CN109750781B - Rotary conical surface sunflower type cable dome - Google Patents
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- CN109750781B CN109750781B CN201910042540.9A CN201910042540A CN109750781B CN 109750781 B CN109750781 B CN 109750781B CN 201910042540 A CN201910042540 A CN 201910042540A CN 109750781 B CN109750781 B CN 109750781B
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Abstract
The invention discloses a rotary cone sunflower-shaped cable dome. The cable consists of a circumferential cable, an oblique upward cable, an oblique downward cable, a vertical compression bar and a connecting node; the curved surface of the cable net formed by the oblique upward inhaul cables is a rotary conical surface and is a curved surface with zero Gaussian curvature; the lower end of the vertical compression bar is connected with the oblique downward stay rope and the circumferential stay rope, the upper end of the vertical compression bar is connected with the oblique upward stay rope and the oblique downward stay rope, the outer-ring oblique downward stay rope and the oblique upward stay rope are fixed on a support seat on the periphery of the structure, and the oblique upward stay ropes are connected with each other to form a rotary conical surface in a sunflower-shaped mode; the structural span can be determined according to the requirements of structural modeling, use functions, bearing capacity and the like; the invention expands the cable dome from the existing positive Gaussian curvature curved surface, negative Gaussian curvature curved surface and cylindrical surface to the zero Gaussian curvature curved surface of the rotary conical surface, so that the cable dome can be applied to more modeling structures, and the rotary conical surface of the sunflower model enhances the torsional resistance of the structure.
Description
Technical Field
The invention relates to a stretching integral structure form, in particular to a rotary cone sunflower-shaped cable dome, which has application range including building structure, aerospace structure, ocean structure and the like.
Background
Through the development of recent decades, various types of tensile integral structures are widely applied to building structures, aerospace structures, underwater bionic fish structures and human biological structures in all countries of the world. Among them, the cable dome is a special form of the stretch-draw integral structure, which is a structural system considered to be the best structural efficiency so far, and the type of the cable dome which has been developed now has a spherical shell cable dome with positive Gaussian curvature and a saddle surface cable dome with negative Gaussian curvature, but the cable domes in service all over the world are spherical shell cable domes with positive Gaussian curvature.
Along with the improvement of functions and the diversification of appearance models of buildings or structures, the existing cable dome form can not meet the development requirements of the diversification of the building and the structural models, and the cable dome is an efficient structural system which can not be popularized and applied in more practical projects with peculiar modeling, for example, when the top of the building is designed to be in a conical surface appearance, the span of the structure is not large, but the height loss is large, aiming at the building structure, the structural system with large dead weight such as a masonry structure or a concrete structure is mainly adopted, and the structural system with large dead weight is partially adopted, but the defect of the structural dead weight is not obviously improved yet. For another example, the appearance of the existing Christmas tree with larger losing height and smaller span is in a rotary conical surface shape, if a novel cable dome type can be invented to directly construct the conical surface shape of the Christmas tree, the light and high strength advantage of the cable dome structure can greatly reduce the construction materials of the structure with the shape, the bearing of a lower structure can also be greatly reduced, the design difficulty of the whole structure can be reduced due to the reduction of dead weight, and the economic efficiency of the structure can be improved. Therefore, the invention provides the rotary cone sunflower-shaped cable dome which is used for enriching the variety of the cable dome. When the cable dome is rich in types, the cable dome can be completely applied to structures with peculiar appearance and strict requirements on structural dead weight (such as roofs of buildings, partial roofs in mail wheels, offshore airports, offshore cities, offshore amusement parks, water hotels and the like).
Disclosure of Invention
The invention aims to provide a rotary cone sunflower-type cable dome so as to realize expansion and application of the cable dome in a structure with a rotary cone shape.
In order to achieve the above purpose, the invention provides a rotary cone sunflower-shaped cable dome structure. The invention consists of a circumferential stay cable (1), a vertical compression bar (2), an oblique upward stay cable (3), an oblique downward stay cable (4) and a node (5).
According to the rotary cone sunflower-type cable dome structure, the cable nets formed by mutually connecting the oblique upward stay cables (3) form the rotary cone shape meeting the whole structural requirement.
