The active control problem of seism-excited civil structures has attracted considerable attention in recent years. In this paper, conventional, hedge-algebras-based and optimal hedge-algebras-based fuzzy controllers, respectively denoted by HAFCs and OHAFCs, are designed to suppress vibrations of a structure against earthquake. The interested structure is a building modeled as a four-degrees-of-freedom structure system with one actuator, which is an active tendon, installed on the first floor. The structural system is simulated against the ground motion, acting on the base, of the El Centro earthquake (Mw = 7.1) in the USA on 18 May 1940. The control effects of FC, HAFC and OHAFC are compared via the time history of the floor displacements and velocities, control error and control force of the structure.
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