THE EFFECTS OF UNMITIGATED IDLE TIME ON THE PERFORMANCE OF MAGNETORHEOLOGICAL DAMPERS AS A STRUCTURAL PROTECTIVE SYSTEM.

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dc.contributor.advisorPhillips, Brianen_US
dc.contributor.authorKhan, Sami Ur-Rahmanen_US
dc.contributor.departmentCivil Engineeringen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2018-07-17T06:33:27Z
dc.date.available2018-07-17T06:33:27Z
dc.date.issued2018en_US
dc.description.abstractThis thesis discusses the long-term performance degradation of seismic protective systems due to age and inactivity (termed “idle time effects”). Over the lifetime of a structures there is the potential for a significant reduction in ability for the structural control systems to mitigate earthquakes. This can affect the resilience of the structure and lead to uncertainty in engineering judgement when designing seismic protective systems. Further research into these idle time effects could help to create solutions to mitigate age-dependent performance loss. This paper will use magneto-rheological (MR) dampers, which serve as a good analog for other semi-active control devices, to study idle time effects on seismic protection. MR dampers provide controllable damping through the magnetization of small MR particles in a carrier fluid. These particles can settle over time, influencing their performance. Using a model MR fluid, accelerated testing was performed to analyze the consequences of idle time.en_US
dc.identifierhttps://doi.org/10.13016/M2SB3X25V
dc.identifier.urihttp://hdl.handle.net/1903/21076
dc.language.isoenen_US
dc.subject.pqcontrolledCivil engineeringen_US
dc.subject.pquncontrolledCivilen_US
dc.subject.pquncontrolledDampingen_US
dc.subject.pquncontrolledEarthquakeen_US
dc.subject.pquncontrolledMagnetorheologicalen_US
dc.subject.pquncontrolledSeismicen_US
dc.subject.pquncontrolledStructuresen_US
dc.titleTHE EFFECTS OF UNMITIGATED IDLE TIME ON THE PERFORMANCE OF MAGNETORHEOLOGICAL DAMPERS AS A STRUCTURAL PROTECTIVE SYSTEM.en_US
dc.typeThesisen_US

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