A Simple Critical Response Evaluation Method for Base-Isolation Building-Connection Hybrid System Under Double Impulse as Representative of Near-Fault Ground Motion

We revisit a unique building system including base-isolation, building-connection hybrid control system. The base-isolation withstands pulse-type earthquake ground motions effectively and the resists long-duration efficiently. A simple smart critical response evaluation method without nonlinear time-history analysis is proposed for this under near-fault motions. An analytical expression of maximum elastic-plastic deformation damped bilinear hysteretic single-degree-of-freedom (SDOF) model double impulse as representative derived in our previous paper plays an important role development method. two-step transformation procedure into SDOF proposed. first step main base-isolated second reduction connecting dampers supported on sub to damper with sophisticated compensation factor assumed rigid wall. damping coefficients consideration yielding story key paper. Different from work, equivalent coefficient depending range before after story. This treatment enhances accuracy reliability demonstrated by multi-degree-of-freedom (MDOF) model.