Small angle cross steel truss connection joint

Abstract

This utility model discloses a small-angle intersecting steel truss connection node, including an intersecting combined lower chord, an intersecting combined upper chord, a central straight web member, a multi-layer truss intersecting diagonal web member, a multi-layer truss web member, a multi-layer truss upper web member, a single-layer truss intersecting diagonal web member, and a single-layer truss web member. The central web member, serving as a shared straight web member for two trusses, is located at the center point of the intersection of the multi-layer truss and the single-layer truss, with its upper and lower ends fixedly connected to the intersecting combined upper chord and the intersecting combined lower chord, respectively. The intersecting combined lower chord has the same structure as the intersecting combined upper chord, and is an irregularly shaped cross-section composite chord constructed by the small-angle intersection of the lower chord of the multi-layer truss and the lower chord of the single-layer truss. This application avoids the stress concentration problem in the small-angle intersection area of ​​the members. At the same time, after the flange is widened, the dense intersection of truss members at the center of the node is dispersed, the overlapping of welds is reduced, and the stress concentration at the intersection of the three trusses is lowered.

Description

Technical Field

[0001] This utility model relates to the technical field of steel structure construction, and in particular to a small-angle cross steel truss connection node. Background Technology

[0002] With the booming development of modern large-span public buildings, the spatial layout of large public buildings is becoming increasingly complex. In pursuit of functionality and visual impact, architecture demands that structures not only cover column-free spaces exceeding 100 meters in span but also achieve spatial division between different upper and lower levels. This demand has directly driven the widespread application of large-span steel truss systems. The complex support requirements place higher demands on the load-bearing capacity, stiffness, and deformation of large-span truss systems. In particular, column-supporting trusses that simultaneously cover the lower large-span space and support the upper structure should ideally be designed as multi-layered trusses to ensure the structural system's safety and reliability. The complex spatial division leads to the use of steel trusses with varying spans, numbers of stories, and orientations in the supporting truss system. Furthermore, this results in truss systems intersecting at small angles, forming small-angle intersecting steel truss connection nodes with different numbers of stories across ultra-large spans.

[0003] The nodal area bears internal forces from truss members in multiple planes and at different angles, as well as enormous concentrated forces from the upper spatial structural columns, resulting in an extremely complex stress state. Traditional connection methods typically use a truss chord in one direction as the main member, with the remaining web members and chord members welded to the main member. However, the applicant's stress analysis revealed that this traditional connection method easily leads to severe stress concentration in areas where multiple members intersect at small angles, causing structural failure even under loads far below the bearing capacity, making it difficult to guarantee connection strength. Furthermore, with traditional connection methods, different truss diagonal web members are prone to crossing and colliding, and the welds of multiple members in the nodal area overlap and intersect, making it difficult to guarantee welding quality. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a small-angle cross steel truss connection node.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This utility model relates to a small-angle cross steel truss connection node, which is used to reliably connect a multi-layer truss with a small-angle cross to a single-layer truss. It includes a cross-combined lower chord, a cross-combined upper chord, a central straight web member, a multi-layer truss cross diagonal web member, a multi-layer truss web member, a multi-layer truss upper web member, a single-layer truss cross diagonal web member, and a single-layer truss web member. The central web member serves as a shared straight web member for two trusses. It is located at the center point where the multi-layer truss and the single-layer truss intersect, and its upper and lower ends are fixedly connected to the upper chord and the lower chord of the cross combination, respectively. The cross-combined lower chord has the same structure as the cross-combined upper chord. It is an irregular cross-section composite chord constructed by the lower chord of a multi-layer truss and the lower chord of a single-layer truss intersecting at a small angle. The upper end of the cross diagonal web member of the multi-layer truss is fixedly connected to the intersection of the cross combination upper chord and the central straight web member. It extends from the upper end of the central straight web member along the direction of the multi-layer truss to both sides, and the lower end is fixedly connected to the intersection of the cross combination lower chord and the web member of the multi-layer truss. The lower end of the cross diagonal web member of the single-layer truss is fixedly connected to the intersection of the lower chord of the cross combination and the central straight web member. It extends from the lower end of the central straight web member along the direction of the single-layer truss to both sides, and the upper end is fixedly connected to the intersection of the upper chord of the cross combination and the web member of the single-layer truss. The upper web members of the multi-layer truss are located directly above the central straight web members and are fixedly connected to the cross-combined upper chord members to connect the space frame structure.

