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- Title
Fuzzy Control for Seismic Protection of Semiactive Base-Isolated Structures Subjected to Near-Fault Earthquakes.
- Authors
Zhao, Dahai; Li, Yongxing
- Abstract
This paper proposes a new fuzzy logic controller, which is designed for seismic protection of base-isolated structures utilizing piezoelectric friction damper against near-fault earthquakes for different ground sites. According to the elastic design spectrum that Eurocode 8 recommends, one 5% damped elastic design spectrum for Chi-Chi earthquake is proposed to generate artificial earthquakes of different ground sites. The proposed controller employs a hierarchic fuzzy control algorithm, in which a supervisory fuzzy controller governs a sublevel fuzzy controller by altering its input normalization factors according to current level of ground motion. In order to simultaneously reduce the base displacement and superstructure responses of the base-isolated structure during seismic excitations, genetic algorithm is employed to optimize the supervisory fuzzy controller and the preload of piezoelectric friction damper. The efficiency of the proposed controller is also compared with passive controller and a linear quadratic Gauss optimal controller. Numerical results show that the proposed fuzzy logic controller has favorable performance in mitigating the responses of the base-isolated structure.
- Subjects
FUZZY control systems; EARTHQUAKE engineering; EN1998 Eurocode 8 (Standard); CHI-chi Earthquake, Taiwan, 1999; H2 control; DAMPERS (Mechanical devices); PIEZOELECTRICITY
- Publication
Mathematical Problems in Engineering, 2015, p1
- ISSN
1024-123X
- Publication type
Article
- DOI
10.1155/2015/675698