Composite Beam Combined with Concrete and Steel

Abstract

The present invention relates to a composite beam combining concrete and steel used in architectural or civil engineering structures. The composite beam according to the present invention comprises a U-shaped base channel (120) having a receiving space for pouring concrete (10) inside, an inverted T-shaped lower chord (130) disposed inside the base channel, and an upper coupling member (140) that wraps around and connects the upper end of the web (132) of the lower chord (130). In particular, a plurality of holes (160, 162) are formed at corresponding positions in the connecting piece (144) of the web (132) of the lower chord (130) and the upper coupling member (140), thereby forming a physical concrete dowel as the poured concrete hardens, thereby providing strong shear connection performance without the need for separate stud bolt welding. Additionally, the rib (172) structure inside the base channel (120) increases adhesion with the concrete and doubles the core restraint effect, thereby maximizing the overall stiffness and torsional resistance of the composite beam.

Description

Technology Field

[0001] The present invention relates to a composite beam used in architectural or civil engineering structures, and more specifically, to a composite beam in which concrete is filled inside a steel structure to maximize structural performance. Background Technology

[0002] Generally, composite beams applied to bridge piers or beam structures of large buildings enhance structural performance by integrating steel sections and concrete. Currently, existing composite beam structures primarily utilize a method of separately welding and attaching shear connectors, such as multiple stud bolts, to the surface of the steel to ensure the integrity between the steel and concrete.

[0003] However, the existing method has the problem of complex processes and increased costs because it requires welding separate shear connectors (such as stud bolts). In addition, there is a need to secure torsional rigidity and achieve stability through a symmetrical structure. Prior art literature

[0004] Patent Registration No. 10-1329483 Patent Registration No. 10-1376782 The problem to be solved

[0005] The present invention aims to provide a composite beam that maximizes structural performance through the robust integration of truss reinforcement and base channel, by improving concrete compressive strength through excellent torsional stiffness and core restraint effects, realizing a stable composite beam through structural symmetry, securing shear connection performance solely through processing without separate parts. means of solving the problem

[0006] The present invention for achieving the above objective comprises: a U-shaped base channel (120) having a receiving space in which concrete (10) is poured; an inverted T-shaped lower chord (130) disposed inside the base channel (120) and including a vertical web (132) and flanges (134) extending to both sides from the bottom thereof; and an upper assembly (140) having a pair of connecting pieces (144) on the bottom surface of a horizontal plate (142) and connected to the web (132) of the inverted T-shaped lower chord (130) by a fixing member. In particular, the invention is characterized in that the poured concrete (10) forms a concrete dowel through a hole (160) formed in the web (132) of the lower chord (130) and the connecting piece (144) of the upper chord.

[0007] Composition of the lower section (130): It includes a vertically formed web (132) and flanges (134) extending horizontally from the bottom of the web on both sides, and the bottom surface of the flanges (134) contacts the upper surface of the lower plate (122) of the base channel (120).

[0008] Configuration of the upper assembly (140): A pair of connecting pieces (144) are provided on the bottom surface of the horizontal plate (142) and are connected to the web (132) of the lower chord (130) as a fixing member.

[0009] Shear connection structure: A plurality of holes (160) are formed in the web (132) of the lower chord (130) to serve as shear connection materials, and an upper joint-side hole (162) is formed at a position corresponding to the connecting piece (144) of the upper joint (140) to form a concrete (10) wedge (Concrete Dowel). Effects of the invention

[0010] The composite beam combining concrete and steel according to the present invention can be expected to have the following effects.

[0011] Structural stability: Due to the deep confinement effect, the compressive strength of the concrete is enhanced and torsional stiffness is excellent.

[0012] Construction efficiency: The manufacturing process is simplified by achieving shear connection performance solely through hole machining, without the need for separate shear connectors.

[0013] Joint rigidity: Fastening members such as bolts and nuts vertically penetrate the lower chord and base channel to firmly secure the truss reinforcement.

