Shearing force connecting piece for composite beam and composite beam

Abstract

The invention relates to the technical field of composite beam connecting pieces, and provides a shear connecting piece for a composite beam and the composite beam. The shear connecting piece comprises a main body rod part and a plurality of sheared parts integrally formed on the main body rod part; the multiple sheared parts are arranged on the first side face of the main body rod part at intervals in the length direction of the main body rod part, and each sheared part comprises an extending part connected with the first side face of the main body rod part and a clamping head part located at the end, away from the main body rod part, of the extending part; a plurality of threaded holes can be further formed in the main body rod portion, the main body rod portion is provided with a second side face opposite to the first side face, the threaded holes penetrate through the first side face and the second side face, and the shearing force connecting piece for the composite beam is high in reliability and stability.

Description

Technical Field

[0001] The present application relates to the technical field of composite beam connectors, and more specifically, to a shear connector for a composite beam and a composite beam. Background Art

[0002] Composite beams are beams made of two different materials or different processes. A typical composite beam is a steel-concrete composite beam, which is a new type of structure developed on the basis of steel and concrete structures. It mainly sets shear connectors (studs, channel steel, bending bars, etc.) between the steel beam and the concrete flange plate to resist the lifting and relative sliding of the two at the interface, so that they work together as a whole.

[0003] The advantages of composite beams make them a popular choice for a variety of construction projects, including buildings, bridges, and industrial structures. In composite beam design, the steel-concrete composite beam works together to resist bending and shear forces. However, in order for the two components to work together and take advantage of the properties of each material, an effective longitudinal shear connector must be developed and installed between them.

[0004] A traditional shear connector for steel-concrete composite beams is shear nails, which are widely used to transfer longitudinal shear forces between steel beams and concrete slabs. At the construction site, the shear nails are connected to the top flange of the steel beam by on-site welding and extend into the top slab after concrete pouring. The disadvantages of shear nails are mainly: First, on-site welding is highly dependent on the experience of workers. Poor welding quality may cause premature fracture of shear nails and poor connection reliability. In addition, once the composite beam is built, it is difficult to separate the top concrete slab and the bottom steel beam without additional cutting procedures. Therefore, these components are difficult to reuse and will generate a large amount of construction waste at the end of their service life.

[0005] Another traditional shear connector for steel-concrete composite beams is a removable bolted shear connector. Test results show that bolted shear connectors can perform comparable to traditional shear studs. However, considering the construction tolerance, over-large bolt holes in the steel beam may lead to inevitable initial slip between the top plate and the bottom steel beam, which further weakens the structural performance of the composite beam under the service limit state, and the connection reliability and stability are poor. In addition, the corrosion of high-strength bolts and local deformation of the bolt rod may also bring some difficulties to the disassembly of the composite beam. Summary of the invention

[0006] The main purpose of the present invention is to provide a shear connector for composite beams, aiming to solve the technical problems in the prior art of unstable welding quality of shear connectors for composite beams, long on-site construction period, and inability to reuse plates and steel beams after installation.

[0007] To achieve the above object, the technical solution adopted by the present invention is: a shear connector for a composite beam, which includes:

[0008] A main body rod and a plurality of shearing portions integrally formed on the main body rod, wherein the plurality of shearing portions are arranged at intervals on the first side surface of the main body rod along the length direction of the main body rod, the shearing portion comprises an extension portion connected to the first side surface of the main body rod and a clamping portion located at an end of the extension portion away from the main body rod, a plurality of threaded holes may also be provided on the main body rod, the main body rod has a second side surface opposite to the first side surface, and the threaded holes penetrate the first side surface and the second side surface.

[0009] Further, the cross-sectional dimension of the clamping portion is greater than the cross-sectional dimension of the extending portion.

[0010] Furthermore, the shear connector for the composite beam is a corrosion-resistant part.

[0011] Furthermore, the threaded holes are respectively arranged on the outer sides of the two outermost sheared parts along the length direction of the main body rod, and the threaded hole is arranged between the two innermost sheared parts along the length direction of the main body rod.

