Roads and Bridges - Drogi i Mosty
16, 4, 2017, 309-323

Optimization of hybrid reinforcement in precast concrete linings using numerical analysis

Andrea Gorino Mail
Politecnico di Torino, Department of Structural, Building and Geotechnical Engineering, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
Alessandro P. Fantilli Mail
Politecnico di Torino, Department of Structural, Building and Geotechnical Engineering, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
Bernardino Chiaia Mail
Politecnico di Torino, Department of Structural, Building and Geotechnical Engineering, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
Published: 2017-12-30

Abstract

Concrete mixtures reinforced with a combination of steel rebar and fibers, i.e., Hybrid Reinforced Concretes (HRC), are frequently used in segmental precast tunnel linings. As massive cross-sections are usually adopted in these structures, only the minimum reinforcement is necessary to prevent the brittle failure. To study the brittle/ductile behavior of HRC tunnel segments in bending, the flexural responses of Lightly Reinforced Concrete (LRC) and that of Fiber-Reinforced Concrete (FRC) elements are modelled and combined herein. By means of this combination, the minimum reinforcement of HRC segments can be determined with a new design-by-testing procedure, in which the ductility index DI should be equal to zero. As a result, the minimum hybrid reinforcement can be defined through a linear combination of the minimum area of rebar and the minimum fiber volume fraction of LRC and FRC segments, respectively.

Keywords


ductility index, fibers, hybrid reinforced concrete, minimum reinforcement, precast concrete segments, rebar.

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References


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Optimization of hybrid reinforcement in precast concrete linings using numerical analysis

  
Gorino, Andrea; Fantilli, Alessandro P.; Chiaia, Bernardino. Optimization of hybrid reinforcement in precast concrete linings using numerical analysis. Roads and Bridges - Drogi i Mosty, [S.l.], v. 16, n. 4, p. 309-323, dec. 2017. ISSN 2449-769X. Available at: <>. Date accessed: 19 Dec. 2018. doi:http://dx.doi.org/10.7409/rabdim.017.020.