JP2020020167A - Beam-to-column connection structure - Google Patents

Abstract

To provide a beam-to-column connection structure efficiently utilizing thickness of four sides of a rectangular steel tube column while avoiding a large increase in steel frame volume, and appropriately handling stress from the beam which is joined relatively largely eccentrically to the column.SOLUTION: In a beam-to-column connection structure in which the beam 2 is eccentrically joined in the width direction with respect to a core portion 10 of the column 1 composed of a pair of upper and lower diaphragms 11 and a rectangular steel pipe column portion 12 between the pair of upper and lower diaphragms 11, a plate thickness of two surfaces 12b adjacent to an eccentric surface 12a is set to be larger than the plate thickness of the eccentric surface 12a, in the rectangular steel pipe column portion 12.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a beam-column connection structure in which a column and a beam are joined, and more specifically, to a beam core structure of a column including a pair of upper and lower diaphragms and a rectangular steel tube column between the pair of upper and lower diaphragms. The present invention relates to a beam-to-column connection structure to which are joined.

In order to increase the effective area of a guest room by reducing a vertical pipe space in a hotel or the like, there is a case where a steel beam is eccentrically joined to a core portion of a column in a beam-column connection structure. In this case, large-scale reinforcement is required in order to prevent damage due to stress concentration at the eccentric side joint portion of the rectangular steel tube column portion of the core portion.
In Patent Document 1, in order to eliminate the need for such a large-scale reinforcement, the plate thickness of the eccentric side (that is, the connection panel to which the beam is attached) in the rectangular steel tube column portion of the core portion is changed to the other three surfaces. The thickness is set to be larger than the thickness, and the stress is intensively processed on the eccentric surface having the large thickness.

JP-A-08-13691

  In the technology described in Patent Document 1, the thickness of the eccentric side surface must be set to a very large thickness capable of intensively treating the stress from the beam, and as a result, the amount of steel frames increases significantly. Can be considered.

  The present invention has been made in view of the above situation, and its main problem is to effectively utilize the thickness of the four sides of the rectangular steel pipe column while avoiding a large increase in the amount of steel frame. Another object of the present invention is to provide a beam-column connection structure capable of appropriately treating stress from a beam which is relatively eccentrically joined to a column.

A first characteristic configuration of the present invention is a column-beam in which a beam is eccentrically joined in a width direction with respect to a core portion of a column including a pair of upper and lower diaphragms and a rectangular steel tube column between the pair of upper and lower diaphragms. The connection structure,
In the square steel pipe column portion, the plate thickness of two surfaces adjacent to the eccentric surface is set to be larger than the plate thickness of the eccentric surface.

According to this configuration, in the rectangular steel pipe column portion, by setting the plate thickness of two surfaces adjacent to the eccentric surface to be larger than the plate thickness of the eccentric surface, the stress from the eccentrically joined beam is set. Can be dispersed through the diaphragm, and as a result, the stress concentration at the joint on the eccentric side of the rectangular steel pipe column can be reduced.
In addition, the thickness of the two surfaces adjacent to the surface on the eccentric side does not need to be extremely large so that stress from the beam can be concentrated, and the degree of relaxation of stress concentration can be reduced by adjusting the thickness. In order to be able to adjust the thickness, it is sufficient to set the plate thickness in accordance with the target degree of stress relaxation, so that a large increase in the amount of steel frame can be avoided.
Therefore, while avoiding a large increase in the amount of steel frames, the thickness of the four sides of the rectangular steel tubular column is effectively used to appropriately reduce the stress from the beam that is joined relatively eccentrically to the column. Can be processed.

  A second characteristic configuration of the present invention resides in that the web of the beam made of the H-section steel and the plate portion on the eccentric side of the rectangular steel pipe column are arranged in a straight line in plan view.

  According to this configuration, the beam web made of the H-section steel and the plate portion on the eccentric side of the square steel pipe column are arranged in a straight line in plan view. Therefore, it is not necessary to provide a stress transmitting member or the like arranged in a straight line, and the stress can be efficiently processed from the beams eccentrically joined.

