Double-steel-plate concrete gradient foamed aluminum combined wallboard

Abstract

The invention provides a double-steel-plate concrete gradient foamed aluminum combined wallboard which comprises a gradient foamed aluminum plate, an upper-layer double-steel-plate and a lower-layer double-steel-plate, and the gradient foamed aluminum plate comprises a first foamed aluminum plate, a second foamed aluminum plate and a third foamed aluminum plate which are sequentially bonded from top to bottom; the first foamed aluminum plate, the second foamed aluminum plate and the third foamed aluminum plate are different in density; the first foamed aluminum plate, the second foamed aluminum plate and the third foamed aluminum plate which are different in density are arranged in the thickness direction of the wallboard and are in close fit with the upper-layer double steel plates and the lower-layer double steel plates, and the single material distribution mode of a traditional homogeneous energy absorption layer is changed; the energy absorption capacity of the gradient foamed aluminum plate and the upper-layer double steel plates is effectively enhanced, a multi-stage energy dissipation mechanism is formed, and the stability of the overall structure of the combined wallboard is improved while the graded energy dissipation target is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of building components, in particular to a double-steel plate concrete gradient foam aluminum composite wall panel. Background Art

[0002] In recent years, double steel plate-concrete composite structures have attracted widespread attention in protective engineering and building structures due to their excellent impact resistance, high bearing capacity and good deformation coordination.

[0003] While traditional double-steel-plate concrete composite wall panels with energy-absorbing layers (e.g., homogeneous aluminum foam infill structures) can dissipate energy through plastic deformation, their efficiency is limited by the uniformity of the material distribution. This leads to stress concentration and localized premature failure, making it difficult to maintain overall structural stability under impact or blast loads. Furthermore, the energy absorption mechanism of traditional energy-absorbing layers often relies on the plastic deformation of a single material, resulting in limited energy dissipation paths and difficulty achieving the goal of graded energy dissipation.

[0004] In view of this, the inventor specially designed a double steel plate concrete gradient foam aluminum composite wall panel, which resulted in this case. Summary of the Invention

[0005] In order to solve the above problems, the technical solutions of the present invention are as follows: A double steel plate concrete gradient foam aluminum composite wall panel, comprising: Upper double steel plate; The lower double steel plate has the same structure as the upper double steel plate; A gradient foam aluminum plate is located between an upper double steel plate and a lower double steel plate, and the gradient foam aluminum plate includes a first foam aluminum plate, a second foam aluminum plate, and a third foam aluminum plate bonded sequentially from top to bottom; the first foam aluminum plate is bonded to the upper double steel plate, and the third foam aluminum plate is bonded to the lower double steel plate; the density of the first foam aluminum plate is less than that of the second foam aluminum plate, and the density of the second foam aluminum plate is less than that of the third foam aluminum plate.

[0006] Preferably, the density of the first foam aluminum plate is 0.16 g / cm 3 ~0.20g / cm 3 The density of the second foam aluminum plate is 0.23g / cm 3 ~0.27g / cm 3 The density of the third foam aluminum plate is 0.32 g / cm 3 ~0.36g / cm 3 .

[0007] Preferably, the density difference between the first foam aluminum plate and the second foam aluminum plate and the density difference between the second foam aluminum plate and the third foam aluminum plate is ≥0.02 g / cm3 .

[0008] Preferably, the upper double steel plate includes a top steel plate, a channel steel frame and a bottom steel plate, and the bottom steel plate has the same thickness as the top steel plate.

[0009] Preferably, the channel steel frame includes a plurality of strip frames, and the plurality of strip frames are welded in a crisscross manner to form a grid structure.

[0010] Preferably, through-type threaded holes are provided at the intersection nodes of several of the strip frames, and the top steel plate, the bottom steel plate and the channel steel frame are threadedly connected by connecting screws passing through the threaded holes.

[0011] Preferably, the channel steel frame is filled with a concrete core layer, and a number of bolt connectors are buried in the concrete core layer along the circumference of the strip frame of the channel steel frame. The two ends of the bolt connector are respectively arranged in the concrete core layer in the upper double steel plate and the concrete core layer in the lower double steel plate. The bolt connector passes through the gradient foam aluminum plate, and the gradient foam aluminum plate, the upper double steel plate and the lower double steel plate are connected by the bolt connector.

