Column-beam joint structure

Abstract

To provide a column-beam joint structure with a joint structure that is installed between upper and lower diaphragms and in which a steel beam joined to at least one of right and left sides is joined as an eccentric beam which is eccentrically positioned forward to a position where a beam core does not intersect with a square steel pipe column in plan view, the column-beam joint structure exhibiting required performance as a joint that the eccentric beam is joined eccentrically forward.SOLUTION: A joint structure 50 integrated by welding a pair of right and left extending steel plate parts 51A, 51B overlapping with a pair of right and left column plates 10a, 10b of a square steel pipe 10 in plan view respectively, and extending forward so that eccentric beams 20A, 20B are joined, a front and rear pair of column front and rear steel plate parts 53A, 53B provided across an area between the pair of right and left extending steel plate parts 51A, 51B and overlapping with a front and rear pair of column plates 10c, 10d of the square steel pipe 10 respectively, and a beam side steel plate part 55 provided across an area between the pair of extending steel plate parts 51A, 51B in a position parallel to the pair of column front and rear steel plate parts 53A, 53B and passing through a beam core 20a.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a column-beam joint structure including a joint structure body having an eccentric beam in which a steel beam interposed between upper and lower diaphragms provided on a rectangular steel pipe column and joined to at least one of the left and right sides is joined in a state where the beam core is eccentric forward to a position where it does not intersect the rectangular steel pipe column in plan view.

Background Art

[0002] A column-beam joint structure including a joint structure body having an eccentric beam in which a steel beam interposed between upper and lower diaphragms provided on a rectangular steel pipe column and joined to at least one of the left and right sides is joined in a state where the beam core is eccentric forward to a position where it does not intersect the rectangular steel pipe column in plan view is known (see, for example, Patent Document 1). In the column-beam joint structure described in Patent Document 1, the joint structure body is integrally formed by welding a rectangular steel pipe portion overlapping the rectangular steel pipe column in plan view, a pair of left and right reinforcing steel plate portions welded to the outer peripheral surface of the rectangular steel pipe portion and extending forward to which at least one eccentric beam is joined, and a connecting steel plate portion provided between the pair of left and right reinforcing steel plate portions and located forward of the rectangular steel pipe column. That is, in the column-beam joint structure described in Patent Document 1, when constructing the joint structure body, a pair of left and right reinforcing steel plate portions extending forward for connecting the eccentric beam are welded to the outer peripheral surface of the rectangular steel pipe portion concentric with the upper and lower rectangular steel pipe columns. For example, with the rear side portions of the pair of left and right reinforcing steel plate portions along the left and right side surfaces of the rectangular steel pipe portion, the peripheral edges of the rear side portions of the reinforcing steel plate portions are joined to the side surfaces of the rectangular steel pipe portion by fillet welding.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the column-beam joint structure of Patent Document 1 mentioned above, since a pair of left and right steel frame beams are connected, a pair of left and right reinforcing steel plate portions extending forward are welded and joined to the outer peripheral surface of a square steel pipe portion that is concentric with the upper and lower square steel pipe columns. As a result, the structure becomes complicated, and there are restrictions on the welding locations and welding methods between the square steel pipe portion and the reinforcing steel plate portion. Therefore, there are cases where the required performance necessary for a joint in which the left and right steel frame beams are joined eccentrically forward cannot be exhibited. In view of this actual situation, the main problem of the present invention is to provide a column-beam joint structure provided with a joint structure body in which a steel frame beam interposed between upper and lower diaphragms provided in a square steel pipe column and joined to at least one of the left and right sides is an eccentric beam joined in a state where the beam core is eccentric forward to a position where it does not intersect the square steel pipe column in a plan view. The point is to provide a technique for exhibiting the required performance necessary for a joint in which the eccentric beam is joined eccentrically forward while adopting a simple and reasonable configuration.

Means for Solving the Problems

[0005] A first characteristic configuration of the present invention is a column-beam joint structure provided with a joint structure body in which a steel frame beam interposed between upper and lower diaphragms provided in a square steel pipe column and joined to at least one of the left and right sides is an eccentric beam joined in a state where the beam core is eccentric forward to a position where it does not intersect the square steel pipe column in a plan view, wherein the joint structure body is integrally formed by welding and joining a pair of left and right extending steel plate portions that overlap each of the pair of left and right column plates of the square steel pipe column in a plan view, extend forward, and to which at least one of the eccentric beams is joined, a pair of front and rear column front and rear side steel plate portions provided across the pair of left and right extending steel plate portions and overlapping each of the pair of front and rear column plates of the square steel pipe column, and a beam side steel plate portion provided across the pair of left and right extending steel plate portions in a posture parallel to the pair of front and rear column front and rear side steel plate portions and passing through the beam core of the eccentric beam.

