Space truss string structure with anti-isolation and anti-collapse synergistic function

Abstract

The application discloses a spatial beam string truss structure with anti-separation and anti-collapse synergic functions, comprising a plurality of plane beam string trusses and a plurality of supporting columns. The plane beam string truss comprises an upper chord truss, an abdominal support rod, an abdominal cross cable, a lower chord segmented cable, a cable node and an upper chord controllable fracture node. The abdominal cross cable comprises an upper cross cable and a lower cross cable. The upper chord controllable fracture node comprises a welded hollow ball, a connecting box, an insertion block, a shearing pin, a pin shaft, a directional joint and an upper chord each direction chord rod. When a lower pull cable is locally failed, a redundant force transmission path formed by the cross cable and the segmented cable forms the first defense line of the anti-collapse. When a large-scale initial failure or a plurality of important supporting members are simultaneously failed, the controllable fracture node is triggered to prevent the continuous collapse of adjacent areas, realize the isolation of the collapse area and form the second defense line of the anti-collapse. The application has simple structure, is easy to realize and is suitable for application in actual engineering.

Description

Technical Field

[0001] This invention relates to the field of architectural design and construction, specifically to the design of a large-span tensioned beam structure. Background Technology

[0002] In recent years, with the booming development of the construction industry, various large-scale public buildings and stadiums have emerged, leading to a growing demand for long-span spatial structures. Long-span tensioned beam structures are widely used due to their excellent mechanical properties, but existing technologies have many shortcomings. Traditional long-span tensioned beam structures have low redundancy and lack effective backup force transmission paths in the event of unforeseen circumstances. Once a problem occurs in a critical component, it can easily trigger a continuous collapse of the entire structure.

[0003] While some progress has been made in improving the progressive collapse resistance of traditional tensioned beam structures, shortcomings remain. Researchers have proposed various structural forms such as double-cable tensioned beams, cross-strut tensioned beams, and multi-cable tensioned trusses, with the main improvement goal being to increase the redundancy of the lower chord cables. For example, in a double-cable tensioned beam, if one cable fails, the other can share the load; in a cross-strut tensioned beam, the cross struts can provide a backup force transmission path in the event of failure of any section of the lower chord. However, when faced with large-scale initial failures or the simultaneous failure of multiple important supporting components, these structures still struggle to prevent overall collapse. Furthermore, there is currently a lack of effective collapse isolation mechanisms to prevent progressive collapse in adjacent areas. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a spatial tensioned truss structure that can achieve the dual functions of resisting progressive collapse and isolating the collapse area, thereby improving the progressive collapse resistance of large-span spatial structures and meeting the higher requirements for structural safety in actual engineering.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A spatial tensioned truss structure with anti-collapse synergistic function includes multiple planar tensioned trusses and multiple support columns supporting the multiple planar tensioned trusses; each planar tensioned truss includes an upper chord truss, web struts, web cross cables, lower chord segmented cables, cable nodes, and a controllable fracture node for the upper chord; the web cross cables are connected between two adjacent web struts; each segmented lower chord cable is connected to an adjacent cable node, and the anchorage ends of the side span segmented cables are anchored at the upper chord truss supports; controllable fracture nodes are provided on N sections of at least one of the planar tensioned trusses. The number of controllable fracture nodes on each cross-section is consistent with the number of chord members in the upper chord truss. The controllable fracture nodes on the upper chord on N cross-sections divide the upper chord truss into N+1 connection segments, where N≥1. Each controllable fracture node includes an inner member, a connector, and an outer member. The connector includes a connecting box, a plug, a shear pin, a pin shaft, and a directional joint. The inner member is fixed to the connecting box. One end of the plug is connected to the connecting box via a shear pin, and the other end of the plug is connected to the inner member via the directional joint.

[0006] The connecting box is provided with a pin hole and a plug hole, and the plug is also provided with a pin hole; the plug is inserted into the plug hole of the connecting box, and the plug is detachably connected to the connecting box by a shear pin inserted into the pin hole.

