Blast and Fire Design of Precast Layered FRC Tunnel Segments

Abstract

multi–layered tunnel segment made of fiber–reinforced concrete is proposed to improve blast and fire resistance. Shock tube tests on 2-layers circular plates have pointed out that no delamination takes place when exposed to blast waves. The tunnel dynamic response under internal blast loads, in the form of pressure–impulse diagrams, is presented in this paper. The layered precast tunnel segment solution made of different fiber–reinforced cementitious composites is compared with a traditional solution where the lining section is made of reinforced concrete. The results presented show the better performance of the layered solution compared to the traditional one if subjected to internal explosion and in case of pre–explosion fire actions