having a beam web and a beam flange, in which the beam web has a scallop at one end joined to another structure and at an end continuing to the beam flange, and the beam flange has a groove at one end joined to another structure, and the distance in the extending direction of the beam flange from the shoulder of the groove to the end on the proximal side of the one end joined to the other structure, among both ends in the extending direction of the beam flange of the beam web at the welded portion between the beam flange and the beam web, is defined as L.b When this is done, the distance L b The beam web and the beam flange are generated so that the following equation (3) is satisfied:

number

[0013] In addition, it is preferable to weld the beam flange and the beam web so that, in the extension direction of the beam flange, the end of the welded portion between the beam flange and the beam web that is located proximal to the end that is joined to another structure coincides with the position where the end face of the beam web facing the scallop intersects with the inner surface of the beam flange.

[0014] It is also preferable to weld the beam web and the beam flange together with a range defining member that defines the welding range being abutted against each of the end face of the beam web facing the scallop and the inner surface of the beam flange.

[0015] Another aspect of the manufacturing method of an H-shaped steel beam is a manufacturing method of a rolled H-shaped steel beam having a beam web and a beam flange, wherein the beam web has a scallop at one end connected to the beam flange at the end joined to another structure, and the beam flange has a groove at the one end joined to the other structure, and the distance in the extending direction of the beam flange from the shoulder of the groove to the scallop bottom where the end face of the beam web facing the scallop and the inner surface of the beam flange intersect is defined as L. b ', the distance L b The beam web and the beam flange are generated so that ' satisfies the following equation (4).

number

[0016] In addition, after the rolled H-shaped steel beam is produced by rolling, it is preferable to produce scallops and grooves using a dedicated processing machine. [Effects of the Invention]

[0017] According to the present disclosure, in an H-shaped steel beam having scallops, it is possible to improve manufacturing efficiency while reducing the concentration of stress and strain at the bottom of the scallops, thereby improving the deformation performance of the beam end. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a schematic diagram showing an example of the configuration of an end portion of a welded H-shaped steel beam according to this embodiment. [Figure 2] FIG. 2 is an enlarged view showing an example of the structure of the lower end portion of a welded H-shaped steel beam. [Figure 3] FIG. 3 is a schematic diagram showing an example of a joint structure between a column and an H-shaped steel beam, in which a shear plate fixed to the column is joined to the beam web. [Figure 4] FIG. 4 is a schematic diagram showing an example of a joint structure in which a column and an H-shaped steel beam are welded together. [Figure 5] FIG. 5 is a schematic diagram showing an example of the positions of the welded portions between the beam web and the beam flange. [Figure 6] FIG. 6 is an end view taken along line AA in FIG. [Figure 7] FIG. 7 is a schematic diagram showing an example of a manufacturing process for a welded H-shaped steel beam. [Figure 8] FIG. 8 is a schematic end view showing an example of a yield line that occurs when the distance from the groove shoulder to the end on the proximal side of the welded portion between the beam web and the beam flange is increased. [Figure 9]FIG. 9 is a schematic end view showing an example of a yield line that occurs when the distance from the groove shoulder to the proximal end of the welded portion between the beam web and the beam flange is shortened. [Figure 10] FIG. 10 is a schematic diagram showing an example of the configuration of a T-shaped frame used as a test specimen. [Figure 11] Figure 11 is a schematic diagram showing an example of a scallop formed so that the opposing end faces are a combination of an arc-shaped end face and a wall surface that forms an acute angle with the inner surface of the beam flange. DETAILED DESCRIPTION OF THE INVENTION

[0019] The H-shaped steel beam shown in this embodiment will be described below with reference to the drawings. In this embodiment, a welded H-shaped steel beam will be described as an example of the H-shaped steel beam. FIG. 1 is a schematic diagram showing an example of the configuration of the end of a welded H-shaped steel beam in this embodiment. FIG. 2 is an enlarged view showing an example of the structure of the lower end of a welded H-shaped steel beam. FIGS. 1 and 2 illustrate a welded H-shaped steel beam in which a pair of beam flanges are arranged above and below a beam web. In the following description, the welded H-shaped steel beam may be simply referred to as an H-shaped steel beam.

[0020] The H-shaped steel beam 10 is composed of a beam web 11 and a pair of beam flanges 12, 13. Of the pair of beam flanges 12, 13, the beam flange 12 is welded to the lower end of the beam web 11, and the beam flange 13 is welded to the upper end of the beam web 11.

