Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Simulating the Effects of Site Geometry and Earthquake Shaking Characteristics on Lateral Spread Displacements
Finite-element analyses are used to model earthquake-induced lateral spread sites and evaluate the effects of site geometry and ground motion intensity measures (IMs) on the computed lateral spread displacements. The analyses were generated with six different geometries, two densities for the liquefiable soils, and 38 different ground motions for a total of 456 analyses. A pore pressure ratio threshold of 0.5 was used to establish a criterion for liquefaction triggering to determine which IMs are best able to predict liquefaction triggering from non-triggering in the numerical models. Cumulative absolute velocity with a minimum acceleration threshold of 50 cm/s, normalized dissipated energy, and Arias Intensity all performed similarly for correctly predicting liquefaction triggering in the models. Cumulative absolute velocity with no minimum acceleration threshold was identified as the most efficient IM for predicting lateral spread displacements by having the smallest σln. The efficiency of the displacement prediction was only reduced by about 2%–3% when using intensity measures computed only from the part of the ground motion after liquefaction is triggered. Comparatively, including information about the geometry (i.e., height of free-face, thickness of liquefiable soils) of the lateral spread site reduces σln by a further 5%–20%.
Simulating the Effects of Site Geometry and Earthquake Shaking Characteristics on Lateral Spread Displacements
Finite-element analyses are used to model earthquake-induced lateral spread sites and evaluate the effects of site geometry and ground motion intensity measures (IMs) on the computed lateral spread displacements. The analyses were generated with six different geometries, two densities for the liquefiable soils, and 38 different ground motions for a total of 456 analyses. A pore pressure ratio threshold of 0.5 was used to establish a criterion for liquefaction triggering to determine which IMs are best able to predict liquefaction triggering from non-triggering in the numerical models. Cumulative absolute velocity with a minimum acceleration threshold of 50 cm/s, normalized dissipated energy, and Arias Intensity all performed similarly for correctly predicting liquefaction triggering in the models. Cumulative absolute velocity with no minimum acceleration threshold was identified as the most efficient IM for predicting lateral spread displacements by having the smallest σln. The efficiency of the displacement prediction was only reduced by about 2%–3% when using intensity measures computed only from the part of the ground motion after liquefaction is triggered. Comparatively, including information about the geometry (i.e., height of free-face, thickness of liquefiable soils) of the lateral spread site reduces σln by a further 5%–20%.
Simulating the Effects of Site Geometry and Earthquake Shaking Characteristics on Lateral Spread Displacements
Little, Michael V. (Autor:in) / Rathje, Ellen M. (Autor:in)
Geo-Congress 2022 ; 2022 ; Charlotte, North Carolina
Geo-Congress 2022 ; 278-287
17.03.2022
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
| British Library Conference Proceedings | 2022
| British Library Conference Proceedings | 2006
| British Library Online Contents | 2006