Composite beam reinforced by groove-shaped UHPC (Ultra High Performance Concrete)
By stuck grooves on the concrete surface of the combination beam and pour the UHPC reinforcement layer to form a reinforced system, it solves the problem of cracking and rust of the bridge surface, and realizes the combination beam with high load capacity and crack resistance.
Patent Information
- Application Number
- CN202310923358.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-07-25
- Publication Date
- 2025-01-28
AI Technical Summary
In the negative bending moment zone of continuous combined beam bridges, bridge deck cracking caused by concrete is frequently caused by tension, and bridge deck steel bars are seriously corroded, affecting the safety and durability of the bridge.
A new type of combination beam with groove -like UHPC reinforcement, rectangular grooves and cutting hair processing on the concrete plate surface, and then poured the UHPC reinforcement layer to form a reinforcement system to improve the resistance of anti -slip.
The high carrier capacity, good crack resistance and good mechanical properties have been achieved, while reducing construction difficulty and material dosage, and ensuring the adhesion between the UHPC reinforcement layer and the ordinary concrete board.
Smart Images
Figure CN119372993A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a novel steel-concrete composite beam reinforced by using grooved UHPC. Background Art
[0002] Steel-concrete composite beam bridges are rapidly being used in new highway bridges due to their advantages such as light weight, strong spanning capacity, high bearing capacity, good ductility, and significant comprehensive technical and economic benefits. However, in the negative bending moment area of continuous composite beam bridges, bridge deck cracking caused by tensile concrete occurs frequently. Under the long-term effects of loads and adverse environments, the steel bars on the bridge deck are severely corroded, affecting the safety and durability of the bridge.
[0003] UHPC is a material with ultra-high strength and durability. Because it contains steel fibers and active components, its tensile toughness and resistance to adverse environmental erosion are better than ordinary concrete. Therefore, the use of UHPC thin layers to replace the ordinary concrete surface layer in the negative bending moment area to form a UHPC-ordinary concrete composite bridge deck not only reduces the amount of materials used and has controllable costs, but also delays cracking because the ordinary concrete base is close to the plastic neutral axis of the composite beam, and the UHPC surface layer is located in the most unfavorable tensile zone, which can give full play to the high tensile toughness of the material, improve the anti-cracking performance of the bridge deck and enhance the overall durability.
[0004] Therefore, in order to solve these problems, the present invention proposes a new composite beam reinforced with grooved UHPC. Summary of the invention
[0005] In view of the property problems caused by different reinforcement interface methods, the present invention proposes a new composite beam reinforced with grooved UHPC, which can reduce the construction difficulty and make the mechanical properties of the composite beam have sufficient reliability.
[0006] The present invention is achieved through the following technical solutions:
[0007] A composite beam reinforced with grooved UHPC includes a steel beam, studs, a concrete slab, a UHPC reinforcement layer, and distributed steel bars. A rectangular groove is cut out on the concrete slab surface and the concrete slab surface is roughened before pouring the UHPC reinforcement layer. The reinforced layer steel bars and the concrete slab steel bars form a reinforcement system inside the composite beam concrete slab and the UHPC reinforcement layer.
[0008] As a preferred solution, the UHPC reinforcement layer is specifically of RPC120 strength grade in the "Reactive Powder Concrete" (GB / T 31387-2015) specification.
[0009] As a preferred solution, the rectangular groove on the concrete slab surface improves the strength and bearing capacity of the composite beam and the anti-slip performance of the interface between the concrete slab and the UHPC reinforcement layer.
[0010] As a preferred solution, the concrete slab surface is roughened.
[0011] The implementation of the present invention has the following beneficial effects:
[0012] 1. High bearing capacity, good crack resistance and good mechanical properties.
[0013] 2. The construction is simple, the amount of concrete used is small and the cost is controllable.
