Effect of Seismic Isolation on the Performance of High-Rise Buildings with Torsional Instability

Seismic bearings have been used to mitigate the harmful effect of earthquakes. Torsion mode, one most important irregularities, generally increases shear forces vertical members such as columns and walls in turn this may results brittle failure reinforced concrete (RC) members. Accordingly, it is vital eliminate torsion mode or switch higher modes with lower mass contribution. This study has evaluated seismic performance a high-rise building through push-over analysis including nonlinear time history analyses. The damage conditions RC structural are defined considering Eurocode definitions general assessments accordingly. Lead rubber for base isolation system. By using enough number bearings, dominant (first free vibration mode) shifted modes. Various earthquake records non-linear dynamic evaluate positive effects bearings. revealed that proper arrangement plan ground floor can effectively improve behavior high rise torsional instability achieve better performance.