Corrugated fitting type FRP member connecting node and connecting method

Abstract

This invention discloses a corrugated interlocking FRP component connection node and connection method, belonging to the field of civil engineering technology. The connection node includes an FRP component, steel fasteners, a structural adhesive layer, and high-strength bolts. The contact surfaces of the FRP component and the steel fasteners are both processed into matching corrugated interfaces. A structural adhesive layer is placed between the corrugated interfaces, and the connection is achieved through assembly with high-strength bolts. Compared to traditional adhesive-bolt hybrid connection nodes, this invention utilizes the corrugated interlocking interface to enhance the force transmission path. The corrugated interface extends the shear path of the adhesive layer and increases the effective bonding area. When the interface exhibits a relative slippage tendency, the corrugated interface provides anti-slip capability through the interlocking of crests and troughs. This results in a synergistic force transmission structure where corrugated interlocking, interface bonding, and bolt bearing work together, thereby reducing stress concentration at the hole edges and improving the stiffness, load-bearing capacity, and overall synergistic stress performance of the connection node.

Description

Technical Field

[0001] This invention relates to the field of civil engineering technology, specifically to a corrugated interlocking FRP component connection node and connection method, applicable to connection nodes in all FRP structures and FRP-metal composite structures. Background Technology

[0002] In fields such as marine engineering, bridge engineering, and new energy structures, traditional steel structures are prone to corrosion and degradation, leading to weakened cross-sections, reduced structural performance, increased maintenance costs, and shortened service life. Fiber-reinforced polymer (FRP) composites, with their advantages of being lightweight, high-strength, corrosion-resistant, and fatigue-resistant, have attracted widespread attention in recent years. Using FRP components to construct all-FRP structures or FRP-metal composite structures has become an important technical approach to achieving lightweight and durable structures.

[0003] However, the connection of FRP components is a critical weak point that determines the load-bearing capacity and safety of the structure. Existing FRP component connection methods mainly include mechanical connections, adhesive connections, and hybrid adhesive-bolt connections. Traditional bolted connections rely primarily on the bearing pressure at the bolt hole edge for force transmission, which easily leads to stress concentration in the FRP hole edge area, causing brittle failures such as edge crushing, delamination, and splitting. While simple adhesive bonding can improve the interface stress distribution, it suffers from problems such as interface peeling. Existing hybrid adhesive-bolt connections can improve connection performance to some extent, but in current technologies, the contact between FRP components and connectors is usually planar, resulting in a short interface force transmission path and limited interface anti-slip capacity, making it difficult to fully utilize the synergistic effect between the adhesive layer and the bolt. Therefore, improving the anti-slip capacity of the FRP component connection interface and enhancing the joint's collaborative load-bearing capacity are key technical problems that urgently need to be solved in current FRP connection technology. Summary of the Invention

[0004] The purpose of this invention is to provide a corrugated interlocking FRP component connection node and connection method. By setting a matching corrugated interface between the FRP component and the steel fastener, and combining it with an adhesive layer and high-strength bolts, a synergistic force transmission structure is formed with corrugated interlocking, interface bonding and bolt bearing, thereby improving the stiffness, load-bearing capacity and overall synergistic force performance of the FRP connection node, and reducing the risk of stress concentration and premature failure at the hole edge of the FRP component.

[0005] To solve the above problems, the present invention adopts the following technical solution: A corrugated interlocking FRP component connection node includes a first FRP component, a second component, a steel fastener, a structural adhesive layer, and high-strength bolts. The steel fastener is disposed between the first FRP component and the second component. Both the first FRP component and the second component are connected to the steel fastener through a corrugated interface, on which a structural adhesive layer is disposed. The first high-strength bolt passes through the steel fastener, the first structural adhesive layer, and the first FRP component in sequence and is fastened. The second high-strength bolt passes through the steel fastener, the second structural adhesive layer, and the second component in sequence and is fastened.

[0006] Furthermore, the corrugated interface is continuously distributed along the axial direction of the first FRP component and the second component, and is disposed in the contact area between the first FRP component and the second component and the steel fastener.

[0007] Furthermore, the crests and troughs of the corrugated interface interlock with each other to form a mechanical interlocking structure.

[0008] Furthermore, the structural adhesive layer fills the spaces between the interlocking corrugated interfaces and together with the high-strength bolts, forms a hybrid adhesive-bolt connection structure dominated by the corrugated interlocking interfaces.

[0009] Furthermore, the steel fastener is one of L-shaped, U-shaped, channel-shaped, or encased steel fasteners.

[0010] Furthermore, the first FRP component is one of an FRP channel component, an FRP I-beam component, or an FRP square tube component.