[0012] In addition, the present invention further provides a composite beam, wherein the composite beam comprises the above-mentioned shear connector for composite beams, and the composite beam further comprises:

[0013] A plurality of embedded plates, each of which has a first notch groove formed thereon;

[0014] A concrete slab connected to the plurality of embedded slabs, wherein the plurality of embedded slabs are sequentially arranged at intervals along the concrete slab;

[0015] A metal beam having a metal beam connecting portion, wherein a second notch groove is formed on the metal beam connecting portion, wherein the number of the second notch grooves corresponds to the number of the plurality of embedded plates, and the plurality of the second notch grooves are aligned with each of the first notch grooves;

[0016] The extension portions of each of the multiple sheared parts are located in the corresponding first notch groove and second notch groove, the embedded plate and the metal beam connecting part are limited between the main rod part and the clamping part of the sheared part, the clamping part, the embedded plate, the metal beam connecting part and the main rod part are arranged in sequence, and a threaded fastener is installed in the threaded hole, and the threaded fastener supports the metal beam connecting part.

[0017] Furthermore, a reserved groove is provided in the concrete slab, and the clamping portion of the sheared portion is located in the reserved groove.

[0018] Furthermore, the metal beam is an I-beam, which includes an upper flange, a lower flange and a web connecting the upper flange and the lower flange which are parallel to each other; the upper flange is the metal beam connecting portion; the second notch groove is formed on both sides of the upper flange; the first notch groove is formed on both sides of the embedded plate; and one shear connector is respectively provided on the corresponding two sides of the upper flange and the embedded plate.

[0019] Furthermore, the embedded plate is connected to a plurality of embedded anchors, and the embedded plate is connected to the concrete plate through the embedded anchors.

[0020] Furthermore, the metal beam is a steel beam.

[0021] Furthermore, the embedded plate is a steel plate.

[0022] The shear connector for composite beams and composite beams provided in the present application have the following beneficial effects:

[0023] The shear connector of the composite beam provided by the embodiment of the present invention can be effectively used for the connection of the composite beam. The connection of the composite beam specifically refers to the need to connect the first component to be connected and the second component to be connected. Specifically, since a plurality of shearing parts are provided on the main rod, the plurality of shearing parts can be connected to the first component to be connected (for example, an embedded plate connected to a concrete plate) respectively, and then the second component to be connected (for example, the metal beam mentioned later, especially the steel beam, I-beam beam) and the first component to be connected are limited between the main rod and the plurality of clamping parts through the main rod and the plurality of clamping parts, and the first component to be connected and the second component to be connected can be locked by installing threaded fasteners through the plurality of threaded holes on the main rod, without the need for on-site welding, and there will be no unstable welding quality. This integrated shear connector is more reliable and stable than the traditional method of connecting composite beams using a plurality of independent detachable bolt shear connectors and shear nails. Since the shear connector has a plurality of shearing parts, installing a connector is equivalent to installing a plurality of independent shear nails and bolts at the same time. Therefore, the on-site installation speed is improved and the construction efficiency is significantly improved.

[0024] In the composite beam provided by the embodiment of the present invention, the embedded plate and the metal beam connection part are limited between the main rod part and the clamping part of the sheared part, and the metal beam connection part is supported by a threaded fastener to achieve the locking of the embedded plate and the metal beam connection part. After loosening the threaded fastener, the main rod part of the shear connector can be easily disassembled and removed along the first notch groove and the second notch groove, so as to achieve the reuse of the concrete plate, the metal beam (such as a steel beam) and the shear connector. Compared with the existing welded shear studs, the installation of the shear connector provided by the embodiment of the present invention does not require an on-site welding process at the construction site. The concrete plate, the metal beam with the second notch groove, and the shear connector can be reused in different structures. In addition, by designing a large contact surface between the embedded plate and the concrete plate, the occurrence of local concrete crushing damage common in welded shear nails and detachable bolt shear connectors can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A perspective view of a shear connector for a composite beam provided in accordance with an embodiment of the present application;

[0027] Figure 2 A side view of a composite beam provided for one embodiment of the present application;

[0028] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0029] Figure 4 A perspective view of a composite beam provided for one embodiment of the present application;

[0030] Figure 5 for Figure 4 The enlarged view of point A in the middle;

[0031] Figure 6 A three-dimensional diagram of an embedded plate in a composite beam provided in one embodiment of the present application;

[0032] Figure 7 A three-dimensional diagram of a steel beam in a composite beam provided in one embodiment of the present application;

[0033] Figure 8 A schematic structural diagram of an embedded plate in a composite beam provided in an embodiment of the present application placed in a concrete casting mold frame;

[0034] Fig. 9 A finite element analysis model configuration diagram of a shear connector for a composite beam provided in one embodiment of the present application;

[0035] Fig.10 A simulation diagram of equivalent plastic strains of corresponding components in a composite beam provided in accordance with an embodiment of the present application.

