Fuzzy Control of Seismic Structure with an Active Mass Damper

Fuzzy theory is highly promising for active structural control. The advantage of fuzzy controllers over classical controllers is the limited number of measured structural responses used to implement the control rules and its intrinsic robustness. In this paper, Fuzzy rules were generated firstly by learning from sample data obtained from the performance of the system under optimal control algorithm. Secondly, the numerical simulation was carried out to verify the effectiveness of the designed fuzzy controllers. Lastly, Shaking table tests of a 1:8 scaled twelve-story steel frame structure using an active mass damper driven by fuzzy controller were conducted. The simulation and test results showed that the fuzzy controllers were very effective in reducing the response of model structure under seismic excitation and reductions of 40%∼60% in displacements could be achieved, Moreover, modified fuzzy control system considering the influence of multiple inputs had a better structural vibration control effect.