KR20220157046A - Composite beam composed of complex structure - Google Patents

Abstract

The present invention relates to a composite beam structure of a building in which a reinforced concrete floor slab and a steel beam are combined. The composite beam structure comprises a box-shaped forming beam in the center and H-shaped steel beams positioned on both ends of the forming beam, wherein the box-shaped forming beam comprises a lower plate, side plates vertically formed on both sides of the lower plate, and an upper plate connecting the tops of the both side plates, so that a closed square cross-section is formed. Moreover, openings are formed at regular intervals on the upper plate, and the thickness of the upper plate is greater than the thickness of the lower plate. According to the present invention, structural stability against construction load can be secured, and the amount of steel and members used can be reduced.

Description

Composite composite beam structure {COMPOSITE BEAM COMPOSED OF COMPLEX STRUCTURE}

The present invention relates to a reinforcing structure of a building, and more specifically, to a reinforced concrete floor slab and a steel member installed between pillars of a building to maximize load resistance by using the advantages of steel and concrete. It relates to the structure of a composite beam in which beams are synthesized.

Concrete is weak against tensile force, but has high stiffness against compressive force. On the other hand, steel materials are easily buckled under compressive forces, but are very strong against tensile forces. The composite structure is to overcome the relative weakness while demonstrating the above-mentioned advantages of concrete and steel to have high stiffness as a whole, and the most widely used is a composite beam as a reinforcing structure.

The composite beam can be largely divided into a structure in which H-beams are synthesized into slab concrete and a structure in which a box-shaped outer shell with an open top is formed with a steel plate and filled with concrete therein.

However, in the former H-beam composite beam structure, the web is located in the center of the beam structure, and even though the bending moment acting on the beam structure changes in the opposite direction depending on the position, the beam structure has a uniform cross-sectional shape, is overused and uneconomical. In addition, the H-beam composite beam structure has the disadvantage of being vulnerable to torsion. Therefore, as shown in Figure 1, it is common to install a buckling bracing for beam stability, but this has a problem of increasing the amount of work in the field, as well as increasing the amount of steel used and reducing the available space in the room.

In addition, since the latter box-type composite beam structure uses thin steel plates, local buckling occurs during the construction process when the span is large or the slab has a heavy weight. More specifically, bending-compression buckling occurs in the upper plate at the center due to the construction load, and shear buckling occurs in the web portion at the end.

Therefore, in the box-type composite beam structure, it is common to install a support under the beam structure in order to prevent the beam structure from being deformed as described above during construction, but this acts as a factor hindering the rapid progress of the construction.

Moreover, the box-type composite beam structure has a problem in that the beam-column junction becomes very complicated because all four sides must be joined to the column.

Accordingly, the inventor of the present application has proposed a prestressed concrete filled steel pipe composite beam in Registered Patent Publication No. 10-1136926 in order to solve the above problems of the box-type composite beam structure and the problems of the conventional prestressed concrete beam.

The composite beam of registration number 10-1136926, as shown in Figure 2, is a longitudinal member of the beam, a box-shaped steel pipe 11 with a concrete filling hole 11a formed on the upper surface; End plates 12 installed by attaching to both ends of the box-shaped steel pipe 11; A penetration support rod 13 installed to pass through the box-shaped steel pipe 11 in the width direction of the box-shaped steel pipe 11 in the middle of the longitudinal direction of the box-shaped steel pipe 11; Inside the box-shaped steel pipe 11, it is placed under or over the through-support bar 130 along the longitudinal direction of the box-shaped steel pipe 11 and installed under tension. A first strand 14a supported and fixedly installed at both ends to the end plate 12; And, filled concrete (15) filled through the concrete filling hole (11a) of the box-shaped steel pipe (11) to bury the first steel wire (14a); the box-shaped steel pipe (11) is one The steel plate is bent to make the upper and lower plates have the same thickness, and both ends are connected to the column (C) through the H-beam or the connection bracket 16 of the box body.

