Cable-strut joint for improving collapse resistance of spatial steel structure

Abstract

The application discloses a cable-strut joint for improving anti-collapse performance of a space steel structure, which comprises an outer pipe, a strut pipe inserted into the outer pipe and overlapped with the outer pipe, a roller connected with the end of the outer pipe, a cable passing through the roller, a clamp sleeved outside the outer pipe, a first annular push plate sleeved outside the outer pipe, a second annular push plate sleeved outside the strut pipe, and a spring arranged between the first annular push plate and the second annular push plate; the outer pipe is provided with outer pipe notches on both sides, the strut pipe is provided with strut pipe ear plates on both sides, and the clamp is provided with clamp ear plates on both sides; the strut pipe ear plates are inserted into the outer pipe notches, the overlapping of the outer pipe and the strut pipe is realized, the strut pipe ear plates and the clamp ear plates are connected through bolts, and the relative sliding direction of the strut pipe ear plates and the clamp ear plates is arranged along the axial direction of the outer pipe. The application can effectively control the increasing rate of the internal force of the cable, reduce the cable fracture probability, improve the energy consumption capacity of the structure, 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 cable-stayed joint for improving 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 load-bearing capacity of the cables and struts, resulting in serious accidents such as partial or even complete structural collapse.

[0003] Adding a buckling restraint member to the outside of the strut provides lateral support and limits buckling deformation when the strut becomes instable under compression, thus improving its stable load-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 the restraint member effectively prevents buckling of the strut under compression, it cannot prevent the continuous increase in internal forces in the cables due to increased external loads, which may lead to cable fracture exceeding the strength limit. Furthermore, when facing extreme natural disasters such as earthquakes and typhoons, spatial steel structures often experience large dynamic responses due to insufficient energy dissipation, increasing the risk of structural collapse. Therefore, further improving the structure's energy dissipation capacity by dissipating externally input energy and reducing the dynamic response of the structure and cables is also beneficial for improving the structure's resistance to collapse.

[0004] To address the problems existing in current space steel structures, this invention proposes a cable-stayed joint 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 cable-stayed node that improves the collapse resistance of spatial steel structures. This cable-stayed node can effectively control the rate of increase of internal forces in the cables and reduce the probability of cable breakage, while also improving the energy dissipation capacity of the structure, thereby enhancing the collapse resistance of the spatial steel structure.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a cable-stayed joint for improving the collapse resistance of a spatial steel structure, comprising an outer tube, a support tube, a roller, a cable, a first annular push plate, a second annular push plate, and a spring.

[0007] The support tube is inserted into the outer tube from one end, and the support tube overlaps with the outer tube; a roller is fixed at the other end of the outer tube, and a cable is wound around the roller.

[0008] The outer tube is fitted with a first annular push plate, and the support tube is fitted with a second annular push plate. The first annular push plate and the second annular push plate are connected by a spring.

[0009] More preferably, the outer tube is also fitted with a clamp, which is located below the first annular push plate; the clamp is formed by two semi-circular components, and clamp ear plates are respectively provided on the two components. The two clamp ear plates can be fixedly connected by bolts, thereby fixing the clamp to the outer tube.

[0010] More preferably, the side of the support tube is symmetrically provided with support tube ear plates, and the support tube ear plates are provided with vertical slots to accommodate the connecting bolts of the clamp ear plates.

[0011] More preferably, the outer tube has symmetrically arranged outer tube slots on its side, and the width of the outer tube slots is greater than the width of the support tube ear plate; the support tube ear plate is inserted into the outer tube slot to achieve the overlap between the outer tube and the support tube.

[0012] More preferably, the support tube ear plate is inserted into the groove of the outer tube to achieve the overlap between the outer tube and the support tube. The support tube ear plate and the clamp ear plate are connected by bolts, and the support tube ear plate and the clamp ear plate can slide relative to each other in the axial direction of the outer tube.

[0013] More preferably, the clamp is welded to the outer tube, the first annular push plate is welded to the outer tube, and the second annular push plate is welded to the support tube.

[0014] The present invention has the following beneficial effects: 1. This invention effectively controls the rate of increase in cable internal forces. Under extreme vertical loads, the mid-span deflection of a spatial steel structure increases, leading to a significant increase in the internal forces of the struts and cables. Once this exceeds the bearing capacity limit of the components, it may cause cable breakage or strut buckling instability, resulting in structural collapse. To avoid cable breakage or strut buckling instability, this invention introduces a parallel design of springs and friction dampers at the strut nodes. As the mid-span deflection of the spatial steel structure continues to increase, once the friction damper changes from static friction to sliding friction, the strut stiffness will instantly decrease to the spring stiffness, and the rate of increase in internal forces in the cables and struts will rapidly slow down. Selecting appropriate spring stiffness and the slippage force of the friction damper during the strut node design stage can effectively reduce the probability of cable and strut failure under extreme vertical loads, thereby improving the structure's resistance to collapse.