[0006] In this utility model, the small-angle cross steel truss connection node is further described in that the cross combined lower chord has the same structure as the cross combined upper chord. The cross combined lower chord is connected in the direction of the lower chord of the multi-layer truss. The lower chord of the single-layer truss is disconnected at the intersection with the lower chord of the multi-layer truss and is fixedly connected to the lower chord of the multi-layer truss at the intersection edge.

[0007] In this utility model, the flange plate of the cross-shaped steel truss connection node at a small angle is further divided into an intermediate flange plate along the direction of the multi-layer truss chord and a lateral flange plate along the direction of the single-layer truss chord. The lateral flange plate extends beyond the lateral inner web and lateral outer web of the single-layer truss lower chord, extending inward to the side wall of the intermediate web of the multi-layer truss lower chord and fixedly connected to the side wall, and extending outward to the minimum width of the cross-shaped steel truss lower chord section, which is not less than the sum of the flange widths of the multi-layer truss lower chord and the single-layer truss lower chord.

[0008] In this utility model, the small-angle cross steel truss connection node further includes the multi-layer truss cross diagonal web members and the single-layer truss cross diagonal web members being aligned with the outer side of the central straight web member at their connection positions.

[0009] In this utility model, the small-angle cross steel truss connection node further defines the web plate in the direction of the chord of the multi-layer truss as the intermediate web plate, the web plate in the direction of the chord of the single-layer truss that is close to the intermediate web plate as the inner lateral web plate, and the web plate that is far from the intermediate web plate as the outer lateral web plate. The intermediate web plate extends upward and downward from the flange plate of the multi-layer truss chord by a distance equal to the thickness of the intermediate web plate.

[0010] In this utility model, a small-angle cross steel truss connection node is further provided with distributed stiffening plates arranged at a certain interval between the two intermediate web plates in the disconnected area of ​​the lateral inner web plate and the lateral outer web plate. The distributed stiffening plates are fixedly connected perpendicular to the inner wall of the intermediate web plate and the intermediate flange plate.

[0011] In this utility model, a small-angle cross steel truss connection node is further provided with a connecting stiffening plate inside the cross-combination lower chord cavity at the corresponding member connection position of each truss. The connecting stiffening plate is perpendicular to the inner wall of the cross-combination lower chord cavity and is fixedly connected to the inner wall of the cross-combination lower chord cavity.

[0012] In this utility model, the cross-sectional width of the central straight web member is increased, and the cross-diagonal web members of the multi-layer truss and the cross-diagonal web members of the single-layer truss are aligned with the outer side of the central straight web member at their connection positions.

[0013] Furthermore, in this utility model, a small-angle cross steel truss connection node is provided, wherein lateral secondary trusses are connected on both sides of the main truss formed by the connection of multi-layer trusses and single-layer trusses, and the lateral secondary trusses are fixedly connected at the intersection of the cross combined chord and the central straight web member of the main truss.

[0014] In this utility model, a small-angle cross steel truss connection node is further provided, wherein the lateral secondary truss includes lateral secondary truss chords and lateral secondary truss web members, and the cross-combined lower chord is provided with chord connecting plates on both sides of the center point where the multi-layer truss and the single-layer truss intersect. The chord connecting plates are arranged along the direction of the lateral secondary truss and are fixedly connected to the cross-combined lower chord; the lateral secondary truss chords are fixedly connected to the edge of the lateral flange plate and the chord connecting plates.

[0015] Compared with the prior art, this utility model has the following advantages: 1. By constructing a cross-sectional composite chord with multi-layer truss chords that intersect at small angles and single-layer truss chords, and by widening and extending the flanges of the composite chords, the stress concentration problem in the small-angle intersection area of ​​the members is avoided. At the same time, after the flanges are widened, the dense intersection of truss members at the node center is dispersed, the overlapping of welds is reduced, and the stress concentration at the intersection of the three trusses is reduced. 2. Install distributed stiffening plates to reinforce the broken positions of the lower chord of the single-layer truss in the cross-combined chord to ensure the continuous load transfer of the single-layer truss chord; 3. By dividing the flange plate of the cross-combined lower chord into an intermediate flange plate and a lateral flange plate using an intermediate web plate, the problem of small welding space between the internal web plate and flange of the cross-combined lower chord, and between the stiffening plate and the inner wall of the member, is solved, thus ensuring welding quality; 4. The innovative cross-combined chords and central straight web members together form a robust three-dimensional force transmission core. By constructing a large-section central straight web member, and simultaneously using a spatially staggered, non-intersecting cross-web member arrangement for single-layer and multi-layer truss cross-web members, it ensures that loads from the truss in three directions can be clearly and directly transmitted, avoiding the ambiguity or detours that may occur in traditional nodes; it also avoids the convergence and collision of multiple diagonal web members and the overlapping of welds, ensuring a clear and non-concentrated load transmission path for the truss.

