RETRO’ project aims at studying the seismic behaviour of existing reinforced concrete (RC) bridges and the effectiveness of retrofitting systems employing the seismic isolation of the deck of the viaduct. The research program focuses on a typical non-compliant bridge system, which designed for gravity loads only. The sample structure is Rio Torto bridge system, which is located in a region with 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 “as-built” and “isolated” configurations. The seismic performance assessment is carried out by utilizing refined non-linear structural models implemented in an ad-vanced and reliable computer platform. The earthquake behaviour of refined mod-els used for the sample structure accounts for the non-linear phenomena of the vi-aduct, e.g. strain penetration of plain bars, shear deformation of transverse beams, flexural deformations in columns and beams. The finite element models are cali-brated on the basis of experimental tests results. The assessment of the seismic re-sponse 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 anal-yses are used to simulate the seismic response of the viaduct in the as-built and isolated configurations for the Pseudo-dynamic testing, which is illustrated in a companion chapter.
Paolacci, F., Sarno, L., De Risi, R., Abbiati, G., Mohamad, A., Malena, M., et al. (2015). Refined and simplified numerical models of an isolated old highway bridge for PsD testing. In SERIES Concluding Workshop – Joint with US-NEES, “Earthquake Engineering Research Infrastructures”,JRC-Ispra, May 28-30, 2013, In Memory of Prof. Roy Severn (pp. 73-98). Springer International Publishing Switzerland [10.1007/978-3-319-10136-1_13].
Refined and simplified numerical models of an isolated old highway bridge for PsD testing
PAOLACCI, Fabrizio;Malena M;
2015-01-01
Abstract
RETRO’ project aims at studying the seismic behaviour of existing reinforced concrete (RC) bridges and the effectiveness of retrofitting systems employing the seismic isolation of the deck of the viaduct. The research program focuses on a typical non-compliant bridge system, which designed for gravity loads only. The sample structure is Rio Torto bridge system, which is located in a region with 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 “as-built” and “isolated” configurations. The seismic performance assessment is carried out by utilizing refined non-linear structural models implemented in an ad-vanced and reliable computer platform. The earthquake behaviour of refined mod-els used for the sample structure accounts for the non-linear phenomena of the vi-aduct, e.g. strain penetration of plain bars, shear deformation of transverse beams, flexural deformations in columns and beams. The finite element models are cali-brated on the basis of experimental tests results. The assessment of the seismic re-sponse 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 anal-yses are used to simulate the seismic response of the viaduct in the as-built and isolated configurations for the Pseudo-dynamic testing, which is illustrated in a companion chapter.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
