Transition type interlayer web member belt structure

Abstract

According to the transition type interlayer web member belt structure, an outer frame comprises upper chords and lower chords, a rectangular frame defined by each upper chord or each lower chord serves as a basic unit, the four corners of the upper frame are connected through vertical rods, and the middles of the vertical rods on the left side and the right side are connected through middle-layer rods of outer interlayer web members; an inner interlayer web member middle-layer rod is arranged between the two outer interlayer web member middle-layer rods in parallel; the internal frame comprises an upper interlayer and a lower interlayer, four corners of a basic unit of the upper chord member are respectively connected with an upper interlayer upper web member, and the lower end of the upper interlayer upper web member of the basic unit is connected with one end of an upper interlayer proud rod arranged in the front-back direction; the lower end of the upper-layer interlayer upper web member adjacent to the rear part of the basic unit is connected with the other end of the upper-layer interlayer superfluous rod; the four upper-layer interlayer lower web members are connected with one ends of the upper-layer interlayer superfluous rods, the bottom ends of the upper-layer interlayer lower web members are connected to connecting joints of middle-layer rods and vertical rods of the interlayer web members, and the lower-layer interlayer and the upper-layer interlayer are the same in structure and are symmetrically arranged.

Description

Technical Field

[0001] The utility model relates to the technical field of steel structure grids, lattice shells and complex truss structures, in particular to a transitional sandwich web bar belt structure. Background Art

[0002] According to the current design of large-span elliptical and circular lattice shell structures, most of them adopt conventional double-layer and multi-layer lattice shell structures. The grid division in lattice shell design is the key and difficult point of design, which is affected by the structural force system and the architectural appearance. At present, the grid division methods derived from the basic principles of finite element grid division include mapping method, grid method, node connection method, topological decomposition method (also known as triangulation algorithm), geometric decomposition method, etc. The division results can be roughly divided into orthogonal type, uniformly distributed polygon type, and radial type along the center. Among them, the radial grid radiates radially from the center to the surrounding area, and is coordinated and unified with the circumferential grid. It has its own rules. When placed in a nearly circular plane, it has a strong visual impact and sense of rhythm, which can fully express the geometric aesthetics of the structure and is very popular among designers.

[0003] Due to the inherent geometric characteristics of the radial grid, internal forces are unevenly distributed, resulting in differential internal forces between adjacent members and differential support reactions between adjacent supports. This is characterized by high internal forces near the middle and short-span supports, forming a large stress zone along the middle of the short diameter. This requires increasing the center thickness of the lattice shell to control the maximum member cross-sectional specifications. At the same time, a transition zone needs to be set at an appropriate location in the middle to avoid overcrowding of members in the center. When designing the lattice shell based on the above, we found that a large number of adjacent members in the transition zone of the lattice shell grid did not meet the structural requirements due to too small an angle. At the same time, the amount of steel used in the node ball increased significantly due to factors such as the member angle and support reaction, making it extremely uneconomical. More importantly, the shortcomings of the node design seriously affected the aesthetic appearance of the structure.

[0004] Due to the above problems, most designers have to abandon this radial grid.

[0005] The above problems need to be solved in order to make the radial grid division of the near-circular grid shell more flexible, the grid division based on the overall internal force distribution more reasonable, the angle between adjacent components unrestricted, and the design no longer need to repeatedly adjust the grid modeling and calculation, thereby greatly reducing the design difficulty and workload. At the same time, it can also make the node design more reasonable. More importantly, while solving the structural problem, the structural geometric beauty of the near-circular grid of the radial grid of the grid shell can be maintained. This brings difficulties to the design based on the radial grid of the large-span grid shell. Utility Model Content

[0006] In order to solve the above existing problems, the present invention provides a transitional sandwich web bar belt structure. The present invention is implemented through the following technical solutions.

