KR20110096099A

KR20110096099A - Composite structural members and steel structural members having projections on the interface between concrete and steel

Info

Publication number: KR20110096099A
Application number: KR1020100130282A
Authority: KR
Inventors: 김승원
Original assignee: 김승원
Priority date: 2010-12-17
Filing date: 2010-12-17
Publication date: 2011-08-29

Abstract

The present invention relates to a concrete-filled composite cross-section structural member having a cross-section of concrete and steel integrally formed by filling concrete in the internal space of the structure made of structural steel, specifically, to construct a concrete-filled composite cross-section structural material According to the present invention, a concrete-filled composite cross-section structural member having increased rigidity against external force by increasing frictional resistance or shear strength between concrete and steel by using steel having protruding patterns on its surface will be.
In the present invention is a concrete-filled composite cross-sectional structural member having a structure that is filled with the steel constituting the shell and the concrete is poured into the interior space of the cross section at the cross section of the structural member formed by the steel, wherein the steel is a plurality of protruding shape Protruding pattern (1) formed by forming a projection pattern is made of a protruding pattern steel is formed on the inner surface in the direction of the inner space; Provided is a concrete-filled composite cross-section structural member, and a protruding pattern steel structural material, characterized in that the shear strength is increased by the coupling between the concrete placed in the inner space and the protrusion pattern (1).

Description

Steel Structural Members and Concrete Structural Members Having Projections on the Interface between Concrete and Steel}

The present invention relates to a concrete-filled composite cross-section structural material having a cross-section of the concrete and the steel is integrally formed by filling concrete in the internal space of the structure consisting of structural steel ("steel structural material"), specifically, concrete filled In constructing a composite composite cross-section structure, by using the steel with the protruding pattern on the surface, the concrete filling which greatly increased the stiffness against the force applied from the outside by increasing the frictional resistance or shear strength between the concrete and the steel The present invention relates to a cross-sectional composite structural member and a steel structural member having a protruding pattern therefor.

Concrete-filled composite section structural members such as columns and composite beams are made of steel having an internal space and concrete poured in the internal space, and have a cross-section that surrounds the exterior of the concrete. Since the concrete is constrained, it exhibits superior characteristics in terms of rigidity, strength, deformation performance, fire resistance, workability, and the like than structures having other cross-sectional structures. In addition, these concrete-filled composite cross-sections are more economical and more versatile than other cross-sectional structures and can be used for both low and high-rise constructions, especially when used as structural members in underground top-down construction. The advantages are maximized.

However, until now, steels developed for general structural use have been used for such composite cross-section structural members, and only steels for concrete composite cross-section structural structures have not been developed worldwide.

However, the conventional general structural steel, which has been used in such a composite cross-section structural material until now, because the surface contacting the concrete is flat, the adhesion strength or shear strength between the steel and concrete in the steel and concrete joint surface was very insufficient. Therefore, the concrete-filled composite cross-section using the conventional structural steel, when the external force is applied, the separation caused by the sliding between the steel and concrete occurs. In particular, in the concrete-filled composite cross-section structure, the shear stress is concentrated in the load introduction section, where the shear stress often exceeds the direct bond strength between the concrete and the steel in the load introduction section and other parts.

In this case, it is difficult to apply concrete filled composite cross-section structural material to actual construction, or complicated detail is required for design and construction, which increases construction cost, requires a lot of manpower and air for manufacturing and construction, and decreases structural reliability. The problem arises. Due to these problems, many cases have been applied to construction in order to avoid the use of concrete-filled composite section structures.

In addition, the compressive strength of the super-high-strength concrete composite column filled with the recently-used super high-strength concrete is significantly increased, but the compressive force sharing ratio of the concrete is significantly increased compared to the steel pipe, so the load between the inner surface of the steel pipe and the filled concrete filled in the steel pipe is increased. Since a very large shear strength is required at the inlet, it is more difficult to use a conventional concrete-filled composite cross-section using a steel plate having a flat surface as described above. In order to secure the compressive strength more efficiently, even when the cross-sectional area of the steel pipe is small or the thickness of the steel pipe is minimized, very large shear strength is required at the load introduction part.