  A third characteristic configuration of the present invention is that, in the rectangular steel tube column portion, a plate thickness of a surface opposite to the eccentric surface is set smaller than a plate thickness of the eccentric surface.

  According to this configuration, the thickness of the plate portion farthest from the joint portion on the eccentric side of the rectangular steel tube column portion of the core portion is minimized, so that eccentricity is suppressed while suppressing an increase in the amount of steel frame as the entire core portion. The stress from the beams to be joined can be properly handled.

  A fourth characteristic configuration of the present invention is the projecting joint in which the flange of the beam made of an H-shaped steel is joined to the core portion in a state of projecting outward from an eccentric side surface of the rectangular steel tubular column portion. A point is provided, and a vertical stiffener is provided between the pair of upper and lower diaphragms at the projecting joint part.

  According to this configuration, the projecting joint portion of the core portion can be reinforced by the vertical stiffener provided between the pair of upper and lower diaphragms. Then, at the projecting joint portion of the reinforced core portion, the flange of the beam made of the H-section steel can be appropriately joined in a state of projecting outward beyond the eccentric side surface of the square steel tubular column portion.

  A fifth characteristic configuration of the present invention resides in that the core portion is configured as a separate core module from the columns and the beams.

  According to this configuration, the core module is carried into the column or beam assembling site, and is joined to the column or beam, so that the beam is eccentrically joined in the width direction with respect to the core portion of the column. The structure can be easily constructed.

Side view of beam-column connection structure 1 is a sectional view taken along line AA of FIG. Sectional view of the square steel tube column of the core Sectional drawing of the square steel tube column part of the core part in another embodiment

An embodiment of a beam-column connection structure of the present invention will be described with reference to the drawings.
This column-beam joint structure is suitably used for a steel-framed building or the like. In FIGS. 1 and 2, in a steel-frame hotel, an X-direction is applied to a core portion 10 of a column 1 made of a square steel pipe. The case where two beams 2 extending in the Y direction are joined to two beams 2 extending in the Y direction is illustrated. One side (the right side in the figure) in the X direction is the cabin J side and the other side (the left side in the figure) in the X direction is the corridor R side with respect to the two beams 2 extending in the Y direction. One side (the right side in the figure) in the X direction may be the corridor R side, and the other side (the left side in the figure) in the X direction may be the cabin J side.

In this column-beam joint structure, of the four beams 2 extending in the X direction and the Y direction, two beams 2 extending in the Y direction (hereinafter, sometimes referred to as eccentric beams EB) correspond to the columns 1. The core 10 is eccentrically joined to the corridor R in the width direction of the core 10 (in this example, the X direction perpendicular to the Y direction in which the eccentric beam EB extends in plan view).
In other words, the eccentric beam EB is positioned in the corridor R side in the X direction with respect to the center lines P11 and P12 of the column 1 in plan and side views in plan view and side view. The EB and the core 10 of the column 1 are joined.
Therefore, in the dwelling unit J, the pipe space PS can be reduced by the amount of the eccentricity of the eccentric beam EB, and the effective area in the dwelling unit J can be increased.

  Each beam 2 is made of an H-shaped steel having a pair of upper and lower flanges 2A and a web 2B connecting the flanges 2A. In the present embodiment, of the four beams 2 extending in the X direction and the Y direction, two beams 2 extending in the Y direction and a beam 2 extending to one side (the right side in the drawing) in the X direction are large beams having a large cross section. The flange 2A and the web 2B are welded to the core portion 10 and joined. The beam 2 extending to the other side in the X direction is a small beam having a smaller cross section than the other three beams 2, and its web 2 </ b> B is fixed to a gusset plate 14 provided on the core 10 with bolts and nuts 3. Are joined. For the beam 2 extending in the X direction, various known joining methods can be appropriately used.

  The core portion 10 includes a pair of upper and lower diaphragms 11 and a square steel pipe column 12 between the pair of upper and lower diaphragms 11. Each diaphragm 11 is configured by a horizontal plate member made of a steel plate having a plate thickness larger than the flange 2 </ b> A of the beam 2. Each diaphragm 11 can be suitably configured as a through-diaphragm installed inside and outside the column 1, an outer diaphragm installed only outside the column 1, and the like.

