Dynamic behaviour analyses for a pile-supported structure with a MLS through 1g shaking table tests

Abstract

In this study, 1g shaking table tests were conducted to evaluate the seismic performance of a pile-supported structure incorporating a magnetic levitation system (MLS). The MLS was designed by installing electromagnets on the pile caps and permanent magnets on the underside of the deck. First, frequency sweep tests were conducted to determine the natural frequency of the MLS, confirming a significant isolation effect when the MLS was applied. Next, the acceleration phase characteristics with the application of MLS were analyzed. The results showed that the proposed MLS incurs a slight increase in response at long-period range but a significant decrease in response within the short-period range, which has a substantial impact on the structural behaviour. This indicates improvement in seismic stability performance, particularly in mitigating risks during critical-period events.