Fully assembled core column node aluminum alloy space grid structure

Abstract

This invention relates to a fully prefabricated core-column node aluminum alloy spatial grid structure, belonging to the field of spatial grid structure technology. It includes N chord layers and N-1 web layers, with N = 1, 2, 3, and 4 chord layers. Each chord in a chord layer is an I-shaped aluminum alloy member, simply referred to as an I-beam. These I-beams intersect at connection nodes according to certain rules, i.e., every m (m = 4, 5, 6, 7, 8) members converge at a connection node, forming a chord layer. The connection nodes of different chord layers are connected by vertical core columns. The portion of the vertical core column extending into the chord layer and connected to each converging chord is called a prefabricated core column node. The portion of the vertical core column located between the chord layers is called a web member. All web members together form a web layer. It features a simple structure, high load-bearing capacity, good stability, clear force transmission, and full prefabrication. It solves the problem that aluminum alloy spatial grids cannot be applied to large spans and high load conditions.

Description

Technical Field

[0001] This invention relates to the field of spatial grid structure technology, and specifically to a fully assembled core column node aluminum alloy spatial grid structure. Background Technology

[0002] Aluminum alloys possess advantages such as lightweight, high strength, and good corrosion resistance, leading to their increasing application in public and industrial sectors, commonly seen in applications like skylights and large oil tank mesh covers. Compared to steel, aluminum alloys have significant disadvantages, including poor weldability and a modulus of elasticity only one-third that of steel. Currently, their application in the construction field is primarily in small- to medium-span spatial structures, mainly using single-layer spatial grid structures with Temcor nodes (USA), and some employing double-layer spatial grid structures with aluminum alloy bolted ball or hub nodes. However, due to limitations in connection methods and stress requirements, this type of structure is rarely used in practical engineering. It is evident that existing aluminum alloy spatial grid structures have some problems in both node construction and structural form, such as:

[0003] The single-layer aluminum alloy spatial grid structure using Temcor nodes is mainly a single-layer grid structure with a certain curvature. This structure is mainly designed to withstand the internal forces of the membrane, that is, the internal structure is mainly subjected to axial forces. Therefore, in terms of node construction, the upper and lower flanges of each I-shaped aluminum alloy member are connected in an orderly manner with fasteners and cover plates, thereby transferring the external load on the overall structure to the foundation. However, the webs of each I-shaped aluminum alloy member are discontinuous and unconnected, and the out-of-plane bending stiffness of the nodes is very weak, so the structure cannot withstand slightly larger out-of-plane loads. At the same time, since the single-layer grid shell structure is mainly for stability control, and the nodes are weak and the elastic modulus of the material is low, the structure is mostly used in structures with small to medium spans that meet certain curvature requirements.

[0004] Double-layer aluminum alloy spatial grid structures, which utilize bolted ball joints or hub joints, are mainly flat or low-curvature grid structures. Because the double-layer structure can leverage the geometric stiffness of the structure, this type of structure usually has better out-of-plane stiffness than single-layer grid structures. However, since the bolted joints currently used are connected to the end plates or cones by mechanical molding or welding, the material strength is reduced by 30% to 50%, making the structure unable to withstand large loads and failing to fully utilize the advantages of aluminum alloy materials. On the other hand, grid structures using hub joints have small spacing between the upper and lower layers, resulting in weak structural stiffness and poor overall stability. Summary of the Invention

[0005] This invention primarily addresses the shortcomings of existing aluminum alloy spatial grid structures, such as low structural load-bearing capacity, small span, weak overall and nodal stiffness, limited structural form, simple stress pattern, restricted load conditions, and inability to meet the requirements of multi-layer spatial structure systems. It provides a fully prefabricated core-column node aluminum alloy spatial grid structure, characterized by simple structure, high load-bearing capacity, good stability, clear force transmission, and full prefabrication. This solves the problem that aluminum alloy spatial grids cannot be applied to large spans and high load conditions.

[0006] The above-mentioned technical problems of the present invention are mainly solved by the following technical solutions:

[0007] A fully prefabricated core-column node aluminum alloy spatial grid structure includes N chord layers and N-1 web layers. The number of chord layers N = 1, 2, 3, 4. Each chord in the chord layer is an I-shaped aluminum alloy member, referred to as an I-beam. The I-beams intersect at connection nodes according to certain rules, that is, every m (m = 4, 5, 6, 7, 8) members converge at a connection node to form a chord layer. The connection nodes of different chord layers are connected by vertical core columns. The part of the vertical core column extending into the chord layer is connected to each converging chord and is called a prefabricated core column node. The part of the vertical core column located between each chord layer is called a web member. All the web members together form a web layer. The assembled core column node includes a core column, an upper ring plate, a lower ring plate, angle aluminum fasteners, connecting plates, and fasteners. The upper and lower flanges of each I-beam aluminum member in the chord layer are connected to the upper and lower ring plates respectively through fasteners. The web of the I-beam aluminum member is connected to the corresponding core column limbs by two connecting plates through fasteners. The upper and lower ring plates are connected to the core column limbs respectively through angle aluminum fasteners.

