KR102685205B1 - Compressive precast element strengthen above a top flange in H-shapes Steel Beam - Google Patents

Abstract

The present invention relates to a compressed precast reinforcement attached to a steel beam, and more specifically, by constructing a steel reinforcement and a shear anchor penetrating the steel reinforcement in the width direction and filling the inside with concrete to form a unit member, It is attached to the upper surface of the upper flange corresponding to the compression side of the steel beam using various methods such as welding and bolting, so a separate shear connector such as a stud is required on the upper flange of the steel beam for synthesis with the concrete of the floor plate. This relates to a compression precast reinforcement attached to a steel beam that not only reduces the compression resistance area of the steel beam, but also increases the compression resistance area of the steel beam.
A preferred embodiment of the present invention is a reinforcing body that is attached to the upper part of a steel beam to reinforce the steel beam, is made of steel, is formed with a width that is a certain width smaller than the width of the upper flange, and has a certain length filled with filler inside. A steel reinforcement; A shear anchor configured to penetrate the steel reinforcement in the width direction at regular intervals in the longitudinal direction of the steel reinforcement so that both ends each protrude by a certain length; It consists of a filler filled inside the steel reinforcement, and is attached in the longitudinal direction to the central part of the width direction of the upper surface of the upper flange of the steel beam for reinforcement.

Description

Compressive precast reinforcement attached to steel beam {Compressive precast element strengthen above a top flange in H-shapes Steel Beam}

The present invention relates to a compressed precast reinforcement attached to a steel beam, and more specifically, by constructing a steel reinforcement and a shear anchor penetrating the steel reinforcement in the width direction and filling the inside with concrete to form a unit member, It is attached to the upper surface of the upper flange corresponding to the compression side of the steel beam using various methods such as welding and bolting, so a separate shear connector such as a stud is required on the upper flange of the steel beam for synthesis with the concrete of the floor plate. This relates to a compression precast reinforcement attached to a steel beam that not only reduces the compression resistance area of the steel beam, but also increases the compression resistance area of the steel beam.

Steel structure, along with reinforced concrete structure, is a representative structural method of modern architecture and is widely used in buildings that require large spaces, from light buildings such as warehouses to high-rise buildings, hangars, gyms, airports, and factories.

In particular, large H-beams are generally used as beam members in steel structures to build long-span structures.

In the case of large H-beams, in order to improve resistance to bending moment, the width is narrow and the beam is relatively large compared to the distance between points. This may be effective in resisting bending moment, but the beam itself may sag due to the bending moment. At the same time, displacement occurs in the horizontal direction and tends to rotate the beam cross-section, causing bending and twisting problems in the member along its entire length. Accordingly, the nominal bending strength of the member does not demonstrate the strength of the actual cross section and is determined by the nominal strength based on the lateral torsional buckling strength, resulting in an ineffective bending strength of the member. In other words, the cross section of the H-beam consisting of the upper flange, lower flange, and web has a biaxially symmetrical cross section, so the greater the difference between the secondary moment of inertia about the weak axis compared to the secondary moment of inertia about the strong axis, the easier it is to twist the cross section. When exposed, twisting rotation occurs simultaneously with bending deformation, a phenomenon called bending-torsional buckling.

In particular, as shown in Figure 5, in the case of the conventional H-type steel beam 20, the hollow slab 40 is placed on the upper part of the steel beam 20 and then the slab concrete 60 is poured on the upper part. At this time, the slab concrete 60 is poured on the upper part of the steel beam 20. For synthesis, studs 270, etc. had to be installed separately on the upper surface of the upper flange of the steel beam 20.

