A large-span double-roof composite reticulated shell system with a circular inner opening and three outer trimmed edges and its application

Abstract

The present invention discloses a large-span double-roof laminated reticulated shell system with a circular inner opening and its application, which includes a central support framework composed of a high-roof reticulated shell and a low-roof reticulated shell superposed relative to each other, connecting web members between the high and low roof reticulated shells, and a notch closing truss; both the high and low roof reticulated shells are triangular reticulated shells formed by radially landing arc trusses arranged by rotational replication and connected by circumferential trusses and then externally three-edge cut, with a circular opening in the center; the connecting web members between the high and low roof reticulated shells are located in the plane coincidence area of the high and low roof reticulated shells and are used to connect the high roof reticulated shell and the low roof reticulated shell; the notch closing truss is used to enclose and connect the notch where the externally three-edge cuts of the high roof reticulated shell and the low roof reticulated shell in the central support framework meet. Based on the superposed integral force-bearing mode of the high and low roof reticulated shells and through the enclosing connection of the notch closing truss, the components of the module are clear, the structure is reasonable, the force transmission is clear, and it has the characteristics of high overall stiffness and high bearing capacity, and has a wide range of applications.

Description

Technical Field

[0001] The present invention belongs to the technical field of structural engineering, and particularly relates to a large-span outer triple-edge double-layer composite reticulated shell system with a circular inner opening. The large span means that the span is not less than 60 meters. Background Art

[0002] The space pipe truss system is a new type of large-span space truss structure composed of larger-section through main pipes and multiple smaller-section branch pipes that are intersecting-welded with and regularly arranged with them. Due to its light system, reasonable force, large stiffness, and beautiful appearance, it is mainly applied to the roof structure systems of large-span space buildings such as stadiums, airport terminals, and exhibition halls.

[0003] The floor-supported arc-shaped space pipe truss system is an important type of large-span space structure form. Due to the need for the architectural appearance, the building roof and side walls often involve many curved boundaries. This type of system forms a unified pipe truss structure form of the roof and side walls by extending the roof pipe truss to the ground in a curve and fixing the supports. Based on the overall system force performance mode, it can span a very large space span under the premise of a relatively small self-weight, and at the same time bring better room for the setting of the building internal space.

[0004] When the space span is large, the single-layer reticulated shell system composed of pipe trusses will have a very large storey height and very large-sized components, which not only makes it difficult for the structural system stiffness and deformation deflection to meet the code requirements, but also brings great difficulties to the construction hoisting and welding operations. And due to the dense components and large weight of the multi-layer reticulated shell system, problems such as large space occupation of the reticulated shell structure, complex joints, and poor building light transmittance occur, so its application is also greatly restricted. Therefore, a reasonable and effective reticulated shell system design scheme is an important factor to ensure its bearing performance and implementation feasibility.

[0005] In the floor-supported arc-shaped pipe truss system, the design scheme of the double-layer composite reticulated shell system can better solve many defects existing in the above-mentioned single-layer reticulated shell system and multi-layer reticulated shell system of pipe trusses. This system forms an overall force system through the local web members in the overlapping area of two single-layer reticulated shell systems, and the non-overlapping areas are still single-layer reticulated shell systems respectively, having the advantages of light weight, large span, and large stiffness.

[0006] In addition, when the double-layer composite reticulated shell system involves complex building functions such as large span, large overhang, and large opening at the same time, problems such as more intersecting members, complex component assembly, complex system force performance, and node strengthening treatment will exist in the structural system. A reasonable and effective form design and assembly scheme of the composite reticulated shell system is also an important factor to ensure its bearing performance.

[0007] In summary, it is very necessary to study the form and design method of a large-span double-layer composite reticulated shell system with a circular inner opening and three-edge cutting on the outside to be applicable to the roof structure system and load-bearing of large-span complex space buildings with a circular open-air opening inside. Summary of the Invention

[0008] The purpose of the present invention is to provide a large-span double-layer composite reticulated shell system with a circular inner opening and three-edge cutting on the outside, which can realize the design and load-bearing of the roof structure system of large-span complex space buildings with a circular open-air opening inside.

[0009] The component modules of this structure system are clear, the force transmission is clear, effectively conforming to the design principle of the overall force and load-bearing mode. While giving full play to the relatively large stiffness and light self-weight of the overall structure system, based on the scheme of double-layer reticulated shell superposition of high and low roofs generated by rotating the floor arc pipe truss and performing outer edge cutting and inner circle opening treatment, it realizes the large-span (span not less than 60 meters), large overhang (overhang not less than 20 meters), and large opening (opening not less than 20 meters) of the large-span space building shape and function.

[0010] The design idea of the present invention is based on the effective combination of the high and low roof double-layer composite reticulated shell with an inner circle opening and three-edge cutting on the outside and the overall force mode:

[0011] First, taking the radially arranged floor arc space pipe truss as the basic unit, through central rotation replication and mutual connection to form multiple pipe trusses, constituting a single-layer reticulated shell system of high and low roofs that meets the needs of the building appearance. Secondly, through the inner circle opening and three-edge cutting methods, the boundaries of the single-layer reticulated shell system of high and low roofs are processed, and they are superposed and assembled according to certain rules to be effectively combined into a double-layer composite reticulated shell system of the overall force mode. Finally, through non-linear stability limit performance analysis, and controlling the system deformation, member stress, etc., to ensure the overall force and load-bearing performance of the structure system and avoid instability failure.

[0012] To achieve the above object and other related objects, the technical solution adopted by the present invention is:

[0013] A large-span double-layer composite reticulated shell system with a circular inner opening and three-edge cutting on the outside, including a central support frame composed of a superposed high roof reticulated shell and a low roof reticulated shell, high and low roof reticulated shell connecting web members, and a notch closing truss;

[0014] The high roof reticulated shell and the low roof reticulated shell are both triangular reticulated shells. The triangular reticulated shell is obtained by rotating and replicating the radially arranged floor arc pipe truss, connecting the ring pipe truss, and then performing three-edge cutting on the outside, with a circular opening in the center. The high and low roof reticulated shell connecting web members are located in the plane coincidence area of the high and low roof reticulated shells, and are used to connect the high roof reticulated shell and the low roof reticulated shell. The notch closing truss is used to close and connect the notch where the outer three-edge cutting intersections of the high roof reticulated shell and the low roof reticulated shell in the central support frame.

[0015] Further, the radial floor arc pipe truss is rotationally replicated at intervals of 3° to 8° based on the central positioning point to generate a radial floor arc pipe truss assembly. The radial floor arc pipe trusses of each high reticulated shell and low reticulated shell are correspondingly located at the same radial position; the radial floor arc pipe trusses are connected by intersecting ring pipe trusses respectively, and grids are formed between the ring pipe trusses, and the distance of the grids is 3m to 6m.

