PSI - Issue 44

Gianfranco De Matteis et al. / Procedia Structural Integrity 44 (2023) 681–688 Gianfranco De Matteis et al. / Structural Integrity Procedia 00 (2022) 000–000

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Fig. 4. (a) Combination load multiplier-displacement curve and (b), (c) concrete tensile plastic strains and steel equivalent (Von Mises) plastic strains, respectively, obtained at the end of the analysis.

modelling) linear analysis, as well as nonlinear analysis. The results show that 3D models based on beams elements for modelling the slab are able to provide results very similar to more demanding 3D model based on solid elements. Conversely, conventional 1D model for the slab are much more conservative in the results. The full NLA, which compared to linear methods is potentially able to fully exploit the stress redistribution after yielding, confirmed the safety of the slab for the considered load combination at ultimate limit state, even though highlighted possible issues in the longitudinal beams. Further developments will focus on the definition of a comprehensive set of benchmark tests and acceptance criteria for the most widespread nonlinear modelling strategies for RC bridges, as well as application of the approach to a larger number of case studies in order to provide useful guidelines to practitioners and authorities involved in bridge management. References EN 1992-2, 2004. Eurocode 2: Design of concrete structures - Part 1-1: General rules and rules for buildings. European Standard. EN 1992-2, 2006. Eurocode 2: Design of concrete structures - Part 2: Concrete bridges - Design and detailing rules. European Standard. Engen, M., Hendriks, M. A. N., Monti, G. & Allaix, D. L., 2021. Treatment of modelling uncertainty of NLFEA in fib Model Code 2020. Structural Concrete 22, 3202– 3212. Engen, M. Hendriks, M. A.N., Köhler, J., Øverli, J. A., Åldstedtal., E., 2017. A quantification of the modelling uncertainty of non-linear finite element analyses of large concrete structures. Structural Safety 64, 1-8. fib, 2008. Bulletin No. 45: Practitioners' guide to finite element modelling of reinforced concrete structures, Lausanne: The International Federation for Structural Concrete. fib, 2012. Model Code 2010 - Final draft. fib 65. International Federation for Structural Concrete. Hendriks, M., Boer, A. d., Belletti, B., 2017. Guidelines for Nonlinear Finite Element Analysis of Concrete Structures, Rijkswaterstaat Centre for Infrastructure. JCSS, 2001. Probabilistic Model Code, 12th draft, Joint Committee on Structural Safety. Karayannis, C. G., Chalioris, C. E., 2013. Shear tests of reinforced concrete beams with continuous rectangular spiral reinforcement. Construction and Building Materials 46, 86-97. Mathey, R., Watstein, D., 1960. Effect of Tensile Properties of Reinforcement on the Flexural Characteristics of Beams. Journal of the American Concrete Institute, Proceedings 56(12), 1253-1273. MIT, 2020. Linee guida per la classificazione e gestione del rischio, la valutazione della sicurezza ed il monitoraggio dei ponti esistenti. Roma: Parere del Consiglio Superiore dei Lavori Pubblici n.88/2019. MIT, 2018. Norme Tecniche per le Costruzioni - Decreto Ministeriale 17 Gennaio 2018. Rome: Ministero delle Infrastrutture e dei Trasporti. Tur, V., Derechennik, S., Tur, A., 2020. Safety Formats for Non-Linear Analysis: Are the Current Structural Codes Applicable for Practice? Solid State Phenomena, Volume 309, pp. 193-200. Castaldo, P., Gino, F., Mancini, G., 2019. Safety formats for non-linear analysis of reinforced concrete structures: discussion, comparison and proposal. Engineering Structures 193, 136-153. Cervenka, V., 2008. Global safety format for nonlinear calculation of reinforced concrete. Beton-und Stahlbetonbau 103(S1), 37-42. D'Amato, M., De Matteis, G., 2022. Application of a Simplified Load Rating Method for Scoring Existing Bridges: A Territorial Case Study in Basilicata.. Lecture Notes in Civil Engineering, 428-36.