Dissertation

Study of Seismic Behavior of 3-story Building Model with Liquid Tank on Top Floor and Combined Behavior with Friction Dampers

Damping is defined as the behavior of the building to absorb the input energy. This damping behavior of the building can be improved by adding dampers. The primary goal of this experiment was to assess the impact of installing a liquid-filled tank (either water or oil) on top of a structure subjected to seismic loads. The main criteria used to assess the differences in performance were acceleration and displacement at the top of the structure. Specifically, a 3-story scaled model was used and subjected to a series of different loading protocols (namely pulse, sweep, and earthquake time history loadings) on a shake table. Results indicate that the natural frequency and the maximum roof displacement of the model decreased, while damping ratios increased with the addition of a liquid filled tank. The secondary goal of this study was to see the behavior of the model when wooden slotted bolted friction dampers were added to the system. The model was loaded with the same loading protocols as before and with an additional sine load. Results showed a decrease in the vibration frequency and a significant increase in damping ratio due to the added friction dampers. In conclusion, a building with a liquid tank – water or oil, can provide more damping effect to a building and this may improve the seismic safety of building structures when appropriate volume of the liquid is filled in the tank and is much effective when used with friction dampers.

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