Steel truss node structure
By designing the steel truss node structure, the superposition of multiple welds is avoided, which solves the problems of heat-affected zone superposition effect and uncontrollable welding quality of traditional steel truss nodes, improves the toughness and stress uniformity of the node area, and increases fatigue life and construction operability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CITIC GENERAL INST OF ARCHITECTURAL DESIGN & RES
- Filing Date
- 2025-05-22
- Publication Date
- 2026-04-24
AI Technical Summary
Traditional steel truss node structures suffer from the superposition effect of heat-affected zones, uncontrollable welding quality, deterioration of mechanical properties, and detectable defects at the intersection of multiple members, leading to brittle fracture and reduced fatigue life.
Design a steel truss node structure in which the web plates of the diagonal web members do not extend to the intersection area of the web plates of the vertical web members and the flange extension plates of the chord members. The diagonal web members, vertical web members and chord members are connected by bevel welds. The combination of diagonal web members, vertical web members and chord members forms an open structure, avoiding the superposition of multiple welds and enhancing the toughness and stress uniformity of the node area.
It effectively eliminated the superposition effect of the heat-affected zone, improved the toughness and stress uniformity of the joint area, reduced the peak value of the composite stress, improved the fatigue life and construction operability of the joint, and achieved full coverage of non-destructive testing.
Smart Images
Figure CN224161197U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of steel structure node technology, and specifically relates to a steel truss node structure. Background Technology
[0002] Steel truss nodes are the key joints connecting various members in a truss structure. They are used to combine members into a geometrically stable whole through welding, bolting, or riveting, ensuring that loads are effectively transferred and forces are coordinated through the nodes.
[0003] Traditional node construction adopts a welding method in which the web plates of the web members extend continuously to the web plates of the chord members. In complex spatial truss structures, the following technical bottlenecks exist: (1) Heat-affected zone superposition effect: Dense welding in the intersection area of multiple members leads to excessive local heat input, which induces the deterioration of microstructure and the low-temperature brittle transition temperature of the carbon equivalent enrichment area increases significantly, which makes the node area have a safety hazard of brittle fracture under cold working conditions; (2) Uncontrollable welding quality: The construction of multi-directional fillet welds in confined space is prone to process defects, including Class II defects such as incomplete penetration, slag inclusion and porosity, and the coupling effect of the three-dimensional residual stress field leads to an abnormal increase in the stress concentration coefficient of the node area; (3) Deterioration of mechanical properties: The deviation of the intersection of the members' axes causes an additional bending moment effect, which makes the weld area bear the combined stress, significantly reducing the fatigue life of the node (the slope of the SN curve increases); (4) Inspectable defects: Existing NDT non-destructive testing methods are difficult to achieve full cross-section flaw detection coverage of the overlapping area of multiple welds.
[0004] Therefore, there is an urgent need to develop a steel truss node structure to solve the above problems. Utility Model Content
[0005] This utility model addresses the technical problems existing in the prior art by providing a steel truss node structure in which the web extension plate of the diagonal web member does not extend to the intersection area of the web extension plate of the vertical web member and the flange extension plate of the chord member, thus solving the technical problem of overlapping welds at the truss node at the intersection of traditional multi-member members.
[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:
[0007] A steel truss node structure includes a truss node region, vertical web members, two diagonal web members, and two chord members; the truss node region includes:
[0008] The chord flange extension plate is horizontally set and extends in the left and right direction. Its left and right ends are respectively coaxially butt-welded to the chord and are coplanarly connected with the chord.
[0009] The web extension plate of the vertical web member is vertically set, with its lower end perpendicularly intersecting and passing through the middle of the flange extension plate of the chord member, and its upper end being coaxially butt-welded to the vertical web member and coplanarly connected with the vertical web member.
[0010] Two diagonal web extension plates are symmetrically arranged on the left and right, extending diagonally upward from the intersection area of the vertical web extension plate and the chord flange extension plate, respectively. The upper ends are coaxially butt-welded to the web of the corresponding diagonal web and are coplanarly connected with the diagonal web. The lower ends of the diagonal web extension plates are connected to the intersection area of the vertical web extension plate and the chord flange extension plate through a transition area.
[0011] Based on the above technical solution, the present invention can be further improved as follows.
[0012] Furthermore, the lower edge of the web extension plate of the diagonal brace and the flange extension plate of the chord maintain a vertical distance of 100-250mm.
[0013] Furthermore, the cross-sectional area of the web extension plate of the diagonal web member is smaller than the cross-sectional area of the transition zone.
[0014] Furthermore, the outer edge of the diagonal web extension plate is connected to the chord flange extension plate via a continuous arc transition in the transition zone.
[0015] Furthermore, the cross-sections of the diagonal web members, the vertical web members, and the chord members are box-shaped or H-shaped.
