Near-Fault Forward Directivity Effect on the Estimation of Ground Motion Amplification Factors
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 147, Issue 12
Abstract
Near-fault forward directivity (NFFD) ground motions cause significant potential damage to civil infrastructure. Buildings at soil sites at which NFFD motions are expected might need probabilistic seismic hazard analysis (PSHA) for soil sites considering the NFFD effect. In the analysis, ground motion amplification factors (GMAFs) considering the NFFD effect are required. Thus, investigating the characteristics of GMAFs due to the NFFD effect is important. To achieve this objective, this paper performs probabilistic ground response analyses for two typical soil sites subjected to three ground motion suites, that is, NFFD motions, far-fault motions, and near-fault motions without pulses. The results indicate that pulse periods of NFFD motions significantly affect the characteristics of GMAFs, rendering mean GMAFs remarkably lower or higher than those of ordinary ground motions. This study also reveals that standard deviations of GMAFs are insensitive to types of input motions. By further investigating the influences of soil deposit on pulse periods, this study observes that the pulse periods tend to approach 1.5 times the fundamental period of the soil deposit after pulselike ground motions propagate through the soil deposit. This observation provides a useful clue to pulselike ground motion selection for soil sites.
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Data Availability Statement
Data on the probabilistic ground response analysis and analysis results are available from the corresponding author on request.
Acknowledgments
The research for this study was supported by the National Key R&D Program of China (Grant No. 2018YFC0705604) and partially supported by Shenzhen University Stability Support Plan (GXWD20201230155427003-20200823204913001), and the Fundamental Research Funds for the Central Universities (Grant Nos. YJ201824 and 19XJ0077). We are also very thankful to Dr. Mladen Vucetic from the University of California, Los Angeles, for providing us with the results of soil parameter testing on the La Cienega site.
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 147 • Issue 12 • December 2021
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© 2021 American Society of Civil Engineers.
History
Received: May 16, 2020
Accepted: Aug 4, 2021
Published online: Sep 17, 2021
Published in print: Dec 1, 2021
Discussion open until: Feb 17, 2022
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