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Deck and cable dynamic testing of a single-span bridge using radar interferometry and videometry measurements / George Piniotis in Journal of applied geodesy, vol 10 n° 1 (March 2016)  

Public [article]  inJournal of applied geodesy > vol 10 n° 1 (March 2016) . - pp 87 - 94 Titre : Deck and cable dynamic testing of a single-span bridge using radar interferometry and videometry measurements Type de document : Article/Communication Auteurs : George Piniotis, Auteur ; Vassilis Gikas, Auteur ; Thanassis Mpimis, Auteur ; Harris Perakis, Auteur Année de publication : 2016 Article en page(s) : pp 87 - 94 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Topographie [Termes IGN] appariement d'images [Termes IGN] auscultation d'ouvrage [Termes IGN] interféromètrie par radar à antenne synthétique [Termes IGN] pont [Termes IGN] séquence d'images [Termes IGN] vibration [Termes IGN] vidéo numérique Résumé : (auteur) This paper presents the dynamic testing of a roadway, single-span, cable-stayed bridge for a sequence of static load and ambient vibration monitoring scenarios. Deck movements were captured along both sideways of the bridge using a Digital Image Correlation (DIC) and a Ground-based Microwave Interfererometer (GBMI) system. Cable vibrations were measured at a single point location on each of the six cables using the GBMI technique. Dynamic testing involves three types of analyses; firstly, vibration analysis and modal parameter estimation (i. e., natural frequencies and modal shapes) of the deck using the combined DIC and GBMI measurements. Secondly, dynamic testing of the cables is performed through vibration analysis and experimental computation of their tension forces. Thirdly, the mechanism of cable-deck dynamic interaction is studied through their Power Spectra Density (PSD) and the Short Time Fourier Transform (STFT) analyses. Thereby, the global (deck and cable) and local (either deck or cable) bridge modes are identified, serving a concrete benchmark of the current state of the bridge for studying the evolution of its structural performance in the future. The level of synergy and complementarity between the GBMI and DIC techniques for bridge monitoring is also examined and assessed. Numéro de notice : A2016-556 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article DOI : 10.1515/jag-2015-0030 En ligne : http://dx.doi.org/10.1515/jag-2015-0030 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81711 [article]

Structural integrity verification of cable stayed footbridge based on FEM analyses and geodetic surveying techniques / Vassilis Gikas in Survey review, vol 48 n° 346 (January 2016)  

Public [article]  inSurvey review > vol 48 n° 346 (January 2016) . - pp 1 - 10 Titre : Structural integrity verification of cable stayed footbridge based on FEM analyses and geodetic surveying techniques Type de document : Article/Communication Auteurs : Vassilis Gikas, Auteur ; P. Karydakis, Auteur ; Thanassis Mpimis, Auteur ; et al., Auteur Année de publication : 2016 Article en page(s) : pp 1 - 10 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Topographie [Termes IGN] construction [Termes IGN] GPS-INS [Termes IGN] modèle mathématique [Termes IGN] pont [Termes IGN] surveillance d'ouvrage Résumé : (auteur) This paper presents the mathematical models developed for the design of a pedestrian, cable stayed bridge, the geodetic monitoring procedures and their detailed cross-comparisons and analyses undertaken during the phases of construction and at commissioning stage. Because of the asymmetric design, the relative flexibility of the pylons, the eccentric positioning of the central joint and the off-plane low angles of the cables, a multi-sensor, event based geodetic monitoring scheme was adopted to assess the structural integrity of the bridge. During construction, the bridge kinematics were measured along both sides of the deck and at selected points on the pylon facades using a digital level and a high accuracy total station used in metrology respectively. At a commissioning stage, a number of load test series were undertaken using conventional geodetic techniques and a tactical grade Inertial Measurement Unit (IMU). Analysis confirmed the overall mathematical modelling assumptions made for the individual stages of construction and for the completed structure. However, analysis also revealed the increased structural rigidity of the structure. This particularly applies for the torsional stiffness of the deck that exhibits low (by a factor of 0·5) rotation angles compared to those obtained from the analytical models. Numéro de notice : A2016-043 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1080/00396265.2015.1097582 En ligne : https://doi.org/10.1080/00396265.2015.1097582 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79636 [article]