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Nonlinear stress–strain behaviour of corrosion-damaged reinforcing bars including inelastic buckling

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Title: Nonlinear stress–strain behaviour of corrosion-damaged reinforcing bars including inelastic buckling
Authors: Kashani, Mohammad M. mehdi.kashani@bristol.ac.uk, Crewe, Adam J.1, Alexander, Nicholas A.1
Source: Engineering Structures. Mar2013, Vol. 48, p417-429. 13p.
Subjects: Earthquake resistant design, Strains & stresses (Mechanics), Corrosion & anti-corrosives, Fracture mechanics, Reinforcing bars, Elasticity, Nonlinear analysis
Abstract: Abstract: In the seismic design and assessment of reinforced concrete structures in earthquake zones buckling of longitudinal reinforcement in plastic hinge regions is an important limit state that needs to be considered. If the structure is located in an environmentally aggressive area, it is also subject to material deterioration over its service life. Corrosion of reinforcement is the most common type of deterioration of reinforced concrete (RC) structures and bridges. In this paper the nonlinear stress–strain behaviour of corroded reinforcing bars has been investigated by extensive experimental testing. The effect of different corrosion levels on the tension and compression behaviour of bars with different slenderness ratios is presented. The results of this study show that a corrosion level above 15% mass loss significantly affects the ductility and plastic deformation of reinforcement in tension and that corrosion changes the buckling collapse mechanism of the bars in compression. The results of buckling tests show that 10% mass loss produces about a 20% reduction in the buckling capacity of corroded bars. The results also show that the distribution of corrosion pits along the length of corroded bars is the most important parameter affecting the stress–strain response in both tension and compression. Furthermore, a constitutive material model to predict the post-yield buckling behaviour of high-strength steel without a yield plateau is also developed. The proposed analytical model is based on Dhakal–Maekawa buckling model. The analytical model has been validated against experimental tests on uncorroded and corroded bars. The results of this corrosion extended buckling model show a good agreement with the physical testing. [Copyright &y& Elsevier]
Copyright of Engineering Structures is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
FullText Text:
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DbLabel: Engineering Source
An: 85419896
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Nonlinear stress–strain behaviour of corrosion-damaged reinforcing bars including inelastic buckling
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  Data: <searchLink fieldCode="AR" term="%22Kashani%2C+Mohammad+M%2E%22">Kashani, Mohammad M.</searchLink><i> mehdi.kashani@bristol.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Crewe%2C+Adam+J%2E%22">Crewe, Adam J.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Alexander%2C+Nicholas+A%2E%22">Alexander, Nicholas A.</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Engineering+Structures%22">Engineering Structures</searchLink>. Mar2013, Vol. 48, p417-429. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Earthquake+resistant+design%22">Earthquake resistant design</searchLink><br /><searchLink fieldCode="DE" term="%22Strains+%26+stresses+%28Mechanics%29%22">Strains & stresses (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Corrosion+%26+anti-corrosives%22">Corrosion & anti-corrosives</searchLink><br /><searchLink fieldCode="DE" term="%22Fracture+mechanics%22">Fracture mechanics</searchLink><br /><searchLink fieldCode="DE" term="%22Reinforcing+bars%22">Reinforcing bars</searchLink><br /><searchLink fieldCode="DE" term="%22Elasticity%22">Elasticity</searchLink><br /><searchLink fieldCode="DE" term="%22Nonlinear+analysis%22">Nonlinear analysis</searchLink>
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  Data: Abstract: In the seismic design and assessment of reinforced concrete structures in earthquake zones buckling of longitudinal reinforcement in plastic hinge regions is an important limit state that needs to be considered. If the structure is located in an environmentally aggressive area, it is also subject to material deterioration over its service life. Corrosion of reinforcement is the most common type of deterioration of reinforced concrete (RC) structures and bridges. In this paper the nonlinear stress–strain behaviour of corroded reinforcing bars has been investigated by extensive experimental testing. The effect of different corrosion levels on the tension and compression behaviour of bars with different slenderness ratios is presented. The results of this study show that a corrosion level above 15% mass loss significantly affects the ductility and plastic deformation of reinforcement in tension and that corrosion changes the buckling collapse mechanism of the bars in compression. The results of buckling tests show that 10% mass loss produces about a 20% reduction in the buckling capacity of corroded bars. The results also show that the distribution of corrosion pits along the length of corroded bars is the most important parameter affecting the stress–strain response in both tension and compression. Furthermore, a constitutive material model to predict the post-yield buckling behaviour of high-strength steel without a yield plateau is also developed. The proposed analytical model is based on Dhakal–Maekawa buckling model. The analytical model has been validated against experimental tests on uncorroded and corroded bars. The results of this corrosion extended buckling model show a good agreement with the physical testing. [Copyright &y& Elsevier]
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  Data: <i>Copyright of Engineering Structures is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.engstruct.2012.09.034
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        Text: English
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        PageCount: 13
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      – SubjectFull: Strains & stresses (Mechanics)
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      – SubjectFull: Corrosion & anti-corrosives
        Type: general
      – SubjectFull: Fracture mechanics
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      – SubjectFull: Reinforcing bars
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      – SubjectFull: Elasticity
        Type: general
      – SubjectFull: Nonlinear analysis
        Type: general
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      – TitleFull: Nonlinear stress–strain behaviour of corrosion-damaged reinforcing bars including inelastic buckling
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            NameFull: Kashani, Mohammad M.
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            NameFull: Crewe, Adam J.
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              Text: Mar2013
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              Y: 2013
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