چکیده
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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.
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