A semi-circular corrugated tube confined concrete compression bar prestressed composite beam structure

Abstract

This utility model proposes a prestressed composite beam structure with semi-circular corrugated tube confined concrete compression members, belonging to the field of building beam structure technology. It includes a concrete top slab, with a concrete bottom slab at its base. Shear keys are respectively installed within the top and bottom slabs, and semi-circular corrugated tube confined concrete compression members connect the two opposing shear keys. Prestressed tendons, with both ends passing through the semi-circular corrugated tube confined concrete compression members, are anchored to the shear keys, connecting the semi-circular corrugated tube confined concrete compression members between the top and bottom slabs. Compared with traditional beam structures, this composite beam has a significantly improved load-bearing capacity, capable of withstanding greater loads without failure, while also exhibiting significantly enhanced stiffness and smaller deformation under load, effectively improving the safety and stability of the structure.

Description

Technical Field

[0001] This utility model relates to the field of building beam structure technology, and in particular to a prestressed composite beam structure with semi-circular corrugated tube confined concrete compression members. Background Technology

[0002] In the field of building engineering, beam structures are crucial components for bearing vertical loads. Traditional beam structures come in various forms, such as reinforced concrete beams, prestressed concrete beams, steel beams, and composite beams. Reinforced concrete beams have advantages such as wide availability of materials, relatively low cost, and good durability; however, they are heavy, and with large spans, the height and weight of the beam increase significantly, leading to increased material usage and a higher susceptibility to cracks and deformation, affecting the normal use and durability of the structure. Prestressed concrete beams, by pre-stressing the concrete, improve the crack resistance and stiffness of the component, reduce deformation, and can withstand larger loads, making them suitable for large-span structures. However, the construction process of prestressed concrete beams is relatively complex, requiring specialized tensioning equipment and anchorages, and controlling prestress loss is difficult; construction quality has a significant impact on structural performance. Steel beams have advantages such as light weight, high strength, and fast construction speed; however, steel beams have poor fire resistance and corrosion resistance, requiring corresponding protective measures and increasing project costs. In addition, steel beams are prone to local buckling under vertical loads, requiring structural measures such as stiffening ribs to improve their stability.

[0003] Composite beams combine the advantages of concrete and steel, typically consisting of a concrete slab and steel beams connected by shear connectors. The concrete slab bears compressive stress, while the steel beams bear tensile stress, fully utilizing the mechanical properties of both materials and offering advantages such as light weight, high strength, and high stiffness. However, existing composite beam structures still have some shortcomings in terms of load-bearing performance and construction technology. For example, some shear connectors in composite beams are prone to fatigue failure during long-term use, affecting the overall performance of the structure; some composite beams have complex construction, making construction difficult and increasing project costs and construction time. To further improve the mechanical performance, construction convenience, and economy of beam structures, a new type of beam structure needs to be developed. The semi-circular corrugated circular tube confined concrete compression bar prestressed composite beam structure proposed in this invention aims to solve the problems existing in existing beam structures. Through unique structural design and construction methods, it improves the load-bearing capacity, stiffness, and crack resistance of beams, while simplifying construction technology and reducing project costs. Utility Model Content

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, this invention proposes a prestressed composite beam structure with a semi-circular corrugated tube-confined concrete compression member.

[0005] The technical solution to the technical problem solved by this utility model is as follows: This utility model proposes a prestressed composite beam structure with semi-circular corrugated tube confined concrete struts, including a concrete top slab, with a concrete bottom slab spaced apart at the bottom of the top slab; several sets of shear keys, arranged opposite each other in the top and bottom slabs, with semi-circular corrugated tube confined concrete struts connecting the opposite shear keys; and several sets of prestressed tendons, each end of which freely passes through the semi-circular corrugated tube confined concrete struts and is anchored to the corresponding shear keys, connecting the semi-circular corrugated tube confined concrete struts between the top and bottom slabs.

[0006] Preferably, the semi-circular corrugated tube confined concrete compression bar includes several groups of vertically arranged semi-circular steel tubes, the semi-circular steel tubes are connected to short steel tubes, the semi-circular steel tubes and short steel tubes communicate to form a semi-circular corrugated tube, the interior of the semi-circular corrugated tube is filled with concrete to form a semi-circular corrugated tube confined concrete compression bar.

[0007] Preferably, several sets of shear keys are arranged at intervals along the longitudinal direction of the concrete top slab and are fixedly connected to the ends of the semi-circular corrugated pipes located on the top and bottom surfaces, respectively.