The flange 2A of the eccentric beam EB is joined to the core portion 10 in a state where the flange 2A protrudes outward beyond the eccentric side surface 12a of the rectangular steel pipe column portion 12 (that is, the connection panel to which the eccentric beam EB is attached) 12a. A joint portion 10A is provided.
The protruding joint portion 10A is configured such that the protruding allowance of the pair of upper and lower diaphragms 11 from the square steel tube column 12 is defined by the protrusion allowance from the eccentric side surface 12a of the square steel tube column 12 and the other surface of the square steel tube column 12. It is configured to be larger than the protrusion allowance of 12b and 12d. Further, between the pair of upper and lower diaphragms 11 at the protruding joint portion 10A, a plurality of vertical stiffeners 13 formed of a vertical plate member made of a steel plate are provided at intervals in the Y direction.
Therefore, the entire area and substantially the entire area of the flange 2A of the eccentric beam EB can be welded to the diaphragm 11 by butt welding, and the eccentric beam EB can be appropriately joined to the core portion 10.

  Further, in the present embodiment, as shown in FIG. 2, the web 2B of the eccentric beam EB and the plate portion 12A of the eccentric side surface 12a of the rectangular steel tube column portion 12 of the core portion 10 are formed by the eccentric beam EB in plan view. Are arranged in a straight line along the center line P12.

In this column-beam connection structure, as shown in FIGS. 2 and 3, in the square steel pipe column portion 12 of the core portion 10, the plate thickness tb of the two surfaces 12 b adjacent to the eccentric side surface 12 a is reduced. Is set to be larger than the plate thickness ta of the surface 12a (tb> ta).
Therefore, the stress from the eccentric beam EB can be dispersed through the diaphragm 11, so that the stress concentration at the joint on the eccentric side of the square steel pipe column 12 can be reduced, and the four surfaces of the square steel pipe column 12 can be reduced. The stress from the eccentric beam EB can be appropriately processed by effectively utilizing the plate thicknesses ta, tb, and td of 12a, 12b, and 12d.

  Further, in this column-beam connection structure, in the square steel tube column portion 12 of the core portion 10, the plate thickness td of the surface 12d on the side opposite to the eccentric side surface 12a is larger than the plate thickness ta of the eccentric side surface 12a. It is set small (td <ta). Therefore, it is possible to appropriately treat the stress from the eccentric beam EB while suppressing an increase in the amount of steel frame of the core portion 10 as a whole.

  The plate thickness ta of the eccentric side surface 12a of the square steel tube column portion 12 of the core portion 10 is larger than the plate thickness of the web 2B of the eccentric beam EB and the plate thickness of the column 1 formed of the square steel tube. It can be set to the same or more, and in the present embodiment, it is set to be larger than the plate thickness on the larger side. The plate thickness td of the surface 12d of the rectangular steel tube column portion 12 where the plate thickness is minimum is the larger one of the plate thickness of the web 2B of the beam 2 connected to the surface 12d and the plate thickness of the column 1. The thickness can be set to be equal to or greater than the thickness. In the present embodiment, the thickness is set to be equal to the thickness of the pillar 1 on the larger side. In addition, the square steel pipe column part 12 of the core part 10 is comprised by assembling four flat steel materials for each surface into a square.

  The core portion 10 is composed of a pair of upper and lower diaphragms 11, a rectangular steel pipe column portion 12, a plurality of vertical stiffeners 13, a gusset plate 14, and the like, which are components thereof, are previously integrated by welding or the like in a factory or the like, and the core 1 and the beam 2 are combined. Are configured as separate core modules M. Therefore, the eccentric beam EB is joined to the core 10 of the column 1 by bringing the core module M manufactured in advance to the site where the column 1 and the beam 2 are assembled and joining the core module M to the column 1 and the beam 2. The beam-column connection structure can be easily constructed.

