JP2018084139A - Column-beam joining structure of square steel pipe column and h-shaped steel beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a column-beam joining structure excellent in manufacturing processability and site workability, as the column-beam joining structure using an outer diaphragm form of a square steel pipe column and an H-shaped steel beam.SOLUTION: A column-beam joining structure 10 is a column-beam joining structure of a square steel pipe column 1 and an H-shaped steel beam 2, and four L-shaped steel pieces 12 are welded-joined to the square steel pipe column 1 in a state of butting against a short side end part of an L-shaped steel piece 12 positioned in the next to a long side end part of the respective L-shaped steel pieces 12, so that a split type outer diaphragm 11 is formed, and the square steel pipe column 1 and the H-shaped steel beam 2 are welded-joined via its split type outer diaphragm 11.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a beam-to-column connection structure between a square steel pipe column and an H-shaped steel beam, which is mainly used in the construction field.

  In a building steel structure, in a column beam connection structure using a square steel pipe column and an H-shaped steel beam, a joining element called a diaphragm is generally used to supplement the strength of the column beam connection portion. For example, various forms shown in Non-Patent Document 1 are adopted, and the form is shown in FIG. 9 as a column beam joint between the square steel pipe column 1 and the H-shaped steel beam 2 as illustrated in FIG. The type using the outer diaphragm 21 shown in a) (outer diaphragm type), the type using the through diaphragm 22 shown in FIG. 9B (through diaphragm type), and the inner diaphragm 23 shown in FIG. 9C. It is roughly divided into types (inner diaphragm format).

  Among them, the inner diaphragm type is generally joined by electroslag welding, and a very large heat input of about several hundred thousand to several million J / cm acts on the welded part. In steel materials, the toughness at the welded portion is very small, and brittle fracture is likely to occur at the welded portion. This tendency is particularly remarkable in high-strength steel materials. Further, in cold roll-formed square steel pipes and circular steel pipes, electroslag welding cannot be applied due to its shape, so that it is generally difficult to apply the type using the inner diaphragm 23.

  Further, in the through-diaphragm type, the rectangular steel pipe column 1 is cut once through the arrangement position of the diaphragm 22, and the diaphragm 22 is welded to the square steel pipe column 1 at the cut position, and then the divided rectangular steel pipe column 1 is assembled again. As a result, the amount of welding is large, and there are difficulties in ensuring accuracy such as misalignment.

  On the other hand, in the outer diaphragm type, fillet welding can be applied to welding with the square steel pipe column 1, so there is no need to worry about deterioration of toughness of the weld due to large heat input. Is also easy to apply. Further, the type using the outer diaphragm 21 has advantages such as less welding amount and processing amount than the type using the through diaphragm 22 and excellent workability when filling the square steel pipe column 1 with concrete. is there.

  However, in the case of the outer diaphragm type, when the outer diaphragm 21 is welded and joined to the square steel pipe column 1 in advance at the steel frame manufacturing factory, the size of the outer diaphragm 21 is kept as small as possible in consideration of the transport efficiency from the factory to the construction site. It is desirable.

  From this viewpoint, Patent Document 1 proposes an outer diaphragm type having a small size.

JP 2011-94406 A

Architectural Institute of Japan: Steel Structure Joint Design Guidelines Chapter 4 Beam-Column Joint, 2006.3

  However, Patent Document 1 proposes to use a dodecagonal outer diaphragm for the purpose of alleviating strain concentration at the beginning and end of the welded portion of the H-shaped steel beam 2, and in this case, the diaphragm is used. There are many problems such as a large number of processing man-hours, a large material loss at the time of manufacturing, and a restriction on the shape of the diaphragm due to the width of the beam to be joined.

  The present invention has been made in view of the circumstances as described above, and is a column beam excellent in manufacturing workability and on-site workability as a column beam connection structure in the form of an outer diaphragm between a square steel pipe column and an H-shaped steel beam. The object is to provide a joint structure.

  In order to solve the above problems, the present invention has the following features.

  [1] A column beam connection structure of a square steel pipe column and an H-shaped steel beam, in which four L-shaped steel pieces are end portions of L-shaped steel pieces that are adjacent to each other. The outer diaphragm is formed by being welded to the rectangular steel pipe column in a state of being butted, and the rectangular steel pipe column and the H-shaped steel beam are bonded via the outer diaphragm. Column beam connection structure of a square steel pipe column and an H-shaped steel beam.

  [2] The above-mentioned aspect, wherein the end of each L-shaped steel slab is in contact with the end of the L-shaped steel slab adjacent to the end of the L-shaped steel slab is located within the flange width of the H-shaped steel beam. A column beam joint structure of the square steel pipe column and the H-shaped steel beam according to [1].

