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本文以某特大斜拉桥为工程背景,基于有限元软件,结合桥梁原始设计资料,建立了桥梁动力计算模型,对斜拉桥拉索损伤进行模拟研究。通过拉索有效面积的变化对斜拉桥拉索损伤进行模拟,分析不同拉索损伤下斜拉桥自振频率的变化规律,得出斜拉桥拉索损伤对竖向弯曲振型影响较大,而对侧向弯曲和扭转振型的影响较小的结论。同时,也认识到长索区拉索损伤对斜拉桥低阶振型影响较大,相反,短索区则对斜拉桥高阶振型的影响较大。
In this paper, a large cable-stayed bridge is taken as the engineering background. Based on the finite element software and the original design data of the bridge, a bridge dynamic calculation model is established to simulate the cable damage of the cable-stayed bridge. The cable damage of the cable-stayed bridge was simulated by the change of the effective area of the cable. The variation regularity of the natural frequency of the cable-stayed bridge with different cable damages was analyzed. It was found that the cable damage of the cable-stayed bridge had a great influence on the vertical bending mode , While the impact on the lateral bending and torsional vibration modes is smaller. At the same time, it is also recognized that the cable damage in the long cable region has a great influence on the low-order vibration modes of the cable-stayed bridge. On the contrary, the short cable region has a great influence on the high-order vibration modes of the cable-stayed bridge.