In addition, in the event of fire, the strength of the steel forming the outer edge of the concrete composite column is greatly reduced, and the strength of the concrete inside the steel pipe is reduced. Therefore, the direct bond strength between the inner surface of the steel pipe and the filled concrete is greatly reduced due to the loss of strength of the steel pipe part exposed to fire, which may cause the floor structure to slide off the column surface.

In the concrete composite beam, which is another example of the concrete composite cross-section structural material, a stress greater than the direct bond strength is generated between the inner surface of the steel and the filled concrete, resulting in a problem in that the composite behavior cannot be expected.

The present invention was developed to solve the above problems of the prior art, specifically, a load in which shear stress is largely and intensively generated between the steel surface and concrete in the filling-type composite member at the joint or joint portion to which external force is transmitted. It prevents slipping between the steel surface and concrete, effectively preventing slippage between the steel surface and concrete at the introduction portion as well as the load introduction portion, eliminating the troublesome work of penetrating the reinforcement to the steel cross section. Since there is no big protrusion, concrete pouring and rebar mesh insertion can be made smoothly, and it is basically to provide a concrete-filled composite cross-section structural material that can improve not only the structural performance required as a structural material, but also fire resistance, workability and economy. do.

In order to achieve the above object, in the present invention, as a concrete-filled composite cross-section structural material having a structure that is filled with concrete in the interior space of the cross-section in the cross-section of the steel and the structural member formed by the steel, the steel The protrusion pattern formed by forming a plurality of protrusions of the protruding shape is formed of a protruding pattern steel is formed on the inner surface in the direction of the inner space; Provided is a concrete-filled composite cross-section structural material characterized in that the shear strength is increased by the coupling between the concrete cast in the interior space and the projecting pattern.

In addition, in the present invention, a plurality of protrusions of the protruding shape is formed by forming a pattern of the protruding pattern is formed of a steel pipe made of a protruding pattern steel material is formed on the inner surface in the hollow direction; Made of concrete filled in the hollow inside of the steel pipe; A concrete filled composite pillar is provided, characterized in that the shear strength is increased between the inner surface of the steel pipe and the concrete due to the protruding pattern in the hollow interior of the steel pipe.

In addition, the present invention, the steel beam is formed by bending a plate made of a steel material is formed on the surface of the protrusion pattern is formed by forming a plurality of protrusions of the projecting shape pattern; Consists of concrete filled in the inner space consisting of a surface on which the projecting pattern is formed in the steel beam; The projecting pattern provides a concrete-filled composite beam, characterized in that the shear strength is increased between the surface of the steel beam and the concrete.

In addition, in the present invention, as a steel structural material suitable for manufacturing the above-described concrete-filled structural member, a plurality of protrusions of the protruding shape is made of a steel material is formed on the surface is formed by the protrusion pattern formed by forming a pattern, the concrete is A space for pouring is formed; Provided is a protruding pattern steel structure material, characterized in that the protruding pattern is formed on the surface in the inner surface direction toward the space in which the concrete is to be poured.

In particular, the protruding pattern steel structure according to the present invention, to be suitable for the production of the concrete-filled composite pillar, may have a configuration in which the cross section of the space in which the concrete can be poured has a closed cross section and has a tubular form, another form In order to be suitable for manufacturing the above-described concrete-filled composite beam, the steel material is formed on the surface protruding pattern may be made of a plate, and may have a configuration having a form of bent section steel is formed by bending the plate.

According to the present invention, the ability to prevent the slip generated between the steel surface and the concrete in the load introduction portion and other sections of the concrete-filled composite structural material is greatly improved, so that no additional shear reinforcement is required. Therefore, there are no large protrusions on the inner surface of the steel, there is no process for installing the cumbersome shear reinforcement without cutting the middle of the member, and no welding is required to improve the structural performance, economic efficiency, workability, air shortening, etc. The utilization of concrete-filled composite structures in the construction field is becoming active, and the steel industry is generating new demand due to the creation of various protruding steels.