[0011] Furthermore, the second component is an FRP component or a metal component.

[0012] Furthermore, the second component is one of a channel-shaped component, an I-shaped component, or a square tube component. The connection method based on any of the above-mentioned corrugated interlocking FRP component connection nodes includes the following steps: A. Grind and clean the surface of the connection area between the first FRP component and the second component; B. Process a corrugated interface in the connection area between the first FRP component and the second component; C. A corrugated interface is machined on the corresponding contact surface of the steel fastener to fit into the first FRP component and the second component; D. Drill bolt holes at the corresponding positions of the first FRP component, the second component, and the steel fastener; E. Apply a structural adhesive layer between the corrugated interface of the first FRP component, the second component, and the steel fastener; F. Fit the first FRP component with the steel fastener and make the corrugated interface of the first FRP component and the steel fastener fit together; pass the first high-strength bolt through the first FRP component and the steel fastener and apply pre-tightening force to complete the connection assembly; G. Fit the second component with the steel fastener and make the corrugated interface of the second component and the steel fastener fit together; pass the second high-strength bolt through the second component and the steel fastener and apply pre-tightening force to complete the connection assembly.

[0013] Compared with the prior art, the present invention has the following beneficial effects: (1) By setting matching corrugated interfaces on the connection surfaces of the first FRP component and the second component with the steel fastener, when under stress, the load on the first FRP component is transmitted to the steel fastener through the corrugated interface, structural adhesive layer and high-strength bolts, and further transmitted to the second component. This can increase the effective contact area of ​​the interface and extend the force transmission path of the interface, thereby improving the force transmission efficiency of the interface. (2) The corrugated interface forms a mechanical interlocking effect between the crests and troughs, which can improve the interface's anti-slip ability and enhance the overall cooperative stress performance of the nodes. (3) Through the combined effects of corrugated fitting, interface bonding and bolt bearing, the stress concentration at the hole edge of FRP components and the risk of premature failure can be reduced, and the stiffness and bearing capacity of the joint can be improved. (4) This invention is applicable to connection nodes in all FRP structures and FRP-metal composite structures. Attached Figure Description

[0014] Figure 1 This is a rendering of the connection node of the corrugated interlocking FRP component of the present invention.

[0015] Figure 2 This is a structural schematic diagram of the connection node of a corrugated interlocking FRP component.

[0016] The labels in the diagram are as follows: 1—FRP component; 2—steel fastener; 3—high-strength bolt; 4—structural adhesive layer; 5—corrugated interface; 6—second component. Detailed Implementation

[0017] To further illustrate the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings, but these descriptions should not be construed as limiting the scope of protection of the present invention. Example 1

[0018] like Figure 1 and Figure 2 As shown, a corrugated interlocking FRP component connection node in this embodiment includes a first FRP component 1, a steel fastener 2, a high-strength bolt 3, a structural adhesive layer 4, a corrugated interface 5, and a second component 6.

[0019] The steel fastener 2 is disposed between the first FRP component 1 and the second component 6 to connect the two components. The steel fastener 2 has a first connecting surface and a second connecting surface. The first connecting surface is perpendicularly connected to the outer surface of the first FRP component 1, and the second connecting surface is perpendicularly connected to the outer surface of the second component 6. Both the first FRP component 1 and the second component 6 are channel-shaped components. The contact area between the first connecting surface of the first FRP component 1 and the steel fastener 2 is machined to form a matching first corrugated interface 5, and the contact area between the second connecting surface of the second component 6 and the steel fastener 2 is machined to form a matching second corrugated interface. A structural adhesive layer 4 is filled between the first corrugated interface 5 and the second corrugated interface. A first high-strength bolt 3 passes sequentially through the steel fastener 2, the first structural adhesive layer, and the first FRP component 1, and is then tightened. A second high-strength bolt passes sequentially through the steel fastener 2, the second structural adhesive layer, and the second component 6, and is then tightened, thereby connecting the first FRP component 1, the steel fastener 2, and the second component 6 into a whole.

[0020] Under stress, the load on FRP component 1 is transferred to steel fastener 2 through corrugated interface 5, structural adhesive layer 4, and high-strength bolts 3, and further transferred to the second component 6. The corrugated interface 5 forms a mechanical interlock through the interlocking action between the crests and troughs, which further forms an anti-slip constraint on the interface in addition to the shear force provided by the adhesive layer 4; at the same time, the high-strength bolts 3 provide the node fastening force and bear the bolt bearing pressure, thus forming a synergistic force transmission structure with the combined action of corrugated interlocking, interface bonding, and bolt bearing pressure.

