An alternating composite cable dome structure and implementation method thereof

Abstract

The embodiment of the present invention provides an alternating composite cable dome structure and an implementation method thereof, including: a support assembly, a cable assembly and an external pressure rigid ring beam; the support assembly includes: a central strut, equal-height double struts, a single strut, unequal-height double struts and a horizontal pressure bar, wherein the equal-height double struts, the single struts and the unequal-height double struts are arranged in sequence from the center of the cable dome to the outermost circle of the cable dome in each frame; the cable assembly includes: a ridge cable assembly, a ring cable assembly, an inclined cable assembly and an externally pulled inclined cable assembly, wherein the inclined cable assembly is arranged in sequence from the center of the cable dome to the outermost circle of the cable dome in each frame. The embodiment of the present invention provides an alternating composite cable dome structure, wherein the unequal-height double struts and the horizontal pressure bar are connected end to end to form a closed strut ring, and the struts, the ridge cables and the inclined cables form a tetrahedron structure, thereby improving the geometric stability of the cable dome structure, and the number of components is small, which is easy to construct, install and tension, reduces construction costs, and has good comprehensive economic benefits.

Description

Technical Field

[0001] The present invention relates to the technical field of building structures, and in particular to an alternating composite cable dome structure and an implementation method thereof. Background Art

[0002] A cable dome is a structure that is constantly in tension, consisting of discontinuous compression struts. It is also a self-balancing, self-supporting system composed of ridge cables, ring cables, and compression struts, which interact to form a structural system that continuously self-balances during its formation. Before prestressing the cables, the structure has no natural stiffness; stiffness develops after prestressing. Furthermore, the appropriate design of a cable dome significantly influences its structural stiffness and stability. Existing cable domes, both domestically and internationally, have a single geometric topology and structural form. While they offer significantly improved overall stability and stiffness compared to traditional cable domes, they require more joint members, making construction more complex. No single cable dome system combines long spans, overall stability, high lateral stiffness, uniform structural layout, and a minimal number of joint members. Summary of the Invention

[0003] The embodiments of the present invention provide an alternating composite cable dome structure and an implementation method thereof to overcome the defects of the prior art.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions.

[0005] An alternating composite cable dome structure comprises: a support assembly, a cable assembly and an external pressure rigid ring beam;

[0006] The support assembly includes: a central strut, double struts of equal height, a single strut, double struts of unequal height and a horizontal compression rod, wherein the double struts of equal height, the single strut and double struts of unequal height are arranged in sequence from the center of the cable dome to the outermost circle of the cable dome.

[0007] The cable assembly includes: a ridge cable assembly, a ring cable assembly, an oblique cable assembly and an outer pull oblique cable assembly, and the oblique cable assemblies are arranged in sequence from the center of the cable dome to the outermost circle of the cable dome in each frame;

[0008] The hoop assembly includes a first hoop, a second hoop and a third hoop, wherein the centers of the first hoop, the second hoop and the third hoop are located on the axis of the external pressure rigid ring beam, the first hoop is located below the central strut, the second hoop is located below the first hoop, and the third hoop is located below the second hoop;

[0009] The central support rod is vertically arranged above the axis of the external pressure rigid ring beam, with its upper end connected to the ridge cable assembly and its lower end connected to the oblique cable assembly;

[0010] The upper end points of the equal-height double struts, the single struts, and the unequal-height double struts are all connected to the chordae assembly and the oblique cable assembly;

[0011] The lower end points of the equal-height double braces, the single brace, and the unequal-height double braces are all connected to the oblique cable assembly and the ring cable assembly;

[0012] The adjacent equal-height double struts are connected at the upper end points of the ring to form a closed strut ring;

[0013] The unequal height double struts and the horizontal pressure rod are connected end to end to form a closed strut ring;

[0014] The external pressure rigid ring beam is connected to the outermost circle oblique cable assembly and the outermost circle ridge cable assembly.

