Steel plate built-up beam for steel-concrete composite beam

Abstract

The present invention relates to a steel plate built-up beam for a steel-concrete composite beam, wherein one-side legs of upper angles (23) are coupled to upper portions of side surfaces of a pair of web plates (21) spaced apart from each other. More specifically, the present invention relates to a steel plate built-up beam for a steel-concrete composite beam, wherein not only welding can be minimized during fabrication, but the thickness of the upper angle can also be configured freely, thereby ensuring an excellent sectional efficiency. Figure 4

Description

Steel plate assembly for reinforced concrete composite beams

[0001] The present invention relates to a steel plate assembly for a steel concrete composite beam in which one leg of an upper angle is joined to the upper side of a pair of mutually spaced web plates, and more specifically, to a steel plate assembly for a steel concrete composite beam in which welding is minimized during manufacturing and the thickness of the upper angle can be freely set, thereby providing excellent cross-sectional efficiency.

[0002] TSC composite beams have been developed and are being used to increase cross-sectional efficiency by filling concrete inside an open steel plate during concrete beam construction and integrating it with the slab.

[0003] TSC composite beams not only reduce the amount of steel required, but also shorten the construction period by eliminating the need for formwork installation. Furthermore, compared to conventional composite beams, TSC composite beams offer several advantages: the ability to produce beams of any width using cold forming, the freedom to choose the steel grade and thickness of the lower flange, and the freedom to arrange the number of steel wires and bolts.

[0004] As shown in Fig. 1, the TSC composite beam is composed of a U-shaped steel plate with an open upper portion, and an upper flange (230) bent inward or outward is formed at the upper end.

[0005] The upper flange (230) can be formed integrally by bending the upper portion of the web plate (210). However, if the required thicknesses of the upper flange (230) and the web plate (210) are different as a result of the structural calculation, the member must be manufactured based on the thicker side, which may result in an excessive amount of steel being required.

[0006] In contrast, the upper flange (230) of the TSC formed as a built-up cross-section as shown in Fig. 2 can be manufactured separately and welded to the upper end of the web plate (210).

[0007] However, the connection of the upper flange (230) and the web plate (210) requires a separate welding inspection even through automatic welding, which takes a considerable amount of manufacturing time. In addition, there is a risk of deformation of the member due to welding heat.

[0008] In order to solve the above problems, the present invention aims to provide a steel plate assembly for a steel concrete composite beam having excellent structural performance while minimizing the welding process when manufacturing a steel plate assembly beam to form a steel concrete composite beam by filling the interior with concrete.

[0009] The present invention, according to a preferred embodiment, relates to a steel plate assembly for forming a steel-concrete composite beam by filling the interior with concrete, and provides a steel plate assembly for a steel-concrete composite beam, characterized in that it comprises a pair of web plates spaced apart from each other; a lower flange provided on the lower portion of the web plates to connect the lower portions of the pair of web plates; and an upper angle provided on the upper portion of each of the web plates, one leg of which is connected to a side surface of the web plate and the other leg of which is formed by bending in a direction perpendicular to the web plate.

[0010] According to another preferred embodiment, the present invention provides a steel plate assembly for a reinforced concrete composite beam, characterized in that one leg of the upper angle is connected to a web plate by a connecting bolt.

[0011] According to another preferred embodiment, the present invention provides a steel plate assembly for a reinforced concrete composite beam, characterized in that at least one of the above-mentioned connecting bolts is a through bolt that penetrates both web plates.

[0012] According to another preferred embodiment, the present invention provides a steel plate assembly for a reinforced concrete composite beam, characterized in that the one leg is joined to the inner surface of the web plate.

[0013] According to another preferred embodiment, the present invention provides a steel plate assembly for a reinforced concrete composite beam, characterized in that the other leg of the upper angle is provided at the upper height of the web plate.

[0014] According to the present invention as described above, the following effects are achieved.

[0015] First, when manufacturing a steel plate assembly filled with concrete to form a reinforced concrete composite beam, a steel plate assembly can be provided comprising an upper angle, each leg of which is joined to the upper side of a pair of mutually spaced web plates. Therefore, the thickness of the upper angle can be set independently of the web plate, maximizing cross-sectional efficiency.

