Performance of Corroded Reinforced Concrete Columns under the Action of Eccentric Loads

Xia, Jiangwei; Jin, Weiliang; Li, Long-yuan

doi:10.1061/(asce)mt.1943-5533.0001352

Cited by 52 publications

(28 citation statements)

References 32 publications

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“…Anti-corrosive techniques to withstand chloride attack are proposed from the results. Jin Xia et al [15], study show the performance of RC columns when it is embedded with corroded steel. 6mm and 20mm hot-rolled reinforcing steel bars were used in the RC column sections.…”

Section: Literature Reviewmentioning

confidence: 99%

Condition Assessment of Existing Concrete Building Using Non-Destructive Testing Methods for Effective Repair and Restoration-A Case Study

Venkatesh

Alapati

2017

CivileJournal

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Buildings constructed during early 70's & late 80's of the last century in India are found to be in distressed conditions due to inadequate specifications and poor construction practices. The continuous monitoring of concrete structures using suitable NDT (Non Destructive Testing) methods and use of possible restoration methods help in a considerable reduction of the rate of deterioration of concrete structures thereby increasing the life span of structures. NDT methods have greater advantage in evaluating the uniformity, homogeneity, approximate compressive strength, durability, the extent of corrosion of rebars in concrete etc. of damaged structures. The objective of the present study is to enhance the life of 50 year old existing hospital building (Partly RC and Brick masonry) in Kurnool, Andhra Pradesh. Condition assessments are carried out through a visual, field and laboratory evaluation of samples collected from the structure and results are presented in this paper. The paper also highlights the assessment of strength and durability of concrete to evaluate the extent of distress and damage in the building. Besides visual inspection, the Non Destructive Evaluation covering UPV & Rebound Hammer values and Half Cell Potential with respect to the status of corrosion of reinforcing bars and chemical tests on selected undistressed RC columns, beams, and slabs are also presented and discussed. The repair and strengthening techniques using the latest materials and possible restoration works such as column jacketing, shotcreting, anticorrosive coatings, etc. have been suggested to enhance the life of the structure.

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Section: Literature Reviewmentioning

confidence: 99%

Condition Assessment of Existing Concrete Building Using Non-Destructive Testing Methods for Effective Repair and Restoration-A Case Study

Venkatesh

Alapati

2017

CivileJournal

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“…Fifty corroded RC columns from [18,19,[41][42][43] are utilized to verify the accuracy of the model. The material properties, physical dimensions, load eccentricities and bearing capacity of the fifty specimens mentioned above are given in Appendix C. The ratio of results predicted by the proposed model to experimental results is shown in Figure 6.…”

Section: Validation By Experimental Datamentioning

confidence: 99%

“…According to the different stress state of the components, the formulas for calculating the bearing capacity of corroded RC columns are segregated. For example, Xia et al [18] examined the relationships between the average cross-sectional area loss of the steel bar, the average and maximum crack widths of concrete cover, and the strength loss of the RC columns, and proposed the load-carrying capacity model of large eccentric and small eccentric columns, respectively. Li et al [19] built an analytical framework regarding the strength of a uniaxial short column considering the concrete cover spalling, reduction of concrete strength and supporting role of stirrup to longitudinal reinforcement caused by a corrosion stirrup.…”

Section: Introductionmentioning

confidence: 99%

Bearing Capacity Model of Corroded RC Eccentric Compression Columns Based on Hermite Interpolation and Fourier Fitting

Xin

Zhou

et al. 2018

Applied Sciences

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With an extension in service years, bridges inevitably suffer from performance deterioration. Columns are the main components of bridge structures, which support the superstructure. The damage of pier columns is often more harmful to bridges than that of other components. To accurately evaluate the time-varying characteristics of corroded columns, this paper proposes a new model for the bearing capacity evaluation of deteriorated reinforced concrete (RC) eccentric compression columns based on the Hermite interpolation and Fourier function. Firstly, the axial compression point, the pure bending point and the balanced failure point were selected as the basic points, and the deteriorated strength of these basic points was calculated by considering factors such as concrete cracking, reduction of reinforcement area, buckling of the steel bar, bond slip and strength reduction of confined concrete. After that, the interpolation points were generated by a piecewise cubic Hermite interpolating polynomial, and the explicit expression of the interpolation points fitting function was realized by the trigonometric Fourier series model. Finally, comparison studies based on measured data from forty-five corroded RC eccentric compression columns were conducted to investigate the accuracy and efficiency of the proposed method. The results show that: (1) the prediction results for bearing capacity of corroded RC columns are in good agreement with the measured data, with the average ratio of predicted results to test results at 1.06 and the standard deviation at 0.14; (2) the proposed model unifies the three stress states of axial compression, eccentric compression and pure bending, and is consistent with the continuum mechanics characteristics; (3) the decrements of axial load carrying capacity for 10% and 50% of the corrosion rate are 31.4% and 45.2%, while in flexure they are 25.4% and 77.4%, respectively; and (4) the test data of small-scale specimens may overestimate the negative effect of corrosion on the bearing capacity of actual structures. The findings in this paper could lay a solid starting point for structural life prediction technologies based on nondestructive testing.

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“…The decrease in strength and strain of corroded columns was mainly coming from the effect of corrosion on the section area of steel reinforcement. Xia et al [7] studied the behavior of the corroded reinforced concrete columns. The concrete columns were fabricated, corroded by combined accelerated method (electrochemical process and wetting-drying cycles), and tested under compressive load.…”

Section: Introductionmentioning

confidence: 99%

Compressive Performance of Corroded Reinforced Concrete Columns

Radhi¹,

Hassan²,

Gorgis³

2020

ETJ

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Corrosion of reinforcement has been identified as the deterioration mechanism of reinforced concrete structures, which seriously affects the safety and integrity of structures. The corrosion of the embedded reinforcing steel in concrete is a major problem facing civil engineers today, which initiates 80% of the reinforced concrete structures deterioration. This paper reveals the outcomes of an experimental investigation on the mechanical performance (residual strength) of circular steel reinforced columns which have been damaged by corrosion of the steel rebar. Small scale circular reinforced concrete columns with a diameter of 100 mm and 300 mm in height were adopted. Different rates of steel reinforcement mass loss (corrosion damage) ranged between 10%, 20% to 30 % were created in the columns by using a galvanostatic accelerated corrosion method combined with wetting-drying cycles. The uniaxial compression test was implemented for damaged columns up to failure. Based on the experimental outcomes, it was revealed that the corrosion damage had substantially reduced the performance of columns. The decrement of the load capacity of corroded columns ranged between 19% to 40% and for corrosion, level ranged from 10% to 30%, respectively. The decrement of the final deformation of corroded columns ranged between 15% to 30% and for corrosion, level ranged from 10% to 30%, respectively. Likewise, the failure mode and relationship between the stress and strain for corroded columns had been adversely affected by corrosion.

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Performance of Corroded Reinforced Concrete Columns under the Action of Eccentric Loads

Cited by 52 publications

References 32 publications

Condition Assessment of Existing Concrete Building Using Non-Destructive Testing Methods for Effective Repair and Restoration-A Case Study

Condition Assessment of Existing Concrete Building Using Non-Destructive Testing Methods for Effective Repair and Restoration-A Case Study

Bearing Capacity Model of Corroded RC Eccentric Compression Columns Based on Hermite Interpolation and Fourier Fitting

Compressive Performance of Corroded Reinforced Concrete Columns

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