KR20160144782A - Hybrid beam having tube-type flanges - Google Patents

Hybrid beam having tube-type flanges Download PDF

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Publication number
KR20160144782A
KR20160144782A KR1020150081376A KR20150081376A KR20160144782A KR 20160144782 A KR20160144782 A KR 20160144782A KR 1020150081376 A KR1020150081376 A KR 1020150081376A KR 20150081376 A KR20150081376 A KR 20150081376A KR 20160144782 A KR20160144782 A KR 20160144782A
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South Korea
Prior art keywords
flange
plate
tube
steel
upper flange
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KR1020150081376A
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Korean (ko)
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KR101732719B1 (en
Inventor
유중모
정석재
김영호
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(주)엔아이스틸
(주)엔테이지
(주)쓰리디엔지니어링
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Priority to KR1020150081376A priority Critical patent/KR101732719B1/en
Publication of KR20160144782A publication Critical patent/KR20160144782A/en
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Publication of KR101732719B1 publication Critical patent/KR101732719B1/en

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/29—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
    • E04C3/293—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures the materials being steel and concrete

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Rod-Shaped Construction Members (AREA)

Abstract

The present invention relates to a hybrid beam having a tube-shaped flange, and more specifically, to a hybrid beam having a tube-shaped flange which forms an upper and a lower flange in a tube shape instead of a single steel plate to provide excellent twisting resistance even if formed in a long span, and fills the upper and the lower flange of the tube shape with concrete to prevent local buckling of a compression zone steel plate to behave stably even if realized in a long span. According to a proper embodiment of the present invention, the hybrid beam having a tube-shaped flange comprises: an upper flange horizontally formed in a steel tube shape; a lower flange formed in a steel tube shape and separated from the upper flange below the upper flange; a web to vertically join middle portions of the upper flange and the lower flange in a width direction; and concrete filled in the upper flange.

Description

[0001] The present invention relates to a hybrid beam having tube-type flanges,

The present invention relates to a hybrid beam having a tubular flange, and more particularly, to a hybrid beam having a tubular flange. More specifically, the present invention relates to a hybrid beam having a tubular flange, The present invention relates to a hybrid beam having a tubular flange capable of preventing a localized buckling of a compression zone steel plate so that a stable behavior can be obtained even if the steel plate is realized as a long span.

The steel structure is widely used in buildings requiring large-scale spaces such as high-rise buildings, hangars, gymnasiums, airports, factories, and the like from a mild building such as a warehouse as a representative structure method of modern architecture together with a reinforced concrete structure.

In particular, large H-beam beams are generally adopted as beam members in steel structures for constructing long span structures. In the case of a large H-beam beam, the resistance of the bending moment is relatively large compared to the distance between the supporting points. This may be effective for resistance to bending moment, but deflection occurs in the beam itself due to bending moment , Deflection easily tends to rotate the beam cross-section, causing a deflection-torsion problem. That is, since the cross section of the H-shaped steel composed of the upper flange and the lower flange and the web has a biaxial symmetrical cross section, the torsion of the cross section is easily exposed from the rotation center, and the torsional rotation occurs simultaneously with the bending deformation. This phenomenon is caused by the fact that the upper and lower flanges have a small shear resistance area due to the cross-sectional characteristics of the H-shaped steel, which is composed of a single steel plate, resulting in a bending-torsional buckling phenomenon.

Further, there is a problem that the upper flange formed in the compression zone can not be free from local buckling when it is constituted by a long span. Local buckling is a function of the width to thickness ratio. To solve local buckling, it is necessary to increase the thickness of the steel plate, which is an uneconomical problem due to the increase of steel amount.

In particular, in the case of H-beams supporting large pipes (pipe and pipe rack) in plant facilities, the upper flange must perform the function of dustproof to absorb energy from vibration or fatigue from large pipes. There is a problem that there is a limit even if the thickness is increased.

