Pushover Analysis of Reinforced Concrete Bridges under Chloride-Induced Corrosion

Document Type : Research Article


1 Department of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, I

2 Department of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, Iran


Long-term seismic performance determination of reinforced concrete bridges is one of the effective factors in service life estimation of these structures. Chloride induced corrosion results in deterioration of critical members in the service life of reinforced concrete bridges and therefore leads to degradation of long-term seismic performance of the bridge. Due to seismicity and high rate of corrosion in reinforced concrete structures due to the corrosive environmental condition in Persian Gulf region, evaluation of corrosion-induced degradation on the long-term seismic performance of existing bridges in this region has a high importance. In order to evaluate this problem, at first based on studies done related to Persian Gulf region, corrosion initiation time of columns as critical seismic members of the bridge has been determined. Then effects of corrosion on the reinforced concrete column at specific time intervals (0, 15, 30, 45, 60, 75, 90 years) in bridge service life have been calculated. Effects of corrosion include degradation of cover and core concrete, steel, and bonding between concrete and steel that result in modification of stress-strain relationship of materials. In the next step, at each time interval based on the modified stress-strain relationship of materials, moment-curvature analysis of bridge column conducted and characteristics of plastic hinge have been determined. Finally, based on plastic hinge characteristic at each time interval, pushover analysis of bridge in longitudinal and transverse directions conducted and bridge capacity curves at mentioned time intervals have been compared. Results indicate the time-dependent degradation of bridge capacity under corrosion. According to the obtained results, in order to ensure the long-term seismic performance of reinforced concrete bridges in corrosive environments, value for an increase of design base shear has been proposed.


Main Subjects

[1] C. Q., Li, J. J., Zheng, Propagation of reinforcement corrosion in concrete and its effects on structural deterioration, Magazine of Concrete Research, 57(5) (2005) 261-71.
[2] X., Shi, N., Xie, K., Fortune, J., Gong, Durability of steel reinforced concrete in chloride environments: An overview, Construction and Building Materials, 30 (2012) 125-138.
[3] F. J., Molina, C., Alonso, C., Andrade, Cover cracking as a function of rebar corrosion: part 2-numerical model, Materials and structures, 26(9) (1993) 532-548.
[4] D., Coronelli, P., Gambarova, Structural assessment of corroded reinforced concrete beams: modeling guidelines, Journal of Structural Engineering, 130(8) (2004) 1214-1224.
[5] M. P., Enright, D. M., Frangopol, Service-life prediction of deteriorating concrete bridges, Journal of Structural engineering, 124(3) (1998) 309-317.
[6] H. S., Lee, Y. S., Cho, Evaluation of the mechanical properties of steel reinforcement embedded in concrete specimen as a function of the degree of reinforcement corrosion, International journal of fracture, 157(1-2) (2009) 81-88.
[7] A., Castel, I., Khan, R. I., Gilbert, Development length in reinforced concrete structures exposed to steel corrosion: A correction factor for AS3600 provisions, Australian Journal of Structural Engineering, 16(2) (2015) 89-97.
[8] K., Bhargava, A. K., Ghosh, Y., Mori, S., Ramanujam, Suggested empirical models for corrosion-induced bond degradation in reinforced concrete, Journal of structural engineering, 134(2) (2008) 221-230.
[9] K. A., Vu, M. G., Stewart, Structural reliability of concrete bridges including improved chloride-induced corrosion models, Structural safety, 22(4) (2000) 313-333.
[10] T., Guo, R., Sause, D. M., Frangopol, A., Li, Time-dependent reliability of PSC box-girder bridge considering creep, shrinkage, and corrosion, Journal of Bridge Engineering, 16(1) (2010) 29-43.
[11] C. K., Chiu, T., Noguchi, M., Kanematsu, Optimal maintenance plan for RC members by minimizing life-cycle cost including deterioration risk due to carbonation, Journal of advanced concrete technology, 6(3) (2008) 469-480.
[12] E., Martinelli, E., Erduran, Seismic Capacity Design of RC frames and environment-induced degradation of materials: Any concern?, Engineering Structures, 52 (2013) 466-477.
[13] L., Berto, R., Vitaliani, A., Saetta, P., Simioni, Seismic assessment of existing RC structures affected by degradation phenomena, Structural Safety, 31(4) (2009) 284-297.
[14] H., Yalciner, S., Sensoy, O., Eren, Time-dependent seismic performance assessment of a single-degree-of-freedom frame subject to corrosion, Engineering Failure Analysis, 19 (2012) 109-122.
[15] R., Kumar, P., Gardoni, M., Sanchez-Silva, Effect of cumulative seismic damage and corrosion on the life-cycle cost of reinforced concrete bridges, Earthquake Engineering & Structural Dynamics, 38(7) (2009) 887-905.
[16] J., Zhong, Seismic fragility estimates for corroded reinforced concrete bridge structures with two-column bents, PhD Thesis, Texas A&M University, Texas, (2008).
[17] J., A., Harvat, Effect of corrosion on the seismic response of a single-bent, reinforced concrete bridge”. PhD Thesis, Texas A&M University, Texas, (2009).
[18] J., Ghosh, J. E., Padgett, Aging considerations in the development of time-dependent seismic fragility curves, Journal of Structural Engineering, 136(12) (2010)1497-1511.
[19] F., Biondini, M., Vergani, Damage modeling and nonlinear analysis of concrete bridges under corrosion, In Sixth International Conference on Bridge Maintenance, Safety and Management (IABMAS 2012), Stresa, Italy, (2012) 8-12.
[20] Y. C., Ou, H. D., Fan, N. D., Nguyen, Long-term seismic performance of reinforced concrete bridges under steel reinforcement corrosion due to chloride attack, Earthquake Engineering & Structural Dynamics, 42(14) (2013) 2113-2127.
[21] M., Shekarchi, F., Moradi, Concrete durability issues in the Persian Gulf, InCBM-CI International Workshop, 200 (2007) 357-370.
[22] H. R., Ashrafi, A. A., Ramezanianpour, Model Presentation for the Chloride Diffusion in Silica Fume Concretes Based on the Experimental Results, PhD Thesis, Amirkabir University of Technology, Tehran, 2007. [In Persian]
[23] D. E., Choe, P., Gardoni, D., Rosowsky, T., Haukaas, Seismic fragility estimates for reinforced concrete bridges subject to corrosion, Structural Safety, 31(4) (2009) 275-283.
[24] T. T., Hsu, Unified theory of reinforced concrete, CRC press, Dec, (1992).
[25] J. B., Mander, Seismic design of bridge piers, PhD Thesis, University of Canterbury, Christchurch, N.Z, (1983).
[26] J. B., Mander, M. J., Priestley, R., Park, Theoretical stress-strain model for confined concrete, Journal of structural engineering, 114(8) (1988) 1804-1826.
[27] CSI., SAP2000- Linear and Nonlinear Static and Dynamic Analysis and Design of Three-Dimensional Structures: Basic Analysis Reference Manual. Computers and Structures, Inc, Berekeley, California, (2005).
[28] A., Aviram, K. R., Mackie, B., Stojadinović, Guidelines for nonlinear analysis of bridge structures in California. Pacific Earthquake Engineering Research Center, Berekeley, California, (2008).
[29] Caltrans., Caltrans Seismic Design Criteria Version 1.6. California Department of Transportation, Sacremento, California, (2010).
[30] XTRACT., Cross Section Analysis Program for Structural Engineers, IMBSEN & Associate Inc., USA, (2007).