Abstract:
Base isolation is found effective in reducing 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 shaker 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, accelerationsand angular accelerations, and therefore, provided a
better protection of the superstructure and its contents.
