KR101396440B1 - Hybrid beam with reinforced end portions - Google Patents

Abstract

The present invention relates to a hybrid beam which has an end part, which is reinforced with reinforced concrete, which adheres to the reinforced concrete or a reinforced concrete column and, more specifically, to a prestressed end-reinforced hybrid beam capable of continuing the beam by reinforcing at least end part of an H-shaped structural steel main body with reinforced concrete and inducing a prestress in a reinforced concrete reinforcement part by a post tension method. The prestressed end-reinforced hybrid beam according to an embodiment of the present invention includes: the H-shaped structural steel main body which comprises an upper flange, a lower flange which is parallel to the upper flange at an interval, and a length material in which a web connecting the upper and lower flanges forms an H-shaped cross section shape by being arranged to be vertical to the upper and lower flanges; an end reinforcing concrete which reinforces the cross section of both end parts of the H-shaped structural steel main body by being formed to surround the H-shaped structural steel main body in a predetermined section of both end parts of the H-shaped structural steel main body; and a sheath tube which is symmetrical to the upper part of the web of the H-shaped structural steel main body in the both upper sides of the cross section of the end reinforcing concrete, penetrates the end reinforcing concrete by being laid in the longitudinal direction of the H-shaped structural steel main body in parallel, and enables a PS strand to be inserted inside.

Description

Hybrid beam with reinforced end portions.

The present invention relates to a composite beam having an end portion reinforced by a reinforced concrete reinforced concrete or steel reinforced concrete column, more particularly, at least an end portion of the reinforced concrete reinforced concrete reinforced concrete portion is reinforced by reinforcing concrete, And a prestressed end reinforced composite beam capable of continuing the beam by introducing a prestress in a tensioning manner.

Structures can be divided into materials according to materials such as wooden, brick, steel, reinforced concrete, and steel reinforced concrete. In actual buildings, more than two types of structures or materials are often used together. When two or more materials are used together in the same member, a composite structure is used. In the case where different materials are used for different parts of a building, It is called a mixed structure. In a steel frame, a reinforced concrete frame, and a steel reinforced concrete frame, a skeleton structure is formed by joining a column and a beam. In this case, a rigid frame is often used in which the column and the beam are in contact with each other to resist the flexural stiffness of the member against the horizontal load.

When the column and beam are touched in this way, the bending moment generated by the load is maximized at both ends and is 50 to 60% of the bending moment generated at both ends in the central portion. In the past, the beam cross section corresponding to the maximum bending moment generated at both ends of the beam was applied over the entire beam length when designing the beam. When the beam is designed with the maximum bending moment, the beam is wasted because the beam has a larger cross-section than the central portion, which is uneconomical and inefficient. In order to solve these problems, there is a method of changing the overall shape of the beam in the longitudinal direction, a method of changing the cross-section in the longitudinal direction, and a method of utilizing the characteristics of each material by using different materials, .

As a background of the present invention, there is a Patent Registration No. 10-0585581 'Compound Structure System' (Patent Document 1). This patent relates to a composite structure composed of a reinforced concrete column and a steel beam, in which a formwork is installed to form a protrusion in the horizontal direction of the reinforced concrete column, a steel beam is installed at a predetermined distance, After the installation, concrete is poured and cured to improve the strength of the joint. This composite structure proposed in this patent has a structure in which a connecting member is installed at a predetermined position and then a connecting member and a steel beam are coupled to each other by a joining member and then a concrete is laid to secure the rigidity by simultaneously utilizing the advantages of the reinforced concrete column and the steel beam However, it has disadvantages such as lengthening of air in curing and curing of concrete in site and waste generation in large quantity.

Patent Registration No. 10-0585581 'Composite Structure System'

Disclosure of Invention Technical Problem [7] The present invention has been made in order to solve the problems of the prior art described above. Compared with a reinforced concrete structure, the present invention can produce a member at a factory, The present invention aims to propose an environmentally friendly method in which the amount of water is greatly reduced.

Another object of the present invention is to provide a composite beam capable of reducing the cost by composing the reinforced concrete structure with the reinforced concrete structure while maintaining the same large-diameter gap as the steel structure.

The prestressed end reinforcement composite according to an embodiment of the present invention is composed of an upper flange, a lower flange parallel to and spaced from the upper flange, and a web vertically disposed on the upper and lower flanges and connecting them, An H-shaped steel main body; An end portion reinforced concrete which is formed so as to surround the H-shaped steel main body at a predetermined section of both ends of the H-shaped steel main body and reinforces the end faces of both ends of the H-shaped steel main body; And a sheath pipe which is symmetrical to the upper portion of the web of the H-shaped steel main body and is embedded in parallel to the longitudinal direction of the H-shaped steel main body at both sides of the end section reinforced concrete cross-section so as to penetrate the end reinforced concrete and into which the PS strand can be inserted .

