Abstract:
Base isolation is found to be effective in reducing the torsional response of structures with mass
eccentricity when subjected to earthquakes. In this study, dynamic characteristics of an eccentric five-storey
benchmark model, isolated with laminated rubber bearings (LRB) and lead core rubber bearings (LCRB),
were examined using a shake table and four different ground motions. The earthquake-resistant performance
of LRB and LCRB isolators was evaluated. It was observed that both transverse and torsional responses were
significantly reduced with the addition of an LRB or LCRB isolated system regardless of ground motion input.
However, the LRB was identified to be more effective than LCRB in reducing relative torsional angle,
model relative displacements, accelerations and angular accelerations, and therefore, provided a better protection
of the superstructure and its contents.