[0016] Further, the triangular reticulated shell is respectively externally three-edge cut by using equilateral triangle and inverted triangle side lines. The plane coincidence area of the central support framework is only between the externally three-edge cut and the inner circle of the triangular reticulated shell, and the shortest distance is not less than 4 grids. Externally cut edge arc pipe trusses are arranged on the 3 externally cut edges of the triangular reticulated shell, and it is in the form of two-end floor support.

[0017] Further, 6 radial horizontal supports and 2 circumferential horizontal supports are also arranged on the triangular reticulated shell; the radial horizontal supports are composed of chord layer inner diagonal bracing rods connecting the same chord rod layer of two radial pipe trusses, and one is formed by extending from the inner circle boundary to the floor, and the 6 radial horizontal supports are respectively arranged on both sides of the floor end of the triangular reticulated shell; the circumferential horizontal supports are composed of chord layer inner diagonal bracing rods connecting the same chord rod layer of two circumferential pipe trusses, and the 2 circumferential horizontal supports are respectively arranged at the inner circle boundary and the corner of the outer circle arc pipe truss.

[0018] Further, the coincidence area and non-coincidence area of the double-layer laminated reticulated shell system are respectively in the form of a three-layer reticulated shell and a single-layer reticulated shell; the thickness of the three-layer reticulated shell is 1 / 12 - 1 / 20 of the span, and the corresponding thickness of the single-layer reticulated shell is 1 / 36 to 1 / 60 of the span.

[0019] Further, the cross-section of the triangular reticulated shell member is a circular pipe, and the joint form is intersecting connection; the main pipe and branch pipe sizes of the floor arc pipe truss are 400mm to 700mm and 100mm to 400mm respectively; when the connection strength of the intersecting joint is insufficient, diaphragms are added for joint strengthening.

[0020] Further, the notch-closed truss is located at six notches where the outer three-edge cuts of the high and low reticulated shells meet, and is composed of an orthogonal arrangement of a radial plane truss and a circumferential plane truss to form a two-way truss system; among them, at one end close to the high reticulated shell, the notch-closed truss extends 3m - 10m inside the externally cut edge, and an arc boundary plane truss is arranged at the end. The plane position of the arc boundary plane truss is parallel to the plane position of the externally cut edge arc pipe truss, and the arc boundary plane truss is directly connected to the lower chord of the high roof reticulated shell or is suspended and connected through a connecting web member; at one end close to the low reticulated shell, the circumferential plane truss is located between the upper chord and the lower chord of the radial pipe truss of the low roof reticulated shell and is connected to the externally cut edge arc pipe truss by intersection.

[0021] Furthermore, the spacing of the radial plane trusses is 10 m to 15 m, and the spacing of the circumferential plane trusses is the same as that of the circumferential pipe trusses of the latticed shell to meet the functional requirements of the building entrance in the large space at the bottom; the spacing of the circumferential plane trusses is 3 m - 6 m, and the relative arrangement is denser to increase the overall stiffness of the two-way truss system.

[0022] Furthermore, it also includes a steel support cylinder located in the plane coincidence area at the intersection of the three trimmed edges outside the high and low latticed shells. The steel support cylinder is located at the four southern and northern positions where the three trimmed edges outside the high and low latticed shells meet. The steel support cylinder is composed of steel support cylinder vertical columns, steel support cylinder horizontal beams, and steel support cylinder diagonal web members, and its structural form is a center-supported steel frame structure; the upper end of the steel support cylinder serves as a spherical hinge support for the corresponding position nodes of the lower chord layer of the low-roof latticed shell for vertical support; to meet the seismic requirements, the support form is a seismic spherical support, disconnecting the upper steel roof structure from the lower steel support cylinder. Furthermore, the setting of the steel support cylinder is an optional solution; when the building span is not large and the overall stiffness of the double-layer composite latticed shell system is sufficient, the steel support cylinder may not be set, that is, the vertical internal support is not considered. When the building span is large and the overall stiffness is weak, the steel support cylinder can be used as the vertical support structure of the double-layer composite latticed shell system and also as the building elevator and stairwell leading to the sightseeing corridor function.

[0023] Furthermore, the inner circle opening size and the positions of the three trimmed edges outside of the double-layer composite latticed shell system can be appropriately adjusted according to the architectural styling requirements. Among them, the three trimmed edges of the high-roof latticed shell and the low-roof latticed shell can also be in the forms of a regular isosceles triangle and an inverted isosceles triangle respectively, without affecting the component composition and assembly method of the double-layer composite latticed shell system of the present invention.

[0024] The present invention also provides an application of a large-span double-roof composite latticed shell system with a circular inner opening in the roof structure system design and load-bearing of a large-span complex space building with an internal circular open-air opening, and the large-span complex space building is a large-space public civil building with a span of not less than 60 meters and meeting special architectural functions and special curved curtain wall styling.

[0025] Through the above technical solutions, the present invention has the following beneficial effects:

[0026] The large-span outer triple-edge double-roof laminated reticulated shell system with a circular inner opening provided by the present invention has a reasonable structural system, which can realize the design and load-bearing of the roof structure system of a large-span complex space building with a circular open-air inner opening, and give full play to the advantages of high overall stiffness and high load-bearing performance of the double-layer laminated reticulated shell system. The structural system takes the radially arranged floor-standing arc-shaped space pipe truss as the basic unit, and is formed by central rotation replication and mutual connection to form high and low roof reticulated shells that meet the requirements of the building appearance; based on the overall stress mode of the superposition of high and low roof reticulated shells with different outer-edge and inner-circle opening boundary treatments, it can achieve a large spatial span while minimizing its own weight. Based on the performance analysis of the non-linear stable ultimate bearing capacity, the structure of the present invention is convenient to control through indexes such as the overall stiffness (deformation value control) and bearing capacity (stress ratio control) to further ensure the rationality and effectiveness of the overall structural system. The component modules of the structural system are clear, the force transmission is clear, the overall system has a large stiffness and a high bearing capacity, and it has broad application prospects in the roof structure system of large-span complex space buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Through the following detailed description in conjunction with the accompanying drawings, the above advantages of the present invention will become clearer and easier to understand. These drawings are only schematic and do not limit the present invention, where:

[0028] Figure 1a - 1d They are respectively the structural schematic diagram, the high-roof reticulated shell schematic diagram, the low-roof reticulated shell schematic diagram, and the connecting web member schematic diagram of the high and low roof reticulated shells of the embodiment of the outer triple-edge double-roof laminated reticulated shell system with a circular inner opening of the present invention.