[0007] A transitional sandwich web bar belt structure comprises an external frame and an internal frame, wherein the external frame comprises an upper frame formed by upper chords connected in a crisscross manner and a lower frame formed by lower chords connected in a crisscross manner, and each rectangular frame surrounded by an upper chord or a lower chord is a basic unit, and the four corners of the left and right ends of the upper frame are connected to the four corners of the left and right ends of the lower frame by vertical bars, and the middle parts of the vertical bars on the left and right sides are connected by an external sandwich web bar middle bar, the vertical bar above the external sandwich web bar middle bar is the upper vertical bar, and the vertical bar below the external sandwich web bar middle bar is the lower vertical bar, and the internal sandwich web bar middle bar is arranged in parallel between the two external sandwich web bar middle bars; the internal frame comprises an upper sandwich and a lower sandwich, and the upper sandwich comprises an upper sandwich, an upper sandwich, and a lower sandwich. Rod, upper interlayer supernumerary rod, lower interlayer lower abdominal rod; the four corners of the upper chord rod-basic unit are respectively connected with an upper interlayer upper abdominal rod, the lower end of the upper interlayer upper abdominal rod of the basic unit is connected to one end of the upper interlayer supernumerary rod arranged in the front and rear directions, and the lower end of the upper interlayer upper abdominal rod adjacent to the rear of the basic unit is connected to the other end of the upper interlayer supernumerary rod; the four upper interlayer lower abdominal rods are connected to one end of the upper interlayer supernumerary rod, and the bottom end of the upper interlayer lower abdominal rod is connected to the connection node of the interlayer abdominal rod middle rod and the vertical rod, or the bottom end of the upper interlayer lower abdominal rod is connected to one end of the inner interlayer abdominal rod middle rod; the lower layer interlayer includes the lower interlayer upper abdominal rod, the lower interlayer supernumerary rod, and the lower interlayer lower abdominal rod; the lower layer interlayer has the same structure as the upper interlayer and is symmetrically arranged.

[0008] Furthermore, the angles between the upper interlayer upper web bar and the upper interlayer lower web bar connected thereto, the angles between the upper interlayer lower web bar and the lower interlayer upper web bar connected thereto, and the angles between the lower interlayer upper web bar and the lower interlayer lower web bar connected thereto are greater than 30°.

[0009] Furthermore, the angles between the upper interlayer upper abdominal rod and the upper interlayer supernumerary rod connected thereto, the upper interlayer lower abdominal rod and the external interlayer abdominal rod middle rod connected thereto, the upper interlayer lower abdominal rod and the internal interlayer abdominal rod middle rod connected thereto, the lower interlayer lower abdominal rod and the lower interlayer supernumerary rod connected thereto, the lower interlayer upper abdominal rod and the external interlayer abdominal rod middle rod connected thereto, and the lower interlayer upper abdominal rod and the internal interlayer trunk middle rod connected thereto are greater than 30°.

[0010] Furthermore, the angles between the upper interlayer upper web member and the upper chord member connected thereto, and between the lower interlayer lower web member and the lower chord member connected thereto are greater than 30°.

[0011] Furthermore, when a plurality of basic units are combined, the upper web members of the upper interlayer and the outer four corners of the upper chord members are connected via ball joints.

[0012] Beneficial effects of the utility model:

[0013] 1. The utility model adopts a local sandwich web arrangement, making the traditional grid shell design more flexible;

[0014] 2. The utility model makes the elliptical lattice shell radially divided, and when the lattice shell thickness is limited by the angle of the rods, it can improve the angle of the rods, greatly reducing the length of the rods and increasing the stability of the rods. At the same time, it can avoid the collision of the rods between the nodes and make the force on the nodes more reasonable;

[0015] 3. The utility model eliminates the need to repeatedly adjust the model grid when designing complex lattice shells, thereby greatly reducing the design workload and design difficulty;

[0016] 4. The utility model avoids the over-selection of key components and important components in the design of the lattice shell, which makes the construction difficult, difficult to process and install, and makes the construction quality easier to ensure;

[0017] 5. Due to the addition of structural superfluous rods, the internal forces are distributed to the superfluous rods under the consideration of the p-Δ effect, so that the structural stiffness does not show obvious sudden changes, which is very beneficial for the structural geometric nonlinear analysis;

[0018] 6. The utility model greatly saves the steel consumption of the node ball and effectively saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the layout of the utility model.

[0021] In the figure: 1. Upper chord; 2. Lower chord; 3. Upper mezzanine upper abdominal rod; 4. Upper mezzanine lower abdominal rod; 5. Upper mezzanine extra rod; 6. Upper vertical rod; 7. Lower vertical rod; 8. External mezzanine abdominal rod middle rod; 9. Internal mezzanine abdominal rod middle rod; 10. Lower mezzanine lower abdominal rod; 11. Lower mezzanine upper abdominal rod; 12. Lower mezzanine extra rod. DETAILED DESCRIPTION

[0022] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0023] In the description of the embodiments of the present invention, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the product of the utility model is usually placed when in use. It is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0024] Furthermore, the use of terms such as "horizontal," "vertical," and "overhanging" does not necessarily imply that the component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0025] In the description of the embodiments of the present invention, “a plurality of” means at least 2.

