Narrow frame structure of super-high and large-span single-layer cable net curtain wall

Abstract

The application discloses a narrow frame structure for supporting a super-high and large-span single-layer cable net curtain wall, which is provided with a cable net for hanging a glass curtain wall, frame columns on two sides of the single-layer cable net curtain wall, a top frame beam and a bottom frame beam, and a core tube with strong lateral resistance, wherein the frame columns on the two sides of the single-layer cable net curtain wall and the top and bottom frame beams constitute the narrow frame structure of the single-layer cable net curtain wall. The narrow frame structure of the super-high and large-span single-layer cable net curtain wall is provided with horizontal trusses for connecting the frame columns and the core tube in a floor plane; a cantilever truss is arranged in the core tube to form a top multi-span frame beam structure for resisting the pressure of vertical cables; by using the targeted structural arrangement, the safety of the structure is ensured, the building function and use requirements are met, and a more spacious internal support space is provided.

Description

Technical Field

[0001] This invention relates to a structure in the field of architecture, and more particularly to a structure for supporting a multi-story, ultra-high, large-span single-layer cable-net curtain wall, especially a solution for a narrow-frame support structure. Background Technology

[0002] Existing cable-stayed structures are mainly used in large-span stadiums, where a strong ring beam is used to balance the cables around the perimeter. In recent years, cable-stayed curtain walls have become increasingly popular among architects and designers due to their transparency and aesthetic appeal, and are gradually being applied and implemented in high-rise and super high-rise buildings.

[0003] The transparency of cable-stayed curtain walls lies in their large span, with glass curtain walls suspended on the outside of the cables, achieving an overall aesthetically pleasing appearance and providing a good lobby visual effect from the interior. In high-rise buildings, cable-stayed curtain walls need to maintain a certain level of stiffness under wind loads, thus requiring prestressing of the cables. To meet the tensioning support conditions for the large tension forces of the cables, reinforced concrete core tubes or shear walls are often set at both ends of the cables. The reinforced concrete core tube provides sufficient lateral stiffness to meet the boundary conditions for cable tensioning, resulting in a longer wall length, the so-called wide-frame structure. However, while this structure meets the load-bearing requirements of the cable-stayed curtain wall, the large and heavy shape of the core tube affects the space within the glass curtain wall. The building facade also requires special decoration of the core tube, leading to a visually oppressive and constricting feeling within the glass curtain wall space, affecting the connection between the building's interior and exterior spaces. Therefore, the existing technology still needs improvement and development. Summary of the Invention

[0004] The purpose of this invention is to provide a narrow frame structure for an ultra-high, large-span single-layer cable net curtain wall. In response to the problems of the prior art, this invention provides a narrow frame large-space cable net curtain wall building structure to meet the needs of a more spacious lobby space while ensuring the safety and load-bearing capacity of the curtain wall.

[0005] The technical solution of the present invention is as follows:

[0006] A narrow-frame structure for an ultra-high, large-span single-layer cable-net curtain wall is provided, which is equipped with cable nets for hanging glass curtain walls, side frame columns (also called frame columns), top frame beams and bottom frame beams of the single-layer cable-net curtain wall, and a core tube providing strong lateral resistance is also provided in the floor. The side frame columns and frame beams of the single-layer cable-net curtain wall constitute the narrow-frame structure of the single-layer cable curtain wall.

[0007] The narrow frame structure of the ultra-high, large-span single-layer cable net curtain wall includes horizontal trusses in each floor slab within the height of the cable net curtain wall. The horizontal trusses connect the frame columns of the curtain wall to the core tube as a whole. Horizontal cables are provided at the ends where the horizontal trusses connect to the frame columns, and vertical cables are provided perpendicular to the horizontal cables. The horizontal cables are supported on the frame columns on both sides, and the vertical cables are supported on the top frame beam and the bottom frame beam.

[0008] The narrow frame structure of the ultra-high, large-span single-layer cable net curtain wall is described above, wherein the horizontal cables are set close to the outer frame columns, and the vertical cables are set outside the horizontal cables and closer to the glass curtain wall.

[0009] The narrow frame structure of the ultra-high, large-span single-layer cable net curtain wall, wherein the horizontal cables are used to bear horizontal forces, and the vertical cables are used to bear the weight of the cables and the glass itself.

