The use of FRC in tunnels segmental linings is continuously growing in the actual applications. In some cases, during the rings installation, irregularities can be generated due to misalignment of the segments, which can cause a gap on the rings side. This irregularity can jeopardize the integrity and performance of the newly installed segment. The proposed hybrid solution of FRC segments with Glass Fiber Reinforced Polymer (GFRP) bars can overcome these situations, which cannot be satisfied with FRC solution only, by means of an “elastic-return action” guaranteed by the GFRP reinforcement. Two full-scale tests, simulating the TBM thrust for which irregular support condition occur, were car-ried out. Based on the obtained results, proposed hybrid solution shows full recovery of the starting configuration with residual crack width of 92% less compared to FRC solution only.
Spagnuolo, S. (2019). Influence of non-uniform support on FRC and hybrid precast tunnel segments with glass fiber reinforced polymer bars under TBM thrust. In First fib Italy YMG Symposium on Concrete and Concrete Structures, Parma (2019) – Proceedings (pp.24-31).
Influence of non-uniform support on FRC and hybrid precast tunnel segments with glass fiber reinforced polymer bars under TBM thrust
Simone Spagnuolo
2019-01-01
Abstract
The use of FRC in tunnels segmental linings is continuously growing in the actual applications. In some cases, during the rings installation, irregularities can be generated due to misalignment of the segments, which can cause a gap on the rings side. This irregularity can jeopardize the integrity and performance of the newly installed segment. The proposed hybrid solution of FRC segments with Glass Fiber Reinforced Polymer (GFRP) bars can overcome these situations, which cannot be satisfied with FRC solution only, by means of an “elastic-return action” guaranteed by the GFRP reinforcement. Two full-scale tests, simulating the TBM thrust for which irregular support condition occur, were car-ried out. Based on the obtained results, proposed hybrid solution shows full recovery of the starting configuration with residual crack width of 92% less compared to FRC solution only.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
