An energy-frequency parameter for earthquake ground motion intensity measure

authored by: Guan Chen, Jiashu Yang, Yong Liu, Takeshi Kitahara, Michael Beer
Abstract: A novel scalar ground motion intensity measure (IM), termed the energy-frequency parameter, is proposed based on the Hilbert-Huang transform. To validate the effectiveness of the proposed IM, the correlation analysis between the engineering demand parameter (EDP) and energy-frequency parameter is performed using 1992 recorded ground motions, in which EDP is the maximum inter-storey drift of structures obtained by nonlinear time-history analysis. Results show that the energy-frequency parameter has a strong linear correlation with EDP at natural logarithm, and this correlation is applicable for various structural fundamental periods. We also verified that the lognormal cumulative distribution function can characterize the energy-frequency parameter-based fragility function, which can further facilitate the application of the parameter in seismic risk analysis. Besides, the strong correlation between the energy-frequency parameter and other IMs (such as PGA, PGV, PGD, CAV, (Formula presented.), (Formula presented.), and SI) potentially makes the proposed IM widely applicable in seismic risk analysis. Moreover, since the energy-frequency parameter depends only on the frequency-domain characteristics of the ground-motion signal, it may closely link to seismological theory and provide new insights into seismology engineering.
Organisation(s): Institute for Risk and Reliability
External Organisation(s): Wuhan University
Kanto Gakuin University
University of Liverpool
Tongji University
Type: Article
Journal: Earthquake Engineering and Structural Dynamics
Volume: 52
Pages: 271-284
No. of pages: 14
ISSN: 0098-8847
Publication date: 10.01.2023
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Civil and Structural Engineering, Geotechnical Engineering and Engineering Geology, Earth and Planetary Sciences (miscellaneous)
Electronic version(s): https://doi.org/10.1002/eqe.3752 (Access: Open)