[0015] Preferably, the notochord assembly comprises: an inner notochord, a first notochord, a second notochord and a third notochord;

[0016] The oblique cable assembly includes an inner oblique cable, a first single oblique cable, a double oblique cable, and a second single oblique cable, wherein the inner oblique cable, the first single oblique cable, the double oblique cable, and the second single oblique cable are arranged in sequence from the center of the dome outward to press the rigid ring beam;

[0017] The external pull-in cable assembly comprises: an external pull-in cable;

[0018] The upper end point of the external pull cable is connected to the upper end point of the third ridge cable and the upper end point of the unequal height double strut, and the lower end point is connected to the lower end point of the second ring cable, the double oblique cable and the single strut.

[0019] Preferably, the upper endpoints of the inner notochords intersect at one point and are radially arranged, the upper endpoint of the inner notochords are further connected to the upper endpoint of the central strut, and the lower endpoint is connected to the upper endpoint of the first notochord;

[0020] The lower endpoint of the first notochord is connected to the upper endpoint of the second notochord;

[0021] The lower endpoint of the second notochord is connected to the upper endpoint of the third notochord;

[0022] The lower end point of the third notochord is connected to the external pressure rigid ring beam.

[0023] Preferably, the first loop, the second loop and the third loop are all polygonal;

[0024] Each vertex of the first hoop cable is connected to the lower end point of the equal-height double strut and the lower end point of the first single oblique cable;

[0025] Each vertex of the second hoop is connected to the lower end point of the single strut, the lower end point of the external inclined cable and the lower end point of the double inclined cable;

[0026] Each vertex of the third hoop cable is connected to the lower end point of the unequal height double struts and the lower end point of the second single oblique cable.

[0027] Preferably, the lower endpoints of the inner oblique cables intersect and radiate, the lower endpoint of the inner oblique cables is also connected to the lower endpoint of the central strut, and the upper endpoint is connected to the upper endpoint of the equal height double strut, the lower endpoint of the inner chord, and the upper endpoint of the first chord;

[0028] The lower end point of the first mono-oblique cable is connected to the vertex of the first hoop cable and the lower end point of the equal-height double strut, and the upper end point of the first mono-oblique cable is connected to the upper end point of the single strut, the lower end point of the first notochord, and the upper end point of the second notochord;

[0029] The lower end point of the double oblique cable is connected to the apex of the second hoop cable and the lower end point of the single strut, and the upper end point is connected to the upper end point of the unequal height double strut and the lower end point of the second chord.

[0030] The lower end point of the second mono-oblique cable is connected to the apex of the third hoop cable and the lower end point of the unequal-height double strut, and the upper end point is connected to the externally compressed rigid ring beam and the lower end point of the third ridge cable.

[0031] Preferably, the planar projection of the cable dome structure is a standard circle.

[0032] Preferably, the horizontal projection of the equal-height double struts coincides with the first strop.

[0033] A method for implementing an alternating composite cable dome structure comprises the following steps:

[0034] S1. Determine the span and rise-to-span ratio of the cable dome structure, and determine the connection method between the outermost ring node of the cable dome structure and the external pressure rigid ring beam, including:

[0035] The span of the cable dome structure is selected according to the design requirements and actual conditions. The rise of the cable dome is preliminarily selected according to the relevant specifications of the cable. The connection between the external pressure rigid ring beam and the cable dome is hinged.

[0036] S2. Calculate the internal forces of the cable dome structure using the node balance method and the displacement method, including:

[0037] The cable dome structure is symmetrical along the centerline of each frame and also along the line of the innermost circle ridge cable. Assuming that the internal force of the central strut is V0, and the number of unknown force cables connected to the upper and lower ends of the central strut is more than 2, the internal force of each cable can be calculated using the node balance method. Similarly, the internal force of the equal-height double struts and the oblique cable connected to the first ring cable can be calculated. Similarly, the internal force of the single strut and the ridge cable can also be calculated.

