A variable cross-section chordal folded truss node
By using truss nodes with bent chords of varying cross-sections and connecting chords of different cross-sectional areas using variable diameter structures, the problem of complex transition nodes with varying cross-section cavities in large-span truss structures is solved. This achieves a smooth transition of the node domain, reduces the difficulty of processing, and enhances the connection strength and stiffness.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- POWERCHINA HUADONG ENG CORP LTD
- Filing Date
- 2025-08-15
- Publication Date
- 2026-07-24
AI Technical Summary
In large-span truss structures, the transition of variable cross-section cavities forms complex nodes, leading to stress concentration and increased processing difficulty. In particular, when the dimensions of the box-shaped members on both sides of the node are different, it is impossible to achieve a stable connection between the inside and outside of the plane.
The truss nodes employ a variable cross-section chord bending design, connecting the first and second chords with different cross-sectional areas via connecting chords. The variable diameter structure achieves a smooth transition within the node region, and welding connections ensure the strength and stiffness of the connection.
It achieves a smooth transition of the node domain, reduces stress concentration, lowers the processing difficulty, improves the connection strength and stiffness of the nodes, and avoids the occurrence of spatial non-standard panel components.
Smart Images
Figure CN224549366U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of engineering steel structure technology, specifically to a truss node with a variable cross-section chord bending. Background Technology
[0002] Long-span truss structures often use downward-sloping chords connected to surrounding frame columns at the ends to increase inter-story stiffness. This inevitably creates complex node formations with bent chords at the truss ends. To ensure stability in both in-plane and out-of-plane directions, box-section sections are commonly used for the chords of long-span trusses. When box-section sections of the same size are used on both sides of the bent chord node, the sidewalls of the intersection area lie in the same spatial plane, resulting in a smooth transition and ease of fabrication. However, when the dimensions of the box-section members on both sides of the node differ, the sidelines of the intersecting members are not in the same spatial plane, necessitating a transition connection to form a variable-section cavity that transitions from a larger to a smaller cross-section. The transition forms of variable-section cavities are diverse; a well-designed structure can ensure smooth stress transfer in the node area, reduce stress concentration, and lower fabrication difficulty. Summary of the Invention
[0003] This application provides a truss node with a variable cross-section chord bending, which enables a smoother transition between node domains and avoids the generation of spatially irregular panel components.
[0004] The variable cross-section chord bending truss node provided in this application includes: a first chord, the first chord including a first wall and a first cavity formed by the first wall; The second chord includes a second wall and a second cavity formed by the second wall, and the cross-sectional area of the second cavity is smaller than the cross-sectional area of the first cavity; A connecting chord includes a third wall and a third cavity enclosed by the third wall. The third wall has a first cross-section at one end along its length and a second cross-section at the other end along its length. The area of the first cross-section is the same as the cross-sectional area of the first cavity, and the area of the second cross-section is the same as the cross-sectional area of the second cavity. The cross-sectional area of the third cavity decreases linearly from the first cross-section to the second cross-section. The connecting chord is connected to the first chord at one end of the first cross-section and to the second chord at one end of the second cross-section.
[0005] In addition, the truss node with variable cross-section chord bending provided in this application may also have the following additional technical features: In one alternative embodiment, the connecting chord further includes a first stiffening plate and a second stiffening plate, the first stiffening plate and the second stiffening plate being located at opposite ends of the third wall along its length, and the first stiffening plate being fixedly connected to one end of the first wall and the third wall at the first cross-section, and the second stiffening plate being fixedly connected to one end of the second wall and the third wall at the second cross-section.
[0006] In one alternative embodiment, the third wall comprises a front plate, an upper plate, a rear plate, and a lower plate, wherein the front plate and the rear plate are opposite to each other, and the upper plate and the lower plate are opposite to each other; the front plate, the upper plate, the rear plate, and the lower plate are connected in sequence or formed by bending a single flat plate; the first stiffening plate is parallel to the second stiffening plate, and the first stiffening plate and the second stiffening plate are respectively perpendicular to the central axis of the second chord.