[0016] The present invention will be further described below with reference to the accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is an isometric schematic diagram of the interconnections between the various truss members; Figure 3 This is a top view of the lower chord position; Figure 4 This is a side view of the position of the central straight web member.

[0018] Figure label: 1. Cross-combined lower chord; 11. Intermediate flange plate; 12. Lateral flange plate; 13. Intermediate web plate; 14. Lateral inner web plate; 15. Lateral outer web plate; 16. Distributed stiffening plate; 17. Connecting stiffening plate; 18. Chord connecting plate; 2. Cross-combined upper chord; 3. Central straight web member; 4. Multi-layer truss; 41. Multi-layer truss cross-diagonal web member; 42. Multi-layer truss web member; 43. Multi-layer truss upper web member; 5. Single-layer truss; 51. Single-layer truss cross-diagonal web member; 52. Single-layer truss web member; 6. Lateral secondary truss; 61. Lateral secondary truss chord member; 62. Lateral secondary truss web member. Detailed Implementation

[0019] like Figure 1 As shown, this utility model discloses a small-angle cross steel truss connection node, which is used to reliably connect the multi-layer truss 4 with the single-layer truss 5 with small-angle cross, and at the same time connect the lateral secondary truss 6 with the two main trusses with small-angle cross.

[0020] Here, the multi-layer truss 4, the single-layer truss 5, and the lateral secondary truss 6 intersect at a single point. The single-layer truss 5 and the lateral secondary truss 6 intersect with the lower chord and middle chord of the multi-layer truss 4. In this embodiment, all three truss members are box-shaped, and the upper part of the multi-layer truss 4 supports the roof space frame.

[0021] like Figure 1-2As shown, the connecting structure includes a cross-combined lower chord 1, a cross-combined upper chord 2, a central straight web member 3, a multi-layer truss cross-diagonal web member 41, a multi-layer truss web member 42, a multi-layer truss upper web member 43, a single-layer truss cross-diagonal web member 51, a single-layer truss web member 52, and a lateral secondary truss 6.

[0022] The cross-combined lower chord 1 is located at the lower chord position of the multi-layer truss 4 and the single-layer truss 5. It is an irregularly shaped cross-section composite chord constructed by the intersection of the lower chord of the multi-layer truss and the lower chord of the single-layer truss at a small angle. Similarly, the corresponding upper chord position is denoted as the cross-combined upper chord 2. The central straight web member 3 is located at the center point of the intersection of the multi-layer truss 4 and the single-layer truss 5. Its upper and lower ends are fixedly connected to the cross-combined upper chord 2 and the cross-combined lower chord 1, respectively, serving as a common straight web member for the two trusses. The lateral secondary truss 6 is fixedly connected at the intersection of the cross-combined chord and the central straight web member 3, including the lateral secondary truss chord 61 and the lateral secondary truss web member 62.

[0023] like Figure 3 As shown, the lower chord 1 of the cross-combined structure is connected in the direction of the lower chord of the multi-layer truss 4. The web of the lower chord of the single-layer truss 5 is broken at the intersection. The web along the chord direction of the multi-layer truss 4 is designated as the intermediate web 13, the web along the chord direction of the single-layer truss 5 that is closer to the intermediate web 13 is designated as the lateral inner web 14, and the web further away from the intermediate web 13 is designated as the lateral outer web 15. To ensure the welding space and welding quality of the welds of the inner web and stiffening plates of the cross-combined lower chord 1, the intermediate web 13 extends upward and downward by a distance equal to the thickness of one web plate, dividing the flange of the cross-combined lower chord 1 into the intermediate flange 11 along the chord direction of the multi-layer truss 4 and the lateral flange 12 along the chord direction of the single-layer truss 5. The webs and flanges are fixedly connected at the intersection edge.

[0024] To disperse the truss load and members, and reduce stress concentration at the intersection of the three trusses, the lateral flange plate 12 of the lower chord 1 of the cross combination extends beyond the lateral inner web plate 13 and the lateral outer web plate 14, extending inward to the side wall of the middle web plate 13 and being fixedly connected to the side wall, and extending outward to a minimum width of not less than the sum of the flange widths of the lower chord of the multi-layer truss 4 and the lower chord of the single-layer truss 5. At the same time, after the width of the cross combination lower chord 1 is extended, the truss members at the intersection of the three trusses are dispersed, reducing the overlap of welds and further ensuring welding quality.

