Seismic reductions investigation of semi-active base-isolated structure based on multi-level fuzzy control
ZHAO Da-hai 1, LI Yong-xing 1, LI Hong-nan 2, QIAN Hui 3
1. School of Civil Engineering and Mechanics, Yanshan University, Qinhuangdao 066004;
2. School of Civil Engineering, Dalian University of Technology, Dalian 116024;
3. School of Civil Engineering, Zhengzhou University, Zhengzhou 450001
A new type of fuzzy control controller, which is designed for seismic protection of a base-isolated building with piezoelectric friction damper, is presented in this study. The controller adopts a multi-level fuzzy control algorithm. The sub-level fuzzy controller is designed to determine the command voltage of the piezoelectric friction damper by the input of the acceleration and displacement of base floor. According to the current level of the seismic acceleration, the high-level fuzzy controller governs a sub-level fuzzy controller by altering its input quantization factors and scaling factor in real-time. The efficiency of the proposed multi-level fuzzy controller is also investigated through numerical simulations of a base-isolated structure. For comparison purpose, the traditional fuzzy controller and passive controller are conducted with the proposed multi-level fuzzy control method. Numerical results show that the developed fuzzy logic controller not only can successfully mitigate the displacement of base floor and the superstructure acceleration response, but also has favorably adaptability subjected to different intensity ground motions.
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