JP7622722B2 - Joint structure between box-section column and H-shaped steel beam and manufacturing method for joint structure - Google Patents

Description

The present invention relates to a joint structure between a column and a beam in a building and a manufacturing method for the joint structure, and in particular to a joint structure between a box section column and an H-shaped steel beam and a manufacturing method for the joint structure.

In super-high rise steel buildings, welded assembled box columns consisting of four skin plates joined together by corner welding are often used. At the joint between the box column and the H-shaped steel beam, when a horizontal force acts on the building during an earthquake, for example, stress is transmitted from the flange of the H-shaped steel beam to the skin plate of the box column. To prevent localized deformation of the skin plate of the box column due to this stress, it is common to install a horizontal stiffener called a diaphragm on the box column at the same height as the flange of the H-shaped steel beam.

The joints between box-section columns and H-shaped steel beams can be broadly classified into three types: the internal diaphragm type, which uses an internal diaphragm; the through diaphragm type, which uses a through diaphragm; and the external diaphragm type, which uses an external diaphragm.

Of these, the internal diaphragm type is most commonly used for the joint between a box column and an H-shaped steel beam. Figures 6(a) and 6(b) show a perspective view and a plan view of a joint between a box column 81 and an H-shaped steel beam 82 using the internal diaphragm type. Figures 7 and 8 show longitudinal cross-sectional views of the main parts of a joint between a box column 81 and an H-shaped steel beam 82 using the internal diaphragm type. As shown in Figures 7 and 8, the skin plate 811 and the internal diaphragm 84 of the box column 81 are generally joined by electroslag welding.

Specifically, in the process of assembling the skin plates 811 to manufacture the box-shaped cross-section column 81, the inner diaphragm 84 is installed inside the box-shaped cross-section column 81. Then, as shown in FIG. 7, both sides of the gap between the back surface of the skin plate 811 and the end surface of the inner diaphragm 84 are surrounded by a backing metal 841 to provide a welding hole 842 having a rectangular cross-section. Furthermore, a molten slag bath is formed in the welding hole 842, and the molten slag is heated by resistance heating by feeding a welding wire into the molten slag bath while supplying current from the welding wire. In this way, while applying a large heat input of up to several million J/cm, as shown in FIG. 8, the base material around the welding hole 842 is melted and the welding hole 842 is filled with molten metal. Electroslag welding is extremely efficient compared to manual or semi-automatic gas-shielded arc welding.

However, because the inner diaphragm 84 and the backing plate 841 must be joined to the inside of the box-shaped cross-section column 81, it is difficult to ensure the assembly precision of the root spacing 84G between the skin plate 811 of the box-shaped cross-section column 81 and the inner diaphragm 84, and the backing plate 841, etc.

Figures 9(a) and 9(b) show a perspective view and a plan view of a through diaphragm type joint between a box column 81 and an H-shaped steel beam 82. As shown in Figures 9(a) and 9(b), in the through diaphragm type joint between a box column 81 and an H-shaped steel beam 82, a through diaphragm 85 is provided so as to penetrate the cross section of the box column 81. The through diaphragm type joint between a box column and an H-shaped steel beam is assembled by cutting the box column 81 at the position where the through diaphragm 85 is to be provided, inserting the through diaphragm 85 into the cut position, and welding the box column 81 and the through diaphragm 85 together.

Here, the weld 86 between the box section column 81 and the through diaphragm 85 is a full penetration weld, so that the performance of the box section column 81 is ensured even if the through diaphragm 85 is provided so as to penetrate the cross section of the box section column 81.

However, as mentioned above, the assembly of the joint between the box column and the H-shaped steel beam using the through diaphragm type is performed by cutting the box column 81 at the position where the through diaphragm 85 is to be installed, inserting the through diaphragm 85 at the cut position, and welding the box column 81 and the through diaphragm 85 together. Therefore, it takes time and effort to cut the box column 81 and to prepare the groove for full penetration welding of the box column 81 to the through diaphragm 85, and the amount of welding tends to be large. In addition, high skill is required to ensure precision, such as aligning the box column 81 to be joined above and below the through diaphragm 85.

