Numerical 3D Modelling of Anchorage, Corrosion and Spalling

Paper in proceeding, 2015

The aim of this study is to enhance our understanding of anchorage capacity in reinforced concrete structures with corrosion-induced cover spalling. Our objectives were to study the influence of corrosion-induced cover spalling on bond strength. Thus, earlier developed bond and corrosion models suited for detailed 3D finite element (FE) analysis were first combined with a new computation scheme to simulate corrosion-induced cover spalling. The 3D FE analyses were validated through experiments. The application of 3D FE analysis showed that the corrosion of stirrups advances the emergence of cracking and spalling, while bond strength is only slightly influenced by the corrosion of stirrups after cover spalling if early yielding of stirrups had not taken place. Moreover, it was shown that stresses in the stirrups due to corrosion in adjacent bars rapidly diminished within a short distance from the main bar, and that the corrosion of stirrups influenced the shear capacity more prominent than the induced stresses in stirrups due to the corrosion of main bars.