Mechanical Performance and Safety Evaluation of Connection Nodes in Prefabricated Assembled Structures

The long-term reliability of communication infrastructures, antenna supporting systems, and integrated engineering platforms in Electromagnetic Waves, Antennas and Propagation increasingly depends on the mechanical stability and safety of their structural connection components. To address the difficulty of quantitatively evaluating the stress behavior and safety performance of prefabricated assembled joints, this study proposes a comprehensive framework integrating structural parameter modeling, finite element analysis (FEA), mechanical performance extraction, and multi-index safety assessment. A three-dimensional numerical model is established to characterize stress distribution, deformation evolution, stiffness degradation, and failure mechanisms under combined loading conditions. Based on the simulated mechanical responses, ultimate bearing capacity, equivalent stiffness retention coefficient, and ductility coefficient are extracted and incorporated into a normalized weighted evaluation model to construct a comprehensive safety index for quantitative reliability assessment. Experimental results show that under C50 concrete, HRB500 reinforcement, and a sleeve length of 180 mm, the connection node achieves an ultimate bearing capacity of 356 kN, an equivalent stiffness retention coefficient of 0.82, a ductility coefficient of 3.59, and an overall safety index exceeding 0.90, demonstrating excellent structural performance. The proposed framework provides a robust methodology for structural reliability evaluation and engineering optimization of complex load-bearing systems, with potential applications in antenna supporting structures, communication infrastructure design, and mechanically integrated platforms associated with Electromagnetic Waves, Antennas and Propagation.