Structural Response of a Base-Isolated Building Subjected to Extreme Actions

This paper presents the results of a comprehensive analysis conducted on a reinforced concrete frame structure subjected sequentially to extreme actions, namely seismic events and explosions. The structure was evaluated under two different foundation configurations: a traditional fixed-base (rigidly embedded in the ground) and a modern base-isolated system using Lead Rubber Bearings (LRB). Structural analyses were carried out in the elastic domain: the response spectrum method was applied for seismic actions, while a linear dynamic analysis using time-history functions was employed for explosions. The results emphasize the significant contribution of the elastomeric bearings to the structural response under both types of extreme loading scenarios.