Seismic Analysis of Five-Storied Building Using U-Shaped Hybrid Isolator and Lead Rubber Bearing Isolator

Base isolation is a technique that has been used to protect structures from the damaging effect of earthquakes. The addition of isolators at the base improves the building structures’ adaptability. The majority of the fundamental isolation solutions created over time only offer “partial” isolation. “Partial” in the sense that the structure's flexibility and energy dissipation mechanisms, along with the incorporation of base isolation devices, are mostly responsible for reducing the force transferred and the ensuing responsive motions. U-shaped hybrid (steel plus rubber) dampers dissipate energy through elasto-plastic deformation and control earthquake ground motion. The aim of this research is to assess the effectiveness of a U-shaped hybrid system in reducing base shear and storey drift. In this research, the effectiveness of a U-shaped damper is compared to that of a lead rubber bearing (LRB) isolator by attaching it to a five-storey building. Using SAP2000 software, nonlinear time history analysis was carried out. This research found that the use of a U-shaped hybrid isolator was beneficial in minimizing structural responses, which may result in less damage.