Procedure for Estimating Shear-Induced Seismic Slope Displacement for Shallow Crustal Earthquakes
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VIEW THE REPLYPublication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 145, Issue 12
Abstract
Shear-induced seismic slope displacement is estimated for earth structures or natural slopes due to shallow crustal earthquakes along active plate margins. The proposed procedure utilizes 6,711 two-component horizontal ground motion recordings from the updated NGA-West2 database to better capture this key source of uncertainty in assessing seismic performance. The fully coupled, nonlinear seismic slope displacement model captures the important influence of the system’s yield coefficient , its initial fundamental period , the ground motion’s spectral acceleration at a degraded period of the slope taken as , earthquake magnitude as a proxy for duration, and peak ground velocity and fault-normal effects for near-fault pulse motions. The procedure provides seismic slope displacement estimates consistent with observations from field case histories. A procedure for selecting the seismic coefficient used in pseudostatic slope stability analyses that is consistent with an allowable seismic displacement threshold is also presented. These procedures can be implemented rigorously within a probabilistic framework or used deterministically to evaluate the shear-induced component of seismic slope displacement.
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Acknowledgments
The Faculty Chair in Earthquake Engineering Excellence at UC Berkeley provided partial financial support to perform this research, which was supplemented by Georgia Tech. Dr. Youssef Bozorgnia and Dr. Silvia Mazzoni of the Pacific Earthquake Engineering Research (PEER) Center provided access to the NGA-West2 ground motion recordings used in this study and performed the sliding block analyses using scripts provided by the authors.
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 145 • Issue 12 • December 2019
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©2019 American Society of Civil Engineers.
History
Received: Jul 2, 2018
Accepted: May 16, 2019
Published online: Sep 24, 2019
Published in print: Dec 1, 2019
Discussion open until: Feb 24, 2020
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