[0006] According to this configuration, the joint structure integrally combines a pair of left and right extending steel plate parts, a pair of front and rear column front and rear side steel plate parts, and a beam side steel plate part by welding, and is configured in a box shape like the Chinese character 'Ri' in plan view. The rear side portions of each of the pair of left and right extending steel plate parts and the pair of front and rear column front and rear side steel plate parts provided therebetween are used as square steel pipe column portions overlapping the upper and lower square steel pipe columns. The front side portions of each of the pair of left and right extending steel plate parts and the beam side steel plate part provided therebetween and passing through the beam core of the eccentric beam are used as an eccentric beam joint portion where a steel frame beam joined to at least one of the left and right sides is joined to the eccentric beam in a state of being eccentric forward. And in the joint structure configured in this way, the pair of left and right steel plate parts overlapping each of the pair of left and right column plates of the square steel pipe column in plan view in the square steel pipe column portion and the pair of left and right steel plate parts to which the eccentric beam is joined to at least one in the eccentric beam joint portion are not welded to each other, but are composed of the rear side portion and the front side portion of the same pair of left and right extending steel plate parts. By this, while realizing a simple and reasonable configuration that suppresses restrictions on welding locations and welding methods, it is possible to exhibit the rigidity required for joining the eccentric beam with an eccentricity forward. Therefore, according to the present invention, in a column-beam joint structure including a joint structure in which a steel frame beam interposed between upper and lower diaphragms provided in a square steel pipe column and joined to at least one of the left and right sides is an eccentric beam joined in a state of being eccentric forward to a position where the beam core does not intersect the square steel pipe column in plan view, it is possible to provide a technique for exhibiting the required performance as a joint where the eccentric beam is joined with an eccentricity forward while adopting a simple and reasonable configuration.

[0007] The second characteristic configuration of the present invention lies in that the plate thicknesses of the pair of left and right extending steel plate parts and the beam side steel plate part constituting the joint structure are larger than the plate thicknesses of the respective column plates of the square steel pipe column.

[0008] According to this configuration, in the joint structure, a pair of left and right extending steel plate portions that overlap with each of the left and right column plates of the square steel pipe column in plan view and extend forward and to which at least one eccentric beam is joined, and a beam-side steel plate portion that is provided between the pair of left and right extending steel plate portions and through which the beam core of the eccentric beam passes has a plate thickness larger than the plate thickness of each column plate of the square steel pipe column. Therefore, the rigidity of the joint structure can be further improved, and the required performance necessary for the joint where the eccentric beam is eccentrically joined forward can be more surely exhibited.

[0009] A third characteristic configuration of the present invention is that a front-side steel frame beam different from the eccentric beam is joined to the front side of the joint structure, and the web of the front-side steel frame beam is welded and joined to the beam-side steel plate portion.

[0010] According to this configuration, in the joint structure, the beam-side steel plate portion is provided in front of the column front-side steel plate portion that overlaps with the front-side column plate located on the front side of the pair of front and rear column plates of the square steel pipe column in plan view. Therefore, simply by welding and joining the web of the front-side steel frame beam different from the eccentric beam to the beam-side steel plate portion, a stress transmission path from the front-side steel frame beam to the square steel pipe column through the joint structure can be preferably ensured.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0012] Embodiments of the present invention will be described with reference to the drawings. Figures 1, 2, and 3 show the column-beam joint structure of this embodiment (hereinafter referred to as "this joint structure"). In each figure, the hatched part represents the welded joint part, and there may be a welded joint part even outside the hatched part. This joint structure is a column-beam joint structure provided with a joint structure body 50 between upper and lower diaphragms 15A and 15B provided on a square steel pipe column 10. And in this joint structure body 50, each of a pair of left and right steel frame beams is joined as eccentric beams 20A and 20B in a state where the beam cores 20a are eccentric forward to a position where they do not intersect the square steel pipe column 10 in plan view (see Fig. 2). In this embodiment, the upper and lower diaphragms 15A and 15B are configured as through diaphragms, but they may be configured as diaphragms of another form such as outer diaphragms.

