JPH07324419A - Flat slab construction - Google Patents

Abstract

PURPOSE:To bear force concentrated in the vicinity of a column capital and to equally and smoothly transfer the force to the column by incorporating an H-shaped steel reinforcing material constituted of cruciform bearing materials and a frame body surrounding the bearing materials in a flat slab. CONSTITUTION:H-shaped steel bearing materials are crossed cruciformly and are mounted on a column capital section 2 of a column 9 bearing a slab 7, and an H-shaped frame body 4 is surrounded in the shape of a square and is welded to the ends of the bearing materials 3 to form a reinforcing material 1. Through-holes for reinforcing monolithic efficiency with concrete of the slab 7 are provided to an H-shaped steel web of the frame body 4. Upper end reinforcing bars 5 and lower end reinforcing bars 6 of the slab 7 are arranged respectively to upper snd lower surfaces of the reinforcing material 1, and the flat slab 7 having the reinforcing material 1 therein is formed. The bearing materials 3 bear shear force, punching shear and bending stress concentrated in the vicinity of the column capital section 2, and the frame body 4 absorbs the force to transfer it to the column 9 equally and smoothly.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a flat slab structure.

[0002]

2. Description of the Related Art Conventionally, in a flat slab structure, a large bending stress, a shearing force, and a punching shear work on the slab around the column head. .
However, in such a structure in which the capital 10 projects below the slab 20 around the stigma, the effective floor height 20a of the building cannot be reduced and the space cannot be effectively used. There was a problem that it was troublesome.

Therefore, in order to eliminate such a defect,
A non-capital flat slab structure 30 like Japanese Patent Publication No. 5-39123 has been developed. This is a structure in which a reinforcing material 50 radially formed by a flat plate 40 is incorporated in a slab in a stigma, and the shearing force and punching shear are borne by the reinforcing material 50 to eliminate the conventional capital around the stigma. Is.

[0004]

However, the non-capital flat slab structure as described above can bear the shearing force and punching shear concentrated in the slab around the column head, but can hardly bear the bending stress. There was a problem.

Further, as shown in (2) of FIG. 4, since the reinforcing material is radially formed, the shearing force and punching shear concentrated on the slab around the column head can be evenly and smoothly transmitted to the column. There wasn't.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is, in a flat slab structure without capital, a bending force in addition to a shearing force and a punching shear concentrated on the slab around the stigma. It is to provide a flat slab structure that can bear stress and can evenly and smoothly transmit these forces to a column.

[0007]

The flat slab structure of the present invention for achieving the above object is a flat slab structure without a capital, which is formed by H-shaped steel in a cross shape and supported by a stigma. A reinforcing material composed of a material and a frame body provided at an end portion of the supporting material so as to surround the support material is incorporated in a slab, wherein the frame body is an H-shaped steel. And the frame body is provided with a through hole.

[0008]

According to the above construction, since the supporting member supported by the stilts is made of H-shaped steel, this supporting member can bear not only shearing force and punching shear but also bending stress, and these forces The frame can be taken in and transmitted to the pillar evenly and smoothly. Further, since the frame body is made of H-shaped steel, it is possible to widen the range of bending stress. Further, by providing the through hole in the frame body, the slab and the frame body are integrated with each other, that is, the edge with the concrete is not cut, so that bending stress and the like can be reliably transmitted to the column.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the flat slab structure of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a vertical sectional view of a flat slab structure of the present invention, and FIG. 2 is a plan view thereof.

As shown in FIG. 1, the flat slab structure A of the present invention has a structure in which a reinforcing material is built in the slab of the column head 2.

As shown in FIG. 2, the reinforcing member 1 includes a cross-shaped supporting member 3 supported by a column head 2 and a frame member 4 attached to an end of the supporting member 3 so as to surround the supporting member 3. It consists of and.

The support member 3 is made of H-shaped steel, and the crossing portion is placed on the pillar head 2 and the end portion is welded to the frame body 4. The frame body 4 is also formed in a rectangular shape by welding an H-shaped steel material like the support material 3. A flat slab 7 is formed by arranging the upper end streaks 5 of the slab on the upper surface of the reinforcing material 1 and the lower end streaks 6 on the lower surface thereof, and the reinforcing material 1 is built into the flat slab 7. ing.

