Novel combined cable truss structure

Abstract

The invention provides a novel combined cable truss structure, and relates to the field of large-span space structure design in constructional engineering. The structure is composed of an inner cable truss, an outer cable truss and an outer ring compression ring beam. The outer cable truss comprises a middle ring upper ring cable, a middle ring lower ring cable, a middle ring vertical pressing rod, an outer cable truss upper chord cable, an outer cable truss lower chord cable and an outer cable truss sling; the outer cable truss upper chord cables and the outer cable truss lower chord cables are arranged in a crossed mode. The two ends of an upper chord cable of the outer cable truss are connected to the middle ring upper ring cable and the outer ring compression ring beam correspondingly. The two ends of a lower chord cable of the outer cable truss are connected to the middle ring lower ring cable and the outer ring compression ring beam respectively; the upper end and the lower end of the outer cable truss sling are connected to the outer cable truss upper chord cable and the outer cable truss lower chord cable correspondingly. The upper end and the lower end of the middle ring vertical pressing rod are connected to the middle ring upper ring cable and the middle ring lower ring cable respectively. The outer cable truss chord cables are arranged in a crossed mode instead of a spoke mode, so that the lateral rigidity of the cable truss is improved, and the redundancy of the cable truss can be improved.

Description

Technical Field

[0001] The invention relates to the field of large-span spatial structure design in construction engineering, and in particular to a novel combined cable truss structure. Background Art

[0002] Cable truss structures are widely used in roof structure systems of large stadiums due to their beautiful shape, light weight, high structural efficiency and convenient construction. Cable truss structures are composed of upper and lower layers of cable nets and intermediate rods (vertical rods or slings). Cable trusses require prestressing of cables and rods to achieve rigidity in order to withstand external loads.

[0003] In addition, in the common cable truss structure, one end of the upper and lower chords intersect at one point, and the other end intersects with the vertical rod or is connected to the surrounding compression ring beam; while the upper and lower chords of the combined cable truss structure intersect at one point at both the inner and outer ends, such as Figure 1 As shown in the figure, the upper and lower chords of the combined cable truss structure intersect at the inner ring cable in the inner circle and intersect at the support of the compression ring beam in the outer circle. The combined cable truss can be divided into two substructures, the inner cable truss and the outer cable truss. The inner cable truss is connected to the ring cable of the outer cable truss, and the outer cable truss is connected to the peripheral compression ring beam.

[0004] In the prior art, all upper and lower chords of the combined cable truss structure are arranged in a spoke-like manner, and their lateral stiffness is relatively weak. It is often necessary to set up supporting rods such as secondary cables to ensure that they have a certain lateral stiffness. In addition, the upper and lower chords are arranged in a spoke-like manner, which makes the structural redundancy insufficient. When the local rods are damaged, it is difficult for the remaining structural system to reconstruct the force transmission path, which is easy to cause multi-mode chain failures such as cable rod instability and node damage, that is, the structure has weak resistance to continuous collapse. Compared with the outer cable truss, the mechanical properties of the inner cable truss are relatively independent. Under the action of external loads, the inner cable truss transfers the load to the outer ring compression ring beam support through the outer cable truss. The damage of the inner cable truss rods will not cause the damage of the overall structure. However, when the rods of the outer cable truss are damaged, on the one hand, they cannot bear their own loads, and on the other hand, they cannot transfer the loads of the inner cable truss. Therefore, the damage of the outer cable truss rods has a greater impact on the overall structure.

[0005] Therefore, it is necessary to provide a solution that can improve the anti-progressive collapse performance of the overall combined cable truss structure. Summary of the invention

[0006] In order to solve the problems that the lateral stiffness of the chords of the outer cable truss in the existing combined cable truss structure is weak and the structure may fail when the rods are damaged, the present application proposes a new combined cable truss structure. The new structure changes the outer cable truss chords of the existing combined cable truss from a spoke-type arrangement to a cross-type arrangement. This arrangement not only improves the lateral stiffness of the cable truss, but also improves the redundancy of the cable truss, that is, improves the continuous collapse resistance of the overall structure.