[0013] In this application, regarding the front-rear directions Y1 and Y2, the direction along the eccentric direction of the beam cores 20a of the eccentric beams 20A and 20B as viewed from the column core of the square steel pipe column 10 is called the front Y1, and the opposite direction is called the rear Y2. Also, regarding the left-right directions X1 and X2, as viewed from the joint structure body 50, the direction in which the left eccentric beam 20A of the pair of eccentric beams 20A and 20B extends is called the left side X1, and the direction in which the right eccentric beam 20B of the pair of eccentric beams 20A and 20B extends is called the right side X2. Also, regarding the up-down directions Z1 and Z2, as viewed from the joint structure body 50, the direction toward the upper diaphragm 15A is called the upper Z1, and the direction toward the lower diaphragm 15B is called the lower Z2.

[0014] Regarding the eccentricity widths of the left eccentric beam 20A and the right eccentric beam 20B, it is only necessary that each of these eccentric beams 20A and 20B is eccentric to a position where the beam core 20a does not intersect the square steel pipe column 10 in plan view. However, in this embodiment, as shown in FIG. 2, the rear Y2-side surfaces 20b of these eccentric beams 20A and 20B are arranged along the front Y1-side front column plate 10c of the square steel pipe column 10. Incidentally, as shown in FIG. 4, the rear Y2-side surfaces 20b of these eccentric beams 20A and 20B may be located on the front Y1-side of the front column plate 10c of the square steel pipe column 10. Further, as shown in FIG. 5, the rear Y2-side surfaces 20b of these eccentric beams 20A and 20B may be located on the rear Y2-side of the front column plate 10c of the square steel pipe column 10.

[0015] This joint structure is configured to exhibit the required performance necessary for a joint where the left eccentric beam 20A and the right eccentric beam 20B are eccentrically joined to the front Y1 while adopting a simple and reasonable configuration, and the details thereof will be described below. The joint structure body 50 is configured by arranging a plurality of steel plate portions 51A, 51B, 53A, 53B, 55 in a vertical posture along a substantially vertical plane extending between the upper diaphragm 15A and the lower diaphragm 15B in a "day"-shaped box shape in plan view (see FIG. 2), and integrating them by full penetration welding. When joining the eccentric beams 20A, 20B, 30, 35 to this joint structure, the ends of the upper and lower flanges 20Aa, 20Ba, 30a, 35a of these eccentric beams 20A, 20B, 30, 35 are welded and joined to the respective ends of the upper diaphragm 15A and the lower diaphragm 15B in a horizontal posture, and the ends of the webs 20Ab, 20Bb, 30b, 35b of these eccentric beams 20A, 20B, 30, 35 are welded and joined to any outer surface of the plurality of steel plate portions 51A, 51B, 53B, 55 in the above vertical posture.

[0016] In the joint structure 50, as the plurality of steel plate parts 51A, 51B, 53A, 53B, 55, there are arranged a pair of extended steel plate parts 51A, 51B respectively arranged on the left side X1 side and the right side X2 side, a pair of column front and rear side steel plate parts 53A, 53B respectively arranged on the front side Y1 side and the rear side Y2 side, and a beam side steel plate part 55 arranged on the front side Y1 side thereof. The pair of extended steel plate parts 51A, 51B are composed of a left extended steel plate part 51A and a right extended steel plate part 51B which overlap with the left column plate 10a and the right column plate 10b of the square steel pipe column 10 in plan view (see FIG. 2) and extend to the front side Y1 side, and the left eccentric beam 20A and the right eccentric beam 20B are respectively joined thereto. That is, in the joint structure 50, the rear side parts 51Ab, 51Bb which are the rear side Y2 side parts of the left extended steel plate part 51A and the right extended steel plate part 51B respectively constitute a square steel pipe column part that overlaps with the left column plate 10a and the right column plate 10b of the square steel pipe column 10 in plan view (see FIG. 2). On the other hand, the front side parts 51Aa, 51Ba which are the front side Y1 side parts of the left extended steel plate part 51A and the right extended steel plate part 51B respectively constitute an eccentric beam joint part where the ends of the webs 20Ab, 20Bb of the left eccentric beam 20A and the right eccentric beam 20B are welded and joined. Incidentally, the plate thicknesses of these pair of extended steel plate parts 51A, 51B are made larger than the plate thicknesses of the respective column plates 10a, 10b, 10c, 10d of the square steel pipe column 10 in order to improve the rigidity of the joint structure 50.