[0012] The technical solution provided by the present invention has the following beneficial effects: 1. The present invention arranges a first foam aluminum plate, a second foam aluminum plate and a third foam aluminum plate with different densities along the thickness direction of the wall panel, which closely cooperate with the upper double steel plate and the lower double steel plate, changing the single material distribution mode of the traditional homogeneous energy absorption layer. Under the action of low-speed impact, by regulating the density gradient of the gradient foam aluminum plate, the energy absorption capacity of the gradient foam aluminum plate and the upper double steel plate is effectively enhanced. The first layer of foam aluminum plate preferentially undergoes large plastic deformation and enters the densification stage, and consumes energy as a "sacrificial area" to protect the core load-bearing structure; the second layer of foam aluminum plate enters the plastic platform stage as the stress increases, and consumes energy stably by collapsing; the third layer of foam aluminum plate provides high resistance in the later stage of load action, delays the time to enter the densification stage, thereby prolonging the energy absorption time, forming a multi-level energy consumption mechanism, achieving the graded energy consumption goal while improving the stability of the overall structure of the composite wall panel.

[0013] 2. The present invention forms a multi-level load-bearing and energy-dissipating system with "rigidity and flexibility synergy" by combining an upper double steel plate, a lower double steel plate and a gradient foam aluminum plate. The upper double steel plate provides high-strength bending and shear bearing capacity, converts concentrated loads into uniformly distributed loads and enhances overall stability, while the gradient foam aluminum plate efficiently dissipates impact energy through pore collapse and plastic deformation. The lower double steel plate acts as a load-bearing structure to resist the load, achieving a coordinated response of "stress uniformization - graded energy dissipation - controllable damage" under local loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0015] in: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the channel steel frame structure of the present invention; Figure 3 This is the structure and schematic diagram of the double steel plates under the gradient foam aluminum plate of the present invention; Figure 4 This is a diagram showing the proportion of energy absorbed by each component of the S1 and S2 composite wall panels; Figure 5 This is a diagram showing the proportion of energy absorbed by each component of the S3, S4 and S5 composite wall panels.

[0016] Description of labels: 1. Gradient foam aluminum plate; 11. First foam aluminum plate; 12. Second foam aluminum plate; 13. Third foam aluminum plate; 2. Upper double steel plate; 21. Top steel plate; 22. Channel steel frame; 23. Bottom steel plate; 24. Strip frame; 25. Threaded hole; 26. Connecting screw; 27. Concrete core layer; 28. Bolt connector; 3. Lower double steel plate. DETAILED DESCRIPTION

[0017] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] See also Figures 1 to 5 , is a double steel plate concrete gradient foam aluminum composite wall panel as the best embodiment of the present invention, comprising: Upper double steel plate 2; The lower double steel plate 3 has the same structure as the upper double steel plate 2, and the upper double steel plate 2 and the lower double steel plate 3 are symmetrically arranged; The gradient foam aluminum plate 1 is located between the upper double steel plate 2 and the lower double steel plate 3. The gradient foam aluminum plate 1 includes a first foam aluminum plate 11, a second foam aluminum plate 12 and a third foam aluminum plate 13 bonded in sequence from top to bottom; the first foam aluminum plate 11 is bonded to the upper double steel plate 2, and the third foam aluminum plate 13 is bonded to the lower double steel plate 3; the density of the first foam aluminum plate 11 is less than the density of the second foam aluminum plate 12, and the density of the second foam aluminum plate 12 is less than the density of the third foam aluminum plate 13. By adjusting the density of the gradient foam aluminum plate 1 The gradient effectively enhances the energy absorption capacity of the gradient foam aluminum plate 1. The low-density layer of foam aluminum plate undergoes large plastic deformation first and enters the densification stage. As a "sacrificial zone", it consumes energy first to protect the core load-bearing structure. The medium-density layer of foam aluminum plate enters the plastic platform stage as the stress increases, and consumes energy stably by collapsing. The high-density layer of foam aluminum plate provides high resistance in the later stage of load action, delaying the time to enter the densification stage to prolong the energy absorption time. The gradient foam aluminum plate 1 can effectively disperse and absorb external forces due to its special density distribution. The density of the first foam aluminum plate 11, the second foam aluminum plate 12 and the third foam aluminum plate 13 forms a stepped distribution. This structure allows the force to be gradually transmitted and attenuated between different foam aluminum plate layers when subjected to impact or pressure. The double steel plate structure can provide higher strength and rigidity. Combined with the gradient foam aluminum plate 1, it can effectively prevent the structure from bending, deforming and other problems when subjected to force.

