Node and dome structure for prestressed steel-aluminum reticulated shell structure

Abstract

According to the node and the dome structure for the prestressed steel-aluminum reticulated shell structure, the first node plate and the second node plate are arranged in parallel and are fixedly connected through the transition connecting piece, so that a double-layer bearing interface is formed, and the strength weakening risk caused by direct welding of an aluminum alloy structural part and a steel structural part is avoided; meanwhile, a hemispherical connecting point integrated by the second gusset plate is arranged outside a plate body, concentrated loads transmitted by a prestressed cable or a supporting rod are converted into a radial pressure stress field, the plane stress concentration coefficient of a traditional welding joint is remarkably reduced, a transition connecting piece serves as a rigidity buffering medium, differential deformation of a steel-aluminum component under the action of wind vibration or earthquakes is coordinated, and the rigidity of the steel-aluminum component is improved. The utility model solves the problems in the prior art that the stress concentration risk of the node area is increased, the local stress peak value on the node is easy to cause fatigue cracks and the overall safety of the structure is influenced because the existing node is often directly welded and connected with the pre-stressed cable and / or the structural support rod.

Description

Technical Field

[0001] This utility model belongs to the field of building structure technology, specifically relating to a node and dome structure for a prestressed steel-aluminum mesh shell structure. Background Technology

[0002] Prestressed reticulated shell structures are widely used in large public buildings due to their large spans, lightweight nature, and high load-bearing efficiency. In recent years, steel-aluminum hybrid reticulated shell structures have become an important development direction. Steel provides excellent tensile strength to bear the prestressing cable forces, while aluminum alloys, with their lightweight properties and corrosion resistance, significantly reduce the structure's self-weight and improve durability. This hybrid design combines the complementary advantages of the two materials, especially in large-span structures such as domes, optimizing internal force distribution and reducing material consumption.

[0003] Current node solutions face significant bottlenecks in steel-aluminum hybrid structures. Aluminum alloy reticulated shells commonly use plate riveting connections, but aluminum alloys have poor weldability, making direct welding to steel components impossible. Therefore, nodes are often used to connect steel and aluminum alloy components. However, existing nodes are often directly welded to prestressed cables and / or structural struts, leading to increased stress concentration risk in the node area. Especially under dynamic loads (such as wind-induced vibration or earthquakes), localized stress peaks at the nodes can easily trigger fatigue cracks, affecting the overall structural safety. Utility Model Content

[0004] To address the issue that aluminum alloy reticulated shells commonly use plate riveting connections, but aluminum alloys themselves have poor weldability and cannot be directly welded to steel components, and that existing nodes are often directly welded to prestressed cables and / or structural struts, leading to increased stress concentration risk in the node area, especially under dynamic loads (such as wind vibration or earthquakes), where local stress peaks at the nodes can easily trigger fatigue cracks, affecting the overall structural safety, this utility model provides a node and dome structure for prestressed steel-aluminum reticulated shell structures.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, this utility model provides a node for a prestressed steel-aluminum mesh shell structure, which is used to connect steel structural components and aluminum alloy structural components. The node includes: a first node plate, a second node plate, and a transition connector.

[0007] The first node plate and the second node plate are arranged in parallel and are fixedly connected by the transition connector;

[0008] Both the steel structural component and the aluminum alloy structural component are partially disposed between the first node plate and the second node plate, and are connected to the first node plate and the second node plate.

[0009] The second node plate includes a plate body, a hemispherical connection point, and a connecting lug plate, wherein the hemispherical connection point is fixedly installed on the plate body and is located on the side away from the first node plate;

[0010] The connecting lug is fixedly installed on the hemispherical connection point and is used to connect the steel cable or the strut.

[0011] Optionally, both the first node plate and the second node plate are provided with multiple anchoring through holes for installing fasteners to fix the steel structural component and the aluminum alloy structural component.

[0012] Optionally, an insulating pad is provided between the aluminum alloy structural component and both the first node plate and the second node plate.