[0036] The reference numerals in the above drawings are as follows:

[0037] 1-embedded anchor; 2-foam block; 3-concrete casting mold frame; 5-threaded fastener; 100-shear connector; 101-main rod; 102-extension; 103-clamp head; 104-threaded hole; 200-embedded plate; 201-first notch; 300-concrete plate; 301-reserved groove; 400-metal beam; 401-second notch; 402-upper flange; 403-lower flange; 404-web. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0039] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0040] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] In order to illustrate the technical solution described in this application, a detailed description is given below in conjunction with specific drawings and embodiments.

[0043] See also Figure 1 The embodiment of the present invention provides a shear connector 100 for a composite beam, which includes:

[0044] The main body rod 101 and multiple shearing parts integrally formed on the main body rod 101, the multiple shearing parts are arranged at intervals on the first side of the main body rod 101 along the length direction of the main body rod 101, and the multiple shearing parts can be arranged at equal or unequal intervals according to actual needs. The shearing parts include an extension part 102 connected to the first side of the main body rod 101 and a clamping part 103 located at one end of the extension part 102 away from the main body rod 101. Multiple threaded holes 104 can also be provided on the main body rod 101. The main body rod 101 has a second side opposite to the first side, and the threaded hole 104 runs through the first side and the second side.

[0045] See also Figure 1 and Figure 2 The shear connector 100 of the composite beam provided in the embodiment of the present invention can be effectively used for the connection of the composite beam. The connection of the composite beam specifically refers to the need to connect the first component to be connected and the second component to be connected. Specifically, since multiple shear portions are provided on the main rod 101, they can be connected to the first component to be connected (for example, the embedded plate 200 connected to the concrete plate 300) respectively, and then the second component to be connected (for example, the metal beam 400 mentioned later) and the first component to be connected are limited between the main rod 101 and the multiple clamping portions 103 through the main rod 101 and the multiple clamping portions 103, and the threaded fasteners 5 are installed by relying on the multiple threaded holes 104 on the main rod 101 to lock the first component to be connected and the second component to be connected. Compared with the traditional method of connecting composite beams using multiple independent detachable bolt shear connectors and shear nails, this integrated shear connector 100 has stronger reliability and stability.

[0046] However, it can be understood that the shear connector 100 for composite beams is not limited to being used only for connecting steel-concrete composite beams, but can also be used for connecting composite beams of other materials, or even for connecting other non-composite beams. As long as the shear connector 100 provided in this application is applied, it will fall within the scope of protection of the present invention.

[0047] According to an embodiment of the present invention, the cross-sectional dimension of the clamping portion 103 is greater than the cross-sectional dimension of the extending portion 102 , thereby facilitating the effective clamping of the clamping portion 103 with the component to be connected.

[0048] According to a preferred embodiment of the present invention, the shear connector 100 used for the composite beam is a corrosion-resistant member, for example, made of stainless steel or other materials.

[0049] See also Figure 1 According to a preferred embodiment of the present invention, threaded holes 104 are respectively provided on the outer sides of the two outermost shear parts along the length direction of the main rod 101, and a threaded hole 104 is provided between the two innermost shear parts along the length direction of the main rod 101. Of course, in order to improve the connection stability of the shear connector 100, threaded holes 104 can also be provided at more other positions along the length direction of the main rod 101.

[0050] See also Figures 2 to 7 In addition, the present invention further provides a composite beam, wherein the composite beam comprises the above-mentioned shear connector 100 for the composite beam, and the composite beam further comprises:

[0051] A plurality of embedded plates 200, wherein a first notch groove 201 is formed on the embedded plates 200;

[0052] A concrete slab 300 is connected to a plurality of embedded slabs 200, and the plurality of embedded slabs 200 are sequentially arranged at intervals along the concrete slab 300;

[0053] The metal beam 400 has a metal beam connection portion, and a second notch groove 401 is formed on the metal beam connection portion. The number of the second notch grooves 401 corresponds to the number of the plurality of embedded plates 200. The plurality of second notch grooves 401 are aligned with the first notch grooves 201. The position of the first notch groove 201 of the embedded plate 200 and the second notch groove 401 of the metal beam 400 correspond to the position of the sheared portion, so that the arrangement spacing of the plurality of sheared portions on the main rod portion 101 can be flexibly designed to match. For a composite beam designed to bear heavy loads, the sheared portions should be spaced narrowly, and all the first notch grooves 201 and the second notch grooves 401 should be used. For small load conditions, the spacing of the sheared portions can be designed to be larger, and only a portion of the first notch grooves 201 and the second notch grooves 401 should be used;

