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Implementation of GPR and TLS data for the assessment of the bridge slab geometry and reinforcement

Cafiso S., Di Graziano A., Goulias D., Mangiameli M., Mussumeci G.

Archives of Civil Engineering

2020

Vol. 66, nr 1

297--308

This paper presents a suggested approach for forensic investigation of bridge decks in which Ground penetrating radar (GPR) consisting of two antennas is used to assess the current conditions. The methodology was tested on a bridge deck in central Sicily. The acquired data were analyzed for identifying the asphalt overlay thickness, concrete cover depth and deck thickness and location of the rebar reinforcement. In the proposed approach for assessing bridge deck conditions the GPR survey was complemented with (i) a site investigation on layer thicknesses for calibration/verification purposes of the GPR response and (ii) a Terrestrial Laser Scanning system (TLS) to verify the bridge design slab curvature. The study shows that this methodology has significant merits on accurately assessing such bridge deck components when bridge design records are non-existing, and by using non-invasive methods such as laser scanning and GPR. The great advantage provided by the TLS technique is the possibility to obtain a 3D output model of the scanned element with the accuracy of the best topographic instruments in order to complement GPR data surveys for bridge inspection.

GPS/EGNOS positioning of archeological site in Pompeii

Manzoni G., Inchingolo D., Manzoni M., Martinolli S., Oriolo F., Oszczak S., Ciecko A., Oszczak B., Sanna G. M., Dessi A., Pusceddu L., Crocetto N., Ponte S., Crisci M., Caroti G., Bedini A., Micheloni J., Tronconi M., Mussumeci G., Lombardo C., Guarnieri A., Pontin M., Migliore A., Silvestre G.

Reports on Geodesy

2004

nr 2/69

335--340

The paper presents the results of GPS and EGNOS satellite experiments performed in Pompeia's archeological site. The main goals of the experiments were as follows: 1. Establishment of GPS control point network on the streets of this ancient city, 2. Examination of GPS/RTK OTF method with different types of receivers and teletransmission lines, 3. Examination of EGNOS (ESTB) performance and positioning accuracy. The experiments were conducted jointly by the teams of Italian Universities in: Trieste, Napoli Seconda, Salerno, Catania, Cagliari, Pisa and Padova and the team of the Chair of Satellite Geodesy and Navigation of the University of Warmia and Mazury in Olsztyn, Poland in July 2003 and thanks to the very kind and valuable help ofPompei's Sopraintendenza Archeologica. Different receivers were taking part in the experiments including Ashtech, Javad, Leica, Tumble, Garmin and Magellan receivers. The results of EGNOS (ESTB) satellite positioning are compared with performance of precise RTK OTF method. Estimation of accuracy of ESTB satellite positioning is done. The results are presented and discussed.