中文摘要：

以某下承式钢管混凝土系杆拱桥为背景，建立该桥的三维有限元模型，采用有效横截面积减小率模拟吊索损伤，通过仿真计算分析单根吊索和多根吊索发生不同程度损伤时，吊索系统静拉力重分布规律。结果表明，损伤吊索系统的静拉力重分布只在损伤吊索与其两侧相邻吊索间进行，多根吊索损伤引起吊索系统静拉力重分布近似等效于各单根损伤吊索引起静拉力重分布的线性叠加。该结论对于系杆拱桥吊索系统力学分析与评估具有较大的工程实用价值。

英文摘要：

Against the background of a concrete-filled steel tube through tied arch bridge, the three-dimensional finite element model for the type of the bridge is established and the damages to the hangers of the bridge are simulated by means of the reduction ratio of effective cross section area. Through the simulation and calculation, the law of the static tensile force redistribution of the hanger system at the time the damages of different degrees occur in a single hanger and multiple hangers is analyzed. The results of the analysis show that the tensile force redistribution of the damaged hanger system only takes place in the damaged hanger and the adjacent hangers at both sides. The tensile force redistribution due to damages to the multiple hangers is approxi- mately equivalent to the linear superimposition of the tensile force redistribution caused by the damage to each single hanger. The conclusions generalized herewith are of important engineering application value to the mechanical analysis and assessment of the hanger systems of other tied arch bridges.