[0054] The extension portions 102 of each of the multiple sheared portions are located in the corresponding first notch grooves 201 and second notch grooves 401. The embedded plate 200 and the metal beam connecting portion are limited between the main rod portion 101 and the clamping portion 103 of the sheared portion. The clamping portion 103, the embedded plate 200, the metal beam connecting portion and the main rod portion 101 are arranged sequentially. A threaded fastener 5 is installed in the threaded hole 104. The threaded fastener 5 supports the metal beam connecting portion. The threaded fastener 5 can be a high-strength bolt.

[0055] In the composite beam, the embedded plate 200 and the metal beam connection part are limited between the main rod part 101 and the clamping part 103 of the sheared part, and the threaded fastener 5 is used to support the metal beam connection part to achieve the locking of the embedded plate 200 and the metal beam connection part. After loosening the threaded fastener 5, the main rod part 101 of the shear connector 100 can be easily disassembled and removed along the first notch groove 201 and the second notch groove 401, so that the concrete plate 300, the metal beam 400 (such as a steel beam) and the shear connector 100 can be reused. No on-site welding process is required at the construction site. Compared with the existing welded shear nails, the installation of the shear connector 100 provided by the embodiment of the present invention does not require on-site welding process. The concrete plate 300, the metal beam 400 with the second notch groove 401, and the shear connector 100 can be reused in different structures. In addition, by designing a large contact surface between the embedded plate 200 and the concrete plate 300, the occurrence of local concrete crushing damage common in welded shear nails and detachable bolt shear connectors can be avoided.

[0056] According to a preferred embodiment of the present invention, the shear connector 100 provided in the embodiment of the present invention is made of stainless steel, which can effectively avoid brittle fracture failure.

[0057] In addition, the spacing and size of the shearing parts of the shear connector 100 in the embodiment of the present invention can be flexibly designed according to different load amplitudes, and multiple shearing parts provide effective load transfer between the precast concrete slab and the channel steel beam.

[0058] The shear connector 100 with equidistant sheared portions is preferably used, which can be directly installed without a lot of repetitive work. Therefore, the construction time is greatly reduced. In addition, it is also preferred to use laser cutting or wire cutting technology to manufacture the shear connector 100. This ensures higher precision compared to on-site welding and bolt installation. Therefore, there are fewer problems associated with installation and the construction speed is increased.

[0059] See also Figures 3 to 5 as well as Figure 8 According to one embodiment of the present invention, a concrete slab 300 has a reserved groove 301, and the clamping portion 103 of the sheared portion is located between the reserved grooves 301. The reserved grooves 301 can be formed by pouring concrete on the embedded plate 200 to form the concrete slab 300. The embedded plate 200 is placed in a concrete pouring mold frame 3, and a suitable structure such as a foam block 2 is placed on the side of the first notch groove 201 of the embedded plate 200 corresponding to the side to be formed, and then concrete is poured in the concrete pouring mold frame 3. The position of the foam is not filled with concrete to form the required reserved groove 301.

[0060] According to one embodiment of the present invention, the metal beam 400 is an I-beam, which includes an upper flange 402, a lower flange 403 and a web 404 between the upper flange 402 and the lower flange 403. The upper flange 402 is the metal beam connecting portion mentioned above. A second notch groove 401 is formed on both sides of the upper flange 402, and a first notch groove 201 is formed on both sides of the embedded plate 200. A shear connector 100 is respectively provided on the corresponding sides of the upper flange 402 and the embedded plate 200. Of course, the metal beam 400 is not limited to an I-beam.

[0061] In addition, the embedded plate 200 is connected with a plurality of embedded anchors 1, such as embedded bolts, and the embedded plate 200 is connected to the concrete plate 300 through the embedded anchors 1. Of course, the embedded bolts may also be replaced by structures such as embedded shear nails.

[0062] According to a preferred embodiment of the present invention, the metal beam 400 is a steel beam, but is not limited to a steel beam. The embedded plate 200 is a steel plate, but is not limited to a steel plate, and the first notch groove 201 on the steel plate is formed by a simple cutting process. The foam block 2 is used to form the reserved groove 301 on the concrete plate 300, and the total manufacturing cost is not very high. Due to its superior structural performance, the embedded steel plate is slightly deformed during the longitudinal shear force transmission process. Thereby extending the service life of the prefabricated plate and ensuring reusability.

