000021840 001__ 21840
000021840 005__ 20170622131307.0
000021840 04107 $$aeng
000021840 046__ $$k2017-06-15
000021840 100__ $$aRoselli, Ivan
000021840 24500 $$aPROCESSING OF 3D OPTICAL MOTION DATA OF SHAKING TABLE TESTS: FILTERING OPTIMIZATION AND MODAL ANALYSIS

000021840 24630 $$n6.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000021840 260__ $$bNational Technical University of Athens, 2017
000021840 506__ $$arestricted
000021840 520__ $$2eng$$aThe use of 3D optical motion data for structural dynamics is both promising and challenging. Further developments for on-the-filed applications are still needed, but, at the present stage, such techniques are already feasible for laboratory dynamic tests. A measurement system of this kind was installed for the first time for shaking table testing at the ENEA Casaccia Research Center. This 3D motion capture system is capable of acquiring the positions of more than a hundred passive markers with a constellation of 10 near-infrared cameras. In particular, this paper focuses on filtering and processing the markers displacements. A methodology is proposed for optimizing the displacement data processing to obtain an estimation of markers accelerations. Such methodology implies the optimal choice of the Savitzky-Golay-filter parameters for the implementation of a filtered numerical derivative of displacement data. The optimal parameters are calculated minimizing the error in the estimation of the peak acceleration of a reference marker compared to a conventional accelerometer located at the same measurement point. The accuracy of markers accelerations was estimated in the range of 0.01-0.02 g, which is appropriate for providing interesting indications for studied structures subjected to most shaking table testing. For example, markers displacements data and related estimated accelerations can be combined to obtain the hysteretic behavior of the structure or of portions of it. Markers data were also used for Experimental and Operational Modal Analysis (EMA/OMA) in order to extract the modal parameters and to calibrate/validate the Finite Element Models (FEM) of the structure. In particular, the combined used of OMA by markers data and numerical modal analysis by FEM permits to compare the resulting modal shapes for a more precise dynamic identification. An example of practical application is illustrated on a shaking table experimentation conducted on a twostory tuff-masonry prototype, which reproduces a typical ancient buildings of Central Italy.

000021840 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000021840 653__ $$a3D Motion Capture, Shaking Table, Displacement Signal Filtering, Modal Analysis.

000021840 7112_ $$aCOMPDYN 2017 - 6th International Thematic Conference$$cRhodes Island (GR)$$d2017-06-15 / 2017-06-17$$gCOMPDYN2017
000021840 720__ $$aRoselli, Ivan$$iFelice, Gianmarco De$$iCanio, Gerardo De$$iMongelli, Marialuisa$$iPaolini, Daniela
000021840 8560_ $$ffischerc@itam.cas.cz
000021840 8564_ $$s435886$$uhttps://invenio.itam.cas.cz/record/21840/files/18115.pdf$$yOriginal version of the author's contribution as presented on CD, section: [RS15] Performance-based earthquake engineering
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000021840 962__ $$r21500
000021840 980__ $$aPAPER