ABSTRACT
However, most of the research is limited in the study of the causes and mechanisms of the reinforcement corrosion (Hanjari 2011), relatively less work is executed the practically important aspect of evaluating the residual structural performance of the corroded concrete structures. Andrés A. et al. (2007) has focused in an experimental investigation about the relationship between the loss of flexure capacity and the loss of steel cross-section of the corroded beams, and obtained the conclusion that the maximum pit depth was the most important factor impacting the load capacity reduction in the corroded beams. Mark G. Stewart (2009) has studied the mechanical behavior of pitting corrosion, including the flexural and shear reinforcement which can significantly affect the mechanical behavior and the ductile yielding, whereas a higher corrosion loss can lead to brittle fracture. But there is still a weak point that most of the corrosion process in the research was accelerated either by the application of an impressed current or an admixture of CaCl2 into the concrete (Xu 2010), the conclusions of different models can vary largely, which
4 RESIDUAL MECHANICAL BEHAVIOR
Figure 3 shows the loads-deflection curves. For under-reinforced beams which failed by tensile rebars failure, the corrosion do not change the failure mode but reduced strongly the ductility of the
beam. The loss of capacity is linked to the loss of steel-cross section at the failure location. Nevertheless, it seems that corrosion slightly modify the post-yielding hardening properties of steel bars, which lead to a difference in yielding capacity versus the ultimate capacity.
