Electro-inductive devices have recently been introduced to implement passive control schemes in special classes of structures. Their fascinating feature is the feasibility of large devices, to be installed, for instance, in long span bridges, much shorter than hydraulic dampers with identical maximum span. The characterization of an electro-inductive device with semi-active behavior is presented in detail in this paper. The paper also discusses ways of building a semi-active device, and details its passive control function.
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