[0021] In the extension direction of the beam web 11 (the Y-axis direction in FIG. 1), a scallop 14 is provided at the lower end of the beam web 11 at the end joined to the column 51 (see FIG. 3). The shape of the scallop 14 is, for example, a combination of a quarter-circular arc 14a and a rectangle 14b. The angle θ1 formed between the end face 14c facing the scallop 14 and the inner surface 12b of the beam flange 12 is, for example, 90°.

[0022] In addition, a scallop 15 is provided at the upper end of the beam web 11 at the end joined to the column 51 in the extension direction of the beam web 11. The shape of the scallop 15 is the same as the shape of the scallop 14. Note that the scallops 14 and 15 are symmetrical with respect to a straight line CL that passes through the midpoint of the beam web 11 in the width direction (Z-axis direction in FIG. 1) and is parallel to the extension direction of the beam web 11.

[0023] A plurality of insertion holes 23 are arranged in a matrix at the end of the beam web 11. Note that FIG. 1 illustrates an example in which seven insertion holes 23 are provided in the width direction of the beam web 11 and two in the extension direction of the beam web 11, for a total of 14 insertion holes 23, but the number of insertion holes 23 is not limited to this. As shown in FIG. 3, bolts 53 are inserted into the insertion holes 23 to be used when joining the beam web 11 to a shear plate 52 fixed to a column 51. Note that, as shown in FIG. 4, if the shear plate 52 is not joined to the beam web 11, there is no need to provide the insertion holes 22 in the beam web 11.

[0024] 1 and 2, the beam flanges 12, 13 are elongated members welded to, for example, the widthwise ends of the beam web 11. Hereinafter, in the beam flanges 12, 13 welded to both widthwise ends of the beam web 11, the surfaces that the beam flanges 12, 13 face will be referred to as the inner surface, and the surface opposite the inner surface will be referred to as the outer surface.

[0025] Of these beam flanges 12, 13, a groove 25 is provided at the end of the beam flange 12 located below in the extension direction (Y-axis direction in FIG. 1) from the end face 12a to the inner face 12b of the beam flange 12. The groove 25 is inclined from the outer face 12c of the beam flange 12 toward the inner face 12b. Furthermore, a groove 26 is provided at the end of the beam flange 13 located above from the end face 13a to the outer face 13c of the beam flange 13.

[0026] The grooves 25, 26 provided in the beam flanges 12, 13 are provided to obtain the necessary penetration amount in the welded joint between the column 51 (see FIG. 3 or FIG. 4) and the beam flanges 12, 13. In other words, by providing the grooves 25, 26, the strength of the area where the column 51 and the beam flanges 12, 13 are welded and joined (hereinafter referred to as the welded area) is ensured.

[0027] The shapes of the grooves 25, 26 provided in the beam flanges 12, 13 (the angles of the grooves 25, 26, the depths of the grooves 25, 26, etc.) are set appropriately based on the strength of the welded portions, etc.

[0028] When performing the above-mentioned welding joint between the beam web 11 and the beam flange 12, and between the beam web 11 and the beam flange 13, the ceramic tab 30 is abutted against each of the end face 14c of the scallop 14 and the inner surface 12b of the beam flange 12.

[0029] The ceramic tab 30 is a member that defines the positions of the ends P3 and P3' proximal to the welded portions 41a and 41b in the extension direction of the H-shaped steel beam (the Y-axis direction in FIG. 1). Similarly, the ceramic tab 30 is a member that defines the positions of the ends (not shown) proximal to the welded portions 42a and 42b. The ceramic tab 30 is a refractory material formed by adding a binder to powder mainly composed of silicon dioxide and several types of metal oxides, forming the powder into a flat plate, and firing it at 1000°C or higher. Here, the ceramic tab 30 corresponds to the range-defining member recited in the claims. While the ceramic tab 30 is shown as an example of the range-defining member, a steel tab can also be used.

[0030] 5 and 6, when the ceramic tab 30 abuts against each of the end face 14cb of the scallop 14 and the inner surface 12b of the beam flange 12, one end 30a of the ceramic tab 30 protrudes from the end face 11c of the beam web 11, and at the same time, the other end 30b of the ceramic tab 30 protrudes from the end face 11d opposite to the end face 11c of the beam web 11. When the beam web 11 and the beam flange 12 are welded together, the ceramic tab 30 is held in a state abutting against each of the end face 14c of the scallop 14 and the inner surface 12b of the beam flange 12, and is removed after the above-mentioned welding is completed.

