Large-diameter ring truss and string grid combined structure system

Abstract

The invention provides a large-diameter ring truss and string grid combined structure system, and relates to the field of large-span space structures of constructional engineering. The structure comprises a string grid, a ring truss and a V-shaped inclined column support, the string grid located on the inner roof and the ring truss located on the outer roof are hinged through a plurality of groups of brackets and pin shafts which are distributed in an annular array mode. The multiple sets of V-shaped inclined column supports inclining towards the interior of the ring truss are concentrically arranged, distributed in the ring direction of the ring truss in an array mode and supported at the bottom of the ring truss. The problems of external action of the steel roof and release of wind load are solved, horizontal load is transmitted to a plurality of V-shaped inclined column supports which are arranged in an annular array mode through a roof plane which is evenly distributed and large in rigidity, the horizontal load is transmitted to a supporting structure on the lower portion in the shortest path, and the situation that the roof generates an overlarge earthquake torsion effect is avoided; the whole structure system is simple and efficient, and the rigidity and bearing capacity of the structure are evenly distributed.

Description

Technical Field

[0001] This application relates to the field of large-span spatial structures in building engineering, and in particular to a combined structural system of large-diameter ring trusses and tensioned grids. Background Technology

[0002] Large-span spatial steel structure systems feature complex and diverse steel roof systems, with most structures employing large-span steel frameworks to create vast, column-free enclosed exhibition spaces. Structural design aims to better realize the architect's intentions while meeting the owner's economic requirements, and achieving optimal safety and functionality. Current large-span structural designs, through the use of innovative structural designs and new building materials, are increasingly meeting the demands for lightweight, large-span structures.

[0003] Currently, the commonly used basic structural types for large-span spatial structures include truss structures, reticulated shell structures, and cable-stayed structures. Among them, truss structures have high stiffness, large span capacity, and excellent spatial stress performance, and offer a variety of shapes. However, the dense members at the nodes make fabrication and installation more complex than planar structures, requiring advanced construction techniques. Reticulated shell structures have a reasonable stress distribution and save materials, but they have low stability, low redundancy, and are sensitive to load distribution and node stiffness. Cable-stayed structures are lightweight and can economically span large spaces. They also offer diverse forms and flexible arrangements, but as the span increases, problems such as decreased structural stability, increased difficulty in prestressing construction, and a significant increase in structural weight arise.

[0004] Therefore, there is an urgent need to propose a composite structure for a large-span steel roof that avoids the problems of the above-mentioned structures and has the characteristics of clear force transmission path, high structural efficiency, and simple architectural appearance. Summary of the Invention

[0005] One of the objectives of this application is to provide a combined structural system of large-diameter ring trusses and tensioned grids, which aims to solve the problem of poor stability caused by uneven distribution of stiffness and bearing capacity in existing large-span steel roof structures.

[0006] The technical solution of this application is: A large-diameter ring truss and tensioned grid combined structural system includes a tensioned grid, a ring truss, and V-shaped inclined column supports; the tensioned grid on the inner roof and the ring truss on the outer roof are hinged together by multiple sets of circumferentially arrayed corbels and pins; the multiple sets of V-shaped inclined column supports, which are inclined inward toward the ring truss, are all arranged concentrically and are distributed in a circumferential array along the ring truss and supported at the bottom of the ring truss.

[0007] As one technical solution of this application, the ring truss includes a ring-shaped main truss, an inner cantilever structure, and an outer cantilever structure; the inner cantilever structure is located on the outer ring of the tensioned grid and is hinged to the tensioned grid through the corbel and the pin; the ring-shaped main truss is located on the outer ring of the inner cantilever structure and is connected to the inner cantilever structure; the outer cantilever structure is located on the outer ring of the ring-shaped main truss and is connected to the ring-shaped main truss; the inner cantilever structure and the outer cantilever structure are arranged in a ring array along the inner and outer sides of the ring-shaped main truss, respectively, and together with the ring-shaped main truss, they form a triangular tubular truss structure.

[0008] As one technical solution of this application, the annular main truss includes two annular upper chords, two annular lower chords, an upper chord connecting rod, a lower chord connecting rod, and a main web member; the two annular upper chords are respectively spaced apart on the outer ring of the inner cantilever structure; the two annular lower chords are respectively spaced apart on the outer ring of the inner cantilever structure, and are both located below the corresponding annular upper chords, and the projections of the two annular upper chords on the plane where the two annular lower chords are located are outside the two annular lower chords; the upper chord connecting rods are respectively arranged in a circumferential array along the annular upper chords, and their two ends are respectively connected between the two annular upper chords; the lower chord connecting rods are respectively arranged in a circumferential array along the annular lower chords, and their two ends are respectively connected between the two annular lower chords; one end of the main web member is connected to the connection node between the corresponding annular upper chord and the upper chord connecting rod, and the other end is connected to the connection node between the corresponding annular lower chord and the lower chord connecting rod.