On the appearance curved surface of the structure, the generatrix of the conical surface is a straight line, the curvature of the generatrix is zero, the generatrix is also the warp of the rotary conical surface, the wire of the rotary conical surface is a circular ring, the curvature of the wire is larger than zero, the wire is also the weft of the rotary conical surface, and the sunflower-shaped cable dome of the rotary conical surface is a typical representative of a cable dome with zero Gaussian curvature.
Except for the midspan vertical compression bar (2), the lower end nodes (5) of the rest vertical compression bars (2) are connected with 2 non-collinear oblique downward stay cables (4) and 2 non-collinear circumferential stay cables (1), and the upper end nodes (5) are connected with 4 non-collinear oblique upward stay cables (3) and 2 non-collinear oblique downward stay cables (4); the oblique downward stay cables (4) of the same circle are connected end to end, the oblique downward stay cables (4) of different circles are not connected with each other, and the oblique downward stay cables (4) of the same circle are in the shape of a broken line ring on plane projection, so that the torsion resistance of the rotating curved surface structure is enhanced; the end-to-end connection of each ring of circumferential guy ropes (1) forms a polygon, and the number of the edges of the polygon is equal to the number of support nodes of the structure; the upper end node (5) and the lower end node (5) of the midspan vertical compression bar (2) are respectively connected with the oblique upward stay cable (3) and the oblique downward stay cable (4) only, the number of the connected oblique upward stay cables (3) and the number of the connected oblique downward stay cables (4) are equal, and the number of the support nodes is equal to that of the support nodes of the structure.
The same circle of oblique upward stay cables (3) are connected end to end in a mode of folding lines through joints (5) in a plane projection mode, the oblique upward stay cables (3) of two adjacent circles are connected with each other through the joints (5), all the oblique upward stay cables (3) finally form a rotary conical surface sunflower-shaped cable net formed by n plane projections in a quadrilateral mode, and the rotary conical surface formed by mutually connecting and weaving the oblique upward stay cables (3) in a sunflower-shaped mode enhances the torsion resistance of the rotary conical surface cable dome.
The outer ring of the rotary conical surface sunflower-shaped cable dome structure is fixed on a support node (6) at the periphery by an inclined upper cable (3) and an inclined lower cable (4).
The rotary cone sunflower-shaped cable dome structure needs prestress to be formed to bear external load, and the rotary cone sunflower-shaped cable dome is a mechanism which cannot bear external load when no prestress exists.
The length of each vertical compression bar (2) is determined according to the design result of prestress, each vertical compression bar (2) is scattered in the whole structure in an isolated mode, and the vertical compression bars (2) are kept in a vertical state during forming.
The internal forces of the oblique upward stay cable (3), the oblique downward stay cable (4) and the circumferential stay cable (1) are always tensile forces; the internal force of the vertical compression bar (2) is always pressure, the internal force value of each unit is determined after morphological analysis, and the mutual proportion of the internal force values of each unit is related to the appearance of the structure, the height of the vertical compression bar (2) and the topological relation of the components.
The whole structure is extremely symmetrical, and the number of turns of the circumferential guy cable (1) can be adjusted according to actual conditions on the basis of keeping the rotary conical surface formed by the obliquely upward guy cable (3) unchanged and the structure is extremely symmetrical.
Each fixed node (6) of the outermost ring of the structure is respectively connected with 2 oblique upward inhaul cables (3) and 2 oblique downward inhaul cables (4), the 2 oblique upward inhaul cables (3) are respectively connected to the upper end nodes (5) of two adjacent vertical compression rods (2) of the inner layer, and the head ends and the tail ends of all the oblique upward inhaul cables (3) are positioned at the upper ends of the vertical compression rods (2) or the fixed nodes (6); the 2 inclined downward inhaul cables (4) are respectively connected to the lower end nodes (5) of the inner layer corresponding to the two adjacent vertical compression rods (2), the inclined downward inhaul cables (4) of the same circle are connected end to end, and the inclined downward inhaul cables (4) of different circles are not connected with each other; except for the outer ring, the head and tail ends of all the inclined downward inhaul cables (4) are respectively positioned at the upper ends and the lower ends of different vertical compression bars (2).
The rotary cone sunflower-type cable dome structure can be used for adjusting the length of the whole component by installing the length adjusting device on all the component components, and simultaneously, the prestress of the component can be applied by the length adjusting device.