Furthermore, buildings are designed with the through diaphragm 85, which is provided to penetrate the cross section of the box column 81, constituting part of the box column 81. As a prerequisite for this design, the weld 86 between the box column 81 and the through diaphragm 85 must use welding material with a strength equal to or greater than that of the box column 81, which tends to increase material costs and construction load. The box columns 81, which are often used in high-rise buildings, often use high-strength steel, and it becomes necessary to use high-strength welding material with a strength class equal to or greater than that of the box column 81 for the weld 86 between the box column 81 and the through diaphragm 85.

Figures 10(a) and 10(b) show a perspective view and a plan view of a joint between a box column and an H-shaped steel beam using an external diaphragm. As shown in Figures 10(a) and 10(b), in a joint between a box column and an H-shaped steel beam using an external diaphragm, the box column 81 and the external diaphragm 83 are welded from the outside of the box column 81. This makes it easy to attach the external diaphragm 83 to the box column 81, and ensures assembly accuracy between the components. Furthermore, since no diaphragm is inserted inside the box column 81, it is also easy to work with when filling the inside of the box column 81 with concrete.

Figures 11 to 13 show longitudinal cross-sectional views of the main parts of a joint between a box column 81 and an H-shaped steel beam 82 using an external diaphragm. Figure 11 shows an example in which the weld 87 between the box column 81 and the external diaphragm 83 is a fillet weld. Figure 12 shows an example in which the weld 88 between the box column 81 and the external diaphragm 83 is a full penetration weld. Figure 13 shows an example in which the weld 89 between the box column 81 and the external diaphragm 83 is a partial penetration weld.

The box-shaped column 81 and the outer diaphragm 83 are generally joined by fillet welding as shown in FIG. 11, or by full penetration welding or partial penetration welding after groove preparation on the outer diaphragm 83 as shown in FIG. 12 and FIG. 13. Semi-automatic gas-shielded arc welding is used for these fillet welding, full penetration welding and partial penetration welding. However, when a large-section H-shaped steel beam 2 is used, the stress acting on the skin plate 811 of the box-shaped column 81 from the flange 821 of the H-shaped steel beam 82 during an earthquake or the like becomes large, and the thickness of the outer diaphragm 83 must be increased in order to prevent local deformation of the skin plate 811 of the box-shaped column 81. The thicker the outer diaphragm 83 is, the more passes are required for gas-shielded arc welding, which tends to result in lower manufacturing efficiency compared to electroslag welding used in the inner diaphragm type.

Furthermore, as shown in FIG. 10(b), in the joint between a box section column 81 and an H-shaped steel beam 82 using an external diaphragm, the protruding width 83h of the external diaphragm 83 from the skin plate 811 of the box section column 81 is often made large in order to ensure the strength of the column-beam joint. Therefore, when a box section column 81 with an external diaphragm 83 attached is manufactured in a steel frame manufacturing factory and transported to a construction site, if the protruding width 83h of the external diaphragm 83 is large, the number of box section columns 81 that can be loaded onto a transport vehicle at one time is limited, which tends to reduce transport efficiency.

Therefore, Patent Documents 1 and 2 propose an external diaphragm that can ensure the strength of the column-beam joint while reducing the protruding width of the external diaphragm, and a column-beam joint structure using the same.

Specifically, Patent Document 1 proposes using a sleeve-shaped outer diaphragm formed by bending flat steel outward so that it fits the outer periphery of a square steel pipe column, thereby reducing the planar shape compared to conventional outer diaphragms.

Patent Document 2 also proposes combining four L-shaped steel pieces to form an outer diaphragm, and using a thicker material for the L-shaped steel pieces to reduce the dimensions of the outer diaphragm. The L-shaped steel pieces are joined together by fillet welding or partial penetration welding on the front and back surfaces.