[0009] As one technical solution of this application, the inner cantilever structure includes an inner ring chord, an inner radial upper chord, an inner radial lower chord, and inner web members; the inner ring chord is hinged to the tensioned mesh through the corbel and the pin; the inner radial upper chord and the inner radial lower chord are arrayed along the circumferential direction of the inner ring chord, and one end is connected to the same connection node on the inner ring chord; the other end of the inner radial upper chord is connected to the connection node of the corresponding annular upper chord and the upper chord connecting rod; the other end of the inner radial lower chord is connected to the connection node of the corresponding annular lower chord and the lower chord connecting rod; one end of multiple inner web members is connected to the same connection node of the inner radial lower chord, and the other end is connected to the connection node of the corresponding annular upper chord and the upper chord connecting rod, respectively, to form multiple triangular meshes.

[0010] As one technical solution of this application, the cantilever structure includes an outer ring chord, an outer radial upper chord, an outer radial lower chord, and outer web members; the outer ring chord is disposed on the outer ring of the annular main truss; the outer radial upper chord and the outer radial lower chord are arranged in an array along the circumferential direction of the outer ring chord, and one end of each is connected to the same connection node on the outer ring chord; the other end of each outer radial upper chord is connected to the connection node between the corresponding annular upper chord and the upper chord connecting rod; the other end of each outer web member is connected to the same connection node of the outer radial lower chord, and the other end is connected to the connection node between the corresponding annular upper chord and the upper chord connecting rod, to form multiple triangular grids.

[0011] As one technical solution of this application, the tensioned mesh is a double-layer suspension structure including a pressure mesh and radially arranged suspension mechanisms. The pressure mesh includes a central pressure ring, a central tension ring, an intermediate mesh, and an outer mesh ring. The central tension ring and the central pressure ring are arranged parallel to each other from bottom to top and have the same diameter. The outer mesh ring is located on the outer ring of the central pressure ring and its height is lower than that of the central pressure ring. The intermediate mesh is an array-type spherical mesh shell structure and is connected between the central pressure ring and the outer mesh ring. The suspension mechanisms are respectively distributed in an array-type interval along the circumferential direction of the central tension ring and the outer mesh ring, and are respectively connected between the central tension ring and the outer mesh ring.

[0012] As one technical solution of this application, the intermediate grid has broken line segments and straight rod segments; the broken line segments are manufactured separately; the straight rod segments are connected to both ends of the broken line segments by butt welds, so as to form an X-shaped intersection node together with the broken line segments.

[0013] As one technical solution of this application, the suspension mechanism includes cable members and vertically evenly distributed vertical struts. The cable members include cable heads, cables, and cable clamps. The cables are arranged at intervals along the circumferential direction of the outer ring of the grid, with one end connected to the connection node between the outer ring of the grid and the corbel, and the other end connected to the central pull ring through the cable head. Multiple cable clamps are evenly distributed radially on the cables, and the cable clamps are pivotally connected to the corresponding X-shaped intersection nodes on the middle grid through the vertical struts.

[0014] As one technical solution of this application, the V-shaped inclined column support is welded to the connection node between the annular lower chord and the lower chord connecting rod on the outer ring, and a local reinforcement method is adopted to strengthen the connection node between the V-shaped inclined column support and the annular lower chord.

[0015] As one technical solution of this application, the V-shaped inclined column support includes two inclined columns, a cast steel component, and a pre-embedded steel frame; the two inclined columns form a V shape, and their lower ends meet at the cast steel component, and are connected to the pre-embedded steel frame through the cast steel component.

[0016] The beneficial effects of this application are: (1) This application designs a large-diameter ring truss and tensioned grid combined structural system, which adopts a combination of ring truss on the outer roof and tensioned grid on the inner roof. The vertical force of the tensioned grid on the inner roof is transmitted to the ring truss on the outer roof through the bracket hinge pin. The ring truss on the outer roof is supported by inclined V-shaped columns. The hinged structure of bracket and pin can release horizontal stress such as wind load, and at the same time, it can also release the internal stress of the overall structure itself. It solves the problem of releasing external forces and wind load. The hinged structure of bracket and pin is relatively better than conventional welded connection. The connection requires higher precision, which better ensures the overall stability of the structure. The V-shaped inclined column supports are evenly distributed on the outside of the ring truss, transferring the overall weight of the steel roof to the foundation. Its inward tilt design can also resist external horizontal loads, increasing the stability of the structure. The loads are transferred to the several V-shaped inclined column supports arranged in a ring array through the evenly distributed and stiff roof plane, transferring the horizontal loads to the lower supporting structure through the shortest path, avoiding excessive seismic torsional effects on the roof. The entire structural system is simple and efficient, with uniform distribution of structural stiffness and load-bearing capacity.