The rotary conical surface sunflower-type cable dome structure provided by the invention breaks through the current situation that the existing cable dome structure is only suitable for the spherical shell-shaped curved surface or saddle-shaped curved surface. The invention not only has the advantages of light dead weight and high bearing capacity of the traditional cable dome structure, but also widens the application range of the cable dome structure due to the appearance of the rotary conical surface sunflower-shaped cable dome structure. The specific advantages include: light weight, high bearing capacity and good capability of adapting to the building shape of the rotary conical surface. The rotary cone sunflower-shaped cable dome structure can be used in various building structures (including large-span structures such as stadiums, terminal buildings and railway station houses) and ocean engineering structures (including offshore airport terminal buildings, offshore cities, water amusement parks and water hotels) with strict control of structural dead weight requirements.
Drawings
The invention is described in detail below with reference to the attached drawing figures and the detailed description:
FIG. 1a is a three-dimensional schematic of the present invention.
FIG. 1b is a schematic view of a lower cable bar of the present invention that does not include a diagonal upward cable (3).
FIG. 1c is a schematic view of a sunflower-type cable net composed of only the oblique upward stay cable (3) in the present invention.
FIG. 1d is a schematic view of a part of the structure of the present invention after a cover is added.
Fig. 2a is a top view of the present invention.
Fig. 2b is a top view of the circumferential cable (1) only according to the present invention.
Fig. 2c is a schematic view of the invention with only a stay down cable (4).
Fig. 3 is a three-dimensional view of the present invention with a cover added.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings.
The invention relates to a rotary conical surface sunflower-type cable dome, which mainly solves the limitation that the traditional cable dome structure can only be used for spherical shell curved surfaces with positive Gaussian curvature and saddle surfaces with negative Gaussian curvature, and effectively widens the application range of the cable dome structure on the basis of ensuring light dead weight and high bearing capacity of the cable dome structure.
As shown in fig. 1, 2 and 3, the rotary cone sunflower-shaped cable dome mainly comprises an oblique upward cable (3), an oblique downward cable (4), a circumferential cable (1) and a vertical compression bar (2).
As shown in fig. 1, 2 and 3, the upper ends of the rest vertical compression bars except the midspan vertical compression bar (2) are connected with the oblique upward stay cable (3) and the oblique downward stay cable (4), the lower ends of the rest vertical compression bars are connected with the oblique downward stay cable (4) and the circumferential stay cable (1), the circumferential stay cables (1) are connected end to form a closed space curve, and the horizontal plane projection of the space curve is polygonal. In the actual structure, the circumferential guy cable (1) can be manufactured according to the distance between two adjacent nodes, and can also be manufactured according to the length of the whole closed space curve as one guy cable. The number of turns of the looped-cord in the structure is determined according to the span of the specific project.
As shown in fig. 1, 2 and 3, the outer ring oblique upward stay cable (3) and the oblique downward stay cable (4) are connected to the peripheral support nodes (6). Depending on the particular configuration, the support nodes may be located on boundaries of any polygon in plan projection.
As shown in fig. 1, 2 and 3, after all the oblique upward inhaul cables (3), the oblique downward inhaul cables (4), the circumferential inhaul cables (1) and the vertical compression bars (2) are assembled and fixed on the peripheral support nodes (6), after a certain prestress is applied to each inhaul cable and each compression bar through the change of the length, the whole structure can enter a bearing state. The internal forces of the oblique upward inhaul cable (3), the oblique downward inhaul cable (4) and the annular inhaul cable (1) are always tensile forces; the internal force of the vertical compression bar (2) is always pressure.
The sunflower-shaped cable dome with the rotary conical surface has the advantages of reasonable stress and light dead weight; in addition, the invention breaks through the limitation that the original cable dome structure can only be used for structures with positive Gaussian curvature and negative Gaussian curvature, and widens the application range of the cable dome structure. Therefore, the high-efficiency structure system of the cable dome structure can be used in structures with strict self-weight requirements (such as ocean engineering structures and the like).
