A large-span steel truss supporting space frame system

Abstract

This utility model discloses a large-span steel truss supporting a space frame system, including steel columns, corbels, fixed hinge supports, support short columns, trusses, floor slabs, support columns, and a space frame. The truss is a single-layer truss, with both ends of the upper chord members fixedly connected to the support short columns. The support short columns are fixedly connected to the fixed hinge supports, which are then fixedly connected to the steel columns via corbels. Support columns are provided on the upper chord members of the truss, with their bottoms welded to the upper chord members and their tops hinged to the space frame. The floor slab is laid on the upper chord members of the truss. This application utilizes a support hinge truss system to support a large-span space frame structure, achieving the functionality of two large-span spaces above and below the truss using a single-layer large-span truss. The structural system is novel, and the flexibility of the hinge support nodes facilitates adjustments to the truss position and orientation during installation, improving construction efficiency and significantly shortening the construction period.

Description

Technical Field

[0001] This utility model relates to the technical field of steel structure construction, and in particular to a large-span steel truss supporting space frame system. Background Technology

[0002] Buildings like exhibition halls require a large space area and need to be built quickly when there is an exhibition need. Truss structures can meet both requirements of large span and fast construction, so truss structures are widely used in exhibition hall buildings.

[0003] Trusses possess high tensile / compressive strength in the axial direction and high bending strength in the vertical direction, making them suitable for various applications, such as stadiums, exhibition halls, theaters, grand halls, airports, and railway stations. When large-span steel trusses are used for exhibition hall interiors, the large floor loads necessitate high truss strength and stiffness requirements, typically employing fully welded connections to structural columns at the ends. When large-span steel trusses are rigidly connected to structural columns at the ends, the load-bearing capacity of the steel columns is crucial. Rigid connections transfer the truss's internal forces to the columns at both ends, causing them to bear significant bending moments and shear forces. This may necessitate increasing the column cross-sectional dimensions or using higher-strength materials. For example, in the large-span transfer trusses of the exhibition halls and main venue of the National Convention Center Phase II project, trusses are rigidly connected to steel columns in both the longitudinal and transverse directions. The largest cross-section box-shaped composite steel columns reach 2.5 m × 1.5 m, with bidirectional longitudinal diaphragms and cross-shaped stiffening plates inside to ensure dense internal concrete pouring. To ensure structural integrity, concrete was poured between the truss columns. If a large-span truss requires additional open space, the load-bearing capacity will increase significantly. Solving this problem necessitates researching new structural load-bearing systems that meet the design requirements.

[0004] The rigid connection between the truss end and the structural column is difficult to construct and has high requirements for construction technology. Welding quality must be ensured during the welding process to avoid welding defects, which requires a high level of technical skills from the construction personnel.

[0005] Steel has a high coefficient of linear expansion, resulting in significant thermal expansion and contraction during temperature changes. The rigid connection between the ends of a steel truss and the columns restricts its deformation, leading to substantial thermal stresses. These stresses can cause cracks or deformation in the structure, affecting its durability.

[0006] Furthermore, rigid connections at both ends of the steel truss result in relatively poor seismic performance. Under seismic loading, the connection nodes between the rigid steel truss ends and the columns are prone to significant internal forces and deformations. If the node design is flawed or the construction quality is poor, it may lead to node failure, thus affecting the structure's seismic performance.

[0007] Due to the numerous drawbacks mentioned above, the design of end node connections in large-span steel structures is particularly important. During use, trusses may be damaged due to improperly designed loads and connection nodes. Therefore, it is necessary to conduct stress analysis based on the specific application scenario and design the connection nodes and truss structural stress system accordingly. Utility Model Content

[0008] To address the aforementioned problems, this utility model provides a large-span steel truss supporting space frame system.

[0009] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This utility model discloses a large-span steel truss supporting space frame system, including steel columns, corbels, fixed hinge supports, support short columns, trusses, floor slabs, support columns, and space frame. The truss is a single-layer truss. The two ends of the upper chord of the truss are fixedly connected to the support short columns, and the support short columns are fixedly connected to the fixed hinge supports. The fixed hinge supports are fixedly connected to the steel columns through corbels. The truss has support columns on its upper chord. The bottom of the support columns is welded to the upper chord of the truss, and the top is hinged to the space frame. The floor slab is laid on the upper chord of the truss.

[0010] This utility model discloses a large-span steel truss supporting space frame system. Further, the corbel includes an upper flange plate, a lower flange plate, and multiple corbel web plates fixedly connected between the upper and lower flange plates. The upper flange plate extends directly into the steel column, causing the steel column to be divided into two parts and welded to the upper flange plate. The lower flange plate is directly fixedly connected to the steel column.

[0011] This utility model discloses a large-span steel truss upper support space frame system. Furthermore, a corbel stiffening plate is provided between the corbel web plates, and the corbel web plates and corbel stiffening plates are respectively welded to the upper flange plate and the lower flange plate of the corbel.