[0017] (2) Furthermore, the overall structure of this application adopts a circumferential array design with uniform planar layout and moderate span distribution in each direction, which effectively avoids the occurrence of sudden changes in overall stiffness. For possible weak parts, local reinforcement measures are adopted to improve their support capacity, which solves the problem of excessive internal force and deformation concentration caused by local weakening or sudden changes in weak parts. Thus, the structural system has high stability and load-bearing capacity.

[0018] (3) Furthermore, this application uses corbels and pins to connect the inner roof and the outer roof. Under the action of temperature, no redundant force is generated between the inner roof and the outer roof, and radial translation is released. This solves the problem of stress concentration and low redundancy caused by rigid connection of conventional roof structure, and improves the stability and durability of roof structure under multi-directional load.

[0019] (4) Furthermore, this application adopts a suspension mechanism set below the tensioned grid to tension it inward. The tensioned grid of the inner roof forms a tensioned system with the tensioned grid and the tensioned cable, so that the inner roof is in a stable state as a whole. This reduces the vertical shear force borne by the pressure grid and solves the problem that large downward deformation is likely to occur in the column-free area of ​​the center of conventional roof structure, thus making the combined roof structure have high stability.

[0020] (5) Furthermore, the V-shaped inclined column support of this application adopts an inwardly inclined design. When it is subjected to the self-weight pressure of the roof structure as a whole, the circumferentially distributed V-shaped inclined column support and the ring truss cooperate with each other. Multiple sets of V-shaped inclined column supports will generate a reaction force towards the center, which solves the deformation problem caused by the horizontal shear force generated by other loads. This is conducive to controlling the horizontal displacement of the roof as a whole and improving the stability of the structure. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 Axonometric drawing of a large-diameter ring truss and tensioned grid combined structural system provided in an embodiment of this application; Figure 2 This is a top view of the large-diameter ring truss and tensioned grid combined structural system provided in the embodiments of this application; Figure 3 A partial structural schematic diagram of the large-diameter ring truss and tensioned grid combined structural system provided in an embodiment of this application; Figure 4 A schematic diagram of a ring truss provided in an embodiment of this application; Figure 5 This is a partial schematic diagram of the tensioned mesh provided in an embodiment of this application; Figure 6 This is a schematic diagram of a V-shaped inclined column support provided in an embodiment of this application; Figure 7 This is a schematic diagram of the connection node between the ring truss and the tensioned mesh provided in an embodiment of this application; Figure 8 This is a schematic diagram of the first angle of the connection between the ring truss and the tensioned mesh provided in an embodiment of this application; Figure 9 This is a schematic diagram of the middle region structure of the tensioned mesh provided in an embodiment of this application; Figure 10 This is a schematic diagram of the first angle of the tensioned mesh intermediate region structure provided in an embodiment of this application; Figure 11 This is a schematic diagram of the second angle of the tensioned mesh intermediate region structure provided in an embodiment of this application; Figure 12 This is a schematic diagram of the third angle of the tensioned mesh intermediate region structure provided in an embodiment of this application; Figure 13 This is a schematic diagram of the cable member arrangement provided in an embodiment of this application; Figure 14 This is a schematic diagram of a cable member structure provided in an embodiment of this application; Figure 15 This is a schematic diagram of the internal nodes of the tensioned mesh provided in an embodiment of this application; Figure 16 This is a schematic diagram of the internal nodes of the tensioned mesh provided in an embodiment of this application; Figure 17 A schematic diagram of local reinforcement in the connection node area of ​​the large-diameter ring truss and tensioned grid combined structural system provided in the embodiments of this application; Figure 18 This is a schematic diagram of the stress analysis of the large-diameter ring truss and tensioned grid combined structural system provided in the embodiments of this application.

