## 2 Construction of a DTs Framework for Sensitivity Discrimination
### Capture of Twin Information  
The DTs replicate a real physical entity through visual virtual space modeling, and the virtual model simulates the dynamic behavior of that entity in a real environment [22; 23]. It is necessary to compare multidimensional structural data during assessment of the structural safety state [24]. Therefore, the first step in the twin modeling of cable tensioning is to identify the factors influencing the safety for analysis. The changes in the external effect and structural mechanical properties of the prestressed steel structure subjected to the tensioning process are the external and internal causes of the structural state change. The changes in the structure and mechanical performance of the structure can directly change the state of the structure. Likewise, the changes in the structural state of the prestressed steel structure in the tensioning process will also cause a change in the structural mechanical properties; thus, the changes in the structural state can be reflected in the degree of changesin the structural mechanical properties. The state of the structure directly responds to the safety performance of the structure. The intrinsic relationship between the basic factors influencing the safety performance of prestressed steel structures during tensioning is shown in Figure 1.  
From the intrinsic relationship of the factors influencing the structural safety performance, it can be concluded that the information to be captured for the tensioning process is mainly divided into the action to which the structure is subjected (S) and the mechanical properties of the structure (R). The twin model established in this study can accurately map the state of the structure. 1. The role of structure bearing  
There are multiple causes of structural damage or destruction during the tensioning process. By combining the effects of various external influences [25], this study focuses on capturing and sensing the member length errors (\(L_{e}\)), wind load effects (\(W_{l}\)), and temperature effects (\(T_{e}\)). The component length error is the most important factor causing the initial form and pretension deviation of the cable tension structure [26]. The effective control of the length error effect is key in the design of prestressed steel structures, especially in the design of construction tensioning. In an actual project, the geometric error of the cable tension structure mainly includes the error of the release length of the cable, error of the size of the anchorage or node, and deviation of the bearing position. Geometric errors can cause deviations in the initial form of the flexible pretensioned structure design, resulting in inconsistencies between construction and design and a consequent loss in prestress. The severity and sensitivity of the wind vibration effects of large-span space structures are no less than those of high-rise and towering structures. In most cases, wind loads tend to be controlling loads in the design of structures [27]. The cable is a flexible system, which very easily deforms under the wind load, thus affecting the safety performance of the entire structure. Therefore, the monitoring of wind pressure helps to scientifically predict the safety performance of cables. Because steel structures have temperature-sensitive properties, the analysis of temperature effects is very important in the design and construction of large-span steel structures [28]. Changes in temperature result in temperature stresses and temperature deformations in the structure. Prestressed cables are important elements of superstationary structures, and the effect of temperature inevitably causes changes in the internal forces of the cables, thus affecting the safety performance of the structure. 2. Mechanical properties of the structure  
It is more common to determine the safety performance of a structure according to the state of the prestressed steel structure during tensioning.