A Test Method for Damage Diagnosis of Suspension Bridge Suspender Cables
A Test Method for Damage Diagnosis of Suspension Bridge Suspender Cables
复制标题
DOI：
10.1111/mice.12144
复制
发表时间：
2015-10
期刊：
影响因子：
--
通讯作者：
Yonghui An;B. Spencer;J. Ou
中科院分区：
文献类型：
--
作者：
Yonghui An;B. Spencer;J. Ou
悬索桥主缆是悬索桥最脆弱的构件之一，因此，发展有效的损伤检测方法势在必行。许多以前的损伤检测方法需要精确的有限元模型，这往往是很难获得的。本文提出了一种无模型试验方法，用于吊杆索的损伤诊断，以避免这个问题。该方法包括两个过程：平均归一化曲率差过程和曲率差概率过程。单损伤和多损伤的数值结果表明：（1）这两种方法都能有效地诊断悬索的损伤：（2）长悬索比短悬索更容易诊断出小损伤，如长悬索刚度降低5%时可以诊断出;（3）噪声通常不是问题，因为信噪比可以通过增加吊索的脉冲激励幅度来提高。拟议的测试方法并没有消除人工检查的必要性，而是将其从观察改为更量化的方法。所有这些点都增加了所提出的方法的实际应用的潜力。
Suspender cables are one of the most vulnerable components of a suspension bridge; therefore, development of effective methods for damage detection is imperative. Many previous damage detection methods require an accurate finite element model, which is often difficult to obtain. This article proposes a model‐free test method for damage diagnosis of suspender cables that avoids this problem. The method includes two procedures: the mean normalized curvature difference procedure and the curvature difference probability procedure. Numerical results for single and multiple damage cases indicate that: (1) both procedures can be effective for damage diagnosis of suspender cables; (2) small damage can be more easily diagnosed in long suspender cables than short ones, for example, 5% stiffness reduction in long suspender cables can be diagnosed; and (3) noise is generally not a problem, because the signal‐to‐noise ratio can be improved by increasing the pulse excitation magnitude for a suspender cable. The proposed test method does not eliminate the need for manual inspection, but changes it from observation to a more quantified method. All of these points increase the potential of the proposed method for practical applications.