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A classification method for pulse-like ground motions based on S-transform
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DOI：10.1007/s11069-016-2421-y.png)
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Abstract
En 中文
This article presents a new identification procedure to detect pulse-like ground motion based on the S-transform. The S-transform is utilized as an effective tool for time-frequency representation of ground motions. It is shown that plots of the S-transform in the time-frequency domain named as the S-feature provide useful information for initial detection of pulses in the velocity time history of the ground motions. To perfect identification of pulse-like motions, a method is presented for extraction of pulses from original ground motions based on the convolution theorem. The proposed procedure is applied for classification of pulse-like near-fault ground motions owing to directivity effects in a data set of selective earthquakes. The period of velocity pulses, as an important parameter in structural engineering, is also determined from extracted pulses. The results of this study provide a suitable platform for selecting pulse-like records, when seismic analyses of structures in near-fault areas are of primary interest.
Keywords:
Pulse-like ground motion
Near fault
S-transform
S-feature
Filtering
Extraction
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