Cumulative Absolute Velocity Models for Use in Liquefaction Engineering
Publication: Geo-Congress 2022
ABSTRACT
A new conditional ground-motion model (CGMM) and a set of scenario-based models for estimating cumulative absolute velocity (CAV) for earthquakes in shallow crustal tectonic settings are derived in this study. Random-effects regressions are performed to develop the CGMM, with random effects across different earthquakes. By combining the CAV CGMM with ground-motion models (GMMs) in shallow crustal earthquake zones for PGA, new scenario-based models are developed for estimating the median CAV and its standard deviation, directly from an earthquake scenario and site conditions. A scenario-based CAV model captures inherently the complex ground-motion scaling effects included in the GMMs for spectral accelerations on which it is based on, such as, sediment-depth effects, soil nonlinearity effects, and regionalization effects. This approach also ensures consistency between the estimated CAV values and a design spectral acceleration response spectrum. Finally, we provide an example for the use of the conditional and scenario-based models to estimate CAV hazard curves, which play an important role in liquefaction engineering.
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Geo-Congress 2022
Pages: 638 - 648
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Published online: Mar 17, 2022
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