[0007] In one alternative, the central axis of the first chord is not parallel to the central axis of the second chord, and the angle between the central axis of the first chord and the central axis of the second chord is defined as α, then 90° < α < 180°.
[0008] In one alternative embodiment, both the first cavity and the second cavity have rectangular cross-sectional shapes, and the cross-sectional width of the first cavity is greater than the cross-sectional width of the second cavity.
[0009] The beneficial effects of this application are as follows: The truss node with the variable cross-section chord bending in this application connects the first and second chords with different cross-sectional areas through the connecting chords of the variable diameter structure. This makes the transition between node domains smoother, avoids the generation of spatially different panel components, thereby reducing stress in the node transition area and reducing the difficulty of processing.
[0010] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description
[0011] Figure 1 A schematic diagram of the overall connection structure of the truss node provided in this application; Figure 2 for Figure 1 A partially exploded structural diagram of the middle truss node at the connecting chord structure; Figure 3 for Figure 1 A front view structural diagram of the middle truss node; Figure 4 for Figure 1 A top view of the central truss node.
[0012] Reference numerals: First chord 1, First wall 11, Second chord 2, Second wall 21, Connecting chord 3, Third wall 31, First section 32, Second section 33, First stiffening plate 34, Second stiffening plate 35, Front plate 36, Upper plate 37, Rear plate 38, Lower plate 39.
[0013] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation
[0014] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.
[0015] It should be understood that the described embodiments are merely some embodiments of this application, and not all embodiments. All other technical solutions obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0016] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.
[0017] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.
[0018] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.
[0019] like Figure 1-4As shown in the figure, this application embodiment provides a truss node with a variable cross-section chord bending. This truss node with a variable cross-section chord bending mainly includes a first chord 1, a second chord 2, and a connecting chord 3. The first chord 1 includes a first wall 11 and a first cavity formed by the first wall 11; the second chord 2 includes a second wall 21 and a second cavity formed by the second wall 21, and the cross-sectional area of the second cavity is smaller than the cross-sectional area of the first cavity; the connecting chord 3 includes a third wall 31 and a third cavity formed by the third wall 31. The third wall 31 has a first cross-section 32 at one end in the length direction and a second cross-section 33 at the other end in the length direction. The area of the first cross-section 32 is the same as the cross-sectional area of the first cavity, and the area of the second cross-section 33 is the same as the cross-sectional area of the second cavity. The cross-sectional area of the third cavity decreases linearly from the first cross-section 32 to the second cross-section 33; the connecting chord 3 is connected to the first chord 1 at one end of the first cross-section 32 and to the second chord 2 at one end of the second cross-section 33.
[0020] In this embodiment, the truss node with the variable cross-section chord bending is connected to the first chord 1 and the second chord 2, which have different cross-sectional areas, through the connecting chord 3 of the variable diameter structure. This achieves the truss chord bending effect, making the transition between node regions smoother and avoiding the generation of spatially dissimilar panel components. This reduces stress in the node transition area and lowers the processing difficulty. Furthermore, the connection between the first chord 1, the second chord 2, and the connecting chord 3 is a welded connection to ensure connection strength and stiffness.
[0021] like Figure 1-4 As shown, in one specific embodiment, the connecting chord 3 further includes a first stiffening plate 34 and a second stiffening plate 35. The first stiffening plate 34 and the second stiffening plate 35 are respectively located at both ends of the third wall 31 along its length. The first stiffening plate 34 is fixedly connected to one end of the first section 32 of the first wall 11 and the third wall 31, and the second stiffening plate 35 is fixedly connected to one end of the second section 33 of the second wall 21 and the third wall 31. In addition, the third wall 31 includes a front plate 36, an upper plate 37, a rear plate 38, and a lower plate 39. The front plate 36 and the rear plate 38 are opposite to each other, and the upper plate 37 and the lower plate 39 are opposite to each other. The front plate 36, the upper plate 37, the rear plate 38, and the lower plate 39 are connected in sequence or formed by bending a single flat plate. The first stiffening plate 34 is parallel to the second stiffening plate 35, and the first stiffening plate 34 and the second stiffening plate 35 are respectively perpendicular to the central axis of the second chord 2.