That is, the composite beam of Registration No. 10-1136926 simply uses the end plate 12 as a medium to overcome the difference in shape between the box-shaped cross section and the H-shaped cross section when connecting the box-shaped steel pipe 11 with the connecting bracket 16. , In the connection bracket 16 part of the H-beam, a separate shear connector such as a stud is required for the synthesis of the slab.

In addition, between the box-shaped steel pipe 11 and the end plate 12 and between the H-shaped steel connection bracket 16 and the end plate 12 are all welded in a T-shape, so that the box-shaped steel pipe 11 and the end plate (12) has a problem in that a lamellar tearing phenomenon in which fine cracks occur due to the occurrence of restraining stress inside the steel sheet due to local thermal deformation of the heat-affected zone.

Moreover, the composite beam of Registration No. 10-1136926 has the above-described general box-type composite beam structure in which the upper plate is composed of a thin steel plate and is vulnerable to compressive force, and the central portion of the upper plate is flexurally compressed due to the construction load.

KR 10-1136926 B1

The present invention is to solve and improve the problems that have occurred in the prior art and the prior art of the present applicant, by appropriately changing the cross section of the reinforcing structure and efficiently transferring stress, thereby reducing structural damage to the construction load. Its purpose is to provide a composite composite beam structure that secures stability, improves economics and constructability by reducing the amount of steel and members used, and ensures the maximum safety of building users in the event of a disaster such as an earthquake.

According to the most preferred embodiment of the present invention for solving the above problems, as a supplementary structure of a building composed of a central box-shaped beam and H-beams located at both ends of the forming beam, the box-shaped forming beam and the lower plate It is composed of side plates formed vertically on both sides of the lower plate and an upper plate connecting the upper ends of the side plates on both sides to form a closed rectangular cross section, and openings are formed at regular intervals in the upper plate, and the thickness of the upper plate is thicker than that of the lower plate. A composite composite beam structure is provided.

At this time, the box-shaped forming beam may be made of a structure having an extension part protruding more horizontally than the side plate and the upper plate on the lower plate so that the lower flange end of the H-beam is mounted on the extension part. In addition, a plurality of shear buckling reinforcement plates may be installed inside the box-shaped forming beam.

In another embodiment of the present invention, a stress transmission plate is installed between the box-shaped forming beam and the H-shaped steel beam so that the box-shaped forming beam and the H-shaped steel beam are interconnected through this.

At this time, the upper end of the stress transmission plate may be configured to protrude upward more than the upper plate of the box-shaped forming beam and the upper flange of the H-shaped steel beam, and the bearing surface of the slab reinforcing bar may be formed on some of the upper ends of the stress transmission plate. .

In addition, in another embodiment of the present invention, the composite beam structure can be configured so that the upper flange of the H-beam is located above the upper plate of the box-shaped beam, and the lower flange of the H-beam is the same as the lower plate of the box-shaped beam. While positioned at a height, it is possible to form a deck cradle protruding from the side plate on the lower plate of the box-shaped forming beam.

The present invention combines the H-beam composite beam structure and the box-type composite beam structure through a stress transmission plate, thereby enabling economic feasibility, workability, and structural stability through the following operational effects.

First, by combining H-beams and box-shaped beams, the amount of steel used is reduced while reinforcing the ends, torsion deformation is prevented, the connection with the column is simplified, and the seismic energy absorption capacity, not the connection area with the column, is increased when an earthquake occurs. Prevent sudden destruction of the building by making the destruction occur in the large central box-shaped beam.

Second, since shear buckling is prevented by the web at the end and extrusion buckling is prevented by the thick top plate at the center, independence in response to the construction load is improved, making the use of shore unnecessary.

Third, the composite force between the H-beam and the slab concrete is increased by the action of the stress transmission plate, and the stiffness against bending and torsion of the H-beam is increased, making it unnecessary to install shear connectors such as studs and bracing for beam stabilization.

