The proposed paper concerns the optimized design of FRC tunnel linings with special emphasis to precast tunnel elements. FRC represents a reinforcement spread out into the segment, including the concrete cover that, in tunnel segments, is often considerably thick for the sake of fire protection requirements. Moreover, FRC improves the resistance to impact loading, due to its toughness, and allows a better control of cracking, with advantages in terms of durability of the members. The optimized reinforcement is based on to use of both traditional reinforcement (longitudinal rebars), adequate for localized stress, and of FRC, adequate for diffusive stress, that allows a better crack control and a significantly reduction of the amount of transverse reinforcement. A proper combination of diffused (fibers) and localized (rebars) reinforcement guarantees the performance requirements at the lowest costs. FRC tunnel segments are better designed by taking into account the toughness offered by fibers, which generally provide a significant residual strength to the cross section.

Fiber Reinforced Concrete for tunnel linings

PLIZZARI, Giovanni;TIBERTI, Giuseppe
2010-01-01

Abstract

The proposed paper concerns the optimized design of FRC tunnel linings with special emphasis to precast tunnel elements. FRC represents a reinforcement spread out into the segment, including the concrete cover that, in tunnel segments, is often considerably thick for the sake of fire protection requirements. Moreover, FRC improves the resistance to impact loading, due to its toughness, and allows a better control of cracking, with advantages in terms of durability of the members. The optimized reinforcement is based on to use of both traditional reinforcement (longitudinal rebars), adequate for localized stress, and of FRC, adequate for diffusive stress, that allows a better crack control and a significantly reduction of the amount of transverse reinforcement. A proper combination of diffused (fibers) and localized (rebars) reinforcement guarantees the performance requirements at the lowest costs. FRC tunnel segments are better designed by taking into account the toughness offered by fibers, which generally provide a significant residual strength to the cross section.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11379/34435
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