This study aims at evaluating the influence of epistemic uncertainties in shear wave velocity (VS) on seismic ground response analyses (GRAs). A number of alternative VS profiles obtained from both invasive (i.e., borehole) and non-invasive (i.e., surface waves) testing methods are available for two blind study sites. These profiles are used to estimate epistemic uncertainties in VS, which are then propagated through equivalent linear-elastic GRAs, allowing for the quantification of intra-method uncertainty and inter-method variability in terms of spectral accelerations, amplification functions, and ‘damage parameters’ (i.e., Arias and Housner intensities). This study demonstrates that nonlinearity of soil response plays a fundamental role in increasing the propagated uncertainty in GRA. Additionally, GRAs were also performed by means of VS upper/lower range profiles developed from assumptions commonly used to account for epistemic uncertainties. These VS profiles were found to yield unrealistic site response estimates for both low strain (i.e., linear-elastic) and high strain (i.e., non-linear) levels.
|Titolo:||Influence of epistemic uncertainty in shear wave velocity on seismic ground response analyses|
|Data di pubblicazione:||2019|
|Digital Object Identifier (DOI):||10.1193/011018EQS005M|
|Appare nelle tipologie:||1.1 Articolo in rivista|
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