1 is a schematic cross-sectional view of a concrete-filled composite column of concrete-filled composite cross-section structure according to the present invention, the concrete filled in a circular steel pipe.
FIG. 2 is a schematic perspective view of a circular steel tube made of a protruding steel sheet according to the present invention used to construct the concrete-filled composite pillar shown in FIG.
3 and 4 are schematic perspective views of steel pipes each having a rectangular cross section and a polygonal cross section, each having a protruding pattern steel.
5 is a schematic cross-sectional view of a concrete-filled composite beam as another embodiment of the concrete-filled composite cross-section structure according to the present invention.
FIG. 6 is a schematic perspective view of an open steel beam made of protruding pattern steel according to the present invention used to construct the concrete filled composite beam shown in FIG.
7 is a perspective view of another embodiment of a steel beam for forming a concrete-filled composite beam.
8 and 9 is a schematic view of a steel beam having a through-hole through which concrete can be introduced on the upper surface of the steel beam by forming a steel beam in the form of a closed cross section by bending a plate made of steel having a protruding pattern, respectively. Perspective view.
FIG. 10 is a schematic perspective view of a closed cross-section steel beam made by bending a steel plate having a protruding pattern to have a closed cross-sectional shape.
12 and 13 are schematic cross-sectional views of an embodiment in which one closed cross-sectional steel beam is formed by bonding four bent steel plates formed by bending steel plates having four protruding patterns, respectively.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Although the present invention has been described with reference to the embodiments shown in the drawings, this is described as one embodiment, whereby the technical spirit of the present invention and its core configuration and operation are not limited.

1 is a schematic cross-sectional view of a concrete-filled composite pillar having a structure filled with concrete 3 in a circular steel pipe as an embodiment of the concrete-filled composite cross-section structure according to the present invention, and FIG. A schematic perspective view of a circular steel tube made of a protruding steel sheet according to the invention used to construct the concrete filled composite column shown in FIG. 1 is shown.

As shown in Figure 1 and 2, the inner surface of the cylindrical steel pipe is formed by forming a plurality of protrusions protruding shape. For reference, in the present specification, a plurality of projections forming a pattern in a shape protruding from the surface of the steel is abbreviated as "protrusion pattern (1)". As described above, using a steel material (hereinafter, abbreviated as “protrusion pattern steel”) formed in a state in which the protruding pattern 1 is evenly distributed on the surface, a cylindrical steel pipe is manufactured so that the protruding pattern 1 is located on the inner surface. When the concrete 3 is filled into the steel pipe to produce a concrete-filled composite pillar, the shearing pattern 1 greatly increases the shear strength between the inner surface of the steel pipe and the concrete 3. Therefore, compared with the conventional concrete-filled composite column using a steel pipe made of steel having a flat surface without protruding pattern, the concrete-filled composite column according to the present invention has the effect of securing a high shear strength not only in the load introduction portion but also in other sections. Exerted.

Thus, in producing a concrete-filled composite column using a steel pipe made of a protruding pattern steel on the inner surface, the steel pipe is not limited to the cylindrical cross section. 3 and 4 disclose a steel pipe having a rectangular cross section and a polygonal cross section, respectively, wherein the steel pipe is formed of a protruding pattern steel on the inner surface thereof, and various types of steel pipes may be used, including those illustrated in FIGS. .

Concrete-filled composite cross-section structure according to the present invention may be implemented as a concrete-filled composite beam in addition to the above-described concrete-filled composite pillar, Figure 5 is another embodiment of the concrete-filled composite cross-section structure according to the present invention, concrete A schematic cross sectional view of a filled composite beam is shown. FIG. 6 is a schematic perspective view of an open steel beam made of a protruding pattern steel according to the present invention used to construct the concrete-filled composite beam shown in FIG. 5, and FIG. 7 is a steel for forming a concrete-filled composite beam. A perspective view of another embodiment of the beam is shown.