[0008] Preferably, the shear key includes a bottom steel plate fixed to the end of the semi-circular corrugated tube constrained concrete compression bar, with vertical steel plates fixed at both ends of the bottom steel plate; it also includes transverse vertical bars, which freely pass through the vertical steel plates and are placed inside the concrete bottom slab / concrete top slab.

[0009] Preferably, several groups of prestressed tendons are arranged longitudinally along the concrete top slab and correspond to the semi-circular corrugated tube confining the concrete compression bar; the ends of the prestressed tendons are respectively anchored to the shear key by means of anchorage.

[0010] Preferably, the prestressed tendon includes a first tendon bar and a second tendon bar, which are arranged in a cross pattern.

[0011] Preferably, the semi-circular corrugated tube confining concrete pressure bars are arranged at intervals along the transverse direction of the concrete top slab, with a quantity of 2-3 bars.

[0012] Preferably, the concrete top slab, concrete bottom slab, semi-circular corrugated tube confined concrete compression members, and prestressed tendons together form a space truss system; the concrete top slab is constructed as the upper chord of the space truss system, the concrete bottom slab is constructed as the lower chord of the space truss system, the semi-circular corrugated tube confined concrete compression members are constructed as the vertical compression members of the space truss structure, and the prestressed tendons are constructed as the diagonal web members of the space truss structure.

[0013] The above technical solution has the following advantages or beneficial effects: 1. In this invention, the concrete top and bottom slabs can withstand tensile and compressive forces respectively, the semi-circular corrugated tube confined concrete compression members can effectively transfer vertical loads, and the prestressed tendons are used to provide additional shear and bending resistance. Compared with traditional beam structures, the load-bearing capacity of this composite beam is significantly improved, capable of withstanding greater loads without failure, while its stiffness is also significantly enhanced, resulting in less deformation under load, effectively improving the safety and stability of the structure.

[0014] 2. In this utility model, the design of the semi-circular corrugated steel tube confined concrete compression bar provides effective restraint for the internal concrete. The semi-circular steel tubes are welded together to form the semi-circular corrugated tube, which restricts the lateral deformation of the concrete and prevents premature cracking and breakage during stress. In terms of construction, the semi-circular corrugated steel tube confined concrete compression bar is composed of several semi-circular steel tubes arranged vertically and welded together, with the interior filled with concrete. This construction method facilitates factory prefabrication and on-site installation, improving construction efficiency and shortening the construction cycle. Attached Figure Description

[0015] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0016] Figure 1 This is a transverse structural schematic diagram of the present invention.

[0017] Figure 2 This is a longitudinal structural diagram of the present invention.

[0018] Figure 3 This is a schematic diagram of the semi-circular corrugated tube confined concrete compression bar structure of this utility model.

[0019] Figure 4 This is a schematic diagram of the connection between the prestressed tendon and the shear key in this utility model.

[0020] Explanation of reference numerals in the attached figures: 1. Concrete top slab; 2. Concrete bottom slab; 3. Semi-circular corrugated tube confined concrete compression bar; 31. Semi-circular steel tube; 32. Short steel tube; 4. Prestressed tendon; 41. First tendon bar; 42. Second tendon bar; 5. Shear key; 51. Vertical steel plate; 52. Bottom steel plate; 53. Horizontal reinforcement; 6. Longitudinal direction; 7. Lateral direction; 8. Anchorage. Detailed Implementation To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] It should be noted that in the description of this utility model, the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0022] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] like Figures 1 to 4 As shown in the figure, this embodiment proposes a prestressed composite beam structure with semi-circular corrugated tube confined concrete compression members, which includes a concrete top slab 1 with embedded steel bars, and a concrete bottom slab 2 with embedded steel bars at intervals at the bottom of the concrete top slab 1. Several sets of shear keys 5 are arranged between the concrete bottom slab 2 and the concrete top slab 1. The shear keys are in the shape of "︺". The several sets of shear keys 5 are arranged at intervals along the longitudinal direction 6 of the concrete top slab 1, and the upper and lower shear keys 5 are arranged opposite each other. The two opposite shear keys 5 are connected together by a semi-circular corrugated tube confined concrete compression member 3.

[0024] It also includes several sets of prestressed tendons 4. The upper and lower ends of the prestressed tendons 4 pass freely through the semi-circular corrugated tube confined concrete pressure bar 3 and are anchored to the corresponding shear key 5, connecting the semi-circular corrugated tube confined concrete pressure bar 3 between the concrete top slab 1 and the concrete bottom slab 2.

