Large-span space circular ring structure

Abstract

The invention discloses a large-span space circular ring structure. The large-span space circular ring structure comprises a circular ring main body structure composed of an inverted triangular space ring truss, a variable cross-section cantilever beam and a floor slab. The C-shaped opening cross section is adopted, an outer ring vertical structural member is omitted, and a 360-degree unshielded annular view is provided for a building. The inverted triangular space ring truss is adopted, the special space function of the inverted triangular space ring truss is exerted, excellent structural bending resistance and torsion resistance are shown, and the requirement for safety of a large-span structure is met. By means of the design of the variable-cross-section cantilever beam, structural distribution is matched with bending moment distribution, and the suspension mass of the cantilever end is reduced. While the structural safety is ensured, the steel consumption is effectively controlled, and the material cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of building technology, and specifically to a large-span spatial ring structure. Background Technology

[0002] As modern architectural aesthetics and functional requirements continue to rise, large-span, especially mega-ring-shaped spatial structures, are increasingly becoming the preferred form for high-rise building complexes and new urban landmarks due to their stunning visual impact and ability to provide unparalleled 360-degree panoramic views. Such structures typically tower above multiple towers, forming a vast high-altitude "halo" or "sky corridor."

[0003] Existing designs for large-span circular structures mainly fall into two technical categories: The first category employs a closed-section cylindrical or box-shaped structure, or a dense vertical support system symmetrically arranged inside and outside the ring. This type of design boasts high overall structural rigidity and well-defined mechanical properties, but the densely packed support members on the outer side severely obstruct the view, making the building appear bulky and contradicting the modern design philosophy of pursuing ultimate transparency. The second category utilizes open designs to improve visibility, typically using only a single row of columns or conventional planar trusses or quadrilateral space trusses for support on the inner side. While this approach partially liberates the view, its structural torsional stiffness relies heavily on the torsional capacity of the components themselves, resulting in lower efficiency. To meet stiffness requirements, this often leads to larger component cross-sections and increased steel consumption, and consequently, the achievable safe span is usually limited to within 100 meters, making it difficult to overcome the bottleneck of balancing scale and view.

[0004] Furthermore, while existing technologies have made improvements to the connection structure between multi-tower and ring structures (such as using hybrid hinges and sliding supports), these improvements are all aimed at optimizing the performance of the "connection interface" and do not address the fundamental innovations in the torsional resistance mechanism and lightweighting of the ring structure itself.

[0005] Therefore, there is an urgent need in this field for a novel ring structure system that can overcome the above contradictions at the structural level. That is, under the premise of completely eliminating the outer vertical support components to obtain an absolute panoramic view, it can achieve a significant leap in torsional stiffness and spanning capacity through innovative structural topology and force transmission mechanism, thereby supporting the realization of giant ring buildings with a diameter of 150 meters or even larger. Summary of the Invention

[0006] Purpose of the invention: In order to solve the problems existing in the prior art, the present invention provides a large-span spatial ring structure that achieves complete transparency on the outside in architecture and a highly efficient "axial force anti-torsion" mechanism in structure, thereby synergistically achieving ultra-large span and excellent structural performance.

[0007] Technical solution: To achieve the above objectives, the present invention may adopt the following technical solution: a large-span spatial ring structure, comprising a main ring structure composed of an inverted triangular spatial ring truss, variable cross-section cantilever beams, and floor slabs; The main ring structure is formed by wrapping around the central axis to form a closed ring body, and the cross-section has a C-shaped opening structure, with the C-shaped opening facing the radially outward side of the main ring structure; The inverted triangular spatial ring truss is a closed ring spatial truss, arranged along the circumference of the main ring structure, with an inverted triangular cross-section, and fixedly connected to the inner side of the C-shaped opening; the inverted triangular spatial ring truss includes a chord system and a web system, the chord system includes a lower chord extending along the circumference and two upper chords located above the lower chord and extending along the circumference, and the web system connects the upper chords and the lower chords; The variable cross-section cantilever beam unit includes multiple floor cantilever beams and multiple roof cantilever beams. The root of each cantilever beam is rigidly connected to the chord of the inverted triangular spatial ring truss and extends radially outward to the edge of the C-shaped opening. The variable cross-section cantilever beam and the floor slab above it bear the vertical load. The inverted triangular spatial ring truss transforms the torque generated by the cantilever action from the variable cross-section cantilever beam and the floor slab above it into the circumferential tension of the upper chord and the circumferential pressure of the lower chord through its circular closed path, so that the structure as a whole mainly resists the torque through axial force.

