Abstract
RETRO’ project aims at studying the seismic behaviour of existing reinforced concrete (RC) bridges and the effectiveness of retrofitting systems based on seismic isolation of the deck of the viaduct. The research program focuses on a typical non-compliant bridge system for earthquake loading, designed for gravity loads only. The prototype structure is the Rio Torto bridge system, which is located in a region of medium seismic hazard in Italy. The seismic vulnerability of the as-built framed pier bridge is first assessed. A typical seismic isolation system, employing slide spherical bearings, is then designed as a passive control retrofitting measure. The present chapter discusses the non-linear response of the Rio-Torto viaduct in the “as-built” and “isolated” configurations. The seismic performance assessment is carried out by utilizing refined non-linear structural models implemented in an advanced and reliable computer platform. The earthquake behaviour of refined models used for the sample structure accounts for non-linear phenomena of the viaduct, e.g. strain penetration of plain bars, shear deformation of transverse beams, flexural deformations in columns and beams. The finite element models are calibrated on the basis of experimental tests results. The assessment of the seismic response system is investigated in terms of local and global response parameters. In addition, the effectiveness of the isolation systems used as a retrofitting system is also investigated numerically. The outcomes of the comprehensive nonlinear analyses are used to simulate the seismic response of the viaduct in the as-built and isolated configurations during Pseudo-dynamic testing, which is illustrated in a companion chapter.
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Acknowledgements
The research leading to these results has received funding from the European Community’s Seventh Framework Programme [FP7/2007–2013] for access to the EUROPEAN LABORATORY FOR STRUCTURAL ASSESSMENT of the EUROPEAN COMMISSION—JOINT RESEARCH CENTRE under grant agreement n° 227887. Opinions, findings and conclusions expressed in this paper are those of the authors and do not necessarily reflect those of SERIES.
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Paolacci, F. et al. (2015). Refined and Simplified Numerical Models of an Isolated Old Highway Bridge for PsD Testing. In: Taucer, F., Apostolska, R. (eds) Experimental Research in Earthquake Engineering. Geotechnical, Geological and Earthquake Engineering, vol 35. Springer, Cham. https://doi.org/10.1007/978-3-319-10136-1_13
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