Concrete for Tunnel Liners:Behavior of Steel Fiber Reinforced Concrete Under Combined Loads.

摘要

This study was undertaken to determine the behavior of a steel fiber reinforced concrete member subjected to combined compressive and flexural loads. In addition,information was obtained on the tensile stress-strain relationship,the modulus of elasticity in compression,and Poisson's ratio. Interaction diagrams are presented for concretes made with two quick setting cements and fiber contents of 0.9, 1.2and 1.5percent by volume. Compressive failures,tensile failure,and simultaneous compressive-tensile failures were obtained depending on the moment to axial load ratio. A method is presented for determining the tensile stress-strain relationship for a length of beam immediately surrounding a crack. This tensile stress-strain relationship makes possible a computerized post-crack analysis of a fiber reinforced concrete structures. Fiber content,fiber orientation,and type of cement appear to have little affect on Poisson's ratio but do influence the modulus of elasticity and the strength.