Role Of Hysteretic Damping In The Earthquake Response Of Ground
Author(s)
N. Yoshida
Abstract
Parametric studies are carried out to investigate the role of the hysteretic
damping in earthquake response analysis. The maximum acceleration is found to
have an upper bound under very large earthquakes and hysteretic damping does
not affect it. On the other hand, response acceleration becomes large in the
shorter period as the hysteretic damping increases. It comes because stiffness
after the unloading becomes large so as to increase the hysteretic damping ratio,
which is a quite different feature that viscous damping has although they are
usually understood to have the same mechanical nature.
Keywords: earthquake, hysteretic damping, shear strength, upper bound
acceleration.
1 Introduction
Nonlinear behaviour of soils for the earthquake response analysis of ground is
usually defined by strain dependent shear modulus and damping ratio. As such,
damping ratio is supposed to be an important mechanical property. It has been
supposed to supress the earthquake response; earthquake motion becomes
smaller as the damping ratio increases.
On the other hand, the authors showed a different point of view [1].
Maximum acceleration does not exceed the upper bound acceleration under the
large ground motion. It means that damping ratio does not work so as to supress
the ground acceleration at the ground surface. Instead, another aspect is found;
response at high frequency is excited as the damping ratio.
In the previous study, however, only one example was shown. A series of
parametric study is carried out in this paper in order to see what happens when
the hysteretic damping changes.
Keywords
earthquake, hysteretic damping, shear strength, upper bound
acceleration
Related Book
Other papers in this volume
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