Pk. Woodward et Dv. Griffiths, INFLUENCE OF VISCOUS DAMPING IN THE DYNAMIC ANALYSIS OF AN EARTH DAM USING SIMPLE CONSTITUTIVE MODELS, Computers and geotechnics, 19(3), 1996, pp. 245-263
The results of dynamic non-linear two-dimensional finite element analy
ses of the Long Valley Dam in the Mammoth Lake area of California subj
ected to a real measured earthquake are presented. A simple elastic-pe
rfectly plastic constitutive soil mode is used to describe the stress-
strain response of the soil and Rayleigh damping (i.e. viscous damping
) is applied to account for the lack of hysteretic damping. The effect
of the initial stress condition and the Rayleigh damping ratio are di
scussed, and the results of the analysis are compared to th measured r
esponse of the dam and to results presented by previous researchers. G
ood agreement is obtained in the up/downstream direction, but as exper
ienced by previous researchers, the correct vertical frequency range i
s not achieved. The limitations of using viscous damping combined with
simple constitutive models when studying the dynamic behaviour of rea
l earth dams ar shown. Copyright (C) Elsevier Science Ltd.