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悬索桥的吊索在运营期间的安全是桥梁结构安全的最重要条件之一。为了深入的对悬索桥吊索损伤识别与定位进行研究,应用有限元软件Midas建立了某悬索桥的的整桥有限元模型。探讨了单根吊索不同损伤的情况下结构多阶模态的变化情况,同时也对多根吊索损伤时结构多阶模态的变化情况进行了研究。研究结果表明吊索的损伤导致结构模态的变化,通过基于运算数据建立了模态振型变化率指标曲线可以看出曲线的突变值大小与吊索的损伤程度有关,随着吊索损伤程度的加深,敏感性指标增大。通过敏感性指标值的大小,结合有限元分析,可以实现对吊索损伤程度的识别。采用这种方法能准确、可靠、有效地对吊索进行损伤识别与定位。
Suspension sling safety during operation is one of the most important conditions for the structural safety of bridges. In order to deeply study the sling damage identification and positioning of the suspension bridge, a finite element model of the whole bridge of a suspension bridge is established by using the finite element software Midas. The change of multi-mode structure under different damage of single sling is discussed, and the change of multi-mode structure of multi-sling is also studied. The results show that the damage of the sling leads to the change of the structural modal. Based on the operation data, the modal change rate of the modal shape is established. It can be seen that the magnitude of the abrupt change of the curve is related to the damage degree of the sling. Deepened, the sensitivity index increased. Sensitivity index value by the size, combined with the finite element analysis, can be achieved sling damage identification. Using this method can accurately, reliably and effectively damage the sling identification and positioning.