A marine composite sandwich panel connection mechanism supported by I-beams

Abstract

The present invention relates to the technical field of ship heterogeneous material connection, and discloses a ship composite sandwich panel connection mechanism supported by an I-beam, comprising a steel connection mechanism, a composite sandwich panel structure, an I-beam, ceramic wool and a thin steel plate. The steel connection structure is arranged at a full-gear or half-gear strong frame, with the composite sandwich panels connected on the left and right sides, the I-beam connected at the bottom, and ceramic wool and a thin steel plate connected on the outside to improve the fire protection level. The present invention adopts a pre-embedded and welded method to connect the composite sandwich panel and the steel structure, and optimizes the shear stress at the traditional connection interface to be the main stress and stress concentration to surface contact and line contact, which significantly reduces the stress concentration degree and improves the safety of the overall structure. It solves the problems of low load transfer efficiency, poor deformation coordination, insufficient connection strength, etc. existing in conventional connection technologies, and is suitable for connection scenarios where composite sandwich panels and steel structures have high connection strength requirements.

Description

Technical Field

[0001] This invention relates to the field of marine heterogeneous material connection technology, specifically to a marine composite sandwich panel connection mechanism supported by I-beams. Background Technology

[0002] Composite sandwich panel structures, with their superior advantages such as light weight, high specific strength, strong buckling resistance, vibration reduction, sound insulation, and corrosion resistance, are widely used in many fields such as aviation, aerospace, shipbuilding, automotive, and construction. Replacing traditional steel superstructures with composite sandwich panel structures in ships effectively reduces weight and lowers the ship's center of gravity, improving navigational stability. However, when using composite sandwich panels, connections to the main hull steel structure are unavoidable. Due to differences in material properties, stress concentration can occur in the connection area, potentially leading to failure at the connection point. If the sandwich panel bears a large load, more of the load will be transferred to the connection mechanism. Therefore, for applications requiring high connection strength, employing a reasonable connection mechanism is crucial to ensuring the overall structural safety and reliability.

[0003] Traditional methods to improve connection strength involve thickening the core layer in the connection area or pre-embedding a core structure with a higher elastic modulus, then connecting the composite sandwich panel to the steel deck via mechanical or adhesive connections. Mechanical connections primarily use bolts, which offer advantages such as easy assembly, disassembly, and maintenance. However, the load-bearing capacity of the sandwich panel structure is significantly reduced by the presence of bolts, and under large preload, the sandwich panel is prone to tearing due to insufficient load-bearing strength. While adhesive bonding offers strong shear resistance in certain directions, it has poor peel resistance, easily leading to undetectable delamination, layer / plate separation, and ultimately structural failure. Pre-embedding metal structures or structures with a higher elastic modulus into the composite material can improve connection strength, but since the embedded parts are not directly connected to the external steel structure, stress concentration still occurs at the interface where the connecting bolts penetrate the sandwich panel surface skin and the embedded parts. Therefore, it is not suitable for applications requiring high connection strength. Furthermore, the design thickness of the sandwich panel and the through-bolt connection method limit the applicability of pre-embedded designs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the existing marine composite sandwich panel connection method has low strength and is prone to deformation and damage.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is to provide a marine composite sandwich panel connection mechanism supported by an I-beam, comprising a steel connection structure, a composite sandwich panel structure, and an I-beam. The composite sandwich panel structure connects both sides of the steel connection structure, and the I-beam is connected to the bottom of the steel connection structure, forming a symmetrical structure. The steel connection structure includes a vertical support plate and steel pipes. Steel pipes are arranged on both sides of the vertical support plate. The composite sandwich panel structure is connected to the steel pipes, and the I-beam is connected to the bottom of the vertical support plate.

[0006] Optionally, the vertical support plate includes a left vertical support plate and a right vertical support plate, both of which have the same structure and are symmetrically arranged. The left vertical support plate and the right vertical support plate are welded together. A protrusion is provided in the middle of the side of the left vertical support plate and the right vertical support plate opposite to the connection point, and the steel pipe is welded to the protrusion.

[0007] Optionally, reinforcing elbows are provided on both sides of the connection between the left and right vertical support plates, and a connecting structure panel is welded above the left and right vertical support plates.