At this time, a plurality of connection holes are formed in the upper portion of the web of a predetermined section of both ends of the H-shaped steel main body at regular intervals along the longitudinal direction of the H-shaped steel main body, and the respective connection holes are connected to a sheath pipe A sheath pipe is seated in the groove of the sheath pipe connecting member, and a cross-sectional reinforcing steel pipe passing through the holes of the sheath pipe connecting member can be further installed along the longitudinal direction of the H-shaped steel material body.

In addition, a plurality of stiffeners may be provided between the upper flange and the lower flange at a predetermined interval in a direction perpendicular to the web, in order to prevent buckling of the flange or the web.

The U-shaped reinforcing bars are partially embedded in the upper surface of the end-portion reinforced concrete and exposed to the upper portion of the reinforced concrete. The end portions of the end portions of the H-shaped steel main body, Can be bonded to exposed U-shaped bars.

In addition, it further comprises a lower reinforced concrete formed so as to surround the lower flange of the H-shaped steel main body in order to reinforce the lower portion of the H-shaped steel main body in the section between the both end reinforced concrete, and both end reinforced concrete and the lower reinforced concrete are provided with both end reinforcement The prestress can be introduced in a pre-tensioned manner by a single prestressed strand embedded in the concrete and the lower reinforced concrete.

In addition, the PS stranded wire is extended in a downwardly inclined manner toward the central portion of the both end-end reinforced concrete, and is embedded in the lower reinforced concrete at a central portion thereof in a symmetrical manner under the web of the H-shaped steel main body and buried in parallel to the longitudinal direction of the H- After the composite beam is mounted on the column, the PS strand is strained and the prestress can be introduced to the both end reinforced concrete and the lower reinforced concrete by the post tension method.

The end reinforcing steel frame according to the present invention has excellent bondability with the reinforced concrete column or the steel reinforced concrete column, and it is possible to ensure the uniform quality of the member by making full use of the factory production of the member and to reduce the weight of the building.

In addition, compared with the steel structure, it maintains the same level of large diameter, but also has the effect of cost reduction by combining with reinforced concrete structure.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention, Shall not be construed as limiting.
FIG. 1A is a perspective view of a prestressed end reinforced composite beam according to an embodiment of the present invention. FIG.
1B is a cross-sectional view showing an end portion of the prestressed end reinforced composite beam shown in FIG. 1A.
Fig. 1C is a cross-sectional view showing a center portion of the prestressed end reinforced composite beam shown in Fig. 1A.
Fig. 1D is an important part perspective view of a modification of the end portion of the prestressed end reinforced composite beam shown in Fig. 1A.
Fig. 1E is a cross-sectional view showing a modified example of the end portion of the prestressed end reinforced composite beam shown in Fig. 1A.
FIG. 1F is a perspective view showing a frame using the prestressed end reinforced composite beam shown in FIG. 1A.
2A is a perspective view of a composite prestressed end reinforced beam according to another embodiment of the present invention.
FIG. 2B is a cross-sectional view showing an end portion of the prestressed end reinforced composite beam shown in FIG. 2A.
2C is a cross-sectional view showing a modification of the end portion of the prestressed end reinforced composite beam shown in FIG. 2A.
FIG. 2D is a cross-sectional view illustrating a center portion of the prestressed end reinforced composite beam shown in FIG. 2A.
FIG. 2E is a perspective view showing the frame using the prestressed end reinforced composite beam shown in FIG. 2A. FIG.
3A is a perspective view of a prestressed end reinforced composite beam according to another embodiment of the present invention.
FIG. 3B is a cross-sectional view showing an end portion of the prestressed end reinforced composite beam shown in FIG. 3A.
3C is a cross-sectional view showing a modified example of an end portion of the prestressed end reinforced composite beam shown in FIG. 3A.
FIG. 3D is a cross-sectional view showing a central portion of the prestress end reinforced composite beam shown in FIG. 3A.
FIG. 3E is a perspective view showing the frame using the prestressed end reinforced composite beam shown in FIG. 3A. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto.

