NEHRP Clearinghouse

Title
A Simplified Procedure for Estimating Earthquake-Induced Deformations in Dams and Embankments.
File
PB276820.pdf
Author(s)
Makdisi, F. I.; Seed, H. B.
Source
National Science Foundation, Washington, D.C., August 1977, 70 p.
Identifying Number(s)
UCB/EERC-77/19
Abstract
The inadequacy of the pseudo-static approach recommended by the International Committee on Large Dams, to predict the behavior of low embankments during earthquakes has been clearly recognized and demonstrated. The committee pointed out the need for early revision of the method which 'in several instances...predicts a safe condition for dams which are known to have had major slides.' This report presents a simplified procedure for the seismic design of small embankments. The method is an approximate one which uses the concept, originally proposed by Newmark, for calculating permanent deformations, but it is based on an evaluation of the dynamic response of the embankment rather than rigid body behavior. The method is applied to dams with heights in the range of 100 to 200 ft and constructed of compacted cohesive soils or very dense cohesionless soils. Design curves on the basis of analyzed cases are presented with an example problem. The method is an approximate one and involves simplifying assumptions. The design curves are averages based on a limited number of cases and should be updated as more data become available.
Keywords
Dynamic response; Acceleration (Physics); Ground motion; Dams; Earthquake engineering; Loads (Forces); Seismic design; Earth dams; Earthquakes; Finite element analysis; Deformation; Embankments; Seismic waves