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Vibration Control Effectiveness of Soil-Irregular Building Systems equipped with Multiple Tuned Mass Dampers
This thesis deals with the analysis of dynamic characteristics of soil-irregular building interactive system, the MTMD parameter design considering the soil-structure interaction (SSI) effect, and the investigations of MTMD control effectiveness under bi-directional earthquake excitations. The optimal MTMD parameters are determined by minimizing the mean-square displacement response ratio contributed by the first three modes of controlled degree-of-freedom between the building with and without MTMD. According to this research, it is shown that the existence of SSI effect will reduce the modal frequencies of the combined building-soil system. Without considering the SSI effect, the MTMD probably does not tune to the right frequency, so that the detuning effect deteriorating the MTMD control effectiveness will occur. In this study, the MTMDs with the consideration of the SSI effect are useful as the buildings are built on hard soils. On the soft soil, the MTMDs become less effective in most situations because of the increase of system damping. Only for the slender building with significant foundation rocking, the MTMD control effectiveness is more obvious.
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