[0013] Optionally, there are multiple connecting lugs, all of which are fixedly disposed on the spherical surface of the hemispherical connection point, and the included angle between any two adjacent connecting lugs is not less than 15 degrees.

[0014] Optionally, the connecting lug is arranged radially on the spherical surface at the hemispherical connection point.

[0015] Optionally, the hemispherical connection point is a complete hemisphere or a spherical crown, and there is an arc transition section between the hemispherical connection point and the plate.

[0016] Secondly, this utility model also provides a dome structure, which is composed of multiple nodes as described above for prestressed steel-aluminum mesh shell structures.

[0017] The beneficial effects of this utility model are:

[0018] This invention provides a node for a prestressed steel-aluminum reticulated shell structure. A first node plate and a second node plate are arranged parallel to each other and fixed together via a transition connector, forming a double-layer load-bearing interface. This spatially decouples the aluminum alloy components from the steel structural components, avoiding the risk of strength weakening caused by direct welding of the aluminum alloy and steel structural components. Simultaneously, the hemispherical connection point integrated into the second node plate is placed outside the plate, transforming the concentrated load transmitted by the prestressed cables or struts into a radial compressive stress field, significantly reducing the plane stress concentration coefficient of traditional welded nodes. The transition connector acts as a stiffness buffer, coordinating the differential deformation of the steel and aluminum components under wind vibration or seismic action, and preventing interface peeling cracks. This invention solves the problem that existing nodes are often directly welded to prestressed cables and / or structural struts, leading to increased stress concentration risk in the node area. Especially under dynamic loads (such as wind vibration or seismic action), local stress peaks at the node can easily trigger fatigue cracks, affecting the overall structural safety. Attached Figure Description

[0019] Figure 1 This is a model diagram of a node used in a prestressed steel-aluminum reticulated shell structure in this utility model;

[0020] Figure 2 This is a detailed model schematic diagram of the node used in the prestressed steel-aluminum reticulated shell structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the dome structure in this utility model;

[0022] Figure 4 This is a schematic diagram of a regular node.

[0023] Wherein: 1. First node plate; 2. Second node plate; 21. Plate body; 22. Hemispherical connection point; 23. Connecting ear plate; 3. Transition connector; 4. Steel structural component; 5. Aluminum alloy structural component; 6. Anchoring through hole; 7. Strut; 8. Steel cable; 101. Node in the dome structure used for prestressed steel-aluminum mesh shell structure; 102. Conventional node. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0027] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0028] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0029] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0030] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] Firstly, see [the following] Figures 1 to 3 The diagram shows a node for a prestressed steel-aluminum mesh shell structure according to the present invention. The node is used to connect the steel structural member 4 and the aluminum alloy structural member 5, and includes: a first node plate 1, a second node plate 2 and a transition connector 3.

[0032] The first node plate 1 and the second node plate 2 are arranged in parallel and are fixedly connected by the transition connector 3;

[0033] Steel structural component 4 and aluminum alloy structural component 5 are both partially disposed between the first node plate 1 and the second node plate 2, and are connected to the first node plate 1 and the second node plate 2.

[0034] The second node plate 2 includes a plate body 21, a hemispherical connection point 22 and a connecting lug plate 23, wherein the hemispherical connection point 22 is fixedly installed on the plate body 21 and is located on the side away from the first node plate 1.

[0035] The connecting ear plate 23 is fixedly installed on the hemispherical connection point 22 and is used to connect the steel cable 7 or the strut 8.

[0036] In this embodiment, the first node plate 1 and the second node plate 2 are arranged in parallel and fixedly connected by a transition connector to form a double-layer load-bearing interface. This spatially decouples the aluminum alloy structural component 5 from the steel structural component 4, avoiding the risk of strength weakening caused by direct welding of the aluminum alloy structural component 5 and the steel structural component 4. At the same time, the hemispherical connection point 22 integrated in the second node plate 2 is placed outside the plate body 21, which transforms the concentrated load transmitted by the prestressed cable or strut into a radial compressive stress field, significantly reducing the plane stress concentration coefficient of the traditional welded node. The transition connector 3 acts as a stiffness buffer medium, coordinating the differential deformation of the steel and aluminum components under wind vibration or earthquake, and avoiding interface peeling cracks. This utility model solves the problem that existing nodes are often directly welded to the prestressed cable and / or structural strut, which leads to an increased risk of stress concentration in the node area. Especially under dynamic loads (such as wind vibration or earthquake), there are local stress peaks on the node that are prone to fatigue cracks, affecting the overall safety of the structure.

