JPH04366248A - Connecting structure for square steel pipe-concrete column and steel beam - Google Patents

Abstract

PURPOSE:To materialize structure connecting part for a square steel pipe- concrete column and steel beam, which is excellent in transfer of stress, manufacturable in excellent design yet at low costs and is available for easy filling of concrete. CONSTITUTION:Steel plates 12 positioned near to a connection of a column 1 and beams 2 are made thicker than the steel plate 11 on other parts. Cover plates 23 in the width wider than the width of a beam flange 21 are placed over parts whereat the flanges 21 of the beam 2 are connected to the column 1.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a joint between a square steel pipe concrete column and a steel beam used in steel-framed high-rise buildings.

0002

[Prior Art] The joint (also called the joint part) between a square steel pipe concrete column and a steel beam, in which concrete is filled inside the steel pipe, is used to reliably transmit stress such as shear force and moment from the beam to the column. Generally, an outer diaphragm or an inner diaphragm is attached in the cross-sectional direction of the column side at the joint between the column and the beam flange. FIG. 3 shows an example of the outer diaphragm type joint, and FIG. 4 shows an example of the inner diaphragm type joint. 1 is a square steel pipe column, 2 is a steel beam, 3 is an outer diaphragm, and 3' is an inner diaphragm. Normally, the steel pipe column is filled with concrete as soon as construction is completed at the site. By the way, the outer diaphragm shown in Fig. 3 has a fundamental weakness in that the flange protrudes greatly at the joint, making it difficult to fit in the design, and is not preferred by designers, while the inner diaphragm shown in Fig. 4 is expensive to manufacture. Another disadvantage is that it is difficult to fill the inside of the column with concrete.

[0003] In order to solve these problems, Japanese Unexamined Patent Application Publication No. 62
-141235, the diaphragm is omitted by providing a projection on the inner surface of the pillar of the joint part, or JP-A-63-30
It has been proposed to provide a through hole for filling concrete in the inner diaphragm, as in Japanese Patent No. 4845.

0004

[Problem to be Solved by the Invention] All of these proposals aim for other effects at the expense of any of the requirements such as stress transmission, excellent design, concrete filling properties, manufacturing cost, etc. However, it is not a complete solution. An object of the present invention is to realize a column-beam joint structure that satisfies all of these requirements and is easy to implement.

[0005]

[Means for Solving the Problems] The present invention provides for, at the joint between a square steel pipe column and a steel beam whose interior is filled with concrete, the thickness of the column near the joint to be thicker than the general part, and the beam flange The beam is characterized in that a cover plate wider than the beam flange is attached to the joint portion with the column.

[0006]

[Function] According to the present invention, since there is no diaphragm inside the column, it is easy to fill with concrete and the manufacturing cost of the column is reduced.There is also no outer diaphragm, so there is no problem in terms of design, and the cover plate is attached to the beam flange. By attaching the beam to the column, stress concentration at the joint between the beam and the column can be alleviated and stress transmission can be ensured.

[0007]

[Embodiment] An embodiment of the present invention is shown in FIG. Column 1 is a steel plate
(also called skin plates) are assembled into a box shape on four sides.The steel plate 11 that constitutes the general part and the steel plate 12 that constitutes the column material at the column-beam joint have different plate thicknesses, and the The joint part uses a thicker plate than the general part, and the diaphragm is omitted. On the other hand, the beam 2 connected to this column is an H-beam steel whose flanges are oriented vertically and horizontally, and the upper and lower flanges 21, 21, and web 22 are each welded to the skin plate 12 of the thick part of the column material by the usual method. ing.

Furthermore, in the present invention, a cover plate 23 is applied to the outside of the upper and lower flanges 21, 21 of the beam 2, and is attached to both the beam flange 21 and the column skin plate 12 by welding. As seen in FIG. 1, since the column side of the cover plate overlaps the beam flange, the previously welded plate can serve as a backing metal for later welding. As shown in Figure 2, the shape of the cover plate 23 is such that the column side is close to the width of the column, the welding line is made as long as possible, and the angle α shown in the figure is 30 to 30 degrees in order to save material and alleviate stress concentration. About 45 degrees is good.

[0009]

[Effects of the Invention] With the above structure, it is possible to avoid providing a diaphragm inside the column, thereby reducing the manufacturing cost of the column and making it easy to fill the column with concrete. Since there is no external diaphragm, there are no design restrictions, and by attaching the cover plate stress concentration at the column attachment part at the end of the beam is alleviated, and stress transmission is ensured.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a column-beam joint of the present invention seen from the side.

FIG. 2 is a sectional view taken along line AA in FIG. 1;

FIG. 3 is a perspective view of a conventional outer diaphragm system.

FIG. 4 is a perspective view of a conventional inner diaphragm system.

[Explanation of symbols]

1 Square steel pipe column 2 Steel beam 23 Cover plate 3, 3’ diaphragm

Claims (1)

[Claims] [Claim 1] At the joint between a square steel pipe column whose interior is filled with concrete and a steel beam, the plate thickness of the column near the joint is made thicker than that of the general part, and at the joint of the beam flange with the column, A joint structure between a square steel pipe concrete column and a steel beam, characterized in that a cover plate wider than the beam flange is attached.