[0017] The pair of column front and rear side steel plate parts 53A, 53B are provided across between the left extended steel plate part 51A and the right extended steel plate part 51B and are composed of a column front side steel plate part 53A and a column rear side steel plate part 53B which overlap with the front column plate 10c and the rear column plate 10d of the square steel pipe column 10 respectively. That is, in the joint structure 50, the column front side steel plate part 53A and the column rear side steel plate part 53B constitute a square steel pipe column part that overlaps with the front column plate 10c and the rear column plate 10d of the square steel pipe column 10 in plan view (see FIG. 2). Incidentally, the plate thicknesses of these pair of column front and rear side steel plate parts 53A, 53B are made the same as the plate thicknesses of the front column plate 10c and the rear column plate 10d of the square steel pipe column 10 that overlap in plan view (see FIG. 2).

[0018] The steel plate portion 55 on the beam side is provided between the left extended steel plate portion 51A and the right extended steel plate portion 51B in a posture parallel to the front side column plate 10c and the rear side column plate 10d, and is a single steel plate portion passing through the beam core 20a along the webs 20Ab, 20Bb of the left eccentric beam 20A and the right eccentric beam 20B. That is, in the joint structure 50, the steel plate portion 55 on the beam side constitutes an eccentric beam joint portion where the left eccentric beam 20A and the right eccentric beam 20B are joined in a state where each is eccentric forward in the Y1 direction. Incidentally, the plate thickness of this steel plate portion 55 on the beam side is made larger than the plate thicknesses of the respective column plates 10a, 10b, 10c, 10d of the square steel pipe column 10 in order to improve the rigidity of the joint structure 50.

[0019] And with respect to the upper diaphragm 15A and the lower diaphragm 15B arranged in parallel to each other in a horizontal posture, the upper and lower end portions of each of the plurality of steel plate portions 51A, 51B, 53A, 53B, 55 in a vertical posture are joined by full penetration welding. Further, with respect to the left extended steel plate portion 51A and the right extended steel plate portion 51B arranged in parallel to each other in a vertical posture, the column front side steel plate portion 53A, the column rear side steel plate portion 53B, and the left and right end portions of the steel plate portion 55 on the beam side arranged in parallel to each other and provided therebetween are joined by full penetration welding.

[0020] With such a configuration, in the square steel pipe column portion overlapping the square steel pipe column 10 in plan view (see FIG. 2), a pair of left and right rear portions 51Ab, 51Bb overlapping the respective left and right pair of column plates 10a, 10b of the square steel pipe column 10, and a front portion 51Aa, 51Ba where the left eccentric beam 20A and the right eccentric beam 20B are directly joined in the eccentric beam joint portion where the left eccentric beam 20A and the right eccentric beam 20B are joined in an eccentric state are not composed of separate steel plate portions welded to each other, but are portions on the same left extended steel plate portion 51A and right extended steel plate portion 51B. From this, while realizing a simple and reasonable configuration that suppresses restrictions on welding locations and welding methods, the rigidity required to eccentrically join the left eccentric beam 20A and the right eccentric beam 20B forward in the Y1 direction is exhibited.

[0021] In this joint structure, as steel beams different from the above-described left eccentric beam 20A and right eccentric beam 20B, a front steel beam 30 and a rear steel beam 35 can be appropriately joined. For the front steel beam 30 joined to this joint structure, the ends of the upper and lower flanges 30a are welded to the respective ends on the front Y1 side of the upper diaphragm 15A and the lower diaphragm 15B, and the end of the web 30b is welded to the front surface of the beam-side steel plate portion 55. By this, a stress transmission path from the front steel beam 30 to the square steel pipe column 10 through the joint structure body 50 is preferably ensured. On the other hand, for the rear steel beam 35 joined to this joint structure, the ends of the upper and lower flanges 35a are welded to the respective ends on the rear Y2 side of the upper diaphragm 15A and the lower diaphragm 15B, and the end of the web 35b is welded to the rear surface of the column-rear steel plate portion 53B. By this, a stress transmission path from the rear steel beam 35 to the square steel pipe column 10 through the joint structure body 50 is preferably ensured.