[0015] 2. This invention effectively improves the ductility of spatial steel structures. Since cable breakage and strut buckling instability under compression are both brittle failure modes, the ductility of spatial steel structures will significantly decrease once cable breakage or strut buckling instability occurs under extreme vertical loads, greatly increasing the probability of sudden collapse without obvious warning. This invention introduces a parallel design of springs and friction dampers at the strut nodes. After the friction dampers reach the preset slip force and enter the sliding friction stage, the subsequent increase in deflection deformation will be mainly absorbed by the elastic deformation of the springs. This reduces the deformation and internal force requirements of the cables and struts, while increasing the ductility of the spatial steel structure, thereby effectively improving its resistance to collapse.

[0016] 3. This invention enhances the energy dissipation capacity of spatial steel structures under dynamic loads. Because ordinary spatial steel structures lack significant energy dissipation capabilities in their components, they exhibit noticeable dynamic responses under extreme dynamic loads such as earthquakes and typhoons, leading to a risk of structural collapse. This invention, by introducing a parallel design of springs and friction dampers at the strut nodes, significantly improves the structure's energy dissipation capacity through friction 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. Attached Figure Description

[0017] Figure 1 This is a front view of the device of the present invention; Figure 2 for Figure 1 AA cross-section view; Figure 3 This is a side view of the device of the present invention; Figure 4 for Figure 3 Longitudinal sectional view; Figure 5 This is a front view of the outer tube; Figure 6 This is a side view of the support tube; Figure 7 This is a front view of the clamp; Figure 8 This is a top view of the clamp; Figure 9 This is a schematic diagram of the force state of the present invention.

[0018] Among them: 1. outer tube; 11. outer tube groove; 2. support tube; 21. support tube ear plate; 3. roller; 4. cable; 5. clamp; 51. clamp ear plate; 6. first annular push plate; 7. second annular push plate; 8. spring. Implementation

[0019] 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.

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific preferred embodiments.

[0021] like Figures 1-4 As shown, a cable-stayed joint for improving the collapse resistance of a spatial steel structure includes an outer tube 1, a support tube 2 inserted into and overlapping the outer tube 1, a roller 3 connected to the end of the outer tube 1, a cable 4 passing through the roller 3, a clamp 5 fitted on the outside of the outer tube 1, a first annular push plate 6 fitted on the outside of the outer tube 1, a second annular push plate 7 fitted on the outside of the support tube 2, and a spring 8 disposed between the first annular push plate 6 and the second annular push plate 7.

[0022] The support tube 2 is inserted into the outer tube 1 from one end, and the support tube 2 overlaps with the outer tube 1; a roller 3 is fixed to the other end of the outer tube 1, and a cable 4 is wound around the roller 3. The outer tube 1 is fitted with a first annular push plate 6, and the support tube 2 is fitted with a second annular push plate 7. The first annular push plate 6 is welded to the outer tube 1, and the second annular push plate 7 is welded to the support tube 2. The first annular push plate 6 and the second annular push plate 7 are connected by a spring 8.

[0023] The outer tube 1 is also fitted with a clamp 5, which is welded to the outer tube 1 and is located below the first annular push plate 6.

[0024] like Figure 7 and Figure 8 As shown, the clamp 5 is formed by two semi-circular components. Each component is provided with a clamp ear plate 51. The two clamp ear plates 51 can be fixedly connected by bolts, thereby fixing the clamp 5 to the outer tube 1.

[0025] like Figure 6 As shown, support tube ear plates 21 are symmetrically arranged on the side of the support tube 2. Vertical slots are opened on the support tube ear plates 21 to accommodate the connecting bolts of the clamp ear plates 51.

[0026] like Figure 5 As shown, the outer tube 1 has symmetrically arranged outer tube slots 11 on its side, and the width of the outer tube slots 11 is greater than the width of the tube support ear plate 21.

[0027] The support tube ear plate 21 is inserted into the outer tube groove 11 to achieve the overlap between the outer tube 1 and the support tube 2. The support tube ear plate 21 and the clamp ear plate 51 are connected by bolts, and the support tube ear plate 21 and the clamp ear plate 51 can slide relative to each other in the axial direction of the outer tube 1.

