KR101186062B1 - Connection of concrete filled steel tube column and H-shaped steel beam and constructing method of the same - Google Patents

Abstract

The present invention relates to a joint structure of a concrete-filled steel pipe column filled with concrete in a steel pipe and a steel beam having an H-shaped cross section, and a construction method thereof.
According to a suitable embodiment of the present invention, a concrete filled steel pipe column; Steel beams of which the upper and lower flanges and the web connecting them form an H-shaped cross section; A support member joined to the side of the concrete-filled steel pipe column perpendicular to the longitudinal direction of the column to be bolted to the lower flange of the steel beam; A connecting member disposed above the supporting member and joined to the side of the concrete-filled steel pipe column in the longitudinal direction of the column to be bolted to the web of the steel beam; It has two ends, one end penetrates through the concrete filled steel pipe column and is settled in the concrete filled inside the concrete filled steel pipe column, the other end is welded to the upper flange of the steel beam and the part between the two ends is steel Tensile reinforcement bars spaced apart from the upper flange of the beam; And a reinforced concrete slab integrally synthesized on the upper portion of the steel beam and having a reinforced concrete slab embedded therein, wherein the connection structure between the concrete-filled steel pipe column and the H-shaped steel beam is provided.

Description

Connection of concrete filled steel tube column and H-shaped steel beam and constructing method of the same}

The present invention relates to a joint structure of a concrete-filled steel pipe column filled with concrete in a steel pipe and a steel beam having an H-shaped cross section, and a construction method thereof.

The joint of the steel structure is an important structural element that has a great influence on structural problems such as the behavior of the structure and stress transfer and construction problems such as fabrication and installation. Therefore, stress transfer methods, shape and scale of the building, construction and economic feasibility Consideration should be given.

All joints can be classified as simple joints (shear joints), semi-rigid joints, and rigid joints (moment joints), depending on the characteristics of the member's relative rotational angle with respect to the moment between the connecting members under load or moment.

A simple joint is a joint that requires ductility so that the rotation of the joint can sufficiently rotate with respect to the bending moment, such as the cutting of a simple beam. Such a joint can be designed assuming that it transmits only the shear force without transmitting the bending moment to the column. have.

The semi-rigid joints show the intermediate behavior characteristics of the simple joints with no moment resistance and the strong joints with full moment resistance, thereby reducing the cross-section of the member, making it more economical to design than the steel joints or the simple joints.

On the other hand, the concrete filled steel pipe structure is a structure filled with concrete inside the cross section of the steel pipe, which is a structural system that exhibits excellent rigidity, strength, and deformation performance due to the composite effect of the steel pipe and concrete. It is known to be usable.

However, when joining closed section columns and beams, such as concrete-filled steel pipes, it is common to design them as steel joints, and accordingly, it is necessary to install horizontal stiffeners (diaphragms) inside the steel pipes as shown in FIG. 8 (diaphragm type). ). Therefore, there is a disadvantage in that the details of the joint are complicated and it is difficult to weld the horizontal stiffener to the inside of the steel pipe.

The present invention has been devised in view of such circumstances, and the concrete filled steel pipe column and the H-shaped steel beams are semi-rigid, so no additional diaphragm is required, so that the details of the connection are simple and the welding amount is small, so that the quality of the concrete-filled steel pipe columns and the H-shaped cross section is easy to secure. An object of the present invention is to provide a joint structure of a steel beam and a construction method thereof.

According to a suitable embodiment of the present invention, a concrete filled steel pipe column; Steel beams of which the upper and lower flanges and the web connecting them form an H-shaped cross section; A support member joined to the side of the concrete-filled steel pipe column perpendicular to the longitudinal direction of the column to be bolted to the lower flange of the steel beam; A connecting member disposed above the supporting member and joined to the side of the concrete-filled steel pipe column in the longitudinal direction of the column to be bolted to the web of the steel beam; It has two ends, one end penetrates through the concrete filled steel pipe column and is settled in the concrete filled inside the concrete filled steel pipe column, the other end is welded to the upper flange of the steel beam and the part between the two ends is steel Tensile reinforcement bars spaced apart from the upper flange of the beam; And a reinforced concrete slab integrally synthesized on the upper portion of the steel beam and having a reinforced concrete slab embedded therein, wherein the connection structure between the concrete-filled steel pipe column and the H-shaped steel beam is provided.