[0007] The connecting box includes a sphere and a box body, with the box body welded to the sphere; the inner rod is fixed to the sphere.

[0008] The directional joint includes a sleeve, a directional joint bearing, and a directional joint pin; the outer ring of the directional joint bearing is fixed inside the sleeve, and the directional joint pin is fixed to the inner ring of the directional joint bearing after being connected to the connecting block.

[0009] The abdominal cross cable includes two upper cross cables and two lower cross cables, arranged in an X-shaped cross, with the upper and lower cross cables connected by ear plate type nodes.

[0010] The cable node is located at the lower end of the abdominal strut, and the lower ends of the abdominal cross cable, the lower ends of the adjacent vertical strut, and the adjacent lower chord segment cable are hinged to the cable node.

[0011] The upper end of the abdominal strut is provided with a connecting lug plate, and the upper end of the abdominal cross cable is hinged to the upper end of the adjacent vertical strut on the upper chord truss through the connecting lug plate.

[0012] Compared with the prior art, the beneficial effects of the present invention are: The cross cables on the belly and the segmented cables on the lower chord together form a redundant force transmission path, which can quickly redistribute the load when a local cable fails, effectively limiting the spread of local damage and achieving the function of resisting progressive collapse. Controllable fracture nodes are set at key sections of the upper chord truss. When the structure encounters large-scale initial failure or multiple important supporting components fail at the same time, the node is triggered to disconnect according to preset conditions, which limits the collapse range to a local area, prevents continuous collapse and spread, and achieves the effect of "regional isolation". The directional joint is located at the outer connection end of the controllable fracture node, which can release the end moment when the node is under stress, thereby ensuring that the shear pin is smoothly sheared under the set load and promoting the smooth separation of the node in the expected manner.

[0013] As the core component for node disconnection, the shear pin is specially designed in terms of material and cross-section, with a clear fracture threshold. It can precisely break when the predetermined shear force is reached, ensuring the controllability and reliability of the collapse isolation action.

[0014] This invention is simple in structure and easy to implement, with strong practicality. In practical engineering applications, it requires no complex special processes, is easy to manufacture, install, and maintain, and is suitable for widespread application in large public buildings, stadiums, and other large-span spatial structures. Attached Figure Description

[0015] Figure 1 It is a spatial diagram of a tensioned truss structure; Figure 2 yes Figure 1 Enlarged schematic diagram of part A; Figure 3 It is a planar tensioned beam structure with cross cables on the abdomen, segmented cables on the lower chord, and controllable fracture nodes; Figure 4 It is a diagram of controllable fracture nodes; Figure 5 Exploded node diagram; Figure 6 It is a diagram of a directional joint structure; In the diagram: 1. Support column; 2. Controllable fracture node; 3. Planar tensioned truss; 21. Welded hollow sphere; 22. Connector; 23. Outer member; 24. Inner member; 221. Shear pin; 222. Connecting box; 223. Insert block; 225. Directional joint; 2251. Sleeve; 2252. Directional joint bearing; 2253. Directional joint pin; 31. Abdominal strut; 32. Ear plate node; 33. Lower chord segmented cable; 34. Upper chord truss; 35. Abdominal cross cable; 36. Cable node. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings, such as... Figure 1As shown, this invention provides a spatial tensioned truss structure with anti-collapse synergistic function, including multiple supporting columns 1 and multiple planar tensioned trusses 3. The planar tensioned truss includes an upper chord truss 34, a web strut 31, a web cross cable 35, a lower chord segmented cable 33, cable nodes 36, and upper chord controllable fracture nodes 2. Upper chord controllable fracture nodes 2 are provided on the upper chord of the planar tensioned truss 3. Controllable fracture nodes 2 are provided on N cross sections of the upper chord of at least one planar tensioned truss 3, the number of controllable fracture nodes 2 on each cross section being the same as the number of chord members of the upper chord truss 34. The upper chord controllable fracture nodes 2 on the N cross sections divide the upper chord truss into N+1 connecting segments, where N≥1.

