Shock Absorption Effect of Semi-active Mass Control Mechanism for Structure
Taiwan is located in the Circum-Pacific Seismic Zone and also at the junction of the Eurasian plate and the Philippine Sea plate, initiating sensible earthquakes to threaten the structural safety. Therefore, in order to enhance the seismic proof capability of structure, a new structural control mechanism, emerged passive control and active control, is proposed in this study. This mechanism can execute the “release” and “capture” of control mass block and only produce “negative” work on structure, based on the active mass control principle without power supply. A mathematical model of control law of this proposed mechanism is derived and the parameter study for single degree of freedom is executed to compare with those of structures without control and with passive tuned mass damper to obtain the optimal design parameters. Analysis results display that amplification of steady state reaction for structure with this semi-active control is much less than those of structure with passive control under within 0.03–0.07 and around 0.6–1.6. This proposed mechanism can “capture” and “release” the active control mass based on the direction and velocity of movement of the structural displacement.
The authors would like to acknowledge the support of Taiwan Ministry of Science and Technology through grant No. MOST-106-2221-E-260-003.
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