[0008] Optionally, the steel pipe is a slanted D-shaped steel pipe, including a left slanted D-shaped steel pipe and a right slanted D-shaped steel pipe, both of which have the same structure. The left slanted D-shaped steel pipe is welded to the left vertical support plate, and the right slanted D-shaped steel pipe is welded to the right vertical support plate.

[0009] Optionally, the left-sloping D-shaped steel pipe includes an upper horizontal surface, a vertical surface, a lower horizontal surface, and a sloping side surface, which are connected to each other by arc surfaces. The thickness of the vertical surface and the arc surface at its connection with the upper and lower horizontal surfaces is greater than the thickness of the other surfaces. The protrusion of the left vertical support plate is welded to the vertical surface.

[0010] Optionally, the composite sandwich panel structure includes an upper skin, a lower skin, and multiple core materials. The core materials are trapezoidal hollow tubes, and the core materials are bonded to each other. The oblique side of the left-sloping D-shaped steel tube is bonded to the adjacent core material. The upper skin and lower skin cover the core material and the upper and lower sides of the left-sloping D-shaped steel tube, as well as the vertical surface of the left-sloping D-shaped steel tube, respectively, and leave notches corresponding to the protrusions on the vertical surface.

[0011] Optionally, the upper surface of the connecting structure panel of the steel connecting mechanism is flush with the upper surface of the upper skin.

[0012] Optionally, the I-beam includes an upper I-beam panel, a lower I-beam panel, and an I-beam web. The web of the I-beam is provided with symmetrically arranged lateral reinforcing elbows on both sides. The upper I-beam panel is welded to the vertical support plate of the steel connecting structure, and the width of the upper I-beam panel is greater than the width of the steel connecting structure.

[0013] Optionally, the reinforcing elbow plate and the web of the I-beam are located in the same plane.

[0014] Optionally, the composite sandwich panel structure has an upper ceramic cotton on the upper skin and a lower ceramic cotton on the lower skin. An upper thin steel plate is provided outside the upper ceramic cotton and a lower thin steel plate is provided outside the lower ceramic cotton. The upper thin steel plate is connected to the connecting structure panel by bolts, and the lower thin steel plate is welded to the upper panel of the I-beam.

[0015] In summary, the present invention has at least one of the following beneficial effects:

[0016] 1. This invention involves welding a slanted D-shaped steel pipe to a vertical support plate, which is then pre-embedded at the end of a composite sandwich panel as the core material. A rigid connection between the two sandwich panels is achieved by welding the vertical support plate, and the connection between the vertical support plate and the I-beam is achieved through steel fillet welds. Steel welding replaces the mechanical connection and bonding methods of composite materials, optimizing the stress concentration at the traditional connection interface from shear stress to surface and line contact. This significantly reduces stress concentration, improves the overall structural safety, and solves problems such as low load transfer efficiency, poor deformation coordination, and insufficient connection strength inherent in conventional connection technologies. It is suitable for connection scenarios where high connection strength is required between composite sandwich panels and steel structures.

[0017] 2. The present invention rounds and thickens the inner ring of the steel structure and composite sandwich panel in the connection area, which can further improve the connection strength.

[0018] 3. The present invention uses isosceles trapezoidal hollow tubes as the core material of sandwich panels, which not only significantly improves the bending and shear resistance of sandwich panel structures, but also saves on pipe support brackets.

[0019] 4. The laying of ceramic cotton in this invention improves the flame retardancy of the sandwich panel structure, making it suitable for buildings with higher fire protection requirements. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 for Figure 1 Schematic diagram of a D-shaped steel section with a central inclination;

[0022] Figure 3 This is an exploded view of the structure of the present invention;

[0023] Figure 4 This is an exploded view of another embodiment of the present invention;

[0024] Figure 5 for Figure 1 AA cross-section view;

[0025] In the diagram: 1. Steel connecting mechanism; 11. Left vertical support plate; 12. Right vertical support plate; 13. Left inclined D-shaped steel pipe; 131. Upper horizontal plane; 132. Lower horizontal plane; 133. Vertical plane; 134. Inclined side; 14. Right inclined D-shaped steel pipe; 15. Connecting mechanism panel; 16. Reinforcing elbow plate; 17. Bolt; 2. Composite material sandwich panel structure; 21. Upper skin; 22. Lower skin; 23. Core material; 3. I-beam; 31. I-beam upper panel; 32. I-beam web; 33. I-beam lower panel; 34. I-beam reinforcing elbow plate; 41. Upper ceramic wool; 42. Lower ceramic wool; 51. Upper thin steel plate; 52. Lower thin steel plate. Detailed Implementation

[0026] The following combination Figure 1-5 The present invention will be described in further detail below.