[0022] like Figure 1-4 As shown, in one specific embodiment, the central axis of the first chord 1 is not parallel to the central axis of the second chord 2. The angle between the central axis of the first chord 1 and the central axis of the second chord 2 is defined as α, then 90° < α < 180°. The cross-sectional shape of both the first cavity and the second cavity is rectangular, and the cross-sectional width of the first cavity is greater than the cross-sectional width of the second cavity.
[0023] In this embodiment, the connecting chord 3 is a truncated pyramid, composed of a front plate 36, a rear plate 38, an upper plate 37, a lower plate 39, a first stiffening plate 34, and a second stiffening plate 35. The planes containing the first stiffening plate 34 and the second stiffening plate 35 are parallel, therefore, the side lines of the first chord 1 and the second chord 2 are in the same plane. During connection, the first stiffening plate 34 connects to the first chord 1, and the second stiffening plate 35 connects to the second chord 2. The stiffening ribs, acting as stiffeners in the node region, effectively improve the load-bearing capacity of the node region and improve the stress distribution at the node. Furthermore, in this embodiment, the planes containing the first and second stiffening plates 35 are perpendicular to the axis of the second chord 2, ensuring that the front plate 36 and the rear plate 38 of the variable cross-section cavity are coplanar, making them standard planar plates. This results in smooth stress transition in the node region, convenient processing and manufacturing, and avoids the drawbacks of non-standard plate components.
[0024] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A truss joint with a variable cross-section chord bending, characterized in that, include: A first chord, the first chord including a first wall and a first cavity formed by the first wall; The second chord includes a second wall and a second cavity formed by the second wall, and the cross-sectional area of the second cavity is smaller than the cross-sectional area of the first cavity; A connecting chord includes a third wall and a third cavity enclosed by the third wall. The third wall has a first cross-section at one end along its length and a second cross-section at the other end along its length. The area of the first cross-section is the same as the cross-sectional area of the first cavity, and the area of the second cross-section is the same as the cross-sectional area of the second cavity. The cross-sectional area of the third cavity decreases linearly from the first cross-section to the second cross-section. The connecting chord is connected to the first chord at one end of the first cross-section and to the second chord at one end of the second cross-section.
2. The truss node with a variable cross-section chord bending according to claim 1, characterized in that, The connecting chord also includes a first stiffening plate and a second stiffening plate, which are located at the two ends of the third wall along the length direction, respectively. The first stiffening plate is fixedly connected to one end of the first wall and the third wall at the first cross-section, and the second stiffening plate is fixedly connected to one end of the second wall and the third wall at the second cross-section.
3. The truss node with a variable cross-section chord bending according to claim 2, characterized in that, The third wall includes a front plate, an upper plate, a rear plate, and a lower plate, with the front plate and the rear plate facing each other, and the upper plate and the lower plate facing each other; the front plate, the upper plate, the rear plate, and the lower plate are connected in sequence or formed by bending a single flat plate; the first stiffening plate is parallel to the second stiffening plate, and the first stiffening plate and the second stiffening plate are perpendicular to the central axis of the second chord.
4. The truss node with a bent chord member according to any one of claims 1-3, characterized in that, The central axis of the first chord is not parallel to the central axis of the second chord. The angle between the central axis of the first chord and the central axis of the second chord is defined as α. Then, 90° < α < 180°.
5. The truss node with a bent chord member according to any one of claims 1-3, characterized in that, Both the first cavity and the second cavity have rectangular cross-sectional shapes, and the cross-sectional width of the first cavity is greater than that of the second cavity.