Analysis of bearing capacity of tire frame in large-span steel truss corridor and floor support reinforcement study

Large-span corridors are characterized by their significant span, heavy load, and high elevation, making them prone to various uncertainties during the lifting process, which could pose potential safety risks during construction. This study focuses on the steel corridor tire frame of the C District at China Communications Construction Group’s Southern Headquarters base, analyzing the load-bearing capacity and safety during the installation of the lower corridor tire frame. Finite element simulation technology is employed to model the stress ratio and deflection of the tire frame in the lifting process. Since the tire frame directly affects the basement floor, the safety of the floor during construction must be considered. Prior to assembling the lower corridor, circular steel pipes are placed beneath the tire frame on the basement floor for a back-propping design, and a temporary tire frame structure for the lower corridor is checked for back-propping stability. Through theoretical calculations and finite element simulation analysis, it is determined that the strength and deflection of the lower corridor supporting tire frame in the proposed construction plan meet the criteria and standards requirements, and the back-propping steel pipes meet the strength and compressive stability requirements as specified in the standards.