Simplified finite element model for evaluation of ultimate capacity of corrosion-damaged reinforced concrete beam-columns

From National Research Council Canada

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DOIResolve DOI: https://doi.org/10.1007/s40091-018-0204-2
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Name affiliation
  1. National Research Council Canada. Construction
FormatText
TypeArticle
Journal titleInternational Journal of Advanced Structural Engineering
ISSN2008-3556
2008-6695
Subjectnonlinear finite element analysis; reinforcement corrosion; RC bridge column; semi-quantitative assessment framework; displacement field tuning convergence
Abstract
A simplified nonlinear finite element analysis (NLFEA) based on enhanced inspection, material testing, and nonlinear sectional analysis is introduced as part of a semi-quantitative assessment approach of aged beam-columns. The focus is on the evaluation of the structural performance and residual capacities of slab-on-girder bridge columns subjected to combined external loads and reinforcement corrosion. NLFEA takes into account different levels of geometrical, material, and bond damage due to reinforcement corrosion. At each load step of the nonlinear analysis process, NLFEA establishes the instantaneous stiffness of the structure through effective transfer of the instantaneous axial and flexural rigidities from the sectional level to the element level. The model adopts a displacement field tuning convergence approach that involves single or multiple correction phases satisfying the equilibrium and any user-defined displacement tolerance. The efficiency and accuracy of the proposed NLFEA is verified by comparison with test and analytical results from previous studies conducted on undamaged and corrosion-damaged structural elements. NLFEA proves to have high numerical stability and fast convergence, establishing its adoptability in large structural analysis/assessment frameworks. For corrosion-damaged beamcolumns, it is found that critical design sections do not necessarily remain critical for the structural evaluation.
Publication date
PublisherSpringer
LanguageEnglish
Peer reviewedYes
NPARC number23004457
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Record created2018-11-06
Record modified2019-03-11
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