Abstract
The chapter discusses the safety assessment of existing riveted railway bridges. A fracture mechanics (FM) model and a probabilistic fracture mechanics (PFM) model are developed to determine the fatigue safety of existing riveted railway bridges. Firstly, the fracture mechanics model is applied. The initial crack size is assumed through the ultrasonic detection method. With two simplified fracture mechanics models—CCT and DECT—the critical crack size and the failure mode are analyzed in the chapter. The remaining fatigue life is calculated through the simulation of crack growth. Secondly, the probabilistic fracture mechanics model, double-angle probabilistic fracture failure model (DAPFFM), is presented in the chapter. A reliability analysis program, based on the Monte-Carlo method, is developed to compute the fatigue failure probability of DAPFFM. Finally, the deterministic FM model and the PFM model are applied to the fatigue safety assessment of Ganjiang Railway Bridge, and the inspection intervals are determined.
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