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Current design practices for base-isolated structures in Japan typically involve conducting time-history analysis using a single seismic component. However in reality the isolation system has a bidirectional response which means that the damage of seismic isolation devices may be underestimated during design procedure. This is particularly true for the object of the present study U-shaped steel dampers -, which were proved to have a reduced ultimate deformation capacity under bidirectional loading. The present study conducts a quantitative comparison between the results obtained using: (1) a 1D model (SDOF system with single component of the ground motion), and (2) a 2D model (MSS with 2DOFs and both components of the ground motion). Different seismic design levels were investigated and several formulae for predicting the bidirectional damage using indicators based on one-directional analysis were proposed.

EFFECT OF BI-DIRECTIONAL GROUND MOTIONS ON THE DAMAGE EVALUATION OF U-SHAPED STEEL DAMPERS FOR BASE-ISOLATED STRUCTURES