[0038] The oblique cable, hoop cable and single strut connected to the second hoop cable are regarded as a unit and intersect at one point. The internal force of the single strut is applied to the node of the unit as a known external force. It is assumed that the node connected to the distal end of the oblique cable and hoop cable will not be displaced due to the external force, that is, the distal node is regarded as a hinge; the unit stiffness of the oblique cable and hoop cable is known, and the unit stiffness is calculated based on the unit stiffness of the oblique cable, hoop cable, ridge cable and single strut connected to the unit; the internal force of the single strut connected to the second hoop cable is known. When a known force acts on the unit node with known unit stiffness, the displacement of the unit under the action of the external force can be calculated; the cables in the unit intersect at one point, and the displacement of the unit node is also the displacement of the connection end point of the oblique cable and hoop cable; when the displacement and unit stiffness are both known, the internal forces of the hoop cable and the oblique cable can be calculated;

[0039] Similarly, the internal forces of the oblique cable, hoop cable, unequal height double struts and spinal cable connected to the third hoop cable can be obtained;

[0040] S3. Preliminary determination of component dimensions and prestressing force on the hoop cables:

[0041] The internal forces of each cable rod calculated by S2 are amplified to enable the structure to withstand the loads and deformation requirements specified in the code, and then applied to the cable dome structure. The displacement of the deformed cable dome structure is controlled within the range specified in the code. The cross-sectional dimensions of the cables and rods are selected based on the internal forces of the deformed cables.

[0042] S4. Conduct ultimate bearing capacity analysis, limit state analysis of normal use and other necessary analyses of the structure;

[0043] After S1-S3, the cable dome structure has sufficient stiffness and bearing capacity. According to the building structure load code, the cable dome structure is subjected to dead load, live load, snow load and wind load. The above loads are combined according to the code requirements and applied to the cable dome structure to control the node displacement and the span-rise ratio after deformation. If the relevant code requirements are not met, the initial prestress of the cable assembly is increased, or the height of the strut assembly is adjusted. The iteration is repeated until the code requirements are met.

[0044] S5. Adjust and optimize parameters to meet specification requirements:

[0045] The structure is optimized using the cross-sectional diameter of the strut assembly or the total weight of the cable dome structure as the control parameter.

[0046] As can be seen from the technical solutions provided by the embodiments of the present invention described above, the embodiments provide an alternating composite cable dome structure and its implementation method. This cable dome structure can effectively resist unevenly distributed loads. The presence of both cables and horizontal struts in its superstructure constrains deformation of the upper cables under load, enhancing structural integrity. The struts, together with the ridge cables and diagonal cables, form a tetrahedron structure, enhancing the geometric stability of the cable dome structure. Furthermore, the overall structure features a small number of node components, facilitating installation and tensioning, reducing construction costs and resulting in excellent overall economic benefits.

[0047] Additional aspects and advantages of the present invention will be set forth in part in the following description, will become apparent from the following description, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0049] Figure 1 A three-dimensional view of an alternating composite cable dome structure provided by an embodiment of the present invention;

[0050] Figure 2 A schematic plan view of the initial geometric form of an alternating composite cable dome provided by an embodiment of the present invention;

[0051] Figure 3 A simplified diagram for calculating the initial geometric form of an alternating composite cable dome provided in an embodiment of the present invention;

[0052] Figure 4 A three-dimensional view of a structure of an alternating composite cable dome geometry provided by an embodiment of the present invention;

[0053] Figure 5 A structural plan view of an alternating composite cable dome geometric form provided in an embodiment of the present invention.

[0054] Reference numerals

[0055] 11. Center strut; 12. Double struts of equal height; 13. Single strut; 14. Double struts of unequal height; 21. Inner oblique cable; 22. First single oblique cable; 23. Double oblique cable; 24. Second single oblique cable; 31. Inner ridge cable; 32. First ridge cable; 33. Second ridge cable; 34. Third ridge cable; 41. First ring cable; 42. Second ring cable; 43. Third ring cable; 5. Externally tensioned oblique cable; 6. Horizontal compression rod; 7. Externally compressed rigid ring beam. DETAILED DESCRIPTION

[0056] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention.

[0057] It will be understood by those skilled in the art that, unless expressly stated otherwise, the singular forms "a", "an", "said" and "the" used herein may also include the plural forms. It should be further understood that the term "comprising" used in the description of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be intermediate elements. In addition, "connected" or "coupled" as used herein may include wireless connections or couplings. The term "and / or" used herein includes any unit and all combinations of one or more associated listed items.

