Compression strut for improving the collapse resistance of a spatial steel structure

Abstract

The application discloses a compression rod for improving the anti-collapse performance of a space steel structure, which comprises an inner tube, an upper outer half tube and a lower outer half tube fixedly sleeved outside the inner tube, an upper half clamp fixedly sleeved outside the upper outer half tube, a lower half clamp fixedly sleeved outside the lower outer half tube, a first annular push plate and a second annular push plate fixedly sleeved outside the upper outer half tube and the lower outer half tube, and a spring arranged between the first annular push plate and the second annular push plate, wherein the upper half clamp is provided with upper half clamp ear plates on both sides, the lower half clamp is provided with lower half clamp ear plates on both sides, the upper half clamp ear plates are connected with the lower half clamp ear plates through bolts, and the relative sliding direction is arranged in the axial direction of the inner tube. The compression rod can effectively improve the compression load bearing capacity of a rod piece, control the residual deformation of the rod piece, improve the energy consumption capacity of the rod piece, and achieve the purpose of enhancing the anti-collapse performance of the space steel structure.

Description

Technical Field

[0001] This invention relates to the field of civil engineering technology, specifically to a compression member that improves the collapse resistance of spatial steel structures. Background Technology

[0002] Spatial steel structures possess advantages such as lightweight and elegant design, rational stress distribution, large span, and economic efficiency, making them widely used in important public buildings with large or even super-large spaces, such as stadiums, airports, and convention centers. However, spatial steel structures have low redundancy. Incomplete consideration of structural load conditions during the design phase, component quality defects during fabrication, and excessive loads during use can all lead to insufficient structural compression member bearing capacity, resulting in serious accidents such as partial or even complete structural collapse.

[0003] Adding a buckling restraint layer to the outside of the compression member provides lateral support and limits buckling deformation when the original member buckles under compression, thus improving the member's stable bearing capacity. In recent years, the application of buckling restraint technology to some key members in spatial steel structures has been considered an important means of structural reinforcement. While restraint members can effectively prevent buckling under compression, they cannot solve the problem of a sharp drop in member stiffness and insufficient bearing capacity caused by material yielding. Furthermore, residual deformation occurs after yielding, which can lead to large internal forces in statically indeterminate structures, severely impacting the structure's bearing capacity and collapse resistance. In the face of extreme natural disasters such as earthquakes and typhoons, structures often experience increased risk of collapse due to large dynamic responses. Therefore, while improving the bearing capacity of key members, further enhancing energy dissipation capacity—by dissipating externally input energy and reducing the dynamic response of the structure and its members—is also beneficial for improving the structure's collapse resistance.

[0004] To address the problems existing in the reinforcement of members in existing space steel structures, this invention proposes a compression member to improve the collapse resistance of space steel structures. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a compression member that improves the collapse resistance of a space steel structure. This member can effectively improve the compressive bearing capacity of the member while also controlling residual deformation and improving energy dissipation capacity, thereby enhancing the collapse resistance of the space steel structure.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] A compression member for improving the collapse resistance of a spatial steel structure includes an inner tube, an upper outer half tube, a lower outer half tube, an upper clamp, a lower clamp, a first annular push plate, a second annular push plate, and a spring.

[0008] The upper outer half-pipe and the lower outer half-pipe are fitted together on the inner pipe, and the upper outer half-pipe and the lower outer half-pipe are fixedly connected to the inner pipe respectively.

[0009] A semi-circular upper clamp is fixedly fitted on the upper outer half pipe, and a semi-circular lower clamp is fixedly fitted on the lower outer half pipe. The upper and lower clamps are connected by bolts.

[0010] The outer surfaces of the upper and lower outer tubes are also fitted with a first and a second circular push plate. The first circular push plate is fixedly connected to the lower outer tube, and the second circular push plate is fixedly connected to the upper outer tube. The first and second circular push plates are connected by a spring.

[0011] More preferably, one side of the second annular pusher plate is welded to the upper outer half-pipe, and the other side is welded to the inner pipe; one side of the first annular pusher plate is welded to the lower outer half-pipe, and the other side is welded to the inner pipe.

