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论文类型：期刊论文

发表时间：2015-10-01

发表刊物：COMPUTER-AIDED CIVIL AND INFRASTRUCTURE ENGINEERING

收录刊物：SCIE、EI、Scopus

卷号：30

期号：10

页面范围：771-784

ISSN号：1093-9687

摘要：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.