[0008] Furthermore, the two upper chords are located on concentric circles of different radii in the horizontal projection, including the inner upper chord and the outer upper chord.

[0009] Furthermore, the inverted triangular spatial ring truss is continuously and uninterruptedly arranged in the circumferential direction of the main ring structure.

[0010] Furthermore, the web member system includes diagonal web members and horizontal web members, with the diagonal web members connecting the upper chord and the lower chord; and the horizontal web members connecting the two upper chords.

[0011] Furthermore, the chord system and web system of the inverted triangular spatial ring truss are both box-section members, with longitudinal stiffening ribs arranged axially inside.

[0012] Furthermore, in the connection node area between the root of the variable cross-section cantilever beam and the chord system, the box-section member is also provided with transverse stiffening ribs.

[0013] Furthermore, the variable cross-section cantilever beams are radially and uniformly distributed in the radial direction of the main ring structure.

[0014] Furthermore, the cross-sectional height of the floor cantilever beam and the roof cantilever beam in the variable cross-section cantilever beam decreases linearly from the connection root to the cantilever free end.

[0015] Furthermore, the outer diameter of the main ring structure is up to 150 meters, and the inner diameter is up to 120 meters; and the maximum straight-line span between any two building load-bearing supports below the main ring structure is 95 meters.

[0016] Furthermore, the inverted triangular spatial ring truss and the variable cross-section cantilever beam, together with the floor slab above it, constitute a structural module unit that can be independently transported, hoisted, and combined with other building load-bearing supports.

[0017] Beneficial effects: The present invention has the following advantages: (1) By adopting a C-shaped open cross section, the outer ring vertical structural members are eliminated, providing the building with a 360° unobstructed circular view. Although the stiffness of the open scheme is reduced compared to the closed scheme, the present invention utilizes the space function through the optimized design of the inner ring inverted triangular space truss, successfully compensating for the stiffness loss, demonstrating excellent structural performance, and meeting the safety requirements of large-span structures. (2) Compared with the planar truss scheme, the present invention uses an inverted triangular space truss, which reduces the structural deformation by about 20%. The present invention makes full use of the stability of the space triangle, with about 80% of the torque being borne by the overall spatial axial force of the truss, and only about 20% of the torque being borne by the chord members themselves, greatly optimizing the stress state of the members. (3) The present invention uses a variable cross section cantilever beam design to match the structural distribution with the bending moment distribution, reducing the suspended mass at the cantilever end. While ensuring structural safety, the amount of steel used is effectively controlled, reducing material costs. (4) The stress is clear, the design of key nodes is targeted, and the modular unit concept supports factory prefabrication and efficient on-site assembly, which significantly improves the quality of the project and the construction speed. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a large-span spatial ring structure according to a specific embodiment of the present invention; Figure 2 This is a schematic diagram of the force direction of a local spatial ring structure in a specific embodiment of the present invention; Figure 3 for Figure 1 A schematic diagram of the cross-sectional structure along the AA direction; Figure 4 This is a schematic diagram of the inverted triangular space truss structure in a specific embodiment of the present invention; Figure 5 This is a schematic diagram of the distribution structure of transverse stiffening ribs and longitudinal stiffening ribs in a specific embodiment of the present invention; Figure reference numerals: 1-Circular main structure, 2-Cantilever beam of the lower floor of the circular ring, 3-Cantilever beam of the upper roof of the circular ring, 4-Lower chord, 5-Outer upper chord, 6-Inner upper chord, 7-Diagonal web member, 8-Horizontal web member, 9-Transverse stiffening rib, 10-Longitudinal stiffening rib. Detailed Implementation

