Construction of an Active Control System for Seismically Excited Structures Using Fuzzy Logic Techniques

The design and analysis of seismically excited structural control systems should be based on the best available knowledge and information instead of the simplest available model when handling uncertainties in the civil structural system. Therefore, seismic structural control system is developed using fuzzy logic due to its capacity to formalize approximate reasoning processes, i.e., a knowledge-based method. This paper focuses on the application of fuzzy logic in the construction of active controls of seismically excited structures. The inference rule base of fuzzy controller is designed based on the input/output data obtained from the performance of the control system with a state feedback controller. To test the performance of fuzzy logic based control of seismic structures, a simulation system was built using MATLAB/Simulink software. The simulation results show that the fuzzy control method is robust and efficient for reducing seismically excited structural vibrations in low frequency regions. In addition, the benefits and limitations of the fuzzy logic based control are discussed.