 The support member is made of a T-shaped steel one side is welded to the side of the concrete-filled steel pipe pillar and the other surface protruding vertically from one side may be bolted to the lower flange of the steel beam is supported.

The connecting member is composed of a plate and the end face is welded to the side of the filled steel pipe column can be bolted to the web of the steel beam.

According to another suitable embodiment of the present invention, the step of welding the support member to the outer surface of the column in the position where the upper flange, the lower flange and the web connecting the lower flange of the steel beam of the H-shaped cross section is to be joined; Arranging the steel beam so that the lower flange is placed on the supporting member and bolting the supporting member and the lower flange to each other; Welding the connecting member to an outer surface of the column and bolting the connecting member to the web of the steel beam; Welding one end of the reinforcing bar having two ends through the steel pipe to be positioned inside the steel pipe and welding the other end to the upper flange of the steel beam; And installing the slab formwork on the upper part of the steel beam and reinforcing the reinforcing bar, and then placing the interior of the steel pipe and the slab concrete at the same time. do.

The joint portion of the pillar and beam according to the present invention utilizes the reinforced concrete slab synthesized in the steel beam in the column-beam joint, so that the structure of the joint can be more simplified in terms of construction efficiency and construction. In addition, the effect of the slab on the joint, which was ignored in the previous design, is reflected in the moment-rotation angle behavior, allowing for a more clear design.

In addition, by adding additional reinforcing bars to the reinforced concrete slab, it is possible to transfer a considerable amount of moment, and to secure a certain stiffness by adjusting the amount of reinforcing bar and to obtain a certain ductile effect.

In addition, it is possible to prevent the destruction of the cone shape in the concrete inside the filled steel pipe column due to the tensile reinforcing bar, it is advantageous when calculating the effective width of the composite beam.

The following drawings, which are attached in this specification, illustrate the preferred embodiments of the present invention, and together with the detailed description thereof, serve to further understand the technical spirit of the present invention. It should not be construed as limited.
1 is a cross-sectional view showing a joint structure of the concrete-filled steel pipe column and the H-shaped steel beam according to an embodiment of the present invention, Figure 2 is a cross-sectional view taken along the line AA of Figure 1, Figure 3 is a plan view.
FIG. 4 is a cross-sectional view illustrating a joint structure of a concrete filled steel pipe column and an H-shaped steel beam according to another embodiment of the present invention, FIG. 5 is a cross-sectional view taken along line BB of FIG. 4, and FIG. 6 is a plan view thereof.
7 is a cross-sectional view showing a joint structure of the concrete-filled steel pipe column and the H-shaped steel beam according to another embodiment of the present invention.
8 is a partial cutaway perspective view showing a joint structure of a conventional steel pipe column and H-shaped steel beams.

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.

 1 is a cross-sectional view showing a joint structure of the concrete-filled steel pipe column and the H-shaped steel beam according to an embodiment of the present invention, Figure 2 is a cross-sectional view taken along the line A-A of Figure 1, Figure 3 is a plan view.

1 to 3, the joint structure of the concrete filled steel pipe column and the H-shaped steel beam according to an embodiment of the present invention, the concrete filled steel pipe column 10, H-shaped steel beam 20, the column Support member 30 is joined to the side flange and bolted to the lower flange of the steel beam, the connection member 40 is joined to the side of the column and bolted to the web of the steel beam, one end is a concrete-filled square steel pipe column (10) The other end includes a reinforcing bar 50 fixed to the inside and connected to the upper part of the steel beam 20, and a reinforced concrete slab 60 which is integrally synthesized with the upper part of the steel beam and embedded in the reinforcing bar. .