[0021] In this embodiment, the first FRP component 1 is an FRP channel-shaped component. In other embodiments, the first FRP component 1 may also be an FRP I-shaped component or an FRP square tube component. In this embodiment, the steel fastener 2 is an L-shaped component, and the two outer sides of the L-shaped component form a first connecting surface and a second connecting surface. In other embodiments, the steel fastener 2 may also be a U-shaped or covered steel connector. In this embodiment, the second component 6 is a channel-shaped FRP component. In other embodiments, the second component 6 may also be an I-shaped or square tube FRP component, or a channel-shaped, I-shaped, or square tube metal component. Example 2

[0022] The connection method for a corrugated interlocking FRP component connection node according to Embodiment 1 includes the following steps: A. Grind and clean the surface of the connection area between the first FRP component 1 and the second component 6; B. Process a corrugated interface in the connection area between the first FRP component 1 and the second component 6; C. A corrugated interface is machined on the corresponding contact surface of the steel fastener 2 to fit into the first FRP component 1 and the second component 6. D. Drill bolt holes at the corresponding positions of the first FRP component 1, the second component 6 and the steel fastener 2; E. Apply a structural adhesive layer between the corrugated interface of the first FRP component and the second component 6 and the steel fastener 2. F. Fit the first FRP component 1 and the steel fastener 2 together, and make the corrugated interface of the first FRP component 1 and the steel fastener 2 fit together; pass the first high-strength bolt through the first FRP component and the steel fastener and apply pre-tightening force to complete the connection assembly; G. Fit the second component 6 with the steel fastener 2 and make the corrugated interface of the second component and the steel fastener fit together; pass the second high-strength bolt through the second component and the steel fastener and apply pre-tightening force to complete the connection assembly.

[0023] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also within the protection scope of the present invention.

Claims

1. A corrugated interlocking FRP component connection node, characterized in that, It includes a first FRP component, a second component, a steel fastener, a structural adhesive layer, and high-strength bolts; the steel fastener is disposed between the first FRP component and the second component, and the first FRP component and the second component are connected to the steel fastener through a corrugated interface, on which a structural adhesive layer is disposed; the first high-strength bolt passes through the steel fastener, the first structural adhesive layer, and the first FRP component in sequence, and is fastened; the second high-strength bolt passes through the steel fastener, the second structural adhesive layer, and the second component in sequence, and is fastened.

2. The corrugated interlocking FRP component connection node according to claim 1, characterized in that, The corrugated interface is continuously distributed along the axial direction of the first FRP component and the second component, and is disposed in the contact area between the first FRP component and the second component and the steel fastener.

3. The corrugated interlocking FRP component connection node according to claim 1, characterized in that, The crests and troughs of the corrugated interface interlock with each other to form a mechanical interlocking structure.

4. The corrugated interlocking FRP component connection node according to claim 1, characterized in that, The structural adhesive layer fills the spaces between the interlocking corrugated interfaces and together with the high-strength bolts, forms a hybrid adhesive-bolt connection structure dominated by the corrugated interlocking interfaces.

5. A corrugated interlocking FRP component connection node according to claim 1, characterized in that, The steel fastener is one of L-shaped, U-shaped, channel-shaped, or encased steel fasteners.

6. A corrugated interlocking FRP component connection node according to claim 1, characterized in that, The first FRP component is one of FRP channel component, FRP I-beam component, or FRP square tube component.

7. A corrugated interlocking FRP component connection node according to claim 1, characterized in that, The second component is an FRP component or a metal component.

8. A corrugated interlocking FRP component connection node according to claim 7, characterized in that, The second component is one of the following: a channel-shaped component, an I-shaped component, or a square tube component.

9. A connection method based on the corrugated interlocking FRP component connection node according to any one of claims 1 to 8, characterized in that, Includes the following steps: A. Grind and clean the surface of the connection area between the first FRP component and the second component; B. Process a corrugated interface in the connection area between the first FRP component and the second component; C. A corrugated interface is machined on the corresponding contact surface of the steel fastener to fit into the first FRP component and the second component; D. Drill bolt holes at the corresponding positions of the first FRP component, the second component, and the steel fastener; E. Apply a structural adhesive layer between the corrugated interface of the first FRP component, the second component, and the steel fastener; F. Fit the first FRP component with the steel fastener and make the corrugated interface of the first FRP component and the steel fastener fit together; pass the first high-strength bolt through the first FRP component and the steel fastener and apply pre-tightening force to complete the connection assembly; G. Fit the second component with the steel fastener and make the corrugated interface of the second component and the steel fastener fit together; pass the second high-strength bolt through the second component and the steel fastener and apply pre-tightening force to complete the connection assembly.

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