[0023] Icons: 1-Tension mesh; 2-Ring truss; 3-V-shaped inclined column support; 4-Corner; 5-Pin; 6-Ring upper chord; 7-Ring lower chord; 8-Upper chord connecting rod; 9-Lower chord connecting rod; 10-Main web member; 11-Inner ring chord; 12-Inner radial upper chord; 13-Inner radial lower chord; 14-Inner web member; 15-Outer ring chord; 16-Outer radial upper chord; 17-Outer radial lower chord; 18-Outer web member; 19-Central pressure ring; 20-Central tension ring; 21-Intermediate mesh; 22-Outer ring of mesh; 23-Broken line segment; 24-Straight bar segment; 25-Cable member; 26-Vertical strut; 27-Cable head; 28-Cable; 29-Cable clamp; 30-Inclined column; 31-Cast steel component; 32-Embedded steel frame. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] In the description of this application, it should be noted that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use. They are only used to facilitate the description of this application and to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0028] Furthermore, in this application, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Moreover, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] Example: Please refer to Figure 1 (Refer to) Figures 2 to 18This application provides a combined structure system of a large-diameter ring truss and a tensioned grid, which avoids the disadvantages of traditional truss structures having many members and poor stability of grid shell structures, while solving the problem of poor stability of traditional suspension structures under load. It mainly includes a tensioned grid 1, a ring truss 2, and V-shaped inclined column supports 3; wherein, the tensioned grid 1 on the inner roof and the ring truss 2 on the outer roof are hinged together by multiple sets of circumferentially arrayed corbels 4 and pins 5; simultaneously, multiple sets of V-shaped inclined column supports 3, inclined inwards towards the ring truss 2, are concentrically arranged and distributed in a circumferential array along the ring truss 2, supporting the bottom of the ring truss 2. This structure adopts an external roof ring truss 2 + internal roof tensioned grid 1 structural form, connecting the internal and external roofs through hinges, which effectively reduces secondary stresses generated between them under temperature effects. Simultaneously, the structural system utilizes multiple sets of concentrically arranged high-strength V-shaped inclined column supports 3, ensuring uniform overall structural stiffness, clear force paths, and relatively simple node construction. Furthermore, it employs a ring array design concept, featuring high modularity, gridding, and ease of construction. Moreover, as... Figure 7 and Figure 8 As shown, the inner and outer roofs are connected by brackets 4 and pins 5 to avoid stress concentration in traditional welded connections. At the same time, the positions of each connection node of the structural system are reinforced to ensure that the stress of each connection node meets the self-weight load support requirements of the inner roof. The hinged connection of brackets 4 and pins 5 ensures that no redundant force is generated between the two under temperature action and releases radial translation, thereby improving the stability and durability of the roof structure under multi-directional loads.

[0032] Specifically, the grid division of this structural system is related to the radial axes, which total 30. The outer roof ring truss 2 is divided into segments of 30 in the circumferential direction, with each segment being 12°. The inner roof upper chord compression grid is also divided into segments of 30 in the circumferential direction, consistent with the ring truss 2, and then divided into intermediate grids 21 in the radial direction by 6. The lower chord of the inner roof has 10 cable members 25, where 10 is a factor of 30 and is a multiple of the number 5 of the three V-shaped inclined column supports.

[0033] like Figure 3 and Figure 4 As shown, its ring truss 2 includes a ring main truss, an inner cantilever structure, and an outer cantilever structure; wherein, the inner cantilever structure is located on the outer ring of the tensioned grid 1 and is hinged to the tensioned grid 1 through the bracket 4 and the pin 5; at the same time, its ring main truss is located on the outer ring of the inner cantilever structure and is connected to the inner cantilever structure; in addition, the outer cantilever structure is located on the outer ring of the ring main truss and is connected to the ring main truss; the inner cantilever structure and the outer cantilever structure are arranged in a ring array along the inner and outer sides of the ring main truss respectively, and together with the ring main truss, they form a triangular tubular truss structure.

[0034] It should be noted that, in this embodiment, the annular main truss includes two annular upper chords 6, two annular lower chords 7, an upper chord connecting rod 8, a lower chord connecting rod 9, and a main web member 10; the two annular upper chords 6 are respectively spaced apart on the outer ring of the inner cantilever structure; the two annular lower chords 7 are respectively spaced apart on the outer ring of the inner cantilever structure, and are both located below the corresponding annular upper chords 6, and the projections of the two annular upper chords 6 onto the plane containing the two annular lower chords 7 are located outside the two annular lower chords 7. Rod 6 and the annular lower chord rod 7 are both full-circle arc-shaped round tubes; the upper chord connecting rods 8 are arranged in a circumferential array along the annular upper chord rod 6, and their two ends are horizontally connected between the two annular upper chord rods 6; the lower chord connecting rods 9 are arranged in a circumferential array along the annular lower chord rod 7, and their two ends are horizontally connected between the two annular lower chord rods 7; one end of the main web rod 10 is connected to the connection node of the corresponding annular upper chord rod 6 and the upper chord connecting rod 8, and the other end is connected to the connection node of the corresponding annular lower chord rod 7 and the lower chord connecting rod 9.

