JPS59138648A - Thin perforated h-shaped steel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thin-walled perforated web H-section steel mainly suitable as a steel frame material for columns or beams of steel reinforced concrete construction.

Generally speaking, in H-beams used as steel frame materials buried in columns or beams of steel-framed reinforced concrete construction, the flanges bear most of the bending stress of the columns or beams, so they require a large cross section, and they are arranged parallel to the flanges. In order to facilitate the placement of the main reinforcing bars at the column-beam intersections, the steel beams need to be narrow enough to not interfere with the on-site assembly of the steel frames, so the walls are thick.
- In the web, the reinforced concrete part bears most of the shear core force of the column or beam, so the shear core force is small, and buckling is completely restrained by the reinforced concrete part, so its thickness is very thin. good.

However, conventionally, H-section steel whose web thickness is approximately 1/2 or less of the flange thickness (hereinafter referred to as thin-walled H-section steel) has been manufactured during the cooling process after rolling, as shown in Figure 1. In this process, buckling waves called cooling waves 4 and accompanying residual stress are likely to occur in the web 6, which has the drawback of lowering strength performance and significantly lowering appearance and shape performance.

The present invention aims to eliminate the drawbacks of the conventional thin web H-section steel mentioned above, and will be explained in detail with reference to the drawings showing the following embodiments.

In the embodiments shown in FIGS. 2, 6, 4 and 5, the web 6 of the thin-walled H-section steel 1' is provided with circular or oblong shapes at approximately equal intervals in its longitudinal direction. Through hole 5A,
A square or rectangular through hole 5B with one side parallel to the edge of the web 6, a parallelogram through hole 5C with one side at approximately 45 degrees to the edge of the web 6, and one side parallel to the width direction of the web 6. Triangular through holes 5D are formed alternately parallel to the edges.

When the above-mentioned through holes 5A to 5D are formed by fusing or shearing at a time when the cooling wave 4 is not yet generated in the web 6 and cooling is not yet completed, the web 6 cools rapidly due to its thin wall. The compressive strain in the axial direction of the web 6 caused by the slow cooling of the thick flange 2 is eliminated by the shape of the through hole 5 being slightly reduced and deformed mainly in the axial direction of the material. 6, cooling waves 4 due to buckling are hardly generated.

In addition, the above-mentioned through holes 5A to 5D are drilled through cooling kneading 4 using a web filter.
When cutting or shearing is performed after the latter half of the cooling period when the cooling wave 4 has already occurred, most of the compressive strain forming the cooling waves 4 of the web 6 is caused by the shapes of the through holes 5A to 5D being mainly oriented in the axial direction of the material. Since the cooling wave 4 is canceled by a slight reduction deformation, the cooling wave 4 is greatly reduced in width.

Furthermore, in any of the above cases, the slight remaining cooling waves can be easily corrected with a roll or press.

In addition, the costs required for the above-mentioned fusing or new formation of through holes and roll straightening or press straightening are much cheaper than the costs required for hot rolling of H-beam steel because the equipment and work are simple. It is.

According to the present invention, as described above, the thin-walled perforated web H-section steel 1
(1) thin-walled web H-section steel with excellent cross-sectional performance can be easily and inexpensively supplied as a steel frame material for columns or beams in steel-framed reinforced concrete structures; When used as the steel frame of a column or beam, the adhesion performance between the thin-walled H-shaped steel and reinforced concrete is greatly improved due to the perforation, so the strength of the steel reinforced concrete column or beam is improved.
Furthermore, (3) the through-holes in the web can be used as sleeve holes for pipes or ducts penetrating the beams, so there is no need to newly drill holes in the web, which is extremely useful in practice.

Although the above description has been made as a steel frame material for columns or beams of steel-reinforced concrete structures, it is of course possible to use it as a material for columns or beams of steel-frame structures.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional thin web rolled H section steel, and FIGS. 2 to 5 are perspective views of a thin playback L web H section steel according to the present invention. In the figure, 1 is a thin perforated web H-shaped copper, 2 is a flange, 6 is a web, 4 is a cooling wave, 5A is a circular or oval hole, 5B is a square or rectangular transparent JL, and 5C is a parallelogram. 5D is a triangular hole. Figure 2 Figure 4

Claims (1)

[Claims] A thin-walled perforated web H-section steel, characterized in that the web is made of an H-section steel whose thickness is approximately 1/2 or less of the Franz thickness, and through holes are bored at intervals in the longitudinal direction thereof.