JP 2006-002351 A JP 2016-108868 A

Here, to ensure the quality of the weld between the box section column or square steel pipe column and the external diaphragm, it is necessary to ensure the root spacing between the square steel pipe column and the external diaphragm with appropriate precision. If the root spacing is too small, welding defects are more likely to occur, and if the root spacing is too large, the amount of welding increases, deteriorating workability. However, in Patent Document 1, localized residual stress occurs in the flat steel when bending the flat steel out of the plane, which makes it difficult to ensure dimensional precision when manufacturing the external diaphragm and assembly precision when attaching the external diaphragm to the box section column or square steel pipe column.

In addition, Patent Documents 1 and 2 are based on the premise that the box section column or square steel pipe column and the outer diaphragm are joined by gas-shielded arc fillet welding, or by partial penetration welding after groove preparation on the outer diaphragm. Therefore, there is an issue of lower manufacturing efficiency compared to electroslag welding used in the inner diaphragm type.

The present invention was made to solve these problems, and aims to provide a joint structure between a box section column and an H-shaped steel beam, and a manufacturing method for the joint structure, that has excellent manufacturing efficiency and ensures the assembly precision between the components.

To solve the above problems, the present invention has the following features:

[1] A joint structure between a box column and an H-shaped steel beam, in which an H-shaped steel beam is joined via an outer diaphragm to a welded assembled box column composed of four skin plates joined together by corner welding, in which a welding hole surrounded by a metal is provided between the surface of the skin plate and the end face of the outer diaphragm, and the box column and the outer diaphragm are joined by a weld formed by filling the welding hole with molten metal by electroslag welding.

[2] The joining structure of a box section column and an H-shaped steel beam described in [1], in which a partition wall made of a steel piece is provided inside the welding hole so that the welding hole is divided into two or more holes in the thickness direction of the outer diaphragm.

[3] A joint structure between a box section column and an H-shaped steel beam described in [1] or [2], in which the yield strength of the outer diaphragm is greater than the yield strength of the flange of the H-shaped steel beam.

[4] A manufacturing method for a joint structure between a box column and an H-shaped steel beam, in which an H-shaped steel beam is joined via an external diaphragm to a welded assembled box column composed of four skin plates joined together by corner welding, in which a welding hole is provided by surrounding the area between the surface of the skin plate and the end face of the external diaphragm with a metal strip, and the welding hole is filled with molten metal by electroslag welding with a heat input of 100 to 1500 kJ/cm to form a weld, thereby joining the box column and the external diaphragm.

[5] A method for manufacturing a joint structure between a box section column and an H-shaped steel beam described in [4], in which a partition wall made of a steel piece is provided inside the welding hole so that the welding hole is divided into two or more holes in the thickness direction of the outer diaphragm.

[6] A method for manufacturing a joint structure between a box section column and an H-shaped steel beam described in [4] or [5], in which the yield strength of the outer diaphragm is greater than the yield strength of the flange of the H-shaped steel beam.

In the joint structure between a box column and an H-shaped steel beam and the manufacturing method of the joint structure according to the present invention, the box column and the external diaphragm are joined by electroslag welding. Therefore, compared to the joint structure between a box column and an H-shaped steel beam using the general external diaphragm type, which is joined by gas-shielded arc welding, the manufacturing efficiency can be significantly improved.

In addition, in the joint structure between a box column and an H-shaped steel beam and the manufacturing method of the joint structure according to the present invention, electroslag welding between the box column and the outer diaphragm is performed from outside the box column. This ensures assembly precision for the root spacing between the surface of the skin plate of the box column and the end face of the outer diaphragm, the backing metal, etc.

