The Behaviour of Rc Beams Damaged by Corrosion of Reinforcement

Tachibana, Yoshihiro; Kajikawa, Yasuo; Kawamura, Mitsunori

doi:10.2208/jscej.1989.402_105

Cited by 27 publications

(33 citation statements)

References 10 publications

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“…Over the past decades a number of experimental investigations have been conducted to study the effect of corrosion on both performance and cracking of concrete structures [2][3][4][5][6][7][8][9][10][11][12][13][14]. In these investigations, the corrosion of a steel bar in the concrete was reproduced artificially either by applying an internal pressure or conducting accelerated corrosion tests.…”

Section: Introductionmentioning

confidence: 99%

Finite element analysis of cracking and delamination of concrete beam due to steel corrosion

Chan

Clark

et al. 2013

Engineering Structures

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Section: Introductionmentioning

confidence: 99%

Finite element analysis of cracking and delamination of concrete beam due to steel corrosion

Chan

Clark

et al. 2013

Engineering Structures

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“…Although wholly corroded RC beams were reported to lead to a degradation of shear capacity (Tachibana et al 1990;Kawamura et al 1995) and pre-existing cracking around the main reinforcement in cases 1, 3, 4 also promotes shear crack propagation, partial damage resulted in a slightly diminished shear capacity. One concern was the state of the anchorage zones, which were kept undamaged without any pre-cracking outside of the shear spans.…”

Section: Shear Capacity and Stiffnessmentioning

confidence: 99%

“…The literature also reports that corrosion of reinforcement affects the shear capacity, and some experiments show that the loss of bond through corrosion elevates the shear capacity (Satoh et al 2003, Takewaka et al 1984. However, other investigations state that the shear capacity and ductility of the corroded RC are deteriorated (Tachibana et al 1990;Kawamura et al 1995). The effect of steel corrosion of the main reinforcement on an RC member's shear capacity is now recognized on a case-by-case basis.…”

Section: Introductionmentioning

confidence: 98%

Interaction of Pre-Induced Damages along Main Reinforcement and Diagonal Shear in RC Members

Toongoenthong

Maekawa

2004

ACT

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The mechanical interaction of pre-induced damage and diagonal shear was investigated with regard to corrosion cracks in concrete and rupture of the web reinforcement along the main reinforcement. First, localized corrosion cracking was produced in concrete around the mid-span of beams in both compression and tension fibers, and a mechanical interaction was no longer identified. Next, cracking occurred near the beam supports inside a shear span and around the anchorage zones of longitudinal steel. A diagonal shear crack was observed to meet the pre-existing cracking around the anchorage zones of longitudinal steel. Crack propagation into the anchorage zones resulted in significant decline in the overall capacity. On the other hand, the overall capacity could be maintained or even increased by keeping anchorage failure from occurring. Finally, RC beams with artificial defects in both concrete and web reinforcement over the whole shear span were tested. Damage around anchorage zones was concluded to play a critical role in triggering shear sliding failure in pre-damaged reinforced concrete.

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“…Assessment of the flexural strength of corrosion-damaged RC members has been studied (Azad et al 2010;Cabrera 1996;Huang and Yang 1997;Rodriguez et al 1997;Uomoto and Misra 1988). A number of studies have also been conducted on the prediction of residual flexural strength of corroding concrete beams (Azad et al 2007;Mangat and Elgarf 1999;Nokhasteh and Eyre 1992;Ravindrarajah and Ong 1987;Tachibana et al 1990;Wang and Liu 2008;Jin and Zhao 2001). Some of these studies had been conducted in the laboratory.…”

Section: Introductionmentioning

confidence: 99%

“…Some of these studies had been conducted in the laboratory. They involve the casting of concrete beam specimens sometimes in large scale, in the order of meters in dimension (Ou et al 2012), and sometimes in small scale, in the order of millimeters (Azad et al 2007;Mangat and Elgarf 1999;Nokhasteh and Eyre 1992;Revathy et al 2009;Tachibana et al 1990;Wang and Liu 2008;Jin and Zhao 2001). The specimens are then subjected to various degrees of corrosion damage after which the samples are tested for their bending or flexural performances.…”

Section: Introductionmentioning

confidence: 99%

Residual Strength of Corroded Reinforced Concrete Beams Using an Adaptive Model Based on ANN

Imam

Anifowose

Azad

2015

International Journal of Concrete Structures and Materials

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Estimation of the residual strength of corroded reinforced concrete beams has been studied from experimental and theoretical perspectives. The former is arduous as it involves casting beams of various sizes, which are then subjected to various degrees of corrosion damage. The latter are static; hence cannot be generalized as new coefficients need to be re-generated for new cases. This calls for dynamic models that are adaptive to new cases and offer efficient generalization capability. Computational intelligence techniques have been applied in Construction Engineering modeling problems. However, these techniques have not been adequately applied to the problem addressed in this paper. This study extends the empirical model proposed by Azad et al. (Mag Concr Res 62(6):405-414, 2010), which considered all the adverse effects of corrosion on steel. We proposed four artificial neural networks (ANN) models to predict the residual flexural strength of corroded RC beams using the same data from Azad et al. (2010). We employed two modes of prediction: through the correction factor (C f ) and through the residual strength (M res ). For each mode, we studied the effect of fixed and random data stratification on the performance of the models. The results of the ANN models were found to be in good agreement with experimental values. When compared with the results of Azad et al. (2010), the ANN model with randomized data stratification gave a C f -based prediction with up to 49 % improvement in correlation coefficient and 92 % error reduction. This confirms the reliability of ANN over the empirical models.

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The Behaviour of Rc Beams Damaged by Corrosion of Reinforcement

Cited by 27 publications

References 10 publications

Finite element analysis of cracking and delamination of concrete beam due to steel corrosion

Finite element analysis of cracking and delamination of concrete beam due to steel corrosion

Interaction of Pre-Induced Damages along Main Reinforcement and Diagonal Shear in RC Members

Residual Strength of Corroded Reinforced Concrete Beams Using an Adaptive Model Based on ANN

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