[Another embodiment]
Another embodiment of the present invention will be described. The configuration of each embodiment described below is not limited to being applied independently, and may be applied in combination with the configuration of another embodiment.

(1) In the above-described embodiment, as shown in FIG. 3, an example is shown in which the square steel pipe column portion 12 of the core portion 10 is configured by assembling four flat steel members for each surface into a square. For example, as shown in FIG. 4, in the square steel pipe column portion 12, a U-shaped steel material such as a flat steel material forming the eccentric side surface 12a and a grooved steel material forming three surfaces other than the eccentric side surface 12a. The above two steel materials may be assembled in a square shape. In this case, the thickness tb, td of the three surfaces 12b, 12d other than the eccentric side surface 12a in the square steel pipe column portion 12 of the core portion 10 is the same as the plate thickness ta of the eccentric side surface 12a. The plate thickness may be set (tb = td> ta).

(2) In the above-described embodiment, in the square steel pipe column portion 12 of the core portion 10, the plate thickness td of the surface 12d on the side opposite to the eccentric side surface 12a is different from that of the two surfaces 12b adjacent to the eccentric side surface 12a. Although the case where it is configured to be equal to or smaller than the plate thickness tb has been described as an example, in some cases, the plate thickness td of the surface 12d on the side opposite to the eccentric side surface 12a is changed to the eccentric side surface 12a. May be configured to be larger than the plate thickness tb of the two surfaces 12b adjacent to.

(3) In the above-described embodiment, an example is shown in which the eccentric beam EB is eccentrically joined to the core portion 10 of the column 1 in the width direction toward the corridor R side. Eccentric in the appropriate width direction.

(4) In the above-described embodiment, the case where the core unit 10 is configured as the core module M separate from the pillar 1 and the beam 2 has been described as an example, but as a member integrated with the pillar 1 and the beam 2. It may be configured, and the components may not be assembled in advance, but may be assembled at the site where the columns 1 and beams 2 are assembled.

(5) In the above-described embodiment, the case where the vertical stiffener 13 is formed by a flat plate member different from the rectangular steel pipe column portion 12 has been described as an example, but the eccentric side surface 12a of the rectangular steel pipe column portion 12 By extending the plate portion of the two adjacent surfaces 12b to the eccentric side, the vertical stiffener 13 may be formed by the extension.

DESCRIPTION OF SYMBOLS 1 Column 2 Beam 2A Beam flange 2B Beam web 10 Core part 10A Projection joint part 11 A pair of upper and lower diaphragms 12 Square steel pipe pillar part 12a Eccentric side surface 12A Eccentric side surface plate ta Eccentric side surface thickness 12b Two surfaces tb adjacent to the eccentric surface tb Two plate thicknesses adjacent to the eccentric surface 12d A surface td opposite to the eccentric surface td A plate thickness 13 opposite to the eccentric surface Stiffener M core module

Claims (5)

A pair of upper and lower diaphragms, a column-beam joint structure in which the beam is eccentrically joined in the width direction to a core portion of a column including a square steel pipe column portion between the pair of upper and lower diaphragms,
A beam-column connection structure in which, in the rectangular steel tube column portion, the plate thickness of two surfaces adjacent to the eccentric surface is set to be larger than the plate thickness of the eccentric surface.   2. The beam-column connection structure according to claim 1, wherein the web of the beam made of H-section steel and the plate portion on the eccentric side of the square steel tube column are arranged in a straight line in plan view.   3. The beam-column connection structure according to claim 1, wherein, in the rectangular steel tube column portion, a plate thickness of a surface opposite to the eccentric surface is set smaller than a plate thickness of the eccentric surface. 4.   The core portion is provided with a projecting joint portion in which the flange of the beam made of an H-shaped steel is joined in a state of projecting outward from an eccentric side surface of the square steel tubular column portion, and the projecting joint portion is provided. The vertical beam stiffener according to any one of claims 1 to 3, wherein a vertical stiffener is provided between the pair of upper and lower diaphragms.   The column-beam connection structure according to any one of claims 1 to 4, wherein the core portion is configured as a core module separate from the column and the beam.

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