[0031] In the height direction of the H-shaped steel beam 10 (Z-axis direction in FIG. 5), the height of the ceramic tab 30 is longer than the distance from the inner surface 12b of the beam flange 12 to the toes P1, P1' of the end faces 11c, 11d of the beam web 11. In addition, in the width direction of the H-shaped steel beam 10 (X-axis direction in FIG. 5), the amount of protrusion of both ends 30a, 30b of the ceramic tab 30 from the beam web 11 is longer than the distance from the end faces 11c, 11d of the beam web 11 to the toes P2, P2' of the welded portions 41a, 41b on the inner surface 12b of the beam flange 12.

[0032] According to this, the positions of the proximal ends P3, P3' in the extension direction of the H-shaped steel beam 10 are defined in the weld metal deposited by welding the beam flange 12 and the beam web 11 together.

[0033] The above-mentioned H-shaped steel beam 10 is manufactured by the following manufacturing method. First, as shown in Fig. 7(a), the inner surface 12b of the lower beam flange 12 is abutted against the lower end surface 11a of the beam web 11. In this state, the ceramic tab 30 is abutted against each of the end surface 14c of the scallop 14 and the inner surface 12b of the beam flange 12.

[0034] As shown in Figure 7(b), with the ceramic tab 30 abutting against the end face 14c of the scallop 14 and the inner surface 12b of the beam flange 12, the beam web 11 and the beam web 12 are welded together using a welding machine 45. Here, methods such as gas shielded arc welding and submerged arc welding are used to weld the beam web 11 and the beam flange 12 together. After the weld-joining, the ceramic tab 30 is removed.

[0035] 6, of the two ends of the welded portions 41a, 41b in the extension direction of the beam web 11, the ends P3, P3' that are proximal to the end of the H-shaped steel beam 10 that joins to the column 51 and the scallop bottom 14d, which is the portion where the end face 14c of the scallop 14 and the inner surface 12b of the beam flange 12 abut, are in the same position. Hereinafter, of the two ends of the welded portions 41a, 41b in the extension direction of the beam web 11, the ends that are proximal to the end of the H-shaped steel beam 10 that joins to the column 51 may be referred to as "ends P3, P3'."

[0036] After the beam web 11 and the beam flange 12 are welded together, as shown in FIG. 7(c), the beam web 11 and the beam flange 13 are welded together in the same procedure as the welding of the beam web 11 and the beam flange 12.

[0037] Although the beam flange 12 and the beam flange 13 are welded to the beam web 11 in this order, the order in which they are welded to the beam web 11 does not have to be limited to this.

[0038] Next, the positions of the ends P3 and P3' will be described. Generally, the boundary between the ends P3 and P3' and the inner surface 12b of the beam flange 12 is geometrically discontinuous, and stress and strain tend to concentrate locally in this area. As a result, the boundary between the ends P3 and P3' and the inner surface 12b of the beam flange 12 tends to become the starting point for plastic deformation and cracks.

[0039] Here, in the H-shaped steel beam 10 using the beam flange 12 with the groove 25 formed on the inside, the distance from the shoulder portion (hereinafter referred to as the groove shoulder) 25a of the groove 25 of the beam flange 12 to the ends P3 and P3' is L b Let's say.

[0040] For example, distance L b is long, that is, when the ends P3 and P3' are moved away from the groove shoulder 25a of the H-shaped steel beam 10, a plasticized region of the beam flange 12 is secured, and the plastic strain on the inner surface 12b of the beam flange 12 is dispersed. Therefore, the cracks generated at the ends P3 and P3' propagate in the width direction of the beam flange 12, following the propagation path of the yield lines L1 and L1' shown in Figure 8, and the beam flange 12 fractures.

[0041] On the other hand, the distance L b When the length P3, P3' is short, that is, when the ends P3, P3' are close to the groove shoulder 25a of the H-shaped steel beam 10, the plasticized region of the beam flange 12 generated around the ends P3, P3' is concentrated in a position close to the groove shoulder 25a of the H-shaped steel beam 10, and the plastic strain of the inner surface 12b of the beam flange 12 is difficult to distribute. In addition, both ends 61a, 61b of the welded portion 61 between the beam flange 12 and the column 51 are discontinuous in shape, and stress and strain tend to concentrate locally at both ends 61a, 61b of the welded portion 61.

