Bem Analysis of Mixed-Mode Crack Propagation Due to Corrosion of Reinforcement in Concrete

Abstract

Due to expansion of corrosive products, cracks are nucleated around reinforcement in concrete. Initiation and propagation of these cracks are studied by experimentally and then analytically by the Boundary Element Method (BEM). The maximum circumferential stress criterion is applied to trace the crack extension of mixed-mode cracking. By employing the two-domain BEM, crack orientations are evaluated from the stress intensity factors of mode I and mode II. In BEM analysis, the ratios of stress intensity factors of mode I to mode II (K/K) are studied for the different types of crack patterns, which are observed as corrosion cracking.

Micromechanics of Corrosion Cracking in Reinforced Concrete by Ae

“…Sources, of which X ratios are between 40% and 60%, are referred to as the mixed mode. Figure 4 shows the geometry among the eigenvectors e 1 and e 3 , normal to crack surface n and crack motion direction l. Three eigenvectors are e 1 =l+n, e 2 = lxn, and e 3 =l-n. Vectors l and n can be recovered from the following relations, 5 ANALYTICALY MODEL Traces of the surface crack and the diagonal cracks are analyzed by BEM in a similar manner to the previous research (Farid and Ohtsu [3]). Initial two-domain elements are stitched at the interface jointing the initial crack tip with the final point.…”

“…The maximum circumferential stress criterion based on LEFM was successfully applied to trace the crack extension (Farid and Ohtsu [3]). By employing the two-domain BEM, cracking mechanisms are evaluated from the stress intensity factors.…”