[0037] Furthermore, the number of steel structural components 4 and aluminum alloy structural components 5 can be determined by those skilled in the art based on actual usage requirements, and each can be a single component or multiple components.

[0038] Optionally, refer to Figure 2 In this utility model, both the first node plate 1 and the second node plate 2 are provided with multiple anchoring through holes 6 for installing fasteners to fix the steel structural component 4 and the aluminum alloy structural component 5.

[0039] In this embodiment, multiple anchoring through holes 6 are provided on both the first node plate 1 and the second node plate 2 to provide a mechanical anchoring interface for the steel structural component 4 and the aluminum alloy structural component 5. The components are fixed by high-strength bolts or rivets, which completely avoids the risk of connection failure caused by the poor weldability of aluminum alloy. The array layout of the anchoring through holes 6 optimizes the load transfer path, so that the cable force or strut pressure is evenly distributed to the whole of the node plate through the shear force of the hole wall, eliminating the local stress distortion caused by traditional single-point connection. Especially under the repeated wind vibration of large-span reticulated shell, the stress concentration coefficient around the through holes is greatly reduced, delaying the initiation of fatigue cracks.

[0040] Furthermore, the multiple anchoring through holes 6 can be arranged in an array to form multiple sets of anchoring through holes, so as to fasten the steel structural component 4 or aluminum alloy structural component 5 of the reticulated shell structure respectively. It should be noted that in actual use, those skilled in the art can select the number and arrangement of the anchoring through holes 6 according to the actual use requirements, and no further limitation is made in this embodiment.

[0041] Optionally, an insulating pad is provided between the aluminum alloy structural component and the first node plate 1 and the second node plate 2 in this utility model.

[0042] In this embodiment, the introduction of the insulating pad can avoid the hidden dangers of electrochemical corrosion between steel and aluminum, and ensure the stability of the node in long-term use. Specifically, the insulating pad is located between the aluminum alloy structural component 4 and the node plate, blocking the ion migration channels of dissimilar metals in a humid environment, and effectively suppressing the gradual weakening of the interface strength by galvanic corrosion. In addition, the insulating pad can also act as a deformation coordination layer, absorbing the interface stress caused by the difference in thermal expansion coefficients, and preventing connection loosening or fretting wear caused by periodic temperature changes. It can also improve the node's ability to dissipate vibration energy, dissipating some kinetic energy through viscoelastic deformation during the transmission of seismic waves, and reducing the risk of resonance damage to the node.

[0043] Optionally, there are multiple connecting ear plates 23 in this utility model. All multiple connecting ear plates 23 are fixedly arranged on the spherical surface of the hemispherical connection point 22, and the included angle between any two adjacent connecting ear plates 23 is not less than 15 degrees.

[0044] Optionally, the connecting ear plate 23 in this invention is arranged radially on the spherical surface of the hemispherical connection point 22.

[0045] In this embodiment, the connecting lugs 23 are distributed on the spherical surface at an angle of not less than 15 degrees to form a spatial force system balance structure, so that the oblique cable force is naturally decomposed into normal pressure and tangential components in the spherical coordinate system. The tangential forces cancel each other out through the spherical symmetry, eliminating the additional bending moment generated when the traditional planar node bears eccentric load. The design of the connecting lugs 23 extending radially along the spherical surface ensures that the cable tension is always transmitted in the radial direction of the hemisphere, avoiding the peeling effect of the shear force component on the root of the connecting lugs 23, and reducing the stress concentration factor under strong earthquake or impact load.