As a background technology of the present invention, there is a patent registration No. 0851490 entitled " Steel Structure Composite Structure for Floor Height Reduction "(Patent Document 1). This patent discloses that the width of the lower flange is made larger than the width of the upper flange among the I-shaped steel bars made of the web, the upper flange and the lower flange, and a web hole is formed at the center portion of the web so as to be spaced apart from both the upper flange and the lower flange Wherein a bracket support plate is provided at both ends of the lower flange so as to extend along the longitudinal direction of the steel beam, and a slab concrete is installed in a deck installed on the bracket support plate; The web holes are formed in a trapezoidal shape with a narrow upper side and a wide base, and a brace type support plate is welded to both ends of the lower flange by line welding or integrally formed with the lower flange; The steel frame is divided into a long U-shape with a long dancing and a small short with a small dance. When the U-shape and the small one are connected at a constant angle, a small U-shaped support plate is mounted on the U- The web hole of the U-shaped beam is formed to be positioned between the upper surface of the U-shaped support plate of the small beam and the upper surface of the U-shaped support plate of the U-beam so that the duct can pass therethrough. do.

However, since the steel composite beam proposed by this patent forms an upper flange over the entire length of the web, it consumes a large amount of steel material, which results in not only an excessive production cost but also a web hole in the web The shape of the U-shaped beam is so complicated that it is difficult to construct the structure of the U-shaped beam, and the U-shaped beam and the sectional shape of the small beam The column-to-beam connection method is different from the conventional steel-to-steel connection method, so that the conventional steel-to-metal connection method such as conventional bracket-type beam connection can not be used.

Patent No. 0851490 "Structural Steel Composite Structure for Floor Height Reduction"

The present invention relates to a steel pipe having a tubular flange constituting an upper and a lower flange in a tubular shape rather than a single steel plate so as to improve lateral buckling resistance due to buckling or twisting of a plate element in forming a beam for long span by using a plate element called a steel plate We want to provide a hybrid beam.

Especially, when it is constructed as a long span, a large compressive force acts on the upper flange formed in the compression zone, so that the concrete is filled in the tubular upper flange to reinforce the compression zone economically without increasing the thickness to solve the local buckling problem of the plate elements in the compression zone And to provide a hybrid beam having a tubular flange in which a compression type flange of a charging type can absorb vibration and fatigue.

Also, it is intended to provide a hybrid beam having a tubular flange with an economical effect that the thickness of the steel sheet of the tensile member can be reduced due to the rise of the neutral axis due to the compression zone reinforcement.

An upper flange formed as a horizontal tubular steel tubular type having a tubular flange according to a preferred embodiment of the present invention; A lower flange constructed of a steel tubular type and spaced apart below the upper flange; A web vertically coupling a widthwise middle portion of the upper flange and the lower flange; And concrete filled in the upper flange.

Here, the tensile reinforcement material may be composed of any one of a steel bar, a strand of wire, and a reinforcing bar and is stretched in the longitudinal direction inside the lower flange.

The upper flange includes a top plate, a vertical plate extending vertically downward at both end portions in the width direction of the top plate, and a bottom plate extending inward in the horizontal direction at a lower end of the vertical plate; A horizontal plate coupled at both ends to the lower end of the lower plate to connect both lower plates; And an enlarging swarf board which is composed of a steel plate having an area larger than the cross sectional area of the tube and which is coupled so as to protrude both downward in the width direction of the tube and downward in the height direction and in which bolt holes are drilled in both widthwise and downward protrusions .

On the other hand, the lower flange includes a lower plate, a vertical plate extending vertically downward at both ends in the width direction of the lower plate, and a top plate extending inward in the horizontal direction at the upper end of the vertical plate; And a horizontal plate coupled to both ends of the upper end of the upper plate to connect both upper plates.

At this time, the horizontal plate of the upper flange and the horizontal plate of the web and the lower flange may be formed of integral H-shaped steel.

The expanding wing plate is composed of a steel plate having an area larger than the cross sectional area of the lower flange tube and is coupled so as to protrude downward on both sides in the width direction of the tube and downward in the height direction and in which bolt holes are drilled on the protrusions on both sides in the width direction and downward in the height direction The concrete can be filled in the space surrounded by the tube, the horizontal plate and the expanding whorl.

At this time, the upper flange expansion marker board and the lower flange extension marker board may be integrally formed to be connected to each other in the width direction center portion.

Here, the through-holes formed by cutting the upper end of the web into a predetermined size may be formed at regular intervals in the longitudinal direction.

On the other hand, the web may be composed of a corrugated steel sheet.

In the case of forming a beam by using a plate element called a hybrid steel plate having a tubular flange according to the present invention, even when the beam is composed of an elongated span, the upper and lower flanges are made of a tube instead of a single steel plate, The lateral buckling resistance is improved.