[0016] Furthermore, the diagonal web member is integrally welded from the web plate and the flange of the diagonal web member, and the diagonal web member is connected to the extension plate of the web plate of the diagonal web member through a bevel weld.
[0017] Furthermore, the vertical web member is integrally welded from the web plate and the flange of the vertical web member, and the vertical web member is connected to the extension plate of the web plate of the vertical web member through a bevel weld.
[0018] Furthermore, the chord is integrally welded from the chord web and the chord flange, and the chord is connected to the chord flange extension plate through a bevel weld.
[0019] Furthermore, the truss node domain is a node that is integrally welded or integrally cast steel.
[0020] The beneficial effects of this utility model are:
[0021] This invention designs truss node regions that are welded to vertical web members, diagonal web members, and chord members respectively. The diagonal web extension plates of the truss node regions do not extend to the intersection area of the vertical web extension plates and the chord flange extension plates. This design effectively eliminates the heat-affected zone superposition effect by avoiding multiple weld overlaps, significantly improving the toughness of the node region. Simultaneously, it suppresses the additional bending moment effect caused by the deviation of the member axes, reduces the combined stress in the weld region, thereby reducing the peak value of welding residual stress and improving the stress uniformity of the node region, eliminating eccentric additional bending moments. Furthermore, the reasonable maintenance of vertical spacing and the open structural design not only achieve 100% ultrasonic testing coverage but also further enhance the operability of construction welding. Attached Figure Description
[0022] Figure 1 This is a front view of the steel truss node structure described in an embodiment of the present utility model;
[0023] Figure 2 This is a perspective view of the steel truss node structure described in an embodiment of the present utility model;
[0024] Figure 3 This is a schematic cross-sectional view of the chord as described in an embodiment of the present utility model;
[0025] Figure 4 This is a schematic cross-sectional view of the vertical web member described in an embodiment of this utility model.
[0026] The attached diagram lists the components represented by each number as follows:
[0027] 1. Chord member, 2. Vertical web member, 3. Diagonal web member, 4. Diagonal web member web extension plate, 5. Vertical web member web extension plate, 6. Chord member flange extension plate, 7. Node plate, 8. Transition zone, 9. Bolt. Detailed Implementation
[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0029] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0030] In the description of this application, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to implement and use the present invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the present invention can be implemented without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the present invention with unnecessary detail. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.
[0031] Example
[0032] A steel truss node structure includes a truss node region, vertical web members 2, two diagonal web members 3, and two chord members 1; the truss node region includes chord flange extension plates 6, vertical web member web extension plates 5, and two diagonal web member web extension plates 4;
[0033] The chord flange extension plate 6 is horizontally arranged and extends in the left and right direction. Its left and right ends are respectively coaxially connected to the chord 1 and connected through a bevel weld, and are coplanar with the chord 1.
[0034] The vertical web extension plate 5 is vertically arranged, with its lower end perpendicularly intersecting and penetrating the middle part of the chord flange extension plate 6, and its upper end coaxially connected to the vertical web 2 and connected by a bevel weld, and coplanarly connected with the vertical web 2.
[0035] The two diagonal web extension plates 4 are symmetrically arranged on the left and right, extending diagonally upward from the intersection area of the vertical web extension plate 5 and the chord flange extension plate 6, respectively. The upper end is coaxially connected to the web of the corresponding diagonal web 3 and connected by a bevel weld, and is coplanar with the diagonal web 3. The lower end of the diagonal web extension plate 4 is connected to the intersection area of the vertical web extension plate 5 and the chord flange extension plate 6 through the transition area 8.
[0036] The diagonal web member 3 is integrally welded from the web plate and the flange of the diagonal web member 3; the vertical web member 2 is integrally welded from the web plate and the flange of the vertical web member 2; the chord member 1 is integrally welded from the web plate and the flange of the chord member 1; the cross-section of the diagonal web member 3 is H-shaped, and the cross-sections of the vertical web member 2 and the chord member 1 are box-shaped.
[0037] The truss node domain is a node that is welded in the factory.
[0038] In a preferred embodiment, the lower edge of the web extension plate 4 of the diagonal web member and the flange extension plate 6 of the chord member maintain a vertical distance of 100mm. This distance provides sufficient operating space for welding operations and ensures the penetration quality of the groove weld. At the same time, this distance reduces the damage to the base material caused by welding heat input by controlling the length of the heat-affected zone. Moreover, the distance is determined based on the local stability calculation of the node plate 7, forming an effective out-of-plane support distance, which further improves the stability and construction reliability of the node.
