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dc.contributor.authorYasuda, Naotoshien
dc.contributor.authorMisaki, Norikazuen
dc.contributor.authorShimada, Yoshinorien
dc.contributor.authorYamaoka, Daikien
dc.contributor.alternative保田, 尚俊ja
dc.description.abstractThis paper proposes a method for detection and estimation of the characteristics of defects in concrete structures using laser ablation-induced vibration for non-contact structural inspection to prevent partial spalling. Two types of lasers are used: the first is an impact laser that is used to induce vibrations in the measurement target and the second is a detection laser that is used to measure these induced vibrations. Laboratory tests are performed using concrete specimens with and without an internal defect. The results show that the presence of a defect can be estimated from the occurrence of damped oscillations in the measurement data. The presence or absence of these damped oscillations can be determined using the least-squares complex frequency-domain (LSCF) method, which is a fast-stabilizing parameter estimation method for modal identification problems. Additionally, when a defect is present, the defect vibration characteristics, such as natural frequencies and damping ratios, can be estimated. In particular, the natural frequencies can be estimated accurately.en
dc.publisherElsevier BVen
dc.rights© 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
dc.rightsThe full-text file will be made open to the public on 1 September 2022 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.en
dc.rightsThis is not the published version. Please cite only the published version.en
dc.subjectInspection methoden
dc.subjectLaser ablationen
dc.subjectModal identificationen
dc.titleDetection and characteristics estimation of defects in concrete structures using laser ablation-induced vibrationen
dc.typejournal article-
dc.type.niitypeJournal Article-
dc.identifier.jtitleTunnelling and Underground Space Technologyen
dc.addressDepartment of Civil and Earth Resources Engineering, Kyoto Universityen
dc.addressWest Japan Railway Companyen
dc.addressInstitute for Laser Technology, Osakaen
dc.addressDepartment of Civil and Earth Resources Engineering, Kyoto Universityen
dcterms.accessRightsembargoed access-
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