Combined effect of reinforcement corrosion and seismic loads on RC bridge columns: modelling

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Conference2nd International Engineering Mechanics and Materials Specialty Conference: 14 June 2011, Ottawa, Ontario
Pages110; # of pages: 10
Subjectnonlinear elasto-plastic modeling, finite element, corrosion, seismic, bridge column; Bridges; Corrosion (of reinforced concrete)
AbstractColumns are often the most vulnerable elements in reinforced concrete (RC) bridges as their failure could lead to bridge collapse. Characteristically, columns are subjected to combined static and dynamic eccentric and lateral forces due to traffic, self-weight, and earthquake loads. For the assessment of bridge columns in seismic areas, it is essential to evaluate their state of damage, strength and deformation capacity over their service life. In this paper, a nonlinear elasto-plastic numerical model to simulate bridge columns under the combined effects of reinforcement corrosion and seismic excitation is presented. The study includes the development of a comprehensive and yet simple tool to evaluate the seismic performance, and the residual strength and deformation capacity of aging RC bridge columns suffering from reinforcement corrosion. The model enables evaluating aging and deteriorated RC bridge columns safety, the decline in their energy dissipation capability, and the level of earthquake excitation that they may survive. Hence, the model can represent a useful tool for bridge engineers to optimize the use of available resources and define the critical capacity of bridge columns against earthquake events. It is found that the model is efficient in simulating the behaviour of the column under corrosion and seismic loads. From the case study, it is found that the load carrying capacity of the corroded column is much lower than that of non-corroded columns. The results show significant reduction in the column displacement capacity and energy dissipation capability due to rebar corrosion. The corrosion-induced damage could result in accelerated degradation of the bridge columns and reduce its ultimate strength.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number54456
NPARC number20373816
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Record identifier14e9fdab-2699-4748-9d6e-0fabeb5e0da0
Record created2012-07-23
Record modified2016-05-09
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