[0025] The above structural layout enables the concrete top slab 1, concrete bottom slab 2, semi-circular corrugated tube confined concrete compression members 3, and prestressed tendons 4 to jointly form a spatial truss system. The concrete top slab 1 is constructed as the upper chord of the spatial truss system, the concrete bottom slab 2 is constructed as the lower chord of the spatial truss system, the semi-circular corrugated tube confined concrete compression members 3 are constructed as the vertical compression members of the spatial truss structure, and the prestressed tendons 4 are constructed as the diagonal web members of the spatial truss structure.

[0026] In the composite beam structure disclosed in this application, a concrete top slab 1, a bottom slab, a semi-circular corrugated tube confined concrete compression member 3, and prestressed tendons 4 constitute a spatial truss structure. This unique structural form allows each component to fully utilize its advantages. The concrete top slab 1 and bottom slab act as upper and lower chords, respectively, bearing tension and compression. The semi-circular corrugated tube confined concrete compression member 3 effectively transmits vertical loads as a vertical compression member, and the prestressed tendons 4 provide additional shear and bending resistance as diagonal web members. Compared with traditional beam structures, this composite beam has a significantly improved load-bearing capacity, capable of withstanding greater loads without failure. Simultaneously, its stiffness is significantly enhanced, resulting in less deformation under load, effectively improving the safety and stability of the structure.

[0027] refer to Figure 3 In this embodiment, the semi-circular corrugated tube confined concrete compression bar 3 includes several sets of vertically arranged semi-circular steel tubes 31. The semi-circular steel tubes 31 are connected to short steel tubes 32. The semi-circular steel tubes 31 and the short steel tubes 32 communicate to form a semi-circular corrugated tube. The interior of the semi-circular corrugated tube is filled with concrete to form the semi-circular corrugated tube confined concrete compression bar 3. Several sets of shear keys 5 are arranged longitudinally along the concrete top slab 1 and are fixedly connected to the ends of the semi-circular corrugated tubes located on the top and bottom surfaces, respectively.

[0028] In this design, the semi-circular corrugated steel tube confined concrete compression member 3 provides effective restraint for the internal concrete. The semi-circular steel tubes 31 are welded together to form the semi-circular corrugated tube, which restricts the lateral deformation of the concrete and prevents premature cracking and breakage during stress. This not only improves the compressive strength and durability of the concrete but also reduces the erosion of the concrete by external environmental factors, thereby extending the service life of the entire composite beam structure. In terms of construction, the semi-circular corrugated steel tube confined concrete compression member 3 is constructed by welding several semi-circular steel tubes 31 vertically, with the interior filled with concrete. This construction method facilitates factory prefabrication and on-site installation, improving construction efficiency and shortening the construction cycle.

[0029] Further reference Figure 1 or Figure 4In this embodiment, the shear key 5 includes a bottom steel plate 52 fixed to the upper and lower ends of the semi-circular corrugated tube-constrained concrete compression member 3, with vertical steel plates 52 fixed to both ends of the bottom steel plate 52; it also includes transverse reinforcing bars 53, which freely pass through the vertical steel plates 51 and are placed inside the concrete bottom slab 2 / concrete top slab 1. The design of this shear key 5 is simple and reasonable, and its connection with the semi-circular corrugated tube-constrained concrete compression member 3 and the concrete top and bottom slabs is reliable. The construction process is relatively simple, reducing construction difficulty and cost. Moreover, this composite beam structure fully utilizes the material properties of concrete and steel, and while meeting structural performance requirements, it can reasonably control material usage, reduce project costs, and has good economic efficiency.

[0030] In this embodiment, several sets of prestressed tendons 4 are arranged longitudinally along the concrete top slab and correspond to the semi-circular corrugated tube confined concrete compression members 3. The ends of the prestressed tendons 4 are anchored to shear keys 5 by means of anchorages 8. The design of the prestressed tendons being arranged longitudinally and corresponding to the semi-circular corrugated tube confined concrete compression members 3 and anchored to the shear keys 5 enables the prestressed tendons 4 to accurately assume the function of diagonal web members in the space truss. Together with the concrete top slab as the upper chord, the concrete bottom slab 2 as the lower chord, and the semi-circular corrugated tube confined concrete compression members 3 as vertical compression members, they form a complete force system, ensuring that each component is stressed in coordination, greatly improving the load-bearing capacity of the composite beam, and enabling it to withstand greater loads without easily failing.

[0031] refer to Figure 2 In this embodiment, the prestressed tendon 4 includes a first tendon bar 41 and a second tendon bar 42, which are arranged in a cross pattern. This cross arrangement creates a bidirectional oblique force-bearing system, capable of handling shear forces and torques in different directions. Regardless of the direction of the load, stress can be quickly transferred through the tendon bar in the corresponding direction, avoiding weak points under unidirectional stress and significantly improving the stability of the structure under complex stress conditions.