The technology behind the present invention includes Patent Registration No. 1082575, “Long-span beam with reinforced cross-sectional rigidity” (Patent Document 1). In the above background technology, 'in the long-span beam attached to the strut (2) supporting the load of the structure in an above-ground parking lot, etc., it is formed of upper and lower flanges (12, 14) and a web (16), and one end of the prop ( 2) Steel material (10) fixedly attached to the top or side; A horizontal plate 22 is fixedly attached to the upper or lower flanges 12 and 14 in the longitudinal direction on both sides of the steel material 10, and is attached perpendicularly to the horizontal plate 22 and includes the upper and lower flanges ( At least one reinforcement angle (20) including a vertical plate (24) located between the upper and lower flanges (12, 14) or protruding from the upper and lower flanges (12, 14); And a bolt or weld joint 34 formed by a plurality of inclined members 32 arranged in the longitudinal direction of the steel material 10, the two adjacent inclined members 32 and the vertical plate 24, We propose a long-span beam with reinforced cross-sectional rigidity, which includes a truss-shaped reinforcing member 30.

However, the above background technology reinforced the H-shaped cross-section with a number of inclined materials on the side of the steel beam to enable long-term use, but there was a problem such as the cross-section becoming large due to lack of reinforcement on the compression side.

Patent Registration No. 1082575 “Long-span beam with reinforced cross-sectional rigidity”

The present invention is intended to solve the above problems, and is used by attaching to the upper surface of the upper flange corresponding to the compression side of the steel beam by various methods such as welding and bolting, so that the upper flange of the steel beam is connected to the concrete. The purpose is to provide a reinforcement that not only does not require separate shear connectors such as studs for composite, but also increases the compression resistance area of the steel beam.

The present invention relates to a reinforcing body attached to the upper part of a steel beam to reinforce the steel beam, comprising: a steel reinforcing body of a certain length made of steel, formed with a width smaller than the width of the upper flange, and filled with a filler inside; A shear anchor configured to penetrate the steel reinforcement in the width direction at regular intervals in the longitudinal direction of the steel reinforcement so that both ends each protrude by a certain length; Provides a compressed precast reinforcement body attached to a steel beam, which is composed of a filler filled inside the steel reinforcement body and is attached in the longitudinal direction to the widthwise central part of the upper surface of the upper flange of the steel beam for reinforcement. I want to.

In addition, the aim is to provide a steel beam-attached compressed precast reinforcement body, which is characterized in that the steel reinforcement body consists of a pair of plates spaced apart at a certain distance.

In addition, the aim is to provide a compressed precast reinforcement body attached to a steel beam, characterized in that the plate of the steel reinforcement body is formed with an upper reinforcement part extending in the horizontal direction in the inner or outer direction facing the upper end.

In addition, the aim is to provide a compressed precast reinforcement body attached to a steel beam, characterized in that the lower end of the plate of the steel reinforcement body is formed with a lower reinforcement part extending in the inner or outer horizontal direction.

In addition, the object is to provide a steel beam-attached compression precast reinforcement body, characterized in that the upper or lower ends of a pair of plates are formed so as to be integrally connected to have an n-type or u-type cross section.

In addition, it is intended to provide a steel beam-attached compressed precast reinforcement body, characterized in that the steel reinforcement body has a rectangular cross-section with an empty interior.

The steel beam-attached compression precast reinforcement body of the present invention attaches a compression precast reinforcement body, which is a compression resistance element composed of steel and concrete, on the upper flange of the steel beam, so that the neutral axis of the cross section is more neutral than the H-beam made of pure steel. The position (horizontal symmetry axis) is moved upward, increasing the efficiency of the lower flange, which not only increases the bending strength and bending rigidity of the cross-section, but also increases the value of the second moment of inertia about the vertical symmetry axis (weak axis) of the cross-section. As it is superior to the general H-beam cross section, resistance to bending-torsional buckling is also increased, ensuring excellent performance even in torsion, and shear connectors such as separate studs are required at the top of the upper flange of the steel beam for synthesis with concrete. Not only does it prevent this, but it has a very useful effect of increasing the compression resistance area of the steel beam.

