Location

St. Louis, Missouri

Session Start Date

3-11-1991

Session End Date

3-15-1991

Abstract

A simplified method of inelastic seismic analysis of earth dams developed by the authors is used to study the response of the San Fernando and Santa Felicia dams to accelerograms recorded in the 1971 San Fernando Earthquake. The method involves two separate stages. In stage I, the dam is discretized into finite elements and is subjected to horizontal static inertia-like forces; its nonlinear deformation is computed using a plane strain code, while the applied horizontal forces are gradually increased until large enough strains develop in most elements of the dam. The results of this analysis are utilized to derive realistic nonlinear stress-strain relationships for layer super-elements consisting of horizontal rows of finite elements. Then, in stage II of the analysis, the dam is discretized as a one-dimensional layered triangular shear beam, in which each layer's constitutive relation stems from the nonlinear stress-strain super-element relation determined in the previous stage. The dynamic response of the dam is then computed using (with small modifications) existing nonlinear shear beam formulations. The results of the analysis for San Fernando and Santa Felicia Dams are presented and compared with the results of two-dimensional "equivalent-linear" and "kinematic-plasticity" methods. Considerable insight is gained into the nature of the nonlinear seismic response of embankment dams.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Meeting Name

Second Conference

Publisher

University of Missouri--Rolla

Publication Date

3-11-1991

Document Version

Final Version

Rights

© 1991 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Mar 11th, 12:00 AM Mar 15th, 12:00 AM

Inelastic Seismic Response of San Fernando and Santa Felicia Dams

St. Louis, Missouri

A simplified method of inelastic seismic analysis of earth dams developed by the authors is used to study the response of the San Fernando and Santa Felicia dams to accelerograms recorded in the 1971 San Fernando Earthquake. The method involves two separate stages. In stage I, the dam is discretized into finite elements and is subjected to horizontal static inertia-like forces; its nonlinear deformation is computed using a plane strain code, while the applied horizontal forces are gradually increased until large enough strains develop in most elements of the dam. The results of this analysis are utilized to derive realistic nonlinear stress-strain relationships for layer super-elements consisting of horizontal rows of finite elements. Then, in stage II of the analysis, the dam is discretized as a one-dimensional layered triangular shear beam, in which each layer's constitutive relation stems from the nonlinear stress-strain super-element relation determined in the previous stage. The dynamic response of the dam is then computed using (with small modifications) existing nonlinear shear beam formulations. The results of the analysis for San Fernando and Santa Felicia Dams are presented and compared with the results of two-dimensional "equivalent-linear" and "kinematic-plasticity" methods. Considerable insight is gained into the nature of the nonlinear seismic response of embankment dams.