JPH081331A - Welding method in beam-column joint - Google Patents

Abstract

PURPOSE:To eliminate a defect in section of a web, and to attain a beam-column joint with high structure strength. CONSTITUTION:Notch grooves Ga and Gb corresponding to the sections of backing strips Ha and Hb are cut on the tip parts of a web (c) in a H-shape steel B. A series of the backing strips Ha and Hb corresponding to the widths of flanges (a) and (b) are put on these notch grooves Ga and Gb. And, entire circumference welding is performed to the backing patches Ha and Hb and the web (c) to clog the notch grooves Ga and Gb.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of welding a beam-column joint in a building steel frame.

[0002]

2. Description of the Related Art FIG. 5 shows the structure of a beam-column joint in a conventional building steel frame. That is, A is a square column that constitutes a pillar material, B is an H-shaped steel that constitutes a beam material, a and b are flanges c are webs connecting both flanges a and b, and Ca and Cb are ends of the flanges a and b. Groove portion Da formed in the
Db is a scalloped portion Fa, Fb provided by cutting out the end portion of the web c, and backings are arranged inside the flanges a, b.

In the above-mentioned conventional construction, the ends of the flanges a, b, the diaphragms m, n of the joint E, and the end face of the web c and the abutting portion of the vertical flat surface Ea are welded all around to form the required structure. To complete the beam-column joint.

[0004]

As described above, in the conventional welding method, the scallop portions Da and Db are formed by notching the end portion of the web c, and the scallop portions Da and Db are formed in the width direction of the flanges a and b. A series of backing metals Fa and Fb are attached. Therefore, there is a feature that welding can be made continuous. On the other hand, however, it is pointed out that the scallops Da and Db cause a large number of cross-section defects in the web c, leading to a decrease in strength and concentration of stress, strain, and the like.

Further, it has become clear that there is a risk of brittle fracture in some cases such as when a large external force acts due to a decrease in plastic deformation capability due to notches and the like accompanying scalloping. The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to provide a rational beam-column welding method without problems such as reduction in strength and concentration of stress. It is a thing.

[0006]

In order to achieve the above object, the present invention is as follows. That is, the gist thereof is that a notch groove corresponding to the cross-sectional dimension of the backing metal is formed in the end of the web in the H-section steel,
A step of mounting a series of backing metal corresponding to the width of the flange inside the notch groove and corresponding to the flange width, and welding the backing metal and the web all around to close the notch groove. It is a thing.

[0007]

The notch groove in the web allows the backing plate to be mounted in series over the entire width of the flange. Since the size of the notch groove is provided corresponding to the cross-sectional size of the backing metal, the gap can be completely filled by welding the web and the backing metal. Therefore, it is possible to eliminate the cross-section loss of the web.

[0008]

EXAMPLE A method for welding a beam-column joint portion according to the present invention will be described below with reference to examples. FIG. 1 is a front view of a beam-column joint structure to which this welding method is applied. In this figure, parts that are the same as or equivalent to those of the conventional structure are denoted by the same reference numerals, and redundant description will be omitted. By the way, A is a square column B is an H-shaped steel a, b is a flange c, a web Ca, Cb is a groove portion E is a joint portion Ea is a vertical flat surface portion.

Next, in FIG. 2, Ga and Gb are notch grooves provided inside the flanges a and b at the end of the web c.
The notched grooves Ga and Gb correspond to the cross-sectional size of the backing metal described later, and have a size such that they can be inserted with some play. Ha and Hb are backing metals, and the length dimension thereof is a series corresponding to the width dimension of the flanges a and b (see FIG. 3).

Now, with reference to FIG. 4, the notch grooves Ga, Gb
A processing machine for cutting the groove portions Ca and Cb will be described. 1 is a table on which the H-section steel B is placed. The H-section steel B on the table 1 is clamped and fixed in place by an appropriate vise means (not shown). 2 is a cutting head that moves up and down the upper and lower guides 3. The cutting head 2 is provided with three spindles, each of which has a cylindrical driving cutter 4, a disc-shaped groove cutter 5, and a conical groove cutter 6. Install.

The close-up cutter 4 close-cuts the ends of the flanges a and b, and simultaneously cuts the root face f shown in FIG. The groove cutter 6 also forms a sloped surface e on the end surfaces of the flanges a and b. Further, the groove cutter 5 cuts a notch groove Ga (Gb) at the end of the web b. The above-mentioned cutting head 2 performs cutting when it is moved upward.

In manufacturing the beam-column joint, the corner column A is used.
To weld H-section steel B to To do that,
First, the backing metal plates Ha and Hb are inserted into the notch grooves Ga and Gb, and the amount of protrusion of the end portions is adjusted and temporarily fixed. After this temporary fixing, the backing metal plates Ha, Hb and the web c are welded all around to form the notch G.
Block a and Gb. This welding is usually performed in advance.

If this is done, the above backing metal H
The ends of a and Hb are brought into contact with the inner surfaces of the diaphragms m and n,
Position. This positioning is H for the corner column A.
This is the setting of the mounting position of the section steel B. The back deposit Ha,
When Hb contacts the diaphragms m and n, the tip of the web c corresponds to the vertical plane Ea.

When the setting of the H-section steel B is completed in this manner, the groove portions Ca and Cb of the flanges a and b and the diaphragms m and n are welded, and the web c and the vertical plane portion Ea are welded.
Weld the butted part with. By completing the welding as described above, it is possible to eliminate the cross-section loss of the web c and obtain a high-strength beam-column joint.

In the above embodiment, the cutout groove G is formed in advance.
The gap between a and Gb was filled, and then the H-shaped steel B was welded to the square column A. However, the backing metal plates Ha and Hb were left temporarily fixed, and the H-shaped steel B was joined. The above gap may be filled when welding to E.

Further, in one embodiment, the case where the H-section steel B is welded to the square column A through the joint E is explained. However, the procedure is the same when the H-section steel B is directly welded to the square column A to form the beam-column joint. In this case, an H-section steel flange would be welded to the vertical plane of the square column.

[0017]

As described above, according to the welding method of the beam-column joint portion according to the present invention, the H-section steel can be joined to the column member without causing a cross-section loss. Therefore, it is possible to obtain a rational beam-column joint having high strength and no stress concentration. Further, the problem of plastic deformation ability due to the notch pointed out in the past can be solved at the same time.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a beam-column joint to which a welding method according to the present invention is applied.

FIG. 2 is likewise an explanatory view showing a configuration of a main part of a beam-column joint.

FIG. 3 is likewise a perspective view.

FIG. 4 is an explanatory diagram of a processing apparatus for obtaining a main part configuration.

FIG. 5 is an explanatory diagram showing a configuration of a conventional beam-column joint.

[Explanation of symbols]

 A Square pipe B H-shaped steel a, b Flange c Web Ca, Cb Groove part Ga, Gb Notched groove Ha, Hb Backing plate Ea, Eb Vertical plane part

Claims (1)

[Claims] 1. When an H-section steel is used as a beam material and a flange and a web of this H-section steel are joined to a column material such as a square column to form a beam-column joint, the web of the H-section steel is A notch groove corresponding to the cross-sectional dimension of the backing metal is cut at the end, and a series of backing metal corresponding to the flange width is attached inside the flange inside this notch groove. A welding method in a beam-column joint, which comprises a step of welding all around to close the notched groove.