FIG. 1 is a vertical cross-sectional view showing a main part of a joint structure between a box section column and an H-shaped steel beam according to a first embodiment of the present invention. FIG. 2 is a vertical cross-sectional view showing a main part of a joint structure between a box section column and an H-shaped steel beam according to a first embodiment of the present invention. 3(a) to 3(f) are plan views showing examples of the shapes of the external diaphragms in the joint structure of a box section column and an H-shaped steel beam of the present invention. FIG. 4 is a vertical cross-sectional view showing a main part of a joint structure between a box section column and an H-shaped steel beam according to a second embodiment of the present invention. FIG. 5 is a vertical cross-sectional view showing a main part of a joint structure between a box section column and an H-shaped steel beam according to a second embodiment of the present invention. 6(a) and 6(b) are a perspective view and a plan view showing a joint between a box section column and an H-shaped steel beam using an internal diaphragm type joint. FIG. 7 is a vertical cross-sectional view showing a main part of a joint between a box section column and an H-shaped steel beam using an internal diaphragm. FIG. 8 is a vertical cross-sectional view showing a main portion of a joint between a box section column and an H-shaped steel beam using an internal diaphragm. 9(a) and 9(b) are a perspective view and a plan view showing a through diaphragm type joint between a box section column and an H-shaped steel beam. 10(a) and 10(b) are a perspective view and a plan view showing a joint between a box section column and an H-shaped steel beam using an external diaphragm type. FIG. 11 is a vertical cross-sectional view showing a main part of a joint between a box section column and an H-shaped steel beam using an external diaphragm type joint. FIG. 12 is a vertical cross-sectional view showing a main part of a joint between a box section column and an H-shaped steel beam using an external diaphragm type. FIG. 13 is a vertical cross-sectional view showing a main part of a joint between a box section column and an H-shaped steel beam using an external diaphragm type.

Hereinafter, with reference to the drawings, an embodiment of a joint structure between a box section column and an H-shaped steel beam and a manufacturing method of the joint structure of the present invention will be described in detail.
First Embodiment
1 and 2 show longitudinal sectional views of essential parts of a joint structure between a box section column and an H-shaped steel beam according to a first embodiment of the present invention.

As shown in Figures 1 and 2, the joint structure of the box column and the H-shaped steel beam in this embodiment is a welded assembly box column 1 consisting of four skin plates 11 joined together by corner welding (not shown), to which an H-shaped steel beam 2 is joined via an outer diaphragm 3. Specifically, as shown in Figure 1, a welding hole 32 surrounded by a backing metal 31 is provided between the surface of the skin plate 11 of the box column 1 and the end face of the outer diaphragm 3. Then, as shown in Figure 2, the box column 1 and the outer diaphragm 3 are joined by a weld 5 formed by filling the welding hole 32 with molten metal by electroslag welding.

As shown in FIG. 1, the cross-sectional shape of the electroslag welding hole 4 is rectangular, similar to the electroslag welding hole between the skin plate and the inner diaphragm at the joint between a box section column and an H-shaped steel beam using the inner diaphragm type.

The H-shaped steel beam 2 connected to the box section column 1 can be either rolled H-shaped steel or welded H-shaped steel.

The backing plate 31 can be made of the same steel material as that used in electroslag welding between the skin plate and the inner diaphragm at the joint between the box section column and the H-shaped steel beam using the inner diaphragm type.

Moreover, it is preferable that the yield strength of the exterior diaphragm 3 is greater than the yield strength of the flange of the H-shaped steel beam 2 attached to the exterior diaphragm 3. In this way, the protruding width h d of the exterior diaphragm 3 shown in Fig. ₁ can be reduced without reducing the strength of the beam-column joint against the stress acting on the skin plate 11 of the box section column 1 from the flange 21 of the H-shaped steel beam 2 during an earthquake or the like. Then, when the box section column 1 attached with the exterior diaphragm 3 is manufactured in a steel frame manufacturing factory and transported to a construction site, the transportation efficiency of the box section column 1 is less likely to be impaired by the protruding width h _d of the exterior diaphragm 3.

In the joint structure of the box section column and H-shaped steel beam of this embodiment, the box section column 1 and the external diaphragm 3 are joined by electroslag welding. Therefore, compared to the joint structure of the box section column and H-shaped steel beam using the general external diaphragm type, which is joined by gas shielded arc welding, the manufacturing efficiency can be significantly improved.