[0019] To make the technical features and effects of the present invention easier to understand, the following embodiments, in conjunction with the accompanying drawings, provide a more detailed explanation of the structure and usage principles of the large-span spatial ring structure and modular building of the present invention.

[0020] Please refer to Figure 1-5 As shown, this embodiment provides a large-span spatial ring structure. This structure is a complete closed ring, with the outer diameter of its main ring structure 1 being 150 meters and the inner diameter 120 meters. To achieve an unobstructed view, the main ring structure 1 is installed on the floors of four buildings (not shown), serving as load-bearing supports. The maximum straight-line span between any two adjacent supports reaches 95 meters, successfully creating an ultra-large span column-free space. The main ring structure 1 forms a closed ring around a central axis, and its cross-section has a C-shaped opening, with the C-shaped opening facing radially outward from the main ring structure 1.

[0021] The structure includes an inverted triangular spatial ring truss, a variable cross-section cantilever beam, and a floor slab above it. The inverted triangular spatial ring truss is a closed ring spatial truss, which is the core load-bearing and torsional resistance center. It is continuously and uninterruptedly arranged along the circumference of the main ring structure, with an inverted triangular cross-section, and is fixedly connected to the inside of the C-shaped opening to form a closed and powerful "bending and torsional resistance ring".

[0022] The inverted triangular spatial ring truss comprises a chord system and a web system. The chord system includes a lower chord 4 extending circumferentially and two upper chords (inner upper chord 6 and outer upper chord 5) located above the lower chord 4 and extending circumferentially. The two upper chords are located on concentric circles of different radii in their horizontal projection. The lower chord 4, the inner upper chord 6, and the outer upper chord 5 together form a stable inverted triangular cross-section. The web system connects the upper chords and the lower chord 4 and includes diagonal web members 7 connecting the upper and lower chords and horizontal web members 8 connecting the two upper chords.

[0023] The chord and web member systems of the inverted triangular spatial ring truss are both box-section members, with longitudinal stiffeners 10 arranged axially inside to prevent local buckling of the plates. Please refer to [reference needed] for details. Figure 5As shown, the entire inverted triangular space truss system connects the upper and lower chords into a whole through the web system, which together bear bending moment, shear force, and torque, and ensures the geometric invariance of the inverted triangular section, providing excellent in-plane and out-of-plane stiffness.

[0024] The variable cross-section cantilever beams and the floor slab above them directly bear the vertical loads, converting the loads into torques that are transmitted to the inner ring truss. These variable cross-section cantilever beams are radially and evenly distributed in multiple groups along the radial direction of the main ring structure. Each group consists of a lower ring floor cantilever beam 2 and an upper ring roof cantilever beam 3, supporting the floor and roof respectively. The roots of each cantilever beam are rigidly connected to the chord of the inverted triangular spatial ring truss, extending radially outward to the edge of the C-shaped opening. In the connection node area between the root of the variable cross-section cantilever beam unit and the chord system, the box-section member also has transverse stiffening ribs 9, welded to the longitudinal stiffening ribs 10 inside the chord, forming a robust three-dimensional stiffening system that ensures the safe and uniform diffusion and transmission of the enormous bending moment, shear force, and torque at the beam end to the entire cross-section of the chord. The cross-sectional height of the floor and roof cantilever beams in the variable cross-section cantilever beams decreases linearly from the connection root towards the free end of the cantilever.