[0014] The effects according to the present invention are not limited to those exemplified above, and a wider variety of effects are included within the present invention. That is, the effects of the present invention are not limited to those mentioned above, and various effects may be included within the scope obvious to a person skilled in the art from the description below. Brief explanation of the drawing

[0015] FIG. 1 is an exploded perspective view illustrating each component of a composite beam according to the present invention. FIG. 2 is a combined perspective view illustrating the combined form of a composite beam according to the present invention. FIG. 3 is an assembly cross-sectional view and an enlarged view of the main part showing the state in which the lower chord and the base channel are vertically fastened by a fixing member. FIG. 4 is an assembly cross-sectional view and an enlarged view of the main part illustrating a structure in which the web hole of the lower chord and the hole of the upper assembly overlap to form a concrete dowel. FIG. 5 is a perspective view and an enlarged view of the main part illustrating the combined state of a base channel and a lower chord with a shaped (hexagonal) hole formed therein according to one embodiment of the present invention. FIG. 6 is a perspective view illustrating the overall shape of the upper assembly according to the present invention. FIG. 7 is a side view and an enlarged view of the main part showing the state in which a shaped hole is formed in the connecting piece of the upper assembly. FIG. 8 is a cross-sectional view and an enlarged view of the main part illustrating a structure in which a rib is formed on the inner side of the base channel to increase the friction area. Specific details for implementing the invention

[0016] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. The objectives, features, and advantages of the present invention will be more easily understood by referring to the attached drawings and the following detailed description. Furthermore, in describing the present invention, if it is determined that a detailed description of related known components or functions may obscure the essence of the present invention, such detailed description is omitted.

[0017] In addition, terms such as first, second, A, B, (a), (b), etc., may be used when describing the components of the present invention. These terms are intended only to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by the terms. For example, where it is stated that a component is "connected," "combined," or "connected" to another component, it should be understood that the component may be directly connected to or connected to the other component, but that another component may also be "connected," "combined," or "connected" between each component.

[0018] The composite beam according to the present invention is a structure that combines the tensile strength of steel and the compressive strength of concrete (10), and has the following detailed configuration.

[0019] The base channel (120) has a U-shaped cross-section with an open top, forming a receiving space where concrete (10) can be poured inside. An inverted T-shaped lower chord (130) is seated on the inner bottom surface of the base channel (120). The lower chord (130) consists of a vertical web (132) and a horizontal flange (134). As shown in FIG. 3, the bottom surface of the flange (134) of the lower chord (130) is in close contact with the upper surface of the lower plate (122) of the base channel (120), and a fastening member such as a bolt (152) and a nut (154) penetrates them vertically to firmly connect them.

[0020] An upper assembly (140) is positioned on the upper part of the lower chord (130). The upper assembly (140) includes a horizontal plate portion (142) forming an upper surface and a pair of connecting pieces (144) protruding below it. These connecting pieces (144) are arranged to wrap around both upper sides of the web (132) of the lower chord (130) and are joined by a fixing member. In particular, referring to FIG. 4, holes (160) are drilled at regular intervals in the web (132) of the lower chord (130), and holes (162) on the upper assembly side are formed in the connecting pieces (144) of the upper assembly (140) at corresponding positions.

[0021] When pouring concrete (10), the concrete (10) flows through the holes (160) of the web (132) and the holes (162) on the upper assembly side, and as it hardens, it forms a physical concrete dowel (10), which acts as a shear connector to prevent slippage between the steel and the concrete (10) and completes an integrated composite structure.

[0022] As a result, concrete (10) is filled into the internal space sealed by the above components, thereby realizing a composite beam having high compressive strength and structural stability along with the deep restraint effect by the base channel (120).

[0023] Accordingly, the present invention has the effect of maximizing the bonding strength between the steel frame and the concrete (10) through the concrete (10) wedge formed by filling the holes (160) of the lower chord (130) and the upper assembly side holes (162) formed in the upper assembly (140), the effect of improving the compressive strength of the concrete (10) by generating a deep restraint effect in which the U-shaped base channel (120) restrains the internal concrete (10), and the effect of excellent load distribution and structural stability by adopting a left-right symmetrical connection structure.

[0024] The effects of the present invention are summarized as follows.

[0025] Structural stability: Due to the deep confinement effect, the compressive strength of the concrete (10) is improved and the torsional rigidity is excellent.

[0026] Construction efficiency: The manufacturing process is simplified by performing shear connection performance solely through the processing of the hole (160) and the upper joint side hole (162) without the need for a separate shear connector.

[0027] Connection strength: A fixing member, such as a bolt (152) and a nut (154), vertically penetrates the lower chord (130) and the base channel (120) to firmly secure the truss reinforcement (TRS).

[0028] Meanwhile, the present invention is characterized in that the hole (160) of the web (132) of the lower chord (130) and the upper coupling side hole (162) formed in the connecting piece (144) of the upper coupling member (140) are formed in an atypical shape such as an elliptical, polygonal, or sawtooth shape, thereby strengthening resistance to rotation and slippage when combined with concrete (10) filled inside.