Fourth, the joint connection between the box-shaped and H-shaped steel beams is reinforced by the extension provided on the lower plate of the box-shaped beam, so that the flow of stress is made naturally, and welding for the coupling between them is T Since it can be done by mock welding rather than mold welding, welding can be performed easily, and lamella tearing, which tends to occur during welding, is prevented.

1 is a perspective view of a general H-beam composite beam structure.
2 is a perspective view of a composite beam and a cross-sectional view of a structure in which it is installed according to the prior art of the present applicant,
3 is a perspective view of a structure in which a composite beam structure according to an embodiment of the present invention is installed.
4 is a side view, a plan view, and a bottom view of the composite beam structure according to the embodiment of FIG. 3;
FIG. 5 is a cross-sectional view of each part of AA, BB, CC, and DD of FIG. 4 .
6 is a longitudinal cross-sectional view of a state in which a stress transmission plate according to an embodiment is installed in a composite beam structure.
7 is an explanatory view of the working relationship of the stress transmission plate.
8 is each cross-sectional view of a structure in which a composite beam structure according to another embodiment of the present invention is installed.
9 is a cross-sectional view of the box-shaped forming beam of the present invention equipped with a deck cradle.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in the description of the present invention, when the technical idea of the present invention is blurred or unclear due to the detailed description of the known configuration, the description of the configuration of the above known will be omitted.

The composite beam structure of the present invention has a composite composite beam structure in which an H-beam composite beam structure and a box-type composite beam structure are applied in a complex manner so that the amount of steel used can be minimized while appropriately responding to the stress structure acting thereon.

Figures 3 to 5 show the composite beam structure according to an embodiment of the present invention, Figure 3 shows it as a whole, Figure 4 shows the side, plane and bottom surface thereof, respectively, Figure 5 is a diagram Sections of A-A, B-B, C-C, and D-D of Fig. 4 are each shown.

As shown in FIG. 3, in the composite beam structure of the present invention, the box-shaped forming beam 100 is located in the section where the central positive moment acts, and the section where the negative moments of both ends of the box-shaped forming beam 100 act. Has a structure in which the H-beam 200 provided with the upper and lower flanges 210 and 220 and the web 230 is located.

That is, each H-shaped steel beam 200 located at both ends of the box-shaped forming beam 100 is jointly connected with the box-shaped forming beam 100 at a point of L/5 to L/4 length of the span. Accordingly, the shear buckling load acting on the end of the composite beam structure due to the construction load is supported by the web 230 of the H-shaped steel beam 200 thicker than the steel plate of the box-shaped forming beam 100, thereby preventing the occurrence of deformation.

The box-shaped beam 100 is composed of a lower plate 110, side plates 120 vertically upwardly formed on both sides of the lower plate 110, and upper plates 130 connecting the upper ends of the side plates 120 on both sides, It has a closed rectangular cross section as shown in (d) of FIG. Among them, the top plate 130 is configured to have openings 131 formed at regular intervals. The opening 131 functions as a pouring passage for the concrete poured therein, and allows it to have integrity with the slab concrete 500 above it.

In addition, a plurality of shear buckling reinforcement plates 140 may be further installed inside the box-shaped forming beam 100. The shear buckling reinforcement plates 140 may be installed at regular intervals, but may have closer intervals from the center to the ends according to the change in stress acting thereon.

The box-shaped beam 100 in the present invention, in particular, configures the thickness of the upper plate 130 to be thicker than the thickness of the lower plate 110, which is caused by the bending-compression buckling load acting on the center of the composite beam structure due to the construction load This is to prevent deformation of the upper plate 130.

In this way, the composite beam structure of the present invention is prevented from shear buckling by the thick web 230 of the H-shaped steel beam 200 at the end against the construction load during the construction process, and at the center by the thick top plate 130 Flexural compression buckling As this is prevented, self-reliance is increased, making it possible to omit the installation of temporary members such as shoring at the lower part.

