Four levels to assess anchorage capacity of corroded reinforcement in concrete

Tahershamsi, Mohammad; Fernandez, Ignasi; Zandi, Kamyab; Lundgren, Karin

doi:10.1016/j.engstruct.2017.06.024

Cited by 13 publications

(12 citation statements)

References 30 publications

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“…Therefore, the utilisation of simplified 1D bondslip models may result in high inaccuracies when describing anchorage failure due to splitting and the push out of steel reinforcement. This 1D bond-slip model problem was also reported within reference (Tahershamsi et al 2017). Consequently, the use of more advanced modelling approaches that account for splitting effects would be more suitable to reproduce the structural behaviour in such situations.…”

Section: Corroded Rc Beam Specimenssupporting

confidence: 53%

“…To pursue such simplifications, the integration of some of the aforementioned multi-directional effects has been carried out into simpler models such as 3D beam elements or analytical expressions that can account for some of the described effects (Biondini and Vergani 2014;Fernandez et al 2016c;Stewart 2009;Biondini et al 2004;Ferreira et al 2014;Bernat et al 2012;Oliveira 2008). In addition, new approaches to reproduce the 3D complex behavior of the bond effects in RC concrete beams have been developed to include some of the multiaxial effects in simple bond slip relations that have proven to be on the safe side for the analysis of complex problems such as anchorage capacity of corroded bars (Tahershamsi et al 2017;Lundgren et al 2012;Blomfors et al 2018;Zhang et al 2009;Bhargava et al 2007).…”

Section: Modelling Approaches For the Assessment Of Corroded Rc Strucmentioning

confidence: 99%

“…The bond-slip relationship was implemented by utilising an embedded reinforcing steel approach with interface elements including a non-linear bond relationship to the concrete. The scope, suitability, and advantages and disadvantages of the completed modelling have been previously studied (Tahershamsi et al 2017).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Ultimate Capacity of Corroded Statically Indeterminate Reinforced Concrete Members

Fernandez

Herrador

Bernat

et al. 2018

Int J Concr Struct Mater

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The corrosion of steel reinforcement is commonly believed to be the primary cause of structural deterioration of reinforced concrete (RC) structures; as a result of this deterioration, a RC structure can incur a considerable reduction in structural serviceability and safety. Because of their inherent redundancy, statically indeterminate structures develop resistant mechanisms that can potentially assist in delaying the collapse of severely damaged RC structures. In order to experimentally demonstrate these resistant mechanisms, four groups of three two-span continuous RC beam members each were deteriorated using induced corrosion methods and tested to failure under monotonic loads. For control, one group of three RC beams was left uncorroded and similarly load tested. All the RC beam specimens subjected to corrosion demonstrated a significant reduction (a maximum reduction of 55% as compared to the uncorroded control group) of their ultimate capacity. The presence of corrosion induced a transition from flexural failure to anchorage failure in some specimens; despite the induced damage some redistributed structural capacity was observed. Modelling of deterioration effects by the inclusion of different aspects of corrosion was also conducted. Three-dimensional (3D) Finite-Element Method (FEM) models were developed to assess the variation in the mechanical properties of the corroded steel and the reduction in the bond interaction between concrete and steel due to the corrosion of the steel reinforcement. In general, the current 3D FEM models demonstrated a good agreement with the experimental data; however, 3D FEM models that exhibit greater sophistication are necessary to better describe the failure mode of some RC beam specimens when they are associated with local effects.

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Section: Corroded Rc Beam Specimenssupporting

confidence: 53%

Section: Modelling Approaches For the Assessment Of Corroded Rc Strucmentioning

confidence: 99%

See 1 more Smart Citation

Ultimate Capacity of Corroded Statically Indeterminate Reinforced Concrete Members

Fernandez

Herrador

Bernat

et al. 2018

Int J Concr Struct Mater

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“…The level of detail in a structural assessment can be divided into several categories. This approach is based on the principle of successively improved evaluation in structural assessment and comprises four different assessment levels [24], level I being the simplest and level IV the most advanced. A description of the assessment levels is presented in Figure 1.…”

Section: Different Levels Of Assessmentmentioning

confidence: 99%

Engineering bond model for corroded reinforcement

Blomfors

Zandi

Lundgren

et al. 2018

Engineering Structures

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Corrosion of the reinforcement in concrete structures affects their structural capacity. This problem affects many existing concrete bridges and climate change is expected to worsen the situation in future. At the same time, assessment engineers lack simple and reliable calculation methods for assessing the structural capacity of structures damaged by corrosion. This paper further develops an existing model for assessing the anchorage capacity of corroded reinforcement. The new version is based on the local bond stress-slip relationships from fib Model Code 2010 and has been modified to account for corrosion. The model is verified against a database containing the results from nearly 500 bond tests and by comparison with an empirical model from the literature. The results show that the inherent scatter among bond tests is large, even within groups of similar confinement and corrosion level. Nevertheless, the assessment model that has been developed can represent the degradation of anchorage capacity due to corrosion reasonably well. This new development of the model is shown to represent the experimental data better than the previous version; it yields similar results to an empirical model in the literature. In contrast to many empirical models, the model developed here represents physical behaviour and shows the full local bond stress-slip relationship. Using this assessment model will increase the ability of professional engineers to estimate the anchorage capacity of corroded concrete structures.

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“…The aim of this study is to evaluate the mechanical properties of naturally corroded bars, which were extracted from a real bridge more than 35 years old. This study is part of a larger experimental campaign comprising more than 20 reinforced concrete specimens obtained from the edge beams of the Stallbacka bridge, which was built in 1981 in Sweden (Lundgren et al 2015;Tahershamsi et al 2014;Tahershamsi et al 2017). The edge beams of the bridge, which presented conspicuous rust stains, longitudinal cracking and cover spalling, all of them symptomatic of an advanced corrosion state, had to be replaced after only 30 years in service.…”

Section: Assumingmentioning

confidence: 99%

Mechanical Properties of 30 Year-Old Naturally Corroded Steel Reinforcing Bars

Fernandez

Berrocal

2019

Int J Concr Struct Mater

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The present paper investigates the mechanical response of more than 120 corroded reinforcing bars extracted from a real bridge after 30 years in service. Corrosion was quantified using gravimetric and 3D-laser scanning measurements. An expression to relate the average and critical corrosion levels was found, the latter being the main parameter governing the capacity of corroded bars. Whereas the strength of the material was not affected by corrosion, the ultimate strain decreased sharply. However, strains were not only affected by cross-sectional reduction but also by the shape of the critical pit and necking at failure.

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Four levels to assess anchorage capacity of corroded reinforcement in concrete

Cited by 13 publications

References 30 publications

Ultimate Capacity of Corroded Statically Indeterminate Reinforced Concrete Members

Ultimate Capacity of Corroded Statically Indeterminate Reinforced Concrete Members

Engineering bond model for corroded reinforcement

Mechanical Properties of 30 Year-Old Naturally Corroded Steel Reinforcing Bars

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