Effect of the foundation stiffness on the response of a seismically isolated tank under SSE conditions
conference paper
This paper presents the results of a feasibility study of a seismic isolated 120.000 m<sup>3</sup> LNG tank. A simple model was used to evaluate the seismic response of the isolated tank under Safe Shutdown Earthquake conditions. The frequency 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 fulllayered 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 response and underestimation of the impulsive tank response, (b) soft soil sites may be suitable for seismic base isolation, and (c) that even if base isolation is, in general, more effective for stiff soil conditions, site response analysis should be always carried out.
Topics
TNO Identifier
280249
ISSN
1361617X
Publisher
WITpress
Source title
Fourth International Conference on Earthquake Resistant Engineering Structures, ERES IV, 22-24 September 2003, Ancona, Italy
Editor(s)
Latini, G.
Brebbia, C.A.
Brebbia, C.A.
Collation
10 p.
Pages
213-222
Files
To receive the publication files, please send an e-mail request to TNO Repository.