Velazquez Ortiz, O; Galasso, C; Duffour, P; (2020) A loss-based control algorithm for magnetorheological dampers combined with earthquake early warning. In: Proceedings Of The Sixteenth World Conference On Earthquake Engineering Santiago-Chili, 2017. WCEE: Santiago, Chile. (In press).

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Abstract

This paper presents a methodology that combines the use of magnetorheological (MR) dampers together with an earthquake early warning (EEW) system to minimize the losses in a structure about to be struck by an incoming ground motion. MR dampers can generate relatively large controllable damping forces by tuning the viscosity of an MR fluid through a control voltage. Their mechanical simplicity, fast response time, and low electric power requirements make them attractive for potential applications in earthquake engineering, particularly when combined with EEW. In this paper, a control algorithm is developed to determine the command voltage of the MR damper based on the expected ground shaking predicted by an EEW system. A general framework is introduced that develops a performance-based (i.e., loss-based) control algorithm for semi-active devices combined with an EEW system. A simplified story-based buildingspecific component-based loss estimation is used in the proposed framework, combining real-time, EEW-based seismic hazard, nonlinear dynamic structural simulation, damage fragility and loss. For illustrative purposes, the control algorithm is implemented on a generic three-story building structure equipped with a small-scale MR damper prototype. Results reveal that the developed EEW-based control algorithm can effectively reduce the expected loss of the considered case-study structure.

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