[0029] Figure 1e 、 1f They are respectively the schematic diagram of the notch-closed truss and the schematic diagram of the steel support cylinder.

[0030] Figure 2 It is the top plan view of the embodiment of the double-roof laminated reticulated shell system of the present invention, that is, the schematic diagram of the A-A section in FIG. 1;

[0031] Figure 3 It is the sectional side view of the embodiment of the double-roof laminated reticulated shell system of the present invention, that is, the schematic diagram of the B-B section in FIG. 1;

[0032] Figure 4a - 4d They are respectively Figure 2 The top plan development views of the upper chord layer of the high roof reticulated shell, the lower chord layer of the high roof reticulated shell, the upper chord layer of the low roof reticulated shell, and the lower chord layer of the low roof reticulated shell;

[0033] Figure 5 It is Figure 2 The C-C sectional view of a single radial floor-standing arc-shaped pipe truss;

[0034] Figure 6Yes Figure 2 Cross-sectional view D-D of a single-plane radial floor-supported curved pipe truss

[0035] Figure 7 Yes Figure 2 Cross-sectional view E-E of the circumscribed-edge curved pipe truss of the high roof reticulated shell

[0036] Figure 8 Yes Figure 2 Cross-sectional view F-F of the circumscribed-edge curved pipe truss of the low roof reticulated shell

[0037] Figure 9a - 9c Respectively Figure 2 Structural schematic diagram of the notched closed truss at the southwest corner, cross-sectional view G-G of the radial plane truss, cross-sectional view H-H of the circumferential plane truss

[0038] Figure 10a - 10c Respectively Figure 2 Structural schematic diagram of the steel support cylinder at the southeast corner, cross-sectional view J-J, cross-sectional view K-K

[0039] Figure 11 It is the component assembly flow chart of the double-roof composite reticulated shell system embodiment, and the numbers in the figure are component labels

[0040] In the attached drawings, the components represented by each label are as follows

[0041] 1. Upper chord of the radial pipe truss of the high reticulated shell; 2. Web member of the radial pipe truss of the high reticulated shell; 3. Lower chord of the radial pipe truss of the high reticulated shell; 4. Upper chord of the circumferential truss of the high reticulated shell; 5. Web member of the circumferential truss of the high reticulated shell; 6. Lower chord of the circumferential truss of the high reticulated shell; 7. Radial horizontal support on the upper chord layer of the high reticulated shell; 8. Radial horizontal support on the lower chord layer of the high reticulated shell; 9. Circumferential horizontal support on the upper chord layer of the outer ring of the high reticulated shell; 10. Circumferential horizontal support on the lower chord layer of the outer ring of the high reticulated shell; 11. Circumferential horizontal support on the upper chord layer of the inner ring of the high reticulated shell; 12. Circumferential horizontal support on the lower chord layer of the inner ring of the high reticulated shell; 13. Upper chord of the radial pipe truss of the low reticulated shell; 14. Web member of the radial pipe truss of the low reticulated shell; 15. Lower chord of the radial pipe truss of the low reticulated shell; 16. Upper chord of the circumferential truss of the low reticulated shell; 17. Web member of the circumferential truss of the low reticulated shell; 18. Lower chord of the circumferential truss of the low reticulated shell; 19. Radial horizontal support on the upper chord layer of the low reticulated shell; 20. Radial horizontal support on the lower chord layer of the low reticulated shell; 21. Circumferential horizontal support on the upper chord layer of the outer ring of the low reticulated shell; 22. Circumferential horizontal support on the lower chord layer of the outer ring of the low reticulated shell; 23. Circumferential horizontal support on the upper chord layer of the inner ring of the low reticulated shell; 24. Circumferential horizontal support on the lower chord layer of the inner ring of the low reticulated shell; 25. Radial connecting web member between the high and low reticulated shells; 26. Circumferential connecting web member between the high and low reticulated shells; 27. Upper chord of the radial truss of the notch-closed truss; 28. Web member of the radial truss of the notch-closed truss; 29. Lower chord of the radial truss of the notch-closed truss; 30. Upper chord of the circumferential truss of the notch-closed truss; 31. Web member of the circumferential truss of the notch-closed truss; 32. Lower chord of the circumferential truss of the notch-closed truss; 33. Upper chord of the arc boundary truss of the notch-closed truss; 34. Web member of the arc boundary truss of the notch-closed truss; 35. Lower chord of the arc boundary truss of the notch-closed truss; 36. Web member connecting the notch-closed truss and the boundary of the high reticulated shell; 37. Upper chord of the outer tangent edge truss of the high reticulated shell; 38. Web member of the outer tangent edge truss of the high reticulated shell; 39. Lower chord of the outer tangent edge truss of the high reticulated shell; 40. Upper chord of the outer tangent edge truss of the low reticulated shell; 41. Web member of the outer tangent edge truss of the low reticulated shell; 42. Lower chord of the outer tangent edge truss of the low reticulated shell; 43. Vertical frame column of the steel support cylinder; 44. Horizontal beam of the steel support cylinder; 45. Diagonal web member support of the steel support cylinder; 46. Top conversion support node of the steel support cylinder; 47. Central positioning point. Detailed implementation manners

[0042] The technical solution of a large-span outer three-cut-edge double-roof composite reticulated shell system with a circular inner opening according to the present invention will be described in detail below in conjunction with specific embodiments and drawings.

[0043] The embodiments described herein are specific and particular embodiments of the present invention, which are used to illustrate the concept of the present invention. They are all explanatory and exemplary, and should not be construed as limiting the embodiments of the present invention and the scope of the present invention. Except for the embodiments described herein, those skilled in the art can also adopt other obvious technical solutions based on the content disclosed in the claims and the specification of this application. These technical solutions include technical solutions that make any obvious substitutions and modifications to the embodiments described herein.

[0044] The drawings in this specification are schematic diagrams, which assist in illustrating the concept of the present invention and schematically represent the shapes and their mutual relationships of each part. Please note that in order to clearly show the structures of the components in the embodiments of the present invention, the drawings are not drawn in the same proportion. The same reference numerals are used to represent the same components.