The joint structure according to the present embodiment relates to a joint structure of a column and a beam positioned at an end thereof, and has a structure in which a beam is joined to one side of the column.

In the present embodiment, the column 10 becomes a concrete-filled steel pipe column filled with concrete 12 inside the steel pipe 11. The concrete filled steel pipe structure has structural characteristics with excellent rigidity, strength, and deformation performance due to the composite effect of the steel pipe and concrete, and thus the cross section can be efficiently constructed. The steel pipe 11 may have a round or square cross section known in the art.

The steel beam 20 is composed of upper and lower flanges 21 and 22 and a web 23 connecting them to form an H-shaped cross section as a whole. The steel beam 20 may be made of H-shaped steel, which is a ready-made product, or the upper and lower flanges 21 and 22 and the web 23 may be formed as separate members and welded to each other to produce a built-up method. .

The lower flange 22 of the steel beam 20 through the support member 30, the web 23 through the connecting member 40, and the upper flange 21 through the reinforcing bars 50, respectively, 10).

Specifically, the supporting member 30 is welded to the side surface of the pillar 10 in a direction perpendicular to the longitudinal direction of the pillar 10, and the lower flange 22 of the steel beam 20 is bolted to the supporting member 30.

As the supporting member 30, T-shaped steel can be used as shown, and the steel beam 20 on one side 31 is welded to the column 10 and the other side 32 protrudes vertically from the center of the one side 31. The lower flange 22 of can be placed and bolted.

The support member 30 has a shape having one surface joined to the pillar 10 and the other surface protruded perpendicularly thereto to support the lower flange 22 of the steel beam 20 and bolted to the lower flange 22. Therefore, it is not necessary to be limited to T-shaped steel and L-shaped steel may be used.

In addition, a plate having a single surface may be used in addition to the T-shaped steel or the L-shaped steel. In this case, the end face of the plate may be welded to the column 10 and bolted to the plate and the lower flange 22.

As the support member 30, T-shaped steel, L-shaped steel and plates may be selectively used, but it is preferable to use T-shaped steel that can secure seismic performance by coping with compression and tension acting on the joint.

The web 23 of the steel beam 20 is joined to the column 10 through the connecting member 40. That is, the connecting member 40 is joined to the upper side of the support member 30 in the longitudinal direction of the column 10 on the side of the column 10 and bolted to the web 23 of the steel beam 20. Although the drawing shows an example in which a plate is used as the connecting member 40, T-shaped steel or L-shaped steel may be used similarly to the supporting member 30 described above.

The upper flange 21 and the pillar 10 of the steel beam 20 is connected to the reinforcing bar 50. Tensile reinforcing bar 50 has two ends, one end is a 90 degree standard hook 51 and the other end is formed a 180 degree standard hook 52.

These standard hooks are formed in the reinforced concrete structure to have additional anchoring force when the tensioned reinforcing bar cannot be extended in a straight line by the required anchoring length. The forming method is to define the diameter (D) of the circle inscribed in the curved portion. It is known in the art to be a constant multiple (4-12) of the diameter db.

One end of the reinforcing bar 50 formed with the 90 degree standard hook is penetrated through the steel pipe 11 to be settled in the concrete 12 filled in the inside of the steel pipe 11, and the other end with the 180 degree standard hook is formed. It is welded to the upper flange 21 of the steel beam 20. Thus, the part between the two ends is positioned apart from the upper flange 21 of the steel beam 20.

In FIG. 3, three tensile reinforcing bars 50 are shown to be penetrating through the pillar 10, but may be appropriately increased and reduced in consideration of cracking and the behavior of the pillar-beam joint in the reinforced concrete slab 60. .