[0010] The narrow frame structure of the ultra-high, large-span single-layer cable net curtain wall includes in-plane horizontal trusses set at the floor level for the side frame columns and the core tube, in order to avoid the side frame columns being too weak to serve as supports for the tensioning and prestressing of the horizontal cables.

[0011] The narrow frame structure of the ultra-high, large-span single-layer cable net curtain wall, wherein the intersection of the axes of the two diagonal members of the horizontal truss connected to the frame column is collinear with the endpoint of the horizontal cable.

[0012] The narrow frame structure of the ultra-high, large-span single-layer cable net curtain wall includes multiple cantilever trusses extending from the core tube structure to support the top frame beam, forming a multi-span continuous beam structure. This enhances the bending stiffness and load-bearing capacity of the top frame beam, making it a better support for the tensioning of vertical cables.

[0013] The narrow frame structure of the ultra-high, large-span single-layer cable net curtain wall, wherein the vertical cables exert an upward force on the bottom frame beams, therefore, by setting vertical trusses or steel columns, the integrity of the bottom two-story structure is improved, and it is easier to better utilize the self-weight of the two-story floor slab to balance the upward tension of the vertical cables.

[0014] The narrow frame structure of the ultra-high, large-span single-layer cable net curtain wall includes clamps for the glass curtain wall at the intersection of the horizontal and vertical cables.

[0015] The narrow frame structure of the ultra-high, large-span single-layer cable net curtain wall, wherein both the horizontal and vertical cables are pre-tensioned to ensure that the cable units have the necessary initial geometric stiffness.

[0016] This invention provides a narrow-frame structure for an ultra-high, large-span single-layer cable-net curtain wall. By installing horizontal trusses connecting the frame columns and the core tube within the floor slab, the tension of the horizontal cables achieves self-balancing within the floor structure. At the top, cantilever trusses form a multi-span frame beam structure from within the core tube to resist the pressure of the vertical cables. At the bottom, interlayer trusses and steel columns utilize the self-weight of the two-layer structure to balance the upward tension of the vertical cables. Through these targeted structural arrangements, and by analyzing the structural force transmission mechanism, calculating and verifying the strength and stiffness of the structural components, the invention ultimately ensures structural safety while meeting architectural functions and usage requirements, providing a more spacious internal support space. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the internal structure of the curtain wall, which is a preferred embodiment of the narrow frame structure of the ultra-high, large-span single-layer cable net curtain wall of the present invention.

[0018] Figure 2 This is a schematic diagram of the horizontal truss structure of a preferred embodiment of the narrow frame structure of the ultra-high, large-span single-layer cable net curtain wall described in this invention.

[0019] Figure 3 This is a schematic diagram showing the connection between the truss inclined member connected to the frame column and the horizontal cable in a preferred embodiment of the narrow frame structure of the ultra-high, large-span single-layer cable net curtain wall of the present invention.

[0020] Figure 4 This is a schematic diagram of the cantilever truss and top frame beam of the core tube in a preferred embodiment of the narrow frame structure of the ultra-high, large-span single-layer cable net curtain wall of the present invention.

[0021] Figure 5 This is a schematic diagram showing the connection between the cantilever truss's inclined members, the top frame beam, and the vertical cables in a preferred embodiment of the narrow frame structure of the ultra-high, large-span single-layer cable net curtain wall described in this invention.

[0022] Figure 6 This is a schematic diagram of the vertical cable bottom connection structure of a preferred embodiment of the narrow frame structure of the ultra-high, large-span single-layer cable net curtain wall of the present invention. Detailed Implementation

[0023] The preferred embodiments of the present invention will be described in detail below.

[0024] The present invention provides a narrow-frame structure for a single-layer cable-net curtain wall of ultra-high spans. In a preferred embodiment, it offers a superior solution to existing cable-net curtain wall structures in buildings, providing a more open interior space while ensuring a transparent facade. For ultra-high-rise buildings, such as office buildings exceeding 100 meters in height, when cable-net curtain walls are installed, a safe and reliable support structure is required to facilitate the use of interior space, especially necessitating a narrow-frame structure to support the cable-net curtain wall structure.

