A simple model for the calculation of the axial load-carrying capacity of corroded RC columns

Campione, Giuseppe; Cannella, F.; Minafò, Giovanni

doi:10.1617/s11527-015-0624-4

Cited by 19 publications

(10 citation statements)

References 6 publications

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“…On the other hand, the usefulness of the proposed smart hoop can not only be limited in the area of load variation monitoring for RC columns; this detection principle and smart hoop can also be employed to evaluate the degradation phenomenon, such as the corrosion of the reinforcement 10 Advances in Civil Engineering bars in concrete columns [47][48][49]. In the next works, one of the research topics is to investigate and validate the feasibility of the proposed method in the area of the strength evaluation of deteriorated RC structures.…”

Section: Discussionmentioning

confidence: 99%

Axial Load Monitoring for Concrete Columns Using a Wearable Smart Hoop Based on the Piezoelectric Impedance Frequency Shift: A Feasibility Study

Liang

Chen

Feng

2020

Advances in Civil Engineering

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Concrete columns are critical in supporting the weight of an entire structural frame and also play a key role in force transferring among structural members. Therefore, integrity of the columns, especially their axial load bearing capacity, directly affects the stability and safety of the entire structure. In this study, a wearable smart hoop is designed to monitor the axial load of the concrete columns. The smart hoop measures the shift in impedance frequency of its integrated piezoelectric transducer and correlates the frequency to the structural state of the column. In order to validate the feasibility of the smart hoop, an experiment on two concrete columns with different dimensions is carried out. The smart hoop is installed on each column. Then, an increasing axial load was applied onto the specimen, and the admittance of the PZT patch is acquired under different load levels by using an impedance analyzer. Finally, frequencies corresponding to the peak and trough in the susceptance of the admittance signal are collected as the monitoring index to estimate the axial load variation on the specimen. The experimental results demonstrated a downward shift in frequency corresponding to an increase of axial load. The results validate the feasibility of the wearable smart hoop in monitoring axial load for concrete columns and show potential for retrofit on existing columns.

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Section: Discussionmentioning

confidence: 99%

Axial Load Monitoring for Concrete Columns Using a Wearable Smart Hoop Based on the Piezoelectric Impedance Frequency Shift: A Feasibility Study

Liang

Chen

Feng

2020

Advances in Civil Engineering

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“…When RC columns strengthened by FRCM are subjected to axial compression, the axial loads are borne by the concrete, longitudinal rebars and cementitious material of FRCM. For the RC columns whose rebars are corroded, the strength of the longitudinal rebars will be weakened [22]. According to research results proposed by Sun et al [23], the relationship between the ratio of f y * (yield strength of corroded rebars) to f y (yield strength of non-corroded rebars) and the corrosion ratio η can be expressed as follows:…”

Section: Calculation Of Ultimate Loadmentioning

confidence: 99%

Study on the Corroded Hollow Section RC Columns Strengthened by ICCP-SS System

et al. 2021

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In this paper, the behavior of corroded hollow section RC (reinforced concrete) columns strengthened by an Impressed Current Cathodic Protection and Structural Strengthening (ICCP-SS) system was investigated. The Carbon Fabric-Reinforced Cementitious Matrix (C-FRCM) composite serves dual functions in the intervention method. The axial compression behavior of strengthened columns was firstly investigated through axial compression tests. The influence of corrosion ratio and C-FRCM strengthening on the test results, such as failure mode, load–displacement curve, ultimate load, and ultimate strain, were analyzed. Test results showed that the ultimate load of the corroded specimens could be enhanced significantly by C-FRCM, and the ductility of the strengthened specimens was larger than the specimens without strengthening, especially for the specimens with higher corrosion ratios. Secondly, the effects of the ICCP-SS system on the migration and distribution laws of chloride ions (Cl−) in hollow section RC columns were analyzed by the potentiometric titration method. The main parameters include charging time, current density, and salt addition. Results showed that the rebar would have a certain blocking effect on the migration of Cl−, which resulted in that the content of Cl− in the inner side of the rebar was always larger than that of the outer side; and research results also showed that the increase of impressed current density and charge time would reduce the Cl− content on both sides of the rebar, while the impressed current would cause the Cl− near the rebars to constantly move toward the vicinity of CFRP.

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“…The cross section of a corroded RC column under axial compression can be decomposed into four different regions (Figure 3), i.e., the cracking area of unconfined concrete A 1c , cracking area of confined concrete A 2c , no cracking area of confined concrete A 3c and the longitudinal reinforcement area considering the buckling effect A 1,red [29]. The bearing capacity model and strength contribution of the areas can be expressed as…”

Section: Axial Compression Pointmentioning

confidence: 99%

“…where E p is the hardening modulus of the steel bar, E p = β 1 E s , with β 1 = 1 in the elastic range or assumed to be 0.03 at the yielding stage [29]; A all is the area of longitudinal reinforcement; E r is the elastic modulus of the corroded steel bar; E s is the elastic modulus of the steel bar; and k 1 denotes the stiffness parameter, for a corner bar, which can be calculated by…”

Section: Maximum Depth Of Pitmentioning

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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A simple model for the calculation of the axial load-carrying capacity of corroded RC columns

Cited by 19 publications

References 6 publications

Axial Load Monitoring for Concrete Columns Using a Wearable Smart Hoop Based on the Piezoelectric Impedance Frequency Shift: A Feasibility Study

Axial Load Monitoring for Concrete Columns Using a Wearable Smart Hoop Based on the Piezoelectric Impedance Frequency Shift: A Feasibility Study

Study on the Corroded Hollow Section RC Columns Strengthened by ICCP-SS System

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

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