[0032] Furthermore, semi-circular corrugated tube confined concrete compression members 3 are spaced out along the transverse direction 7 of the concrete top slab, with 2-3 members in total. As vertical compression members of the space truss system, the core function of the semi-circular corrugated tube confined concrete compression members 3 is to transfer vertical loads to the concrete bottom slab 2. The transverse spacing of 2-3 members can evenly distribute the vertical load to multiple compression members according to the transverse width of the concrete top slab, avoiding load concentration in a localized area due to only one compression member. This prevents premature cracking or failure of the concrete top and bottom slabs due to excessive local stress, ensuring balanced stress across the entire transverse section.

[0033] Although the specific embodiments of the utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the utility model. Based on the technical solution of the utility model, various modifications or variations that can be made by those skilled in the art without creative effort are still within the scope of protection of the utility model.

Claims

1. A semi-circular wave shaped circular tube confined concrete compression strut pre-stressed composite beam structure, characterized in that, include: A concrete top slab (1) is provided at intervals at the bottom of the concrete top slab (1); Several sets of shear keys (5), the shear keys (5) are in the shape of "︺", the shear keys (5) are arranged opposite to each other in the concrete top plate (1) and the concrete bottom plate (2), and a semi-circular corrugated tube confining concrete pressure bar (3) is connected between the two opposite shear keys (5). Several sets of prestressed tendons (4) are freely passed through semi-circular corrugated tube confined concrete pressure bars (3) at both ends and then anchored to the corresponding shear keys (5), connecting the semi-circular corrugated tube confined concrete pressure bars (3) between the concrete top slab (1) and the concrete bottom slab (2).

2. A semi-circular wave shaped concrete filled tube (CFST) compression strut prestressed composite beam structure according to claim 1, characterized in that, The semi-circular corrugated tube confined concrete compression bar (3) includes several sets of vertically arranged semi-circular steel tubes (31), the semi-circular steel tubes (31) are connected to short steel tubes (32), the semi-circular steel tubes (31) and the short steel tubes (32) communicate to form a semi-circular corrugated tube, the interior of the semi-circular corrugated tube is filled with concrete to form a semi-circular corrugated tube confined concrete compression bar (3).

3. The prestressed composite beam structure with semi-circular corrugated tube confined concrete compression members according to claim 2, characterized in that, Several sets of shear keys (5) are arranged longitudinally along the concrete top slab (1) and are fixedly connected to the ends of the semi-circular corrugated pipes located on the top and bottom surfaces, respectively.

4. The prestressed composite beam structure with semi-circular corrugated tube confined concrete compression members according to claim 1, characterized in that, The shear key (5) includes a bottom steel plate (51) fixed to the end of the semi-circular corrugated pipe constrained concrete pressure bar (3), and vertical steel plates (52) are fixed at both ends of the bottom steel plate (51); it also includes a transverse steel bar (53), which freely passes through the vertical steel plate (52) and is placed in the concrete bottom plate (2) / concrete top plate (1).

5. The prestressed composite beam structure with semi-circular corrugated tube confined concrete compression members according to claim 1, characterized in that, Several sets of prestressed tendons (4) are arranged longitudinally along the concrete top slab (1) and correspond to the semi-circular corrugated pipe confined concrete pressure bar (3); the ends of the prestressed tendons (4) are respectively anchored to the shear key (5) by means of anchors (8).

6. A prestressed composite beam structure with semi-circular corrugated tube confined concrete compression members according to claim 5, characterized in that, The prestressed tendon (4) includes a first tendon bar (41) and a second tendon bar (42), which are arranged in a cross pattern.

7. The prestressed composite beam structure with semi-circular corrugated tube confined concrete compression members according to claim 1, characterized in that, The semi-circular corrugated tube confined concrete pressure bar (3) is arranged laterally along the concrete top plate (1) at intervals, with a quantity of 2-3.

8. The prestressed composite beam structure with semi-circular corrugated tube confined concrete compression members according to claim 1, characterized in that, The concrete top slab (1), concrete bottom slab (2), semi-circular corrugated tube confined concrete compression member (3), and prestressed tendon (4) together form a space truss system; the concrete top slab (1) is constructed as the upper chord of the space truss system, the concrete bottom slab (2) is constructed as the lower chord of the space truss system, the semi-circular corrugated tube confined concrete compression member (3) is constructed as the vertical compression member of the space truss structure, and the prestressed tendon (4) is constructed as the diagonal web member of the space truss structure.

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