[0029] In the case of a typical circular hole (160), the concrete dowel formed during the pouring of concrete (10) resists shear force but is susceptible to slight rotation or flow in the axial direction. Therefore, in the present invention, the hole (160) and the upper joint-side hole (162) are designed as irregular structures with an elliptical or polygonal shape, or with sawtooth-shaped irregularities formed on the edges, thereby maximizing the physical interlocking effect between the concrete (10) and the steel frame interface. This enables the hole to function as a high-performance shear connector without the need for separate stud bolt welding.

[0030] Accordingly, the concrete (10) wedge formed by the irregular holes (160), that is, the holes (160) and the upper joint-side holes (162), resists multi-directional shear force and rotational moment, thereby further improving the integrity of the steel frame and concrete (10).

[0031] In addition, the present invention is characterized in that a plurality of ribs (172) are formed on the inner surface of the U-shaped base channel (120) or on the upper surface of the lower plate (122) to increase the friction area with the concrete (10) being filled.

[0032] The base channel (120) serves to increase compressive strength by restraining the concrete (10) filled inside. Additionally, by forming raised or recessed linear ribs (172) on the inner wall of the base channel (120), the adhesion between the steel and the concrete (10) is physically enhanced. This prevents relative slip between the steel channel and the concrete (10) core that may occur when an external load is applied, and particularly stabilizes the structural behavior under long-term load.

[0033] Accordingly, the present invention has the effect of increasing the overall bending stiffness and durability of the composite beam by doubling the confinement effect through the uneven structure inside the base channel (120).

[0034] Terms such as "include," "compose," or "have" as described above, unless specifically stated otherwise, mean that the relevant component may be inherent; therefore, they should be interpreted as allowing for the inclusion of additional components rather than excluding them. All terms, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains, unless otherwise defined. Commonly used terms, such as those defined in advance, should be interpreted in accordance with their meaning in the context of the relevant technology and, unless explicitly defined in the present invention, should not be interpreted in an ideal or overly formal sense.

[0035] The foregoing description is merely an illustrative explanation of the technical concept of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations within the scope of the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are intended to explain, not limit, the technical concept of the present invention, and the scope of the technical concept of the present invention is not limited by these embodiments. The scope of protection of the present invention shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention.

[0036] Accordingly, the embodiments described above are provided to fully inform those skilled in the art of the scope of the invention and should be understood as illustrative in all respects and not restrictive, and the invention is defined only by the scope of the claims. Explanation of the symbols

[0037] 10. Concrete 120. Bass Channel 122. Bottom plate 130. Ha Hyun-jae 132. Webb 134. Flange 140. Upper assembly 142. Horizontal plate 144. Connecting Section TRS. Truss reinforcement 152. Bolt 154. Nut 160. Hole 162. Upper assembly side hole 172. Liv

Claims

Claim 1 A U-shaped base channel (120) having a receiving space for pouring concrete (10) inside; a lower chord (130) having an inverted T-shaped cross section that is seated inside the base channel (120) and includes a vertically formed web (132) and flanges (134) extending horizontally on both sides from the bottom of the web (132); and an upper coupling member (140) that is connected to the web (132) of the lower chord (130) by a fixing member by having a pair of connecting pieces (144) on the bottom surface of a horizontal plate portion (142), wherein a plurality of holes (160) are formed at regular intervals in the vertical web (132) of the inverted T-shaped lower chord (130) to serve as a shear connector that increases the bonding strength with the poured concrete (10), and the connecting pieces (144) of the upper coupling member (140) have upper holes (160) at positions corresponding to the holes (160) in the web (132) of the lower chord (130). A composite beam combining concrete and steel, characterized in that a joint-side hole (162) is formed, and concrete (10) is filled between the hole (160) of the web (132) and the connecting piece (144) and the upper joint-side hole (162) to form a concrete dowel (10). Claim 2 A composite beam combining concrete and steel, characterized in that, in claim 1, the bottom surface of the flange (134) of the lower chord (130) is positioned in contact with the upper surface of the lower plate (122) of the U-shaped base channel (120), and the fixing member penetrates the flange (134) of the lower chord (130) and the lower plate (122) of the U-shaped base channel (120) in a vertical direction to connect the lower chord (130) and the base channel (120). Claim 3 delete Claim 4 delete Claim 5 A composite beam combining concrete and steel, characterized in that, in claim 1, concrete (10) is filled into the internal space formed by the upper assembly (140), lower chord (130), and base channel (120), thereby forming a composite structure in which the steel structure and the concrete (10) are integrated. Claim 6 A composite beam combining concrete and steel, characterized in that, in claim 1, the connection structure of the inverted T-shaped lower chord (130) and the upper assembly (140) is configured symmetrically to provide structural stability, and the compressive strength of the filled concrete (10) is improved by the deep restraint effect by the base channel (120).

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