  [3] The beam-column joining structure of a rectangular steel pipe column and an H-shaped steel beam according to [2], wherein the butted portion is not joined.

  [4] The square steel pipe column and the H-shape according to any one of [1] to [3], wherein the L-shaped slab is manufactured by slicing an angle steel produced by rolling. Column beam connection structure with steel beam.

  In the present invention, a column beam connection structure excellent in manufacturing workability and on-site workability can be provided as a column beam connection structure by an outer diaphragm type between a square steel pipe column and an H-shaped steel beam.

It is a perspective view which shows the column beam junction structure which concerns on one Embodiment of this invention. It is a top view which shows the column beam junction structure which concerns on one Embodiment of this invention. It is a top view which shows the column beam junction structure which concerns on other embodiment of this invention. It is a figure for showing the example of a dimension of the L-shaped steel piece used by one embodiment of the present invention. It is a figure which shows the example of a manufacturing method of the L-shaped steel piece used by one Embodiment of this invention. It is a figure which shows the analytical model of the beam-column joining structure in the Example of this invention. It is a figure which shows the example of this invention and the comparative example in the Example of this invention. It is a figure which shows the analysis result in the Example of this invention. It is a figure which shows a prior art.

  An embodiment of the present invention will be described with reference to the drawings.

  1 and 2 show a column beam connection structure according to an embodiment of the present invention. FIG. 1 is a perspective view and FIG. 2 is a top view.

  As shown in FIGS. 1 and 2, a column beam connection structure 10 according to an embodiment of the present invention is a column beam connection structure of a square steel pipe column 1 and an H-shaped steel beam 2 (flange 2a, web 2b). The four L-shaped steel pieces 12 are in a state in which the end on the long side of each L-shaped steel piece 12 is abutted with the end on the short side of the L-shaped steel piece 12 located next to each other, A split outer diaphragm 11 is formed by joining the square steel pipe column 1 by fillet welding or partial penetration welding, and the square steel pipe column 1 and the H-shaped steel beam 2 are connected via the split outer diaphragm 11. It is welded.

  Here, the portion (butting portion) 13 where the long-side end of each L-shaped steel piece 12 is abutted with the short-side end of the L-shaped steel piece 12 adjacent to the L-shaped steel piece 12 is completely penetration welded. It is joined with.

  By using such a split outer diaphragm 11 in which four L-shaped steel pieces 12 are combined, a column beam connection structure excellent in manufacturing workability and on-site workability is obtained.

  That is, when constructing a conventional integrated outer diaphragm 21 on-site, it is necessary to move from the upper end of the square steel pipe column 1 to a predetermined position through the integrated outer diaphragm 21, which is very troublesome in the field construction. Further, when the integrated outer diaphragm 21 is manufactured from a steel plate, it is necessary to cut a portion corresponding to the central portion of the integrated outer diaphragm 21 to make a space, and there are many material losses.

  On the other hand, when constructing the split outer diaphragm 11 according to this embodiment on-site, it is not necessary to move the split outer diaphragm 11 to the predetermined position through the upper end of the square steel pipe column 1 and the split outer outer diaphragm 11 is moved to the predetermined position. Since the diaphragm 11 can be directly welded and joined, on-site construction is very easy. Further, when the split outer diaphragm 11 is manufactured and processed from a steel plate, the L-shaped steel pieces 12 may be sequentially cut out from the steel plate, so that there is little material loss.

  In the split outer diaphragm 11, the butted portion (welded portion) 13 is preferably located within the width of the flange 2 a of the H-shaped steel beam 2.

  If the butted portion (welded portion) 13 is located outside the width of the flange 2a of the H-shaped steel beam 2, when a tensile force acts on the split outer diaphragm 11 from the H-shaped steel beam 2 during an earthquake, This is because stress and strain are likely to concentrate near the butted portion (welded portion) 13 and there is a risk of breaking earlier than the vicinity of the weld heat affected zone where strength and toughness have deteriorated.

  In other words, when the butt portion (welded portion) 13 is positioned within the width of the flange 2a of the H-shaped steel beam 2, stress and strain are present in the vicinity of the butt portion (welded portion) 13. It is possible to reduce the risk of brittle fracture from the butted portion (welded portion) 13 without concentrating.

  Therefore, depending on the case, the butt | matching part 13 does not need to be joined and can save time, such as welding.

  And it is preferable that the four L-shaped steel pieces 12 are the same size and shape. As a result, the square split outer diaphragm 11 can be formed, and the butted portion 13 can be easily positioned within the width of the flange 2a of the H-shaped steel beam 2. Moreover, the manufacturing process and management of the L-shaped steel piece 12 are also facilitated.