In another embodiment of the box-shaped forming beam 100 in the present invention, as shown in (c) of FIG. It is configured so that the protruding extension part 111 is formed.

The extension part 111 only facilitates the welding work for integration between the box-shaped forming beam 100 and the H-shaped steel beam 200 by allowing the end of the lower flange 220 of the H-shaped steel beam 200 to be mounted. Rather, the occurrence of the above-described lamella tearing phenomenon is prevented by making rough welding performed between them.

In addition, the extension part 111 has the effect of structurally reinforcing the joint connection between the H-shaped steel beam 200 and the box-shaped forming beam 100 by relieving the concentration of stress due to the change in the short side of the composite beam structure.

A stress transfer plate 300 may be further installed in the joint connection portion. As a result, the composite beam structure of the present invention has a structure in which the box-shaped forming beam 100 and the H-shaped steel beam 200 are interconnected through the stress transmission plate 300.

FIG. 6 shows cross-sections of an embodiment for explaining the configuration of the stress transmission plate 300, and FIG. 7 illustrates a function of the stress transmission plate 300 as a drawing.

The stress transfer plate 300 blocks the end of the box-shaped forming beam 100 to prevent the outflow of concrete poured therein, along with a formwork function and a bracket function to facilitate joint connection with the H-beam 200. also do

However, the more important thing in the stress transmission plate 300 is the function of transmitting the tensile stress generated in the upper reinforcing bar 520 of the slab to the H-beam 200 and the reinforcing function for the bending torsion resistance of the H-beam 200 is that it has

For this purpose, the stress transmission plate 300 of the present invention is configured so that the upper end protrudes more upward than the upper plate 130 of the box-shaped forming beam 100 and the upper flange 210 of the H-beam 200, so that the upper end is concrete. As it is embedded in, it is structurally connected to the upper reinforcing bar 520 of the slab. At this time, in order to reduce the use of spacers while facilitating the reinforcement work for the upper reinforcing bars 520 of the slab, a portion of the upper end of the stress transmission plate 300 may be provided with a slab reinforcing surface 310, FIG. (b) of (b) shows one of its embodiments.

The action of the stress transmission plate 300 will be described in detail with reference to FIG. 7 .

As a part rigidly coupled with the column 400, a moment is applied to the end of the T-beam (a cross-sectional beam in which the composite beam structure of the present invention and the slab concrete 500 are combined) synthesized with the slab concrete 500, and , As a result, a tensile force is generated in the slab concrete 500, and the tensile force is supported by the upper reinforcing bars 520 reinforced therein.

Accordingly, as described in (a) of FIG. 7, tensile stress is generated in the upper reinforcing bar 520, and the tensile stress is again mediated by the slab concrete 500, and the stress buried therein The acupressure force acts on the transmission plate 300. At this time, the stress transmission plate 300 distributes and transmits the above-mentioned pressure force to the front surface of the H-beam 200, thereby increasing the H-beam 200 against the moment greatly occurring at the end of the slab concrete 500. The shear surface of the can be stably resisted.

Due to the above-described action of the stress transmission plate 300, as will be described later, when the upper flange 210 of the H-shaped steel beam 200 is positioned above the upper plate 130 of the box-shaped forming beam 100, the end of the slab It is also possible to omit the upper reinforcing bar 520 itself in .

In addition, since the upper part of the stress transfer plate 300 embedded in the slab concrete 500 as described above functions as a shear connector for synthesizing the H-beam 200 with the slab concrete 500, the H-beam It is also possible to minimize or eliminate the number of studs typically installed on the upper flange 210 of 200.

In addition, the stress transmission plate 300 acts as a reinforcing means for preventing bending and twisting of the H-shaped steel beam 200 together with the box-shaped forming beam 100, making it unnecessary to install buckling braces for beam stability . That is, as described in (b) of FIG. 7, the upper part of the stress transmission plate 300 embedded in the slab concrete 500 uses the reaction force of the slab concrete 500 to form the stress transmission plate 300. ) so that the H-beam 200 bonded to it can resist twisting.

