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Advances in Materials Science and Engineering
Volume 2015, Article ID 413737, 7 pages
http://dx.doi.org/10.1155/2015/413737
Research Article

Numerical Investigation on Stress Concentration of Tension Steel Bars with One or Two Corrosion Pits

1Department of Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China
2School of Civil Engineering, Central South University, 22 Shaoshan South Road, Changsha 410075, China

Received 1 April 2015; Accepted 10 August 2015

Academic Editor: Ana S. Guimarães

Copyright © 2015 Jian Hou and Li Song. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Pitting corrosion has been observed in steel bars of existing reinforced concrete (RC) structures in different erosion environments and has been identified as a potential origin for fatigue crack nucleation. In the present study, under uniaxial tension loading, stress distribution in the steel bars with one or two semiellipsoidal corrosion pits has systematically been investigated by conducting a series of three-dimensional semiellipsoidal pitted models. Based on the finite element analyses, it is shown that stress concentration factor (SCF) increases linearly with increasing pit aspect ratio (a/b) and increases nonlinearly with increasing pit relative depth (a/R) for single corrosion pit problem. For double corrosion pits problem, the SCF decreases nonlinearly with increasing angle of two transverse pits (θ). The interaction of two longitudinal pits can be ignored in the calculation of SCF even if the distance of two pits (d) is very small.