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http://dx.doi.org/10.12989/cac.2021.27.5.447

A new index based on short time fourier transform for damage detection in bridge piers  

Ahmadi, Hamid Reza (Department of Civil Engineering, Faculty of Engineering, University of Maragheh)
Mahdavi, Navideh (Department of Civil Engineering, Marand Branch, Islamic Azad University)
Bayat, Mahmoud (Department of Civil and Environmental Engineering, University of South Carolina)
Publication Information
Computers and Concrete / v.27, no.5, 2021 , pp. 447-455 More about this Journal
Abstract
Research on damage detection methods in structures began a few decades ago with the introduction of methods based on structural vibration frequencies, which, of course, continues to this day. The value of important structures, on the one hand, and the countless maintenance costs on the other hand, have led researchers to always try to identify more accurate methods to diagnose damage to structures in the early stages. Among these, one of the most important and widely used methods in damage detection is the use of time-frequency representations. By using time-frequency representations, it is possible to process signals simultaneously in the time and frequency domains. In this research, the Short-Time Fourier transform, a known time-frequency function, has been used to process signals and identify the system. Besides, a new damage index has been introduced to identify damages in concrete piers of bridges. The proposed method has relatively simple calculations. To evaluate the method, the finite element model of an existing concrete bridge was created using as-built details. Based on the results, the method identifies the damages with high accuracy.
Keywords
damage detection; bridge piers; short time fourier transform; new damage index;
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