[0027] This invention discloses a connection mechanism for marine composite sandwich panels supported by I-beams, with reference to... Figure 1 and Figure 5 The structure includes a steel connecting structure 1, a composite sandwich panel structure 2, and an I-beam 3. The steel connecting structure 1 is arranged at the full or half of the strong frame. When subjected to a large load, the steel connecting structure 1 can be densely arranged at the half of the strong frame to improve the safety of the overall structure. The composite sandwich panel structure 2 connects the two sides of the steel connecting structure 1, and the I-beam 3 is connected to the bottom of the steel connecting structure 1. The three form a symmetrical structure. The steel connecting structure 1 includes a vertical support plate and steel pipes. Steel pipes are set on both sides of the vertical support plate. The composite sandwich panel structure 2 is connected to the steel pipes. The I-beam 3 is connected to the bottom of the vertical support plate. The I-beam 3 is used to replace the deck and steel longitudinal girder or strong transverse beam. It is the main load-bearing structure and provides support for the composite sandwich panel structure 2 and the steel connecting structure 1.

[0028] In a further implementation, refer to Figure 3 The vertical support plates include a left vertical support plate 11 and a right vertical support plate 12, both of which have the same structure and are symmetrically arranged. The left vertical support plate 11 and the right vertical support plate 12 are welded together. A protrusion is provided in the middle of the side opposite to the connection point on the left vertical support plate 11 and the right vertical support plate 12. A steel pipe is welded to the protrusion. On the one hand, this ensures the structural integrity of the sandwich panel skin at the turning point as much as possible, and on the other hand, it leaves a certain amount of construction space. The outer side of the vertical support plate is appropriately rounded to alleviate stress concentration. The two vertical support plates are joined together in the middle. The bottom is welded to the upper panel 31 of the I-beam, and the top is welded to the connecting structure panel 15. Reinforcing elbow plates 16 are provided on both sides of the connection point of the left vertical support plate 11 and the right vertical support plate 12. The connecting structure panel 15 is welded above the left vertical support plate 11 and the right vertical support plate 12.

[0029] Another feasible solution is to refer to Figure 4The oblique D-shaped steel pipe and the shoulder of the vertical support plate are welded into a whole and directly pre-embedded in the composite sandwich panel structure 2. The cross-section of the vertical support plate exposes the fiber-reinforced skin, which becomes the boundary hard line of the sandwich panel, and then it is welded with other vertical support plates.

[0030] In a further implementation, refer to Figure 2 The steel pipe is a slanted D-shaped steel pipe, including a left slanted D-shaped steel pipe 13 and a right slanted D-shaped steel pipe 14. The two have the same structure. The left slanted D-shaped steel pipe 13 is welded to the left vertical support plate 11, and the right slanted D-shaped steel pipe 14 is welded to the right vertical support plate 12. Taking the left slanted D-shaped steel pipe 13 as an example, the left slanted D-shaped steel pipe 13 includes an upper horizontal surface 131, a vertical surface 133, a lower horizontal surface 132, and a slanted side surface 134. The surfaces are connected by arc surfaces. It can be rolled into shape in one step or welded after bending a flat plate. The manufacturing process is simple. The protrusion of the left vertical support plate 11 is welded to the vertical surface 133.

[0031] The following design measures are taken for the left-sloping D-shaped steel pipe 13 to improve the load transfer efficiency and deformation coordination between heterogeneous structures: First, the inner ring of the contact area with the composite sandwich panel structure 2 is thickened to improve the connection strength. The thickened area mainly includes the vertical surface 133 and the first arc surface R1 and the second arc surface R2 at the connection with the upper horizontal surface 131 and the lower horizontal surface 132. Second, the outer ring is ensured to fit tightly with the composite sandwich panel structure 2. The inclination angle of the inclined side 134 should be the same as the inclination angle of the web of the core material 23 of the sandwich panel. In addition, the outer surfaces of the upper horizontal surface 131 and the lower horizontal surface 132 should be appropriately tapered inward to reserve space for the local thickening of the skin 21 and the lower skin 22 on the sandwich panel.

