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dc.contributor.authorLantz, Gabriel Antoineen_US
dc.date.accessioned2013-01-17T21:00:27Z
dc.date.available2013-01-17T21:00:27Z
dc.date.issued2011-08-29en_US
dc.identifier.urihttp://hdl.handle.net/1853/45773
dc.description.abstractNearly one third of the 604,426 bridges in the United-States are either structurally deficient or functionally obsolete. Monitoring these bridges is essential to avoid catastrophic accidents. In steel bridges fatigue induced crack/rupture, which is one of the most common modes of failure, can be avoided if the crack is detected at the early stages of its formation. Cracks usually originate at stress concentration areas but their precise origin is random. Such strain concentration can be monitored with traditional strain gages, but their installation requires lengthy wires and equipment, which are expensive and labor intensive. Therefore wireless sensors are being developed to cope with these problems. In this work, a passive wireless strain sensor based on RFID technology is described. The sensor is a patch antenna that resonates at a certain frequency, which shifts in presence of strain. The relation between the resonance frequency and the strain is approximately linear. The slope of the relation is called sensitivity. The behavior of the sensor's sensitivity is studied using experimental work and simulations that couple electromagnetism and mechanics. The sensitivity measured in experiments and in simulations in presence of uniform strain is different. This difference is lower for the sensitivity in presence of a crack, probably due to a parameter variation that is currently not accurately modeled in the simulations.en_US
dc.publisherGeorgia Institute of Technologyen_US
dc.subjectSensoren_US
dc.subjectRFIDen_US
dc.subjectStrainen_US
dc.subjectStructureen_US
dc.subject.lcshStrains and stresses
dc.subject.lcshStructural analysis (Engineering)
dc.subject.lcshStructural health monitoring
dc.subject.lcshRadio frequency identification systems
dc.titleCrack detection using a passive wireless strain sensoren_US
dc.typeThesisen_US
dc.description.degreeMSen_US
dc.contributor.departmentCivil and Environmental Engineeringen_US
dc.description.advisorCommittee Chair: Dr. Yang Wang; Committee Co-Chair: Dr. Roberto T. Leon; Committee Member: Dr. Manos M. Tentzerisen_US


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