[0016] Second, since the entire cross-section of the upper angle, which is a steel beam, functions as an upper flange, the width of the other leg can be narrower than that of a conventional TSC beam. This maximizes the space between the upper angles on both sides, facilitating the pouring of concrete within.

[0017] Third, when one leg of the upper angle and the web plate are connected to each other using a connecting bolt, the manufacturing time can be shortened by minimizing welding work and deformation of the member due to welding heat can be prevented.

[0018] Figure 1 is a cross-sectional view showing a folded TSC beam.

[0019] Figure 2 is a cross-sectional view showing a built-up TSC beam.

[0020] Figure 3 is a perspective view showing the details of the joint of the steel plate assembly for the composite beam of reinforced concrete of the present invention.

[0021] Figure 4 is a perspective view showing an embodiment of a steel plate assembly for a composite beam made of reinforced concrete according to the present invention.

[0022] Fig. 5 is a cross-sectional view showing a steel concrete composite beam using the steel plate assembly of Fig. 4.

[0023] Figure 6 is a perspective view showing another embodiment of a steel plate assembly for a composite beam made of reinforced concrete of the present invention.

[0024] Fig. 7 is a cross-sectional view showing a reinforced concrete composite beam using the steel plate assembly of Fig. 6.

[0025] Figure 8 is a perspective view showing the joint state of a PSRC column and a steel plate assembly beam.

[0026] Fig. 9 is a cross-sectional view showing the PSRC column and steel plate assembly of Fig. 8.

[0027] In order to achieve the above object, the steel plate assembly for a steel-concrete composite beam of the present invention relates to a steel plate assembly for forming a steel-concrete composite beam by filling the interior with concrete, and is characterized by comprising: a pair of web plates spaced apart from each other; a lower flange provided on the lower portion of the web plates to connect the lower portions of the pair of web plates; and an upper angle provided on each upper portion of the web plates, one leg of which is connected to the side surface of the web plate and the other leg of which is formed by bending in a direction perpendicular to the web plate.

[0028] Hereinafter, the present invention will be described in detail with reference to the attached drawings and preferred embodiments.

[0029]

[0030] Fig. 3 is a perspective view showing the details of the joint of a steel plate assembly for a reinforced concrete composite beam of the present invention, Fig. 4 is a perspective view showing an example of a steel plate assembly for a reinforced concrete composite beam of the present invention, and Fig. 5 is a cross-sectional view showing a reinforced concrete composite beam using the steel plate assembly of Fig. 4.

[0031] And Fig. 6 is a perspective view showing another embodiment of a steel plate assembly for a reinforced concrete composite beam of the present invention, and Fig. 7 is a cross-sectional view showing a reinforced concrete composite beam using the steel plate assembly of Fig. 6.

[0032] In addition, Fig. 8 is a perspective view showing the state of the connection between the PSRC column and the steel plate assembly, and Fig. 9 is a cross-sectional view showing the PSRC column and the steel plate assembly of Fig. 8.

[0033] As illustrated in FIGS. 3 to 5, etc., the steel plate assembly for a reinforced concrete composite beam of the present invention is formed by filling the interior with concrete (C) to form a reinforced concrete composite beam, and is characterized by comprising: a pair of web plates (21) spaced apart from each other; a lower flange (22) provided on the lower portion of the web plate (21) to connect the lower portions of the pair of web plates (21); and an upper angle (23) provided on the upper portion of the web plate (21), one leg (231) being joined to the side surface of the web plate (21) and the other leg (232) being bent in a direction perpendicular to the web plate (21).

[0034] The present invention is to provide a steel plate assembly for a steel concrete composite beam having excellent structural performance while minimizing the welding process when manufacturing a steel plate assembly beam for forming a steel concrete composite beam by filling the interior with concrete (C).

[0035] The steel plate assembly (2) for the composite beam of reinforced concrete of the present invention is configured to include a web plate (21), a lower flange (22), and an upper angle (23).

[0036] The above web plates (21) are provided in pairs spaced apart from each other on the left and right.

[0037] The above web plate (21) acts as a stirrup of an existing RC beam and supports the shear force acting on the beam.

