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Publication - Dr Irina Lazar

    Reliability of vibration-supressed structures under seismic loads

    Citation

    Lazar, I & Radu, A, 2018, ‘Reliability of vibration-supressed structures under seismic loads’.

    Abstract

    This paper investigates the reliability of multi-storey buildings subjected to seismic loads and
    equipped with tuned-inerter-damper (TID) vibration suppression systems. The inerter, equivalent to a capacitor in the electrical domain, produces a force proportional to the relative acceleration across its two terminals. The TID is a newly developed vibration suppression system, where the inerter replaces the mass element of a traditional tuned-mass-damper (TMD). The studies carried out to date focused on the use of TIDs modelled inside single or multi-storey linear host structures,
    generally subject to simplified loading patterns, such as sinusoidal waves or singular earthquake
    time-history records.

    Although previous work aided the understanding of the TID dynamics and showed its advantages over alternative passive control systems (such as TMDs and viscous dampers), it is necessary to perform more in-depth studies, where the simplifying assumptions are gradually dropped. Numerical examples of structures modelled as non-linear multi-degree-of-freedom (MDOF) systems, equipped with TIDs, and subjected to synthetic ground-motion records, are shown. The effects of using the proposed vibration suppression system are presented in terms of reliability metrics, such as crossing rates of displacements over critical thresholds, probability of failure and time duration until the failure. In addition, the differences in the structural responses of the
    controlled and uncontrolled MDOF systems is shown for the NGA-West dataset of earthquake
    records.

    Full details in the University publications repository