[0032] In a further embodiment, the composite sandwich panel structure 2 includes an upper skin 21, a lower skin 22, and multiple core materials 23, all made of resin-based reinforced fiber laminate. The core materials 23 are trapezoidal hollow tubes, and the core materials 23 are staggered and bonded together. The core materials 23 are bonded to the upper skin 21 and the lower skin 22. The inclined side 134 of the left-sloping D-shaped steel tube 13 is bonded to the adjacent core material 23. The inclination angle of the inclined side 134 is the same as the inclination angle of the web of the core material 23. The upper skin 21 and the lower skin 22 are horizontally aligned and respectively cover the core material 23 and the left-sloping D-shaped steel tube 13. The upper and lower sides of the steel pipe 13 and the vertical surface 133 of the left inclined D-shaped steel pipe 13 are connected as one body, and the corners are rounded. The inner circle of the area in contact with the inclined D-shaped steel pipe is thickened, and a notch corresponding to the protrusion is left on the vertical surface 133. The upper surface of the connecting structure panel 15 of the steel connecting mechanism 1 is flush with the upper surface of the upper skin 21 to ensure the flatness of the structure. In addition, an inclined D-shaped steel pipe is provided at each end of the composite sandwich panel structure 2 to serve as the steel core material. The inclined D-shaped steel pipe and the composite sandwich panel structure 2 are in surface contact, which can fully improve the stress distribution between layers.

[0033] Specifically, using isosceles trapezoidal hollow tubes as core material 23 not only significantly improves the bending and shear resistance of the composite sandwich panel structure 2 under the same weight, but also allows for the pre-embedding of cable conduits, thus saving on bracket structures; the upper skin 21 and lower skin 22 are connected as a whole to ensure the structural integrity of the skin as much as possible, and the corners are rounded off; the inner ring of the contact area with the left inclined D-shaped steel pipe 13 and the right inclined D-shaped steel pipe 14 is thickened.

[0034] In a further embodiment, the I-beam 3 includes an upper I-beam panel 31, a lower I-beam panel 33, and an I-beam web 32. The web 32 has symmetrically arranged lateral reinforcing elbows 34 on both sides. The components are connected by fillet welds. The upper I-beam panel 31 is welded to the vertical support plate of the steel connection structure 1, and the width of the upper I-beam panel 31 is greater than the width of the steel connection structure 1. The reinforcing elbows 16 and the web 32 are located in the same plane to improve the strength and stability of the steel connection mechanism 1.

[0035] In a further embodiment, the upper ceramic cotton 41 is provided above the upper skin 21 of the composite sandwich panel structure 2, and the lower ceramic cotton 42 is provided below the lower skin 22. The upper ceramic cotton 41 is provided with an upper thin steel plate 51, and the lower ceramic cotton 42 is provided with a lower thin steel plate 52. The upper thin steel plate 51 is connected to the connecting structure panel 15 by bolts 17, and the lower thin steel plate 52 is welded to the upper panel 31 of the I-beam. The protection level of the upper ceramic cotton 41 and the lower ceramic cotton 42 is at least A15, and the thickness of the upper thin steel plate 51 and the lower thin steel plate 52 is 0.2 to 0.5 mm, which will not add too much weight.

[0036] This invention involves welding a slanted D-shaped steel pipe to a portion of a vertical support plate, which is then pre-embedded at the end of the composite sandwich panel structure 2 as the core material. A rigid connection between the two sandwich panels is achieved by welding the vertical support plate, and the connection between the vertical support plate and the I-beam 3 is achieved through steel fillet welds. By replacing the mechanical connection and bonding methods of composite materials with steel welding, the traditional shear stress at the connection interface is optimized to surface and line contact, significantly reducing stress concentration and improving the overall structural safety. This invention solves problems such as low load transfer efficiency, poor deformation coordination, and insufficient connection strength inherent in conventional connection technologies, making it suitable for connection scenarios where high connection strength is required between composite sandwich panels and steel structures.