[0007] To achieve the above-mentioned purpose, some embodiments of the present application provide a novel combined cable truss structure, which is composed of an inner cable truss, an outer cable truss and an outer compression ring beam; Among them, the outer cable truss includes a middle circle upper ring cable, a middle circle lower ring cable, a middle circle vertical compression rod, an outer cable truss upper chord, an outer cable truss lower chord and an outer cable truss suspension cable; the outer cable truss upper chord and the outer cable truss lower chord are arranged in a cross-type, and a plurality of intersections are located on the outer circle compression ring beam, and each intersection leads to two outer cable truss upper chords and two outer cable truss lower chords; the two ends of the outer cable truss upper chord are respectively connected to the middle circle upper ring cable and the outer circle compression ring beam; the two ends of the outer cable truss lower chord are respectively connected to the middle circle lower ring cable and the outer circle compression ring beam; the upper and lower ends of the outer cable truss suspension cable are respectively connected to the outer cable truss upper chord and the outer cable truss lower chord; the upper and lower ends of the middle circle vertical compression rod are respectively connected to the middle circle upper ring cable and the middle circle lower ring cable.

[0008] Furthermore, the inner cable truss includes an inner ring cable, an inner cable truss upper chord, an inner cable truss lower chord and an inner cable truss suspension cable; the inner cable truss upper chord and the inner cable truss lower chord are arranged in a spoke type; the two ends of the inner cable truss upper chord are respectively connected to the middle circle upper ring cable and the inner ring cable of the outer cable truss; the two ends of the inner cable truss lower chord are respectively connected to the middle circle lower ring cable and the inner ring cable of the outer cable truss; the upper and lower ends of the inner cable truss suspension cable are respectively connected to the inner cable truss upper chord and the inner cable truss lower chord.

[0009] Furthermore, the inner cable truss includes an inner ring cable, an inner cable truss upper chord, an inner cable truss lower chord and an inner cable truss suspension cable; the inner cable truss upper chord and the outer cable truss lower chord are arranged in a cross-type manner, and a plurality of intersections are located on the inner ring cable, and each intersection leads to two inner cable truss upper chords and two inner cable truss lower chords; the two ends of the inner cable truss upper chord are respectively connected to the middle circle upper ring cable and the inner ring cable of the outer cable truss; the two ends of the inner cable truss lower chord are respectively connected to the middle circle lower ring cable and the inner ring cable of the outer cable truss; the upper and lower ends of the inner cable truss suspension cable are respectively connected to the inner cable truss upper chord and the inner cable truss lower chord.

[0010] Furthermore, the upper chord of the outer cable truss has a negative curvature, the lower chord of the outer cable truss has a positive curvature, and the outer cable truss suspension cable connecting the upper and lower chords of the outer cable truss bears tension.

[0011] Furthermore, the upper chord of the inner cable truss has a negative curvature, the lower chord of the inner cable truss has a positive curvature, and the inner cable truss suspension cable connecting the upper and lower chords of the inner cable truss bears tension.

[0012] Furthermore, the upper chord of the outer cable truss and the upper chord of the inner cable truss have a positive curvature, and the lower chord of the outer cable truss and the lower chord of the inner cable truss have a negative curvature. When the outer cable truss suspension cable and the inner cable truss suspension cable are replaced with an outer cable truss compression rod and an inner cable truss compression rod, the outer cable truss compression rod, the inner cable truss compression rod and the middle circle vertical compression rod are subjected to pressure.

[0013] Compared with the prior art, the beneficial effects that can be achieved by at least one of the above technical solutions adopted in the present application include at least: (1) Improved lateral stiffness. When the chords of the existing cable trusses are arranged in a spoke-like manner, each unit where the chords are located has no lateral support, that is, no lateral stiffness, and additional lateral support rods (such as secondary cables) are required in the project. When the chords of the cable trusses of the present application are arranged in a cross-type manner, each node of the chords is connected by 4 cross-cables, which naturally have lateral stiffness and do not require additional lateral support rods.

[0014] (2) Improved structural resistance to progressive collapse. The chords of the external cable truss of the present application are arranged in a cross-type manner, so that each node of the external cable truss has multiple effective backup load transfer paths. When the cable truss member is damaged, the structure can form a backup load transfer path and have a strong prestress redistribution ability, which greatly improves the structural redundancy, that is, greatly improves the structural resistance to progressive collapse.

