A tensile structural system with flexible boundaries

Abstract

A tension structure system with a flexible boundary comprises an upper chord rigid shell, a web, a lower chord cable net, a radiation pressure bar truss and a stabilizing truss, wherein the radiation pressure bar truss forms a basic skeleton of the structure through a stabilizing truss, the upper chord rigid shell is freely formed according to the shape requirements and rigidly connected to the basic skeleton, the lower chord cable net is symmetrically arranged on the lower chords on both sides of the pressure bar truss, the upper chord shell and the lower chord cable net form a spatial force system through the web, and can be applied to building structures and also to the field of antennas. If movement or rotation is required, compared with other structural systems, the light weight and small rotational inertia greatly reduce the burden of the motion control system, and therefore has broad application prospects.

Description

Technical Field

[0001] The invention relates to the technical field of structural engineering, and in particular to a flexible boundary tensioning structure system. Background Art

[0002] The existing tensile structures, especially the system structure based on the suspensory dome, have the disadvantage that they must have a rigid boundary to provide external tension, have initial geometric defects, and are prone to instability, causing overall structural failure. Summary of the invention

[0003] The purpose of this new application is to overcome the defect that the tension structure must have a rigid boundary to provide external force, and to design a self-adjusting, stable truss position structure foundation position freely adjustable support and flexible boundary tension structure system.

[0004] In order to achieve the above-mentioned purpose, the present invention designs a tension structure system with a flexible boundary, including an upper chord rigid shell, a web, a lower chord cable net, a radial compression bar truss, and a stabilizing truss. The radial compression bar truss forms a basic skeleton of the structure through the stabilizing truss, the upper chord rigid shell is freely formed according to the shape requirements and is rigidly connected to the basic skeleton, the lower chord cable net is symmetrically arranged on the lower chord on both sides of the compression bar truss, and the upper chord shell and the lower chord cable net form a spatial force system through the web.

[0005] A further solution is that the lower chord cable net is composed of cables evenly staggered in the longitudinal and transverse directions, and the lower chord cable net is evenly distributed on both sides of the radiation pressure bar truss and is hinged to the lower chord node of the radiation pressure bar truss. The prestress of the lower chord cable net forms a closed stress loop through the radiation pressure bar truss: at the hinge of the lower chord node of the radiation pressure bar truss and the lower chord cable net, at each node, the internal force of the radiation pressure bar truss is equal in magnitude and opposite in direction to the resultant internal force of the two cables, achieving self-balance of the internal force. The characteristic of this structure is that it does not require a rigid boundary to provide external force, which greatly broadens the application field of tension structures.

[0006] A further solution is that the upper chord rigid shell is rigidly connected to the upper chord of the radiation strut truss, and the upper chord rigid shell is connected to the lower chord cable net through a strut.

[0007] A further solution is that the curved surface shape of the upper chord rigid shell is a free-form surface suitable for the shape requirements of the overall tension structure system.

[0008] A further solution is that the curve of the radiation strut truss should be consistent with the free-form surface of the upper chord rigid shell.

[0009] A further solution is that the stabilizing truss is arranged on a fixed support or a movable support.

[0010] A further solution is that the radiation strut truss is composed of two planar trusses arranged crosswise and symmetrically, including an upper chord, a lower chord and a radiation web, and the shape of the upper chord of the radiation strut truss in the plane is consistent with the shape of the overall structure.

[0011] A further solution is that the stabilizing truss is composed of multiple triangular three-dimensional trusses, including two upper chords, two lower chords and a stabilizing web, and the shape of the upper chord of the stabilizing truss in the plane is consistent with the shape of the overall structure, and the lower part of the stabilizing truss is equipped with a pulley that can move along a track.

[0012] A further solution is that each node of the upper chord rigid shell is connected to the corresponding four nodes on the lower chord cable net through a web rod, and each node on the edge line of the upper chord rigid shell is connected to the corresponding two nodes on the edge line of the lower chord cable net through a web rod.

[0013] A further solution is that the center of the upper chord of the basic skeleton is concave and the four corners are raised, and the lower chord cable net is an overall concave parabola / ellipsoid / sphere.

