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Hybrid precast tunnel segments in fiber reinforced concrete with glass fiber reinforced bars

机译：玻璃纤维增​​强筋的​​纤维混凝土混合预制隧道段

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摘要

The interest in using fiber reinforced concrete (FRC) for the production of precast segments in mechanical excavated tunnel lining is continuously growing, as witnessed by the studies available in literature and by the actual applications. The possibility of adopting a hybrid solution of FRC tunnel segments with Glass Fiber Reinforced Polymer (GFRP) reinforcement is investigated herein. The proposed solution can cover the situations in terms of requirements that cannot be satisfied with the FRC solution only. On the same way the use of GFRP bars can avoid the problems related to the use of traditional steel rebars. A typical metro tunnel geometry is considered, and full-scale segments are designed, cast and experimentally validated. In particular, one flexural and one point load full-scale tests are carried out, for the evaluation of the structural performances (both in terms of structural capacity and crack pattern evolution) of tunnel segments with hybrid solution, under bending, and under the TBM thrust. The experimental behaviors are compared with the ones obtained on fiber reinforced only segments, with the same geometry and concrete material. Finally, the obtained results are discussed, and the effectiveness of the proposed technical solution, in increasing the bending resistance and, mainly in reducing the crack width under flexural and TBM thrust, is highlighted.
机译：如文献中的研究和实际应用所证明的那样，使用纤维增强混凝土（FRC）生产机械开挖隧道衬砌中预制段的兴趣不断增长。本文研究了采用FRC隧道段与玻璃纤维增​​强聚合物（GFRP）增强材料混合解决方案的可能性。提出的解决方案可以满足仅FRC解决方案无法满足的要求方面的情况。以相同的方式使用GFRP钢筋可以避免与使用传统钢筋相关的问题。考虑了典型的地铁隧道几何形状，并设计，浇筑和试验验证了全尺寸路段。特别是，进行了一次弯曲和单点荷载的全尺寸试验，以评估在混合作用下，弯曲和TBM条件下隧道段的结构性能（在结构承载力和裂缝模式演变方面）推力。将实验行为与具有相同几何形状和混凝土材料的仅纤维增强段获得的行为进行了比较。最后，讨论了所获得的结果，并着重指出了所提出的技术解决方案在提高抗弯性，主要是减小弯曲和TBM推力下的裂缝宽度方面的有效性。

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