Seismic analysis of a multi-storied irregular steel building with different types of dampers and base isolation systems

This study investigates the seismic performance of a G + 10 multi-storied irregular steel building with L-shaped and T-shaped configurations, focusing on the effectiveness of damping and base isolation systems. The research aims to analyze the structural response of the building under various seismic conditions using ETABS software, considering damping mechanisms (viscous and friction dampers) and base isolation techniques (friction pendulum system and lead plug bearing). The study explores different seismic zones (II, III, IV, and V) and soil conditions (rock, medium, and soft soil) to assess parameters such as storey drift, storey displacement, and base shear. The findings reveal that hybrid combinations of damping and base isolation techniques significantly enhance seismic resilience, with friction pendulum bearings and lead plug bearings providing superior performance. The application of hybrid systems led to a reduction in seismic responses by up to 50% in high-risk zones. The T-shaped buildings exhibited higher seismic responses than L-shaped structures due to their geometric irregularity, but optimized damping and isolation systems mitigated these effects. The research also highlights the critical role of soil-structure interaction, with soft soil amplifying seismic forces by 40–50%. These findings emphasize the need for advanced seismic mitigation strategies, particularly for irregular steel structures in earthquake-prone areas. The results offer valuable insights for structural engineers and policymakers, advocating for the integration of hybrid damping and base isolation systems in seismic design codes.