[0045] As Figure 1a - 1f and Figure 2 、 3 shown, a large-span outer three-edge-cut double-roof laminated reticulated shell system with a circular inner opening of the present invention includes a high-roof reticulated shell, a low-roof reticulated shell, connecting web members between the high and low roof reticulated shells, and notch-closed trusses. The high-roof reticulated shell ( Figure 1b ) is located in the upper layer or the outer layer of the double-layer laminated reticulated shell system. It is based on a combination of several radial floor arc pipe trusses generated by central rotation and replication at a certain interval angle, and is formed into a triangular reticulated shell through circumferential pipe truss connection and outer three-edge-cut treatment. There is a circular opening in the center of the triangular reticulated shell; the low-roof reticulated shell ( Figure 1c ) is located in the lower layer or the inner layer of the double-layer laminated reticulated shell system. The component composition method is the same as that of the high-roof reticulated shell, and together with it, they are relatively laminated to form a central support framework; the connecting web members between the high and low roof reticulated shells ( Figure 1d ) are located in the plane coincidence area between the high and low roof reticulated shells and are used to connect the high-roof reticulated shell and the low-roof reticulated shell. The notch-closed trusses ( Figure 1e ) are located at six notch positions where the outer three-edge-cuts of the high and low roof reticulated shells meet, and are used to close and connect the notches where the outer three-edge-cuts of the high-roof reticulated shell and the low-roof reticulated shell meet in the central support framework.

[0046] The above-mentioned relative lamination means that the high-roof reticulated shell is located in the upper layer or the outer layer of the central support framework, and the low-roof reticulated shell is located in the lower layer or the inner layer of the central support framework. The triangular reticulated shell forming the low-roof reticulated shell is centrosymmetric with the triangular reticulated shell forming the high-roof reticulated shell.

[0047] Specifically, as Figure 1b 、 Figure 4a - 4bAs shown, the high - roof reticulated shell takes a single - bay radial - landing arc - shaped pipe truss composed of the upper chord 1 of the high - reticulated - shell radial pipe truss, the web member 2 of the high - reticulated - shell radial pipe truss, and the lower chord 3 of the high - reticulated - shell radial pipe truss as the basic unit of the high - roof reticulated shell; for the double - layer composite reticulated shell system with a circular inner opening, the basic unit of the high - roof reticulated shell takes the central positioning point 47 as the rotation center and is rotationally replicated at a certain interval angle to generate a combined body of high - roof reticulated - shell radial - landing arc - shaped pipe trusses. The interval angle is preferably 3° - 8°.

[0048] As Figure 1c , Figure 4c - 4d shown, the low - roof reticulated shell takes a single - bay radial - landing arc - shaped pipe truss composed of the upper chord 13 of the low - reticulated - shell radial pipe truss, the web member 14 of the low - reticulated - shell radial pipe truss, and the lower chord 15 of the low - reticulated - shell radial pipe truss as the basic unit of the low - roof reticulated shell; similarly, for the double - layer composite reticulated shell system with a circular inner opening, the basic unit of the low - roof reticulated shell also takes the central positioning point 47 as the rotation center, with the same interval angle as the high - roof reticulated shell, and is rotationally replicated to generate a combined body of low - roof reticulated - shell radial - landing arc - shaped pipe trusses. Each basic unit of the high - roof reticulated shell and the low - roof reticulated shell is in the same radial position.

[0049] In this embodiment, the interval angle is 4.5°, and there are a total of 80 single - bay radial - landing arc - shaped pipe trusses.

[0050] As Figure 1b - 1c shown, based on the combined body of high - roof reticulated - shell radial - landing arc - shaped pipe trusses of the high - roof reticulated shell, between each single - bay basic unit of the high - roof reticulated shell, the upper chord 4 of the high - roof reticulated - shell circumferential truss, the web member 5 of the high - roof reticulated - shell circumferential truss, and the lower chord 6 of the high - roof reticulated - shell circumferential truss are connected by intersecting to provide lateral support and form the overall load - bearing structure of the high - roof reticulated shell, that is, a triangular reticulated shell. There is a circular opening in the center of the triangular reticulated shell. Similarly, based on the combined body of low - roof reticulated - shell radial - landing arc - shaped pipe trusses of the low - roof reticulated shell, between each single - bay basic unit of the low - roof reticulated shell, the upper chord 16 of the low - roof reticulated - shell circumferential truss, the web member 17 of the low - roof reticulated - shell circumferential truss, and the lower chord 18 of the low - roof reticulated - shell circumferential truss are connected by intersecting to provide lateral support and form the overall load - bearing structure of the low - roof reticulated shell, that is, a triangular reticulated shell. Similarly, there is a circular opening in the center of the triangular reticulated shell. The distance between the circumferential pipe trusses forms a grid, and the distance of the grid is 3m - 6m.

[0051] The central support frame composed of the superposition of the high - roof reticulated shell and the low - roof reticulated shell, and the radial - landing arc - shaped pipe trusses of each high - roof reticulated shell and low - roof reticulated shell are correspondingly in the same radial position. As Figure 1b - 1c , Figure 2 shown, the high - roof reticulated shell and the low - roof reticulated shell are respectively processed by external three - tangent edges using the side lines of regular triangles and inverted triangles, so that the overlapping area of the high - roof reticulated shell and the low - roof reticulated shell is only limited near the inner ring. As a preferred solution, to improve the stiffness of the overall structural system, the shortest overlapping area distance from the center of each external tangent edge to the boundary of the inner - circle opening is not less than 4 grid sizes.

[0052] As Figure 1b 、 Figure 7 shown, the three circumscribed edges of the high roof reticulated shell are all set in the form of circumscribed edge arc pipe trusses for structural boundary support to increase the boundary stiffness of the overall structure; the circumscribed edge arc pipe truss of the high reticulated shell is in the form of two-end landing arc support and is composed of the upper chord rod 37 of the circumscribed edge truss of the high reticulated shell, the web member 38 of the circumscribed edge truss of the high reticulated shell, and the lower chord rod 39 of the circumscribed edge truss of the high reticulated shell.

[0053] As Figure 1c 、 Figure 8 shown, the three circumscribed edges of the low roof reticulated shell are all set in the form of circumscribed edge arc pipe trusses for structural boundary support; similarly, the circumscribed edge arc pipe truss of the low reticulated shell is in the form of two-end landing arc support and is composed of the upper chord rod 40 of the circumscribed edge truss of the low reticulated shell, the web member 41 of the circumscribed edge truss of the low reticulated shell, and the lower chord rod 42 of the circumscribed edge truss of the low reticulated shell.

[0054] As an optimal solution, the dimensions of the main pipes (37, 39, 40, 42) of the upper and lower chords and the branch pipes (38, 41) of the web members of the circumscribed edge arc pipe trusses of the high reticulated shell and the low reticulated shell are initially selected with reference to the dimensions of the main pipes (1, 3, 13, 15) of the upper and lower chords and the branch pipes (2, 14) of the web members of the radial landing arc pipe trusses of the high reticulated shell and the low reticulated shell, and are finally determined through subsequent force performance analysis.