[0019] The upper double steel plate 2 provides high-strength bending and shear bearing capacity, converts concentrated loads into uniformly distributed loads and enhances overall stability, while the gradient foam aluminum plate 1 efficiently dissipates impact energy through pore collapse and plastic deformation. The lower double steel plate 3 acts as a load-bearing structure to resist the load, achieving a coordinated response of "stress uniformization-energy graded dissipation-damage controllability" under local loads. Since the upper double steel plate 2 and the lower double steel plate 3 have the same and symmetrical structure, when in use, it is only necessary to arrange the density of the first foam aluminum plate 11, the second foam aluminum plate 12 and the third foam aluminum plate 13.

[0020] For details, please refer to Figures 1 to 5 The density of the first foam aluminum plate 11 is 0.16 g / cm 3 ~0.20g / cm 3 The density of the second foam aluminum plate 12 is 0.23g / cm 3 ~0.27g / cm 3 The density of the third foam aluminum plate 13 is 0.32g / cm 3 ~0.36g / cm 3 , The density difference between the first foam aluminum plate 11 and the second foam aluminum plate 12 and the density difference between the second foam aluminum plate 12 and the third foam aluminum plate 13 is ≥ 0.02 g / cm 3 .

[0021] For details, please refer to Figures 1 to 5 In this embodiment, five composite wall panels are taken for impact test, which are labeled S1, S2, S3, S4 and S5 respectively. The specific parameters are shown in Table 1 and Table 2. The foam aluminum type of S1, S3 and S4 is the gradient foam aluminum plate of the present invention, and the density of the first foam aluminum plate 11 is 0.188g / cm 3 The density of the second foam aluminum plate 12 is 0.252 g / cm 3 The density of the third foam aluminum plate 13 is 0.346 g / cm 3 The foam aluminum type of S2 and S5 is homogeneous foam aluminum plate with a density of 0.252g / cm 3 , they were classified, S1 and S2 were subjected to low-speed impact test with an impact speed of 11.3km / h, S3, S4 and S5 were subjected to high-speed impact test with an impact speed of 50.4km / h.

[0022] Table 1 Specimen parameters of drop weight impact test under different impact conditions Note: ρ f1 – Density of the first layer of foam aluminum; ρ f2 – The density of the second layer of foam aluminum; ρ f3 – The density of the third layer of foam aluminum; v – impact velocity.

[0023] Table 2 Mechanical properties of each layer of gradient aluminum foam Note: ρ f – Average density of aluminum foam; E f – Elastic modulus of aluminum foam; σ f – Stress of aluminum foam platform.

[0024] Please refer to Figure 4 For a typical double-steel plate concrete gradient foam aluminum composite wall panel, the upper double steel plate 2 and gradient foam aluminum form an energy absorption layer, and the lower double steel plate 3 is the protected structure. As shown in Table 1, specimens S1 and S2 both contain an upper double steel plate 2. Specimen S1 is a specimen with a gradient foam aluminum plate 1, and specimen S2 is a specimen with a homogeneous foam aluminum plate. Except for the gradient type of the foam aluminum, the other geometric parameters and impact conditions are exactly the same. Figure 5The energy absorption ratio of each component of the double steel plate concrete gradient foam aluminum composite wall panel under low-speed impact is demonstrated. Under the same impact energy, compared with the specimen S2 with homogeneous foam aluminum plate, the energy absorbed by the energy absorption layer of the specimen S1 with gradient foam aluminum plate 1 increased by 3.2%, and the energy absorbed by the gradient foam aluminum plate 1 increased by 1%. Therefore, the energy absorption capacity of the gradient foam aluminum plate 1 and the upper double steel plate 2 can be effectively enhanced by regulating the density gradient of the gradient foam aluminum plate 1.

