Assessment of the Seismic Behaviour of a Retrofitted Old R.C. Highway Bridge Through PsD Testing

Paolacci, Fabrizio; Sarno, Luigi Di; Pegon, P.; Molina, J.M.; Poljanšek, Martin; Bursi, Oreste S.; Abbiati, Giuseppe; Ceravolo, Rosario; Erdik, Mustafa; Risi, Raffaele De; Mohamad, Arkam Mohammad Zeki

doi:10.1007/978-3-319-10136-1_14

Cited by 4 publications

(7 citation statements)

References 14 publications

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“…Identified values of Eq. read as follows:

\overset{k}{true} = 2.03 normale 8

N/m,

\overset{α}{true} = 0.46 normale - 2

, and

\overset{δ}{true} = 0.05 normale - 2

m . Although the effect of variable vertical loads was neglected in the NSs, simplified bilinear hysteretic models well reproduced the response of all OpenSEES isolators.…”

Section: Substructuring and Reduced Models Of The Rio Torto Viaductmentioning

confidence: 98%

“…In detail for the as built configuration, Piers #9 and #11 were experimentally substructured. They represented the shortest of the solid and hollow section columns, respectively; moreover, they were significantly stressed piers, as suggested by numerical simulations . The same specimens together with related pairs of CSB devices were tested for the isolated case at the ELSA Lab.…”

Section: Hybrid Simulation Framework For the Rio Torto Viaductmentioning

confidence: 99%

“…Because reduced nonlinear springs were not capable of reproducing pier behavior at their full operating range, a set of parameters was identified for each different limit state. Identified values can be found in . Figure depicts comparisons between displacement responses of OpenSEES RMs and reduced models of Piers #9 and #11 at ULS.…”

Section: Substructuring and Reduced Models Of The Rio Torto Viaductmentioning

confidence: 99%

“…Though the aforementioned research advanced the testing and assessment of multi‐pier bridges, there are still issues related to the following: (i) in‐depth understanding of old RC bridge behavior when not designed to resist seismic action; (ii) the presence of plain steel bars for which few studies have been carried out; and (iii) the effectiveness of isolation retrofit systems. These issues were explored by the RETRO project , and the main findings are reported in the following.…”

Section: Introductionmentioning

confidence: 99%

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Hybrid simulation of a multi‐span RC viaduct with plain bars and sliding bearings

Abbiati

Bursi

Philippe

et al. 2015

Earthq Engng Struct Dyn

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Summary This paper deals with the seismic response assessment of an old reinforced concrete viaduct and the effectiveness of friction‐based retrofitting systems. Emphasis was laid on an old bridge, not properly designed to resist seismic action, consisting of 12 portal piers that support a 13‐span bay deck for each independent roadway. On the basis of an OpenSEES finite element frame pier model, calibrated in a previous experimental campaign with cyclic displacement on three 1:4 scale frame piers, a more complex experimental activity using hybrid simulation has been devised. The aim of the simulation was twofold: (i) to increase knowledge of non‐linear behavior of reinforced concrete frame piers with plain steel rebars and detailing dating from the late 1950s; and (ii) to study the effectiveness of sliding bearings for seismic response mitigation. Hence, to explore the performance of the as built bridge layout and also of the viaduct retrofitted with friction‐based devices, at both serviceability and ultimate limit state conditions, hybrid simulation tests were carried out. In particular, two frame piers were experimentally controlled with eight‐actuator channels in the as built case while two frame piers and eight sliding bearings were controlled with 18‐actuator channels in the isolated case. The remaining frame piers were part of numerical substructures and were updated offline to accurately track damage evolution. Copyright © 2015 John Wiley & Sons, Ltd.

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“…Identified values of Eq. read as follows:

\overset{k}{true} = 2.03 normale 8

N/m,

\overset{α}{true} = 0.46 normale - 2

, and

\overset{δ}{true} = 0.05 normale - 2

m . Although the effect of variable vertical loads was neglected in the NSs, simplified bilinear hysteretic models well reproduced the response of all OpenSEES isolators.…”

Section: Substructuring and Reduced Models Of The Rio Torto Viaductmentioning

confidence: 98%

Section: Hybrid Simulation Framework For the Rio Torto Viaductmentioning

confidence: 99%

Section: Substructuring and Reduced Models Of The Rio Torto Viaductmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hybrid simulation of a multi‐span RC viaduct with plain bars and sliding bearings

Abbiati

Bursi

Philippe

et al. 2015

Earthq Engng Struct Dyn

Self Cite

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show abstract

“…The framework is applied to a real‐world application consisting of a Reinforced Concrete (RC) bridge case study, which was recently tested within the RETRO project. [ 17,18 ] LF and HF simulators are introduced, highlighting the crucial role of HS in enabling experimental validation of the bridge model. [ 19 ] Since the selected case study structure is insensitive to broadband ground motions, the artificial ground motion model incorporates a pulse‐like component, [ 20 ] and it is calibrated against a set hazard‐consistent site‐specific real records.…”

Section: Introductionmentioning

confidence: 99%

Seismic fragility analysis based on artificial ground motions and surrogate modeling of validated structural simulators

Abbiati

Broccardo

Abdallah

et al. 2021

Earthq Engng Struct Dyn

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This study introduces a computational framework for efficient and accurate seismic fragility analysis based on a combination of artificial ground motion modeling, polynomial-chaos-based global sensitivity analysis, and hierarchical kriging surrogate modeling. The framework follows the philosophy of the Performance-Based Earthquake Engineering PEER approach, where the fragility analysis is decoupled from hazard analysis. This study addresses three criticalities that are present in the current practice. Namely, reduced size of hazardconsistent size-specific ensembles of seismic records, validation of structural simulators against large-scale experiments, high computational cost for accurate fragility estimates. The effectiveness of the proposed framework is demonstrated for the Rio Torto Bridge, recently tested using hybrid simulation within the RETRO project.

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Refined and Simplified Numerical Models of an Isolated Old Highway Bridge for PsD Testing

Paolacci

Sarno

Risi

et al. 2015

Experimental Research in Earthquake Engineering

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Assessment of the Seismic Behaviour of a Retrofitted Old R.C. Highway Bridge Through PsD Testing

Cited by 4 publications

References 14 publications

Hybrid simulation of a multi‐span RC viaduct with plain bars and sliding bearings

Hybrid simulation of a multi‐span RC viaduct with plain bars and sliding bearings

Seismic fragility analysis based on artificial ground motions and surrogate modeling of validated structural simulators

Refined and Simplified Numerical Models of an Isolated Old Highway Bridge for PsD Testing

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