Particularly, even if a large compressive force is applied by filling concrete in the upper flange formed in the compression zone, the local buckling problem can be solved without increasing the thickness of the steel sheet, so that it is possible to realize a long span.

In addition, as the area and strength of the compression zone are reinforced, the neutral axis rises, so that the member can more stably behave, and the thickness of the steel sheet of the tensile member can be reduced, thereby reducing the amount of steel.

1 is a perspective view of a hybrid beam having a tubular flange according to an embodiment of the present invention, and Fig. 2 is a sectional view.
3 is a cross-sectional view of a hybrid beam having a tubular flange according to another embodiment of the present invention.
4 is a plan view showing various shapes of a magnifying whistle plate according to the present invention.
5 is a cross-sectional view of a hybrid beam having a tubular flange according to another embodiment of the present invention.
6 is a cross-sectional view of a hybrid beam having a tubular flange according to another embodiment of the present invention.
7 is a cross-sectional view of a hybrid beam having a tubular flange according to another embodiment of the present invention.

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.

 Hereinafter, the technical structure of the present invention will be described in detail with reference to the preferred embodiments.

1 is a perspective view of a hybrid beam having a tubular flange according to an embodiment of the present invention, and Fig. 2 is a sectional view.

The upper flange 10 and the lower flange 20 are formed of a hybrid type tube type having a tubular flange according to the present invention and are vertically spaced from each other. The web 30, which vertically couples the upper and lower flanges, And a concrete (40) filled in the concrete.

The upper flange 10, the lower flange 20, and the web 30 are all formed by molding a steel sheet, which has a problem in that the lateral buckling resistance due to buckling or twisting is low when the beam is formed as a long span. The upper flange 10 and the lower flange 20 are formed into a tubular shape instead of a single steel plate to increase the cross-sectional size of the resistance against torsion without increasing the thickness of the steel sheet, thereby enhancing the torsional rigidity economically.

Particularly, the upper flange 10 formed in the compression zone has a problem in that it can not be free from local buckling due to a large compressive force when it is constructed as a long span. In order to solve the local buckling, local buckling should be accompanied by an increase in the thickness of the steel plate. In the present invention, the upper flange 10 is formed as a tube instead of a single steel plate, ) Is filled with concrete to reinforce the compression zone economically without increasing the thickness of the steel plate. As the area of the compression side increases, the value of the moment of inertia J rises, which means that the rotational resistance is increased, so that the stiffness against torsion is also reinforced. In addition, since the area and strength of the compression zone are reinforced, the neutral axis rises, and therefore, the member can perform a more stable behavior, and the thickness of the steel sheet of the tensile member can be reduced, thereby reducing the amount of steel.

Although the upper flange 10 and the lower flange 20 are shown as being parallel to each other in FIG. 1, the present invention is not limited thereto. The upper flange 10 and the lower flange 20 may be formed to have a certain angle The case is not excluded.

The upper and lower flanges 10 and 20 are formed in a tubular cross-section. As shown in FIGS. 1 and 2, the upper and lower flanges 10 and 20 have a U-shaped cross section opened tube 11 and an open end of the tubes 11 and 21 And a flat plate (12, 22) for covering.

The reason why the upper and lower flanges 10 and 20 are divided into the tubes 11 and 21 and the horizontal plates 12 and 22 without constituting a single corrugated pipe is as follows.

The flange is designed as a tubular shape. The tube-shaped cross section produced in Korea is defined as a square section having a size of 500x500 (mm) and a rectangular section having a size of 200x400 (mm) in the KSD 3568 standard. , There is a problem in that it is not effective for the sectional configuration to use a tubular member produced in the country. Therefore, according to the present invention, a U-shaped tube (11, 21) having an open cross section is formed by bending a steel plate so that the upper and lower flanges (10, 20) The flat plates 12 and 22 are closed to form a tubular section. Another advantage of dividing the upper and lower flanges 10 and 20 by the tubes 11 and 21 and the horizontal plates 12 and 22 is that the upper flange plate 12, the web 30, (22) can be constructed by using an H-shaped steel which is widely used in this field, so that it is possible to easily supply the material and simplify the production.

The upper flange 10 further includes an enlarging swash plate 13 which includes the tube 11 and the horizontal plate 12 and closes both ends of the tube 11 as described above.

The tube 11 includes an upper plate 111 and a lower plate 112 extending vertically downward at both ends in the width direction of the upper plate 111 and a lower plate 112 extending inwardly in the horizontal direction at lower ends of the vertical plate 112. [ (113).