[First Embodiment]

FIG. 1B is a cross-sectional view showing an end portion of the prestressed end reinforced composite beam shown in FIG. 1A, and FIG. 1C is a cross-sectional view of the prestressed end reinforced composite beam shown in FIG. Fig. 1D is an important partial perspective view of a modified example of the end portion of the prestressed end reinforced composite beam shown in Fig. 1A, Fig. 1E is a cross-sectional view showing a prestressed end reinforced composite beam Fig. 1F is a perspective view showing a frame using the composite prestressed end reinforced beam shown in Fig. 1A; Fig.

The prestressed end portion reinforced composite according to the first embodiment of the present invention includes an H-shaped steel main body 10 having a constant cross section and a length, an end portion reinforced concrete 20a reinforcing both ends of the H-shaped steel main body, And a sheath tube 30a embedded in the sheath tube 30a.

The H-shaped steel main body 10 has an upper flange 11, a lower flange 12 parallel to and spaced from the upper flange 11, a web 13 disposed perpendicularly to the upper and lower flanges 11, May be a prefabricated product manufactured by the rolling process and may be a built-up product prepared by separately preparing these members and welding them.

The H-shaped steel main body 10 according to the present invention has an H-shaped body 10 and a H-shaped steel body 10 according to the present invention, It is preferable that the H-shaped roll beam which is rolled and cast into a cross section is used to ensure ease of fabrication and economical efficiency.

The cross section of the H-shaped steel main body 10 can be selected in accordance with the calculation of the midpoint moment. A plurality of stiffeners 14 (in the direction perpendicular to the web 13) are provided between the upper flange 11 and the lower flange 12 at the center in the longitudinal direction of the H-shaped steel body 10 to prevent buckling of the flanges or webs. ) Can be installed at regular intervals.

The end-portion reinforced concrete 20a is laid so as to surround the H-shaped steel main body 10 at certain intervals at both ends of the H-shaped steel main body 10. The cross-sectional size and the length of the inserted portion of the end- Can be determined by structural calculation according to the magnitude of the momentum occurring at the end of the optical fiber 10.

Therefore, according to the present embodiment, the end section of the H-shaped steel main body 10 is selected with respect to the center section moment smaller than the end portion moment, and the end reinforcing concrete 20a and the H Shaped steel main body 10 are integrated to increase the cross-sectional area, thereby enabling economical and efficient designing of the overall beam length.

The end-portion reinforced concrete 20a may be formed by a field casting method, but is preferably formed by a precast method. That is, the end reinforced concrete is cured at the factory in a certain section requiring reinforcement of the end side of the H-shaped steel main body 10, so that the uniform quality of the members can be secured by making full use of the factory production, have.

The end portion reinforcing concrete 20a may further be provided at the upper portion thereof with an end vicinity face 21 resisting the end parenting force parallel to the longitudinal direction of the H-shaped steel body 10, 20a and the remaining portion is exposed to the upper portion of the end portion reinforced concrete 20a by welding or the like.

The sheath pipe 30a is embedded in the end portion reinforced concrete 20a in parallel to the longitudinal direction of the H-shaped steel body 10 and penetrates through the end portion reinforced concrete 20a. That is, symmetrical to the upper portion of the web 13 of the H-shaped steel body 10. A PS strand can be inserted into the sheath tube 30a, and a PS strand can be tensioned by a known method to introduce a prestress into the end reinforced concrete 20a in a post tension manner. The fusing plate 31 may be installed on one side of the end portion reinforced concrete 20a where the sheath pipe 30a is exposed and the fusing plate 31 may be formed from the stress concentrated on the end portion reinforced concrete 20a after the PS strand tension, (20a).

On the other hand, as shown in Figs. 1D to 1E, the end reinforced concrete 20a can flow over the web 13 at a predetermined section of both ends of the H-shaped steel body 10 and can penetrate the sheath pipe connecting member 15 The connecting holes 131 may be perforated at regular intervals along the longitudinal direction of the H-shaped steel body 10. A sheath pipe connecting member 15 is disposed in the connecting hole 131 so as to pass through the connecting hole 131 so that the sheath pipe connecting member 15 and the web 13 of the H-shaped steel main body are joined by welding or the like. A groove 151 according to the shape of the sheath pipe 30 is formed on the upper portion of the sheath pipe connecting member 15 to facilitate the placement and fixing of the sheath pipe 30 before the end reinforced concrete 20a is installed desirable.

