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dc.contributor.advisorAltıntaş, Ayhan
dc.contributor.authorÖzbey, Burak
dc.date.accessioned2016-07-11T13:33:39Z
dc.date.available2016-07-11T13:33:39Z
dc.date.copyright2016-06
dc.date.issued2016-06
dc.date.submitted2016-06-27
dc.identifier.urihttp://hdl.handle.net/11693/30118
dc.descriptionCataloged from PDF version of article.en_US
dc.descriptionThesis (Ph.D.): Bilkent University, Department of Electrical and Electronics Engineering, İhsan Doğramacı Bilkent University, 2016.en_US
dc.descriptionIncludes bibliographical references (leaves 128-140).en_US
dc.description.abstractStructural health monitoring (SHM) aims to ensure detection and prevention of damage in structures and protection of human life via observation of certain damage indicators. In SHM, one of the most important damage indicators is the strain forming on the steel reinforcing bars (rebars) embedded inside concrete. This strain can slowly develop over time, or can suddenly occur due to an overload such as an earthquake. In this dissertation, a novel wireless passive sensing system is presented for detecting and measuring the level of strain and relative displacement in structures. The sensing system comprises a nested split-ring resonator (NSRR) probe along with a transceiver antenna. These two elements form an electromagnetically coupled system that yields very high sensitivity and resolution of displacement and strain sensing accompanied with a wide dynamic range of measurement. Using this wireless system, it is possible to track strain/displacement in both the elastic (reversible-linear) and plastic (irreversiblenonlinear) deformation regions of steel rebars. In the dissertation, the results of the following experiments are presented: Characterization experiments carried out on a translation stage in laboratory environment, tensile test experiments where a rebar is loaded with a pulling force until fracture, and simply supported beam experiments where a beam undergoes loading, which leads to tensile strains on rebars at the bottom of the beam. Especially, the simply supported beam experiments constitute a decisive step toward a real-life application of the proposed sensing system. The sensing system is shown to acquire accurate data until the end of the measurements in which the wired devices such as strain gages break down and fail to capture. Furthermore, the eects of the complex electromagnetic medium formed by the rebars and the concrete on sensing are investigated. In addition, a multi-point sensing capability via multiple probes and single antenna is proposed and experimentally demonstrated, which can be used in 2-D surface strain mapping with further improvements. Finally, an equivalent circuit model is given for the NSRR structure, the results of which are compared to and found to be in good agreement with full-wave simulations and measurements. This study shows that the designed sensing system has the potential to be an alternative for both microstrain-level SHM and large displacement measurements, which can be useful for post-earthquake damage assessment.en_US
dc.description.statementofresponsibilityby Burak Özbey.en_US
dc.format.extentxxv, 140 leaves : charts.en_US
dc.language.isoEnglishen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectStructural health monitoringen_US
dc.subjectWireless passive sensorsen_US
dc.subjectDisplacement/ strain sensorsen_US
dc.subjectNested split ring resonatorsen_US
dc.subjectComplex electromagnetic mediumen_US
dc.subjectMulti-point sensingen_US
dc.subjectEquivalent circuit modelen_US
dc.titleDesign and implementation of a wireless passive sensing system for structural health monitoringen_US
dc.title.alternativeYapısal sağlık izleme için kablosuz pasif bir algılayıcı sistemin tasarlanması ve gerçekleştirilmesien_US
dc.typeThesisen_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.publisherBilkent Universityen_US
dc.description.degreePh.D.en_US
dc.identifier.itemidB153623


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