Abstract
Thousands of masonry arch bridges currently in service in the Italian railway network were built almost 100 years ago. Despite having often been constructed without any specific seismic design, in general these structures exhibited in the past a non-negligible resilience to seismic shocks, even when located in areas with medium/high seismic hazard.
Reliable methods are thus required for simplified seismic vulnerability assessment of such a number of structures, in order to ascertain whether more detailed analyses are needed and/or to provide information for a preliminary prioritization of interventions. In this work, the seismic capacity of single and multi-span masonry arch bridges is assessed by non-linear kinematic limit analysis. To this purpose, both “local” and “global” collapse mechanisms are identified - involving piers, abutments, arches and spandrel walls - considering both the longitudinal and the transverse direction of the bridges. For each mechanism, capacity curves are evaluated, in terms of horizontal acceleration versus displacement of a proper control point. Safety checks are hence performed comparing displacement capacity and demand at different performance limits.
These criteria provide the parameters needed for the derivation of fragility curves that can be applied for the definition of a large-scale damage scenario after a seismic event and as a support tool for the prioritization of the possible interventions. The so derived fragility curves could be related to the study of a single bridge (with uncertainties on dimensional and mechanical properties) or of a homogeneous typology of bridge (taxonomy). The paper reports some examples of application to both such cases.
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Acknowledgements
This study was developed within a project between the EUCENTRE Foundation and the Italian Railway Network (RFI). The authors would like to acknowledge Mauro Onida for his contribution in the evaluation of the statistical data related to the masonry arch bridges in the Italian railway network. Special thanks to Davide Quaroni who implemented the calculation engine of the fragility curves in a web APP that technologically transferred the result of this research into an industrial framework.
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Manzini, C.F. et al. (2022). Derivation of Fragility Curves for the Seismic Vulnerability Assessment of Railway Masonry Arch Bridges. In: Pellegrino, C., Faleschini, F., Zanini, M.A., Matos, J.C., Casas, J.R., Strauss, A. (eds) Proceedings of the 1st Conference of the European Association on Quality Control of Bridges and Structures. EUROSTRUCT 2021. Lecture Notes in Civil Engineering, vol 200. Springer, Cham. https://doi.org/10.1007/978-3-030-91877-4_102
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