[0058] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art in the art to which the present invention pertains. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art and, unless defined as such herein, will not be interpreted in an idealized or overly formal sense.

[0059] To facilitate understanding of the embodiments of the present invention, several specific embodiments will be further explained below with reference to the accompanying drawings, and each embodiment does not constitute a limitation on the embodiments of the present invention.

[0060] The embodiment of the present invention provides an alternating composite cable dome structure, such as Figure 1-5 As shown, the plane projection of the cable dome structure is a standard circle, which includes: support components, cable components and external pressure rigid ring beams.

[0061] The support assembly includes: a central strut 11, equal-height double struts 12, a single strut 13, unequal-height double struts 14 and a horizontal compression rod 6. The equal-height double struts 12, the single strut 13 and the unequal-height double struts 14 are arranged in sequence from the center of the cable dome to the outermost circle of the cable dome.

[0062] The cable assembly includes: a vertebral cable assembly, a hoop cable assembly, an oblique cable assembly, and an externally pulled oblique cable assembly. The vertebral cable assembly includes: an inner vertebral cable 31, a first vertebral cable 32, a second vertebral cable 33, and a third vertebral cable 34. There are six inner vertebral cables, whose upper endpoints intersect at a point and radiate. The first vertebral cable 32, the second vertebral cable 33, and the third vertebral cable 34 are in the shape of a broken line, each having a vertex and two endpoints. The projected lengths of the vertebral cable assembly on the horizontal plane are equal. The hoop cable assembly includes a first hoop cable 41, a second hoop cable 42, and a third hoop cable 43. The first hoop cable 41, the second hoop cable 42, and the third hoop cable 43 are all polygonal. The centers of the first hoop cable 41, the second hoop cable 42, and the third hoop cable 43 are located on the axis of the externally pressed rigid ring beam 7. The first hoop cable 41 is located below the center strut 11, the second hoop cable 42 is located below the first hoop cable 41, and the third hoop cable 43 is located below the second hoop cable 42. The inclined cable assembly includes an inner inclined cable 21, a first single inclined cable 22, a double inclined cable 23 and a second single inclined cable 24. There are 6 inner ridge cables, whose lower endpoints intersect at a point and are radial. The inner inclined cable 21, the first single inclined cable 22, the double inclined cable 23 and the second single inclined cable 24 are arranged in sequence from the center of the cable dome to the outermost circle of the cable dome in each frame. The double inclined cable 23 is a broken line with one vertex and two endpoints. The external inclined cable assembly includes an external inclined cable 5. The external inclined cable 5 is a broken line with one vertex and two endpoints.

[0063] The central strut 11 is vertically arranged above the axis of the external pressure rigid ring beam 7, with its upper end connected to the upper end of the six inner ridge cables 31, and its lower end connected to the lower end of the six inner oblique cables 21. The equal-height double struts 12, single struts 13 and unequal-height double struts 14 are arranged in each frame from the center of the cable dome to the outermost circle of the cable dome.

[0064] The upper end point of the equi-height double strut 12 is connected to the lower end point of the inner ridge cable 31, the upper end point of the first single oblique cable 22 and the upper end point of the inner oblique cable 21, and its lower apex is connected to the apex of the first hoop cable 41 and the lower end point of the first single oblique cable 22. The upper end points of adjacent equi-height double struts 12 are connected in the circumferential direction to form a closed strut ring, and the horizontal projection of the equi-height double strut 12 coincides with the first hoop cable 41.

[0065] The upper end point of the single support rod 13 is connected to the lower end point of the first chord cable 32, the upper vertex of the second chord cable 33 and the upper end point of the first single oblique cable 22, and its lower end point is connected to the vertex of the second ring cable 42, the lower vertex of the double oblique cable 23 and the lower vertex of the external pull oblique cable 5.

