JP-2026075902-A - Column beam joint structure

JP2026075902AJP 2026075902 AJP2026075902 AJP 2026075902AJP-2026075902-A

Abstract

[Problem] To provide a column-beam joint structure that can reduce manufacturing costs by reducing the plate thickness and excess length of the steel plates that form the panel core. [Solution] A column-beam joint structure 100 is provided, in which the bending strength of the steel column 20 is included in the design of the plate thickness tp based on the out-of-plane bending strength of the steel plates 1 and 2. The upper end 12 and lower end 14 of the panel core 10 is welded together, and the upper column 20A and lower column 20B, which are steel columns, are welded together. A steel beam 30 is welded to the center position CP of at least one of the steel plates 1 and 2. The core depth of the panel core 10 is greater than the beam depth of the steel beam 30, and there are excess lengths 50 and 60 between the upper end 12 and/or lower end 14 of the panel core 10 and the upper end 32 and/or lower end 34 of the steel beam 30. [Selection Diagram] Figure 3

Inventors

永峰頌子
吉田文久
西拓馬

Assignees

大和ハウス工業株式会社

Dates

Publication Date: 20260511
Application Date: 20241023

Claims (4)

A column-beam joint structure comprising a four-sided box-type, non-diaphragm panel core, to which four steel plates are welded together, with upper and lower steel columns welded to the upper and lower ends, a steel beam welded to the center of at least one of the four steel plates, the core depth of the panel core being greater than the beam depth of the steel beam, and an excess length between the upper and/or lower ends of the panel core and the upper and/or lower ends of the steel beam, A column-beam joint structure characterized in that the design of the plate thickness based on the out-of-plane bending strength of the steel plate includes the bending strength of the steel column.
The steel beam is welded to the center of at least one of the four steel plates. The column-beam joint structure according to claim 1, characterized in that a separate steel beam is welded to at least one of the four steel plates at a position eccentrically offset from the center of that steel plate in at least one direction, either vertically or horizontally.
The aforementioned steel columns are formed from square steel pipes, The aforementioned steel beam is formed from H-shaped steel, The column-beam joint structure according to claim 1 or 2, characterized in that the rectangular steel pipe is located inside the thickness of the panel core.
The column-beam joint structure according to claim 1 or 2, characterized in that the thickness tp of the steel plate to which the steel beam is welded at the center of the steel plate satisfies the following two conditional equations (A) and (B) based on yield line theory.

Description

This invention relates to a column-beam joint structure. In steel-framed buildings where square steel pipes are used as steel columns and H-shaped steel beams are used as steel beams, various types of column-beam joints are employed, including through-diaphragm and internal diaphragm types. The through-diaphragm column-beam joint structure has a panel core made of square steel pipes, with through-diaphragms welded and fixed to the outside of the panel core at positions corresponding to the upper and lower flanges of the steel beams. The flanges of the H-shaped steel beams are welded to the outwardly protruding through-diaphragms, and the upper and lower square steel pipe columns are welded to the upper and lower through-diaphragms. Furthermore, if the beam depths of the left and right steel beams differ, an internal diaphragm is welded to the panel core at a position corresponding to, for example, the flange of the steel beam with the lower beam depth, in addition to the upper and lower through-diaphragms. However, these through-diaphragm and internal-diaphragm column-beam joint structures tend to require more manufacturing steps and longer welding lengths, resulting in a generally more complex manufacturing process, longer production times, and higher manufacturing costs. Therefore, Patent Document 1 proposes a column-beam joint structure for joining the columns and beams of a building in a so-called non-diaphragm type, where the diaphragm is omitted. The column-beam joint structure described in Patent Document 1 (here, the column-beam joint structure) is a column-beam joint structure in which a rectangular steel pipe column and a steel beam are joined to a non-diaphragm type steel panel core. The steel panel core consists of four steel plates joined to each other via welds, with a rectangular cross-sectional shape perpendicular to the extension direction. The thickness of the steel plates is greater than the thickness of the rectangular steel pipe column. The core depth of the steel panel core is greater than the beam depth of the steel beam. There is an excess length between the upper and/or lower ends of the steel panel core and the upper and/or lower ends of the steel beam, and the excess length lp of the excess length satisfies a conditional equation based on yield line theory. Patent No. 7009141 This is a perspective view of an example of a panel core forming a column-beam joint structure according to the embodiment.This is a view from the direction of arrow II in Figure 1.This is a perspective view of an example of a column-beam joint structure according to the embodiment.This is a view from the arrow pointing in direction IV in Figure 3.This is a cross-sectional view taken along line V-V in Figure 3.This is a diagram illustrating the out-of-plane bending yield mechanism. The following description of the column-beam joint structure according to the embodiment will be given with reference to the attached drawings. Note that in this specification and the drawings, substantially identical components may be denoted by the same reference numerals to avoid redundant explanations. [Column-beam joint structure according to this embodiment] An example of a column-beam joint structure according to the embodiment will be described with reference to Figures 1 to 6. Here, Figure 1 is a perspective view of an example of a panel core forming the column-beam joint structure according to the embodiment, and Figure 2 is a view taken in the direction of arrow II in Figure 1. Figure 3 is a perspective view of an example of a column-beam joint structure according to the embodiment, and Figures 4 and 5 are a view taken in the direction of arrow IV and a cross-sectional view taken along V-V in Figure 3, respectively. Furthermore, Figure 6 is a diagram illustrating the out-of-plane bending yield mechanism. The steel panel core 10 is formed from a total of four steel plates 1 and 2, two of each with different widths. At both ends of the relatively shorter steel plate 2, a tapered groove 2a with an inclination angle of approximately 30 to 50 degrees is formed along the extension direction of the steel plate 2. The longer steel plate 1 and the shorter steel plate 2 are arranged as shown in Figure 1, and backing plates 4 are placed along the shorter steel plate 2 at the four inner corners. Welded joints 3 are formed in the grooves 2a, creating a hollow, rectangular prism-shaped steel panel core 10 (a four-sided box). As shown in Figure 2, the planar shape of the panel core 10 is a square with side length Dp. However, depending on the cross-sectional shape of the upper and lower columns joined to the upper end 12 and lower end 14 of the panel core 10, the panel core may have a shape other than a square, such as a rectangular planar shape. Furthermore, the thickness tp of the steel plates 1 and 2 is thicker than that of a typical panel core with a diaphragm. This thickness tp will be explained in detail below. The welded joint 3