[0055] As Figure 2 shown in

[0056] Figure 4, the high roof reticulated shell and the low roof reticulated shell are also respectively provided with 6 radial horizontal supports and 2 circumferential horizontal supports to respectively improve the torsional stiffness of the respective overall structural systems of the high roof reticulated shell and the low roof reticulated shell. The radial horizontal support is composed of chord layer diagonal braces connecting the same chord layers of two radial pipe trusses, and forms one through from the inner circle boundary to the landing point. The 6 radial horizontal supports are respectively arranged on both sides of the three landing ends of the high roof reticulated shell and the low roof reticulated shell; each horizontal support of the high reticulated shell is composed of the radial horizontal support 7 of the upper chord layer of the high reticulated shell and the radial horizontal support 8 of the lower chord layer of the high reticulated shell, and each horizontal support of the low reticulated shell is composed of the radial horizontal support 19 of the upper chord layer of the low reticulated shell and the radial horizontal support 20 of the lower chord layer of the low reticulated shell. Figure 2, as shown in Figure 4, the inner ring circumferential horizontal supports are located in the same plane position of the inner circle, including the high reticulated shell inner ring upper chord layer circumferential horizontal support 11, the high reticulated shell inner ring lower chord layer circumferential horizontal support 12 of the high roof reticulated shell, and the low reticulated shell inner ring upper chord layer circumferential horizontal support 23, the low reticulated shell inner ring lower chord layer circumferential horizontal support 24 of the low roof reticulated shell. The outer ring circumferential horizontal supports are respectively arranged at the 3 landing end arc-shaped corners of the high roof reticulated shell and the low roof reticulated shell, including the high reticulated shell outer ring upper chord layer circumferential horizontal support 9, the high reticulated shell outer ring lower chord layer circumferential horizontal support 10, the low reticulated shell outer ring upper chord layer circumferential horizontal support 21, and the low reticulated shell outer ring lower chord layer circumferential horizontal support 22.

[0057] As Figure 1a , 1d shown, the connecting web members of the high and low roof reticulated shells are located between the high roof reticulated shell and the low roof reticulated shell, and the plane position is the overlapping area between the outer three tangent edges and the inner circle opening ( Figure 2 ), as Figure 1e shown, the connecting web members of the high and low roof reticulated shells include vertical web members connecting the lower chord members of the high roof reticulated shell and the upper chord members of the low roof reticulated shell, and the radial connecting web members 25 and circumferential connecting web members 26 of the high and low reticulated shells for fixing the vertical web members. After the high and low roof reticulated shells are overlapped and connected into an integral system, the overlapping area shows a three-layer reticulated shell structure, and the non-overlapping area shows a single-layer reticulated shell structure.

[0058] After the high roof reticulated shell, the low roof reticulated shell, and the connecting web members of the high and low roof reticulated shells are assembled, the finally formed single-plane radial landing arc-shaped pipe truss basic unit is composed of seven components: the high reticulated shell radial pipe truss upper chord member 1, the high reticulated shell radial pipe truss web member 2, the high reticulated shell radial pipe truss lower chord member 3, the radial connecting web member 25 of the high and low reticulated shells, the low reticulated shell radial pipe truss upper chord member 13, the low reticulated shell radial pipe truss web member 14, and the low reticulated shell radial pipe truss lower chord member 15; it is divided into three structural composition forms: the high reticulated shell partial cutting type ( Figure 5 ), the low reticulated shell partial cutting type ( Figure 6 ), and the high and low reticulated shells simultaneous partial cutting type.

[0059] As a preferred solution, since the total thickness of the double-layer overlapping reticulated shell system actually corresponds to the height of the three-layer reticulated shell, including the height of the high roof reticulated shell, the connection height of the high and low roof reticulated shells, and the height of the low roof reticulated shell; the total thickness of the double-layer overlapping reticulated shell system is preferably 1 / 12 - 1 / 20 of the total span, and the thickness of each single-layer reticulated shell is preferably 1 / 36 - 1 / 60. The cross-sections of the components of the double-layer overlapping reticulated shell system are generally in the form of circular tubes, and the connection nodes correspond to the intersecting connection nodes; the main pipe sizes of the basic unit of the landing arc-shaped pipe truss are generally 400mm - 700mm, and the branch pipe sizes are generally 100mm - 400mm; the branch pipe sizes at the intersecting connection nodes are generally not larger than the main pipe sizes; when the connection strength of the intersecting nodes is insufficient, additional diaphragms and other methods are required to strengthen the nodes.

[0060] As Figure 5 , Figure 6 shown, as an alternative, for the connecting web members of the high and low roof reticulated shells, the radial connecting web members 25 of the high and low reticulated shells within the first grid of the inner circle opening boundary may not be provided for use as the function of the annular sightseeing corridor inside the building.

[0061] As Figure 1e , Figure 9 shown, the notch-closed truss is located at six notch positions where the outer three tangent edges of the high and low reticulated shells meet, and is composed of a radial plane truss, a circumferential plane truss, and an arc-boundary plane truss. Among them, the radial plane truss and the circumferential plane truss are orthogonally arranged to form an integral force-bearing system of the two-way truss. The radial plane truss is composed of a radial truss upper chord 27, a radial truss web member 28, and a radial truss lower chord 29. The circumferential plane truss is composed of a circumferential truss upper chord 30, a circumferential truss web member 31, and a circumferential truss lower chord 32. The arc-boundary plane truss is composed of an arc-boundary truss upper chord 33, an arc-boundary truss web member 34, and an arc-boundary truss lower chord 35.

[0062] As Figure 1a , 1e , Figure 9 shown, at each notch, the radial plane truss takes the central positioning point 47 as the rotation center and is rotationally replicated at a certain interval angle to generate a radial plane tubular truss combination. The structural form is a floor-standing arc-shaped tubular truss, and the interval angle is generally 3° - 8°; in this embodiment, the interval angle is 6.0°, and there are 4 bays of radial plane trusses in each notch. The circumferential plane truss is set corresponding to the grid spacing of the radial floor-standing arc-shaped tubular trusses of the high and low roof reticulated shells.

[0063] As Figure 1a , Figure 2 , Figure 9 shown, one end of the notch-closed truss close to the outer tangent-edge truss of the high roof reticulated shell is located inside the radial tubular truss lower chord 3 of the high roof reticulated shell, and is connected by extending a certain distance inside the outer tangent-edge truss of the high roof reticulated shell. The extending range is 3m - 10m; an arc-boundary plane truss is arranged at the boundary of one end of the notch-closed truss close to the outer tangent-edge truss of the high roof reticulated shell. The lower part of the arc-boundary plane truss is located on the same plane circular arc as the radial tubular truss lower chord 3 of the high roof reticulated shell and can be directly connected by intersecting connection; the upper part of the arc-boundary plane truss is parallel to the plane position of the outer tangent-edge arc-shaped tubular truss in terms of its plane position, and is in a disengaged state from the radial tubular truss lower chord 3, the circumferential truss lower chord 6, and the outer tangent-edge truss lower chord 36 of the high roof reticulated shell. A notch-closed truss and a high reticulated shell boundary connecting web member 36 are added for hanging intersecting welding connection.

