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On the robustness to corrosion in the life cycle assessment of an existing reinforced concrete bridge

Cavaco, Eduardo S.; Neves, Luis C.; Casas, Joan R.

Authors

Eduardo S. Cavaco

Luis C. Neves

Joan R. Casas



Abstract

Management of existing structures has traditionally been based on condition assessment, based on visual inspections, disregarding the susceptibility of different structural types to aging and deterioration. Robustness, as a measure of the effects of unpredictable damage to structural safety can be a complementary information to the results of inspection. Although robustness has mostly been used to evaluate the consequences of extreme events, a similar framework can be used to investigate the result of aging, allowing a better understanding of the potential effects of deterioration and allowing a better allocation of available maintenance funding. In this work, a probabilistic structural robustness indicator is used to quantify the susceptibility of structures to corrosion. The methodology is exemplified through a case study comprising an existing reinforced concrete bridge deck, heavily damaged due to reinforcement corrosion, and finally demolished due to safety concerns. Robustness measures the bridge deck safety tolerance to reinforcement corrosion. The principal effects of corrosion, including loss of area and bond between concrete and steel are modelled using a non-linear finite-element model, coupled with a Response Surface Method to compute the bridge reliability as a function of the corrosion level, and finally used to assess robustness. Results show that the redundancy of the bridge allows significant redistribution of loads between elements with different corrosion levels. As a result, the bridge presents significant robustness and tolerance to reinforcement corrosion.

Journal Article Type Article
Publication Date Jun 5, 2017
Journal Structure and Infrastructure Engineering
Print ISSN 1573-2479
Electronic ISSN 1744-8980
Publisher Taylor & Francis (Routledge)
Peer Reviewed Peer Reviewed
Volume 14
Issue 2
APA6 Citation Cavaco, E. S., Neves, L. C., & Casas, J. R. (2017). On the robustness to corrosion in the life cycle assessment of an existing reinforced concrete bridge. Structure and Infrastructure Engineering, 14(2), doi:10.1080/15732479.2017.1333128
DOI https://doi.org/10.1080/15732479.2017.1333128
Keywords Robustness, corrosion, reinforced concrete, reliability, bridge, tolerance
Publisher URL http://www.tandfonline.com/doi/abs/10.1080/15732479.2017.1333128?journalCode=nsie20
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information This is an Accepted Manuscript of an article published by Taylor & Francis in Structure and Infrastructure Engineering on 05/06/2017, available online: http://www.tandfonline..../15732479.2017.1333128.

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf



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