Application of Mode-Adaptive Bidirectional Pushover Analysis to an Irregular Reinforced Concrete Building Retrofitted via Base Isolation

In this article, the applicability of mode-adaptive bidirectional pushover analysis (MABPA) to base-isolated irregular buildings was evaluated. The point updated MABPA is that peaks first and second modal responses are predicted considering energy balance during a half cycle structural response. numerical examples, main building former Uto City Hall, which severely damaged in 2016 Kumamoto earthquake, investigated as case study for retrofitting an reinforced concrete using base-isolation technique. comparisons between peak response by nonlinear time-history results showed relative displacement can be properly MABPA. also performance retrofitted models satisfactory ground motion considered study, including recorded motions earthquake.