Effect Of The Foundation Stiffness On The Response Of A Seismically
Isolated Tank Under SSE Condition
Author(s)
G. Esposito & W. Courage
Abstract
Effect of the foundation stiffness on the
response of a seismically isolated tank under
SSE conditions
G. Esposito & W. Courage
TNO Building and Construction Research,
Civil InJi.astructures, Delf The Netherlands
Abstract
This paper presents the results of a feasibility study of a seismic isolated 120.000
m3 LNG tank. A simple model was used to evaluate the seismic response of the
isolated tank under Safe Shutdown Earthquake conditions. The fkequency
dependent dynamic stiffness of the foundation was modeled by means of
Boundary Elements. Three possible construction sites were assessed. For each
site, two different foundations were considered, namely a rigid base and the hlllayered
foundation model. For each foundation, modeling was carried out with
and without base isolation. The results of the study in form of base shear force,
base overturning moment, and height of the sloshing modes showed that (a) use
of fixed-base response spectra leads to the overestimation of the tank impulsive
respons
Keywords
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