Reinforced concrete slab 60 is integrally combined with the upper flange 21 of the steel beam 20. Reinforced concrete slab 60 may be formed by mounting a deck plate and reinforcing the slab reinforcement, and then pouring concrete. Although not shown in the drawing, a shear connecting member is provided on the upper flange 21 for the synthesis of the steel beam 20. Can be installed.

In the reinforced concrete slab 60, the reinforcing bar 50 may be embedded and the transverse reinforcing bars 55 may be further disposed at regular intervals across the reinforcing bar 50.

Hereinafter, a method of constructing a joint portion of a concrete-filled steel pipe column and an H-shaped steel beam according to an embodiment of the present invention configured as described above will be described with reference to FIGS. 1 to 3.

First, the supporting member 30 is welded to the outer surface of the column 10 at the position where the lower flange 22 of the steel beam 20 is to be joined. As the supporting member 30, T-shaped steel, L-shaped steel or a plate may be selectively used.

Next, the steel beam 20 is disposed so that the lower flange 22 is placed on the supporting member 30, and the supporting member 30 and the lower flange 22 are bolted to each other.

Next, the connecting member 40 is welded to the outer surface of the column 10, and the connecting member 40 and the web 23 of the steel beam 20 is bolted. As the connecting member 40, a plate, T-shaped steel or L-shaped steel may be selectively used.

Next, one end of the reinforcing bar 50 having two ends is placed through the steel pipe 11 so as to be located inside the steel pipe 11, and the other end is the upper flange 21 of the steel beam 20. Weld on).

Finally, the slab formwork is installed on the upper part of the steel beam 20 and after reinforcing the reinforcing bar and the interior of the steel pipe 11 and the slab concrete is poured at the same time.

As described in detail above, the joint portion of the pillar and the beam according to the present embodiment simply joins the web 23 and the lower flange 22 of the steel beam 20 to the pillar 10 using a T-shaped steel, an L-shaped steel, or a plate. Reinforced concrete synthesized in the steel beam as a structure for joining the upper flange 21 to the column 10 by using the reinforced concrete slab 60 and the reinforced steel slab embedded in the steel beam 20 and integrally embedded therein Since the slab 60 is also utilized in the column-beam connection, it is not only structurally efficient but also can simplify the connection structure in terms of construction. In addition, the effect of the slab on the joint, which was ignored in the previous design, is reflected in the moment-rotation angle behavior, allowing for a more clear design.

In addition, by adding additional reinforcing bars to the reinforced concrete slab, it is possible to transfer a considerable amount of moment, and to secure a certain stiffness by adjusting the amount of reinforcing bar and to obtain a certain ductile effect.

In addition, by forming a 90-degree standard hook at the end of the reinforcing bar 50 fixed in the concrete filled steel pipe pillars, the cone-shaped destruction of the concrete inside the filled steel pipe columns due to the tensile steel is generated by the tensile force due to the moment acting on the joint (concrete cone failure) can be prevented and it is advantageous when calculating the effective width of composite beam.

FIG. 4 is a cross-sectional view illustrating a joint structure of a concrete filled steel pipe column and an H-shaped steel beam according to another embodiment of the present invention, FIG. 5 is a cross-sectional view taken along line B-B of FIG. 4, and FIG. 6 is a plan view thereof.

The joint structure according to the embodiment shown in FIG. 1 relates to a joint structure of a column and a beam positioned at an end thereof, and is a structure in which a beam is joined to one side of the column, whereas the joint structure according to the present embodiment shown in FIG. Refers to the structure of the connection between the column and the beam located in the center, and the structure and construction method of joining the beam to the column are the same in that the beam is joined to both sides of the column.