The sheath pipe connecting member 15, which is connected to the end portion reinforced concrete 20a flowing through the connection hole 131 through the connection hole and is embedded in the end reinforced concrete, serves to increase the shear strength of the concrete. That is, the sheath pipe connecting member 15 serves as a shear connection member and at the same time prevents the sheath pipe 30 from moving before the sheath pipe 30 is embedded in the concrete.

The reinforcing bars 152 are formed in the sheath pipe connecting member 15 so that the reinforcing rods 16 penetrate through the holes 152 of the sheath pipe connecting member 15 to form the H- It is possible to further reinforce the end faces of both ends by arranging them in the longitudinal direction.

As shown in FIG. 1F, when the composite beams according to the present embodiment are installed on both sides of the column 100, the sheath pipes of both composite beams are provided so as to communicate with each other so that the PS strands are continuously passed through the composite beams of both sides of the column desirable. Accordingly, it is possible to increase the ductility of the column 100 and the composite beam connection part, and it is possible to reduce the end-side area 21 compared to the conventional composite beam.

[Second Embodiment]

FIG. 2B is a cross-sectional view illustrating an end portion of the prestressed end reinforced composite beam shown in FIG. 2A, and FIG. 2C is a cross-sectional view of the prestressed end reinforced composite beam shown in FIG. Fig. 2D is a cross-sectional view showing a center portion of the prestressed end reinforced composite beam shown in Fig. 2A, Fig. 2E is a cross-sectional view showing a prestressed end reinforced composite beam shown in Fig. 2A, And FIG.

The prestressed end reinforcing composite according to the second embodiment of the present invention includes an H-shaped steel main body 10 having a predetermined cross section and a length, an end reinforced concrete 20a reinforcing both ends of the H-shaped steel main body 10, A sheath pipe 30a embedded in the end portion reinforced concrete 20a and a lower reinforced concrete 20b formed between the end portions reinforced concrete 20a and reinforcing the lower portion of the H-shaped steel main body 10.

The configuration of the prestressed end reinforced composite beam according to the second embodiment of the present invention is the same as that of the first embodiment described above except for the lower reinforced concrete 20b, and thus a repeated description thereof will be omitted.

The lower reinforced concrete 20b is formed so as to surround the lower flange 12 of the H-shaped steel main body 10 in the interval between the end reinforced concrete 20a and can be integrally cast and cured simultaneously with the end reinforced concrete 20a . The installation and curing process can make the best use of the factory production, ensuring the uniform quality of the members and reducing the air in the field.

The prestressed strand 23 is embedded in the lower portion of the section of the end reinforced concrete 20a and the lower reinforced concrete 20b in parallel to the longitudinal direction of the H-shaped steel body 10 as shown in Figs. 2B to 2D, . That is, before the end reinforced concrete 20a and the bottom reinforced concrete 20b are installed in the factory, the prestressed strand 23 given a pre-tension by an arbitrary method is inserted into the end reinforced concrete 20a and the lower reinforced concrete 20b, And then pretensioned at the lower end of the composite beam by loosening it in any way. This offset the deflection caused by the construction load and working load and has an advantageous effect on the usability such as vibration compared to the steel frame.

[Third Embodiment]

FIG. 3A is a perspective view of a prestressed end reinforced composite beam according to another embodiment of the present invention, FIG. 3B is a cross-sectional view illustrating an end portion of the prestressed end reinforced composite beam shown in FIG. 3A is a cross-sectional view showing a central portion of the prestressed end reinforced composite beam shown in Fig. 3A, Fig. 3E is a cross-sectional view showing a prestressed end reinforcement Fig. 2 is a perspective view showing a frame using a composite beam.

The prestressed end reinforced composite according to the third embodiment of the present invention includes an H-shaped steel main body 10 having a predetermined cross-section and a length, an end reinforced concrete 20a reinforcing both ends of the H-shaped steel main body, A lower reinforced concrete 20b reinforcing a lower portion of the H-shaped steel main body 10 between the concrete 20a and a sheath pipe 30b embedded in the end reinforced concrete 20a and the lower reinforcing cave 20b do.

The configuration of the prestressed end reinforced composite beam according to the third embodiment of the present invention is the same as that of the second embodiment described above except for the buried position of the sheath pipe 30b, and thus repeated explanation will be omitted.

