Comparative Nonlinear Behavior of Corroded Circular and Square RC Columns

Mohammed, Ahmed Mohammed Youssef; Ahmed, Ali; Maekawa, Koichi

doi:10.1007/s12205-020-1730-6

Cited by 5 publications

(3 citation statements)

References 8 publications

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“…DIANA, an FE program, has also been used to simulate corroded RC beams without considering the non-uniformity of corrosion distributions [17]. COM3D, a three-dimensional (3D) FE program developed by The University of Tokyo, has been widely used to simulate the nonlinear performance of RC members, including beams, columns, piles, bridges, culverts, and composite members [18][19][20][21][22][23]. COM3D has also been adopted to simulate the performance of corroded RC columns [24,25] with average corrosion as the input and the corroded RC beams with non-linear corrosion distributions [8].…”

Section: Introductionmentioning

confidence: 99%

Behavioral characteristics of RC beams with non-uniform corrosion along the reinforcement

Zhu,

Abe,

Hayashi

et al. 2023

Journal of Intelligent Construction

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Keywordsnon-uniform corrosion reinforced concrete (RC) beams corrosion model spatial variability factor (R') diameter-loss measurement mass-loss measurementThis study investigated the behavior of a non-corroded reinforced concrete (RC) beam and two RC beams with non-uniform corrosion (whole span and side span) in a four-point bending test. The corrosion distributions of the tensile steel rebars were measured by two methods: diameter loss and mass loss. The peak values of corrosion distribution in the diameter-loss measurements were much greater than those in the mass-loss measurements. However, the average corrosion according to the diameter measurements was smaller than that in the mass-loss measurements. The corrosion distribution trends were the same in the two methods, indicating good measurement accuracy. From the bending test results, it appears that increasing corrosion area and corrosion ratios reduce the beams' stiffness, yielding capacity, and ultimate capacity. All three specimens had similar failure patterns: steel yielding followed by compression failure of the concrete. A nonlinear three-dimensional (3D) analysis model that considered the non-uniform corrosion of the rebars was established and verified by experimental data. The model's predictions for stiffness, ultimate capacity, and failure patterns were consistent with experimental results. The spatial variability factor (R'), which is the ratio of the maximum corrosion ratio (γ max ) to the average corrosion ratio (γ ave ), was adopted to quantify the nonuniformity of the corrosion distribution in this study.

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Section: Introductionmentioning

confidence: 99%

Behavioral characteristics of RC beams with non-uniform corrosion along the reinforcement

Zhu,

Abe,

Hayashi

et al. 2023

Journal of Intelligent Construction

View full text Add to dashboard Cite

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“…Kasetni et al (2016) [15] presented a FEM that simulates the nonlinear performance of a corroded RC fiber beam-column member. Mohammed et al (2020) [16] discussed the behavior of corroded RC elements using numerical analysis. Khalid (2018) [17] conducted a numerical analysis using the axial ABAQUS-3D model to simulate deteriorated columns and found that the FEM findings were compatible with the experimental outcomes.…”

Section: Introductionmentioning

confidence: 99%

Performance of Isolated Footing with Several Corrosion Levels under Axial Loading

2023

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This research aims to illustrate the corrosion process and its effect on the deterioration of reinforced concrete (RC) isolated footings using a small-scale model (1/8) and present the results of a prototype-scale study using a numerical model with different concrete depths and corrosion levels under axial load. The experimental program consisted of testing five small-scale (1/8) model RC isolated footings under axial loading after subjecting them to accelerated corrosion tests with a constant current. The main variable in the small-scale sample test was the corrosion level. This study presents an experimental approach, using the constant current method and the finite element method (FEM) with the ABAQUS package, to examine its effect on the axial load behavior under different corrosion ratios, which were 0%, 4.21%, 9.11%, 24.56%, and 30.67%. On the prototype scale, the variables were the corrosion level and the RC depths of 300 mm, 400 mm, and 500 mm. The results indicated that the average deviation in ultimate load between the experimental and FEM outcomes for the small-scale was below 5.6%, while the average deflection deviation was 6.8%. Also, the study found that an increase in the depth of the RC footing and corrosion ratio led to a more pronounced impact of the cracking pattern in the concrete and corroded bars, as well as a greater difference in the failure load. The experimental results suggest that the proposed numerical model is accurate and effective. These findings have important implications for the evaluation of isolated footings affected by corrosion damage using FEM, and can help inform decisions related to their design and maintenance. The failure loads of non-corroded footings with different depths were compared with the ECP-203 provisions of the 2018 Egyptian Code, and how corrosion ratios can be simulated by numerical models. The percentage variation between the design loads by code and the numerical loads by ABAQUS for controlled footings with thicknesses of 300, 400, and 500 mm was found to be 73%, 80%, and 78%, respectively. Using the derived relationship, the equivalent corrosion ratio percentages were 23.8%, 20.2%, and 32%, respectively. Doi: 10.28991/CEJ-2023-09-06-011 Full Text: PDF

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“…The deflection and load bearing capacity of both shapes was comparable. The comparison was carried out for different reinforcement patterns [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Performance Comparison of High Strength Reinforced Concrete Circular and Square Columns Subjected to Flexural Controlled Cyclic Loading

2021

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In existing design practices selection of circular or square column shape mostly depends upon architectural needs rather than structural behavior. The behavior of equivalent area (circular and square), high strength reinforced concrete columns is reported to be same under monotonic loading conditions but their behavior under fatigue loading is not well-established. This paper presents the comparison of high strength reinforced concrete circular and square equivalent area columns’ performance (load-deflection behavior) under fatigue loading. Columns were casted in four configurations: square and circular shapes and with and without shear stirrups. Experimental results showed that in case of columns without shear stirrups, the square column resisted 38% more loading cycles as compared to circular column while the maximum deflection was 78% more than the circular column. Similarly, in case of columns with shear stirrups, square shaped column resisted 55% more loading cycles with only 5% more maximum deflections as compared to circular column. The results show that the square columns might be considered more ductile as compared to circular columns under the application of cyclic loading conditions like wind forces or seismic forces. Therefore, it might be concluded that square columns should be recommended for highly seismic regions as compared to circular columns with equivalent area. Doi: 10.28991/cej-2021-03091639 Full Text: PDF

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Comparative Nonlinear Behavior of Corroded Circular and Square RC Columns

Cited by 5 publications

References 8 publications

Behavioral characteristics of RC beams with non-uniform corrosion along the reinforcement

Behavioral characteristics of RC beams with non-uniform corrosion along the reinforcement

Performance of Isolated Footing with Several Corrosion Levels under Axial Loading

Performance Comparison of High Strength Reinforced Concrete Circular and Square Columns Subjected to Flexural Controlled Cyclic Loading

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