As shown in FIGS. 5 and 6, the plate formed of the protruding pattern steel is bent to form an open type steel beam having an open top, and the concrete is formed in the inner space where the protruding pattern 1 is positioned in the steel beam. It is possible to implement the concrete-filled composite cross-section structural material according to the present invention as the concrete-filled composite beam 3 is poured. In the embodiment illustrated in FIG. 6, the upper surface of the steel beam is opened and the upper flange is opened outward. However, as shown in FIG. 7, the upper flange of the steel beam may be bent inwardly. . In FIG. 6 and FIG. 7, reference numeral 12 denotes a steel connector 12 connecting the upper flanges of the steel beams to each other.

Meanwhile, FIGS. 8 and 9 respectively form a steel beam in the form of a closed cross-section by bending a plate made of steel having a protruding pattern 1 formed therein, but through-holes 13 into which concrete can flow into the upper surface of the steel beam. This formed steel beam is illustrated (a rectangular through hole is formed in the embodiment shown in FIG. 8, and a circular through hole is formed in the embodiment shown in FIG. 9). In the embodiment shown in Figures 8 and 9, the protruding pattern 1 is formed on the surface of the portion to be filled with concrete, the reinforcement is reinforced in the closed cross-sectional space of the steel beam and the concrete is filled to form a filled composite beam .

In the concrete-filled composite beam according to the present invention, the shear strength is greatly increased between the inner surface of the steel beam and the concrete by the formation of the protruding pattern 1, in particular, in addition to the load introduction portion where the shear stress is concentrated. In the section, the shear strength between the inner surface of the steel beam and concrete is greatly increased.

In forming a steel beam in the form of a closed cross-section by bending a plate made of steel on which the protruding pattern 1 is formed, a plurality of bent steel plates may be joined to produce a single closed cross-section steel beam.

FIG. 10 is a schematic perspective view of a closed cross-section steel beam made by bending a steel plate having a protruding pattern 1 to have a closed cross-sectional shape. In the embodiment shown in FIG. 10, the plate made of the protruding pattern steel is bent to have a U-shaped cross section, and the steel plates of the U cross-sections on both sides are joined to face each other based on the longitudinal center line of the beam to be joined to each other. A steel beam was formed. In order to face and join the bent steel plates of the cross-sections on both sides of the two sides, the parts that are in contact with each other are vertically bent toward the inner space of the steel beam, and the parts that are in contact with each other are integrally joined by welding or the like. Can be. After forming the closed cross-section steel beam using the two bent steel plate in this way, to fill the concrete inside the closed cross-sectional space to form a composite beam. If necessary, reinforcing bars can be placed in concrete.

FIG. 11 is a schematic perspective view of the modified embodiment of FIG. 10. In the embodiment shown in FIG. 11, in the embodiment shown in FIG. Only the difference is different and the other configuration is the same as FIG. Therefore, description of other components of the embodiment shown in FIG. 11 is omitted.

Meanwhile, in forming a closed cross-sectional steel beam by joining a plurality of bent steel plates, as illustrated in FIGS. 10 and 11, four or more bent steel plates are not limited to using two bent steel plates. Can also be used.

12 and 13 are schematic cross-sectional views of an embodiment in which one bent cross-section steel beam is formed by joining four bent steel plates formed by bending steel plates on which four protruding patterns 1 are formed, respectively. It is. As in the embodiment shown in Figure 12 is bent to form a steel plate with a protruding pattern (1) to have a letter A cross-section, the four steel plate cross-sections of the four A-shaped cross section facing each other based on the longitudinal center line of the beam The steel beam of the closed section can be formed. In order to face and combine the bent steel plate of the cross-section, the parts facing each other can be vertically bent toward the inner space of the steel beam, and the bent parts can be integrally combined by welding or the like in a state in which they face each other. . The embodiment shown in FIG. 13 is a state in which the portions bent to face each other in the embodiment shown in FIG. 12 are further bent again.

