Abstract
The use of fibre reinforced concrete (FRC) to produce segmental linings of TBM-constructed tunnels is an increasing tendency. So far, more than 50 tunnels have been constructed with this structural material, in some of these even using solely fibres as reinforcement. Moreover, several design guidelines (e.g., fib Model Code 2010) already include the FRC as structural material. There also exist specific guidelines for the design of FRC precast segment linings (e.g., ITAtech Report/7-15 and ACI 544.7R-16). These guidelines deal with the design of FRC considering the traditional limit state safety format. Therefore, partial safety factors for both the loads (γ L ) and material strengths (γ M ) must be considered. In particular, the magnitude of γ M considered for compressive and tensile FRC strengths are assumed to be the same. Nonetheless, this assumption can be unrealistic, particularly in terms of flexural residual strength (f R ) since this property present higher scatter than the compressive strength (f c ). This is particularly true for elements with a reduced cracking surface (e.g., beams) due to the higher impact that uncertainties like fibre orientation and distribution have on the variability of f R . Therefore, this assumption can lead to lower reliability indexes (β) than those established for traditional reinforced concrete structures. However, this variability tends to decrease with the increase of the width of the cracked sections (e.g., slabs). The results of a structural reliability analysis carried out to calibrate partial safety factors for f R is presented. Full-scale bending tests on precast segments with different dimensions, amounts and type of fibers were considered. This partial safety factors could be used in the design of future precast FRC tunnel linings.
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsReferences
Abbas, S., Soliman, A., Nehdi, M.: Structural behaviour of ultra-high performance fibre reinforced concrete tunnel lining segments. FRC 2014 Joint ACI-fib International Workshop. Fibre Reinforced Concrete Applications, 24–25 July 2014, Montreal, Canada, pp. 532–543 (2014)
ACI 544.7R-16 Report on Design and Construction of Fiber-Reinforced Precast Tunnel Segments
Blanco, A., Pujadas, P., de la Fuente, A., Cavalaro, S., Aguado, A.: Application of constitutive models in European codes to RC–FRC. Constr. Build. Mater. 40, 246–259 (2013)
Bittencourt, T., Figueiredo, A., Bitencourt, L., Galobardes, I., Fernandes, J., Monte, R., Almeida, A.P.: Mechanical behaviour and durability assessment of precast concrete segments for TBM-constructed tunnels. Report CMSP, São Paulo-Metro Line 5. Universidade Politécnica de São Paulo, May 2016 (2016)
Blazejowsky, M.: Flexural behaviour of steel fibre reinforced concrete tunnel linings. The University of Western Ontario. Electronic Thesis and Dissertation Repository. Paper 768 (2012)
Conforti, A., Tiberti, G., Plizzari, G.A.: Splitting and crushing failure in FRC elements subjected to high concentrated loads. Composties Part B 105, 82–92 (2016)
de la Fuente, A., Blanco, A., Pujadas, P., Aguado, A.: Experiences in Barcelona with the use of fibres in segmental linings. Tunn. Undergr. Space Technol. 27(1), 60–71 (2012)
de la Fuente, A., Cavalaro, S.H.P., Aguado, A.: Results and analysis of the material characterization and full-scale bending tests on RC/FRC slabs. Report for AGJV (ACCIONA-GHELA Joint Venture). April 2016 (2016)
EN 14651:2005. Test method for metallic fibered concrete. Measuring the flexural tensile strength (limit of proportionality (LOP), residual)
fib Bulletins 65–66: Model Code 2010. fédération internationale du béton (fib), Lausanne (Switzerland) (2010)
Gettu, R., Barragán, B., García, T., Ramos, G., Fernández, C., Oliver, R.: Steel fiber reinforced concrete for the barcelona metro line 9 tunnel lining. In: Proceedings of the 6th RILEM Symposium on FRC. BEFIB 2004, Varenna (Italy), September 20–22, RILEM PRO 39, pp. 141–156 (2004)
ITATECH Activity Group Support. ITA-TECH design guidance for precast fibre reinforced concrete segments. Draft Report, July 2015
Liao, L., de la Fuente, A., Cavalaro, S., Aguado, A.: Design of FRC tunnel segments considering the ductility requirements of the MC 2010. Tunn. Undergr. Space Technol. 47(3), 200–210 (2015a)
Liao, L., de la Fuente, A., Cavalaro, S., Aguado, A., Carbonari, G.: Experimental and analytical study of concrete blocks subjected to concentrated loads with an application to TBM-constructed tunnels. Tunn. Undergr. Space Technol. 49(1), 295–306 (2015b)
Liao, L., de la Fuente, A., Cavalaro, S.H.P., Aguado, A.: Design procedure and experimental study on fibre reinforced concrete segmental rings for vertical shafts. Mat. Des. 92, 590–601 (2016)
Melchers, R.E.: Structural Reliability Analysis and Prediction, 2nd edn. Wiley, Chichester (1999). (reprinted June 2001, July 2002, and now reprinted on demand). (First edition 1986)
Poh, J., Tan, K.H., Peterson, G.L., Wenm, D.: Structural testing of steel fibre reinforced concrete (SFRC) tunnel lining segments in Singapore. In: WTC 2009, Budapest, Hungary (2009)
Pujadas, P., Blanco, A., Cavalaro, S.H.P., de la Fuente, A., Aguado, A.: Multidirectional double punch test to assess the post–cracking behaviour and fibre orientation of FRC. Constr. Build. Mater. 58, 214–224 (2014)
UNE 83515:2010. Fibre reinforced concrete. Determination of cracking strength, ductility and residual tensile strength. Barcelona test. Spanish Association for Standardization and Certification, AENOR. In English
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2018 Springer International Publishing AG
About this paper
Cite this paper
de la Fuente, A., Cugat, V., Cavalaro, S.H.P., Bairán, J.M. (2018). Partial Safety Factor for the Residual Flexural Strength of FRC Precast Concrete Segments. In: Hordijk, D., Luković, M. (eds) High Tech Concrete: Where Technology and Engineering Meet. Springer, Cham. https://doi.org/10.1007/978-3-319-59471-2_203
Download citation
DOI: https://doi.org/10.1007/978-3-319-59471-2_203
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-59470-5
Online ISBN: 978-3-319-59471-2
eBook Packages: EngineeringEngineering (R0)