DECENTRALIZED SEMI-ACTIVE SEISMICCONTROL USING FUZZY CONTROLLER

There are many different methods to find required control forces or damping values to decrease structural responses due to seismic excitations by a one centralized controller. In tall buildings there are some additional problems like time delay and controller unreliability, because of the higher number of sensors, actuators or dampers. In this paper, a decentralized semi-active control algorithmis proposed. In decentralized control,the structural system is decomposed into several substructures. Different controllers are available each one dealing with one substructure to obtain control properties using a certain that may be different to other subsystems control forces or natural characteristics modifications are applied just to the respective substructure. In present study, based on local substructure information, fuzzy controller calculates damping values for its subsystem.Each controller receives displacement and acceleration values of its floor as feedbacks and controls them. Controlling these values automatically results in decreasing of story drift and other useful values. The effectiveness of decentralized semi-active control algorithms is demonstrated through numerical examples. A model of building subjected to seismic excitations is developed and the dynamic responses are obtained in both uncontrolled and controlled cases by employing proposed decentralized control method. Moreover, the results for controlled case are compared to those obtained by using available decentralized methods to show the efficacy of the proposed algorithm.