[0008] Preferably, the structure is designed as a single-layer, double-layer, triple-layer, or quadruple-layer spatial grid structure as needed; that is, the number of chord layers N = 1, 2, 3, 4.

[0009] Preferably, the maximum value of the number of chord layers N is not limited to 4, or is greater than 4.

[0010] Preferably, the aluminum alloy spatial grid structure of the prefabricated core column node is in the form of a sphere, cylinder, parabola, or freeform surface.

[0011] As a preferred option, the composition rules of each I-beam aluminum member are selected according to the number m of members converging at the point, as follows:

[0012]

[0013] Preferably, the core column consists of an inner cross rib, a ring rib, and segments; the core column contains m segments, that is, the number of segments is consistent with the number of members that converge at a point in the chord layer; the length of the core column can be arbitrarily stretched and extended according to the number of chord layers in the aluminum alloy space grid structure to meet the needs of space grid structures with different numbers of layers.

[0014] Preferably, the fasteners are ordinary bolts, high-strength bolts, or grooved rivets; the materials of the fasteners are steel, stainless steel, aluminum alloy, or titanium alloy.

[0015] The present invention can achieve the following effects:

[0016] This invention provides a fully assembled core-column node aluminum alloy spatial grid structure, which, compared with existing technologies, features simple structure, high load-bearing capacity, good stability, clear force transmission, and full assembly. It solves the problem that aluminum alloy spatial grids cannot be applied to large spans and high load conditions. Attached Figure Description

[0017] Figure 1 This is an isometric view of the aluminum alloy spatial grid structure of the three-layer assembled core column node of the present invention.

[0018] Figure 2 This is a partial cross-sectional view of the aluminum alloy spatial grid structure of the three-layer assembled core column node of the present invention.

[0019] Figure 3 This is a planar projection of the chord layer of the aluminum alloy spatial grid structure when m=6 according to the present invention.

[0020] Figure 4 This is a planar projection view of the assembled core column node of the present invention.

[0021] Figure 5 This is a perspective view of the assembled core column node of the present invention.

[0022] Figure 6 This is a schematic diagram of the core column of the assembled core column node of the present invention.

[0023] Figure 7 This is a schematic diagram of the upper and lower ring plates of the assembled core column node of the present invention.

[0024] Figure 8 This is an isometric view of the double-layered square aluminum alloy spatial grid structure of the present invention.

[0025] Figure 9 This is a cross-sectional view of the double-layered interlocking square aluminum alloy space grid structure of the present invention.

[0026] Figure 10 This is a partial schematic diagram of the double-layered cubic aluminum alloy spatial grid structure of the present invention.

[0027] Figure 11 This is a planar projection of the chord layer of the double-layered square aluminum alloy spatial grid structure of the present invention.

[0028] Figure 12 This is a perspective view of the assembled core column node when m=4 according to the present invention.

[0029] Figure 13 This invention relates to a single-layer rib-ring type aluminum alloy spatial grid structure with m=4.

[0030] Figure 14 This is a planar projection of the single-layer rib-ring type aluminum alloy space grid structure of the present invention when m=4.

[0031] Figure 15 This is a vertical deformation diagram of the prefabricated core column node aluminum alloy spatial grid structure of the present invention when m=4.

[0032] Figure 16 This is the first vibration mode of the three-layer prefabricated core column node aluminum alloy spatial grid structure of the present invention when m=4.

[0033] Figure 17 This is the second vibration mode of the three-layer prefabricated core column node aluminum alloy spatial grid structure of the present invention when m=4.

[0034] Figure 18 This is the third vibration mode of the three-layer prefabricated core column node aluminum alloy spatial grid structure of the present invention when m=4.

[0035] Figure 19 It is the nonlinear stability coefficient of the three-layer assembled core column node aluminum alloy spatial grid structure of the present invention when m=4.

[0036] Figure 20 This is a stress cloud diagram of the assembled core column node of the present invention.

[0037] Figure 21 This is a comparison of the load-bearing capacity of the prefabricated core column node and the Temcor node of the present invention.

[0038] Figure 22 This is a comparison of the stiffness of the prefabricated core column node and the Temcor node of the present invention.

