On the design of steel fiber reinforced concrete tunnel lining segments
On the design of steel fiber reinforced concrete tunnel lining segments
SORELLI ; TOUTLEMONDE
Type de document
COMMUNICATION AVEC ACTES INTERNATIONAL (ACTI)
Langue
anglais
Auteur
SORELLI ; TOUTLEMONDE
Résumé / Abstract
The structural applications of Steel Fiber Reinforced Concrete (SFRC) have recently been increasing due to the improvement of material properties, such as in the material toughness under tension and durability. However, because the behavior of such structures is fairly different from conventional Reinforced Concrete (RC) structures the classic design method should be critically reviewed considering the post-cracking resistant mechanism. This work focuses on the tunnel lining segments made of steel fibre reinforced concrete, as an alternative to conventional RC segments. Based on an accurate experimental investigation on full scale specimens, a smeared crack model, which implements the Hilleborg's criteria was used. In order to assess the SFRC reliability, the tensile constitutive law, which represents the post-cracking resistant mechanism offered by the fibers, was chosen on a probabilistic fashion on the basis of a wide population of tensile tests on cylinders drilled out from a reference full scale specimen. Moreover, simplified design methods, such as the one based on the "struts and ties" models, and the method derived from the national guidelines AFREM, were reviewed and verified by means of a parametric analysis.