[0017] The number of controllable fracture nodes depends on the number of pre-collapsed areas.

[0018] The connection nodes of each component include three types: one is a connecting ear plate located at the upper end of the abdominal strut 31, connecting the upper chord truss 34 and the abdominal strut 31; another is a cable node 36 located at the lower end of the abdominal strut 31, connecting the abdominal strut 31 with the lower chord segment cable 33 and the lower cross cable; and the third is an ear plate type node used to connect the abdominal cross cable 35, connecting the upper cross cable and the lower cross cable, and its arrangement is an X-shaped cross.

[0019] The structure of the planar tensioned truss 3 is as follows Figure 2 As shown, the structure includes an upper chord truss 34, web struts 31, cross cables 35, lower chord segment cables 33, ear-plate nodes 32, and cable nodes 36. The upper chord truss 34 and web struts 31 are connected by ear-plate hinges. Both ends of the upper chord truss 34 and the lower chord segment cables 33 in the planar tensioned truss 3 are fixed to ball supports. The web cross cables 35 have four external nodes, connected to the upper and lower ends of two adjacent web struts 31, respectively. The lower chord segment cables 33 are fixed to both ends of the upper chord truss 34. Cable nodes 36 are located at the lower ends of the web struts 31, and the lower ends of the web cross cables 35, the lower ends of adjacent web struts 31, and adjacent lower chord segment cables 33 are hinged to cable nodes 36. The upper chord truss 34 of the multi-section planar tensioned truss 3 has three chords forming an inverted triangle. There are 3 controllable fracture nodes 2 on the upper chord of the tensioned truss 3 section located in the plane, which are located on each upper chord truss 34.

[0020] The structure of the upper chord controllable fracture node 2 is as follows Figure 3 , Figure 4 As shown, it includes a welded hollow sphere 21, a connecting body 22, an outer rod 23, and an inner rod 24. The inner rod 24 is welded to the welded hollow sphere 21, and the outer rod 23 is hinged to the connecting body 22 via a directional joint 225. The connecting body 22 and the welded hollow sphere 21 are welded together.

[0021] The connector 22 includes a shear pin 221, a connector box 222, a plug block 223, and a directional joint 225. The connector box 222 is provided with a pin hole and a plug block hole, and the plug block 223 is also provided with a pin hole. The plug block 223 is inserted into the plug block hole of the connector box 222. The plug block 223 is detachably connected to the connector box 222 through the shear pin 221 inserted into the pin hole. The plug block 223 is connected to the outer rod 224 through the directional joint 225.

[0022] The directional joint 225 includes a sleeve 2251, a directional joint bearing 2252, and a directional joint pin 2253. The outer ring of the directional joint bearing 2252 is fixed inside the sleeve 2251. The directional joint is fitted into the connecting ring of the outer rod and connected by the inner ring of the insert block 223. Finally, the directional joint pin 2253 is fixed to the inner ring of the directional joint bearing 2252.

[0023] like Figure 3 As shown, when the lower chord segment cable 33 fails due to material aging, corrosion, or impact, the original force transmission path is interrupted, and the bending moment at the corresponding position of the upper chord truss increases sharply, easily triggering progressive collapse. At this time, the abdominal cross cable 35 quickly comes into play. This cross cable 35 consists of two upper cross cables and two lower cross cables, arranged in an X shape. The upper and lower cross cables are connected by ear plate nodes. The upper ends of the upper cross cables and the upper ends of the adjacent vertical struts are hinged to the upper chord truss through connecting ear plates. The lower ends of the lower cross cables, the lower ends of the adjacent vertical struts, and the adjacent lower chord segment cables are hinged to cable nodes 36. After the lower chord segment cable fails, internal force redistribution occurs at cable nodes 36. The unbalanced force is transmitted to the cross cables through cable nodes 36, thereby quickly reconstructing a new force transmission path, limiting the spread of damage, ensuring the overall stability of the structure, and achieving the function of resisting progressive collapse.

