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Design method of initial prestress state of spoke type cable bearing grid steel structure

A technology of initial prestressing and design methods, applied in special structures, building components, etc., can solve problems such as asymmetry, tedious and time-consuming calculations, and achieve the effect of avoiding iterative calculations and saving tedious and time-consuming

Active Publication Date: 2020-06-30
CITIC GENERAL INST OF ARCHITECTURAL DESIGN & RES
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AI Technical Summary

Problems solved by technology

However, in actual engineering, the coordinates and loads of the spoke-type cable-supported grid steel structure may be asymmetrical and the situation is complicated. In many cases, it cannot be determined by analytical method.
Another nonlinear finite element test algorithm is the most commonly used method to determine the pretension of the cable for the spoke-type cable-supported grid steel structure, but it is very cumbersome and time-consuming due to the need for repeated adjustment and iterative calculations

Method used

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  • Design method of initial prestress state of spoke type cable bearing grid steel structure
  • Design method of initial prestress state of spoke type cable bearing grid steel structure
  • Design method of initial prestress state of spoke type cable bearing grid steel structure

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Embodiment approach 1

[0019] Taking the design of a spoke-type cable-supported grid steel structure as an example to illustrate the above design method:

[0020] (1) Determine the geometric shape of the spoke-type cable-supported grid steel structure according to the architectural modeling requirements, set the fixed hinge support at the lower end of the vertical strut 3 through the structural analysis software, and calculate the support reaction force and self-weight The 3-axis force value of the lower vertical strut is N3.

[0021] (2) Determine the angle α between each radial cable 2 and the horizontal line according to the shape of the building, use the axial force N3 of the vertical strut 3, and use the local force balance principle of the radial cable 2 and ring cable 1 nodes to preliminarily obtain the The estimated value of the initial pretension of the direction cable 2 N2=N3 / sinα; after obtaining the cable force N2 of each radial cable 2, the minimum radial cable force multiplied by 6.5 t...

Embodiment approach 2

[0028] In order to further illustrate the implementation of the method, a stadium spoke-type cable-supported grid steel structure is taken as an example to illustrate the determination process of its initial prestressed state (only a typical axis is used as an example for data description).

[0029] Step 1: According to the architectural requirements, establish the initial geometric model of the structure such as Figure 1~3 ; And calculate the axial force value N3 of the vertical strut under its own weight.

[0030] Step 2: Calculate the angle α between the radial cable and the horizontal line according to the shape of the building, and use the axial force N3 of the vertical strut to initially obtain the estimated value of the initial pretension of the radial cable N2=N3 / sinα; get 2 cables for each radial cable After force N2, the minimum radial cable force multiplied by 6.5 times is the hoop cable force N1 at the corresponding node, the maximum radial cable force multiplied ...

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Abstract

The invention relates to a design method of an initial prestress state of a spoke type cable bearing grid steel structure. The design method comprises the following steps of performing calculation according to the self-weight condition borne by the spoke type cable bearing grid steel structure to obtain the magnitude of load effect borne by nodes of radial cables and ring cables; obtaining the initial pretension estimated value of each radial cable under the self-weight and the cable force distribution condition of the radial cables and the ring cables; determining the diameters of the radialcables and the ring cables according to the pretension, inputting the initial pretension obtained by comparison into a finite element structure model, and checking and adjusting the structure shape until the requirement of the building appearance is met after geometric nonlinear static calculation; and determining the pretension of the radial cables and the ring cables, and obtaining the diametersof new radial cables and new ring cables at the same time, thereby determining the initial prestress state of the structure. The design method of the initial prestress state of the spoke type cable bearing grid steel structure of the invention is suitable for the design of the spoke type cable bearing grid steel structure.

Description

technical field [0001] The invention relates to the field of space structures, in particular to the architectural design and structural design of a spoke-type cable-supported grid steel structure. Background technique [0002] The spoke-type cable-supported grid steel structure is usually composed of a rigid grid, a flexible cable system, and a vertical brace. The flexible cable system provides vertical support for the upper rigid grid through the vertical brace; Due to the action of the pressure ring, the flexible cable system is stretched to make the whole structure a self-balancing system, wherein the flexible cable system includes radial cables and ring cables. [0003] In the design of spoke-type cable-supported grid steel structures, it is often difficult to determine the initial prestressed state. Generally, there are two methods for the design of the traditional initial prestressed state: one is the calculus analysis method; the other is the nonlinear finite element...

Claims

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Application Information

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IPC IPC(8): E04B1/34
CPCE04B1/34
Inventor 李治涂建
Owner CITIC GENERAL INST OF ARCHITECTURAL DESIGN & RES
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