[0025] like Figure 1 As shown in the preferred embodiment of the ultra-high, large-span single-layer cable-net curtain wall of the present invention, a single-layer cable-stayed curtain wall structure is adopted in the building, presenting a light and transparent architectural effect inside. Clamps 122 for fixing the glass curtain wall are set at the intersection point 121 of the horizontal cables 110 and the vertical cables 120. Figure 1 The diagram only shows one horizontal cable and one vertical cable. They are usually fixed with a cross-shaped fastener and extend towards the glass curtain wall with a support rod. A fixing or suction cup structure is installed at the top of the support rod.

[0026] In a preferred embodiment of the present invention, the size ratio of the cable-stayed curtain wall is typical of unidirectional stress. Considering the shrinkage and creep effect of the reinforced concrete core tube under long-term load, the single-layer cable-stayed curtain wall relies on the horizontal cables to bear the load under the action of horizontal force, while the vertical cables only bear the self-weight load of the cables, glass and other components.

[0027] In the preferred embodiment of the present invention, the cable-stayed curtain wall has limited boundary conditions and is a narrow frame, which does not meet the conditions for setting up components with large in-plane stiffness. That is, the frame stiffness is weak. Therefore, the support structure for the cables needs to be specially designed and constructed to form a sufficiently safe structure.

[0028] like Figure 2 As shown, the narrow frame sides of the curtain wall of this invention are only provided with a single frame column. Obviously, for each cable that needs to provide a large tensile force, the frame column has weak stiffness and cannot meet the tensioning and fixing requirements of the cable. Therefore, it is necessary to rely on a reinforced concrete core tube with high overall stiffness to achieve the boundary stiffness requirements of cable tensioning. Therefore, a horizontal truss is set in each floor slab to form a whole with the frame column and the core tube 200 to jointly bear the horizontal cable force. The horizontal truss arrangement in this embodiment of the invention is as follows. Figure 2 As shown. In a single-story floor section view, some members 210 of the horizontal truss bear both vertical loads and horizontal cable forces, while some members 220 bear only horizontal cable forces. For the latter, the design separates these members from the steel truss floor slab. To ensure the reliability of the floor slab load transfer of the horizontal truss, structural steel sections are also installed around the core tube to ensure the integrity of the force flow.

[0029] Meanwhile, the steel pipe columns bear horizontal cable forces in the middle of the floor. Due to the eccentric arrangement of the cables and frame columns, the frame columns will bear a large torque, which will continuously accumulate along the floor height. Therefore, in order to increase the torsional stiffness of the edge columns and coordinate the stress and deformation of the top frame beams, square steel pipe concrete columns are used for the edge frame columns, and the planar arrangement of the square steel pipe concrete columns is parallel to the curtain wall surface.

[0030] In actual embodiments, the narrow frame on both sides of the curtain wall of the present invention is provided with only a single frame column. In the standard floor of the tower, a round steel tube concrete column can be used to transform from the round steel tube column at the bottom to the square steel tube column at the top. The centroids of the upper and lower sections do not coincide. Therefore, a transformation node with a round column to a square column and a smaller lower section and a larger upper section is designed. Related studies have shown that this node transmits force directly and has the bearing capacity to resist rare earthquakes.

[0031] In a further embodiment, horizontal trusses are installed at the floor level to enhance the stiffness of the square steel tube concrete columns (hereinafter referred to as "frame columns"). To reduce the additional torque on the frame columns caused by the eccentric connection between the cables and the frame columns, the structural countermeasure of this embodiment is to ensure that the intersection point of the cross-sectional axes of the two truss members directly connected to the frame columns is collinear with the cables, such as... Figure 3 As shown.

[0032] To verify the effectiveness of the novel node in reducing torque in the preferred embodiment of the present invention, two methods were used for simulation and verification: In the model, the frame column cross-section was 1400×1400 mm, the steel grade was Q390GJ, and the length was 4.5m (the story height). The steel beam cross-section was B600×400×20×20 mm, the steel grade was Q355B. A 1m long rigid rod was installed outside the frame column, and a horizontal force of 1200kN was applied every 2.25m. The effect of the floor slab was ignored in the model. The resultant force of the two horizontal members acted on the centroid of the frame column. One method was to specify the insertion point to ensure the resultant force of the two horizontal members was collinear with the cable; the other method was to directly connect the horizontal members to the cable's point of action. The calculation results showed that the stress magnitude and distribution, and node deformation of the components obtained by these two methods were basically the same, and both were smaller than those of conventional nodes. This indicates that the novel node of the present invention can effectively reduce the magnitude of torque and improve the uniformity of stress distribution in the components.

