引用本文:GUO Shao-xia,PEI Qiang.[en_title][J].Journal of Chongqing University (English Edition),2017,16(1):1~10
GUO Shao-xia,PEI Qiang.Application of short-time Fourier transform to high-rise frame structural-health monitoring based on change of inherent frequency over time[J].Journal of Chongqing University (English Edition),2017,16(1):1~10
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Application of short-time Fourier transform to high-rise frame structural-health monitoring based on change of inherent frequency over time
GUO Shao-xia, PEI Qiang
The R&D Center of Civil Engineering Technology, Dalian University, Dalian 116622, P. R. China
摘要:
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.
关键词:  short-time Fourier transform  fast Fourier transform  damage identification  shaking table test  time-frequency analysis
DOI:10.11835/j.issn.1671-8224.2017.01.001
分类号:
基金项目:
Application of short-time Fourier transform to high-rise frame structural-health monitoring based on change of inherent frequency over time
GUO Shao-xia, PEI Qiang
The R&D Center of Civil Engineering Technology, Dalian University, Dalian 116622, P. R. China
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.
Key words:  short-time Fourier transform  fast Fourier transform  damage identification  shaking table test  time-frequency analysis
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