[0039] In the diagram: chord layer 1, web layer 2, prefabricated core column node 3, chord 4, core column 5, upper ring plate 6, lower ring plate 7, angle aluminum fastener 8, connecting plate 9, fastener 10, inner cross rib 11, ring rib 12, branch 13, upper flange 14, lower flange 15, web plate 16, bolt hole 17, vertical web member 18. Detailed Implementation

[0040] The technical solution of the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0041] Example 1: A fully assembled core-column node aluminum alloy spatial grid structure, including as follows Figure 1 and Figure 2 As shown, a three-layer prefabricated core column node aluminum alloy spatial grid structure is composed of three chord layers 1 and two web layers 2. That is, the number of chord layers 1 is N=3 and the number of web layers 2 is N-1=2, including chord layers 1, web layers 2 and prefabricated core column nodes 3.

[0042] The planar projection of the chord layer 1 is as follows: Figure 3 As shown, the chord layer 1 includes chords 4 and prefabricated core column nodes 3. The chords 4 are I-shaped aluminum alloy members. In the chord layer 1, the intersection rule of the chords 4 is a Kelvin grid pattern, and the number of chords 4 intersecting at each prefabricated core column node 3 is m = 6.

[0043] like Figure 4 and Figure 5 As shown, the prefabricated core column node 3 includes a core column 5 extending into the chord layer, an upper ring plate 6, a lower ring plate 7, an angle aluminum fastener 8, a connecting plate 9, and fasteners 10. Figure 6 As shown, the core post 5 is composed of an inner cross rib 11, a ring rib 12, and limbs 13; as Figure 7 As shown, the inner diameter of the upper ring plate 6 and the lower ring plate 7 is the outer diameter of the ring rib 12 of the core column 5 plus 10mm; in the chord layer 1, the upper flange 14 and the lower flange 15 at both ends of each chord 4 are connected to the upper ring plate 6 and the lower ring plate 7 respectively by fasteners 10; the upper ring plate 6 and the lower ring plate 7 are then connected to the limbs 13 of the core column 5 by angle aluminum fasteners 8 and fasteners 10; the web plates 16 at both ends of each chord 4 are connected to the core column 5 by two connecting plates 9 through fasteners 10, forming a three-layer spherical assembled core column node aluminum alloy space grid structure with a planar projection of a Kärvik type grid.

[0044] The number of branches 13 of the core post 5 and the included angle of each branch 13 are the same as the included angle of the converging chord 4 at each node; for example Figure 2 and Figure 6 As shown, the core column 5 runs through each chord layer 1, and bolt holes 17 are pre-set at the corresponding positions of each chord layer 1. The core column 5 between adjacent chord layers 1 is the vertical web member 18 of the aluminum alloy space grid structure. All the vertical web members 18 form the web member layer 3.

[0045] Example 2: A fully assembled core-column node aluminum alloy spatial grid structure, including as follows Figure 8 and Figure 9 , Figure 10 As shown, a double-layer prefabricated core-column node aluminum alloy spatial grid structure is constructed, consisting of two chord layers 1 and one web layer 2. Specifically, the number of chord layers 1 is N = 2, and the number of web layers 2 is N-1 = 1. Figure 11 As shown, the intersection rule of chord members 4 is a grid pattern, and the number of chord members 4 intersecting at each prefabricated core column node 3 is m = 4. Figure 12 As shown, the core column 5 has 4 branches, and the angle is the same as the included angle of the chord 4. The composition method of the rest of the embodiment is the same as that of embodiment one, and finally a double-layer cylindrical assembled core column node aluminum alloy space grid structure with a plane projection of a square grid is formed.

[0046] Example 3: A fully assembled core-column node aluminum alloy spatial grid structure, including as follows Figure 13 As shown, there is only one chord layer 1, meaning the number of chord layers 1 is N=1, and there are no web layers. Figure 14 As shown, the intersection rule of chord members 4 is a rib-ring type grid, and the number of chord members 4 intersecting at each prefabricated core column node 3 is m = 4. Figure 12 As shown, the core column 5 has four branches, and the included angle of the branches is the same as that of the chord 4. The height of the core column 5 only needs to meet the installation requirements with the chord 4. The components and assembly method of the assembled core column node 3 in this embodiment are basically the same as those in embodiment 1, and finally a single-layer spherical assembled core column node aluminum alloy space grid structure with a rib ring type grid in planar projection is formed.

[0047] In summary, this fully prefabricated core-column node aluminum alloy spatial grid structure features simple structure, high load-bearing capacity, good stability, clear force transmission, and full assembly. It solves the problem that aluminum alloy spatial grids cannot be applied to large spans and heavy load conditions.