[0039] In a preferred embodiment, the cross-sectional area of the diagonal web extension plate 4 is smaller than the cross-sectional area of the transition zone 8. Considering the hinged force transmission characteristics of the truss web members and chord members 1, by designing the cross-sectional area of the diagonal web extension plate 4 to be smaller than that of the transition zone 8, it is ensured that the tensile and compressive bearing capacities of the joint connection area, i.e., the transition zone 8, are both higher than the bearing capacity of the web member itself. This achieves the design concept of "strong joints, weak members," preventing joint failure before the member failure.
[0040] In a preferred embodiment, the outer edge of the diagonal web extension plate 4, which connects to the chord flange extension plate 6 via the transition zone 8, adopts a continuous circular arc transition. The continuous circular arc transition in the transition zone 8 eliminates stress concentration caused by sharp angles, further optimizes the stress distribution path, and improves the fatigue resistance of the joint.
[0041] The working process of this embodiment is as follows:
[0042] Factory prefabrication stage:
[0043] Truss node formation: The truss node adopts an integral welding process to integrate the chord flange extension plate 6, the vertical web member web extension plate 5, and the diagonal web member web extension plate 4 into the truss node, ensuring geometric accuracy and dimensional matching; among them, the diagonal web member web extension plate 4 is welded into an H-section member; the vertical web member web extension plate 5 and the chord flange extension plate 6 are welded into a box-section member.
[0044] Prefabricated members in separate sections: the diagonal web member 3 is integrally welded from the web plate and flange of the diagonal web member 3 to form an H-section member; the vertical web member 2 is integrally welded from the web plate and flange of the vertical web member 2 to form a box-section member; the chord member 1 is integrally welded from the web plate and flange of the chord member 1 to form a box-section member.
[0045] On-site assembly stage:
[0046] The chord member 1 is temporarily positioned to the truss node area by installing node plate 7 and bolts 9, and then connected by bevel weld. The web extension plate 5 of the vertical web member is connected to the vertical web member 2 by bevel weld, and the web extension plate 4 of the diagonal web member is connected to the diagonal web member 3 by bevel weld.
[0047] While embodiments or examples of this disclosure have been described with reference to the accompanying drawings, it should be understood that the methods, systems, and devices described above are merely exemplary embodiments or examples, and the scope of this utility model is not limited by these embodiments or examples, but only by the granted claims and their equivalents. Various elements in the embodiments or examples may be omitted or replaced by their equivalents. Furthermore, the steps may be performed in a different order than that described in this disclosure. Further, various elements in the embodiments or examples may be combined in various ways. Importantly, as technology evolves, many elements described herein can be replaced by equivalents that appear after this disclosure.
Claims
1. A steel truss node structure, characterized in that, It includes a truss node region, vertical web members, two diagonal web members, and two chord members; the truss node region includes: The chord flange extension plate is horizontally set and extends in the left and right direction. Its left and right ends are respectively coaxially butt-welded to the chord and are coplanarly connected with the chord. The web extension plate of the vertical web member is vertically set, with its lower end perpendicularly intersecting and passing through the middle of the flange extension plate of the chord member, and its upper end being coaxially butt-welded to the vertical web member and coplanarly connected with the vertical web member. Two diagonal web extension plates are symmetrically arranged on the left and right, extending diagonally upward from the intersection area of the vertical web extension plate and the chord flange extension plate, respectively. The upper ends are coaxially butt-welded to the web of the corresponding diagonal web and are coplanarly connected with the diagonal web. The lower ends of the diagonal web extension plates are connected to the intersection area of the vertical web extension plate and the chord flange extension plate through a transition area.
2. The steel truss node structure according to claim 1, characterized in that, The lower edge of the web extension plate of the diagonal brace and the flange extension plate of the chord maintain a vertical distance of 100-250mm.
3. The steel truss node structure according to claim 1, characterized in that, The cross-sectional area of the web extension plate of the diagonal web member is smaller than the cross-sectional area of the transition zone.
4. The steel truss node structure according to claim 1, characterized in that, The web extension plate of the diagonal brace transitions to the outer edge of the chord flange extension plate via the transition zone using a continuous circular arc.
5. The steel truss node structure according to claim 1, characterized in that, The cross-sections of the diagonal web members, the vertical web members, and the chord members are box-shaped or H-shaped.
6. The steel truss node structure according to claim 1, characterized in that, The diagonal web member is integrally welded from the web plate and the flange of the diagonal web member, and the diagonal web member is connected to the extension plate of the web plate of the diagonal web member through a bevel weld.
7. The steel truss node structure according to claim 1, characterized in that, The vertical web member is integrally welded from the web plate and the flange of the vertical web member, and the vertical web member is connected to the extension plate of the web plate of the vertical web member through a bevel weld.
8. The steel truss node structure according to claim 1, characterized in that, The chord is integrally welded from the chord web and the chord flange, and the chord is connected to the chord flange extension plate through a bevel weld.
9. The steel truss node structure according to claim 1, characterized in that, The truss node domain consists of nodes that are either factory-welded or integrally cast steel.