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Giannico C.,TRE Tele Rilevamento Europa | Ferretti A.,TRE Tele Rilevamento Europa | Jurina L.,Polytechnic of Milan | Ricci M.,Italferr Direzione Tecnica
Life-Cycle and Sustainability of Civil Infrastructure Systems - Proceedings of the 3rd International Symposium on Life-Cycle Civil Engineering, IALCCE 2012 | Year: 2012

Remote sensing techniques have been widely used in recent decades to monitor earth surface displacements. SqueeSAR" SAR interferometry is today one of the most advanced technologies for surface deformation monitoring. It exploits long temporal series of satellite radar data, acquired over the same area of interest at different times, to identify "natural radar targets" where very precise displacement information can be retrieved. Selected case studies will be presented, demonstrating how satellite radar data can provide useful information during the various stages of infrastructure construction, from design to building and management. Applications carried out in urban contexts demonstrated that satellite interferometry is not only suitable for monitoring slow and constant-velocity movements, but can successfully work even in case of abrupt changes and significant variations in displacement rate through time. In about ten years from its development, this technology has become a standard monitoring tool used as an integration with ground based monitoring techniques.

Del Principe B.,University of Naples Federico II | Di Sarno L.,University of Sannio | Evangelista L.,Italferr Direzione Tecnica | Cosenza E.,University of Naples Federico II
Advances and Trends in Structural Engineering, Mechanics and Computation - Proceedings of the 4th International Conference on Structural Engineering, Mechanics and Computation, SEMC 2010 | Year: 2010

The present paper focuses on the response analysis of an existing railway viaduct.The viaductwas retrofitted with innovative technologies, employing either high damping rubber bearings or hysteretic dampers. Refined linear and non linear finite element modelswere implemented and utilized to performmodal and dynamic analyses under earthquake ground motions. The effects of soil-structure interaction were also accounted for. The results of the analyses carried out on two models are presented hereafter: the viaductwas initially retrofitted through the use of high-damping rubber bearings with lead core; subsequently, the structure was equipped with hysteretic dampers. The outcomes of the performed analyses show that the use of base isolation systems is extremely effective for the design of a number of structural elements in railway bridges, e.g. foundations and deck supports. The present numerical study demonstrates, however, that the base isolation technology is highly cost-efficient for highway bridges, provided that the devices allow the performance of the bridge under non seismic service conditions. © 2010 Taylor & Francis Group, London.

The compensation grouting technique was applied to design two parallel tunnels, constructed with Earth Pressure Balance Shield (EPBS)-technology mechanized boring for the new high speed and high capacity railway lines of Milan-Naples and Turin-Milan in Italy. The two parallel tunnels passed beneath the bridge with a cover of about 10 meters from the foundations, allowing to predict settlements of about 20 mm and potentially up to 50 mm. Construction works were farmed out according to the Merloni law, while design and works supervision were assigned to Italferr on behalf of TAV. Specific analyses were carried out to evaluate the sensitivity of the bridge structure to an induced subsidence field. A non linear calculation FEM model of the work was implemented to investigate the real structural response of the masonry work. The compensation grouting technology also involved injecting a concrete mix in the ground between the tunnel vault and the foundation level of the structure to protect.

Evangelista L.,Italferr Direzione Tecnica | Martino A.,Italferr Direzione Tecnica | Vittozzi A.,Italferr Direzione Tecnica | Mencaccini V.,Italferr Direzione Tecnica
Ingegneria Ferroviaria | Year: 2011

The start of the operation on the new railway bridge of Ostiglia (MN) crossing the river Po along the railway line Bologna-Verona, allowed Italferr, the engineering company of Ferrovie dello Stato, to carry out some experimental tests aiming to verify the advantages of the new construction typology in the field of the sound emissions generated by the passage of the trains. This bridge is composed of simply supported single-track metallic lattice girders (through arch upper-closure girders), with theoretical spacing between supports of 64.4 m and 73.6 m. It is a ballasted-permanent way bridge and its deck is composed of a reinforced mix continuous slab. The monitored structural solution shows different innovative characteristics if compared with the traditional metallic lattice girders with non ballasted-permanent way; one of these characteristics is a significant noise reduction. This paper summarizes the most important aspects of the considered test campaign with a particular attention to comparisons between the sound emissions of the new bridge crossing the river Po along the line BO-VR and the corresponding emissions relevant to other non ballastedpermanent way bridges. Further comparisons with other structure typologies along the same line, such as embankments and pre-compressed reinforced concrete decks, were carried out too.

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