<p>The mechanical behavior of the suspenders under the coupled effects of vehicular loads and environmental factors is exceptionally complex, and the failure paths of the high-strength steel wires within the suspenders remain unclear. Consequently, there is an urgent need to establish a reliability assessment method for the fatigue system of short suspenders in existing tied-arch bridges. Taking the Fu-rong Town Bridge in China as the engineering background, this study establishes a multi-scale finite element model of the bridge and performs a dynamic response analysis of the arch bridge's suspenders using transient analysis methods. The bending-tension effects at the anchorage section of the suspenders under vehicular loads are investigated based on elementary beam theory. The bending coefficient of the shortest hanger rod in an arch bridge is 13.6 times higher than that of the longest hanger rod. Furthermore, the fatigue failure paths of the parallel steel wires within the suspenders are explored. Based on these findings, a reliability function for the fatigue system of high-strength steel wires is established using linear elastic fracture mechanics theory. The results indicate that the high-strength steel wires on the tension side of the bent short suspenders experience the maximum stress during fatigue failure, and the fatigue fracture propagates from the tension side to the compression side among the parallel steel wires.</p>