[0066] One upper end point of the unequal height double strut 14 is connected to the lower end point of the second chord 33, one upper end point of the third chord 34, the upper end point of the double oblique cable 23, and one end point of the horizontal pressure rod 6. The other upper end point of the unequal height double strut 14 is connected to the upper end point of the external pull oblique cable 5 and the other upper end point of the third chord 34. The lower apex of the unequal height double strut 14 is connected to the apex of the third ring cable 43 and the lower end point of the second single oblique cable 24. A horizontal pressure rod 5 is connected between every two adjacent unequal height double struts 14, and the horizontal pressure rod 5 is connected end to end with the unequal height double strut 14 to form a closed strut ring.

[0067] The lower end point of the inner notochord 31 is connected to the upper end point of the first notochord 32, the lower apex of the first notochord 32 is connected to the upper apex of the second notochord 33, the lower end point of the second notochord 33 is connected to the upper end point of the third notochord 34, and the lower apex of the third notochord 34 is connected to the external pressure rigid ring beam 7 and the upper end point of the second mono-oblique cable 24 at one point.

[0068] The upper end point of the external pull cable 5 is connected to the upper end point of the third chord 34, the lower end point of the second chord 33, and the upper vertex of the unequal height double strut 14, and its lower vertex is connected to the vertex of the second hoop cable 42, the lower end point of the single strut 13, and the lower vertex of the double oblique cable 23.

[0069] The first hoop 41 is connected to the lower vertex of the equal-height double strut 12 and the lower end point of the first single oblique cable 22 at each vertex; the second hoop 42 is connected to the lower end point of the single strut 13, the lower vertex of the external pull oblique cable 5 and the lower vertex of the double oblique cable 23 at each vertex; the third hoop 43 is connected to the lower vertex of the unequal-height double strut 14 and the lower end point of the second single oblique cable 24 at each vertex.

[0070] The lower endpoints of the six inner oblique cables 21 intersect and radiate, the lower endpoint of the inner oblique cable 21 is connected to the lower endpoint of the central strut 11, and its upper endpoint is connected to the upper endpoint of the equal-height double strut 12, the lower endpoint of the inner chord 31, and the upper endpoint of the first chord 32; the lower endpoint of the first single oblique cable 22 is connected to the apex of the first hoop cable 41 and the lower endpoint of the equal-height double strut 12, and its upper endpoint is connected to the upper endpoint of the single strut 13, the lower endpoint of the first chord 32, and the upper endpoint of the second chord 33; the lower endpoint of the double oblique cable 23 is connected to the apex of the second hoop cable 42 and the lower endpoint of the single strut 13, and its upper endpoint is connected to the upper endpoint of the unequal-height double strut 14 and the lower endpoint of the second chord 33; the lower endpoint of the second single oblique cable 24 is connected to the apex of the third hoop cable 43 and the lower endpoint of the unequal-height double strut 14, and its upper endpoint is connected to the external pressure rigid ring beam 7 and the lower endpoint of the third chord 34.

[0071] The present invention also provides a method for implementing an alternating composite cable dome structure, comprising the following steps:

[0072] S1. First, determine the span and rise-to-span ratio of the cable dome structure, and determine the connection method between the outermost node of the cable dome structure and the external pressure rigid ring beam;

[0073] The appropriate cable dome span is selected based on design requirements and practical conditions. The cable dome's rise is also preliminarily determined based on relevant cable specifications. Because the prestressed cable dome structure exerts considerable tension on the surrounding rigid ring beam, a relatively large cross-section is necessary. A hinged joint is used at the connection between the externally compressed rigid ring beam and the cable dome to facilitate deformation of the cable dome structure after prestressing.