[0014] The characteristics and beneficial effects of the present invention are as follows: the flexible boundary tension structure system is proposed on the basis of tension structure, especially chord-supported dome, and this system has the characteristics of tension structure, while overcoming the disadvantage that the tension structure must have a rigid boundary to provide external tension, and reasonably arranges the cable net to form a closed loop through the radiation strut truss to achieve a self-balancing body. The self-balancing structural system can adjust the position of the stable truss, so that the support position can be freely adjusted according to the position of the structural foundation.

[0015] The upper chord rigid shell can be freely determined according to the shape requirements of the structure, and is jointly stressed by the web rod and the lower chord cable net, which greatly reduces the deadweight of the structure compared with the ordinary truss structure; when the structure is used as a moving body, the advantages are more obvious, the structure is light, and the surface shape can be diverse. It can be used in building structures as well as in the field of antennas. If movement or rotation is required, compared with other structural systems, the light deadweight and smaller moment of inertia greatly reduce the burden of the motion control system, so it has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an axonometric drawing of the present invention.

[0017] Figure 2 It is a schematic diagram of the basic skeleton in the present invention.

[0018] Figure 3 It is a schematic diagram of the connection between the basic skeleton and the upper string rigid shell in the present invention.

[0019] Figure 4It is a schematic diagram of the connection between the basic skeleton and the lower chord network in the present invention.

[0020] Figure 5 It is a schematic diagram of the connection between the basic skeleton and the belly rod in the invention.

[0021] Figure 6 It is a top view of this embodiment.

[0022] Figure 7 It is a front view of this embodiment.

[0023] Figure 8 It is a left view of this embodiment.

[0024] Fig. 9 This is a force analysis diagram of the hinged joint of the lower chord node of the radiation strut truss in this embodiment. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings:

[0026] Example 1

[0027] like Figures 1 to 5 As shown, the present invention provides a technical solution, a tension structure system with a flexible boundary, comprising an upper chord rigid shell 1, a web 2, a lower chord cable net 3, a radiation compression rod truss 4, and a stabilizing truss 5. The radiation compression rod truss 4 forms a basic skeleton of the structure through the stabilizing truss 5. The upper chord rigid shell 1 is freely formed according to the shape requirements and rigidly connected to the basic skeleton. The lower chord cable net 3 is symmetrically arranged on the lower chords on both sides of the compression rod truss 4. The upper chord shell 1 and the lower chord cable net 3 form a spatial force system through the web 2.

[0028] like Figure 4 , Fig. 9 As shown, the lower chord net 3 is composed of uniformly staggered cables in the longitudinal and transverse directions, and the lower chord net 3 is uniformly distributed on both sides of the radiation pressure rod truss 4 and is hinged with the lower chord node of the radiation pressure rod truss 4. The prestress of the lower chord net 3 forms a closed stress loop through the radiation pressure rod truss 4: at the hinge of the lower chord node of the radiation pressure rod truss 4 and the lower chord net 3, at each node, the internal force of the radiation pressure rod truss 4 is equal in magnitude and opposite in direction to the resultant internal force of the two cables, achieving self-balance of the internal force. The characteristic of this structure is that it does not require a rigid boundary to provide external force, which greatly broadens the application field of the tension structure.

[0029] like Figure 3 As shown, the upper chord rigid shell 1 is rigidly connected to the upper chord of the radiation strut truss 4, and the upper chord rigid shell 1 is connected to the lower chord cable net 3 through a strut.

[0030] like Figure 1 , Figure 3As shown, the curved surface shape of the upper chord rigid shell 1 is a free-form surface suitable for the shape requirements of the overall tension structure system.

[0031] like Figure 1 , Figure 4 As shown, the curve of the radiation strut truss 4 should be consistent with the free curved surface of the upper chord rigid shell 1.

[0032] The stabilizing truss 5 is arranged on a fixed support or a movable support.

[0033] like Figure 2 As shown, the radiation compression rod truss 4 is composed of two plane trusses arranged in a cross-symmetric manner, including an upper chord rod, a lower chord rod and a radiation web rod, and the shape of the upper chord of the radiation compression rod truss 4 in the plane is consistent with the shape of the overall structure; the stabilizing truss 5 is composed of multiple triangular three-dimensional trusses, including two upper chord rods, two lower chord rods and a stabilizing web rod, and the shape of the upper chord of the stabilizing truss 5 in the plane is consistent with the shape of the overall structure, and the lower part of the stabilizing truss 5 is equipped with a pulley that can move along the track.