The horizontal plate 12 is coupled so that both ends thereof connect the both side lower plates 113 of the tube 11.

The expansion whorl plate 13 is a means for sealing the concrete filled in the tube 11 by being coupled to both ends of the tube 11 and is a means for increasing the torsional resistance distance of the tube 11 to increase the torsional rigidity, . ≪ / RTI > The expansion whorl plate 13 is composed of a steel plate having an area larger than the cross sectional area of the tube 11 and is coupled so as to protrude downward on both sides in the width direction of the tube 11 and in the height direction. Bolt holes 131 for engagement with other members are to be drilled in the projections on both sides in the width direction and downward in the height direction. The enlarged hemispherical plate 13 has an advantage that the number of bolts can be reduced and the stress can be alleviated since an effective bolt arrangement can be achieved by increasing the area of contact when contacting adjacent members.

The concrete 40 is filled in the inner space formed by the tube 11 of the upper flange 10, the horizontal plate 12, and the expanding whorl plate 13. Since the upper flange 10 formed of a steel plate and formed in the compression zone is prevented from local buckling due to the filled concrete 40, it can be configured to have excellent strength while reducing the amount of steel, (11), the horizontal plate (12) and the expanding whorl plate (13), it is ensured that the compressive strength is increased in the triaxial stressed state, and the durability is improved by preventing cracking and neutralization because it is not exposed to the outside .

Since the shape and configuration of the lower flange 20 are the same as those of the upper flange 10, the repeated description will be omitted.

2, a tensile stiffener 50 may be disposed in the tube 21 of the lower flange 20 in the longitudinal direction. The tensile reinforcement 50 is a means for supplementing the tensile force of the lower flange 20, and may be formed of any one of a steel bar, a strand of steel, and a reinforcing bar. Further, both ends of the tensile reinforcement 50 may be fixed to a fixing plate (not shown) to introduce a prestress to prevent sagging at the time of construction.

3 is a cross-sectional view of a hybrid beam having a tubular flange according to another embodiment of the present invention.

In this embodiment, not only the upper flange 10 but also the lower flange 20 is filled with concrete. When reinforcement is required not only on the compression side but also on the tensile side, it is possible to increase the thickness of the steel plate or to reinforce the steel economically by filling the concrete without further forming a steel reinforcement.

4 is a plan view showing various shapes of a magnifying whistle plate according to the present invention.

4A, when the concrete is filled in the lower flange 20 as described above, the expansion flange 20 is formed not only in the upper flange 10 but also in the lower flange 20. Since the configuration and shape of the lower flange 20 expansion marker board 23 are the same as those of the upper flange 10 expansion marker board 13, the repeated description will be omitted.

The upper flange 10 and the lower flange 20 may each be configured as shown in Figure 4A and may be configured as shown in Figure 4b and may include an upper flange 10, And the center of the width direction of the lower edge flange 20 and the center edge of the lower edge flange 20 in the width direction. 4B, the upper flange 10 and the lower flange 20 extend upward and downward in the height direction of the upper flange tube 11 and the lower flange tube 21, respectively, As shown in Fig.

5 is a cross-sectional view of a hybrid beam having a tubular flange according to another embodiment of the present invention.

In this embodiment, contrary to the previous embodiment, when the tensile side has sufficient strength, the cross section of the lower flange 20 is formed smaller than the cross-sectional area of the upper flange 10, so that the amount of steel can be reduced.

6 is a cross-sectional view of a hybrid beam having a tubular flange according to another embodiment of the present invention.

In this embodiment, the upper end portion of the web 30 may be cut to a predetermined size at predetermined intervals to form the through-hole 31. That is, the through-holes 31 may be repeatedly formed at predetermined intervals so as to form a waveform on the upper end of the web. When the hybrid beam having the tubular flange according to the present invention is integrally formed with the slab, it is possible to penetrate the slab reinforcement so as to facilitate the continuous laying of the bottom plate reinforcement, So that the concrete on both sides of the concrete can be synthesized integrally without being disconnected. The through-hole 31 may be formed in various shapes such as a triangular shape, a square shape, a trapezoid shape, and a circular shape.

7 is a cross-sectional view of a hybrid beam having a tubular flange according to another embodiment of the present invention.

