应变模态在斜拉索损伤诊断中的应用

Identifying the damage of stayed-cables based on the method of strain mode

应用应变模态方法对斜拉索的损伤识别进行了研究。通过对斜拉索在不同损伤工况下的数值仿真计算,探讨了应变模态方法用于斜拉索损伤识别的能力。结果表明:利用应变模态差曲线能准确识别斜拉索的损伤位置。并且,应变模态差曲线在斜拉索损伤单元处的跳跃幅值随单元损伤程度的增加而增大。所以,应变模态是对结构进行损伤诊断的较理想的损伤识别指标。

Based on the method of strain mode, the damage identification of a stayed-cable is studied. In the paper, the capability to identify the damage of the stayed-cable by the numerical simulatlon of difference damage cases of the stayed-cable. The results show that the damage of the stayed-cable can be accurately identified by the curve difference of strain mode ,and the peak values of strain mode increase with the element damage of the stayed-cable. Strain mode is an ideal damage identification signature to diagnose damage.