[0025] Please refer to Figure 5 As shown in Table 2, specimen S3 is a double steel plate concrete gradient foam aluminum composite wall panel specimen; specimen S4 is a double steel plate concrete composite wall panel specimen with only a gradient foam aluminum plate 1 energy absorption layer, and the top layer of the gradient foam aluminum plate 1 does not have an upper double steel plate 2; specimen S5 is a double steel plate concrete composite wall panel specimen with only a homogeneous foam aluminum plate energy absorption layer, and its form is the same as specimen S4. In addition, specimens S3, S4, and S5 have the same material usage and the same impact conditions. Figure 5 The results show that under the same impact energy, the energy absorption ratio of the energy absorption layer of specimen S3 is significantly higher than that of the energy absorption layer of specimens S4 and S5, which are 44.3% and 72.1% higher respectively. This proves that the multi-level load-bearing and energy-dissipating system of the new double-steel plate concrete gradient foam aluminum composite wall panel with "rigid-flexible synergy" has obvious advantages in energy dissipation.

[0026] Please refer to Figures 1 to 5 The upper double steel plate 2 includes a top steel plate 21, a channel steel frame 22, and a bottom steel plate 23. The bottom steel plate 23 is the same thickness as the top steel plate 21. The top and bottom steel plates 21 and 23 are the same thickness and, combined with the channel steel frame 22, form a solid structure. The channel steel frame 22 provides high rigidity and strength, effectively resisting bending and shear forces. The top and bottom steel plates 21 and 23 are of the same thickness, ensuring that stress is evenly distributed between the upper and lower steel plates when subjected to force. This avoids stress concentration caused by differences in steel plate thickness and improves the load-bearing capacity and durability of the entire structure.

[0027] Please refer to Figure 2 The channel steel frame 22 comprises several U-shaped strips 24, which are welded together to form a grid structure. This grid structure effectively disperses and withstands loads from all directions. Channel steel itself possesses high strength and rigidity, and its U-shaped cross-section is resistant to bending and shear deformation. Within the grid structure, the individual strips 24 support each other, forming a stable spatial structure, thereby enhancing the load-bearing capacity of the entire channel steel frame 22.

[0028] Please refer to Figure 2and Figure 3 , several strip frames 24 are provided with through-type threaded holes 25 at the intersection nodes, and the top steel plate 21, the bottom steel plate 23 and the channel steel frame 22 are threadedly connected by connecting screws 26 passing through the threaded holes 25. The cooperation between the through-type threaded holes 25 and the connecting screws 26 can provide higher connection strength. The screws can tightly pull the top steel plate 21, the bottom steel plate 23 and the channel steel frame 22 together to form a structure with better integrity.

[0029] Please refer to Figures 1 to 5 The channel steel frame 22 is filled with a concrete core layer 27. A number of bolt connectors 28 are buried in the concrete core layer 27 along the circumference of the strip frame 24 of the channel steel frame 22. The two ends of the bolt connector 28 are respectively provided on the upper In the concrete core layer 27 of the steel plate 2 and the concrete core layer 27 of the lower double steel plate, the bolt connector 28 passes through the gradient foam aluminum plate 1. The gradient foam aluminum plate 1, the upper double steel plate 2, and the lower double steel plate 3 are connected by the bolt connector 28. The bolt connector 28 passes through the gradient foam aluminum plate 1 and connects the concrete core layer 27 of the upper double steel plate 2 and the lower double steel plate 3. When the structure is subjected to tension, the bolt connector 28 can effectively transfer the tension to each part, giving full play to the advantages of each material. The gradient foam aluminum plate 1 can provide a certain tensile strength, while the double steel plate and the concrete core layer 27 can withstand greater tension, thereby significantly improving the tensile performance of the entire structure.

