## 4 Calculation Example
### Analysis Results of the Construction Technology Application  
#### 4.2.1 Analysis of Cable Net Traction Lifting  
The traction lifting of the cable net is a process of transformation from a stress-free or low-stress state to a high-stress state. In this process, the pre-load established by the cable should be completely taken up by the CR. Due to the combined effect of the large length difference of the initial traction cable and the irregular elliptical CR, the cable forces are uneven and will ultimately cause uneven stress in the CR and excessive deformation. Meanwhile, the distribution of cable forces is also greatly influenced by the traction lifting sequence. Therefore, choosing a reasonable traction lifting sequence seems to be important. This section first adopts a synchronous and equally proportioned integral traction lifting sequence and analyzes the variation in CR deformation, the traction cable forces, and the internal forces of the CR brackets during the traction process to determine the key factors that affect them. Then the cable net traction lifting sequence is improved through the results of synchronous and equally proportioned integral sequence, and the final traction process of the cable net is analyzed according to the adjusted one. Through NDFEM, the cable net traction lifting analysis model is built, which is shown in Figure 15. This model displays the initial state of the construction, which is the state where all cables are laid on the stand. The FEA model includes structural columns, CR, cable net, and CR brackets. The load conditions include the weight of the structure, radial cable heads, tension ring heads, and cable clamps, and the material characteristics and boundary conditions can be found in Section 4.1. Results of Synchronous Equal Proportion Integral Lifting  
Synchronous and equal proportion integral lifting means that all traction cables are pulled at the same time according to the same proportion. Specifically, each traction cable will be shortened by 10% of its initial length during each traction step. All corresponding  
Figure 14: Comparison curves of tension ring cable forces (kN). 1. Typical configuration in the process of cable net traction lifting is shown in Figure 16, and the maximum and minimum vertical deformation of the structure (relative to the design configuration) under each calculation condition are listed in Table 8, reflecting the continuous variation in cable net system elevation in the whole process of traction lifting. (2). In order to intuitively express the radial deformation of the CR, radial deformations of 56 typical CR nodes through local cylindrical coordinates are extracted to be drawn as a deformation curve, which is shown in Figure 17. (Local cylindrical coordinate system: Taking the arc center of the node itself as the origin, the direction from the origin to the node is the X-axis, the tangential direction is the Y-axis, and the vertical direction is the Z-axis.) Figure 18 shows the maximum equivalent stress variation in CR under various traction steps. From Figures 17 and 18, it is evident that the radial deformation Ux and the maximum equivalent stress of the CR vary greatly from C1 to C2. At C2, the maximum outward expansion deformation reaches 150 mm, which appears at 45\({}^{\circ}\) of the CR, and the maximum inward contraction deformation is 161 mm, which appears at the minor axis. From C2 to C11, the 45\({}^{\circ}\) CR outward expansion, short axis CR inward contraction deformation, and maximum equivalent stress decrease continuously with continuous traction. (The long axis refers to axis