[0064] As Figure 1a , Figure 2, as shown in Figure 9, one end of the notch-closed truss near the outer tangent truss of the low roof reticulated shell is located within the internal range between the upper chord 13 and the lower chord 15 of the radial pipe truss of the low roof reticulated shell. The ends of the radial plane truss and the circumferential plane truss can be directly connected by intersecting and welding with the upper chord 40, the web member 41, and the lower chord 42 of the outer tangent truss of the outer tangent arc pipe truss of the low roof reticulated shell.

[0065] As a preferred solution, the radial plane truss and the circumferential plane truss are orthogonally arranged to form a two-way truss system, which can bear lateral and vertical load effects simultaneously. Corresponding to the cross-sectional form of the main components of the double-layer composite reticulated shell system, the cross-section of the components of the notch-closed truss is generally also a circular pipe section. Due to the relatively dense arrangement, the component size is relatively small. The main pipe is generally 200mm - 400mm, and the branch pipe is generally 100mm - 200mm; the spacing of the floor radial plane truss is 10m - 15m to meet the functional requirements of the building entrance with a large space at the bottom; the spacing of the circumferential plane truss is 3m - 6m, which is relatively denser to increase the overall stiffness of the two-way truss system.

[0066] As Figure 1a , Figure 1f , as shown in Figure 10, the steel support cylinder is located in the plane coincidence area near the intersection of the outer three tangent trusses of the high and low reticulated shells. As shown in the figure, it can be divided into four plane orientations: southeast, southwest, northeast, and northwest; the steel support cylinder is composed of the vertical frame columns 43 of the steel support cylinder, the horizontal beams 44 of the steel support cylinder that horizontally connect the vertical frame columns 43 of the steel support cylinder, and the diagonal bracing 45 of the steel support cylinder that braces the intersection of the horizontal beams 44 of the steel support cylinder and the vertical frame columns 43 of the steel support cylinder. The structural form is a center-supported steel frame structure. The upper end of the steel support cylinder is provided with a spherical hinge support through the conversion support node 46 at the top of the steel support cylinder to vertically support the corresponding position node of the lower chord layer of the low roof reticulated shell, that is, the lower chord 15 of the low reticulated shell radial pipe truss; to meet the seismic requirements, the support form is a seismic spherical support, disconnecting the upper double-layer composite reticulated shell roof structure from the lower steel support cylinder.

[0067] As a preferred solution, when the building span is large and the overall stiffness is weak, the steel support cylinder can be used as the vertical support structure of the double-layer composite reticulated shell system and also as the building elevator and staircase shaft and lead to the sightseeing corridor function; but when the building span is not large and the overall stiffness of the double-layer composite reticulated shell system is sufficient, the steel support cylinder can also not be set, that is, the vertical internal support is not considered.

[0068] As a preferred solution, the inner circle opening size and the outer three tangent positions of the double-layer composite reticulated shell system can be appropriately adjusted according to the building shape requirements. Among them, the outer three tangent edges of the high roof reticulated shell and the low roof reticulated shell can also be in the form of a positive isosceles triangle and an inverted isosceles triangle respectively, which will not affect the component composition and assembly method of the double-layer composite reticulated shell system of the present invention.

[0069] As Figure 11 shown, the specific component assembly and welding process of the double-layer laminated reticulated shell system of the present invention is as follows:

[0070] (1) The upper chord member 1 of the radial pipe truss, the web member 2 of the radial pipe truss, and the lower chord member 3 of the radial pipe truss form the basic unit of the high reticulated shell floor arc pipe truss; the upper chord member 13 of the radial pipe truss, the web member 14 of the radial pipe truss, and the lower chord member 15 of the radial pipe truss form the basic unit of the low reticulated shell floor arc pipe truss;

[0071] (2) The upper chord member 37 of the circumscribed edge truss, the web member 38 of the circumscribed edge truss, and the lower chord member 39 of the circumscribed edge truss form the high reticulated shell circumscribed edge arc pipe truss; the upper chord member 40 of the circumscribed edge truss, the web member 41 of the circumscribed edge truss, and the lower chord member 42 of the circumscribed edge truss form the low reticulated shell circumscribed edge arc pipe truss;

[0072] (3) The high reticulated shell basic unit and the low reticulated shell basic unit formed in step (1) are both centered around the center positioning point 47 and rotated and replicated at the same interval angles to generate the high reticulated shell floor arc pipe truss combination body and the low reticulated shell floor arc pipe truss combination body respectively; between the basic units of each bay of the high reticulated shell and the low reticulated shell, the circumferential truss upper chord members (4, 16), the circumferential truss web members (5, 17), and the circumferential truss lower chord members (6, 18) are respectively connected to form the high reticulated shell overall structure and the low reticulated shell overall structure;

[0073] (4) The high reticulated shell overall structure and the low reticulated shell overall structure are respectively bounded by the high reticulated shell circumscribed edge arc pipe truss and the low reticulated shell circumscribed edge arc pipe truss formed in step (2) for structural boundary cutting treatment;

[0074] (5) On the basis of the high reticulated shell system and the low reticulated shell system after the circumscribed edge treatment in step (4), the former is provided with upper and lower chord layer radial horizontal supports (7, 8) and upper and lower chord layer circumferential horizontal supports (9, 10, 11, 12), and the latter is provided with upper and lower chord layer radial horizontal supports (19, 20) and upper and lower chord layer circumferential horizontal supports (21, 22, 23, 24) to improve the torsional stiffness of the overall structure;

[0075] (6) In the plane laminated area of the high reticulated shell system and the low reticulated shell system, the radial connecting web members (25) and the circumferential connecting web members (26) are connected to form the overall force-bearing system of the double-layer laminated reticulated shell;

[0076] (7) The upper chord member 27 of the radial truss, the web member 28 of the radial truss, and the lower chord member 29 of the radial truss are assembled into a radial plane truss, and the upper chord member 30 of the circumferential truss, the web member 31 of the circumferential truss, and the lower chord member 32 of the circumferential truss are assembled into a circular plane truss; the radial plane truss and the circular plane truss are orthogonally arranged and assembled into a notch-closed truss;

[0077] (8) At the end of the notched closed truss near the high reticulated shell, the arc boundary plane truss assembled by the upper chord member 33 of the arc boundary truss, the web member 34 of the arc boundary truss, and the lower chord member 35 of the arc boundary truss is directly connected or connected to the lower chord member 3 of the radial pipe truss of the high reticulated shell, the lower chord member 6 of the circumferential truss, and the lower chord member 36 of the outer tangent edge truss through the connecting web member 36. At the end of the notched closed truss near the low reticulated shell, it is directly connected to the upper chord member 40 of the outer tangent edge truss, the web member 41 of the outer tangent edge truss, and the lower chord member 42 of the outer tangent edge truss;

[0078] (9) The vertical frame column 43 of the steel support cylinder, the horizontal beam 44 of the steel support cylinder, and the inclined web member support 45 of the steel support cylinder are assembled into a steel support cylinder, and the upper end supports the double-layer laminated reticulated shell system through the top conversion support node 46 of the steel support cylinder.

