Finite element (FE) modeling techniques were developed to isolate the different contributions of corrosion damage to structural response of experimental reinforced concrete beams with shear-dominated behavior. Corrosion-damage parameters included concrete cover spalling due to the expansion of corrosion products; uniform stirrup cross-sectional loss from corrosion; localized stirrup cross-sectional loss due to pitting; debonding of corrosion-damaged stirrups from the concrete. FE analyses were performed including both individual and combined damages. The FE results matched experimental results well and quantitatively estimated capacity reduction of the experimental specimens. 1. Introduction Many conventionally reinforced concrete (CRC) structures are exposed to conditions that can lead to corrosion of the embedded reinforcing steel. These include coastal structures subjected to wind-born salt spray and seawater as well as bridges subjected to deicing salt. Engineers often must evaluate existing structures that exhibit corrosion-induced damage, and only limited information is available for condition assessment and structural evaluation. A tool that has become widely used for analysis of structures is finite element analysis; however, application to corrosion-damaged structures requires modeling assumptions. Assessment of the sensitivity of results to the modeling assumptions requires parametric study and validation with experimental results. This paper presents modeling details for finite element analysis of CRC beams with corrosion damage to shear reinforcement and provides comparison of analyses with large-scale experiments on beam specimens for a range of corrosion-damaged components. Previous research on the effects of corrosion damage has focused on flexural behavior of reinforced concrete (RC) members [1–4], the effects of corrosion on the bond behavior of corroded rebar [5, 6], and the effects of cross-section loss due to corrosion on the mechanical properties of rebar [7, 8]. Previous research on the effects of corrosion on shear behavior of RC beams is lacking. An experimental study on the capacity assessment of RC beams with corrosion damage to the transverse steel was accomplished [9]. This research focused on the behavior of RC beams exhibiting various levels of corrosion damage to the transverse steel. Detailed experimental observations as well as applications of traditional analysis techniques to predict capacity are presented in the works of Higgins and Farrow III [10] and Higgins et al. [11]. These beam specimens were used to aid the
References
[1]
A. A. Almusallam, A. S. Al-Gahtani, A. R. Aziz, F. H. Dakhil, and Rasheeduzzafar, “Effect of reinforcement corrosion on flexural behavior of concrete slabs,” Journal of Materials in Civil Engineering, vol. 8, no. 3, pp. 123–127, 1996.
[2]
G. J. Al-Sulaimani, M. Kaleemullah, I. A. Basunbul, and Rasheeduzzafar, “Influence of corrosion and cracking on bond behavior and strength of reinforced concrete members,” ACI Structural Journal, vol. 87, no. 2, pp. 220–231, 1990.
[3]
J. G. Cabrera, “Deterioration of concrete due to reinforcement steel corrosion,” Cement and Concrete Composites, vol. 18, pp. 47–59, 1996.
[4]
P. S. Mangat and M. S. Elgarf, “Strength and serviceability of repaired reinforced concrete beams undergoing reinforcement corrosion,” Magazine of Concrete Research, vol. 51, no. 2, pp. 97–112, 1999.
[5]
L. Amleh and S. Mirza, “Corrosion influence on bond between steel and concrete,” ACI Structural Journal, vol. 96, no. 3, pp. 415–423, 1999.
[6]
K. Stanish, R. D. Hooton, and S. J. Pantazopoulou, “Corrosion effects on bond strength in reinforced concrete,” ACI Structural Journal, vol. 96, no. 6, pp. 915–921, 1999.
[7]
A. A. Almusallam, “Effect of degree of corrosion on the properties of reinforcing steel bars,” Construction and Building Materials, vol. 15, pp. 361–368, 2001.
[8]
R. Palsson and M. S. Mirza, “Mechanical response of corroded steel reinforcement of abandoned concrete bridge,” ACI Structural Journal, vol. 99, no. 2, pp. 157–162, 2002.
[9]
W. C. Farrow III, Shear capacity assessment of corrosion-damaged reinforced concrete beams, M.S. thesis, Department of Civil, Construction and Environmental Engineering, Oregon State University, Corvallis, Ore, USA, 2002.
[10]
C. Higgins and W. C. Farrow III, “Tests of reinforced concrete beams with corrosion-damaged stirrups,” ACI Structural Journal, vol. 103, no. 1, pp. 133–141, 2006.
[11]
C. Higgins, F. C. William III, T. Potisuk, et al., “Shear capacity assessment of corrosion-damaged reinforced concrete beams,” Tech. Rep. FHWA-OR-RD-04-06, Federal Highway Administration, Washington, DC, USA, 2003.
[12]
M. Suidan and W. C. Schnobrich, “Finite element analysis of reinforced concrete,” Journal of the Structural Division, vol. 99, no. 10, pp. 2109–2122, 1973.
[13]
N. J. Stevens, S. M. Uzumeri, and M. P. Collins, Analytical Modelling of Reinforced Concrete Subjected to Monotonic and Reversed Loadings, Publication no. 87-1, Department of Civil Engineering, University of Toronto, Toronto, Canada, 1987.
[14]
F. J. Vecchio, “Nonlinear finite element analysis of reinforced concrete membranes,” ACI Structural Journal, vol. 86, no. 1, pp. 26–35, 1989.
[15]
P. Bhatt and M. Abdel Kader, “Prediction of shear strength of reinforced concrete beams by nonlinear finite element analysis,” Computers and Structures, vol. 68, no. 1–3, pp. 139–155, 1998.
[16]
K. Maekawa, A. Pimanmas, and H. Okamura, Nonlinear Mechanics of Reinforced Concrete, Spon Press, New York, NY, USA, 2003.
[17]
T. Potisuk, Analysis of conventionally reinforced concrete deck girder bridges for shear, Ph.D. thesis, Department of Civil, Construction and Environmental Engineering, Oregon State University, Corvallis, Ore, USA, 2004.
[18]
H. J. Dagher and S. Kulendran, “Finite element modeling of corrosion damage in concrete structures,” ACI Structural Journal, vol. 89, no. 6, pp. 699–708, 1992.
[19]
D. Coronelli and P. Gambarova, “Structural assessment of corroded reinforced concrete beams: modeling guidelines,” Journal of Structural Engineering, vol. 130, no. 8, pp. 1214–1224, 2004.
[20]
Oregon Department of Transportation, Bridge Inspection Pocket Coding Guide, Oregon Department of Transportation, Salem, Ore, USA, 2001.
[21]
Federal Highway Administration, “Recording and coding guide for the structure inventory and appraisal of the nation's bridges,” Tech. Rep. FHWA-PD-96-001, Federal Highway Administration, Washington, DC, USA, 1995.
C. E. Todeschini, A. C. Bianchini, and C. E. Kesler, “Behavior of concrete columns reinforced with high strength steels,” ACI Journal Proceedings, vol. 61, no. 6, pp. 701–716, 1964.
[24]
M. T. M. Soliman and C. W. Yu, “The flexural stress-strain relationship of concrete confined by rectangular transverse reinforcement,” Magazine of Concrete Research, vol. 19, no. 61, pp. 223–238, 1967.
[25]
D. C. Kent and R. Park, “Flexural Members with Confined Concrete,” Journal of the Structural Division, vol. 97, no. 7, pp. 1969–1990, 1971.