The following drawings attached to this specification illustrate preferred embodiments of the present invention, and serve to further understand the technical idea of the present invention along with the detailed description of the invention. Therefore, the present invention is limited to the matters described in the attached drawings. It should not be interpreted as limited.
Figure 1 is a perspective view showing an embodiment in which the steel beam-attached compressed precast reinforcement of the present invention is attached to a steel beam.
Figure 2 is a cross-sectional view of Figure 1.
Figure 3 is a cross-sectional view showing various embodiments of the steel beam-attached compressed precast reinforcement of the present invention.
Figure 4 is a cross-sectional view showing an example of construction of a steel beam attached to a steel beam-attached compressed precast reinforcement of the present invention.
Figure 5 is a cross-sectional view showing an example of construction of a conventional steel beam.

Below, the present invention will be described in detail with reference to embodiments shown in the attached drawings, but the presented embodiments are illustrative for a clear understanding of the present invention, and the present invention is not limited thereto.

Hereinafter, the technical configuration of the present invention will be described in detail according to preferred embodiments.

Figure 1 is a perspective view showing an embodiment in which the steel beam-attached compression precast reinforcement of the present invention is attached to a steel beam, Figure 2 is a cross-sectional view of Figure 1, and Figure 3 is a steel beam-attached compression precast reinforcement of the present invention. It is a cross-sectional view showing various examples of the precast reinforcement, and Figure 4 is a cross-sectional view showing an example of construction of a steel beam to which the steel beam-attached compressed precast reinforcement of the present invention is attached.

As shown in Figure 1, the steel beam-attached compressed precast reinforcement body 10 of the present invention consists of a steel reinforcement body 110 and a shear anchor 120 that penetrates the steel reinforcement body 110 in the width direction, and has an internal Filling the filler 130, such as concrete, to form a unit member, and in the case of a steel beam 20 using H-beam steel, it can be used by attaching it to the upper surface of the upper flange 210 by various known methods such as welding and bolting. This is to increase the compression resistance area of the steel beam (20).

In general, the steel beam 20 uses a steel beam with an H-shaped cross section consisting of an upper flange 210, a lower flange 220, and a web 230. At this time, the compression precast of the present invention is placed on the upper surface of the upper flange 210. A reinforcing body 10 is attached to increase the compression resistance area. In addition, it can be attached to the upper part of steel beams such as floor beams and roof beams of various cross sections that are subject to the bending of a long span to reinforce bending strength and rigidity.

At this time, the compression precast reinforcement 10 of the present invention is configured in the width direction center portion of the upper flange 210 of the steel beam 20, so that the upper flanges 210 on both sides of the compression precast reinforcement 10 are provided. Ensure that there is sufficient space on the upper surface to hold slabs, decks, etc.

In addition, the compressed precast reinforcement 10 of the present invention may be formed over the entire length of the upper flange 210 of the steel beam 20, or may be formed only in a certain section, such as the longitudinal center of the steel beam 20. .

The compressed precast reinforcement body 10 of the present invention consists of a steel reinforcement body 110 of a certain length made of steel and a shear anchor 120 that penetrates the steel reinforcement body 110 in the width direction at regular intervals in the longitudinal direction. .

The steel reinforcement 110 is made of steel and has a certain length and has a width smaller than the width of the upper flange 210 of the steel beam 20, thereby forming the compressed precast reinforcement 10 of the present invention. When attached to the upper surface of the central portion in the width direction of the upper flange 210 of the steel beam 20, a mounting surface for holding a deck or slab, etc. can be provided on both sides.

Such a steel reinforcement 110 may be made of various shapes, including a pair of vertical plates that can be filled with filler 130 inside, an angle, a channel, a square tube, a circular tube, etc., as shown in Figure 3a ( As in a), the steel reinforcement 110 can be formed by a pair of plates 111 spaced apart at a certain distance. At this time, the pair of plates 111 are configured to have parallel vertical plate shapes, the upper gap between the pair of plates 111 is wide and the lower gap is narrow and inclined, or the lower gap between the pair of plates 111 is It can also be made wide and with the upper gap sloping narrowly.

A shear anchor 120 is formed to penetrate the pair of plates 111, and the shear anchor 120 is joined and fixed to the pair of plates 111 by welding, bolting, etc., and then the plates 111 and the plates are connected to each other. A unit member is formed by filling the filler 130 between (111).