[0063] See also Fig. 9 and Fig.10 According to the push-out test setup recommended in Eurocode 3, Parts 1-8, a preliminary finite element analysis was performed on the shear connector 100 provided in the embodiment of the present invention. The configuration of the numerical model is as follows: Fig. 9 As shown in Figure 1. Symmetry constraints along the X and Z directions are applied. Fig.10 As shown, all relevant parts are included. Fig.10 The embedded steel plate is a specific embodiment of the embedded plate 200, and the grooved steel beam is a specific embodiment of the metal beam 400, and the vertical load based on displacement is applied from the top of the steel beam. From the deformation point of view, Fig.10 As shown, it can be found that a large equivalent plastic strain (PEEQ) occurs in the detachable connector, which is reasonable. Because compared with other components, the shear connector can be directly replaced. In addition, the longitudinal shear resistance (254.2 kN) of the detachable interlocking shear connection predicted in the finite element analysis is also higher than the design strength (180.4 kN) predicted in Part 1-8 of the European Standard 3. Therefore, through preliminary finite element analysis, it is proved that the shear connector 100 provided in the embodiment of the present application has good reliability when used as a connector for a composite beam.

[0064] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A shear connector for a composite beam, characterized in that: include: A main body rod and a plurality of shearing portions integrally formed on the main body rod, wherein the plurality of shearing portions are arranged at intervals on the first side surface of the main body rod along the length direction of the main body rod, the shearing portion comprises an extension portion connected to the first side surface of the main body rod and a clamping portion located at an end of the extension portion away from the main body rod, a plurality of threaded holes may also be provided on the main body rod, the main body rod has a second side surface opposite to the first side surface, and the threaded holes penetrate the first side surface and the second side surface.

2. The shear connector for composite beams according to claim 1, characterized in that: The cross-sectional dimension of the clamping portion is greater than the cross-sectional dimension of the extending portion.

3. The shear connector for composite beams according to claim 1, characterized in that: The shear connector for the composite beam is a corrosion-resistant part.

4. The shear connector for a composite beam according to any one of claims 1 to 3, characterized in that: The threaded holes are respectively arranged on the outer sides of the two outermost sheared parts along the length direction of the main body rod, and the threaded hole is arranged between the two innermost sheared parts along the length direction of the main body rod.

5. A composite beam, characterized in that: The composite beam comprises the shear connector for composite beams according to any one of claims 1 to 4, and the composite beam further comprises: A plurality of embedded plates, each of which has a first notch groove formed thereon; A concrete slab connected to the plurality of embedded slabs, wherein the plurality of embedded slabs are sequentially arranged at intervals along the concrete slab; A metal beam having a metal beam connecting portion, wherein a second notch groove is formed on the metal beam connecting portion, wherein the number of the second notch grooves corresponds to the number of the plurality of embedded plates, and the plurality of the second notch grooves are aligned with each of the first notch grooves; The extension portions of each of the multiple sheared parts are located in the corresponding first notch groove and second notch groove, the embedded plate and the metal beam connecting part are limited between the main rod part and the clamping part of the sheared part, the clamping part, the embedded plate, the metal beam connecting part and the main rod part are arranged in sequence, and a threaded fastener is installed in the threaded hole, and the threaded fastener supports the metal beam connecting part.

6. The composite beam according to claim 5, characterized in that: The concrete slab is provided with a reserved groove, and the clamping portion of the sheared portion is located in the reserved groove.

7. The composite beam according to claim 5, characterized in that: The metal beam is an I-beam, which includes an upper flange, a lower flange and a web connecting the upper flange and the lower flange, the upper flange being the metal beam connecting portion, the second notch groove being formed on both sides of the upper flange, the first notch groove being formed on both sides of the embedded plate, and a shear connector being respectively provided on the corresponding two sides of the upper flange and the embedded plate.

8. The composite beam according to any one of claims 5 to 7, characterized in that: The embedded plate is connected with a plurality of embedded anchors, and the embedded plate is connected to the concrete plate through the embedded anchors.

9. The composite beam according to any one of claims 5 to 7, characterized in that: The metal beam is a steel beam.

10. The composite beam according to any one of claims 5 to 7, characterized in that: The embedded plate is a steel plate.

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