[0030] To sum up, the present invention arranges a first foam aluminum plate 11, a second foam aluminum plate 12 and a third foam aluminum plate 13 with different densities along the thickness direction of the wall panel, which closely cooperate with the upper double steel plate 2 and the lower double steel plate 3, changing the single material distribution mode of the traditional homogeneous energy absorption layer. Under the action of low-speed impact, by regulating the density gradient of the gradient foam aluminum plate 1, the energy absorption capacity of the gradient foam aluminum plate 1 and the upper double steel plate 2 is effectively enhanced. The first layer of foam aluminum plate preferentially undergoes large plastic deformation and enters the densification stage, and consumes energy as a "sacrificial area" to protect the core load-bearing structure; the second layer of foam aluminum plate enters the plastic platform stage as the stress increases, and consumes energy stably by collapsing; the third layer of foam aluminum plate provides high resistance in the later stage of load action, delays the time to enter the densification stage, so as to prolong the energy absorption time, form a multi-level energy consumption mechanism, and achieves the graded energy consumption goal while improving the stability of the overall structure of the combined wall panel.

[0031] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A double steel plate concrete gradient foam aluminum composite wall panel, characterized in that: include: Upper double steel plate (2); The lower double steel plate (3) has the same structure as the upper double steel plate (2); A gradient foam aluminum plate (1) is located between an upper double steel plate (2) and a lower double steel plate (3), wherein the gradient foam aluminum plate (1) comprises a first foam aluminum plate (11), a second foam aluminum plate (12), and a third foam aluminum plate (13) bonded sequentially from top to bottom; the first foam aluminum plate (11) is bonded to the upper double steel plate (2), and the third foam aluminum plate (13) is bonded to the lower double steel plate (3); the density of the first foam aluminum plate (11) is less than that of the second foam aluminum plate (12), and the density of the second foam aluminum plate (12) is less than that of the third foam aluminum plate (13).

2. The double steel plate concrete gradient foam aluminum composite wall panel according to claim 1, characterized in that: The density of the first foam aluminum plate (11) is 0.16 g / cm 3 ~0.20g / cm 3 The density of the second foam aluminum plate (12) is 0.23 g / cm 3 ~0.27g / cm 3 The density of the third foam aluminum plate (13) is 0.32 g / cm 3 ~0.36g / cm 3 .

3. The double steel plate concrete gradient foam aluminum composite wall panel according to claim 1, characterized in that: The density difference between the first foam aluminum plate (11) and the second foam aluminum plate (12) and the density difference between the second foam aluminum plate (12) and the third foam aluminum plate (13) is ≥ 0.02 g / cm 3 .

4. The double steel plate concrete gradient foam aluminum composite wall panel according to claim 1, characterized in that: The upper double steel plate (2) comprises a top steel plate (21), a channel steel frame (22), and a bottom steel plate (23), wherein the bottom steel plate (23) has the same thickness as the top steel plate (21).

5. The double steel plate concrete gradient foam aluminum composite wall panel according to claim 4, characterized in that: The channel steel frame (22) comprises a plurality of strip frames (24), and the plurality of strip frames (24) are welded in a crisscross manner to form a grid structure.

6. The double steel plate concrete gradient foam aluminum composite wall panel according to claim 5, characterized in that: Through-type threaded holes (25) are provided at the intersection nodes of the plurality of strip frames (24), and the top steel plate (21), the bottom steel plate (23) and the channel steel frame (22) are threadedly connected via connecting screws (26) that penetrate the threaded holes (25).

7. The double steel plate concrete gradient foam aluminum composite wall panel according to claim 5, characterized in that: The channel steel frame (22) is filled with a concrete core layer (27), and a plurality of bolt connectors (28) are embedded in the concrete core layer (27) along the circumference of the strip frame (24) of the channel steel frame (22). The two ends of the bolt connector (28) are respectively arranged in the concrete core layer (27) in the upper double steel plate (2) and the concrete core layer (27) in the lower double steel plate. The bolt connector (28) passes through the gradient foam aluminum plate (1), and the gradient foam aluminum plate (1), the upper double steel plate (2) and the lower double steel plate (3) are connected by the bolt connector (28).

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