Abstract
Fibre Reinforced Concrete (FRC) has been increasingly used in precast tunnel linings. FRC, with or without conventional reinforcement could be an adequate solution for fulfilling the structural requirements. The design process of segmental concrete linings in ground conditions generally refers to the final permanent embedded in ground condition as well as to temporary phases. Among these temporary phases, the TBM thrust jack phase is a crucial loading condition during construction, which may noticeably govern the segment design. Tunnel elements having an internal diameter of 3.50 m and a thickness of 0.20 m were studied through full-scale tests to shed new lights on the possible use of macro-synthetic fibres in segmental lining. Precast segments were tested under bending in order to reproduce typical flexural conditions occurring during de-moulding, storage and transportation. Moreover, in order to study lining behaviour during TBM operations, segments were also tested under high concentrated loads for reproducing the excavation phase. Three main reinforcement solutions have been analysed: macro-synthetic fibres only (MSFRC segments), combination of an optimized amount of rebars and macro-synthetic fibres (Hybrid segments) and the reference solution made by conventional bars reinforcement (RC segments).
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References
ITA report n. 16: Twenty years of FRC tunnel segments practice: lessons learnt and proposed design principles, p. 71 (2016). ISBN 978-2-970-1013-5-2
fib bulletin No. 83: Precast tunnel segments in fibre-reinforced concrete, fib WP 1.4.1, p. 168 (2017). ISBN: 978-2-88394-123-6
Caratelli, A., Meda, A., Rinaldi, Z., Romualdi, P.: Structural behaviour of precast tunnel segments in fiber reinforced concrete. Tunn. Undergr. Space Technol. 26, 284–291 (2011). https://doi.org/10.1016/j.tust.2010.10.003
Di Carlo, F., Meda, A., Rinaldi, Z.: Design procedure of precast fiber reinforced concrete segments for tunnel lining construction. Struct. Concr. 17(5), 747–759 (2016)
Tiberti, G., Conforti, A., Plizzari, G.A.: Precast segments under TBM hydraulic jacks: experimental investigation on the local splitting behavior. Tunn. Undergr. Space Technol. 50, 438–450 (2015). https://doi.org/10.1016/j.tust.2015.08.013
FIB Model Code for Concrete Structures 2010: Ernst & Sohn, p. 434 (2013). ISBN 978-3-433-03061-5
Di Prisco, M., Tomba, S., Bonalumi, P., Meda, A.: On the use of macro synthetic fibres in precast tunnel segments. In: Proceedings of the International Conference Fibre Concrete 2015 (FC2015), Prague, Czech Republic, pp. 478–483 (2015)
Conforti, A., Tiberti, G., Plizzari, G.A., Caratelli, A., Meda, A.: Precast tunnel segments reinforced by macro-synthetic fibers. Tunn. Undergr. Space Technol. 63, 1–11 (2017). https://doi.org/10.1016/j.tust.2016.12.005
Conforti, A., Trabucchi, I., Tiberti, G., Plizzari, G.A., Caratelli, A., Meda, A.: Precast tunnel segments for metro tunnel lining: a hybrid reinforcement solution using macro-synthetic fibers. Eng. Struct. 199 (2019). https://doi.org/10.1016/j.engstruct.2019.109628
Trabucchi, I., Conforti, A., Tiberti, G., Mudadu, A., Plizzari, G.A., Winterberg, R.: Flexural behaviour of precast tunnel segments reinforced by macro-synthetic fibres. In: Proceedings of the World Tunnel Congress 2019 (WTC2019), Naples, Italy, p. 9 (2019)
EN 14651: Test method for metallic fibre concrete–measuring the flexural tensile strength (limit of proportionally (LOP), residual); European Committee for Standardization, p. 18 (2005)
Acknowledgements
The Authors are grateful to TETRARENT S.r.L. for the grant of segment formworks. Moreover, the Authors would like to express their gratitude to Engs. A. Piardi, S. Salem, D. Rivetta and S. Treccani for their support during the experimental activities.
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Trabucchi, I., Mudadu, A., Tiberti, G., Conforti, A., Plizzari, G., Winterberg, R. (2022). Structural Behavior of Precast Tunnel Segments Reinforced by Macro-synthetic Fibers During Temporary Loading Phases. In: Serna, P., Llano-Torre, A., Martí-Vargas, J.R., Navarro-Gregori, J. (eds) Fibre Reinforced Concrete: Improvements and Innovations II. BEFIB 2021. RILEM Bookseries, vol 36. Springer, Cham. https://doi.org/10.1007/978-3-030-83719-8_61
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DOI: https://doi.org/10.1007/978-3-030-83719-8_61
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