[0015] (3) The Type I combined cable truss of the present application, considering that the damage of the chords of the inner cable truss has a relatively small impact on the overall structure, the chords of the inner cable truss are still arranged in a spoke-like manner, which can reduce the amount of cables used in the inner cable truss.

[0016] (4) In the Type II combined cable truss of the present application, the chords of the inner cable truss are arranged in a cross-type manner, and the overall stiffness and progressive collapse resistance of the structure are better than those of the Type I combined cable truss. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a combined cable truss structure of the prior art; Figure 2 It is a three-dimensional axonometric diagram of the type I combined cable truss structure of the present invention; Figure 3 It is a plan view of the type I combined cable truss structure of the present invention; Figure 4 It is a three-dimensional axonometric diagram of the type II combined cable truss structure of the present invention; Figure 5 It is a plan view of the type II combined cable truss structure of the present invention; Figure 6 A three-dimensional axonometric diagram of an outer cable truss with a cross-chord arrangement according to the present invention; Figure 7 A three-dimensional axonometric diagram of the inner cable truss of the present invention with a chord-cable spoke arrangement; Figure 8 It is a three-dimensional axonometric diagram of the inner cable truss with the cross-chord arrangement of the present invention.

[0018] In the figure: 1. outer ring compression ring beam, 2. middle ring upper ring cable, 3. middle ring lower ring cable, 4. middle ring vertical compression rod, 5. outer cable truss upper chord cable, 6. outer cable truss lower chord cable, 7. outer cable truss suspension cable, 8. inner ring cable, 9. inner cable truss upper chord cable, 10. inner cable truss lower chord cable, 11. inner cable truss suspension cable. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0020] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0021] In order to solve the problems of weak lateral stiffness, insufficient structural redundancy, and easy multi-mode chain failure such as cable rod instability and node damage caused by the spoke arrangement of all upper and lower chords of the existing combined cable truss structure, the embodiment of the present application proposes a new type of combined cable truss structure, which changes the upper and lower chords of the existing combined cable truss structure from a spoke arrangement to a cross arrangement. This arrangement not only improves the lateral stiffness of the cable truss, but also improves the redundancy of the cable truss.

[0022] In one embodiment, a type I combined cable truss structure is used. The type I combined cable truss structure only arranges the upper and lower chords of the outer cable truss in a cross arrangement. The three-dimensional axonometric diagram and the plan view of the type I combined cable truss structure are respectively as shown in FIG. Figure 2 and 3 As shown, the type I combined cable truss structure consists of an outer cable truss ( Figure 6 ) and the inner cable truss with the chords arranged in a spoke-like manner ( Figure 7 ) are combined.

[0023] Combination Figure 2 , Figure 3 and Figure 7 The inner cable truss of the type I combined cable truss structure is composed of an inner ring cable 8, an inner cable truss upper chord 9, an inner cable truss lower chord 10 and an inner cable truss suspension cable 11. The inner cable truss upper chord 9 and the inner cable truss lower chord 10 are arranged in a spoke-like manner; the two ends of the inner cable truss upper chord 9 are respectively connected to the middle circle upper ring cable 2 and the inner ring cable 8 of the outer cable truss; the two ends of the inner cable truss lower chord 10 are respectively connected to the middle circle lower ring cable 3 and the inner ring cable 8 of the outer cable truss; the upper and lower ends of the inner cable truss suspension cable 11 are respectively connected to the inner cable truss upper chord 9 and the inner cable truss lower chord 10. Among them, the inner cable truss upper chord 9 has a negative curvature, and the inner cable truss lower chord 10 has a positive curvature, so the inner cable truss suspension cable 11 connecting the inner cable truss upper and lower chords is subjected to tension.

[0024] In another embodiment, a type II combined cable truss structure is used. The type II combined cable truss structure arranges the upper and lower chords of the inner and outer cable trusses in a cross-arrangement. The three-dimensional axonometric diagram and the plan view of the type II combined cable truss structure are shown in FIG. Figure 4 and 5 As shown, the type II combined cable truss structure consists of an outer cable truss ( Figure 6 ) and the inner cable truss with the chords arranged in a cross pattern ( Figure 8 ) are combined.

