Crack bridging in fiber reinforced cementitious composites with slip-hardening interfaces

摘要

A new crack bridging model accounting for slip-hardening interfacial shear stress is derived for randomly oriented discontinuous flexible fibers in cement-based composites, based on a micromechanics analysis of single fiber pull-out. The complete composite bridging stress versus crack opening curve (|ò_B-|? relation) and associated fracture energy are theoretically determined.