The effect of corrosion on the natural frequency and modal damping of reinforced concrete beams

Razak, Hashim Abdul; Choi, Fook Choon

doi:10.1016/s0141-0296(01)00005-0

Cited by 95 publications

(68 citation statements)

References 2 publications

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“…Experimental results obtained by other authors show that reinforcement corrosion produces significant changes in the Load-carrying Capacity (static considerations) and at the same time, modal parameters are affected (natural frequencies and to a lesser extent, the damping ratio) [20].…”

Section: Introductionmentioning

confidence: 90%

Assessment of Residual Life of concrete structures affected by reinforcement corrosion

Ortega

Robles

2016

HBRC Journal

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The corrosion process in reinforced concrete structures, exposed to marine or industrial environments, causes the appearance and growth of cracks. As a consequence, this produces a slow degradation of the material physical properties, steel fragilization and a decrease of the bond strength and steel reinforcements, cross section, affecting its static and dynamic behavior.In the second half of the twentieth century, the importance of constructions' service life was noticed, so different techniques have been developed to predict the Residual Life of existing structures, in order to increase it. This situation has a significant economic impact on society.This paper presents a non-destructive technique to predict the Residual Life of reinforced concrete beams having different cracking levels, as results of steel reinforcement corrosion, considering the variation produced in the dynamic behavior, through the variation of the first natural vibration frequency.The reinforcement corrosion is an electrochemical process that can be quantified by measuring the intensity of the current on the concrete surface. In this paper, to simulate the corrosion process, a current is externally applied to the studied structure reinforcement and then crack widths and vibration natural frequencies are measured. Based on these measurements a mathematical model is proposed to predict structure remaining life. ª 2014 Production and hosting by Elsevier B.V. on behalf of Housing and Building National Research Center.

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Section: Introductionmentioning

confidence: 90%

Assessment of Residual Life of concrete structures affected by reinforcement corrosion

Ortega

Robles

2016

HBRC Journal

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“…The above-observed phenomena may verify the observed test results that the corroded reinforced concrete members have higher damping than that of un- corroded when loading force increases as stirrup is more vulnerable to corrosion. 18 …”

Section: Energy Dissipationmentioning

confidence: 99%

Experimental study of bond-slip performance of corroded reinforced concrete under cyclic loading

Zhou

et al. 2015

Advances in Mechanical Engineering

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Reinforced concrete structures exposed to marine environment often sustain high levels of chloride-induced reinforcement corrosion, which causes reinforcement corrosion and resulting in degraded performance under cyclic service loading. This article studied the dynamic bond performance between corroded reinforcing and concrete under force controlled loading. Tests were carried out to evaluate the cyclic bond-slip degradation with different reinforcement corrosion levels. A series of 30 specimens with various corrosion levels of rebar and stirrup were made. The specimen was cast as concrete cube with the dimension of 200 mm, and a steel rebar was centrally embedded with two stirrups around. The embedded steel rebar and stirrups were corroded using an electrochemical accelerated corrosion technique. The corrosion crack opening width and length were recorded after completion of artificial corrosion. Then, cyclic loading test was carried out; three different force levels of 24, 36, and 48 kN were adopted. The effects of reinforcement corrosion rate on crack opening, maximum slip, energy dissipation, and unloading stiffness were discussed in detail. It was found that both reinforcement corrosion rate and crack opening would have significant effects on cyclic bond performance. Further studies are urgently needed to quantify these effects to the cyclic bond performance.

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“…The residual life of the structure can define as the life remains after spending a certain period of structural service life. Here in this work dynamic parameter as a first natural frequency taken into consideration to analyze the behavior of structures before and after corrosion and for this beam specimens are selected (Razak & Choi, 2001). Corrosion is an electrochemical process even in a severe corrosive environment, it takes significant time to initiate and propagate.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Impact Analysis on Residual Life of Structure Using Cathodic Technique and Algor Simulation Software

Nayak

Throat

Thakare³

2018

Engineering Structures and Technologies

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Abstract. Damage to the reinforced concrete structure is mainly occurring because of two reasons either due to end of service life or due to load exceeds beyond structural capacity. Along with these two reasons degradation of material property is the one more major factor which causes the risk of failure. A concrete structure constructed in an aqueous environment get exposed to the corrosion process. Consequently, this causes the generation of crack, fragilization, a decrease of bond strength between reinforcement and concrete. All these factors affection static and dynamic behavior of concrete structure reducing the service life of an affected area. Whereas service life carries the major role in the economy of a concrete structure that is why various methods have been developed in the second half of the 20 th century to find out the residual life of the structure. In this proposed work, a non-destructive technique is used to predict the residual life of reinforced concrete beams having different cracking levels, as results of steel reinforcement corrosion, considering the variation produced in the dynamic behavior, through the variation of the first natural vibration frequency. Whereas to accelerate the corrosion process, impress current technique is used in which a current is externally applied to induce corrosion in reinforcement and then crack widths and vibration natural frequencies were measured. A numerical model is proposed with the help of FEM based Auto desk Algor simulation software to predict attack penetration depth. At the end, the paper is concluded by giving an effect of "water to cement ratio" and "cover to diameter ratio" on the initiation and propagation of corrosion and residual life of corroded beam specimen is graphically represented.

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The effect of corrosion on the natural frequency and modal damping of reinforced concrete beams

Cited by 95 publications

References 2 publications

Assessment of Residual Life of concrete structures affected by reinforcement corrosion

Assessment of Residual Life of concrete structures affected by reinforcement corrosion

Experimental study of bond-slip performance of corroded reinforced concrete under cyclic loading

Corrosion Impact Analysis on Residual Life of Structure Using Cathodic Technique and Algor Simulation Software

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