[0025] Combination Figure 4 , Figure 5 and Figure 8 The inner cable truss of the type II combined cable truss structure is composed of an inner ring cable 8, an inner cable truss upper chord cable 9, an inner cable truss lower chord cable 10 and an inner cable truss suspension cable 11. The inner cable truss upper chord cable 9 and the outer cable truss lower chord cable 10 are arranged in a cross-type, and multiple intersections are located on the inner ring cable 8. Each intersection leads to two inner cable truss upper chord cables 9 and two inner cable truss lower chord cables 10; the two ends of the inner cable truss upper chord cable 9 are respectively connected to the middle circle upper ring cable 2 and the inner ring cable 8 of the outer cable truss; the two ends of the inner cable truss lower chord cable 10 are respectively connected to the middle circle lower ring cable 3 and the inner ring cable 8 of the outer cable truss; the upper and lower ends of the inner cable truss suspension cable 11 are respectively connected to the inner cable truss upper chord cable 9 and the inner cable truss lower chord cable 10.

[0026] In the above two embodiments, combined Figure 2-6The outer cable truss structure of the type I combined cable truss structure and the type II combined cable truss structure is the same, and is composed of a middle circle upper ring cable 2, a middle circle lower ring cable 3, a middle circle vertical compression rod 4, an outer cable truss upper chord cable 5, an outer cable truss lower chord cable 6 and an outer cable truss sling cable 7. The outer cable truss upper chord 5 and the outer cable truss lower chord 6 are arranged in a cross-type, and multiple intersections are located on the outer ring compression ring beam 1, and each intersection leads to two outer cable truss upper chords 5 and two outer cable truss lower chords 6; the two ends of the outer cable truss upper chord 5 are respectively connected to the middle ring upper ring cable 2 and the outer ring compression ring beam 1; the two ends of the outer cable truss lower chord 6 are respectively connected to the middle ring lower ring cable 3 and the outer ring compression ring beam 1; the upper and lower ends of the outer cable truss sling 7 are respectively connected to the outer cable truss upper chord 5 and the outer cable truss lower chord 6; the upper and lower ends of the middle ring vertical compression rod 4 are respectively connected to the middle ring upper ring cable 2 and the middle ring lower ring cable 3.

[0027] In the above two embodiments, the outer cable truss upper chord 5 and the inner cable truss upper chord 9 have negative curvature, and the outer cable truss lower chord 6 and the inner cable truss lower chord 10 have positive curvature, ensuring that all vertical outer cable truss slings 7 and inner cable truss slings 11 are subjected to tension.

[0028] In some embodiments, for the inner and outer cable trusses, if the outer cable truss upper chord 5 and the inner cable truss upper chord 9 have positive curvature, and the outer cable truss lower chord 6 and the inner cable truss lower chord 10 have negative curvature, the outer cable truss suspension cable 7 and the inner cable truss suspension cable 11 in the above two embodiments need to be replaced with an outer cable truss compression rod and an inner cable truss compression rod, and the outer cable truss compression rod, the inner cable truss compression rod and the middle circle vertical compression rod are subjected to pressure.

[0029] In addition, the position of the middle circle vertical compression rod of the new combined cable truss structure, as well as the topological relationship (number of crossings) between the upper and lower chords of the inner and outer cable trusses, can be optimized and adjusted according to the architectural shape and force analysis.

[0030] The present invention proposes a new type of combined cable truss structure, which includes two forms: type I combined cable truss and type II combined cable truss. The mechanical properties of the new type of combined cable truss structure are greatly improved. The details are as follows: (1) Improved lateral stiffness. In the prior art, when the chords of the inner and outer cable trusses are arranged in a spoke-like manner, each unit where the chords are located has no lateral support, that is, no lateral stiffness, and additional lateral support rods (such as secondary cables) are required in the project. When the chords of the cable truss are arranged in a cross-type manner, each node of the chord is connected by four cross-cables, which naturally has lateral stiffness and does not require additional lateral support rods.

[0031] (2) Improved structural resistance to progressive collapse. The chords of the external cable truss of the present application are arranged in a cross-type manner, so that each node of the external cable truss has multiple effective backup load transfer paths. When the cable truss member is damaged, the structure can form a backup load transfer path and have a strong prestress redistribution ability, which greatly improves the structural redundancy, that is, greatly improves the structural resistance to progressive collapse.

