Numerical Study On The Frequency-dependent Viscous Damping In
Dynamic Response Analyses Of Ground
Author(s)
G. Lanzo, A. Pagliaroli & B.D 'Elia
Abstract
Numerical study on the frequency-dependent
viscous damping in dynamic response analyses
of ground
G. Lanzo, A. Pagliaroli & B. D'Elia
Department of Structural and Geotechnical Engineering,
University of Rome "La Sapienza", Rome, Italy
Abstract
The effects of local soil conditions on ground motion are commonly evaluated by
performing either frequency or time domain analyses. Time domain analyses
usually incorporate in the equations of motion viscous damping which is
generally assumed to be of the Rayleigh type, i.e. stiffness- and massproportional,
or in a simplified form, only stiffness-proportional. These two
formulations result in a different dependency of damping from frequency. In
order to evaluate the impact of the viscous damping formulations on site
response, several linear analyses were conducted for an idealised soil deposit
with different computer codes. The results of the analyses show that the use of
the simplified Rayleigh damping formulation can significantly underestimate the
r
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