科研之友
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摘要
Active mass damper (AMD) control of civil structures has attracted much attention in recent years. However, there are few researches on the control of nonlinear structure using AMD under earthquake excitation, especially for high-rise building. In this paper, a fuzzy logic-based control algorithm was developed to control a nonlinear high-rise structure under earthquake excitation using AMD device. For the control of a high-rise building under earthquake excitation, due to the complexity of vibration modes, many inputs are needed for the fuzzy controller, and this may cause the explosion of fuzzy rules. To solve this problem, generalized inputs for fuzzy control were proposed by considering all the states of the structure based on a quadratic performance index. An AMD control system may magnify the interstory drift of a high-rise nonlinear building, which is regarded as Interstory Response Amplification (IRA) phenomenon. To avoid this problem, a control scheme of using both an AMD and interstory dampers was proposed to control the nonlinear vibration of a high-rise structure. We used a 20-story Benchmark nonlinear structure for the numerical studies. Numerical simulations show that the combination of an AMD and interstory dampers can eliminate the IRA phenomenon and achieve better vibration suppression than either an AMD alone or interstory dampers alone, in not only displacements relative to ground but also interstory response.