[0014] 3. Under the premise of ensuring the strength, stiffness and stability of the composite beam, the bonding between the UHPC reinforcement layer and the ordinary concrete slab is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is an overall three-dimensional model diagram of the new composite beam of the present invention.
[0016] Figure 2 It is a cross-sectional view of the novel composite beam of the present invention.
[0017] Figure 3 This is the interface diagram of the new composite beam concrete slab and UHPC reinforcement layer of the present invention. DETAILED DESCRIPTION
[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below with reference to the accompanying drawings.
[0019] like Figure 1-3 As shown, a new type of grooved UHPC reinforced composite beam comprises a concrete slab 1, a steel beam 2, a UHPC reinforcement layer 3, reinforcement layer steel bars 4, concrete slab steel bars 5 and studs 6, wherein the studs 6 are welded to the upper flange of the steel beam 2 as shear connectors, and the concrete slab steel bars 5 and the reinforcement layer steel bars 4 are arranged in the concrete slab 1 and the UHPC reinforcement layer 3 respectively.
[0020] The UHPC reinforcement layer 3 is specifically of RPC120 strength grade in the "Reactive Powder Concrete" (GB / T 31387-2015) specification.
[0021] The UHPC reinforcement layer 3 is poured after the rectangular groove is chiseled and roughened in the concrete slab 1 , so that the UHPC reinforcement layer 3 is completely joined with the groove of the concrete slab 1 .
[0022] The concrete slab 1 is located on the steel beam 2, and the studs 6 are welded to the upper flange of the steel beam 2 and connected to the concrete slab 1 to form a shear connector.
[0023] The composite beam concrete slab 1 and the UHPC reinforcement layer 3 have a reinforcement system formed by the reinforcement layer steel bars 4 and the concrete slab steel bars 5 .
[0024] It should be noted that the present invention is a new type of steel-concrete composite beam reinforced with grooved UHPC. When it is used in bridge engineering, the internal structural parameters used in different projects are different. The size of the steel beam 2, the thickness of the concrete slab 1, the thickness of the UHPC reinforcement layer 3, the steel fiber content, the diameter of the reinforcement layer steel bar 4, the concrete slab steel bar 5, etc. can be determined according to the specific project.
[0025] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.
Claims
1. A novel composite beam reinforced with grooved UHPC, comprising a concrete slab 1, a steel beam 2, a UHPC reinforcement layer 3, reinforcement layer steel bars 4, concrete slab steel bars 5 and studs 6, wherein the studs 6 are welded to the upper flange of the steel beam 2 as shear connectors, and the concrete slab steel bars 5 and the reinforcement layer steel bars 4 are arranged in the concrete slab 1 and the UHPC reinforcement layer 3, respectively.
2. The novel composite beam reinforced with grooved UHPC according to claim 1, characterized in that: The concrete slab 1 is located on the steel beam 2, and the studs 6 are welded to the upper flange of the steel beam 2 and connected to the concrete slab 1 to form a shear connector.
3. The novel composite beam reinforced with grooved UHPC according to claim 1, characterized in that: After the rectangular grooves are chiseled and the roughening process is completed on the concrete slab 1 , the UHPC reinforcement layer 3 is poured, so that the UHPC reinforcement layer 3 is completely joined to the grooves of the concrete slab 1 .
4. The novel composite beam reinforced with grooved UHPC according to claim 1, characterized in that: The concrete slab 1 is specifically of strength grade C50 in the Code for Design of Concrete Structures (GB 50010-2010).
5. The novel composite beam reinforced with grooved UHPC according to claim 1, characterized in that: The UHPC reinforcement layer 3 is specifically of RPC120 strength grade in the "Reactive Powder Concrete" (GB / T 31387-2015) specification.
6. The novel composite beam reinforced with grooved UHPC according to claim 1, characterized in that: The composite beam concrete slab 1 and the UHPC reinforcement layer 3 have a reinforcement system formed by the reinforcement layer steel bars 4 and the concrete slab steel bars 5 .