[0012] This utility model discloses a large-span steel truss supporting space frame system. Further, the support short column includes a box-shaped short column flange plate and a cross-shaped short column web plate. The short column flange plate is divided into two parts by the short column web plate on the perpendicular side of the truss.

[0013] This utility model discloses a large-span steel truss supporting space frame system. Further, the truss includes chords and straight and diagonal web members connected between the chords, and the chords and diagonal web members are fixedly connected to the support short columns.

[0014] This utility model discloses a large-span steel truss supporting space frame system. Furthermore, the diagonal web members and the fixed hinge supports cannot collide, the fixed hinge supports cannot collide with the steel column walls, and the fixed hinge supports have a certain rotational capacity.

[0015] This utility model discloses a large-span steel truss supporting space frame system. Further, the truss is divided into a transverse truss and a longitudinal truss that intersects with the transverse truss. Dampers are respectively installed at the four corners of the intersection of the upper chord of the transverse truss and the longitudinal truss, and the dampers are respectively connected to the transverse truss and the longitudinal truss.

[0016] This utility model discloses a large-span steel truss supporting space frame system. Furthermore, the floor slab includes a steel truss floor slab and a concrete layer poured on the steel truss floor slab.

[0017] Compared with the prior art, this utility model has the following advantages: 1. A large-span steel truss supports a roof space frame structure. This type of large-span steel truss with indoor usable area requirements uses fixed hinged supports at the ends to release structural stiffness and reduce the thrust on both sides of the structure. This effectively reduces the stress on the end steel columns and reduces the cross-section of the steel columns. In addition, the hinged joints of the supports allow the steel truss to rotate slightly under load, which can effectively distribute the load transferred to the supports and avoid local stress concentration in the members. 2. The design of the end hinged supports simplifies structural installation and makes on-site construction and welding quality control relatively easy. Furthermore, the flexibility of the hinged support nodes facilitates adjustments to the truss position and orientation during installation, improving construction efficiency and significantly shortening the construction period. 3. The large-span spatial grid structure is built on the support hinged truss system, realizing the use of large-span space on both the upper and lower floors of the truss by relying on a single large-span truss. The structural system is novel. 4. By setting the upper flange plate of the bracket through the steel column, the continuity of the bracket's tensile force is ensured, which solves the problem of the bracket's fixed hinge support, where the pressure is relatively large and the main force is concentrated, which will generate a large tensile force on the upper flange plate of the bracket and pose a high risk.

[0018] The present invention will be further described below with reference to the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the connection between the truss and the fixed hinge support of this utility model; Figure 3 This is a schematic diagram of the short column of the support of this utility model; Figure 4 This is a schematic diagram of the connection between the bracket and the steel column in this utility model; Figure 5 This is a plan view of the damper of this utility model.

[0020] Figure label: 1. Steel column; 11. Force transfer plate; 2. Corbel; 21. Upper flange plate of corbel; 22. Web plate of corbel; 23. Stiffening plate of corbel; 24. Lower flange plate of corbel; 3. Fixed hinge support; 4. Support short column; 41. Flange plate of short column; 42. Web plate of short column; 5. Truss; 51. Diagonal web member; 52. Chord member; 6. Floor slab; 7. Damper; 8. Support column; 9. Space frame. Detailed Implementation

[0021] like Figures 1-5 As shown, this utility model discloses a large-span steel truss supporting space frame system, including steel columns 1, corbels 2, fixed hinge supports 3, support short columns 4, trusses 5, floor slabs 6, support columns 8, and space frame 9. The truss 5 is a single-layer truss with multiple sections. The two ends of the upper chord of the truss 5 are anchored to the sides of the support short columns 4. The support short columns 4 are welded to the fixed hinge supports 3, and the fixed hinge supports 3 are welded to the steel columns 1 through the corbels 2.

[0022] A support column 8 is provided on the upper chord of truss 5 at the position corresponding to its straight web member. The bottom of the support column 8 is welded to the upper chord of truss 5, and the top is hinged to the space frame 9. The floor slab 6 is laid on the upper chord of truss 5. In this application, truss 5 is divided into transverse trusses and longitudinal trusses that intersect with the transverse trusses. Considering the comfort of the floor slab, dampers 7 are respectively provided at the four corners of the intersection of the upper chords of the transverse trusses and the longitudinal trusses. The dampers 7 are respectively connected to the upper chords of the transverse trusses and the longitudinal trusses.

[0023] like Figure 2 As shown, the truss 5 includes chord members 52 and straight web members and diagonal web members 51 connected between the chord members 52. The chord members 52 and diagonal web members 51 are fixedly connected to the support short column 4, and the diagonal web members 51 cannot collide with the fixed hinge support 3. The fixed hinge support 3 is welded to the corbel 2, and the corbel 2 is welded to the steel column 1, and the fixed hinge support 3 cannot collide with the column wall of the steel column 1.