[0042] As a result, the cracks that occur at the ends P3 and P3' not only propagate in the thickness direction of the beam flange 12, but also connect with cracks at both ends 61a and 61b of the welded portion 61 between the beam flange 12 and the column 51, following the propagation path of the yield lines L2 and L2' shown in Figure 9, causing the beam flange 12 to fracture.

[0043] In order to obtain excellent plastic deformation performance of the H-shaped steel beam 10, it is necessary to separate the ends P3 and P3' from the groove shoulder 25a of the H-shaped steel beam 10 so that the yield line L2 occurs before the yield line L1. b is set to satisfy the following equation (5).

[0044]

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[0045] Here, the fully plastic bending moment M p1 can be calculated using the following equation (6) based on the condition that the entire cross section of the beam flanges 12, 13 at the yield lines L1, L1' reaches the yield stress σy.

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[0046] In addition, in the present invention, the fully plastic bending moment M p2 was newly derived by applying the plane stress state and the Mises yield criterion to the entire cross section of the beam flanges 12 and 13 at the yield lines L2 and L2'. p2 is shown in the following equation (7).

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[0047] However, the above-mentioned full plastic bending moment M p1 ,M p2 is a value obtained by ignoring the stress on the beam web 11, that is, the stress is not easily transmitted to the beam web 11 due to the influence of deformation of the column 51, etc.

[0048] By substituting the equations (6) and (7) into the above equation (5), the following equation (6) is obtained. Therefore, the distance L b can be calculated from equation (8).

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[0049] By the way, the above-mentioned distance L b If the relationship of either the above formula (3) or formula (6) is satisfied, there is no need to impose a particular limit on the upper limit value. For example, the distance L b As the distance L increases, the area where the inner surface 12b of the beam flange 12 is not restrained by the beam web 11 increases. The increase in the area makes it easier for local buckling to occur in the beam flange 12 when the beam flange 12 is subjected to a compressive force. Therefore, b For example, it is preferable that the distance is 250 mm or less.

[0050] In order to demonstrate the effects of the present invention, a structural test and a finite element analysis were carried out using a T-shaped frame (see FIG. 10) consisting of a square steel pipe column 71 and an H-shaped steel beam 72 as a test specimen 70. Hereinafter, an example in which the H-shaped steel beam 10 described in this embodiment is used as the H-shaped steel beam 72 will be referred to as an invention example.

[0051] The H-shaped steel beam 10 used in the specimens and analysis models of the invention examples is made of SN490B steel, and the dimensions of the H-shaped steel beam 10 are H-600 x 200 x 16 x 25 (unit: mm).

[0052] In the example of the invention, the distance L from the groove shoulder 25a of the beam flange 12 to the ends P3 and P3' is b The distance L b is a value that satisfies the above-mentioned equation (6).

[0053] In addition, a case where an H-shaped steel beam using a composite circular scallop as recommended in Non-Patent Document 1 was used as the above-mentioned H-shaped steel beam 72 was used as an example (hereinafter referred to as a comparative example) for comparison with the above-mentioned invention example, and structural experiments and finite element analysis similar to those of the invention example were carried out. b was set at just under 10 mm.

[0054] The structural test was carried out to verify that the H-shaped steel beam 10 had a full plastic bending strength M p This test involves applying a stress σ to the H-shaped steel beam 10, alternating between positive and negative, to produce a displacement (=3δp) that is three times the displacement δp of the free end of the beam when the displacement reaches δp, and measuring the number of cycles until fracture. The finite element method analysis is used to determine the maximum value of plastic strain when stress σ is monotonically applied until the displacement of the free end of the H-shaped steel beam 10 reaches 3δp.

[0055] In the structural test, the number of cycles to fracture Nf in the comparative example was Nf = 5. On the other hand, the number of cycles to fracture Nf in the inventive example was Nf = 10. That is, the distance L that satisfies the above-mentioned formula (8) b It was found that in this case, the plastic deformation performance of the H-shaped steel beam 10 is improved.

[0056] Furthermore, in the finite element analysis, the maximum value of equivalent plastic strain in the comparative example was 0.29. On the other hand, the maximum value of equivalent plastic strain in the inventive example was 0.25. That is, the distance L b It was found that by setting the above, the equivalent plastic strain occurring on the inner surface 12b of the beam flange 12 is reduced.