[0048] The construction method for prefabricated core column node aluminum alloy spatial grid structures is determined comprehensively based on the stress condition and structural characteristics of the structure, taking into account factors such as economy, schedule, and construction site conditions. Common installation methods include high-altitude assembly, strip or block installation, overall hoisting, overall lifting, and overall jacking.

[0049] The beneficial effects of implementing this invention are:

[0050] Compared with existing aluminum alloy spatial grid structures using Temcor nodes, bolt ball nodes, or hub nodes, the prefabricated core column node of this invention has a simple structure, direct and efficient force transmission, and flexible form. The core column can be extended vertically to form a double-layer, triple-layer, or multi-layer aluminum alloy spatial grid structure according to the overall structural needs. It has strong adaptability and a wide range of applications.

[0051] The prefabricated core-column node aluminum alloy spatial grid structure of this invention exhibits excellent structural performance under external loads several times its own weight, meeting the engineering requirements of large spans and heavy loads. For example... Figure 15As shown, under a load of 5 times the structure's self-weight, the vertical deformation of a 100m span, double-layer, m=4 prefabricated core column node aluminum alloy space grid structure is only 92mm, approximately 1 / 1000 of the structure's span, far less than the requirements of the current industry standard "Technical Specification for Space Grid Structures"; Figures 16-18 As shown, the structure exhibits translational vibrations in the first and second orders, and torsional vibrations in the third order, demonstrating excellent dynamic performance; Figure 19 As shown, the nonlinear stability coefficient of the structure is 7.3, which is far better than the requirements of the current industry standard "Technical Specification for Spatial Grid Structures". This indicates that the prefabricated core column node aluminum alloy spatial grid structure of the present invention has excellent stability performance and can be applied to spatial structure buildings with different spans and different load conditions, including large, medium and small spans.

[0052] The prefabricated core column joint of this invention has high stiffness and high load-bearing capacity, and can simultaneously meet the requirements of different forms of internal forces such as bending moment, shear force, and axial force. Figures 20-22 As shown, compared with existing node types such as Temcor nodes and bolted ball nodes commonly used in current engineering, the load-bearing capacity and bending stiffness of the prefabricated core column node are significantly improved.

[0053] The above description is only a specific embodiment of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. A fully assembled core-column node aluminum alloy spatial grid structure, characterized in that: It includes N chord layers (1) and N-1 web layers (2), with the number of chord layers (1) N being greater than 1; each chord (4) in the chord layer (1) is an I-shaped aluminum alloy member, referred to as an I-beam aluminum member. Each I-beam aluminum member intersects at a connection node according to certain rules, that is, every m = 4, 5, 6, 7, 8 members converge at a connection node to form a chord layer (1). The connection nodes of different chord layers (1) are connected by vertical core columns (5); the part of the vertical core column (5) extending into the chord layer (1) is connected to each converging chord (4) and is called a prefabricated core column node (3). The part of the vertical core column (5) located between each chord layer (1) is called a web member (16). All the web members (16) together form a web layer (2); the prefabricated core column node (3) includes a core column (5), an upper ring plate (6), a lower ring plate (7), and an angle aluminum fastener. (8), connecting plate (9) and fastener (10), the upper flange (14) and lower flange (15) of each I-beam aluminum member in the chord layer (1) are connected to the upper ring plate (6) and lower ring plate (7) respectively through fastener (10), the web plate (16) of the I-beam aluminum member is connected to the corresponding core column (5) by two connecting plates (9) and fastener (10), the upper ring plate (6) and lower ring plate (7) are connected to the core column (5) by angle aluminum fastener (8); the core column (5) is composed of inner cross rib (11), ring rib (12) and limb (13); the core column (5) contains m limbs (13), that is, the number of limbs (13) is consistent with the number of members in the chord layer (1) that converge at one point; the length of the core column (5) can be arbitrarily stretched and extended according to the number of chord layers (1) of the aluminum alloy space grid structure to meet the needs of different number of layers of space grid structure.

2. The fully assembled core-column node aluminum alloy spatial grid structure according to claim 1, characterized in that: The form of the prefabricated core column node aluminum alloy spatial grid structure can be spherical, cylindrical, parabolic or free-form surface.

3. The fully assembled core-column node aluminum alloy spatial grid structure according to claim 1, characterized in that: The composition rules for each I-beam aluminum member are selected according to the number of members (m) converging at the point of intersection, as follows:

4. The fully assembled core-column node aluminum alloy space grid structure according to claim 1, characterized in that: The fasteners (10) are ordinary bolts, high-strength bolts or ring groove rivets; the materials of the fasteners (10) are steel, stainless steel, aluminum alloy or titanium alloy.

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