[0035] The various intersecting upper chord connecting rods 8, lower chord connecting rods 9, and main web members 10 inside the outer roof ring truss 2 are arranged in a ring array with a ring division number of 30. The six ring upper chord rods 6, ring lower chord rods 7, upper chord connecting rods 8, and lower chord connecting rods 9 are connected to form a whole, with uniform strength distribution, which improves the overall structural stiffness of the ring truss 2.

[0036] It should be noted that, in this embodiment, the inner cantilever structure includes an inner ring chord 11, an inner radial upper chord 12, an inner radial lower chord 13, and inner web members 14. The inner ring chord 11 is hinged to the tension grid 1 via a bracket 4 and a pin 5. The inner radial upper chord 12 and the inner radial lower chord 13 are arranged in an array along the circumferential direction of the inner ring chord 11, and one end of each is connected to the same connection node on the inner ring chord 11. The other end of the inner radial upper chord 12 is connected to the connection node of the corresponding annular upper chord 6 and the upper chord connecting rod 8. The other end of the inner radial lower chord 13 is connected to the connection node of the corresponding annular lower chord 7 and the lower chord connecting rod 9. One end of each of the multiple inner web members 14 is connected to the same connection node of the inner radial lower chord 13, and the other end is connected to the connection node of the corresponding annular upper chord 6 and the upper chord connecting rod 8, forming multiple triangular grids to stabilize the cantilever structure and reduce the deformation of the cantilever under the chord.

[0037] Furthermore, the cantilever structure includes an outer ring chord 15, an outer radial upper chord 16, an outer radial lower chord 17, and outer web members 18. The outer ring chord 15 is located on the outer ring of the annular main truss. The outer radial upper chord 16 and the outer radial lower chord 17 are arranged in an array along the circumferential direction of the outer ring chord 15, and one end of each is connected to the same connection node on the outer ring chord 15. The other end of the outer radial upper chord 16 is connected to the connection node of the corresponding annular upper chord 6 and the upper chord connecting rod 8. The other end of the outer radial lower chord 17 is connected to the connection node of the corresponding annular lower chord 7 and the lower chord connecting rod 9. One end of each of the multiple outer web members 18 is connected to the same connection node of the outer radial lower chord 17, and the other end is connected to the connection node of the corresponding annular upper chord 6 and the upper chord connecting rod 8, forming multiple triangular grids.

[0038] Furthermore, such as Figure 5 As shown, and in conjunction with Figures 9 to 12 Its tensioned mesh 1 is a double-layer suspension structure, including a pressure mesh and radially arranged suspension mechanisms. The pressure mesh includes a central pressure ring 19, a central tension ring 20, an intermediate mesh 21, and an outer mesh ring 22. The central tension ring 20 and the central pressure ring 19 are arranged parallel to each other from bottom to top and have the same diameter. They are connected vertically by evenly distributed vertical struts 26, and both ends of the vertical struts 26 are hinged by pins 5. The outer mesh ring 22 is located on the outer ring of the central pressure ring 19 and is lower than the height of the central pressure ring 19. It is connected by brackets 4 and pins 5. The inner ring chord 11 in the cantilever structure is hinged and fixed to transfer the self-weight load to the ring truss 2; the middle grid 21 is an array-type spherical grid shell structure and is connected between the middle pressure ring 19 and the outer grid ring 22; the middle grid 21 adopts a threaded array design, and the force is regular and uniform; the central pressure ring is the highest point, and the height of the top surface of the middle grid 21 gradually decreases from the center to the edge; the suspension mechanism is distributed in an array-type interval along the middle pull ring 20 and the outer grid ring 22, and is connected between the middle pull ring 20 and the outer grid ring 22 respectively.

[0039] Specifically, such as Figure 12 As shown, the central grid 21 has a broken line segment 23 and a straight rod segment 24; the broken line segment 23 is fabricated separately; the straight rod segment 24 is connected to both ends of the broken line segment 23 by butt welds, so as to form an X-shaped intersection node together with the broken line segment 23. This design reduces the fabrication difficulty of the X-shaped intersection node and facilitates on-site construction and installation.

[0040] Meanwhile, the suspension mechanism includes cable members 25 and vertically distributed vertical struts 26. The cable members 25 are arranged radially along the radial axis. Specifically, 10 cable members 25 are evenly arranged radially along the radial axis, and their two ends are respectively hinged to the outer ring of the grid 22 and the central pull ring. The central pull ring is stabilized in the central position under the uniform tension of the cable 28. The cable member 25 includes a cable head 27, a cable 28, and a cable clamp 29. The cable 28 is arranged circumferentially along the outer ring of the grid 22, and one end is connected to the connection node between the outer ring of the grid 22 and the corbel 4, and the other end is connected to the central pull ring 20 through the cable head 27. Figures 14 to 16 As shown, multiple cable clips 29 are radially and evenly distributed on the cable 28. The cable clips 29 are hinged to the corresponding X-shaped intersection nodes on the middle grid 21 by pins 5 through the vertical struts 26 to transmit the tension preload.

