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Computers and Concrete Volume 27, Number 5, May 2021 , pages 447-455 DOI: https://doi.org/10.12989/cac.2021.27.5.447 |
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A new index based on short time fourier transform for damage detection in bridge piers |
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Hamid Reza Ahmadi, Navideh Mahdavi and Mahmoud Bayat
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| 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. | ||
| Key Words | ||
| damage detection; bridge piers; short time fourier transform; new damage index | ||
| Address | ||
| Hamid Reza Ahmadi: Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Maragheh 55136-553, Iran Navideh Mahdavi: Department of Civil Engineering, Marand Branch, Islamic Azad University, Marand, Iran Mahmoud Bayat: Department of Civil and Environmental Engineering, University of South Carolina, Columbia, SC, USA | ||