[0079] The present invention also provides an application of a large-span outer three-cut-edge double-roof laminated reticulated shell system with a circular inner opening in the roof structure system design and load-bearing of a large-span complex space building with an internal circular open-air opening. The large-span complex space building is a large-space public civil building with a span of not less than 60 meters and meeting special building functions and special curved curtain wall shapes.

[0080] Compared with the deficiencies of the prior art, a large-span outer three-cut-edge double-roof laminated reticulated shell system provided by the present invention is based on the overall stress mode of the superposition of high and low roof reticulated shells with different outer three-cut-edge and inner circular opening boundary treatments. Through the enclosure of the notched closed truss and the vertical support of the steel support cylinder, it can span a very large space span on the premise of minimizing self-weight. The component modules of this structural system are clear, the force transmission is clear, and it effectively conforms to the design principles of the overall stress and load-bearing mode, and can realize the design and load-bearing of the roof structure system for complex large-span space building shapes and functions such as large span (span not less than 60 meters), large overhang (overhang not less than 20 meters), and large opening (opening not less than 20 meters). Based on the performance analysis of the nonlinear stable ultimate bearing capacity, through the overall performance control of the overall deformation stiffness, stress ratio bearing, and ultimate stability, the advantages of high overall stiffness and high load-bearing performance of the double-layer laminated reticulated shell system of the present invention can be further guaranteed.

[0081] The present invention is not limited to the above embodiments. Anyone can obtain other various forms of products under the inspiration of the present invention. However, no matter what changes are made in its shape or structure, as long as it has a technical solution identical or similar to the present application, it falls within the protection scope of the present invention.

Claims

1. A large-span external triple-edge double-roof laminated reticulated shell system with a circular inner opening, characterized in that, It includes a central support frame composed of a relatively superposed high roof reticulated shell and a low roof reticulated shell, connecting web members between the high and low roof reticulated shells, and a notch closing truss; among them, the relative superposition means that the high roof reticulated shell is located on the upper layer or outer layer of the central support frame, and the low roof reticulated shell is located on the lower layer or inner layer of the central support frame. The triangular reticulated shell forming the low roof reticulated shell and the triangular reticulated shell forming the high roof reticulated shell are centrally symmetric in shape. Both the high roof reticulated shell and the low roof reticulated shell are triangular reticulated shells. The triangular reticulated shell is obtained by externally trimming the reticulated shell formed by the radial floor arc trusses after rotational replication arrangement and connection by circumferential trusses; there is a circular opening in the center; the connecting web members between the high and low roof reticulated shells are located in the plane coincidence area of the high and low roof reticulated shells and are used to connect the high roof reticulated shell and the low roof reticulated shell; for the connecting web members between the high and low roof reticulated shells, the radial connecting web members of the high and low reticulated shells within the first grid of the inner circular opening boundary are not provided and are used as the function of the internal circular sightseeing corridor in the building. The notch closing truss is used to close and connect the notch where the outer trimmed edges of the high roof reticulated shell and the low roof reticulated shell in the central support frame meet. At each notch, the radial plane truss rotates and replicates at an interval angle centered on the central positioning point to generate floor arc trusses, and the interval angle is 3° - 8°; an arc boundary plane truss is arranged at the boundary of the notch closing truss near the outer trimmed edge truss of the high roof reticulated shell, and the lower part of the arc boundary plane truss is located on the same plane circular arc as the lower chord of the radial truss of the high reticulated shell; the end of the notch closing truss near the outer trimmed edge truss of the low roof reticulated shell is located within the internal range between the upper chord and the lower chord of the radial truss of the low roof reticulated shell. The ends of the radial plane truss and the circumferential plane truss are directly connected by intersecting welding to the upper chord, web member, and lower chord of the outer trimmed edge arc truss of the low roof reticulated shell; the radial plane truss and the circumferential plane truss are orthogonally arranged to form a two-way truss system; the cross-section of the components of the notch closing truss is a circular tube section, the main pipe is 200mm - 400mm, and the branch pipe is 100mm - 200mm; the spacing of the circumferential plane truss is 3m - 6m. The three outer trimmed edges of the high roof reticulated shell and the low roof reticulated shell are respectively provided with the form of outer trimmed edge arc trusses, and the form of the outer trimmed edge arc trusses is the form of two-end floor arc supports. It also includes a steel support cylinder located in the plane coincidence area at the intersection of the outer trimmed edge trusses of the high and low reticulated shells; the steel support cylinder is located in the four directions of southeast, southwest, northeast, and northwest where the outer trimmed edges of the high and low reticulated shells meet, and is a central support steel frame structure; the upper end of the steel support cylinder serves as the spherical hinge support for the corresponding position nodes of the lower chord layer of the low roof reticulated shell for vertical support; the support form is a seismic spherical support, disconnecting the upper steel roof structure from the lower steel support cylinder. The specific component assembly and welding process of the large-span outer trimmed edge double-roof superposed reticulated shell system with a circular inner opening is as follows: (1) The upper chord of the radial truss, the web member of the radial truss, and the lower chord of the radial truss form the basic unit of the floor arc truss of the high reticulated shell; the upper chord of the radial truss, the web member of the radial truss, and the lower chord of the radial truss form the basic unit of the floor arc truss of the low reticulated shell. (2) The upper chord of the outer tangent edge truss, the web members of the outer tangent edge truss, and the lower chord of the outer tangent edge truss form the outer tangent edge arc-shaped pipe truss of the high reticulated shell; the upper chord of the outer tangent edge truss, the web members of the outer tangent edge truss, and the lower chord of the outer tangent edge truss form the outer tangent edge arc-shaped pipe truss of the low reticulated shell; (3) The high reticulated shell basic unit and the low reticulated shell basic unit formed in step (1) are both rotated and replicated at the same interval angle with the central positioning point as the rotation center to generate the high reticulated shell floor arc-shaped pipe truss assembly and the low reticulated shell floor arc-shaped pipe truss assembly respectively; between the basic units of each bay of the high reticulated shell and the low reticulated shell, the upper chord of the circumferential truss, the web members of the circumferential truss, and the lower chord of the circumferential truss are respectively connected to form the high reticulated shell overall structure and the low reticulated shell overall structure; (4) The high reticulated shell overall structure and the low reticulated shell overall structure are respectively processed for structural boundary cutting with the high reticulated shell outer tangent edge arc-shaped pipe truss and the low reticulated shell outer tangent edge arc-shaped pipe truss formed in step (2) as the outer tangent edges; (5) On the basis of the high reticulated shell system and the low reticulated shell system after the outer tangent edge treatment in step (4), the former is provided with upper and lower chord layer radial horizontal supports and upper and lower chord layer circumferential horizontal supports, and the latter is provided with upper and lower chord layer radial horizontal supports and upper and lower chord layer circumferential horizontal supports to improve the torsional stiffness of the overall structure; (6) In the plane superposition area of the high reticulated shell system and the low reticulated shell system, the radial connecting web members and the circumferential connecting web members are connected to form the overall stress system of the double-layer superposed reticulated shell; (7) The upper chord of the radial truss, the web members of the radial truss, and the lower chord of the radial truss are assembled into a radial plane truss, and the upper chord of the circumferential truss, the web members of the circumferential truss, and the lower chord of the circumferential truss are assembled into an annular plane truss; the radial plane truss and the annular plane truss are orthogonally arranged and assembled into a notch-closed truss; (8) At the end of the notch-closed truss close to the high reticulated shell, the arc boundary plane truss assembled by the upper chord of the arc boundary truss, the web members of the arc boundary truss, and the lower chord of the arc boundary truss is directly connected or connected to the lower chord of the radial pipe truss, the lower chord of the circumferential truss, and the lower chord of the outer tangent edge truss of the high reticulated shell through the connecting web members; at the end of the notch-closed truss close to the low reticulated shell, it is directly connected to the upper chord of the outer tangent edge truss, the web members of the outer tangent edge truss, and the lower chord of the outer tangent edge truss; (9) The vertical frame columns of the steel support cylinder, the horizontal beams of the steel support cylinder, and the diagonal web members of the steel support cylinder are assembled into a steel support cylinder, and the upper end supports the double-layer superposed reticulated shell system through the top conversion support node of the steel support cylinder.

