Published: 2017-12-30

Optimization of hybrid reinforcement in precast concrete linings using numerical analysis

Andrea Gorino , Alessandro P. Fantilli , Bernardino Chiaia

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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Gorino, A., Fantilli, A. P., & Chiaia, B. (2017). Optimization of hybrid reinforcement in precast concrete linings using numerical analysis. Roads and Bridges - Drogi I Mosty, 16(4), 309–323. https://doi.org/10.7409/rabdim.017.020

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