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Procedure for Estimating Shear-Induced Seismic Slope Displacement for Shallow Crustal Earthquakes

Bray, Jonathan D. / Macedo, Jorge

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 $k_{y}$ , its initial fundamental period $T_{s}$ , the ground motion’s spectral acceleration at a degraded period of the slope taken as $1.3 T_{s}$ , 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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Procedure for Estimating Shear-Induced Seismic Slope Displacement for Shallow Crustal Earthquakes

Bray, Jonathan D. / Macedo, Jorge

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 $k_{y}$ , its initial fundamental period $T_{s}$ , the ground motion’s spectral acceleration at a degraded period of the slope taken as $1.3 T_{s}$ , 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.

Procedure for Estimating Shear-Induced Seismic Slope Displacement for Shallow Crustal Earthquakes

Bray, Jonathan D. / Macedo, Jorge

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 $k_{y}$ , its initial fundamental period $T_{s}$ , the ground motion’s spectral acceleration at a degraded period of the slope taken as $1.3 T_{s}$ , 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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Title:

Procedure for Estimating Shear-Induced Seismic Slope Displacement for Shallow Crustal Earthquakes

Contributors:

Bray, Jonathan D. (author) / Macedo, Jorge (author)

Published in:

Journal of Geotechnical and Geoenvironmental Engineering ; 145

Publication date:

2019-09-24

ISSN:

1090-0241 , 1943-5606

DOI:

https://doi.org/10.1061/(ASCE)GT.1943-5606.0002143

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

Unknown

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