[0026] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0027] Example:

[0028] A transitional sandwich web belt structure includes an external frame and an internal frame, wherein the external frame includes an upper frame formed by connecting upper chords 1 in a crisscross pattern and a lower frame formed by connecting lower chords 2 in a crisscross pattern. The rectangular frame surrounded by each upper chord 1 or lower chord 2 is a basic unit. The four corners of the upper frame and the four corners of the lower frame are connected by vertical rods. The middle parts of the vertical rods on the left and right sides are connected by an external sandwich web middle rod 8. The vertical rod above the external sandwich web middle rod 8 is an upper vertical rod 6. The external sandwich web middle rod is connected to the upper vertical rod 6. The vertical rod below the rod 8 is the lower vertical rod 7, and the internal interlayer web middle rod 9 is arranged in parallel between the two external interlayer web middle rods 8; the internal frame includes an upper interlayer and a lower interlayer, and the upper interlayer includes an upper interlayer upper web rod 3, an upper interlayer supernumerary rod 5, and a lower interlayer lower web rod 4; the four corners of the upper chord rod 1-basic unit are respectively connected with an upper interlayer upper web rod 3, and the lower end of the upper interlayer upper web rod 3 of the basic unit is connected to one end of the upper interlayer supernumerary rod 5 arranged in the front and rear directions, and the upper interlayer upper web rod adjacent to the rear of the basic unit is connected to the upper interlayer The lower end of the rod 3 is connected to the other end of the upper interlayer supernumerary rod 5; the four upper interlayer lower abdominal rods 4 are connected to one end of the upper interlayer supernumerary rod 5, and the bottom end of the upper interlayer lower abdominal rod 4 is connected to the connection node of the external interlayer abdominal rod middle rod 8 and the vertical rod, or the bottom end of the upper interlayer lower abdominal rod 4 is connected to one end of the internal interlayer abdominal rod middle rod 9; the lower interlayer includes a lower interlayer upper abdominal rod 11, a lower interlayer supernumerary rod 12, and a lower interlayer lower abdominal rod 10; the lower interlayer has the same structure as the upper interlayer and is symmetrically arranged, and the four corners of the lower chord rod 2-basic unit are respectively connected There is a lower interlayer lower abdominal rod 10, the upper end of the lower interlayer lower abdominal rod 10 of the basic unit is connected to one end of the lower interlayer supernumerary rod 12 set in the front and rear directions, and the upper end of the lower interlayer lower abdominal rod 10 adjacent to the rear of the basic unit is connected to the other end of the lower interlayer supernumerary rod 12; the four lower interlayer upper abdominal rods 11 are connected to one end of the lower interlayer supernumerary rod 12, and the bottom end of the lower interlayer upper abdominal rod 11 is connected to the connection node between the external interlayer abdominal rod middle rod 8 and the vertical rod, or the top end of the lower interlayer upper abdominal rod 11 is connected to one end of the internal interlayer abdominal rod middle rod 9.

[0029] The angles between the upper interlayer web member 3 and the upper interlayer lower web member 4 connected thereto, the upper interlayer lower web member 4 and the lower interlayer upper web member 11 connected thereto, and the lower interlayer upper web member 11 and the lower interlayer lower web member 10 connected thereto are greater than 30°.

[0030] The angles between the upper interlayer upper abdominal rod 3 and the upper interlayer supernumerary rod 5 connected thereto, the upper interlayer lower abdominal rod 4 and the external interlayer abdominal rod middle rod 8 connected thereto, the upper interlayer lower abdominal rod 4 and the internal interlayer abdominal rod middle rod 9 connected thereto, the lower interlayer lower abdominal rod 10 and the lower interlayer supernumerary rod 12 connected thereto, the lower interlayer upper abdominal rod 11 and the external interlayer abdominal rod middle rod 8 connected thereto, and the lower interlayer upper abdominal rod 11 and the internal interlayer middle rod 9 connected thereto are greater than 30°.

[0031] The angles between the upper interlayer upper web member 3 and the upper chord member 1 connected thereto, and between the lower interlayer lower web member 10 and the lower chord member 2 connected thereto are greater than 30°.

[0032] When multiple basic units are combined, the upper sandwich upper web member 3 is connected to the outer four corners of the upper chord member 1 through ball nodes.