[0025] To ensure continuous load transmission in the lower chord of the single-layer truss 5, the cross-combined lower chord 1 has distributed stiffening plates 16 arranged at a certain interval between the two intermediate webs 13 in the disconnected area of ​​the lateral inner web 14 and the lateral outer web 15. The distributed stiffening plates 16 are perpendicular to the intermediate webs 13 and the intermediate flanges 11, and their edges are fixedly connected to the inner walls of the intermediate webs 13 and the intermediate flanges 11.

[0026] A connecting stiffening plate 17 is provided in the cavity of the cross-combined lower chord 1 at the corresponding connection position of each truss member. The connecting stiffening plate 17 is perpendicular to the inner wall of the cavity of the cross-combined lower chord 1 and is fixedly connected to the inner wall of the cavity of the cross-combined lower chord 1.

[0027] Furthermore, the cross-combined upper chord 2 and the cross-combined lower chord 1 are connected in the same manner.

[0028] The multi-layer truss cross diagonal web member 41 is fixedly connected at the upper end to the intersection of the cross combined upper chord 2 and the central straight web member 3, extends from the upper end of the central straight web member 3 along the direction of the multi-layer truss 4 to both sides, and is fixedly connected at the lower end to the intersection of the cross combined lower chord 1 and the multi-layer truss web member 42; the single-layer truss cross diagonal web member 51 is fixedly connected at the lower end to the intersection of the cross combined lower chord 1 and the central straight web member 3, extends from the lower end of the central straight web member 3 along the direction of the single-layer truss 5 to both sides, and is fixedly connected at the upper end to the intersection of the cross combined upper chord 2 and the single-layer truss web member 52; this achieves spatial staggered intersection of the multi-layer truss cross diagonal web member 41 and the single-layer truss cross diagonal web member 42 without intersecting, avoiding collisions between multiple members and ensuring a clear and non-concentrated load transfer path for the truss.

[0029] like Figure 2 , Figure 4 As shown, in order to ensure that the intersecting diagonal web members do not intersect in space, the cross section of the central straight web member needs to have sufficient width. The intersecting diagonal web members 41 of the multi-layer truss and the intersecting diagonal web members 51 of the single-layer truss are aligned with the outer side of the central straight web member 3 at the connection position with the central straight web member 3.

[0030] The lower chord 1 of the cross-combination is provided with chord connecting plates 18 on both sides of the center point where the multi-layer truss 4 and the single-layer truss 5 intersect. The chord connecting plates 18 are set along the direction of the lateral secondary truss 6 and are fixedly connected to the lower chord 1 of the cross-combination. The lateral secondary truss chord 61 is fixedly connected to the edge of the lateral flange plate of the lower chord 1 of the cross-combination and the chord connecting plate 18. The lateral secondary truss web member 62 is connected to the central straight web member 3 and the lateral flange plate of the lower chord 1 of the cross-combination.

[0031] The upper web member 43 of the multi-layer truss is located directly above the central straight web member 3 and is fixedly connected to the upper surface of the cross-combined upper chord member 2.

[0032] The diagonal web members of each truss are enlarged at both ends of the connection and fixing position to distribute the load and strengthen the connection.

[0033] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A small-angle intersecting steel truss connection node, used to reliably connect a multi-layer truss (4) with a single-layer truss (5) at a small angle, characterized in that, It includes cross-combined lower chord (1), cross-combined upper chord (2), central straight web member (3), multi-layer truss cross diagonal web member (41), multi-layer truss web member (42), multi-layer truss upper web member (43), single-layer truss cross diagonal web member (51) and single-layer truss web member (52). The central straight web member (3) serves as the common straight web member of the two trusses. It is set at the center point where the multi-layer truss (4) and the single-layer truss (5) intersect. Its upper and lower ends are fixedly connected to the upper chord (2) and the lower chord (1) of the cross combination, respectively. The cross-combined lower chord (1) has the same structure as the cross-combined upper chord (2). It is a composite chord with an irregular cross section constructed by the lower chord of the multi-layer truss (4) and the lower chord of the single-layer truss (5) intersecting at a small angle. The upper end of the cross diagonal web member (41) of the multi-layer truss is fixedly connected to the intersection of the cross combination upper chord (2) and the central straight web member (3), and extends from the upper end of the central straight web member (3) along the direction of the multi-layer truss (4) to both sides, and the lower end is fixedly connected to the intersection of the cross combination lower chord (1) and the multi-layer truss web member (42). The lower end of the single-layer truss cross diagonal web member (51) is fixedly connected to the intersection of the cross combination lower chord member (1) and the central straight web member (3), and extends from the lower end of the central straight web member (3) along the direction of the single-layer truss (5) to both sides, and the upper end is fixedly connected to the intersection of the cross combination upper chord member (2) and the single-layer truss web member (52); The upper web member (43) of the multi-layer truss is located directly above the central straight web member (3) and is fixedly connected to the cross-combined upper chord member (2) to connect the space frame structure.