In addition, in the joint structure of the box column and H-shaped steel beam according to the present invention, the outer diaphragm 3 is attached to the outside of the box column 1, so electroslag welding between the box column 1 and the outer diaphragm 3 is performed from outside the box column 1. This ensures assembly precision for the root gap G between the surface of the skin plate 11 of the box column 1 and the end face of the outer diaphragm 3, the backing plate 31, and the like.

In addition, the root spacing G between the surface of the skin plate 11 of the box section column 1 and the end face of the external diaphragm 3 in the joint structure of the box section column and the H-shaped steel beam of this embodiment can be set to an appropriate dimension, similar to the root spacing between the inner surface of the box section column and the end face of the internal diaphragm in the joint between the box section column and the H-shaped steel beam using the internal diaphragm type.

Figures 3(a) to 3(f) show various examples of the shape of the external diaphragm 3 (3A to 3C) in the joint structure of the box section column and H-shaped steel beam of this embodiment. As shown in Figures 3(a) to 3(f), the external diaphragm 3 is joined to one to four of the four side faces of the box section column 1 depending on the number of H-shaped steel beams 2 attached to the box section column 1.

Figures 3(a) and 3(b) show examples in which a polygonal steel plate is used as the outer diaphragm 3A. Figures 3(c) and 3(d) show examples in which a rectangular steel plate is used as the outer diaphragm 3B. Figures 3(e) and 3(f) show examples in which a circular arc is included in part of the planar shape of the outer diaphragm 3C. As shown in Figures 3(e) and 3(f), when a circular arc is included in part of the planar shape of the outer diaphragm 3C, stress can be smoothly transmitted from the flange 21 of the H-shaped steel beam 2 to the skin plate 11 of the box-shaped section column 1 via the outer diaphragm. This is preferable because it is possible to suppress the occurrence of cracks and breaks in the outer diaphragm 3.

In addition, the manufacturing method of the joint structure between a box section column and an H-shaped steel beam in this embodiment is realized by performing electroslag welding so that the heat input is 100 to 1500 kJ/cm when manufacturing the joint structure between the box section column 1 and the H-shaped steel beam 2 described above.
Second Embodiment
4 and 5 show longitudinal sectional views of essential parts of a joint structure between a box section column and an H-shaped steel beam according to a second embodiment of the present invention.

As shown in Figures 4 and 5, in the joint structure of the box-shaped column and the H-shaped steel beam of this embodiment, the flange 21 of the H-shaped steel beam 2 and the outer diaphragm 3 are thicker than in the joint structure of the box-shaped column and the H-shaped steel beam of the first embodiment. When electroslag welding with a large heat input is applied to general steel materials for architectural structures, the toughness of the welded part 5 by electroslag welding decreases, and brittle fracture is likely to occur in the welded part 5 due to the stress transmitted from the flange 21 of the H-shaped steel beam 2 to the outer diaphragm 3 during an earthquake. In particular, when the outer diaphragm 3 has a large plate thickness, as in this embodiment, the amount of heat input required to ensure penetration of the weld metal into the members surrounding the welding hole during electroslag welding increases, which is likely to cause a significant decrease in the toughness of the welded part 5.

Therefore, in the joint structure of the box-shaped column and the H-shaped steel beam of this embodiment, as shown in Fig. 4 and Fig. 5, a partition wall 33 made of a steel piece is provided inside the welding hole surrounded by the surface of the skin plate 11 of the box-shaped column 1, the end face of the external diaphragm 3, and the backing metal 31. As a result, the welding hole surrounded by the surface of the skin plate 11 of the box-shaped column 1, the end face of the external diaphragm 3, and the backing metal 31 is divided into two welding holes 34, 35 in the thickness direction of the external diaphragm 3. In this way, the widths _w1 , _w2 of the welding holes 34, 35 in the thickness direction of the external diaphragm 3 can be reduced. That is, even if the thicknesses of the flange 21 of the H-shaped steel beam 2 and the external diaphragm 3 are large, the amount of heat input required to ensure penetration of the weld metal into the members surrounding the welding hole during electroslag welding can be reduced, and a significant decrease in the toughness of the welded portion 5 can be suppressed.