[0041] The central pull ring 20 is located at the center of the tensioned grid 1. The cable members 25 are uniformly connected to the central pull ring 20. The central pull ring 20 is stabilized at the center position under the uniform tension of the cable 28.

[0042] The intermediate grid 21 has the same number of circumferential divisions as the outer roof truss 2. It is then further divided radially to create a grid. The number of cable members 25 radially arranged on the lower chord of the inner roof is a factor of the number of circumferential divisions and a multiple of the number of V-shaped inclined column supports (3 groups). Vertical struts 26 are vertically arranged directly below the X-shaped intersection nodes of the intermediate grid 21 and connected to cables 28 via cable clamps 29. Their number matches the number of radial divisions in the grid. The vertical struts 26 hinge the lower suspension mechanism to the upper compression grid, thus limiting the relative position of the cable members 25 and the intermediate grid 21. This improves the stability of the suspension mechanism, prevents large positional shifts between the lower suspension mechanism and the upper compression grid, and enhances the stability of the inner roof structure.

[0043] By applying a certain prestress to the cable 28 and applying an upward reaction force to the vertical strut 26 in the middle connection, a certain prestress is provided to the upper chord compression grid, so that the inner roof tension grid 1 forms a stable structure as a whole, reducing the deformation stress and vertical shear force borne by the compression grid, which is beneficial to controlling the overall deformation of the roof structure.

[0044] like Figure 6As shown, the upper part of the V-shaped inclined column support 3 is welded to the connection node between the outer ring lower chord 7 and the lower chord connecting rod 9, which is the main load-bearing node. Local reinforcement is used to strengthen the connection node between the V-shaped inclined column support 3 and the ring lower chord 7. Its lower part is rigidly connected to the foundation through pre-embedded steel reinforcement 32. Simultaneously, the node positions of the ring truss 2 require local reinforcement. This is achieved by arranging partitions inside the arc-shaped circular tubes such as the ring upper chord 6 and the ring lower chord 7, and by increasing the wall thickness of the circular tubes, thereby improving the rigidity of the nodes and reducing material waste while meeting the load-bearing requirements.

[0045] like Figure 17 As shown, five sets of V-shaped inclined column supports, totaling ten support points, are evenly distributed on the annular lower chord 7 of the ring truss 2, located in the middle of the ring truss 2 segment. Simultaneously, methods such as adding pipe walls and inner ring plates are used to locally strengthen this node location, improving the structure's load-bearing capacity.

[0046] Furthermore, the V-shaped inclined column support 3 includes two inclined columns 30, a cast steel component 31, and a pre-embedded steel frame 32. The two inclined columns 30 form a V-shape, and their lower ends converge at the cast steel component 31, which is rigidly connected to the pre-embedded steel frame 32, thus transferring the self-weight load of the steel roof to the foundation. Multiple sets of V-shaped inclined column supports 3 are evenly arranged around the perimeter of the ring truss 2, ensuring uniform vertical stress on the roof structure and improving structural stability. Specifically, in this embodiment, there are 5 sets. Moreover, a cast steel component 31 is used at the midpoint of the intersection of the lower ends of the two inclined columns 30 to improve the load-bearing capacity of the node. The cast steel component 31 is connected to the pre-embedded steel frame 32, transferring the overall self-weight load of the steel roof to the foundation through the V-shaped inclined column support 3. The overall structural stiffness is uniform and stable, and the stress path is clear.

[0047] Furthermore, the V-shaped inclined column support 3 adopts an inward tilting design. When it is subjected to the self-weight pressure of the roof structure as a whole, the inclined column 30 system will generate a reaction force towards the center. The circumferentially distributed V-shaped inclined column support 3 and the ring truss 2 cooperate with each other to reduce the horizontal shear force generated by other loads borne by the roof structure, which is conducive to controlling the horizontal displacement of the roof as a whole and improving the stability of the structure.

[0048] The outer roof ring truss 2 is evenly divided in the circumference. Various intersecting upper chord connecting rods 8, lower chord connecting rods 9 and main web members 10 are arranged in a circumferential array inside, connecting the ring upper chord 6 and the ring lower chord 7 to form a whole, which helps to improve the overall structural strength of the ring truss 2. At the same time, the array arrangement of various members makes the structural stiffness of the ring truss 2 uniform and the installation and positioning of the members convenient.

