Experimental Study on Shear Capacity of Reinforced Concrete Beams with Corroded Longitudinal Reinforcement

Han, Sekyung; Joo, Hyo-Eun; Choi, Sung Mo; Heo, Inwook; Kim, Kang Su; Seo, Soo-Yeon

doi:10.3390/ma12050837

Cited by 12 publications

(6 citation statements)

References 30 publications

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“…Only the analysis and design of B-regions can proceed on a sectional basis for which plane sections remain plane, whereas the analysis and design of D-regions must proceed on a regional basis. Some of the many references are [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ].…”

Section: Statement Of the Issue Being Addressedmentioning

confidence: 99%

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Strengthening of Reinforced Concrete Beams Subjected to Concentrated Loads Using Externally Bonded Fiber Composite Materials

Foraboschi

2022

Materials

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Renovation, restoration, remodeling, refurbishment, and the retrofitting of buildings often imply applying forces (i.e., concentrated loads) to beams that before were subjected to distributed loads only. In the case of reinforced concrete structures, the new condition causes a beam to bear a concentrated load with the crack pattern that resulted from the distributed loads which had acted before. If the concentrated load is applied at or near the beam’s midspan, the new shear demand reaches the maximum where cracks are vertical or quasi-vertical, and where inclined bars are not common according to any standards. So, the actual shear capacity can be substantially lower than new shear demand due to the concentrated load. This paper focuses on reinforced concrete beams whose load distribution has to be changed from distributed to concentrated and presents a design method to bring the beam’s shear capacity up to the new demand. The method consists of applying fiber composites (fiber-reinforced polymers or fiber-reinforced cementitious material) with fibers at an angle of 45° bonded to the beam’s web. This kind of external reinforcement arrangement has to comply with some practical measures, which are presented as well. The paper also provides the analytical model that predicts the concentrated load-carrying capacity of a beam in the strengthened state. The model accounts for the crack’s verticality, which nullifies the contributions of steel stirrups, aggregate interlock, and dowel action, and for the effective bond length of each fiber, which depends on the distance between the ends of the fiber and the crack it crosses.

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Section: Statement Of the Issue Being Addressedmentioning

confidence: 99%

“…Neither the fact that the pin-joined truss analogy does not hold true, nor the absence of web reinforcement automatically entails that an RC beam fails by shear [ 9 , 11 , 12 , 13 , 22 , 29 , 30 , 31 , 32 , 33 , 39 , 44 ]. It depends on which internal action will initiate cracking.…”

Section: Statement Of the Issue Being Addressedmentioning

confidence: 99%

Strengthening of Reinforced Concrete Beams Subjected to Concentrated Loads Using Externally Bonded Fiber Composite Materials

Foraboschi

2022

Materials

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“…where N is the required axial strength, N; N Ex is the parameter according to Equation 4; ϕ is the stability reduction coefficient of concentrically loaded member; A is the gross cross-sectional area, mm 2 ; β is the equivalent moment factor; M is the required moment strength, N•mm; γ m is the plastic adaption coefficient; and W is the gross section modulus, mm 3…”

Section: Comparison Calculations Of Load Carrying Capacitymentioning

confidence: 99%

“…Among them, the research on corroded reinforced concrete structures began earlier, and a lot of related experimental studies and theoretical analyses have been performed. Han et al [3] investigated the effects of longitudinal reinforcement corrosion on the shear capacity of RC members with transverse reinforcement. Triantafyllou et al [4,5] studied the mechanical behavior of reinforced concrete beams with corroded steel reinforcement and corroded RC beams were strengthened with cement-based repair patch and externally bonded reinforcement or near surface mounted fiber-reinforced polymer laminates.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of Circular Steel Tubular Beam-Columns Corroded Uniformly in Atmospheric Environment

Wei

Wang

et al. 2020

Applied Sciences

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Circular steel tube members with the absence of anticorrosive protection or coating failure are prone to uniform corrosion, which threatens the reliability and safety of members in the atmospheric environment. To fully study the mechanical behavior of uniformly corroded circular steel tubes, compression test and theoretical analysis were conducted, and two methods considering section reduction and material degradation, respectively, were adopted for the calculation of ultimate load carrying capacities of specimens. The results indicate that uniform corrosion did not change the failure modes of specimens, and all of them belonged to global buckling failure. The load carrying capacities and stiffness of specimens decreased with the increase of corrosion ratio, and the degree of reduction was greater than that of material degradation, showing a linear relationship with the corrosion rate. Under the same corrosion ratio, the specimens with larger eccentricity represented more obvious load carrying capacity and stiffness degradation. The load carrying capacities predicted by both methods were in good agreement with the test results and had a certain safety margin. The conservative degree of calculation results from three specifications followed a descending order of ANSI/AISC 360-16, GB 50017-2017, and EN 1993-1-1. Under the same corrosion ratio, the load carrying capacity variation of specimens between one-sided corrosion and two-sided corrosion was less than 3%.

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“…Many coastal cities have begun to utilize sea sand as a construction material [1]. Chloride ions contained in marine aggregates pose a great threat to steel bars within concrete by destroying integrality of the steel bars’ passive film, resulting in corrosion of the steel bars and a significant reduction of service life of the structure [2,3,4,5,6].…”

Section: Introductionmentioning

confidence: 99%

Size Distribution Model and Development Characteristics of Corrosion Pits in Concrete under Two Curing Methods

Xue-zhong

et al. 2019

Materials

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In this paper, the effect of chloride ions on the development of corrosion pits in different reinforced concrete under different environmental conditions is studied. A fitting model for the size distribution of pits in seawater and sea-sand concrete (SSC) under different curing modes is established, and time-dependent fractal features are examined. Under wet/dry chloride cycles, the weight loss rate and corrosion rate of steel bars are higher, and the number of corrosion pits appears to increase on a small scale within 60-day. A majority of the corrosion is metastable pitting, and we propose a model to describe the size distribution of pitting in different periods. The good agreement between the proposed model and the available data illustrates that the proposed model is reliable and accurate. Macroscopic pitting occurs first in wet/dry chloride cycles. With the increase of concrete age, the size distribution of pits under wet/dry chloride cycles is uneven, and the pit sizes in submerged concrete tend to be equal.

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Experimental Study on Shear Capacity of Reinforced Concrete Beams with Corroded Longitudinal Reinforcement

Cited by 12 publications

References 30 publications

Strengthening of Reinforced Concrete Beams Subjected to Concentrated Loads Using Externally Bonded Fiber Composite Materials

Strengthening of Reinforced Concrete Beams Subjected to Concentrated Loads Using Externally Bonded Fiber Composite Materials

Mechanical Behavior of Circular Steel Tubular Beam-Columns Corroded Uniformly in Atmospheric Environment

Size Distribution Model and Development Characteristics of Corrosion Pits in Concrete under Two Curing Methods

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