[0074] S2. Calculate the internal forces of the structure using the node equilibrium method and the displacement method;

[0075] The cable dome structure is symmetrical along the center line of each frame, and also along the line where the ridge cable in the innermost circle is located. Therefore, the cable dome structure can be simplified, such as Figure 3 As shown, this facilitates subsequent theoretical analysis. Assuming the internal force of the central strut is V0, and the number of unknown force cables connected to the upper and lower ends of the central strut exceeds two, the nodal equilibrium method can be used to determine the internal forces of each cable. Similarly, the internal forces of the equal-height double struts and the oblique cables connected to the first hoop cable can be determined, as can the internal forces of the single strut and the ridge cable. Because the oblique cables connected to the second hoop cable are connected to the upper endpoints of the unequal-height double struts, the oblique cables are no longer symmetrical, resulting in three unknown forces in the members connected to the second hoop cable. The nodal equilibrium method is no longer applicable, so the displacement method is introduced. The oblique cables, hoop cables, and single strut connected to the second hoop cable are considered a single unit and converge at a point. The internal forces of the single strut are applied as known external forces at the node of this unit. Since the cable dome possesses sufficient stiffness after prestressing, it can be assumed that the nodes connecting the distal ends of the oblique cables and hoop cables will not displace due to external forces; that is, the distal nodes are considered hinged. If the unit stiffness of the oblique and hoop cables is known, the unit stiffness can be calculated based on the unit stiffness of each cable. Since the internal force of the single strut connected to the second hoop cable is known, when a known force acts on a unit node with known unit stiffness, the displacement of the unit under the action of the external force can be calculated. The cables in the unit intersect at a point, so the displacement of the unit node is also the displacement of the connecting end points of the oblique and hoop cables. When both the displacement and the unit stiffness are known, the internal forces of the hoop and oblique cables can be calculated. Similarly, the internal forces of the oblique cables connected to the third hoop cable, the hoop cables, the unequal-height double struts, and the ridge cable can be calculated.

[0076] S3. Preliminarily determine the size of the components and the size of the prestress on the hoop cable;

[0077] The internal forces of each cable-strut calculated in step S2 are amplified to a level that allows the structure to withstand the loads and deformation requirements specified in the code. These forces are then applied to the cable dome structure, ensuring that the displacement of the deformed cable-dome structure is within the code-specified range. Based on the internal forces of the deformed cables, appropriate cable and rod cross-sectional dimensions are selected. The initial prestress of the cable assembly should not exceed 0.45 times the ultimate breaking strength, and the axial compression ratio of the strut assembly should be kept within a reasonable range.

[0078] S4. Conduct ultimate bearing capacity analysis, limit state analysis of normal use and other necessary analyses of the structure;

[0079] After steps S1, S2, and S3, the cable dome structure has sufficient rigidity and bearing capacity. Dead loads, live loads, snow loads, and wind loads are then applied to the cable dome in accordance with building structure load specifications. These loads are then combined and applied to the cable dome according to the specifications. The node displacements and the span-rise ratio after deformation are controlled. If these do not meet the relevant specifications, the initial prestress of the cable components is increased or the height of the strut components is adjusted. This process is repeated until the specifications are met.

[0080] S5. Adjust and optimize parameters to meet the specification requirements.

[0081] In order to make the cable dome structure more economical, the structure can be optimized by taking the cross-sectional diameter of the strut assembly or the total weight of the structure as the control parameter without affecting the bearing capacity of the cable dome.

[0082] In summary, the embodiments of the present invention provide an alternating composite cable dome structure. The cable dome structure's planar projection forms a standard circle. The supporting components are compression rods, the horizontal compression rods are compression rods, and the remaining components are tension cables. The cable dome's innermost ring is closed in the circumferential direction with equal-height double struts, providing the inner ring with sufficient bearing capacity and preventing collapse under load. The upper components of the cable dome structure contain both cables and steel pipes, a feature not found in other cable dome structures. The horizontal compression rods and the unequal-height double struts together form a closed strut circle. Compared to traditional cable domes, this circumferential continuity further enhances the cable dome's ability to withstand unevenly distributed loads. Furthermore, the horizontal compression rods provided between the upper cables constrain deformation of the upper cables under load, improving the structural integrity. The struts, together with the ridge cables and oblique cables, form a tetrahedron structure, enhancing the geometric stability of the cable dome structure. The number of equal-height double braces and the first mono-oblique cable connected to a node of the first hoop cable is only three, and the number of unequal-height double braces and the second mono-oblique cable connected to a node of the third hoop cable is also only three. This small number of components facilitates installation and tensioning, reduces construction costs, and achieves excellent overall economic benefits. The present invention also provides a simple and easy-to-implement method for implementing an alternating composite cable dome structure, utilizing a node balance method and a displacement method to analyze the internal forces of the structure.