[0033] The utility model adopts a local sandwich web arrangement to make the traditional grid design more flexible; the utility model can improve the angle of the rods when the thickness of the elliptical grid is limited by the angle of the rods, and can avoid the collision of the rods between the nodes and make the node force more reasonable while greatly reducing the length of the rods and increasing the stability of the rods.

[0034] The utility model eliminates the need for repeated adjustment of model grids in the design of complex lattice shells, thereby greatly reducing the design workload and difficulty. The utility model avoids the over-selection of key components and important components in the lattice shell design, which leads to high construction difficulty, difficulty in processing and installation, and makes it easier to ensure the construction quality. Due to the addition of structural redundant rods, the internal force is distributed to the redundant rods under the consideration of the p-Δ effect, so that the structural stiffness does not show obvious mutations, which is very beneficial to the structural geometric nonlinear analysis. The utility model greatly saves the amount of steel used in the node ball, effectively saving costs.

[0035] The above description of the present invention and its embodiments is non-limiting. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, without inventive design, a structure and embodiment similar to the technical solution should fall within the scope of protection of the present invention.

Claims

1. A transitional sandwich web belt structure, characterized by: The frame comprises an external frame and an internal frame, wherein the external frame comprises an upper frame formed by upper chords connected in a crisscross manner and a lower frame formed by lower chords connected in a crisscross manner, and each upper chord or lower chord formed by a rectangular frame is a basic unit, and the four corners of the left and right ends of the upper frame are connected to the four corners of the left and right ends of the lower frame by vertical rods, and the middle parts of the vertical rods on the left and right sides are connected by external sandwich web middle rods, the vertical rod above the external sandwich web middle rod is the upper vertical rod, and the vertical rod below the external sandwich web middle rod is the lower vertical rod, and the internal sandwich web middle rod is arranged in parallel between the two external sandwich web middle rods; the internal frame comprises an upper sandwich and a lower sandwich, and the upper sandwich comprises an upper sandwich upper web, an upper sandwich The four corners of the upper chord rod and the basic unit are respectively connected with an upper interlayer upper abdominal rod, and the lower end of the upper interlayer upper abdominal rod of the basic unit is connected to one end of the upper interlayer superfluous rod arranged in the front and rear directions, and the lower end of the upper interlayer upper abdominal rod adjacent to the rear of the basic unit is connected to the other end of the upper interlayer superfluous rod; the four upper interlayer lower abdominal rods are connected to one end of the upper interlayer superfluous rod, and the bottom end of the upper interlayer lower abdominal rod is connected to the connection node of the interlayer abdominal rod middle rod and the vertical rod, or the bottom end of the upper interlayer lower abdominal rod is connected to one end of the inner interlayer abdominal rod middle rod; the lower interlayer includes the lower interlayer upper abdominal rod, the lower interlayer superfluous rod, and the lower interlayer lower abdominal rod; the lower interlayer has the same structure as the upper interlayer and is symmetrically arranged.

2. The transitional sandwich web belt structure according to claim 1, characterized in that: The angles between the upper interlayer upper web bar and the upper interlayer lower web bar connected thereto, the angles between the upper interlayer lower web bar and the lower interlayer upper web bar connected thereto, and the angles between the lower interlayer upper web bar and the lower interlayer lower web bar connected thereto are greater than 30°.

3. The transitional sandwich web belt structure according to claim 1, characterized in that: The angles between the upper interlayer upper abdominal rod and the upper interlayer supernumerary rod connected to it, the upper interlayer lower abdominal rod and the external interlayer abdominal rod middle rod connected to it, the upper interlayer lower abdominal rod and the internal interlayer abdominal rod middle rod connected to it, the lower interlayer lower abdominal rod and the lower interlayer supernumerary rod connected to it, the lower interlayer upper abdominal rod and the external interlayer abdominal rod middle rod connected to it, and the lower interlayer upper abdominal rod and the internal interlayer trunk middle rod connected to it are greater than 30°.

4. The transitional sandwich web belt structure according to claim 1, characterized in that: The angles between the upper interlayer upper web member and the upper chord member connected thereto, and between the lower interlayer lower web member and the lower chord member connected thereto are greater than 30°.

5. The transitional sandwich web belt structure according to claim 1, characterized in that: When multiple basic units are combined, the upper web members of the upper mezzanine and the outer four corners of the upper chord are connected through ball nodes.

Images