[0033] Under the action of horizontal cable forces, the floor slab participates in transmitting part of the horizontal force. When the floor slab experiences significant tensile force, the concrete portion of the floor slab may partially cease functioning. Therefore, it is necessary to study the influence of the in-plane stiffness of the floor slab on the axial force of the horizontal truss. When the in-plane stiffness of the floor slab is taken as 100% (indicating no damage), 70%, 30%, and 10% of the elastic stiffness, the results show that as the stiffness of the floor slab decreases, the axial force of the horizontal truss generally increases. In contrast, the force change of the diagonal members connected to the frame columns is not significant.

[0034] Under the force of the vertical cables, the top frame beam will bear a downward vertical force, and the bottom structure will bear an upward vertical force.

[0035] Vertical cables can also be eccentrically connected to the top frame beams. To improve the stiffness of the top frame beams and control the vertical deformation of the frame, three cantilever trusses (referred to as "cantilever trusses") are evenly spaced at the top of the tower's core tube. Each cantilever truss extends one span into the core tube. Hidden trusses are installed where shear walls are present, and cross-story trusses are installed where there are no shear walls. Figure 4 As shown. Horizontal and vertical supports are installed between each cantilever truss to ensure the spatial integrity of the cantilever truss. After the cantilever truss is installed, the top frame beam changes from a large-span beam to a four-span continuous beam, greatly improving the load-bearing capacity of the side frame beams. That is, under the eccentric action of the vertical cable load, part of the bending moment, shear force, torque, and other internal forces borne by the top side frame beam will be transferred to the core tube through the cantilever truss, and part will be transferred to the side frame columns. When the cantilever truss is connected to the top frame beam, the upper chord of the cantilever truss is eccentrically upward relative to the centroid of the top side frame beam, and the lower chord is eccentrically downward relative to the centroid of the steel beam to reduce the adverse effects of additional torque on the top frame beam, such as... Figure 5 As shown.

[0036] In a preferred embodiment of the present invention, the vertical cables of the curtain wall are located at the bottom plane position between the outer frame columns 310 and the outer edge beams 320. Since the bottom support structure will bear an upward tensile force under the vertical cable force, a vertical truss 311 is added between the outer frame columns 310, and a steel column 321 is added at the outer edge beams 320. Figure 6 As shown, this enhances the vertical stiffness of the base structure of the cable-stayed curtain wall, ensuring good integrity between adjacent floors. The self-weight of the two-story floor structure resists the upward tension generated by the vertical cables, preventing excessive tension from damaging the structure. The cable force at the base of the curtain wall is transferred to the frame beam 330 between the outer edge beam 320 and the outer frame column 310 through the secondary beam 322. The tension is then transmitted downwards through the vertical truss 311 and steel columns 321, and ultimately, most of it is transferred to other frame columns in the lower structure. Under single-load conditions of cable force, the edge columns and vertical trusses bear axial forces. Studies show that the intermediate frame column below the vertical truss experiences slight tension only when the cable force is applied, but this transitions to compression after the superimposed dead load, thus ensuring the safety of the overall structure.

[0037] In a preferred embodiment of the narrow-frame structure of the ultra-high, large-span single-layer cable-net curtain wall described in this invention, to achieve a thin and light effect for the tall curtain wall, the horizontal cables must be tightly attached to the glass curtain wall. This effect results in an eccentric connection between the horizontal cables and the structural frame members. The tension of each horizontal cable will generate torque on the structure and components, and this torque has a cumulative effect along the entire height. How to effectively balance the torsion to ensure structural safety requires skillful handling by structural engineers. In the preferred embodiment of this invention, the resultant force point of the truss diagonal members is collinear with the horizontal cables, thereby effectively reducing the additional torque.

[0038] In a preferred embodiment of the present invention, the structure supporting the cable-stayed curtain wall was meticulously designed. Horizontal trusses were installed at the floor level, and the truss components were rationally designed based on whether they bear vertical loads. The connection nodes between the frame components and the connected truss components were rationally configured, effectively reducing the additional torque caused by cable tension, ensuring that the load-bearing capacity and deformation of the supporting curtain wall structure components are within allowable ranges. The load-bearing capacity of structural components such as horizontal trusses, frame columns, top frame beams, and floor slabs was verified to ensure compliance with specifications. Further research into the influence of the cable-stayed curtain wall on the overall structural stress showed that the conclusion can be directly calculated and analyzed using a pure main structural model. In summary, the rational arrangement of the narrow-frame structure supporting the large-span cable-net curtain wall creates a good structural boundary, realizing the function of the building curtain wall and a larger suspended space effect.