[0022] In the manufacturing method of the joint structure body 50, regarding the manufacturing sequence for simply and inexpensively manufacturing the joint structure body 50 using robot welding or the like when welding and joining the respective steel plate portions 51A, 51B, 53A, 53B, 55 to each other, the following explanation is added. First, the left extended steel plate portion 51A and the right extended steel plate portion 51B are joined to the column-rear steel plate portion 53B to manufacture a semi-finished product in a U-shape in plan view. By this, in the U-shaped semi-finished product, the left extended steel plate portion 51A and the right extended steel plate portion 51B are fixed in a state where they are arranged parallel to each other in a vertical posture. Next, the upper and lower diaphragms 15A, 15B are welded and joined to the above U-shaped semi-finished product. Incidentally, the welding and joining of the upper and lower diaphragms 15A, 15B may be performed during the manufacturing process of manufacturing the above U-shaped semi-finished product. Then, after welding and joining the column front side steel plate portion 53A to the left extended steel plate portion 51A and the right extended steel plate portion 51B in these U-shaped semi-finished products and the upper and lower diaphragms 15A and 15B, the beam side steel plate portion 55 is welded and joined to the front side thereof. By doing this, the welding and joining of each of these column front side steel plate portion 53A and beam side steel plate portion 55 can be appropriately carried out without interfering with each other.

[0023] 〔Alternative Embodiment〕 Another embodiment of the present invention will be described. Note that the configurations of each of the embodiments described below are not limited to being applied alone, and can also be applied in combination with the configurations of other embodiments.

[0024] (1) In the above embodiment, the left eccentric beam 20A and the right eccentric beam 20B are joined to both the left and right sides of the joint structure 50, but one of these left eccentric beam 20A and right eccentric beam 20B may be omitted.

[0025] (2) In the above embodiment, in the joint structure 50, the plate thicknesses of each of the left extended steel plate portion 51A, the right extended steel plate portion 51B, and the beam side steel plate portion 55 are made larger than the plate thickness of the square steel pipe column 10, and the plate thicknesses of each of the column front side steel plate portion 53A and the column rear side steel plate portion 53B are made the same as the plate thickness of the square steel pipe column 10. However, the plate thicknesses of the steel plate portions 51A, 51B, 53A, 53B, and 55 constituting the joint structure 50 can be appropriately changed within the range that can satisfy the required performance necessary for the joint.

[0026] (3) In the above embodiment, the steel frame beams 30 and 35 different from the left eccentric beam 20A and the right eccentric beam 20B are joined to this joint structure, but these different steel frame beams 30 and 35 can be appropriately omitted.

Explanation of Reference Numerals

[0027] 10 Square steel pipe column 10a Left column plate 10b Right column plate 10c Front column plate 10d Rear column plate 15A Upper diaphragm 15B Lower diaphragm 20A Left eccentric beam 20B Right eccentric beam 20a Beam core 30 Front side steel frame beam 30b Web 50 Joint structure 51A Left extended steel plate part 51Aa Front side part 51Ab Rear side part 51B Right extended steel plate part 51Ba Front side part 51Bb Rear side part 53A Column front side steel plate part 53B Column rear side steel plate part 55 Beam side steel plate part X1 Left side X2 Right side Y1 Front Y2 Rear Z1 Upper Z2 Lower

Claims

1. A column-beam connection structure including a connection structure body with an eccentric beam, wherein the steel frame beam interposed between the upper and lower diaphragms provided on the square steel pipe column and joined to at least one of the left and right sides is joined in a state where the beam center is eccentric forward to a position where it does not intersect the square steel pipe column in plan view. The connection structure body includes a pair of left and right extending steel plate portions that overlap each of the pair of left and right column plates of the square steel pipe column in plan view, extend forward, and to which the eccentric beam is joined to at least one of them; a pair of front and rear column front and rear side steel plate portions provided across the pair of left and right extending steel plate portions and overlapping each of the pair of front and rear column plates of the square steel pipe column; and a beam side steel plate portion provided across the pair of left and right extending steel plate portions in a posture parallel to the pair of front and rear column front and rear side steel plate portions and passing through the beam center of the eccentric beam, and is integrally formed by welding.

2. The column-beam connection structure according to Claim 1, wherein the plate thicknesses of the pair of left and right extending steel plate portions and the beam side steel plate portion constituting the connection structure body are larger than the plate thicknesses of the respective column plates of the square steel pipe column.

3. The column-beam connection structure according to Claim 1 or 2, wherein a front side steel frame beam different from the eccentric beam is joined to the front side of the connection structure body, and the web of the front side steel frame beam is welded to the beam side steel plate portion.

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