That is, the supporting member 30 is installed on both sides of the pillar 10, and the lower flange 22 of the steel beam 20 disposed on both sides of the pillar 10 through the supporting member 30 includes the pillar 10. The web 23 of the steel beam 20 which is bonded to the, and the connection member 40 is installed on both sides of the column 10 and disposed on both sides of the column 10 through the connecting member 40 is a column 10 ), One end is connected to each of the upper flanges 21 of the steel beam 20 in which the tensile reinforcing bar 50 is joined to both sides of the column 10, and the other end is fixed to the inside of the column 10.

7 is a cross-sectional view showing a joint structure of the concrete-filled steel pipe column and the H-shaped steel beam according to another embodiment of the present invention.

The junction structure according to the embodiment shown in FIG. 4 relates to the junction structure of the pillar and the beam positioned in the center, and the beam is joined to both sides of the column, whereas the junction structure according to the present embodiment shown in FIG. The structure and construction method of joining beams to pillars are different in that the beams are connected to one side of the column and the other side located at a 90 degree angle. same.

That is, the supporting member 30 is installed on one side of the pillar 10 and the other side positioned at an angle of 90 degrees, and the steel beam 20 disposed on two side surfaces of the pillar 10 through the supporting member 30. The lower flange 22 of) is joined to the column 10, the connecting member 40 is installed on two sides of the column 10 and disposed on the two sides of the column 10 through the connecting member 40 The webs 23 of the steel beams 20 to be joined are joined to the pillars 10, and the reinforcing bars 50 are respectively connected to the upper flanges 21 of the steel beams 20 joined to the two sides of the pillars 10. One end is connected and the other end is fixed to the inside of the pillar (10).

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: concrete filling steel pipe pillar
11: steel pipe
12: concrete
20: steel beam
21: upper flange
22: lower flange
23: Web
30: support member
40: connecting member
50: tensile rebar
60: reinforced concrete slab

Claims (4)

Concrete filled steel pipe pillars;
Steel beams of which the upper and lower flanges and the web connecting them form an H-shaped cross section;
A support member joined to the side of the concrete-filled steel pipe column perpendicular to the longitudinal direction of the column to be bolted to the lower flange of the steel beam;
A connecting member disposed above the supporting member and joined to the side of the concrete-filled steel pipe column in the longitudinal direction of the column to be bolted to the web of the steel beam;
It has two ends, one end penetrates through the concrete filled steel pipe column and is settled in the concrete filled inside the concrete filled steel pipe column, the other end is welded to the upper flange of the steel beam and the part between the two ends is steel Tensile reinforcement bars spaced apart from the upper flange of the beam; And
A joint structure of a concrete-filled steel pipe column and an H-shaped steel beam, comprising: a reinforced concrete slab integrally synthesized at an upper portion of the steel beam and having a reinforcing steel embedded therein. The method according to claim 1,
The supporting member is composed of a T-shaped steel, one side is welded to the side of the concrete-filled steel pipe column, and the other surface protruded vertically from one side, the concrete-filled steel pipe column and H-type is characterized in that the lower flange of the steel beam is supported and bolted Connection structure of sectional steel beams. The method according to claim 1,
The connecting member is composed of a plate and the end surface is welded to the side of the filled steel pipe column is a joint structure of the concrete filled steel pipe column and the H-shaped steel beam characterized in that the web of the steel beam bolted. Welding the supporting member to the outer surface of the column at the position where the upper flange and the lower flange of the steel beam having the web connecting the upper and lower flanges form an H-shaped cross section;
Arranging the steel beam so that the lower flange is placed on the supporting member and bolting the supporting member and the lower flange to each other;
Welding the connecting member to an outer surface of the column and bolting the connecting member to the web of the steel beam;
Welding one end of the reinforcing bar having two ends through the steel pipe to be positioned inside the steel pipe and welding the other end to the upper flange of the steel beam; And
A method of constructing a joint between a concrete-filled steel pipe column and an H-shaped steel beam comprising the step of installing the slab formwork on the upper part of the steel beam and reinforcing the reinforcing bars and then simultaneously pouring the interior of the steel pipe and the slab concrete.

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