8 is a diagram showing another embodiment of the composite beam structure of the present invention.

The H-shaped steel beam 200 located at the end of the composite beam structure is buried in the slab concrete 500 by placing the upper flange 210 above the top plate 130 of the box-shaped forming beam 100, thereby forming the upper flange As described above, slab concrete (500) The reinforcement itself of the upper reinforcing bars 520 to the inside may be omitted.

As a specific method for this configuration, as shown in (a) of FIG. As shown, the H-beam 200 itself can be moved to the top, which takes into account the structural plan considering the construction load acting on the composite beam structure during the construction process and the working load of the T-beam that has been built and the workability according to the site conditions. so you can do it selectively.

For example, as will be described later, when the deck plate 510 is mounted on the lower flange 220 of the H-beam 200 to implement a slim floor, the latter structure may be advantageously selected.

On the other hand, it is possible to implement a slim floor by installing a deck plate 510 in the composite beam structure of the present invention. To this end, as shown in FIG. The deck cradle 112 may be further formed. At this time, the lower flange 220 of the H-beam 200 corresponds to the deck plate 510 installed on the box-shaped beam 100 installed on the H-beam 200, the lower plate 110 of the box-shaped beam 100 ) and should be configured to be continuous at the same height position.

In the above, the present invention has been described in detail with reference to specific embodiments, but since the above embodiments are merely examples to make the present invention easier to understand, those skilled in the art are within the scope of the technical idea of the present invention. It is obvious that it will be possible to carry out various modifications within. Therefore, it will be said that such modifications fall within the scope of the present invention as described in the claims.

100; Box-shaped molding beam 110; lower plate
111; extension 112; deck stand
120; side plate 130; top plate
131; opening 140; Shear Buckling Reinforced Plate
200; H-beam 210; upper flange
220; Lower flange 230; web
300; stress transfer plate 310; through
400; pillar 500; slab concrete
510; deck plate 520; rebar

Claims (8)

In the reinforcement structure of a building composed of a box-shaped forming beam 100 in the center and H-beams 200 located at both ends of the forming beam,
The box-shaped beam 100 is composed of a lower plate 110, side plates 120 vertically formed on both sides of the lower plate 110, and an upper plate 130 connecting the upper ends of the side plates 120 on both sides, and is closed. It consists of a quadrangular section,
Openings 131 are formed at regular intervals in the top plate 130,
The composite composite beam structure, characterized in that the upper plate (130) is thicker than the lower plate (110). According to claim 1,
The box-shaped forming beam 100 has an extension 111 in which the lower plate 110 protrudes more in the horizontal direction than the side plate 120 and the upper plate 130 so that the end of the lower flange 220 of the H-beam 200 is mounted. A composite composite beam structure characterized in that is formed. According to claim 1,
The box-shaped forming beam 100 and the H-shaped steel beam 200 are interconnected through a stress transmission plate 300, characterized in that composite composite beam structure. According to claim 3,
The stress transmission plate 300 is configured such that the upper end protrudes more upward than the upper plate 130 of the box-shaped forming beam 100 and the upper flange 210 of the H-shaped steel beam 200. Composite composite beam structure. According to claim 4,
A composite composite beam structure, characterized in that the bearing surface 310 of the slab reinforcement is formed on some of the upper ends of the stress transmission plate 300. According to claim 1,
The upper flange 210 of the H-beam 200 is a composite composite beam structure, characterized in that located above the upper plate 130 of the box-shaped forming beam 100. According to claim 6,
The lower flange 220 of the H-beam 200 continues at the same height as the lower plate 110 of the box-shaped beam 100, and the lower plate 110 has a deck holder protruding from the side plate 120 ( 112) is formed, a composite composite beam structure. According to claim 1,
A composite composite beam structure, characterized in that the shear buckling reinforcement plate 140 is installed inside the box-shaped forming beam (100).

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