[0057] As described above, from the results of the structural test and the finite element method analysis, the distance L from the groove shoulder 25a of the beam flange 12 to the ends P3 and P3' is b It has been demonstrated that by setting the above equation (6) to satisfy, the concentration of stress and strain at the ends P3 and P3' is alleviated, and excellent plastic deformation performance of the H-shaped steel beam 10 is obtained.

[0058] In this embodiment, the angle θ1 between the end face 14c facing the scallop 14 and the inner surface 12b of the beam flange 12 is set to θ1 = 90°. However, as shown in Fig. 11, the end face 82 facing the scallop 81 can be set to an arc-shaped end face 82a and an end face 82b connected to the end face 82a, and the angle θ2 between the end face 82b and the inner surface 12b of the beam flange 12 can be set to θ2 ≦ 90°.

[0059] On the other hand, if the angle θ2 between the end face 14c facing the scallop 14 and the inner surface 12b of the beam flange 12 is set to, for example, θ2≦90°, not only will it be easier to process the scallop 81 provided on the beam web 11, but it will also be easier to stack welding passes at the welded portion between the beam flange 12 and the beam web 11, thereby improving the manufacturing efficiency of welded H-shaped steel beams.

[0060] In this embodiment, the details of the column 51 to which the H-shaped steel beam 10 is joined are not described. However, the column 51 may be, for example, a column having a polygonal or box-shaped cross section perpendicular to the extending direction of the column. Also, the column may be made of a circular steel pipe or an H-shaped steel. Furthermore, the column does not have to be limited to a steel frame, but may be a concrete-filled steel pipe in which concrete is filled inside the steel frame to enhance earthquake resistance. Furthermore, the column may be a steel-framed reinforced concrete column, which is a composite structure of steel and concrete.

[0061] Furthermore, the connection between the H-shaped steel beam and the column is basically an internal diaphragm type. However, there are no particular restrictions on this connection type, and other connection types such as through diaphragm type and external diaphragm type can also be used.

[0062] In this embodiment, a welded H-shaped steel beam 10 is used as an example of an H-shaped steel beam, in which a beam web 11 and a pair of beam flanges 12, 13 are welded together. However, the H-shaped steel beam having a beam web with a scallop and a beam flange with a groove is not limited to the welded H-shaped steel beam 10, and may be an H-shaped steel beam produced by rolling, for example. In this case, the distance L from the groove shoulder to the scallop bottom is b ' is set so as to satisfy the following equation (9).

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[0063] <Summary of effects> The H-shaped steel beam 10 of this embodiment is a welded H-shaped steel beam having a beam web 11 and a beam flange 12. The beam web 11 has a scallop 14 at one end joined to another structure and connected to the beam flange 12. The beam flange 12 has a groove 25 at one end joined to another structure. In the extension direction of the beam flange 12, the distance from the groove shoulder 25a to the ends P3, P3' that are closer to the one end joined to the other structure, among both ends in the extension direction of the beam web 11 of the welded portion between the beam flange 12 and the beam web 11, is defined as L. b When this is done, the distance L b is characterized by satisfying the above equation (8).

[0064] This reduces the concentration of stress and strain at the scallop bottom 14d and the ends P3, P3', and therefore makes it possible for the H-shaped steel beam 10 to obtain excellent plastic deformation performance.

[0065] Furthermore, even if the H-shaped steel beam 10 is a rolled H-shaped steel beam, it is possible to obtain the same effects as a welded H-shaped steel beam.

[0066] Furthermore, the H-shaped steel beam 10 is formed by welding the beam web 11 and the beam flange 12 together, and in the extension direction of the beam flange 12, it is preferable that the position of the end P3, P3' proximal to the one end joined to another structure, among the two end portions of the welded portions 41a, 41b between the beam flange 11 and the beam web 12, coincides with the position of the scallop bottom 14d.

