Propagation of a cohesive crack crossing a reinforcement layer

摘要: This paper analyzes the propagation of a cohesive crack through reinforcement layer and gives solution that can be used for any specimen loading condition. Here it faces case reinforced prismatic beam loaded at three points. Reinforcement is represented by means free-slip bar bridging cracked section, anchored both sides certain distance called effective slip length. length obtained making mechanically equivalent to actual adherent reinforcement. With this model, development depends on parameters (apart from those represent geometry): size specimen, cover thickness strength. The latter ratio its adherence matrix while in elastic regime; otherwise, yielding influences first stages crack, thus also affects value load peak. computed load-displacement curves display noticeable effect, as real materials do. Finally, model able fit available experimental results, accurately reproduces influence size, amount variations tests.