Comparative Analysis of Seismic–Induced Vibration Response Control in Multi–Inerter–Negative Stiffness Damped Outrigger Systems

The functionality and structural safety of super high–rise buildings are significantly challenged during seismic events. Although conventional damped outrigger (CDO) systems effectively mitigate seismic–induced vibrations, the energy dissipation capacity remains inherently limited. An inerter, with lightweight tuning capabilities and dynamic negative stiffness characteristics, can significantly enhance energy dissipation efficiency when integrated with negative stiffness elements. To enhance the control performance of seismic–induced vibrations, this study proposes a multi–inerter–negative stiffness damped outrigger (INSDO) system and focuses on different INSDO combinations to improve the seismic responses of super high–rise buildings. Taking a dual–outrigger system as an example, this study systematically compares the seismic performances of five INSDO configurations. The results demonstrate that all these five outrigger configurations achieve notable damping performances, with the INSDO AND INSDO combination delivering optimal outcomes. This improvement is attributed to the synergistic interaction between the inerter and the negative stiffness elements, which enhances the damper’s hysteretic performance and significantly improves its energy dissipation capacity. The energy dissipation of the INSDO AND INSDO configuration exceeds that of the single INSDO system by 71.37%.

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