The steel reinforcement 110 may be made to have a rectangular cross-section such as a rectangle or square with an empty interior, as shown in FIGS. 1 and 2, and in particular, as shown in FIGS. 3a(b) and 3a(d). Likewise, the plate 111 of the steel reinforcement 110 is formed with an upper reinforcement portion 112 extending in the inner horizontal direction facing the upper end, so that it serves as a reinforcement of the steel reinforcement 110 and at the same time, as shown in FIG. 4 Likewise, the horizontal reinforcing bar 50 connecting the hollow slab 40 and the hollow slab 40 is seated on the upper part of the steel beam 20 to provide a joining surface to be fixed by welding, bolting, etc. . At this time, the upper reinforcement portion 112 may be extended horizontally outward as shown in FIGS. 3A(c) and 3A(E).

In addition, the lower end of the plate 111 of the steel reinforcement 110 extends in the outer horizontal direction as in Figure 3a (c) or the lower reinforcement part ( 113) is formed so that it serves to reinforce the lower part and at the same time is stably seated on the upper part of the upper flange 210 of the steel beam 20 and provides a joint surface that can be joined by welding, bolting, etc. .

In addition, the steel reinforcement 110 has an n-shaped cross section as shown in FIG. 3b (a) or a u-shaped cross section as shown in FIG. 3b (e) so that it can be easily filled with filler 130 such as concrete for compression. It is also possible to form a precast reinforcement (10).

Therefore, in order to form an n-type or u-type cross-section, a connecting portion 117 is formed to integrally connect the upper or lower ends of the pair of plates 111, and in this case, also in FIG. 3b(b) It can be made to have a cross section such as a trapezoid or an inverted trapezoid as shown in FIG. 3b(c).

In addition, as shown in FIG. 3b (d), the lower end of the plate 111 of the steel reinforcement 110 may be formed to have a lower reinforcement portion 113 extending in the outer horizontal direction, and in FIG. 3b (f) As shown, the plate 111 of the steel reinforcement 110 serves to reinforce the upper or lower part by forming an upper reinforcement part 112 extending in the outer horizontal direction at the upper end, and at the same time, the upper flange of the steel beam 20 It is to be stably seated on the upper part of (210) and to provide a joint surface that can be joined by welding, bolting, etc.

In this way, when the steel reinforcement 110 is made of a pair of plates 111, an n-type cross-section, a trapezoidal cross-section, an inverted trapezoidal cross-section, a rectangular cross-section, a square cross-section, etc., as shown in FIG. 4, at the upper part of the steel beam 20 The hollow slab 40 and the horizontal reinforcing bar 50 connecting the hollow slab 40 can be seated and provide a joining surface to be fixed by methods such as welding and bolting.

The steel reinforcement 110 as described above penetrates the steel reinforcement 110 in the width direction at regular intervals in the longitudinal direction to form a shear anchor 120.

The shear anchor 120 may be made of various members such as reinforcing bars, steel wires, and angle lumber having a certain length, and both ends of the shear anchor 120 are each configured to protrude a certain length to the outside of the steel reinforcement 110. As shown in 4, a hollow slab (40) is mounted on the upper part of the steel beam (20) to which the compressed precast reinforcement (10) of the present invention is applied and serves as a shear connector when pouring the slab concrete (60) to form a steel material. There is no need to install separate studs, etc. on the beam 20.

Such a shear anchor 120 can be formed by making a through hole in the steel reinforcement 110, allowing the shear anchor 120 to pass through the through hole, and then fixing it by a method such as welding or bolting.

In particular, in the present invention, the filler 130 can be formed by filling the inside of the steel reinforcement 110 with concrete or mortar. When the steel reinforcement 110 is made of a pair of plates 111, the plate The filler 130 is filled between (111) and the plate 111, and when it has an n-type cross-section or a square cross-section, the filler 130 is filled inside, so that the bending deformation from the bending moment to the positive moment is achieved. When it is about to occur, you can increase the bending strength of the cross section and secure the bending rigidity by filling the upper part of the cross section in the center of the member with inexpensive concrete or mortar with excellent compression resistance.