2. The small-angle cross steel truss connection node according to claim 1, characterized in that, The cross-combined lower chord (1) has the same structure as the cross-combined upper chord (2). The cross-combined lower chord (1) is connected in the direction of the lower chord of the multi-layer truss (4). The lower chord of the single-layer truss (5) is broken at the intersection with the lower chord of the multi-layer truss (4) and is fixedly connected to the lower chord of the multi-layer truss (4) at the intersection edge.

3. The small-angle intersecting steel truss connection node according to claim 1, characterized in that, The flange plate of the cross-combined lower chord (1) is divided into an intermediate flange plate (11) along the chord direction of the multi-layer truss (4) and a lateral flange plate (12) along the chord direction of the single-layer truss (5). The lateral flange plate (12) extends beyond the lateral inner web plate (14) and lateral outer web plate (15) of the lower chord of the single-layer truss (5), extending inward to the side wall of the intermediate web plate (13) of the lower chord of the multi-layer truss (4) and fixedly connected to the side wall. It extends outward to the minimum width of the cross-combined lower chord (1) section, which is not less than the sum of the flange widths of the lower chord of the multi-layer truss (4) and the lower chord of the single-layer truss (5).

4. The small-angle cross steel truss connection node according to claim 1, characterized in that, The multi-layer truss cross diagonal web members (41) and the single-layer truss cross diagonal web members (51) are aligned with the outer side of the central straight web member (3) at the connection position with the central straight web member (3).

5. The small-angle Xed steel truss connection node according to claim 1, wherein, The web of the multi-layer truss (4) in the chord direction is called the intermediate web (13). The webs of the single-layer truss (5) that are close to the intermediate web (13) are called the inner lateral webs (14), and the webs that are far from the intermediate web (13) are called the outer lateral webs (15). The intermediate web (13) extends upward and downward from the flange of the chord of the multi-layer truss (4) by a distance equal to the thickness of the intermediate web (13).

6. The small-angle X-steel truss connection node of claim 3, wherein, A distribution stiffening plate (16) is arranged at a certain interval between the two intermediate web plates (13) in the disconnected area of ​​the lateral inner web plate (14) and the lateral outer web plate (15). The distribution stiffening plate (16) is fixedly connected to the inner wall of the intermediate web plate (13) and the intermediate flange plate (11) perpendicular to it.

7. The small-angle Xed steel truss connection node according to claim 1, wherein, The cavity of the cross-combination lower chord (1) is provided with connecting stiffening plates (17) at the corresponding member connection positions of each truss. The connecting stiffening plates (17) are perpendicular to the inner wall of the cavity of the cross-combination lower chord (1) and are fixedly connected to the inner wall of the cavity of the cross-combination lower chord (1).

8. The small-angle Xed steel truss connection node according to claim 1, wherein, The cross-sectional width of the central straight web member (3) is increased. The multi-layer truss cross diagonal web members (41) and the single-layer truss cross diagonal web members (51) are aligned with the outer side of the central straight web member (3) at the connection position with the central straight web member (3).

9. The small-angle cross steel truss connection node according to claim 1, characterized in that, Lateral secondary trusses (6) are connected on both sides of the main truss formed by connecting the multi-layer truss (4) and the single-layer truss (5). The lateral secondary trusses (6) are fixedly connected at the intersection of the cross-combined chord and the central straight web member (3) of the main truss.

10. The small-angle cross steel truss connection node according to claim 9, characterized in that, The lateral secondary truss (6) includes lateral secondary truss (6) chords and lateral secondary truss (6) web members. The cross-combined lower chord (1) is provided with chord connecting plates (18) on both sides of the center point where the multi-layer truss (4) and the single-layer truss (5) intersect. The chord connecting plates (18) are arranged along the lateral secondary truss (6) direction and are fixedly connected to the cross-combined lower chord (1). The lateral secondary truss (6) chords are fixedly connected to the edge of the lateral flange plate (12) and the chord connecting plates (18).

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