[0025] Working principle: In this embodiment of the invention, the outer upper chord 5 and the inner upper chord 6 mainly bear circumferential tensile force, while the lower chord 4 mainly bears circumferential compressive force. The variable cross-section cantilever beam and the floor slab above it bear the vertical load. The inverted triangular spatial ring truss transforms the torque generated by the cantilever action transmitted from the variable cross-section cantilever beam into the circumferential tensile force of the upper chord 5 and the circumferential compressive force of the lower chord through its circular closed path, so that the entire structure mainly resists the torque through axial force.

[0026] Compared with the conventional planar ring truss scheme, the inverted triangular space truss scheme of the present invention reduces the overall structural deformation by about 20%.

Claims

1. A large-span spatial ring structure, characterized in that: The main structure consists of an inverted triangular spatial ring truss, variable cross-section cantilever beams, and floor slabs. The main ring structure is formed by wrapping around the central axis to form a closed ring body, and the cross-section has a C-shaped opening structure, with the C-shaped opening facing the radially outward side of the main ring structure; The inverted triangular spatial ring truss is a closed ring spatial truss, arranged along the circumference of the main ring structure, with an inverted triangular cross-section, and fixedly connected to the inner side of the C-shaped opening; the inverted triangular spatial ring truss includes a chord system and a web system, the chord system includes a lower chord extending along the circumference and two upper chords located above the lower chord and extending along the circumference, and the web system connects the upper chords and the lower chords; The variable cross-section cantilever beam includes multiple floor cantilever beams and multiple roof cantilever beams. The root of each cantilever beam is rigidly connected to the chord of the inverted triangular spatial ring truss and extends radially outward to the edge of the C-shaped opening. The variable cross-section cantilever beam and the floor slab above it bear the vertical load. The inverted triangular spatial ring truss transforms the torque generated by the cantilever action from the variable cross-section cantilever beam unit and the floor slab above it into the circumferential tension of the upper chord and the circumferential pressure of the lower chord through its circular closed path, so that the structure as a whole mainly resists the torque through axial force.

2. The large-span spatial ring structure according to claim 1, characterized in that: The two upper chords are located on concentric circles of different radii in the horizontal projection, including the inner upper chord and the outer upper chord.

3. The large-span spatial ring structure according to claim 1 or 2, characterized in that: The inverted triangular spatial ring truss is continuously and uninterruptedly arranged in the circumferential direction of the main ring structure.

4. The large-span spatial ring structure according to claim 1, characterized in that: The web member system includes diagonal web members and horizontal web members. The diagonal web members are connected between the upper chord and the lower chord. The horizontal web members are connected between the two upper chords.

5. The large-span spatial ring structure according to claim 1, characterized in that: The inverted triangular spatial ring truss has a chord system and a web system that are both box-section members with longitudinal stiffening ribs arranged axially inside.

6. The large-span spatial ring structure according to claim 5, characterized in that: In the connection node area between the root of the variable cross-section cantilever beam unit and the chord system, the box-section member is also provided with transverse stiffening ribs.

7. The large-span spatial ring structure according to claim 1, characterized in that: The variable cross-section cantilever beams are evenly distributed radially in the radial direction of the main ring structure.

8. The large-span spatial ring structure according to claim 1 or 7, characterized in that: The cross-sectional height of the floor cantilever beam and the roof cantilever beam in the variable cross-section cantilever beam decreases linearly from the connection root to the cantilever free end.

9. The large-span spatial ring structure according to claim 1, characterized in that: The outer diameter of the main ring structure is up to 150 meters, and the inner diameter is up to 120 meters; and the maximum straight-line span between any two building load-bearing supports below the main ring structure is 95 meters.

10. The large-span spatial ring structure according to claim 1, characterized in that: The inverted triangular spatial ring truss, the variable cross-section cantilever beam, and the floor slab above it together constitute a structural module unit that can be independently transported, hoisted, and combined with other building load-bearing supports.

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