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Joint Time Frequency Analysis Based Synthesis of Acceleration-Time History and Response Spectra for Japanese Earthquakes

Ramkrishnan, R and Devaraj, D and Kolathayar, S and Sitharam, TG (2022) Joint Time Frequency Analysis Based Synthesis of Acceleration-Time History and Response Spectra for Japanese Earthquakes. In: 7th International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics, ICRAGEE 2021, 12 - 15 Jul 2021, Bangalore, pp. 21-31.

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Official URL: https://doi.org/10.1007/978-981-16-5673-6_2


Time�Frequency Analysis (TFA) techniques help to obtain the ideal time and frequency occurrence characteristics of earthquake motion confined in a seismic recorded signal. Time-histories from recording stations in Japan has been adopted in the present analysis, considering a large number of available data. The seismograms were transformed using Gabor transform, a Linear Joint TFA method, to assess their frequency content by generating their Gabor coefficients. Average Gabor coefficients were estimated for recorded seismograms within a magnitude range of 5.5�6.0 and hypocentral distances ranging from 0 to 50 km. The estimated average Gabor coefficients were used to synthesize a generalized acceleration-time history for the specific distance and magnitude ranges using Gabor Expansion, without compromising the frequency content of the waves. Additionally, it is demonstrated that the response spectra of the synthesized signal and the original signal match very well. These response spectra will be valuable for the nonlinear investigation of structures in this region. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

Item Type: Conference Paper
Publication: Lecture Notes in Civil Engineering
Publisher: Springer Science and Business Media Deutschland GmbH
Additional Information: The copyright for this article belongs to the Author.
Keywords: Mathematical transformations, Acceleration-time history; Frequency contents; Gabor coefficients; Gabor transform; Joint time-frequency analysis; Linear time frequency; Linear time�frequency analyse; Response spectra; Time-frequency Analysis; Time-history, Earthquakes
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 12 Jan 2022 05:45
Last Modified: 12 Jan 2022 05:45
URI: http://eprints.iisc.ac.in/id/eprint/70922

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