Experiences in Barcelona with the use of fibres in segmental linings
journal contributionposted on 22.03.2018, 09:14 by Albert De la Fuente, Pablo Pujadas, Ana Blanco-Alvarez, Antonio Aguado
This paper presents the most outstanding experiences regarding the use of fibres as the main reinforcement in precast segmental linings in the metropolitan area of Barcelona. It is known that the addition of structural fibres improves, on the one hand, the mechanical behaviour of the structure during its construction, especially in cases such as the thrust of the jacks, and on the other hand it leads to a reduction of the global costs by reducing the conventional passive reinforcement. The aim of this paper consists in presenting three real experiences that are representative of the application of FRC in urban tunnels and a design methodology to take into account the structural contribution of the fibres. Two particular cases of the application of this design method are presented. In the first case, the use of 25kg/m 3 of fibres has led to a reduction of 70% of the conventional reinforcement initially proposed in the project. In the second one, which was planned to employ fibres but without considering its structural contribution, the parametric study reflected the possibility of reducing up to a 38% of the rebars adding 25kg/m 3 of steel fibres in the concrete mixture. In light of good results, construction companies in Spain have become aware of the advantages of using fibres in these structures and have carried out experimental stretches. This attitude has also been influenced by the approval of the new Spanish Code, which includes the FRC as a construction material with design purposes. © 2011 Elsevier Ltd.
The authors of this paper want to acknowledge the economical support provided in order to develop the study of the FontSanta-Trinitat Tunnel (FCC Construcción, S.A., OHL, S.A., and COPISA, S.A.) and the Terrassa Tunnel (FCC Construcción, S.A., OHL, S.A., and COPISA, S.A.). Likewise, this work has been possible thanks to the economical support received of the Research Project BIA2010 -17478: Procesos constructivos mediante hormigones reforzados con fibras.
- Architecture, Building and Civil Engineering