[0024] like Figure 1 As shown, above the two relatively weak support columns 1, a pre-defined weak pre-collapse zone is formed in the structure. When the two support columns 1 on the lower side of the planar tensioned truss 3 fail due to the disaster, the vertical support force is lost, and the corresponding area of ​​the planar tensioned truss shows a downward deformation trend, the upper chord controllable fracture node 2 is triggered to take effect according to the preset mechanism: the upper chord controllable fracture node 2, after mechanical calculation and experimental verification, can accurately fracture under specific loads, which guides the pre-collapse zone to collapse in an orderly manner along the preset path, avoiding secondary damage. On the one hand, it guides the pre-collapse zone to collapse in an orderly manner, and on the other hand, through the disconnection action of the node, it limits the collapse range within this area and prevents it from spreading to adjacent structural areas, ultimately achieving the anti-collapse synergistic function of resisting and isolating.

Claims

1. A spatial tensioned truss structure with anti-collapse synergistic function, comprising multiple planar tensioned trusses and multiple support columns supporting the multiple planar tensioned trusses, characterized in that: The planar tensioned truss includes an upper chord truss, web struts, web cross cables, lower chord segmented cables, cable nodes, and controllable fracture nodes in the upper chord. The web cross cables connect adjacent web struts. Each segment of the lower chord is connected to an adjacent cable node, and the anchorage ends of the side span segmented cables are anchored at the upper chord truss supports. Controllable fracture nodes are provided on N sections of the upper chord truss of at least one planar tensioned truss, the number of controllable fracture nodes on each section being equal to the number of chords in the upper chord truss. With the same number of members, the controllable fracture nodes of the upper chord on N cross-sections divide the upper chord truss into N+1 connection segments, where N≥1; the controllable fracture nodes of the upper chord include inner members, connecting bodies, and outer members; the connecting body includes a connecting box, a plug, a shear pin, a pin shaft, and a directional joint; the connecting box is fixed to the node of the inner member; one end of the plug is connected to the connecting box via a shear pin, and the other end of the plug is connected to the outer member via the directional joint.

2. The space tensioned truss structure with anti-collapse synergistic function according to claim 1, characterized in that, The connecting box is provided with a pin hole and a plug hole, and the plug is also provided with a pin hole; the plug is inserted into the plug hole of the connecting box, and the plug is detachably connected to the connecting box by a shear pin inserted into the pin hole.

3. The space tensioned truss structure with anti-collapse synergistic function according to claim 1, characterized in that, The connecting box includes a sphere and a box body, with the box body welded to the sphere; the inner rod is fixed to the sphere.

4. The space tensioned truss structure with anti-collapse synergistic function according to claim 1, characterized in that, The directional joint includes a sleeve, a directional joint bearing, and a directional joint pin; the outer ring of the directional joint bearing is fixed inside the sleeve, the directional joint is fitted into the connecting ring of the outer rod, and is connected by the inner ring of the insert block; finally, the directional joint pin is fixed to the inner ring of the directional joint bearing.

5. The space tensioned truss structure with anti-collapse synergistic function according to claim 1, characterized in that, The abdominal cross cable includes two upper cross cables and two lower cross cables, which are connected by ear plate type nodes.

6. The space tensioned truss structure with anti-collapse synergistic function according to claim 1, characterized in that, The cable node is located at the lower end of the abdominal strut, and the lower ends of the abdominal cross cable, the lower ends of the adjacent vertical strut, and the adjacent lower chord segment cable are hinged to the cable node.

7. The space tensioned truss structure with anti-collapse synergistic function according to claim 1, characterized in that, A connecting lug is provided at the upper end of the abdominal strut, and the upper end of the abdominal cross cable is hinged to the upper end of the adjacent vertical strut on the upper chord truss through the connecting lug.

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