2. The large-span outer triple-edge double-roof laminated reticulated shell system with a circular inner opening according to claim 1, wherein The radial floor arc-shaped pipe truss is rotated and replicated at an interval of 3° - 8° based on the central positioning point to generate the radial floor arc-shaped pipe truss assembly, and the radial floor arc-shaped pipe trusses of each high reticulated shell and low reticulated shell are correspondingly located at the same radial position; between the radial floor arc-shaped pipe trusses of each bay, they are respectively connected by the circumferential pipe truss through penetration, and the circumferential pipe trusses form a grid, and the distance of the grid is 3m - 6m.

3. The large-span outer triple-edge double-roof laminated reticulated shell system with a circular inner opening according to claim 1, characterized in that, The triangular reticulated shell is respectively externally trisected with the positive triangle and the inverted triangle side lines, and the plane coincidence area of the central support frame is only between the outer trisected edges and the inner circle of the triangular reticulated shell, and the shortest distance is not less than 4 grids.

4. The large-span outer triple-edge double-roof laminated reticulated shell system with a circular inner opening according to claim 1, characterized in that, The triangular reticulated shell is also provided with 6 radial horizontal supports and 2 circumferential horizontal supports; the radial horizontal supports are composed of chord layer internal diagonal braces connecting the same chord layers of two radial pipe trusses, and one is formed by extending from the inner circular boundary to the ground, and the 6 radial horizontal supports are respectively arranged on both sides of the ground end of the triangular reticulated shell; the circumferential horizontal supports are composed of chord layer internal diagonal braces connecting the same chord layers of two circumferential pipe trusses, and the 2 circumferential horizontal supports are respectively arranged at the inner circle boundary and the corners of the outer arc pipe trusses.

5. The large-span external triple-edge double-roof laminated reticulated shell system with a circular inner opening according to claim 1, characterized in that, The overlapping area and non-overlapping area of the double-layer composite reticulated shell system are respectively in the form of a three-layer reticulated shell and a single-layer reticulated shell; the thickness of the three-layer reticulated shell is 1 / 12 - 1 / 20 of the span, and the corresponding thickness of the single-layer reticulated shell is 1 / 36 - 1 / 60 of the span.

6. The large-span outer triple-edge double-roof laminated reticulated shell system with a circular inner opening according to claim 1, characterized in that, The cross-section of the members of the triangular reticulated shell is a circular pipe, and the joint form is intersecting connection; the main pipes and branch pipes of the ground arc pipe trusses are 400mm - 700mm and 100mm - 400mm respectively; when the connection strength of the intersecting joints is insufficient, diaphragms are added to strengthen the joints.

7. The large-span outer triple-edge double-roof laminated reticulated shell system with a circular inner opening according to claim 1, characterized in that, The notch-closed truss is located at six notches where the outer three-cut edges of the high and low reticulated shells meet, and is composed of an orthogonal arrangement of radial plane trusses and circumferential plane trusses to form a two-way truss system; among them, at one end close to the high reticulated shell, the notch-closed truss extends 3m - 10m inside the outer cut edge, and an arc boundary plane truss is provided at the end. The plane position of the arc boundary plane truss is parallel to the plane position of the outer cut edge arc pipe truss, and the arc boundary plane truss is directly connected to the lower chord of the high roof reticulated shell or is suspended and connected through connecting web members; at one end close to the low reticulated shell, the circumferential plane truss is located between the upper chord and the lower chord of the radial pipe truss of the low roof reticulated shell and is intersecting-connected with the outer cut edge arc pipe truss.

8. The large-span outer triple-edge double-roof laminated reticulated shell system with a circular inner opening according to claim 7, characterized in that, The spacing of the radial plane trusses is 10m - 15m, and the spacing of the circumferential plane trusses is the same as that of the circumferential pipe trusses of the triangular reticulated shell.

9. Application of the large-span outer three-cut edge double-roof composite reticulated shell system with a circular inner opening as described in any one of claims 1 - 8 in the design and load-bearing of the roof structure system of a large-span complex space building with an internal circular open-air opening.

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