[0039] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A narrow-frame structure for an ultra-high, large-span single-layer cable-net curtain wall, comprising a cable net for suspending the glass curtain wall, side frame columns, top frame beams, and bottom frame beams of the single-layer cable-net curtain wall, and a core tube with sufficient lateral resistance, characterized in that, The frame columns and frame beams on both sides of the single-layer cable net curtain wall form a narrow frame structure for the single-layer cable net curtain wall. The core tube is surrounded by structural steel sections; horizontal trusses are installed in each floor slab within the height of the cable net curtain wall, and the horizontal trusses connect the frame columns of the curtain wall to the core tube as a whole. Horizontal cables are installed at the ends where the horizontal trusses connect to the frame columns, and vertical cables are installed perpendicular to the horizontal cables. Some members of the horizontal trusses bear both vertical loads and horizontal cable forces, while some members only bear horizontal cable forces, and these members are detached from the steel truss floor slabs. The core tube at the top of the tower is provided with three cantilever trusses at equal intervals; when the cantilever trusses are connected to the top frame beam, the upper chord of the cantilever truss is eccentric upward relative to the centroid of the top frame beam, and the lower chord is eccentric downward relative to the centroid of the steel beam. Vertical trusses are added between the outer frame columns, and steel columns are added at the outer edge beams. This allows the tension of the cables at the bottom of the curtain wall to be transferred through the secondary beams to the frame beams between the outer edge beams and the outer frame columns, and then down through the vertical trusses and steel columns, and finally, most of the tension is transferred to the other frame columns of the lower structure.

2. The narrow frame structure of the ultra-high, large-span single-layer cable net curtain wall according to claim 1, characterized in that, The horizontal cables are fastened to the frame columns on both sides, and the vertical cables are fastened to the top frame beam and the bottom frame beam.

3. The narrow frame structure of the ultra-high, large-span single-layer cable net curtain wall according to claim 2, characterized in that, The horizontal cable is set close to the outer frame column, and the vertical cable is set outside the horizontal cable and closer to the glass curtain wall.

4. The narrow frame structure of the ultra-high, large-span single-layer cable net curtain wall according to claim 3, characterized in that, The horizontal cable is used to bear horizontal forces, and the vertical cable is used to bear the weight of the tension cable and the glass itself.

5. The narrow frame structure of the ultra-high, large-span single-layer cable net curtain wall according to claim 4, characterized in that, In-plane horizontal trusses are installed at the corresponding floor positions of the side frame columns and the core tube to avoid the side frame columns being too weak to serve as supports for the horizontal cable tensioning prestressing.

6. The narrow frame structure of the ultra-high, large-span single-layer cable net curtain wall according to claim 5, characterized in that, The intersection of the axes of the two diagonal members of the horizontal truss connected to the frame column is collinear with the endpoint of the horizontal cable.

7. The narrow frame structure of the ultra-high, large-span single-layer cable net curtain wall according to claim 6, characterized in that, Multiple cantilever trusses are cantilevered from the core tube structure to support the top frame beam, forming a multi-span continuous beam structure. This enhances the bending stiffness and load-bearing capacity of the top frame beam, making it a better support for the tensioning of vertical cables.

8. The narrow frame structure of the ultra-high, large-span single-layer cable net curtain wall according to claim 7, characterized in that, By setting up the vertical trusses or steel columns, the overall integrity of the bottom two-story structure is improved, making it easier to better utilize the self-weight of the two floors to balance the upward tension of the vertical cables.

9. The narrow frame structure of the ultra-high, large-span single-layer cable net curtain wall according to claim 8, characterized in that, Clamps for the glass curtain wall are installed at the intersection of the horizontal and vertical cables.

10. The narrow frame structure of the ultra-high, large-span single-layer cable net curtain wall according to claim 9, characterized in that, Both the horizontal and vertical cables are pre-tensioned to ensure that the cable units have the necessary initial geometric stiffness.

Images