[0038]

[0039] The above lower flange (22) is provided on the lower part of the web plate (21) and connects the lower parts of a pair of web plates (21).

[0040] The above lower flange (22) serves as the lower reinforcement of the RC beam.

[0041] The above lower flange (22) can be formed by bending it so as to extend integrally with the web plate (21).

[0042] In addition, the lower flange (22) may be formed of a separate steel plate from the web plate (21) as illustrated in FIG. 3 and may be welded to the web plate (21). In this case, the thicknesses of the web plate (21) and the lower flange (22) may be set differently, thereby maximizing cross-sectional efficiency. That is, the lower flange (22), which primarily resists the bending of the beam, may be configured to have a thick thickness, while the web plate (21), which merely supports shear force, may be configured to have a relatively thin thickness.

[0043] As shown in Fig. 3, when the lower flange (22) is welded to the inner side of the lower end of the web plate (21), there is no part protruding outward from the web plate (21), so dust accumulation on the member itself can be fundamentally prevented.

[0044] Stud bolts (ST) or the like for integration with concrete (C) can be combined on the upper surface of the lower flange (22) (Fig. 4).

[0045]

[0046] The above upper angle (23) is provided on the upper part of each web plate (21).

[0047] The above upper angle (23) serves as an upper flange and is connected to the upper side of the web plate (21).

[0048] One leg (231) of the upper angle (23) is joined to the side of the web plate (21), and the other leg (232) is formed by bending in a direction perpendicular to the web plate (21).

[0049] Unlike the conventional TSC beam, which supports the tensile force acting on the upper part of the beam due to the bending moment in the parent moment section only by the upper flange in the shape of a plate, in the present invention, it is supported by the upper angle (23) which is a shaped steel material.

[0050] Accordingly, since the entire cross-section of one leg (231) and the other leg (232) of the upper angle (23) functions as an upper flange, the width of the other leg (232) can be formed narrower than the upper flange of the existing TSC beam when the same structural performance is used as the standard. In other words, since the space between the upper angles (23) on both sides can be secured as much as possible, it is easy to pour concrete (C) inside.

[0051] The length of one leg (231) of the upper angle (23) is sufficient to be the length for joining with the web plate (21). In addition, since the other leg (232) of the upper angle (23) has a greater influence on the cross-sectional coefficient, it is preferable to use an unequal angle in which the length of the other leg (232) is longer than the length of the one leg (231) of the upper angle (23).

[0052] The other leg (232) of the upper angle (23) may be provided to face the outside or inside of the web plate (21).

[0053] In particular, when the steel plate assembly beam (2) of the present invention is attached to a PSRC column (3) in which a L-shaped steel (31) is arranged inside the column, if the other leg (232) of the upper angle (23) is provided so as to face the inside of the web plate (21), it is easy to directly attach the upper angle (23) to the L-shaped steel (31) of the PSRC column (3).

[0054] That is, as shown in FIGS. 8 and 9, one side leg (311) of the upper angle (23) can be fixed by a bolt or the like by being pressed against the surface of one side leg (311) constituting the L-shaped steel (31) of the PSRC column (3). At this time, the upper angle (23) is configured to penetrate the PSRC column (3) in order to transmit the upper moment of the beam.

[0055] The upper angle (23) above can have a different thickness independently of the web plate (21), so it has excellent cross-sectional efficiency.

[0056]

[0057] Meanwhile, a formwork such as a deck plate (10) for pouring slab (1) concrete can be installed on the upper surface of the other leg (232) of the upper angle (23) (Fig. 5, Fig. 7).

[0058] In addition, a stud bolt (ST) or the like can be combined on the upper surface of the other leg (232) of the upper angle (23) to integrate it with the slab concrete.

[0059]

[0060] As shown in FIG. 4, FIG. 5, etc., one leg (231) of the upper angle (23) can be connected to the web plate (21) by a connecting bolt (24).

[0061] In this case, the manufacturing time can be shortened by minimizing welding work, and deformation of the part due to welding heat can be prevented.

[0062] The above-mentioned connecting bolt (24) or the nut (25) fastened to the connecting bolt (24) is embedded in the concrete (C) poured inside the steel plate assembly (2) and acts as a shear connecting material, thereby integrating the steel plate assembly (2) and the concrete (C).

