Section steel and wall body using the section steel

Abstract

An object of the present invention is to obtain a shaped steel beam having a strong bonding force with respect to concrete, and to obtain a wall with a reduced thickness. An H-beam has a plurality of projections on an inner face, and satisfies the conditions P / h≦10 and P / b2≧4, where b2 represents the upper-side width of the projections, h represents the projection height, and P represents the projection pitch in a cross section perpendicular to the inner face having the projections. A wall uses the H-beam as a structural member. In the wall, H-beams stand at a plurality of positions in the longitudinal direction of the wall with outer faces of flanges pointing toward the surface of the wall.

Description

TECHNICAL FIELD [0001] The present invention relates to a shaped steel beam that is applicable to the fields of civil engineering and construction, and to a wall using the shaped steel beam. BACKGROUND ART [0002] As a composite steel-concrete structure, for example, projections are provided on the surface of an H-beam, and concrete is provided around the H-beam. As such an H-beam with projections, an H-beam having projections on inner faces of flanges is known (for example, Japanese Examined Patent Application Publication No. 1-55042). [0003] As a wall using shaped steel beams as core materials, for example, an SRC wall using H-beams 101 is known, as shown in FIG. 27. The wall shown in FIG. 27 includes horizontal reinforcements 104 extending on both sides of concrete 103 in the horizontal direction of the wall, and main reinforcements 105 extending in the vertical direction of the wall so as to cross the horizontal reinforcements 104. H-beams 101 are provided in the center of the wa...

AI Technical Summary

Benefits of technology

[0009] Accordingly, a second object of the present invention is to obtain a wall having a reduced thickness.

[0073] Regarding h≦b1, when the projection lower-side width b1 is too small, the projections may deform and reduce the effect of preventing displacement of the concrete. Therefore, the width b1 is set to be at least equal to or larger than the projection height h.

[0074] The above description is given of the projection lower-side width b1. When the projection upper-side width b2 is too large, this also reduces the shearing area (reduces the shearing stress) with respect to the concrete. Therefore, it is necessary to impose a certain limitation to the width b2. However, this limitation does not need to be added because 4b2≦P is given in the above (2) as the restrictive expression for preventing the shearing stress τ2 from decreasing.

Problems solved by technology

By study, the present inventor found that, even when projections are provided on inner faces of a shaped steel beam, a sufficient bonding force cannot always be obtained depending on the size and arrangement of the projections.

However, in the wall shown in FIG. 27, it is difficult to reduce the thickness of the wall while maintaining the bearing force of the wall.

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