[0012] More preferably, in the initial state where there is no force, the upper outer half-tube and the lower outer half-tube are of equal length and their ends are aligned.

[0013] More preferably, the upper clamp and the lower clamp are located at the same position along the length of the inner tube, the upper clamp is welded to the upper outer half of the tube, and the lower clamp is welded to the lower outer half of the tube.

[0014] More preferably, the upper clamp has symmetrical upper clamp ear plates on both sides, and the lower clamp has lower clamp ear plates on both sides, with the upper clamp ear plates and the lower clamp ear plates connected by bolts.

[0015] More preferably, the upper clamp ear plate is provided with bolt holes, and the lower clamp ear plate is provided with slots for bolts to pass through and slide. The upper clamp ear plate and the lower clamp ear plate are connected by bolts, and the upper clamp ear plate and the lower clamp ear plate can slide relative to each other along the axial direction of the inner tube.

[0016] More preferably, after the spring is preloaded, one end rests against the first annular push plate and the other end rests against the second annular push plate.

[0017] The present invention has the following beneficial effects:

[0018] 1. This invention effectively improves the secondary stiffness of key compression members in space steel structures. Under axial pressure, ordinary steel compression members are prone to buckling instability, leading to negative stiffness and loss of load-bearing capacity. Even with traditional sleeve-constraint reinforcement technology, ideally, the compression member can only achieve full-section compressive yielding, after which the stiffness approaches zero, causing the structure to gradually collapse as its load-bearing capacity no longer increases and deformation continues to grow. This invention introduces sleeve-constraint technology combined with preloaded springs. Even after the member yields across its entire cross-section, the springs on the constraint sleeves still provide secondary stiffness to the compression member, thereby effectively improving the collapse resistance of space steel structures.

[0019] 2. This invention significantly improves the load-bearing capacity of key compression members in spatial steel structures. Compression members in spatial steel structures are highly susceptible to buckling instability once their design load-bearing capacity is exceeded, resulting in low load-bearing capacity redundancy. The sleeve constraint technology employed in this invention effectively limits lateral instability of the compression members, increases the stress level of the compression member cross-section, and, through an innovative construction, establishes a parallel relationship between the frictional force between the clamp lugs and the spring preload with the axial force of the compression member, effectively sharing some of the axial pressure. This improves the load-bearing capacity redundancy of the structure and significantly enhances the collapse resistance of spatial steel structures under extreme loads.

[0020] 3. This invention enhances the energy dissipation capacity of spatial steel structures under dynamic loads. Because ordinary steel compression members lack significant energy dissipation capacity, spatial steel structures exhibit significant dynamic responses under extreme dynamic loads such as earthquakes and typhoons, leading to a risk of structural collapse. This invention cleverly combines sleeve constraints and clamp lug friction, significantly improving the energy dissipation capacity of key compression members through metal yielding and frictional damping. This effectively absorbs externally input energy, reduces the structure's dynamic response, and improves the collapse resistance of spatial steel structures under dynamic loads.

[0021] 4. This invention effectively reduces the residual deformation of spatial steel structures. Ordinary steel compression members inevitably experience residual deformation upon unloading once they enter the nonlinear material stage. Since spatial steel structures are typically statically indeterminate systems, the residual deformation of the members can cause significant internal forces, reducing the structure's ability to withstand external loads. However, this invention introduces pre-compression spring technology. The pre-compression springs form a self-balancing system with the plastically deformed compression members, effectively overcoming the residual deformation of the members and preventing an increase in internal forces. This, in turn, improves the sustained load-bearing capacity of the spatial steel structure after earthquakes or accidental loads. Attached Figure Description

[0022] Figure 1 This is a front view of the device of the present invention;

[0023] Figure 2 This is a top view of the device of the present invention;

[0024] Figure 3 for Figure 1 AA cross-section view;

[0025] Figure 4 This is a front view of the upper half of the clamp;

[0026] Figure 5 This is a top view of the upper half of the clamp;

[0027] Figure 6 This is a front view of the lower half of the clamp;

[0028] Figure 7 This is a top view of the lower half of the clamp;

[0029] Figure 8 This is a schematic diagram of the pressure state of the present invention.

