%A Fernando Gutiérrez-Urzúa
%A Fabio Freddi
%A JC De La Llera
%A JGF Crempien
%A JA Gallardo
%A JP Muñoz
%A Tiziana Rossetto
%A Sahin Dede
%A J Cembrano
%A Felipe Rivera
%A MF Chacón
%T Seismic Behavior of Isolated Structures under Subduction and Crustal Ground Motions: A Comparative Study
%B Proceedings of the 18th World Conference on Earthquake Engineering (18WCEE)
%D 2024
%I International Association for Earthquake Engineering (IAEE)
%L discovery10195542
%X Seismic isolation decouples the modal characteristics of the structure from those of the ground
motion, thus reducing structural demands, particularly under intense earthquakes. Seismic isolation is
particularly beneficial when used for strategic facilities such as hospitals, as it often allows the building to
remain operational in the aftermath of an earthquake-related disaster. Although the use of these devices is
widespread in earthquake-prone regions, there are still open issues that require to be studied. These open
issues include the performance and reliability of the seismic isolation systems when subjected to earthquakes
with characteristics that are different than those considered during the design. The present study investigates
the seismic performance of a case study isolated hospital with a high-damping rubber compound in Santiago,
Chile, considering sets of ground motions generated by either megathrust subduction or crustal fault
mechanisms. A 3D finite element model of a case study hospital is developed in OpenSees. Sets crustal
ground motions resulting from earthquake rupture scenarios on the San Ramon Fault are generated by the
UCSB method, which involves simulating a synthetic earthquake source with specified temporal and spatial
slip on the fault. Successively, sets of ‘equivalent’ recorded subduction ground motions are selected.
Incremental Dynamic Analyses (IDAs) are used to compute different local and global Engineering Demand
Parameters (EDPs) considering records from the two types of events (subduction vs. crustal), both considering
and not considering the vertical component of the ground motion. The results show the paramount importance
of considering different seismic sources to better understand/predict the seismic response of isolated
structures.
%C Milan
%O This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.