Application of short-time Fourier transform to high-rise frame structural-health monitoring based on change of inherent frequency over time |
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| Authors: | GUO Shao-xia and PEI Qiang |
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| Institution: | The R&D Center of Civil Engineering Technology, Dalian University, Dalian 116622, P. R. China and The R&D Center of Civil Engineering Technology, Dalian University, Dalian 116622, P. R. China |
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| Abstract: | The high-rise frame structure has become more and more widespread, like its damage from the complication of the environment. The traditional method of damage detection, which is only suitable for the stationary signal, does not apply to a high-rise frame structure because its damage signal is non-stationary. Thus, this paper presents an application of the short-time Fourier transform (STFT) to damage detection of high-rise frame structures. Compared with the fast Fourier transform, STFT is found to be able to express the frequency spectrum property of the time interval using the signal within this interval. Application of STFT to analyzing a Matlab model and the shaking table test with a twelve-story frame-structure model reveals that there is a positive correlation between the slope of the frequency versus time and the damage level. If the slope is equal to or greater than zero, the structure is not damaged. If the slope is smaller than zero, the structure is damaged, and the less the slope is, the more serious the damage is. The damage results from calculation based on the Matlab model are consistent with those from the shaking table test, demonstrating that STFT can be a reliable tool for the damage detection of high-rise frame structures. |
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| Keywords: | short-time Fourier transform fast Fourier transform damage identification shaking table test time-frequency analysis |
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