[0032] (3) Type I combined cable truss: considering that the damage of the chord of the inner cable truss has a relatively small impact on the overall structure, the chord of the inner cable truss is still arranged in a spoke-like manner, which can reduce the amount of cables used in the inner cable truss.

[0033] (4) Type II composite cable truss, in which the chords of the inner cable truss are arranged in a cross-shaped manner, has better overall structural stiffness and progressive collapse resistance than Type I composite cable truss.

[0034] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and that the present application can be implemented in other specific forms without departing from the spirit or basic features of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present application is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present application. Any figure mark in the claims should not be regarded as limiting the claims involved. In addition, it is obvious that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices stated in the device claim can also be implemented by one unit or device through software or hardware.

Claims

1. A new type of combined cable truss structure, characterized in that: The structure consists of an inner cable truss, an outer cable truss and an outer compression ring beam; Among them, the outer cable truss includes a middle circle upper ring cable, a middle circle lower ring cable, a middle circle vertical compression rod, an outer cable truss upper chord, an outer cable truss lower chord and an outer cable truss suspension cable; the outer cable truss upper chord and the outer cable truss lower chord are arranged in a cross-type, and a plurality of intersections are located on the outer circle compression ring beam, and each intersection leads to two outer cable truss upper chords and two outer cable truss lower chords; the two ends of the outer cable truss upper chord are respectively connected to the middle circle upper ring cable and the outer circle compression ring beam; the two ends of the outer cable truss lower chord are respectively connected to the middle circle lower ring cable and the outer circle compression ring beam; the upper and lower ends of the outer cable truss suspension cable are respectively connected to the outer cable truss upper chord and the outer cable truss lower chord; the upper and lower ends of the middle circle vertical compression rod are respectively connected to the middle circle upper ring cable and the middle circle lower ring cable.

2. The structure according to claim 1, characterized in that: The inner cable truss comprises an inner ring cable, an inner cable truss upper chord, an inner cable truss lower chord and an inner cable truss suspension cable; the inner cable truss upper chord and the inner cable truss lower chord are arranged in a spoke type; the two ends of the inner cable truss upper chord are respectively connected to the middle circle upper ring cable and the inner ring cable of the outer cable truss; the two ends of the inner cable truss lower chord are respectively connected to the middle circle lower ring cable and the inner ring cable of the outer cable truss; the upper and lower ends of the inner cable truss suspension cable are respectively connected to the inner cable truss upper chord and the inner cable truss lower chord.

3. The method according to claim 1, characterized in that: The inner cable truss comprises an inner ring cable, an inner cable truss upper chord, an inner cable truss lower chord and an inner cable truss suspension cable; the inner cable truss upper chord and the outer cable truss lower chord are arranged in a cross-type manner, and a plurality of intersections are located on the inner ring cable, and each intersection leads to two inner cable truss upper chords and two inner cable truss lower chords; the two ends of the inner cable truss upper chord are respectively connected to the middle circle upper ring cable and the inner ring cable of the outer cable truss; the two ends of the inner cable truss lower chord are respectively connected to the middle circle lower ring cable and the inner ring cable of the outer cable truss; the upper and lower ends of the inner cable truss suspension cable are respectively connected to the inner cable truss upper chord and the inner cable truss lower chord.

4. The method according to claim 1, characterized in that: The upper chord of the outer cable truss has a negative curvature, the lower chord of the outer cable truss has a positive curvature, and the outer cable truss suspension cable connecting the upper and lower chords of the outer cable truss bears tension.

5. The method according to claim 2 or 3, characterized in that: The upper chord of the inner cable truss has a negative curvature, the lower chord of the inner cable truss has a positive curvature, and the inner cable truss suspension cable connecting the upper and lower chords of the inner cable truss bears tension.

6. The method according to claim 2 or 3, characterized in that: The upper chord of the outer cable truss and the upper chord of the inner cable truss have positive curvature, and the lower chord of the outer cable truss and the lower chord of the inner cable truss have negative curvature. When the outer cable truss suspension cable and the inner cable truss suspension cable are replaced with the outer cable truss compression rod and the inner cable truss compression rod, the outer cable truss compression rod, the inner cable truss compression rod and the middle circle vertical compression rod are subjected to pressure.

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