[0046] Optionally, the hemispherical connection point 22 in this utility model is a complete hemispherical or spherical crown shape, and there is an arc transition section between the hemispherical connection point 22 and the plate 21.

[0047] In this embodiment, the arc-shaped transition section constructs a curvature gradient zone between the plate 21 and the hemispherical connection point 22, achieving a smooth transition in stiffness, avoiding stress singularities caused by sharp angles, eliminating geometric abrupt changes at traditional right-angle welds, and further reducing the stress concentration factor. Especially under strong earthquakes, the arc-shaped transition section absorbs seismic energy through plastic deformation, preventing brittle fracture. At the same time, it optimizes the flow of molten metal in the casting process, avoids cold shut defects, and significantly improves the fatigue life of the joint.

[0048] Secondly, referring to Figure 3 The present invention also provides a dome structure, which is composed of a plurality of nodes 101 as described above for prestressed steel-aluminum mesh shell structures.

[0049] In this embodiment, a dome structure is provided, which is composed of multiple nodes 101 as described above for prestressed steel-aluminum mesh shell structures. Specifically, the nodes are connected by steel structural members 4 or aluminum alloy structural members 5. It should be noted that the nodes 101 for prestressed steel-aluminum mesh shell structures in this embodiment are the same as the nodes for prestressed steel-aluminum mesh shell structures described above, and their beneficial effects are also similar, so they will not be described in detail here.

[0050] Furthermore, the dome structure in this embodiment also includes several conventional node 102 structures, that is, nodes that do not require connection of steel cable 8 and strut 7. They do not require the hemispherical connection point and connecting ear plate on the node in this utility model, and are only used to connect steel structural components and / or aluminum alloy structural components.

[0051] Furthermore, the conventional node 102 in this embodiment has a structure known to those skilled in the art, and its specific structure can be found in [reference needed]. Figure 4 As shown.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0053] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A node for a prestressed steel-aluminum reticulated shell structure, used to connect steel structural members (4) and aluminum alloy structural members (5), characterized in that, The node includes: a first node plate (1), a second node plate (2), and a transition connector (3); The first node plate (1) and the second node plate (2) are arranged in parallel and are fixedly connected by the transition connector (3); The steel structural component (4) and the aluminum alloy structural component (5) are both partially disposed between the first node plate (1) and the second node plate (2), and are connected to the first node plate (1) and the second node plate (2); The second node plate (2) includes a plate body (21), a hemispherical connection point (22) and a connecting ear plate (23), wherein the hemispherical connection point (22) is fixedly installed on the plate body (21) and is located on the side away from the first node plate (1); The connecting ear plate (23) is fixedly installed on the hemispherical connection point (22) and is used to connect the steel cable (8) or the strut (7).

2. The node for a prestressed steel-aluminum reticulated shell structure according to claim 1, characterized in that, Both the first node plate (1) and the second node plate (2) are provided with multiple anchoring through holes (6) for installing fasteners to fix the steel structural component (4) and the aluminum alloy structural component (5).

3. The node for a prestressed steel-aluminum reticulated shell structure according to claim 1, characterized in that, An insulating pad is provided between the aluminum alloy structural component (5) and the first node plate (1) and the second node plate (2).

4. The node for a prestressed steel-aluminum reticulated shell structure according to claim 1, characterized in that, There are multiple connecting ear plates (23), and all of the multiple connecting ear plates (23) are fixedly set on the spherical surface of the hemispherical connection point (22). The included angle between any two adjacent connecting ear plates (23) is not less than 15 degrees.

5. The node for a prestressed steel-aluminum reticulated shell structure according to claim 4, characterized in that, The connecting ear plate (23) is arranged radially on the spherical surface of the hemispherical connection point (22).

6. The node for a prestressed steel-aluminum reticulated shell structure according to claim 1, characterized in that, The hemispherical connection point (22) is a complete hemisphere or spherical crown, and there is an arc transition section between the hemispherical connection point (22) and the plate (21).

7. A dome structure, characterized in that, The dome structure is composed of a plurality of nodes as described in claims 1 to 6 for a prestressed steel-aluminum reticulated shell structure.

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