[0067] This allows for the omission of turn welding work on the scallop bottom 14d and cutting work using a grinder or the like when welding, thereby significantly improving the manufacturing efficiency of H-shaped steel beams. [Explanation of symbols]

[0068] 10 H-shaped steel beam 11 Beam Web 12,13 Beam flange 14 Scallop 25 Bevel 25a Bevel shoulder 30 Ceramic tab (area defining member) 41a, 41b Welded parts L1,L2 yield line L b Distance from the groove shoulder to the proximal edge of the weld P3, P3' The end of the welded part located on the proximal side

Claims

1. A welded H-shaped steel beam having a beam web and a beam flange, The beam web has a scallop at one end connected to another structure and at an end connected to the beam flange, The beam flange has a groove at one end to be joined to the other structure, In the extension direction of the beam flange, the distance from the shoulder of the groove to the end that is closer to the end that is joined to another structure among both ends in the extension direction of the beam web of the welded portion of the beam flange and the beam web is L. ｂ When the distance L ｂ A welded H-shaped steel beam characterized by satisfying the following formula (1). [Equation 1] however, Symbol L: The distance in the extension direction from the inflection point of the bending moment acting in the extension direction of the H-shaped steel beam to the shoulder of the groove provided in the beam flange. Symbol B ｂ : Beam flange width is.

2. The welded H-shaped steel beam is formed by welding the beam web and the beam flange together, A welded H-shaped steel beam as described in claim 1, characterized in that in the extension direction of the beam flange, the intersection between the end face of the beam web facing the scallop and the inner surface of the beam flange coincides with the position of the end closest to the one end joined to the other structure, of both end portions of the welded portion between the beam flange and the beam web.

3. 2. A welded H-shaped steel beam according to claim 1, wherein the angle formed between the end face facing the scallop and the inner surface of the beam flange is 90° or less.

4. A rolled H-shaped steel beam having a beam web and a beam flange, The beam web has a scallop at one end connected to another structure and at an end connected to the beam flange, The beam flange has a groove at one end to be joined to the other structure, In the extension direction of the beam flange, the distance in the extension direction from the shoulder of the groove to the scallop bottom where the end face of the beam web facing the scallop and the inner surface of the beam flange intersect is L ｂ ', the distance L ｂ ' is a rolled H-shaped steel beam characterized by satisfying the following formula (2). [Equation 2] however, Symbol L: The distance in the extension direction from the inflection point of the bending moment acting in the extension direction of the H-shaped steel beam to the shoulder of the groove provided in the beam flange. Symbol B ｂ : Beam flange width is.

5. A method for manufacturing a welded H-shaped steel beam having a beam web and a beam flange, The beam web has a scallop at one end connected to another structure and at an end connected to the beam flange, The beam flange has a groove at one end to be joined to the other structure, In the extension direction of the beam flange, the distance from the shoulder of the groove to the end that is closer to the end that is joined to another structure among both ends in the extension direction of the beam web of the welded portion of the beam flange and the beam web is L. ｂ When the distance L ｂ A method for manufacturing a welded H-shaped steel beam, characterized in that the beam web and the beam flange are produced so that the following formula (3) is satisfied. [Equation 3] however, Symbol L: The distance in the extension direction from the inflection point of the bending moment acting in the extension direction of the H-shaped steel beam to the shoulder of the groove provided in the beam flange. Symbol B ｂ : Beam flange width is.

6. The method for manufacturing a welded H-shaped steel beam as described in claim 5, characterized in that the beam flange and the beam web are welded together so that, in the extension direction of the beam flange, the end of the welded portion between the beam flange and the beam web that is located proximal to the one end that is joined to the other structure coincides with the position of the scallop bottom.

7. A method for manufacturing a welded H-shaped steel beam as described in claim 5, characterized in that the beam web and the beam flange are welded together with a range-defining member that defines the welding range being abutted against each of the end face of the beam web facing the scallop and the inner surface of the beam flange.

8. A method for manufacturing a rolled H-shaped steel beam having a beam web and a beam flange, The beam web has a scallop at one end connected to another structure and at an end connected to the beam flange, The beam flange has a groove at one end to be joined to the other structure, In the extension direction of the beam flange, the distance in the extension direction from the shoulder of the groove to the scallop bottom where the end face of the beam web facing the scallop and the inner surface of the beam flange intersect is L ｂ ', the distance L ｂ A method for manufacturing a rolled H-shaped steel beam, characterized in that the beam web and the beam flange are generated so that ' satisfies the following equation (4). [Equation 4] however, Symbol L: The distance in the extension direction from the inflection point of the bending moment acting in the extension direction of the H-shaped steel beam to the shoulder of the groove provided in the beam flange. Symbol B ｂ : Beam flange width is.

9. The method for manufacturing a rolled H-shaped steel beam according to claim 8, characterized in that after the rolled H-shaped steel beam is produced by the roll rolling process, the scallop and the groove are formed using a dedicated processing machine.

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