[0063] A plurality of through holes for the penetration of the connecting bolt (24) can be formed in corresponding positions in one leg (231) of the above web plate (21) and the upper angle (23).

[0064]

[0065] As shown in FIG. 4, FIG. 5, etc., at least one of the above-described connecting bolts (24) may be configured as a through bolt (24') that penetrates both web plates (21).

[0066] The connecting bolt (24) that fixes the upper angle (23) to the web plate (21) can be formed as a through bolt (24') that is a long bolt, so that the upper angles (23) on both sides can be fixed simultaneously.

[0067] In addition, the above-mentioned through bolt (24') prevents the steel plate assembly (2) from spreading due to the lateral pressure of the concrete. Therefore, a separate form tie is unnecessary.

[0068] The above-mentioned through bolt (24') is installed so as to penetrate both the left and right web plates (21), and one leg (231) of each upper angle (23) and the inner and outer sides of the web plate (21) are fixed by fastening a nut (25).

[0069]

[0070] As shown in FIG. 5, FIG. 7, etc., one leg (231) of the upper angle (23) can be joined to the inner surface of the web plate (21).

[0071] In this case, since one leg (231) of the upper angle (23) is not exposed to the outside of the web plate (21), external finishing is easy.

[0072] In addition, when one side leg (231) of the upper angle (23) is joined to the outer surface of the web plate (21), concrete paste may leak between the web plate (21) and one side leg (231) of the upper angle (23), thereby contaminating the surface of the web plate (21). Therefore, one side leg (231) of the upper angle (23) is joined to the inner side of the web plate (21), so that the joint surface of these members is positioned on the inner side of the steel plate assembly beam (2).

[0073] Accordingly, whether the other leg (232) of the upper angle (23) is bent toward the inside or outside of the web plate (21), it is possible to prevent concrete paste from leaking to the outer surface of the web plate (21) through the paste joint surface.

[0074]

[0075] As shown in FIGS. 3 to 5, the other leg (232) of the upper angle (23) can be configured to be provided at the upper height of the web plate (21).

[0076] By matching the height of the upper end of the web plate (21) and the upper angle (23), the deck plate (10) can be supported simultaneously by the web plate (21) and the upper angle (23), enabling stable support.

[0077] In the positive moment section, a large compressive force is generated at the upper part of the cross-section, and since one leg (231) of the upper angle (23) is in close contact with the side of the web plate (21) and supports it, buckling of the plate at the upper part of the web plate (21) can be prevented.

[0078] The steel plate assembly for a reinforced concrete composite beam of the present invention comprises an upper angle, each leg of which is joined to the upper side of a pair of mutually spaced web plates. This minimizes welding during manufacturing and allows the thickness of the upper angle to be freely set, thereby maximizing cross-sectional efficiency. Furthermore, since the space between the upper angles on both sides can be secured to the maximum extent, it facilitates pouring concrete inside, suggesting industrial applicability.

Claims

1. Regarding a steel plate assembly beam (2) filled with concrete (C) inside to form a reinforced concrete composite beam, A pair of mutually spaced web plates (21); A lower flange (22) provided at the lower portion of the above web plate (21) and connecting the lower portions of a pair of web plates (21); and A steel plate assembly for a reinforced concrete composite beam, characterized in that it is provided on the upper portion of the web plate (21), and one leg (231) is connected to the side of the web plate (21) and the other leg (232) is formed by bending in a direction perpendicular to the web plate (21).

2. In paragraph 1, A steel plate assembly for a composite beam made of reinforced concrete, characterized in that one leg (231) of the upper angle (23) is connected to a web plate (21) by a connecting bolt (24).

3. In paragraph 2, A steel plate assembly for a reinforced concrete composite beam, characterized in that at least one of the above-mentioned connecting bolts (24) is a through bolt (24') that penetrates both web plates (21).

4. In paragraph 1, A steel plate assembly for a reinforced concrete composite beam, characterized in that the above one-side leg (231) is joined to the inner surface of the web plate (21).

5. In paragraph 1, A steel plate assembly beam for a reinforced concrete composite beam, characterized in that the other leg (232) of the upper angle (23) is provided at the upper height of the web plate (21).