[0030] The components include: 1. Inner tube; 2. Upper outer half tube; 3. Lower outer half tube; 4. Upper clamp; 41. Upper clamp ear plate; 5. Lower clamp; 51. Lower clamp ear plate; 6. First annular push plate; 7. Second annular push plate; 8. Spring. Implementation

[0031] In the description of this invention, it should be understood that the terms "left side," "right side," "upper part," "lower part," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and 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. "First," "second," etc., do not indicate the importance of the components, and therefore should not be construed as a limitation of this invention. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the scope of protection of this invention.

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and specific preferred embodiments.

[0033] like Figures 1-3 As shown, a compression member for improving the collapse resistance of a spatial steel structure according to the present invention includes an inner tube 1, an upper outer half tube 2 and a lower outer half tube 3 sleeved on the outer periphery of the inner tube 1, an upper clamp 4 sleeved on the outer periphery of the upper outer half tube 2, a lower clamp 5 sleeved on the outer periphery of the lower outer half tube 3, a first annular push plate 6 and a second annular push plate 7 sleeved on the outer sides of the upper outer half tube 2 and the lower outer half tube 3, and a spring 8 disposed between the first annular push plate 6 and the second annular push plate 7.

[0034] The upper outer half-pipe 2 and the lower outer half-pipe 3 are fitted together on the inner pipe 1, and the upper outer half-pipe 2 and the lower outer half-pipe 3 are respectively fixedly connected to the inner pipe 1; a semi-circular upper half-clamp 4 is fixedly fitted on the upper outer half-pipe 2, and a semi-circular lower half-clamp 5 is fixedly fitted on the lower outer half-pipe 3, and the upper half-clamp 4 and the lower half-clamp 5 are connected by bolts.

[0035] The outer surfaces of the upper outer half-tube 2 and the lower outer half-tube 3 are also fitted with a first annular push plate 6 and a second annular push plate 7. The first annular push plate 6 is fixedly connected to the lower outer half-tube 3, and the second annular push plate 7 is fixedly connected to the upper outer half-tube 2. The first annular push plate 6 and the second annular push plate 7 are connected by a spring 8.

[0036] One side of the second annular pusher plate 7 is welded to the upper outer half-pipe 2, and the other side is welded to the inner pipe 1; one side of the first annular pusher plate 6 is welded to the lower outer half-pipe 3, and the other side is welded to the inner pipe 1.

[0037] The upper clamp 4 and the lower clamp 5 are located at the same position along the length of the inner tube 1. The upper clamp 4 is welded to the upper outer tube 2, and the lower clamp 5 is welded to the lower outer tube 3.

[0038] like Figures 3-7 As shown, the upper clamp 4 has symmetrical upper clamp ear plates 41 on both sides, and the lower clamp 5 has lower clamp ear plates 51 on both sides. The upper clamp ear plate 41 has bolt holes, and the lower clamp ear plate 51 has slots for bolts to pass through and slide. The upper clamp ear plate 41 and the lower clamp ear plate 51 are connected by bolts, and the upper clamp ear plate 41 and the lower clamp ear plate 51 can slide relative to each other along the axial direction of the inner tube 1.

[0039] In the initial state where no force is applied, the upper outer tube 2 and the lower outer tube 3 are of equal length and aligned at both ends. After the spring 8 is preloaded, one end rests on the first annular push plate 6 and the other end rests on the second annular push plate 7.