[0049] The force principle of this structural system is as follows: Figure 18As shown, its overall structural form is centrally symmetrical, which can more effectively control the deformation of the roof structure. The inner roof forms a tensioned system with the compression grid and the cable 28. The vertical shear force in the central part is small, and it is a self-balancing structure. The vertical load generated by its own weight is transferred to the outer roof ring truss 2 through the bracket 4 and the pin 5. The outer roof ring truss 2 is supported by the inclined V-shaped column support 3, which transfers the load of the entire roof structure to the ground foundation.

[0050] In summary, this application designs a combined structure system of a large-diameter ring truss and a tensioned grid, which adopts a combination of an outer roof ring truss 2 and an inner roof tensioned grid 1. The vertical force of the inner roof tensioned grid 1 is transferred to the outer roof ring truss 2 through the hinged pins 5 of the corbels 4. The outer roof ring truss 2 is supported by inclined V-shaped columns 3, which solves the problem of releasing external forces and wind loads. The loads are transferred to several V-shaped inclined column supports 3 arranged in a ring array through the evenly distributed and stiff roof plane, so that the horizontal loads are transferred to the lower supporting structure through the shortest path, avoiding excessive seismic torsional effects on the roof. The entire structural system is simple and efficient, and the stiffness and bearing capacity of the structure are evenly distributed. Furthermore, the overall structure of this application adopts a circumferential array design with a uniform planar layout and moderate span distribution in each direction, effectively avoiding abrupt changes in overall stiffness. For potentially weak points, local reinforcement measures are adopted to improve their support capacity, solving the problem of excessive internal forces and deformation concentration caused by local weakening or abrupt changes in weak points. This results in a structural system with high stability and load-bearing capacity. Simultaneously, this application uses brackets 4 and pins 5 to connect the inner and outer roofs. Under temperature effects, no redundant forces are generated between the inner and outer roofs, and radial translation is released. This solves the problems of stress concentration and low redundancy caused by rigid connections in conventional roof structures, improving the stability and durability of the roof structure under multi-directional loads. Furthermore, this application employs a suspension mechanism below the tensioned grid 1, which is tensioned inwards. The tensioned grid 1 of the inner roof forms a tensioned system with the tension cables 28 through the compression grid, ensuring the overall stability of the inner roof. This reduces the vertical shear force borne by the compression grid and solves the problem of large downward deformation in the column-free central area of ​​conventional roof structures, thus giving the combined roof structure high stability. Moreover, the V-shaped inclined column supports 3 of this application are designed to be inwardly inclined. When subjected to the self-weight pressure of the entire roof structure, the circumferentially distributed V-shaped inclined column supports 3 and the ring truss 2 cooperate with each other, and multiple sets of V-shaped inclined column supports 3 generate a reaction force towards the center. This solves the deformation problem caused by the horizontal shear force generated by other loads, which is beneficial for controlling the overall horizontal displacement of the roof and improving the stability of the structure.

[0051] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A combined structural system of large-diameter ring truss and tensioned grid, characterized in that, It includes a tensioned grid, a ring truss, and V-shaped inclined column supports; the tensioned grid on the inner roof and the ring truss on the outer roof are hinged together by multiple sets of circumferentially arrayed corbels and pins; the multiple sets of V-shaped inclined column supports that are inclined inward toward the ring truss are all arranged concentrically and are distributed in a circumferential array along the ring truss and supported at the bottom of the ring truss.

2. The large-diameter ring truss and tensioned grid combined structural system according to claim 1, characterized in that, The ring truss includes a ring-shaped main truss, an inner cantilever structure, and an outer cantilever structure. The inner cantilever structure is located on the outer ring of the tensioned grid and is hinged to the tensioned grid through the corbel and the pin. The ring-shaped main truss is located on the outer ring of the inner cantilever structure and is connected to the inner cantilever structure. The outer cantilever structure is located on the outer ring of the ring-shaped main truss and is connected to the ring-shaped main truss. The inner cantilever structure and the outer cantilever structure are arranged in a ring array along the inner and outer sides of the ring-shaped main truss, respectively, and together with the ring-shaped main truss, they form a triangular tubular truss structure.

