VARIABLE FRICTION DAMPERS FOR EARTHQUAKE PROTECTION OF COUPLED BUILDING STRUCTURES

This study mainly focuses on the development and application of variable friction damper as a joint control device to enhance the seismic resistance of a main building with podium structure. Shaking table tests using small scale building structures and damper were performed to provide a realistic demonstration and evaluation of effectiveness of the proposed control scenario. The real-time adjustment of the small scale variable friction damper was mechanically realized by using a piezoelectric actuator. A local feedback controller was proposed and implemented in the coupled building system. The improved performance over the uncontrolled cases, including uncoupled and rigid coupled configuration, was verified by considering four simulated historical earthquakes. The test results showed that prompt regulation of friction force by the piezoelectric actuator can be achieved, and the desired control performance and robustness can be guaranteed. The proposed local feedback controller also demonstrated an increased seismic resistance to the coupled system.