[0040] The working principle of this invention is as follows: Figure 8As shown, when the compression rod is not under external load, the inner tube 1 and the spring 8 form a self-balancing system, and the preload in the spring 8 causes the inner tube 1 to bear a certain tensile force. When the compression rod bears a compressive external load, the upper outer tube 2 and the lower outer tube 3 are connected by clamps, the first annular push plate 6 and the second annular push plate 7 to form a whole, which provides constraint on the lateral deformation of the inner tube 1 and prevents the inner tube 1 from buckling under compression. At the same time, the upper outer tube 2 moves to the left under the drive of the right end of the inner tube 1, and the lower outer tube 3 moves to the right under the drive of the left end of the inner tube 1. This movement will cause the upper clamp 4 and the lower clamp 5 to move relative to each other along the axial direction of the inner tube 1, and friction will be generated on the sliding surface of the upper clamp ear plate 41 and the lower clamp ear plate 51 to consume energy; the first annular push plate 6 and the second annular push plate 7 will move closer to each other, and drive the spring 8 to undergo compression deformation, providing the compression rod with load-bearing capacity and second stiffness.

[0041] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all fall within the protection scope of the present invention.

Claims

1. A compression member for improving the collapse resistance of spatial steel structures, characterized in that: Includes inner tube (1), upper outer half tube (2), lower outer half tube (3), upper half clamp (4), lower half clamp (5), first annular push plate (6), second annular push plate (7), and spring (8); The upper outer half-pipe (2) and the lower outer half-pipe (3) are fitted around the inner pipe (1), and the upper outer half-pipe (2) and the lower outer half-pipe (3) are respectively fixedly connected to the inner pipe (1); The upper clamp (4) is semi-circular and fixedly sleeved on the upper outer half pipe (2), and the lower clamp (5) is semi-circular and fixedly sleeved on the lower outer half pipe (3). The upper clamp (4) has symmetrical upper clamp ear plates (41) on both sides, and the lower clamp (5) has lower clamp ear plates (51) on both sides. The upper clamp ear plate (41) has bolt holes, and the lower clamp ear plate (51) has slots for bolts to pass through and slide. The upper clamp ear plate (41) and the lower clamp ear plate (51) are connected by bolts, and the two can slide relative to each other along the axial direction of the inner pipe (1). The first annular push plate (6) and the second annular push plate (7) are circular and are fitted onto the outer circumferential surfaces of the upper outer half-pipe (2) and the lower outer half-pipe (3). One side of the second annular push plate (7) is welded to the upper outer half-pipe (2), and the upper outer half-pipe (2) is welded to the inner pipe (1) at the opposite side. One side of the first annular push plate (6) is welded to the lower outer half-pipe (3), and the lower outer half-pipe (3) is welded to the inner pipe (1) at the opposite side. After the spring (8) is preloaded, one end of the spring (8) abuts against the side of the first annular push plate (6) facing the second annular push plate (7), and the other end abuts against the side of the second annular push plate (7) facing the first annular push plate (6). When the inner tube (1) is subjected to axial pressure, the upper outer half tube (2) and the lower outer half tube (3) are synchronously axially compressed and move towards each other along with the inner tube (1). This movement causes the first annular push plate (6) and the second annular push plate (7) to move closer to each other and compress the spring (8). At the same time, it causes the upper clamp ear plate (41) and the lower clamp ear plate (51) to slide relative to each other along the axial direction of the inner tube (1).

2. The compression member for improving the collapse resistance of space steel structures according to claim 1, characterized in that: In the initial state without axial pressure, the upper outer half-pipe (2) and the lower outer half-pipe (3) are of equal length and their ends are aligned.

3. The compression member for improving the collapse resistance of a space steel structure according to claim 1, characterized in that: The upper clamp (4) and the lower clamp (5) are located at the same position along the length of the inner tube (1). The upper clamp (4) is welded to the upper outer tube (2), and the lower clamp (5) is welded to the lower outer tube (3).

4. The compression member for improving the collapse resistance of a space steel structure according to any one of claims 1 to 3, characterized in that: The spring (8) is a compression spring. The preload applied by the spring (8) causes the inner tube (1) to bear axial tension in the initial state without axial pressure. The spring (8) and the inner tube (1) form a self-balancing system.

5. The compression member for improving the collapse resistance of a space steel structure according to claim 1, characterized in that: The upper outer half-pipe (2), the lower outer half-pipe (3), and the inner pipe (1) are all fully welded together. The first annular push plate (6) and the lower outer half-pipe (3), and the second annular push plate (7) and the upper outer half-pipe (2) are all fully welded together.

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