  In addition, as shown in FIG. 3, the two sides of the L-shaped steel piece 12 constituting the split outer diaphragm 11 may be equal.

  Here, the typical example of a dimension of the L-shaped steel piece 12 which comprises the division | segmentation type outer diaphragm 11 is demonstrated using FIG. 4A is a top view and FIG. 4B is a side view.

  That is, typical dimensions of the L-shaped steel piece 12 are as follows.

Long side length A = 500-700mm
Short side length B = 500mm
Width C = 40-60mm
Thickness D = 40-60mm

  And the example of the manufacturing method of the L-shaped steel piece 12 is demonstrated using FIG.

  First, FIG. 5A shows a case where the L-shaped steel piece 12 is manufactured from the steel plate 31. As described above, the L-shaped steel pieces 12 may be sequentially cut from the steel plate 31 side by side, so that the material loss can be reduced.

  FIG. 5B shows a case where the L-shaped steel piece 12 is manufactured from the rolled angle steel 32. Since it is sufficient to slice the angle steel 32 sequentially, there is almost no material loss.

  As described above, the beam-column joining structure 10 according to this embodiment is a beam-column joining structure excellent in manufacturing processability and field workability.

  As an example of the present invention, FEM analysis was performed in order to verify the effect of the column beam connection structure according to the present invention.

  As shown in the top view in FIG. 6 (a) and the perspective view in FIGS. 6 (b) and 6 (c), the analysis model is formed on a “U” -shaped member assuming a square steel pipe column 1 via an outer diaphragm. The beam flange 2a is joined. Note that reference numeral 3 in FIG. 6 denotes an imaginary grip portion connected to a “U” -shaped member (square steel pipe column) 1.

  At that time, as an example of the present invention, the beam-column joint structure 10 according to the above-described embodiment of the present invention was used. That is, as shown in FIG. 7 (a), a split outer diaphragm 11 formed of an L-shaped steel piece 12 is employed as the outer diaphragm. The split outer diaphragm 11 was a metal touch without joining the butted portion 13 of the L-shaped steel piece 12.

  On the other hand, for comparison, as a comparative example, as shown in FIG. 7B, as an outer diaphragm, as shown in FIG. 21 was used.

And the tensile force was made to act on the beam flange 2a and the holding material 3, the displacement between A point and B point in FIG. 6 was output, and the load-displacement relationship was confirmed. The square steel pipe column 1 was assumed to be 780 N / mm ^second grade steel, and the outer diaphragms 11 and 21 were assumed to be 550 N / mm ^second grade steel, and corresponding stress-strain characteristics were given. The beam flange 2a and the gripping material 3 were modeled as elastic bodies. Table 1 shows a list of analysis cases (Invention Examples 1 to 5, Comparative Examples 1 to 5).

  FIG. 8 shows an analysis case in which the dimensions of each part are the same in the inventive example and the comparative example (the inventive example 1 and the comparative example 1, the inventive example 2 and the comparative example 2,..., The inventive example 5 and the comparative example 5). ) For comparing the load-displacement relationship between the two.

  As shown in FIGS. 8A to 8E, in any case, the load-displacement relationship of the present invention example and the comparative example is almost the same, which proves that the present invention is effective.

DESCRIPTION OF SYMBOLS 1 Square steel pipe column 2 H-shaped steel beam 2a Flange of H-shaped steel beam 2b Web of H-shaped steel beam 3 Grab material 10 Column beam connection structure 11 Split-type outer diaphragm 12 L-shaped steel piece 13 Butting part 21 Outer diaphragm 22 Through Diaphragm 23 Inner diaphragm 31 Steel plate 32 Angle steel

Claims (4)

  This is a beam-to-column connection structure between a square steel pipe column and an H-shaped steel beam, and four L-shaped steel pieces abut against the ends of the L-shaped steel pieces where the ends of each L-shaped steel piece are located next to each other. In this state, the outer diaphragm is formed by being welded to the square steel pipe column, and the square steel pipe column and the H-shaped steel beam are welded to each other via the outer diaphragm. Column beam connection structure of square steel pipe column and H-shaped steel beam.   2. The butted portion, which is abutted with the end of the L-shaped steel slab adjacent to the end of each L-shaped steel slab, is located within the flange width of the H-shaped steel beam. Column beam connection structure of the described square steel pipe column and H-shaped steel beam.   The said butt | matching part is not joined, The column beam joining structure of the square steel pipe column and H-shaped steel beam of Claim 2 characterized by the above-mentioned.   4. The beam-to-column connection structure between a rectangular steel pipe column and an H-shaped steel beam according to claim 1, wherein a thickness of the L-shaped steel slab is greater than a thickness of a flange of the H-shaped steel beam. .

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