The above describes the embodiment of the joint structure between a box section column and an H-shaped steel beam and the manufacturing method of the joint structure of the present invention, but the specific configuration of the present invention is not limited to the above-mentioned embodiment, and the design can be changed without departing from the gist of the present invention.

For example, although the widths _w1 , _w2 of the welding holes 34, 35 are the same in Fig. 4 and Fig. 5, the widths _w1 , _w2 of the welding holes 34, 35 may be different. Also, although Fig. 4 and Fig. 5 show an example in which the welding hole surrounded by the surface of the skin plate 11 of the box section column 1, the end face of the outer diaphragm 3, and the backing metal 31 is divided into two welding holes 34, 35, the welding hole may be divided into three or more welding holes in the thickness direction of the outer diaphragm 3. It is preferable to appropriately set the number of divisions and width of the welding hole in consideration of the type and dimensions of the steel material used, the welding conditions of the electroslag welding, etc., so that brittle fracture of the welded portion 5 can be effectively suppressed against the stress transmitted from the flange 21 of the H-shaped steel beam 2 to the outer diaphragm 3 during an earthquake or the like.

In the joint structure of the second embodiment between a box section column and an H-shaped steel beam, a partition wall 33 was provided inside the welding hole, dividing the outer diaphragm 3 into two welding holes 34 and 35 in the thickness direction, to verify how much the heat input of electroslag welding could be reduced.

First, calculation examples No. 1 to 5 were set based on the joint structure of the box column and the H-shaped steel beam of the first embodiment shown in Figures 1 and 2. Table 1 shows the outer diameter _Dc of the box column 1 and the plate thickness _tc of the skin plate 11, the protruding width _hd and the plate thickness _td of the outer diaphragm 3, and the root spacing G and width _w0 of the welding hole 32 in each of calculation examples No. 1 to 5.

As shown in Table 1, in calculation examples No. 1 to 5, the outer diameter _Dc of the box section column 1 was changed to five types, namely, 500 mm, 800 mm, 1000 mm, 1200 mm, and 1500 mm. In addition, in calculation examples No. 1 to 5, the plate thickness _tc of the skin plate of the box section column 1, and the protruding width _hd and plate thickness _td of the outer diaphragm 3 were changed to correspond to the size of the outer diameter _Dc of the box section column 1. The root spacing G of the welding hole 32 was set to 23 mm in all calculation examples No. 1 to 5.

The amount of heat input required to ensure penetration of the weld metal into the members surrounding the weld hole 32 during electroslag welding varies depending on the dimensions of the members surrounding the weld hole 32. Therefore, in this embodiment, the heat input of calculation example No. 1 was assumed to be 300 kJ/cm as a calculation standard. The calculation of the amount of heat input of calculation examples No. 2 to 5 was performed based on the cross-sectional area of the weld hole 32 of calculation examples No. 2 to 5 relative to calculation example No. 1, the plate thickness t _c of the skin plate 11 of the box section column 1, the protruding width h _d of the outer diaphragm 3, and the plate thickness t _d . The calculation results are also shown in Table 1.

As can be seen from calculation examples No. 1 to 5 in Table 1, when the plate thickness _td of the outer diaphragm 3 is small, the heat input of electroslag welding is kept small, and a significant decrease in the toughness of the welded portion 5 is unlikely to occur. In contrast, as the plate thickness _td of the outer diaphragm 3 increases, the heat input of electroslag welding also increases, making it more likely that a significant decrease in the toughness of the welded portion 5 will occur.