In the case of large H-beams, in order to improve resistance to bending moment, the width is narrow and the beam is relatively large compared to the distance between points. This may be effective in resisting bending moment, but the beam itself causes deflection due to bending moment. At the same time, displacement occurs in the horizontal direction and tends to rotate the beam cross-section, causing bending and twisting problems in the member along its entire length. Accordingly, the nominal bending strength of the member does not demonstrate the strength of the actual cross section and is determined by the nominal strength based on the bending-torsional buckling strength, which determines the member bending strength, which is not effective. The cross section of the H-beam consisting of the upper flange, lower flange, and web has a biaxially symmetrical cross section, but the cross-sectional second moment value due to the vertical symmetry axis is relatively lower than the value of the second moment of section due to the horizontal symmetry axis of the upper and lower flanges. When the moment value is small, the tendency for horizontal displacement to occur is more dominant than the tendency for deflection to occur, and bending-torsional buckling becomes the dominant mode. In particular, when the cross section of H-beam is relatively long span span compared to the cross section, the bending strength is determined by bending-torsional buckling strength.

Therefore, in the present invention, by attaching a compression precast reinforcement, which is a compression resistance element made of steel and concrete, on the upper flange of the steel beam, the neutral axis of the cross section (horizontal symmetry axis) is moved to the upper part than that of the H-beam made of pure steel. Not only does the efficiency of the lower flange increase by moving, thereby increasing the bending strength and bending rigidity of the section, but the compressed precast reinforcement increases the value of the second moment of inertia about the vertical symmetry axis (weak axis) of the section, making it superior to the general H-beam section. Resistance to bending-torsional buckling is also increased, ensuring excellent torsional performance, and not only does it not require shear connectors such as separate studs on the top of the upper flange of the steel beam for composite with concrete, but also reduces the compression of the steel beam. It has a very useful effect of increasing the resistance area.

So far, the present invention has been described in detail with reference to the presented embodiments, but those skilled in the art can make various variations and modifications without departing from the technical spirit of the present invention with reference to the presented embodiments. will be. The present invention is not limited by such variations and modifications, but is limited by the claims appended below.

10: Steel beam attached compressed precast reinforcement
110: steel reinforcement
111: plate
112: upper reinforcement part
113: lower reinforcement part
120: Shear anchor
130: Filling material
20: Kang Jae-bo

Claims (6)

In the reinforcement body attached to the upper part of the steel beam 20 to reinforce the steel beam 20,
A steel reinforcement body 110 of a certain length made of steel and formed with a width smaller than the width of the upper flange 210 and filled with a filler 130 therein;
A shear anchor 120 that penetrates the steel reinforcement 110 in the width direction at regular intervals in the longitudinal direction of the steel reinforcement 110 and has both ends protruding by a certain length;
It consists of a filler 130 filled inside the steel reinforcement 110,
A compressed precast reinforcement body attached to a steel beam, characterized in that it is reinforced by being attached to the longitudinal center of the upper surface of the upper flange 210 of the steel beam 20 in the longitudinal direction. In claim 1,
The steel reinforcement 110 is a steel beam-attached compressed precast reinforcement body, characterized in that a pair of plates 111 are spaced apart at a certain distance. In claim 2,
The plate 111 of the steel reinforcement 110 is a steel beam-attached compressed precast reinforcement body, characterized in that the upper reinforcement part 112 is formed extending in the horizontal direction to the inside or outside facing the upper end. In claim 2 or claim 3,
The plate 111 of the steel reinforcement 110 is a steel beam-attached compressed precast reinforcement body, characterized in that the lower reinforcement part 113 is formed at the lower end extending in the inner or outer horizontal direction. In claim 2,
A compressed precast reinforcement body attached to a steel beam, characterized in that the upper or lower end of a pair of plates 111 is formed with a connection portion 117 so as to be integrally connected and has an n-type or u-type cross section. In claim 1,
The steel reinforcement 110 is a steel beam-attached compressed precast reinforcement body, characterized in that it has a square cross-section with an empty interior.

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