[0034] like Figures 6 to 8 As shown, when the overall system is used as an antenna structure, the upper surface of the basic skeleton in this embodiment is a cylindrical parabola, with a projected size of 40m in both directions, and moves 45 degrees to the left and right along the track. The overall structure provides support for the reflective mesh surface laid on the upper chord rigid shell. The surface accuracy of the antenna reflective surface changes with the change of the movement angle of the antenna, and other loads such as wind load size and direction, snow load, etc. change at all times during the movement. The upper chord rigid shell and the lower cable net provided by the present invention work together through the struts, greatly improving the structural rigidity, controlling the displacement changes under different working conditions, and reducing the moment of inertia. All loads on the antenna are transmitted to the antenna base structure through the spatial structure composed of the rigid shell and the lower cable net, and the vertical external force is transmitted to the antenna base structure through the basic skeleton composed of the radiation pressure bar truss and the stabilizing truss. At the same time, the symmetrically arranged cable net and the rigid shell also provide out-of-plane stability for the radiation pressure bar truss, which can further reduce the weight of the pressure bar truss.

[0035] The specific implementation methods described above further describe the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A flexible boundary tension structure system, comprising an upper chord rigid shell (1), a web member (2), a lower chord cable net (3), a radial compression rod truss (4), and a stabilizing truss (5), characterized in that: The radial compression rod truss (4) forms a basic skeleton of the structural system through a stabilizing truss (5); the upper chord rigid shell (1) is freely formed according to the shape requirements and rigidly connected to the basic skeleton; one end of the web member (2) is connected to a node on the upper chord rigid shell (1), and the other end is connected to a corresponding node on the lower chord cable net (3), so that the upper chord rigid shell (1) and the lower chord cable net (3) form a spatial force system through the web member (2); The lower chord cable net (3) is composed of cables that are evenly staggered in the longitudinal and transverse directions, and the upper diagonal position of the lower chord cable net (3) is hinged to the lower chord node of the radial compression rod truss (4). The lower chord cable net (3) is symmetrically tensioned on the basic skeleton to form a tensioning internal force loop, thereby achieving internal force self-balance; The upper chord rigid shell (1) is rigidly connected to the upper chord of the radiation compression rod truss (4), and the upper chord rigid shell (1) is connected to the lower chord cable net (3) via a web bar (2); The curved surface shape of the upper chord rigid shell (1) is a free-form surface suitable for the shape requirements of the overall tension structure system.

2. The flexible boundary tension structure system according to claim 1, characterized in that: The curve of the radiation strut truss (4) should be consistent with the free-form surface of the upper chord rigid shell (1).

3. The flexible boundary tension structure system according to claim 1, characterized in that: The stabilizing truss (5) is arranged on a fixed support or a movable support.

4. The flexible boundary tension structure system according to claim 1, characterized in that: The radiation strut truss (4) is composed of two plane trusses arranged in a cross-symmetric manner, comprising an upper chord, a lower chord and a radiation web, and the shape of the upper chord of the radiation strut truss (4) in the plane is consistent with the shape of the overall structure.

5. The flexible boundary tension structure system according to claim 1, characterized in that: The stabilizing truss (5) is composed of a plurality of triangular three-dimensional trusses, including two upper chords, two lower chords and a stabilizing web, and the shape of the upper chord of the stabilizing truss (5) in a plane matches the shape of the overall structure, and the lower part of the stabilizing truss (5) is provided with a pulley that can move along a track.

6. The flexible boundary tension structure system according to claim 1, characterized in that: Each node of the upper chord rigid shell (1) is connected to four corresponding nodes on the lower chord cable net (3) via a web bar (2), and each node on the side line of the upper chord rigid shell (1) is connected to two corresponding nodes on the side line of the lower chord cable net (3) via a web bar (2).

7. The flexible boundary tension structure system according to claim 1, characterized in that: The center of the upper chord of the basic skeleton is concave and the four corners are raised, and the lower chord cable net (3) is in the form of a concave parabolic cylinder / ellipsoid / spherical surface as a whole.

Images