In the previous embodiment, the web 30 is formed of a flat steel plate, but the present invention is not limited to this, and the web 30 may be formed of a corrugated steel plate as shown in FIG. In FIG. 7, the web 30 is shown as a rectangular steel plate bent repeatedly at a predetermined angle. However, the web 30 may be bent into a triangular shape, a square shape, a ladder shape, or the like, .

As described above, according to the present invention, even when the beam is formed by using a plate element called a steel plate, the upper and lower flanges are formed as tubes rather than a single steel plate, and the lateral buckling resistance .

In particular, since the upper flange formed in the compression zone is formed by filling concrete, the local buckling problem can be solved without increasing the thickness of the steel sheet even if a large compression force is applied.

In addition, as the area and strength of the compression zone are reinforced, the neutral axis rises, so that the member can more stably behave, and the thickness of the steel sheet of the tensile member can be reduced, thereby reducing the amount of steel.

10: upper flange 11: upper flange tube
111: top plate 112: vertical plate
113: bottom plate 12: upper flange plate
13: Upper flange expansion marker board 131: Bolt hole
20: Lower flange 21: Lower flange tube
22: Lower flange wedge plate 23: Lower flange expansion marker plate
30: web 31: through hole
40: concrete 50: tensile reinforcement

Claims (9)

An upper flange (10) made of a steel tube and formed horizontally;
A lower flange 20 made of a steel tubular type and spaced apart from the lower portion of the upper flange 10;
A web 30 for vertically coupling the upper flange 10 and the lower flange 20 in the widthwise center portion thereof; And
And a concrete (40) filled in the upper flange (10). The method according to claim 1,
And a tensile stiffener (50) composed of a steel bar, a strand, and a reinforcing bar and arranged in the longitudinal direction inside the lower flange (20). The method according to claim 1,
The upper flange (10)
And a lower plate 113 extending inward in the horizontal direction from the lower ends of the vertical plates 112 and the vertical plates 112 extending downward in the width direction at both ends in the width direction of the upper plate 111 (11);
A horizontal plate (12) having opposite ends joined to the extending ends of the lower plates (113, 113) to connect the lower plates (113, 113); And
And a bolt hole 131 is formed in a protruding portion on both sides in the width direction and in the downward direction in the height direction, And an expanding whorl plate (13). The method of claim 3,
The lower flange (20)
And a top plate 213 extending inward in the horizontal direction from the upper ends of the vertical plates 212 and the vertical plates 212 extending vertically downward at both ends in the width direction of the lower plate 211 A tube 21;
And a horizontal plate (22) having opposite ends joined to the extending ends of the upper plates (213, 213) to connect the upper plates (213, 213) to each other. 5. The method of claim 4,
Wherein the horizontal plate (12) of the upper flange (10), the web (30), and the horizontal plate (22) of the lower flange (20) are made of integral H - shaped steel. 5. The method of claim 4,
The flange 20 is formed of a steel plate having an area larger than the cross-sectional area of the tube 21 and is coupled so as to protrude both downward in the width direction of the tube 21 and downward in the height direction. 231) are pierced, and an expanding edge board (23)
Wherein the concrete is filled in a space surrounded by the tube (21), the horizontal plate (22) and the expanding whorl plate (23). The method according to claim 6,
Wherein the upper flange (10) and the lower flange (20) are integrally formed so that a width direction central portion thereof is connected to each other. 5. The method of claim 4,
The web (30)
And a through hole (31) formed by cutting an upper end portion to a predetermined size is formed at a predetermined interval in the longitudinal direction. 5. The method of claim 4,
A hybrid beam having a tubular flange, characterized in that the web (30) is composed of a corrugated steel plate.
KR1020150081376A 2015-06-09 2015-06-09 Hybrid beam having tube-type flanges KR101732719B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200065966A (en) * 2018-11-30 2020-06-09 주식회사 포스코 Long-span composite beam

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102597270B1 (en) 2022-09-29 2023-11-02 (주)지아이건설 Prestressed composite steel beam for building and the construction method using the same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100851490B1 (en) 2006-08-30 2008-08-08 주식회사 포스코 Structure for steel composite beam for reducing story height

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101064731B1 (en) * 2011-03-16 2011-09-14 김선주 Steel-concrete composite girder and constructing method thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100851490B1 (en) 2006-08-30 2008-08-08 주식회사 포스코 Structure for steel composite beam for reducing story height

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200065966A (en) * 2018-11-30 2020-06-09 주식회사 포스코 Long-span composite beam

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