12 and 13, the protrusion pattern 1 is evenly distributed on the inner surface of the steel beam, so that the concrete is filled in the closed inner space of the steel beam, so that the filled composite beam is manufactured. The shear strength is greatly increased between the inner surface and the concrete, and the gap between the inner surface of the steel beam and the concrete in the section other than the load introduction portion where the shear force is generated by the bending moment of the beam as well as the load introduction portion such as the joint portion with other structural members. Shear strength is greatly increased.

As such, according to the present invention, the ability to prevent the slip between the steel and concrete is greatly improved to separate additional shear stiffeners (shear studs, steel penetration nails, stiffeners, gusset plates, acupressure bands, etc.) There is no need to use. Therefore, the steel beam or the inner surface of the steel pipe which is a closed cross-section does not have a large protrusion, does not cut the middle of the member, and eliminates the need for cumbersome shear reinforcement, and also has a large inside of the steel cross section. There is no protrusion, so concrete pouring or rebar mesh insertion is smooth.

Therefore, not only the structural performance, which is basically required as a structural material, but also the fire resistance, workability and economic efficiency are improved, and the air shortening effect is exhibited. Therefore, the use of concrete-filled composite structures in the construction field is active. The creation of protruding steel products will create new demand.

Concrete-filled composite cross-section structural material according to the present invention can be implemented in various structural members in addition to the concrete-filled composite pillar or concrete-filled composite beam illustrated above. In addition, in the present invention, in manufacturing the plate using the protruding pattern steel, the shape of the protruding pattern 1, that is, the size, spacing, protruding height, arrangement direction, arrangement shape, etc. of the protruding pattern 1 is variously changed. You can.

1: protrusion
3: concrete

Claims

As a concrete-filled composite cross-section structural member having a structure that is filled with the steel constituting the outer shell and, in the cross section of the structural member formed by the steel in the interior space of the cross-section,
The steel is made of a protruding pattern steel is formed on the inner surface in the direction of the inner space is formed with a protrusion pattern (1) formed by forming a plurality of protrusions of the protruding shape in a pattern;
Concrete-filled composite cross-section structural material, characterized in that the shear strength is increased by the coupling between the concrete and the projecting pattern (1) placed in the inner space.

A steel pipe made of a protruding pattern steel material having a protruding pattern 1 formed in a plurality of protrusions having a protruding shape formed on a patterned inner surface thereof in a hollow direction;
Made of concrete filled in the hollow inside of the steel pipe;
Concrete-filled composite pillar, characterized in that the shear strength is increased between the inner surface of the steel pipe and the concrete (3) due to the protruding pattern (1) in the hollow interior of the steel pipe.

A steel beam formed by bending a plate made of steel having a protruding pattern 1 formed on a surface thereof, the protruding pattern 1 being formed by forming a plurality of protrusions forming a pattern;
It is made of concrete filled in the inner space consisting of the surface on which the projecting pattern (1) is formed in the steel beam;
Concrete-filled composite beam, characterized in that the shear strength is increased between the surface of the steel beam and the concrete (3) due to the protruding pattern (1).

A plurality of protrusions having a protruding shape are made of steel having a protruding pattern 1 formed on a surface thereof, which is formed by forming a pattern.
A space is formed in which concrete can be poured;
The protruding pattern steel structure material, characterized in that the protruding pattern (1) is formed on the surface of the inner surface direction toward the space in which the concrete is poured.

The method of claim 4, wherein
A protruding pattern steel structural material, characterized in that the cross section of the space where concrete can be poured has a closed cross section and has a tubular shape.

The method of claim 4, wherein
The steel with the protruding pattern 1 formed on the surface is made of a sheet material,
The protruding pattern steel structure member, characterized in that it has a form of bending steel that is formed by bending the plate.