Influence of Corrosion and Fatigue on the Bending Performances of Damaged Concrete Beams

He, Shanying; Cao, Zeyang; Ma, Jiajun; Zeng, Shuai; Li, Pengfei; Wang, Hui

doi:10.1155/2021/6693224

Cited by 8 publications

(3 citation statements)

References 36 publications

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“…The publications in this field mainly cover the issues of load capacity of reinforced concrete structural members under bending. In addition to the works discussed above, the studies of Li et al [17] and He et al [18] should be noted as it devoted to the bearing capacity of reinforced concrete beams subject to corrosion. Thus, the assessment of the resistance of compressed members is a complex problem, which includes the influence of the second order effects, changes in stiffness and force eccentricity over time due to the accumulation of corrosion damage.…”

Section: Introductionmentioning

confidence: 99%

Exposure of the load capacity of the RC structural system under corrosion damage to columns

Kolchunov

Savin

2023

J Appl Eng Science

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A number of accidents, such as the partial collapse of a residential building in Surfside on June 24, 2021, or the collapse of the roof structure of Basmanny Market in Moscow on February 23, 2006, show that aggressive medium impacts on reinforced concrete structures lead over time to a decrease in their strength resistance resource under accidental impacts. At the same time, the investigations in this field mainly deal with structural members under bending, while eccentrically compressed and corroded reinforced concrete members have been considered either in particular aspects or the obtained solutions are rather complicated for their practical application. In this regard, the purpose of the article was to assess the influence of the corroded depth on the load capacity of eccentrically compressed reinforced concrete columns of structural frames, as well as to predict the time of exhaustion of their load capacity under constant serviceable loads. The paper adopted the phenomenological model of V.M. Bondarenko to take into account long-term corrosion processes. It had been established that an increase in the corroded depth leads to a decrease in the load capacity of eccentrically compressed reinforced concrete members due to a decrease in the effective cross-sectional depth and effective slenderness ratio. The relative depth of the destroyed concrete varies depending on the current stress-strain state of the structural member. The time to reach the critical corroded depth depends significantly on the parameters of aggressive medium and the stress-strain state of the structural member and may differ by several times when implementing avalanche or descending damage kinetics.

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Section: Introductionmentioning

confidence: 99%

Exposure of the load capacity of the RC structural system under corrosion damage to columns

Kolchunov

Savin

2023

J Appl Eng Science

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“…An important issue investigated by the authors is the reliability and durability of corrosion-damaged structures. For example, 2 of 17 in [4], an aspect of this problem is considered under cyclic loading that causes fatigue failure. It is found that corrosion is the cause of acceleration and development of fatigue cracks.…”

Section: Introductionmentioning

confidence: 99%

The Bearing Capacity of Compressed Corrosion-Damaged Reinforced Concrete Elements under Lateral Pulse Loading

Tamrazyan

2023

Buildings

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This article addresses the relevant problem of the stress–strain behavior of compressed reinforced concrete columns under lateral pulse loading. A simplified engineering method of analyzing the limit value of lateral pulse loading P, depending on longitudinal force N acting on the column, is developed. The proposed method involves the construction of the P-N curve that has three portions. Portion 1 describes the plastic deformation of concrete and rebars of that part of the structure that is mostly in bending. Portion 2 describes the state of the column that can trigger the brittle failure of the concrete along the normal section, and Portion 3 describes the high compression of the column that predominantly triggers its shear failure. For Portions 1 and 2, analytical relationships are obtained using equilibrium equations. Corrosive damage is taken into account in the analytical model as a reduction in the strength and deformability characteristics of the material. A conventional local corrosion spot can be considered; it can be located both in and outside of the area of action of lateral pulse loading. The results obtained using the proposed model were compared with the results of numerical studies and a full-scale experiment. As a result of testing the developed engineering technique, it was found that it provides a safety margin for corrosion-damaged elements of 0.20–0.8 of the ultimate value of horizontal impulse at operational values of compressive force. The spot corrosion damage considered in the paper leads to a 10–60% strength reduction in compressed columns, depending on their location.

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“…Thus, national and foreign scientists study bearing capacity of corroded elements under dynamic multivariant loads [1][2][3], modeling of corrosion propagation [4][5], the effects from loss of bond between reinforcement and concrete are studied [6][7]. Special attention is paid to corrosion of reinforcement and [8][9] and to the phenomena of pressure of corrosion products on concrete which accompany this process, as well as to corrosion of concrete separately and its influence on the bearing capacity of elements [10]. However, insufficient attention is paid to the deformability of corroded elements.…”

Section: Introductionmentioning

confidence: 99%

Analytical Model for Assessment of Deflections of Corrosion-Damaged Reinforced Concrete Beams

Alekseytsev

Kurchenko

2022

Advances in Transdisciplinary Engineering

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Alternative approaches to the estimation of corrosion-damaged beams stiffness with regard for localization of corrosion focus and distribution of corrosion damages in concrete on the basis of layered model are considered. The following methods of determining displacements in corrosion-damaged reinforced concrete beams of rectangular cross-section have been considered. In the first one, the stiffness of the beam in determining the deflection is considered constant. In this case, the corrosion-damaged deflections values may be underestimated due to failure to take into account the actual work of reinforced concrete. In the second, the deflection is calculated considering the height of the concrete compression zone that varies along the length of the beam. For these approaches, stiffness reduction in the beam sections in the presence of corrosion damage to the concrete of the compressed zone is modeled. It is shown that in the presence of corrosion damage, the deflections of the structure can significantly increase, which requires mandatory consideration in the life cycle of load-bearing structures of structures when assessing their mechanical safety. The necessity of obligatory registration of corrosion damages in the implementation of algorithms of optimal design of reinforced concrete structures has been revealed.

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Influence of Corrosion and Fatigue on the Bending Performances of Damaged Concrete Beams

Cited by 8 publications

References 36 publications

Exposure of the load capacity of the RC structural system under corrosion damage to columns

Exposure of the load capacity of the RC structural system under corrosion damage to columns

The Bearing Capacity of Compressed Corrosion-Damaged Reinforced Concrete Elements under Lateral Pulse Loading

Analytical Model for Assessment of Deflections of Corrosion-Damaged Reinforced Concrete Beams

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