Although the sheath pipe 30a is embedded in the end reinforced concrete 20a in the first and second embodiments, the sheath pipe 30b of the third embodiment of the present invention is not limited to the end reinforced concrete 20a as well as the lower reinforced concrete 20b To be buried. 3, the sheath pipe 30b is symmetrical to the upper side of the web 13 of the H-shaped steel body 10 on both sides of the upper end of the end face of the end reinforced concrete 20a and the length of the H-shaped steel body 10 Shaped steel body 10 and the lower reinforced concrete 20b are symmetrical to the lower portion of the web 13 of the H-shaped steel body 10 and the length of the H-shaped steel body 10 Direction so as to be embedded in parallel. In other words, it is preferable that the arrangement of the sheath tube 30b follows the shape of the moment diagram of the continuous beam.

3D, in the case of a continuous span in which the beams 100 are arranged at regular intervals and the beams disposed between the columns 100 are continuous, the sheath pipe 30b of both composite beams is pivoted about the column 100 It is preferable that the PS strands are inserted into the sheath tube 30b so as to connect the continuous beams successively and are stretched by any known method.

This makes it possible to increase the ductility of the joint by tightening the connection between the continuous beam and the column under the continuous span condition, and it is also possible to introduce a tension force in both the moment and the moment moments.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the above teachings. will be. The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

10: H-shaped steel main body 11: upper flange
12: lower flange 13: web of steel beam
131: Connection hole 14: Stiffener
15: sheath tube connecting member 151: sheath tube connecting member groove
152: Sheath pipe connecting member hole 16:
20a: End-portion reinforced concrete 21: Near end portion
22: U-shaped reinforcing bar 20b: Lower reinforced concrete
23: Prestressed strand 30: Sheath tube
31: Fusing plate 100: Column

Claims (6)

A lower flange 12 spaced apart from the upper flange 11 by a distance from the upper flange 11 and a web 13 vertically disposed on the upper and lower flanges 11 and 12 and connecting them to each other, An H-shaped steel main body 10 made of ash;
An end reinforcing concrete 20a which is formed so as to surround the H-shaped steel main body 10 at a predetermined interval at both ends of the H-shaped steel main body 10 and reinforces the end faces of both ends of the H-shaped steel main body;
The end portion reinforced concrete 20a is symmetrical to the upper portion of the web 13 of the H-shaped steel body at both sides of the upper surface of the cross section and is embedded in parallel to the longitudinal direction of the H-shaped steel body 10, passes through the end reinforced concrete 20a, And a sheath pipe (30a) into which a stranded wire can be inserted,
A plurality of connection holes 131 are formed in a predetermined interval along the longitudinal direction of the H-shaped steel body 10 at the upper portion of the web 13 at a predetermined section of both ends of the H-shaped steel main body 10, And a sheath pipe 30 is seated on the groove 151 of the sheath pipe connecting member 15 so that the sheath pipe connecting member 15 is inserted into the groove 151 of the sheath pipe connecting member 15 And the end reinforcing rods (16) passing through the holes (152) of the sheath pipe connecting member (15) are provided along the longitudinal direction of the H - shaped steel body (10). delete The method according to claim 1,
A plurality of stiffeners 14 are disposed at a central portion of the H-shaped steel body 10 at a predetermined interval between the upper flange 11 and the lower flange 12 in order to prevent buckling of the flanges or webs Wherein the reinforcing fiber reinforced by the prestress reinforced end is reinforced. The method according to claim 1,
Shaped reinforcement 22 is partially formed on the upper surface of the end portion reinforced concrete 20a and exposed to the upper portion of the end portion reinforced concrete 20a so as to extend in the longitudinal direction of the H- Characterized in that the end zone (21) near the end of the end reinforcing concrete (20a) is joined to the U-shaped reinforcing bar (22) exposed to the top of the end reinforcing concrete (20a). The method according to claim 1,
Further comprising a lower reinforcing concrete (20b) formed so as to surround the lower flange (12) of the H-shaped steel body (10) to reinforce the lower portion of the H-shaped steel body (10) in a section between the both end reinforced concrete ,
A prestressed prestress is introduced into both the end reinforced concrete 20a and the lower reinforced concrete 20a by a single prestressed strand 23 embedded through the both end reinforced concrete 20a and the lower reinforced concrete 20a, Wherein the reinforcing fiber reinforced by the prestressed reinforced end reinforcement is made of a synthetic resin. 6. The method of claim 5,
The PS stranded wires extend downward from the both end reinforced concrete 20a to the central portion side and are symmetrical to the lower side of the web 13 of the H-shaped steel main body 10 inside the lower reinforced concrete 20b at a certain middle portion, The composite beam is mounted on the column 100 and then the PS stranded wire is tensed so that the both ends reinforced concrete 20a and the lower reinforcement 20b are inserted in the post- And a prestress is introduced into the concrete (20b).

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