[0083] Those skilled in the art will appreciate that the accompanying drawings are merely schematic diagrams of an embodiment, and the modules or processes in the accompanying drawings are not necessarily required to implement the present invention.

[0084] Each embodiment in this specification is described in a progressive manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments. In particular, for the device or system embodiments, since they are basically similar to the method embodiments, the description is relatively simple. For the relevant parts, refer to the partial description of the method embodiments. The device and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. A person of ordinary skill in the art can understand and implement it without making any creative efforts.

[0085] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An alternating composite cable dome structure, characterized in that: include: Support assembly, cable assembly and external pressure rigid ring beam; The support assembly includes: a central support rod, double support rods of equal height, a single support rod, double support rods of unequal height and a horizontal pressure rod, wherein the double support rods of equal height, the single support rod and the double support rods of unequal height are arranged in sequence from the center of the cable dome to the outermost circle of the cable dome in each frame; The cable assembly includes: a ridge cable assembly, a ring cable assembly, an oblique cable assembly and an outer pull oblique cable assembly, and the oblique cable assemblies are arranged in sequence from the center of the cable dome to the outermost circle of the cable dome in each frame; The loop cable assembly comprises a first loop cable, a second loop cable and a third loop cable, wherein the centers of the first loop cable, the second loop cable and the third loop cable are located on the axis of the external pressure rigid ring beam, the first loop cable is located below the central strut, the second loop cable is located below the first loop cable, and the third loop cable is located below the second loop cable; The central support rod is vertically arranged above the axis of the external pressure rigid ring beam, and its upper end is connected to the ridge cable assembly, and its lower end is connected to the oblique cable assembly; The upper end points of the equal-height double braces, the single brace, and the unequal-height double braces are all connected to the ridge cable assembly and the oblique cable assembly; The lower end points of the equal-height double braces, the single brace, and the unequal-height double braces are all connected to the oblique cable assembly and the ring cable assembly; The adjacent double braces of equal height are connected at the upper end points of the ring to form a closed brace ring; The unequal height double struts and the horizontal pressure rod are connected end to end to form a closed strut ring; The external pressure rigid ring beam is connected to the outermost circle oblique cable assembly and the outermost circle ridge cable assembly; The notochord assembly comprises: an inner notochord, a first notochord, a second notochord and a third notochord; The oblique cable assembly includes an inner oblique cable, a first single oblique cable, a double oblique cable, and a second single oblique cable, wherein the inner oblique cable, the first single oblique cable, the double oblique cable, and the second single oblique cable are arranged in sequence from the center of the dome to the outside to press the rigid ring beam; The external pull-in inclined cable assembly comprises: an external pull-in inclined cable; The upper end point of the external pull cable is connected to the upper end point of the third ridge cable and the upper end point of the unequal height double strut, and the lower end point is connected to the lower end point of the second hoop cable, the double oblique cable and the lower end point of the single strut; The upper end points of the inner notochord intersect at one point and are radially arranged, the upper end point of the inner notochord is also connected to the upper end point of the central strut, and the lower end point is connected to the upper end point of the first notochord; The lower endpoint of the first notochord is connected to the upper endpoint of the second notochord; The lower end point of the second notochord is connected to the upper end point of the third notochord; The lower end point of the third notochord is connected to the external pressure rigid ring beam; The first loop rope, the second loop rope and the third loop rope are all polygonal; Each vertex of the first hoop cable is connected to the lower end point of the equal-height double strut and the lower end point of the first mono-oblique cable; Each vertex of the second hoop cable is connected to the lower end point of the single support rod, the lower end point of the external inclined cable and the lower end point of the double inclined cable; Each vertex of the third hoop cable is connected to the lower end point of the unequal height double brace and the lower end point of the second single oblique cable; The lower end points of the inner oblique cables intersect and radiate, the lower end points of the inner oblique cables are also connected to the lower end points of the central struts, and the upper end points are connected to the upper end points of the equal height double struts, the lower end points of the inner cords, and the upper end points of the first cords; The lower end point of the first mono-oblique cable is connected to the vertex of the first hoop cable and the lower end point of the equal-height double strut, and the upper end point of the first mono-oblique cable is connected to the upper end point of the single strut, the lower end point of the first notochord, and the upper end point of the second notochord; The lower end point of the double oblique cable is connected to the apex of the second hoop cable and the lower end point of the single strut, and the upper end point is connected to the upper end point of the unequal height double strut and the lower end point of the second chord cable; The lower end point of the second mono-oblique cable is connected to the apex of the third hoop cable and the lower end point of the unequal height double struts, and the upper end point is connected to the external pressure rigid ring beam and the lower end point of the third ridge cable; The plane projection of the cable dome structure is a standard circle.