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be appreciated by those skilled in the art that the foregoing description is merely illustrative of the principles of this invention, and that various modifications and improvements can be made in the invention without departing from its spirit and scope, and these modifications and improvements fall within the scope of the invention as hereinafter claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A rotary cone sunflower type cable dome structure is characterized in that,
comprises a plurality of circumferential inhaul cables (1), a plurality of vertical compression bars (2), a plurality of oblique upward inhaul cables (3) and a plurality of oblique downward inhaul cables (4); the upper end of the vertical compression bar (2) is connected with the oblique upward stay cable (3) and the oblique downward stay cable (4), and the lower end of the vertical compression bar is connected with the oblique downward stay cable (4) and the circumferential stay cable (1); the curved surface of a rope net formed by a plurality of oblique upward inhaul cables (3) is a rotary conical surface, the generatrix of the conical surface is a straight line, the curvature of the generatrix is zero, the generatrix is also a warp of the rotary conical surface, the wire of the rotary conical surface is a circular ring, the curvature of the wire is larger than zero, the wire is also a weft of the rotary conical surface, and the sunflower-shaped rope dome of the rotary conical surface is a zero Gaussian curvature rope dome; the same circle of oblique upward stay cables (3) are connected end to end in a form of broken lines by plane projection through nodes (5), the oblique upward stay cables (3) of two adjacent circles are connected with each other by the nodes (5), and finally a rotary conical surface sunflower-shaped cable net consisting of n planes projected into quadrangles is constructed, and the rotary conical surfaces formed by mutually connecting and weaving the oblique upward stay cables (3) in a sunflower-shaped mode strengthen the torsion resistance of the rotary conical surface cable dome; except for the midspan vertical compression bar (2), the lower end node (5) of the rest vertical compression bar (2) is connected with 2 non-collinear oblique down-stay cables (4) and 2 non-collinear annular stay cables (1); the oblique downward stay cables (4) of the same circle are connected end to end, the oblique downward stay cables (4) of different circles are not connected with each other in a broken line circular shape on plane projection, and the oblique downward stay cables (4) of the same circle are connected with each other in a broken line circular shape on plane projection, so that the torsion resistance of the rotary conical surface structure is also enhanced; the end-to-end connection of each ring of circumferential guy ropes (1) forms a polygon, and the number of the edges of the polygon is equal to the number of support nodes of the structure; meanwhile, the upper end nodes (5) of other vertical compression bars (2) except the midspan vertical compression bar (2) are connected with 4 non-collinear oblique upward stay cables (3) and 2 non-collinear oblique downward stay cables (4); the upper end node (5) and the lower end node (5) of the midspan vertical compression bar (2) are respectively connected with the oblique upward stay cable (3) and the oblique downward stay cable (4), the number of the connected oblique upward stay cables (3) and the number of the connected oblique downward stay cables (4) are equal, and the number of the connected oblique upward stay cables is equal to the number of support nodes of the structure.
2. The rotary cone sunflower-type cable dome according to claim 1, characterized in that 2 oblique upward cables (3) and 2 oblique downward cables (4) are hinged three-way on the same support node (6).
3. The rotary cone sunflower-shaped cable dome according to claim 1, wherein the structure is formed by pretensioning, so that the oblique upward cable (3), the oblique downward cable (4) and the circumferential cable (1) generate a tensile internal force, and the vertical compression bar (2) generates a compressive internal force; the force value in the unit is determined by a morphological analysis method; when pretension is not carried out, the rotary cone sunflower-shaped cable dome is a mechanism and cannot be used as a bearing structure.
4. The rotary cone sunflower-type cable dome according to claim 1, wherein the length of the vertical compression rods (2) is determined according to the design result of the prestress, each vertical compression rod (2) is independently dispersed in the whole structure, and each vertical compression rod (2) cannot be directly connected with each other.
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| CN201910042540.9A CN109750781B (en) | 2019-01-17 | 2019-01-17 | Rotary conical surface sunflower type cable dome |
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| CN201910042540.9A CN109750781B (en) | 2019-01-17 | 2019-01-17 | Rotary conical surface sunflower type cable dome |
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| CN109750781B true CN109750781B (en) | 2023-10-31 |
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| CN114826097A (en) * | 2022-04-30 | 2022-07-29 | 上海刊宝科技有限公司 | Disk-shaped offshore photovoltaic power generation device based on tension entirety and installation method |
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