3. The large-diameter ring truss and tensioned grid combined structural system according to claim 2, characterized in that, The annular main truss includes two annular upper chords, two annular lower chords, an upper chord connecting rod, a lower chord connecting rod, and a main web member. The two annular upper chords are spaced apart on the outer ring of the inner cantilever structure. The two annular lower chords are spaced apart on the outer ring of the inner cantilever structure, both located below the corresponding annular upper chords, and the projections of the two annular upper chords onto the plane of the two annular lower chords are located outside the two annular lower chords. The upper chord connecting rods are arranged in a circumferential array along the annular upper chords, and their two ends are connected between the two annular upper chords. The lower chord connecting rods are arranged in a circumferential array along the annular lower chords, and their two ends are connected between the two annular lower chords. One end of the main web member is connected to the connection node between the corresponding annular upper chord and the upper chord connecting rod, and the other end is connected to the connection node between the corresponding annular lower chord and the lower chord connecting rod.

4. The large-diameter ring truss and tensioned grid combined structural system according to claim 3, characterized in that, The inner cantilever structure includes an inner ring chord, an inner radial upper chord, an inner radial lower chord, and inner web members. The inner ring chord is hinged to the tensioned mesh via the corbel and the pin. The inner radial upper chord and the inner radial lower chord are arranged in an array along the circumferential direction of the inner ring chord, and one end of each is connected to the same connection node on the inner ring chord. The other end of the inner radial upper chord is connected to the connection node between the corresponding annular upper chord and the upper chord connecting rod, and the other end of the inner radial lower chord is connected to the connection node between the corresponding annular lower chord and the lower chord connecting rod. One end of multiple inner web members is connected to the same connection node of the inner radial lower chord, and the other end is connected to the connection node between the corresponding annular upper chord and the upper chord connecting rod, forming multiple triangular meshes.

5. The large-diameter ring truss and tensioned grid combined structural system according to claim 3, characterized in that, The cantilever structure includes an outer ring chord, an outer radial upper chord, an outer radial lower chord, and outer web members. The outer ring chord is located on the outer ring of the annular main truss. The outer radial upper chord and the outer radial lower chord are arranged in an array along the circumferential direction of the outer ring chord, and one end of each is connected to the same connection node on the outer ring chord. The other end of each outer radial upper chord is connected to the connection node between the corresponding annular upper chord and the upper chord connecting rod. The other end of each outer radial lower chord is connected to the connection node between the corresponding annular lower chord and the lower chord connecting rod. One end of each of the multiple outer web members is connected to the same connection node of the outer radial lower chord, and the other end is connected to the connection node between the corresponding annular upper chord and the upper chord connecting rod, forming multiple triangular grids.

6. The large-diameter ring truss and tensioned grid combined structural system according to claim 1, characterized in that, The tensioned mesh is a double-layer suspension structure comprising a pressure mesh and radially arranged suspension mechanisms. The pressure mesh includes a central pressure ring, a central tension ring, an intermediate mesh, and an outer mesh ring. The central tension ring and the central pressure ring are arranged parallel to each other from bottom to top and have the same diameter. The outer mesh ring is located on the outer ring of the central pressure ring and is lower than the height of the central pressure ring. The intermediate mesh is an array-type spherical mesh shell structure and is connected between the central pressure ring and the outer mesh ring. The suspension mechanisms are distributed in an array-type interval along the circumferential direction of the central tension ring and the outer mesh ring, and are respectively connected between the central tension ring and the outer mesh ring.

7. The large-diameter ring truss and tensioned grid combined structural system according to claim 6, characterized in that, The intermediate grid has broken line segments and straight rod segments; the broken line segments are made separately; the straight rod segments are connected to both ends of the broken line segments by butt welds, so as to form an X-shaped intersection node together with the broken line segments.

8. The large-diameter ring truss and tensioned grid combined structural system according to claim 7, characterized in that, The suspension mechanism includes cable components and vertically evenly distributed vertical struts. The cable components include cable heads, cables, and cable clamps. The cables are arranged at intervals along the outer ring of the grid, with one end connected to the connection node between the outer ring of the grid and the corbel, and the other end connected to the central pull ring through the cable head. Multiple cable clamps are evenly distributed radially on the cables, and the cable clamps are pivotally connected to the corresponding X-shaped intersection nodes on the middle grid through the vertical struts.

9. The large-diameter ring truss and tensioned grid combined structural system according to claim 3, characterized in that, The V-shaped inclined column support is welded to the connection node between the outer ring lower chord and the lower chord connecting rod, and a local reinforcement method is used to strengthen the connection node between the V-shaped inclined column support and the ring lower chord.

10. The large-diameter ring truss and tensioned grid combined structural system according to claim 1, characterized in that, The V-shaped inclined column support includes two inclined columns, a cast steel component, and a pre-embedded steel frame; the two inclined columns form a V shape, and their lower ends meet at the cast steel component, and are connected to the pre-embedded steel frame through the cast steel component.

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