Amin KAVEI DEYLAMI - MSc Student, School of Civil Engineering, University of Tehran,P.O. Box ۱۱۱۵۵-۴۵ ۶۳, Tehran, Iran
Amir K.GHORBANI-TANHA - Assistant Professor, School of Civ il Engineering, University of Tehran, aP.O. Box ۱۱۱۵۵-۴۵۶۳, Tehran, Iran

There are many different methods to find required control forces or dam ping values to decrease structural responses due to seismic e xcitations by a one centralized controller. In tall buildings there are some additional problems like time dela y and controller unreliability, because of the hi gher number of sensors, actuators or dampers. In this paper, a decentralized semi-active control al gorithmis proposed. In decentralized control,the structural s ystem is decomposed into several substructures. Different controllers are available each one dealing with on e 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.E ach controller receives displacement and acceleration values of its floor as feedbacks and controls them. C ontrolling 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 excitatio ns is developed and the dynamic responses are obtained in both uncontrolled and controlled cases b y employing proposed decentralized control method. Mor eover, the results for controlled case are compar ed to those obtained by using available decentralized methods to show the efficacy of the proposed algorithm .

Decentralized Control, Semi-active Control, Fuzzy Control, Tall Buildings, Seismic Control