Parametric Study of Slender and Dynamically Sensitive Buildings with Tuned Liquid Dampers Subject to Seismic Events




Hossein, Musaddeque

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Slender and dynamically sensitive buildings have insufficient inherent damping to mitigate harmful oscillations during seismic events and must use other means to increase damping. Passive damping methods such as Tuned Liquid Dampers (TLD) offer a low cost and effective means of damping. While several tower type buildings in the United States have utilized TLDs to mitigate wind induced oscillations, none have been used for reducing seismic induced oscillations. Currently there are no guidelines that allow the structural designer to design and evaluate the benefit and constructability of TLDs for mitigating structure response for a design seismic event. As a first step towards the development of such a guideline, a computational tool that is based on the coupling of computational fluid dynamics (CFD) analysis and structural analysis is developed in this study. The parametric study is performed on a tall and dynamically sensitive structure with TLDs of various dimensions and fluid depths for several design seismic events using the tool developed. The computational tool developed in this study provides an effective and inexpensive way to analyze the responses of the tall and dynamically sensitive buildings with TLDs subject to a design seismic event, which can identify essential elements that will provide the means of selecting and optimizing liquid damper design for mitigating structure response to selected earthquakes. The results of the parametric study show that the TLDs can be effective in reducing structure oscillations when the structure oscillation without the TLDs is within a certain range. When the structure oscillation exceeds this range, the structure stiffness must be increased. The results also show that regardless of the TLD dimension, the TLD response lags the structure response and consequently, the damping produced by TLDs will be more effective for reducing the oscillations induced by long period earthquakes.



TLD, Tuned liquid damper, Fluid structure interaction, Tall building vibration response, CFD, Seismic oscillation reduction with TLD