[0024] The corbel 2 includes an upper flange plate 21, a lower flange plate 24, and multiple corbel web plates 22 fixedly connected between the upper flange plate 21 and the lower flange plate 24. Corbel stiffening plates 23 are provided between the corbel web plates 22. The corbel web plates 22 and the stiffening plates 23 are welded to the upper flange plate 21 and the lower flange plate 24, respectively. The upper flange plate 21 extends directly into the steel column 1, dividing the steel column 1 into two parts welded to the upper flange plate 21. The lower flange plate 24 is directly welded to the column wall of the steel column 1. The fixed hinge support 3 is welded to the upper flange plate 21.

[0025] The support short column 4 consists of a box-shaped short column flange plate 41 and a cross-shaped short column web plate 42. The short column flange plate 41 is divided in two by the short column web plate 42 on the side perpendicular to the truss 5, facilitating the welding of the short column web plate 42 and the short column flange plate 41. The chord member 52 and the diagonal web member 51 are welded to the short column flange plate 41, and the short column flange plate 41 is a flat surface on the connection side of the truss 5, facilitating the welding of the chord member 52 and the diagonal web member 51. The box-shaped flange plate and the cross-shaped web plate of the support short column 4 enable the internal forces of the truss 5 to be transferred to the support more completely, determine the force transmission path of the truss 5, and enable accurate internal force analysis and design of a support that meets the requirements.

[0026] Among them, the fixed hinge support 3 corresponds one-to-one with the support short column 4, and the projection of the support short column 4 in the vertical direction falls within the range of the fixed hinge support 3. The design dimensions of the fixed hinge support 3 cannot collide with the diagonal web member 51, nor with the column wall of the support short column 4. At the same time, the fixed hinge support 3 has a certain rotation capacity, which can release the bending moment at the end of the truss 5.

[0027] The floor slab 6 is composed of the steel truss floor slab 5 and the concrete layer poured on the steel truss floor slab 5.

[0028] A force transmission plate 11 is provided inside the steel column 1 at the connection point with the lower flange plate 24 of the corbel.

[0029] 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 large-span steel truss upper supporting space truss system, characterized in that, It includes steel columns (1), corbels (2), fixed hinge supports (3), support short columns (4), trusses (5), floor slabs (6), support columns (8), and space frames (9). The trusses (5) are single-layer trusses. The two ends of the upper chord (52) of the trusses (5) are fixedly connected to the support short columns (4). The support short columns (4) are fixedly connected to the fixed hinge supports (3). The fixed hinge supports (3) are fixedly connected to the steel columns (1) through corbels (2). The upper chord of the truss (5) is provided with a support column (8), the bottom of the support column (8) is welded to the upper chord of the truss (5), and the top is hinged to the space frame (9); the floor slab (6) is laid on the upper chord of the truss (5).

2. The large-span steel truss supporting space frame system according to claim 1, characterized in that, The cow leg (2) includes an upper flange plate (21), a lower flange plate (24), and multiple cow leg web plates (22) fixedly connected between the upper flange plate (21) and the lower flange plate (24). The upper flange plate (21) extends directly into the steel column (1), causing the steel column (1) to be divided into two parts and welded to the upper flange plate (21). The lower flange plate (24) is directly fixedly connected to the steel column (1).

3. The large-span steel truss supporting space frame system according to claim 2, characterized in that, A stiffening plate (23) is provided between the cow leg belly plates (22), and the cow leg belly plates (22) and the stiffening plate (23) are welded to the upper flange plate (21) and the lower flange plate (24) of the cow leg, respectively.

4. The large-span steel truss supporting space frame system according to claim 1, characterized in that, The support short column (4) includes a box-shaped short column flange plate (41) and a cross-shaped short column web plate (42). The short column flange plate (41) is divided into two parts by the short column web plate (42) on the side perpendicular to the truss (5).

5. A large-span steel truss supporting space frame system according to claim 1, characterized in that, The truss (5) includes chord members (52) and straight web members and diagonal web members (51) connected between the chord members (52). The chord members (52) and diagonal web members (51) are fixedly connected to the support short columns (4).

6. A large-span steel truss supporting space frame system according to claim 5, characterized in that, The inclined web member (51) cannot collide with the fixed hinge support (3), the fixed hinge support (3) cannot collide with the column wall of the steel column (1), and the fixed hinge support (3) has a certain rotation capability.

7. A large-span steel truss supporting space frame system according to claim 1, characterized in that, The truss (5) is divided into a transverse truss and a longitudinal truss that intersects with the transverse truss. Dampers (7) are installed at the four corners of the intersection of the upper chords of the transverse truss and the longitudinal truss. The dampers (7) are connected to the transverse truss and the longitudinal truss respectively.

8. A large-span steel truss supporting space frame system according to claim 1, characterized in that, The floor slab (6) includes a steel truss floor slab and a concrete layer poured on the steel truss floor slab.

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