Next, calculation examples No. 3A to 5A based on the joint structure of the box column and the H-shaped steel beam of the second embodiment shown in Figures 4 and 5 were set up to calculate the heat input of electroslag welding. Table 2 shows the outer diameter _Dc of the box column 1 and the plate thickness _tc of the skin plate, the protruding width _hd and plate thickness _td of the outer diaphragm 3, and the root spacing G and widths _w1 and _w2 of the welding holes 34 and 35 in calculation examples No. 3A to 5A. Calculation examples No. 3A to 5A are respectively obtained by providing a partition wall 33 inside the welding hole 32 of calculation examples No. 3 to 5 shown in Table 1, and dividing the welding hole 32 into two welding holes 34 and 35 in the plate thickness direction of the outer diaphragm 3. The thickness B of the partition wall 33 in calculation example No. 3A was set to 15 mm, and the widths _w1 and _w2 of the welding holes 34 and 35 were set to 22.5 mm, respectively. In calculation example No. 4A, the thickness B of the partition wall 33 was set to 15 mm, and the widths _w1 and _w2 of the welding holes 34 and 35 were set to 32.5 mm. In calculation example No. 5A, the thickness B of the partition wall 33 was set to 20 mm, and the widths _w1 and _w2 of the welding holes 34 and 35 were set to 40 mm.

Then, the heat input due to electroslag welding was calculated for calculation examples 3A to 5A using the same method as calculation examples 1 to 5. The calculation results are also shown in Table 2.

As can be seen from calculation examples No. 3A to 5A in Table 2, by dividing the electroslag welding hole into two welding holes 34, 35 by partition 33 and applying electroslag welding to each of the welding holes 34, 35, the heat input is reduced to the same level as calculation examples No. 1 and 2 in Table 1. In other words, it was confirmed that by dividing the electroslag welding hole into two welding holes 34, 35 by partition 33 and applying electroslag welding to each of the welding holes 34, 35, a significant decrease in the toughness of the welded portion 5 can be suppressed.

1 Box section column 11 Skin plate 2 H-shaped steel beam 21 Flange 22 Web 3, 3A to 3C External diaphragm 31 Backing plate 32, 34, 35 Welding hole 33 Bulkhead w ₀ to w ₂ Width of welding hole 5 Welded part D _c Outer diameter of box section column t _c Thickness of skin plate t _d Thickness of external diaphragm h _d Projection width of external diaphragm G Root spacing B Thickness of bulkhead 81 Box section column 811 Skin plate 82 H-shaped steel beam 821 Flange 83 External diaphragm 83h Projection width of external diaphragm 84 Internal diaphragm 84G Root spacing 841 Backing plate 842 Welding hole 85 Through diaphragm 86 to 89 Welded part

Claims (6)

A joint structure between a box-shaped column and an H-shaped steel beam, in which an H-shaped steel beam is joined to a welded assembled box-shaped column formed by joining four skin plates to each other by corner welding via an external diaphragm,
A joining structure between a box section column and an H-shaped steel beam, in which a welding hole surrounded by a metal is provided between the surface of the skin plate and the end face of the outer diaphragm, and the box section column and the outer diaphragm are joined by a weld formed by filling the welding hole with molten metal by electroslag welding. The joining structure of a box section column and an H-shaped steel beam according to claim 1, in which a partition wall made of a steel piece is provided inside the welding hole so that the welding hole is divided into two or more holes in the thickness direction of the outer diaphragm. The joint structure between a box section column and an H-shaped steel beam according to claim 1 or 2, wherein the yield strength of the outer diaphragm is greater than the yield strength of the flange of the H-shaped steel beam. A manufacturing method for a joint structure between a box column and an H-shaped steel beam, the method comprising: joining an H-shaped steel beam to a welded assembled box column formed by joining four skin plates to each other by corner welding via an external diaphragm,
A manufacturing method for a joining structure of a box section column and an H-shaped steel beam, comprising: providing a welding hole by surrounding the area between the surface of the skin plate and the end face of the outer diaphragm with a metal strip; filling the welding hole with molten metal by electroslag welding with a heat input of 100 to 1500 kJ/cm to form a weld, thereby joining the box section column and the outer diaphragm. The method for manufacturing a joint structure between a box section column and an H-shaped steel beam according to claim 4, in which a partition wall made of a steel piece is provided inside the welding hole so that the welding hole is divided into two or more holes in the thickness direction of the outer diaphragm. The method for manufacturing a joint structure between a box section column and an H-shaped steel beam according to claim 4 or 5, wherein the yield strength of the outer diaphragm is greater than the yield strength of the flange of the H-shaped steel beam.

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