Since the support member 3 is made of H-shaped steel as described above, the support member 3 can bear the bending stress.

FIG. 3 is a distribution diagram of bending moments in the slab around the stilts. Where X
Is the total bending stress that the slab bears,
In the case of a slab without a reinforcing material, all of the bending stresses a to d must be borne by the reinforced concrete portion of the slab, so a slab thickness that can bear this bending stress is required.

Further, Y represents the bending stress carried by the reinforcing member in the total bending stress carried by the X, that is, the slab in the slab containing the radial reinforcing member. Therefore, since the bending stresses a to c are borne by the reinforced concrete portion of the slab, the slab thickness that can bear this bending stress is required.

Further, Z represents the bending stress carried by the reinforcing material in the X, that is, the total bending stress carried by the slab in the slab incorporating the reinforcing material of the present invention. Therefore, since the bending stress of ab is borne by the reinforced concrete portion of the slab, the slab thickness that can bear this bending stress is required.

As described above, since the reinforcing material of the present invention can bear more bending stress than the conventional reinforcing material, the slab can be made thinner.

FIG. 4 is a diagram showing the contour lines of the stress distribution between the conventional radial reinforcing member 8 and the reinforcement member 1 of the present invention. As shown in (1), the present invention shows the contour lines of the stress distribution. As a result, the shear force, punching shear, and bending stress can be evenly distributed and smoothly transmitted to the column 9.

FIG. 5 shows the reinforcing member 1 in which the supporting member 3 is formed in a lattice shape. By forming the supporting member 3 in such a lattice shape, a larger bending stress can be beared. The slab thickness can be further reduced as compared with the conventional flat slab structure.

FIG. 6 shows a side surface of the frame body 4, that is, a part of the frame body 4 having a through hole 4b in the web 4a. The through hole 4b improves the integrity of the slab with concrete. Since it can be strengthened, the force concentrated on the slab around the pillar head 2 can be captured by the frame body 4 and reliably transmitted to the pillar.

[0021]

In a flat slab structure without a capital, a support member formed of H-shaped steel in an intersecting shape and supported by a stilt head and a frame body provided at an end portion of the support member so as to surround the support member. By incorporating the reinforcing material inside the slab, this supporting material can bear not only shearing force and punching shear but also bending stress, and these forces are taken in by the frame body to form a column evenly and smoothly. I can tell.

Since the frame is made of H-shaped steel, it is possible to widen the range in which bending stress is borne.

By providing the frame body with through holes, the slab and the frame body are integrated, that is, the edges of the concrete are not cut, so that bending stress and the like can be reliably transmitted to the column.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a flat slab structure.

FIG. 2 is a plan view of FIG.

FIG. 3 is a diagram showing the relationship between the total stress of the slab and the bending stress that the support material bears.

4 (1) and (2) are contour plots of the stress that the reinforcing material bears.

FIG. 5 is a plan view of a frame body in which a support material is formed in a lattice shape.

FIG. 6 is a perspective view showing a part of a reinforcing member provided with a through hole in a frame body.

FIG. 7 is a cross-sectional view of a conventional flat slab structure.

FIG. 8 is a perspective view of a flat slab structure containing a radial reinforcing member.

[Explanation of symbols]

 1 Reinforcement Material 2 Pillar Head 3 Support Material 4 Frame 5 Upper Reinforcing Bar 6 Lower Reinforcing Bar 7 Flat Slab 8 Radial Reinforcing Material 9 Column

Claims (3)

[Claims] 1. In a flat slab structure without a capital, a support member formed of H-shaped steel in an intersecting shape and supported by a stigma, and a frame body provided at an end of the support member so as to surround the support member. The flat slab structure is characterized in that the reinforcing material is built into the slab. 2. The flat slab structure according to claim 1, wherein the frame body is made of H-shaped steel. 3. The flat slab structure according to claim 1, wherein the frame body has a through hole.