Research on construction slip monitoring method of spatial steel structure with triangular cone shape spanning 120 meters

The sliding of long-span steel structure is a dynamic process, and factors such as sliding thrust, environmental load, track bearing capacity, and track smoothness all affect the accurate positioning of the structure. Therefore, a method that can monitor the structural safety, stability, and synchronization of the sliding construction process was proposed. This method can accurately predict the location and degree of structural damage during sliding and take measures in advance by simulating and analyzing the construction sliding process. To avoid stress concentration, excessive local deformation, derailment, instability, and overturning, the changes of parameters in the construction process of structural sliding were monitored in real-time. Taking the steel structure roof of Datong Art Museum as an example, before the slip, the sliding construction process was analyzed and a monitoring system was installed. The system was used for real-time monitoring, analysis, and feedback on the strain, displacement, and deformation of the key components of the structure as well as ambient temperature during the sliding process. The results show that the sliding of long-span steel structure is affected by temperature, track smoothness, structural deformation value at the track and jacking equipment error. The monitoring methods that combine finite element simulation, on-site monitoring, real-time analysis and feedback, can effectively control the internal forces, deformation, synchronization of the sliding of each rail and the overall stability of the structure during the slip process. © 2022 Science Press. All rights reserved.