To reinforce cementitious matrix, a combination of steel rebar and fibers can be used in massive concrete members, e.g., tunnel linings. Due to their large cross-sections, and to the moderate state of stress, these Hybrid Reinforced Concrete (HRC) elements typically contain the minimum reinforcement to prevent the brittle failure. Thus, a model capable to predict the flexural behavior of such HRC members is of practical interest. The multi-scale approach proposed herein is based on the flexural response of both Lightly Reinforced Concrete (LRC) and Fiber-Reinforced Concrete (FRC) beams, containing only rebar and fibers, respectively. As for LRC and FRC elements, the model provides the so-called Ductility Index (DI), used to define the minimum reinforcement of HRC beams. According to the results of several tests, the transition be-tween the brittle (DI<0) and ductile (DI>0) response indicates the optimal value of the hybrid reinforcement.

Multi-scale tension stiffening approach for the minimum reinforcement of hybrid concrete beams / Fantilli, ALESSANDRO PASQUALE; Gorino, Andrea; Chiaia, Bernardino. - STAMPA. - (2018), pp. 1-10. (Intervento presentato al convegno Computational Modelling of Concrete Structures (EURO-C 2018) tenutosi a Bad Hofgastein nel February 26 - March 1, 2018).

Multi-scale tension stiffening approach for the minimum reinforcement of hybrid concrete beams

Alessandro Fantilli;Andrea Gorino;Bernardino Chiaia
2018

Abstract

To reinforce cementitious matrix, a combination of steel rebar and fibers can be used in massive concrete members, e.g., tunnel linings. Due to their large cross-sections, and to the moderate state of stress, these Hybrid Reinforced Concrete (HRC) elements typically contain the minimum reinforcement to prevent the brittle failure. Thus, a model capable to predict the flexural behavior of such HRC members is of practical interest. The multi-scale approach proposed herein is based on the flexural response of both Lightly Reinforced Concrete (LRC) and Fiber-Reinforced Concrete (FRC) beams, containing only rebar and fibers, respectively. As for LRC and FRC elements, the model provides the so-called Ductility Index (DI), used to define the minimum reinforcement of HRC beams. According to the results of several tests, the transition be-tween the brittle (DI<0) and ductile (DI>0) response indicates the optimal value of the hybrid reinforcement.
2018
9781138741171
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2742852
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