A loss-based control algorithm for magnetorheological dampers combined with earthquake early warning

This paper presents a methodology that combines the use of magnetorheological (MR) dampers together wi th an earthquake early warning (EEW) system to minimize the losses i n a structure about to be struck by an incoming gro und motion. MR dampers can generate relatively large controllable damping forces by tuning the viscosity of an MR flu id through a control voltage. Their mechanical simplicity, fast response time, and low electric power requirements make the m attractive for potential applications in earthquake engineering, p articularly when combined with EEW. In this paper, a control algorithm is developed to etermine the command voltage of the MR damper base d on the expected ground shaking predicted by an EEW system. A genera l framework is introduced that develops a performan ce-based (i.e., loss-based) control algorithm for semi-active devic s ombined with an EEW system. A simplified storybased buildingspecific component-based loss estimation is used in the proposed framework, combining real-time, EEW-b ased seismic hazard, nonlinear dynamic structural simulation, da mage fragility and loss. For illustrative purposes, the control algorithm is implemented on a generic three-story building struc ture equipped with a small-scale MR damper prototyp e. Results reveal that the developed EEW-based control alg rithm can effectively reduce the expected loss of the considered case-study structure.

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