[0037] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A marine composite sandwich panel connection mechanism supported by I-beams, characterized in that, It includes a steel connecting structure (1), a composite sandwich panel structure (2), and an I-beam (3). The composite sandwich panel structure (2) connects to both sides of the steel connecting structure (1), and the I-beam (3) is connected to the bottom of the steel connecting structure (1). The three form a symmetrical structure. The steel connecting structure (1) includes a vertical support plate and a steel pipe. The steel pipe is provided on both sides of the vertical support plate. The composite sandwich panel structure (2) is connected to the steel pipe. The I-beam (3) is connected to the bottom of the vertical support plate. The vertical support plate includes a left vertical support plate (11) and a right vertical support plate (12), which have the same structure and are symmetrically arranged. The left vertical support plate (11) and the right vertical support plate (12) are welded together. The left vertical support plate (11) and the right vertical support plate (12) have a protrusion in the middle of one side opposite to the connection point. The steel pipe is welded to the protrusion. The steel pipe is a slanted D-shaped steel pipe, including a left slanted D-shaped steel pipe (13) and a right slanted D-shaped steel pipe (14). The two have the same structure. The left slanted D-shaped steel pipe (13) is welded to the left vertical support plate (11), and the right slanted D-shaped steel pipe (14) is welded to the right vertical support plate (12). The left-sloping D-shaped steel pipe (13) includes an upper horizontal surface (131), a vertical surface (133), a lower horizontal surface (132), and a sloping side surface (134). The surfaces are connected by arc surfaces. The thickness of the vertical surface (133) and the arc surface at its connection with the upper horizontal surface (131) and the lower horizontal surface (132) is greater than the thickness of the other surfaces. The protrusion of the left vertical support plate (11) is welded to the vertical surface (133). The composite sandwich panel structure (2) includes an upper skin (21), a lower skin (22) and multiple core materials (23). The core materials (23) are trapezoidal hollow tubes. The core materials (23) are bonded to each other. The oblique side (134) of the left oblique D-shaped steel pipe (13) is bonded to the adjacent core material (23). The upper skin (21) and the lower skin (22) cover the core material (23) and the upper and lower sides of the left oblique D-shaped steel pipe (13) and the vertical surface (133) of the left oblique D-shaped steel pipe (13), respectively, and there are notches corresponding to the protrusions on the vertical surface (133).

2. The marine composite sandwich panel connection mechanism supported by I-beams according to claim 1, characterized in that, A reinforcing elbow plate (16) is provided on both sides of the connection between the left vertical support plate (11) and the right vertical support plate (12), and a connecting structure panel (15) is welded above the left vertical support plate (11) and the right vertical support plate (12).

3. The marine composite sandwich panel connection mechanism supported by I-beams according to claim 1, characterized in that, The upper surface of the connecting structure panel (15) of the steel connecting structure (1) is flush with the upper surface of the upper skin (21).

4. The marine composite sandwich panel connection mechanism supported by I-beams according to claim 1, characterized in that, The I-beam (3) includes an upper I-beam panel (31), a lower I-beam panel (33), and an I-beam web (32). The web (32) is provided with symmetrically arranged lateral reinforcing elbows (34) on both sides. The upper I-beam panel (31) is welded to the vertical support plate of the steel connection structure (1), and the width of the upper I-beam panel (31) is greater than the width of the steel connection structure (1).

5. The marine composite sandwich panel connection mechanism supported by I-beams according to claim 4, characterized in that, The reinforcing elbow plate (16) and the web plate (32) of the I-beam are located in the same plane.

6. The marine composite sandwich panel connection mechanism supported by I-beams according to claim 4, characterized in that, The composite sandwich panel structure (2) has an upper ceramic cotton (41) above the upper skin (21) and a lower ceramic cotton (42) below the lower skin (22). The upper ceramic cotton (41) is covered with an upper thin steel plate (51), and the lower ceramic cotton (42) is covered with a lower thin steel plate (52). The upper thin steel plate (51) is connected to the connecting structure panel (15) by bolts (17), and the lower thin steel plate (52) is welded to the upper panel (31) of the I-beam.

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