Location

San Diego, California

Session Start Date

5-24-2010

Session End Date

5-29-2010

Abstract

One of the most important aspects that must be considered in design of embankment dams is to assess their stability during seismic events. When employing sophisticated approaches like finite element method for dynamic analysis of the mentioned structures against earthquake attacks, difficulties in evaluation of input parameters may exist. Hence employing simpler approaches like pseudo static method are still preferred by some designers. However, there is a problem associated with the pseudo static procedure as there is no organized technique for precise evaluation of horizontal seismic coefficient. Moreover, this method applies "safety factor" for the stability evaluations which is not a consistent value when different methods of analysis are employed. In this paper it is tried to suggest a method for a more organized evaluation of horizontal seismic coefficient in the range of empirical values used currently. Meanwhile “displacement” is applied as an appropriate parameter to evaluate the serviceability levels after an earthquake incident. In order to fulfill this goal, typical homogenous embankments were analyzed using shear beam approach to assess their horizontal seismic coefficients. Then Newmark sliding block model was employed to establish a relationship between assessed horizontal seismic coefficients and expected permanent displacements. Moreover, an equation was derived to assess yield acceleration on the basis of shear beam method principles.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

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

Meeting Name

Fifth Conference

Publisher

Missouri University of Science and Technology

Publication Date

5-24-2010

Document Version

Final Version

Rights

© 2010 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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May 24th, 12:00 AM May 29th, 12:00 AM

Assessing Horizontal Seismic Coefficients in Earth Dams with Regards to Expected Deformation

San Diego, California

One of the most important aspects that must be considered in design of embankment dams is to assess their stability during seismic events. When employing sophisticated approaches like finite element method for dynamic analysis of the mentioned structures against earthquake attacks, difficulties in evaluation of input parameters may exist. Hence employing simpler approaches like pseudo static method are still preferred by some designers. However, there is a problem associated with the pseudo static procedure as there is no organized technique for precise evaluation of horizontal seismic coefficient. Moreover, this method applies "safety factor" for the stability evaluations which is not a consistent value when different methods of analysis are employed. In this paper it is tried to suggest a method for a more organized evaluation of horizontal seismic coefficient in the range of empirical values used currently. Meanwhile “displacement” is applied as an appropriate parameter to evaluate the serviceability levels after an earthquake incident. In order to fulfill this goal, typical homogenous embankments were analyzed using shear beam approach to assess their horizontal seismic coefficients. Then Newmark sliding block model was employed to establish a relationship between assessed horizontal seismic coefficients and expected permanent displacements. Moreover, an equation was derived to assess yield acceleration on the basis of shear beam method principles.