2. The structure according to claim 1, characterized in that: The horizontal projection of the equal-height double struts coincides with the first hoop.

3. A method for implementing the alternating composite cable dome structure according to claim 1 or 2, characterized in that: The following steps are involved: S1. Determine the span and span-rise ratio of the cable dome structure, and determine the connection method between the outermost circle node of the cable dome structure and the external pressure rigid ring beam, including: The span of the cable dome structure is selected according to the design requirements and actual conditions. The rise of the cable dome is initially selected according to the relevant specifications of the cable. The connection between the external pressure rigid ring beam and the cable dome is hinged. S2. Calculate the internal forces of the cable dome structure using the node balance method and displacement method, including: The cable dome structure is symmetrical along the center line of each frame, and also along the line where the innermost circle of the ridge cable is located. Assuming that the internal force of the central support rod is , the number of unknown force cables connected to the upper and lower ends of the central strut is more than 2, and the internal force of each cable is obtained by using the node balance method. Similarly, the internal force of the equal-height double struts and the oblique cable connected to the first ring cable can be obtained. Similarly, the internal force of the single strut and the ridge cable can also be obtained. The oblique cable, hoop cable and single strut connected to the second hoop cable are regarded as a unit and intersect at one point. The internal force of the single strut is applied to the node of the unit as a known external force. It is assumed that the node connected to the far end of the oblique cable and hoop cable will not be displaced due to the external force, that is, the far end node is regarded as hinged; the unit stiffness of the oblique cable and hoop cable is known, and the unit stiffness is obtained according to the unit stiffness of the oblique cable, hoop cable, ridge cable and single strut connected to the unit; the internal force of the single strut connected to the second hoop cable is known. When a known force acts on the unit node with known unit stiffness, the displacement of the unit under the action of external force can be obtained; the cables in the unit intersect at one point, and the displacement of the unit node is also the displacement of the connection end point of the oblique cable and hoop cable; when the displacement and unit stiffness are known, the internal forces of the hoop cable and the oblique cable can be obtained; Similarly, the internal forces of the oblique cable, the hoop cable, the double braces of different heights and the chord cable connected to the third hoop cable can be obtained; S3. Preliminary determination of component size and prestress on the hoop cable: The internal forces of the cables and rods calculated by S2 are magnified to enable the structure to withstand the loads and deformation requirements specified in the code, and then applied to the cable dome structure to control the displacement of the deformed cable dome structure within the range specified in the code. The cross-sectional dimensions of the cables and rods are selected based on the internal forces of the cables and rods after deformation; S4. Conduct ultimate bearing capacity analysis, limit state analysis of normal use and other necessary analysis of the structure; After S1-S3, the cable dome structure has sufficient rigidity and bearing capacity. According to the building structure load code, the cable dome structure is subjected to dead load, live load, snow load and wind load. The above loads are combined according to the code requirements and applied to the cable dome structure to control the node displacement and the span-rise ratio after deformation. If the relevant code is not met, the initial prestress of the cable assembly is increased, or the height of the strut assembly is adjusted, and the iteration is repeated until the code requirements are met; S5. Adjust and optimize parameters to meet regulatory requirements: The structure is optimized by taking the cross-sectional diameter of the strut assembly or the total weight of the cable dome structure as the control parameter.

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