[0028] The working principle of this invention is as follows: Figure 9 As shown: The superstructure transmits vertical axial pressure to the cable support node through the support tube 2, and causes tension in the cable 4. When the axial pressure in the support tube 2 is less than the frictional slippage force between the support tube ear plate 21 and the clamp ear plate 51, there will be no significant relative movement between the outer tube 1 and the support tube 2, and the spring 8 will not undergo compression deformation. At this time, the axial pressure transmitted by the superstructure will be transmitted to the cable 4 through the cable support node with the axial stiffness of the support tube 2.

[0029] When the axial pressure in the support tube 2 exceeds the frictional slippage force between the support tube ear plate 21 and the clamp ear plate 51, the support tube 2 begins to move downward relative to the outer tube 1. The support tube 2 will cause the support tube ear plate 21 and the clamp ear plate 51 to slide relative to each other, and friction will be generated on the sliding surfaces of the support tube ear plate 21 and the clamp ear plate 51 to consume energy. At the same time, the support tube 2 will cause the second annular push plate 7 to move downward. The distance between the second annular push plate 7 and the first annular push plate 6 gradually decreases, causing the spring 8 to undergo compression deformation, providing load-bearing capacity and second stiffness for the cable support node. At this time, the axial pressure transmitted by the upper structure will be transmitted to the cable 4 through the elastic stiffness of the spring 8 after passing through the cable support node.

[0030] 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 cable-stayed joint for improving the collapse resistance of spatial steel structures, characterized in that: Includes outer tube (1) and support tube (2). Roller (3), cable (4), first annular push plate (6), second annular push plate (7), spring (8); The support tube (2) is inserted into the outer tube (1) from one end of the outer tube (1), and the support tube (2) overlaps with the outer tube (1); a roller (3) is fixed at the other end of the outer tube (1), and a cable (4) is wound around the roller (3). The outer tube (1) is fitted with a first annular push plate (6), and the support tube (2) is fitted with a second annular push plate (7). The plate (6) and the second annular push plate (7) are connected by a spring (8); The outer tube (1) has symmetrically arranged outer tube slots (11) on its side. The outer tube (1) is also fitted with a clamp (5), which is located below the first annular push plate (6). The clamp (5) is formed by two semi-circular components, and clamp ear plates (51) are respectively provided on the two semi-circular components. The two clamp ear plates (51) can be fixedly connected by bolts, thereby fixing the clamp (5) on the outer tube (1). The side of the support tube (2) is symmetrically provided with support tube ear plates (21), and vertical slots are provided on the support tube ear plates (21) to accommodate the connecting bolts of the clamp ear plates (51) through which they pass. The support tube ear plate (21) is inserted into the outer tube groove (11) to achieve the overlap between the outer tube (1) and the support tube (2); The tube support ear plate (21) and the clamp ear plate (51) are connected by bolts, and the tube support ear plate (21) and the clamp ear plate (51) can slide relative to each other along the axial direction of the outer tube (1); The superstructure transmits vertical axial pressure to the cable support nodes through the support tubes, and causes the cables to generate tension. When the axial pressure in the support tube is less than the frictional slippage force between the support tube lugs and the clamp lugs, there is no relative movement between the outer tube and the support tube, and the spring does not undergo compression deformation. At this time, the axial pressure transmitted by the superstructure will be transmitted to the cables through the axial stiffness of the support tube after passing through the cable support nodes. When the axial pressure in the strut exceeds the frictional slippage force between the strut ear plate and the clamp ear plate, the strut begins to move downward relative to the outer tube. The strut will cause the strut ear plate and the clamp ear plate to slide relative to each other, and friction will be generated on the sliding surface of the strut ear plate and the clamp ear plate to consume energy. At the same time, the strut will cause the second annular push plate to move downward. The distance between the second annular push plate and the first annular push plate gradually decreases, causing the spring to compress and deform, providing load-bearing capacity and second stiffness for the cable support node. At this time, the axial pressure transmitted by the upper structure will be transmitted to the cable through the elastic stiffness of the spring after passing through the cable support node.

2. The cable-stayed joint for improving the collapse resistance of spatial steel structures according to claim 1, characterized in that: The width of the outer tube groove (11) is greater than the width of the tube support ear plate (21).

3. The cable-stayed joint for improving the collapse resistance of spatial steel structures according to claim 1, characterized in that: The clamp (5) is welded to the outer tube (1), the first annular push plate (6) is welded to the outer tube (1), and the second annular push plate (7) is welded to the support tube (2).

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