In some sections of simple-support bridges, fatigue failures of wire in overhead contact line systems are caused by large bridge oscillations generated by passing trains. Our study reveals the condition under which the amplitude of overhead contact line system oscillations becomes large, by analyzing coupled oscillations of bridges and catenary poles generated by passing trains. To prevent the fatigue failures of wire in overhead contact line systems caused by large bridge oscillations generated by passing trains, a pole vibration suppression band and a new metal fitting are developed. Moreover, a decision-making flowchart is developed to determine the necessity of measures.
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