New Model for Estimating the Time-Variant Seismic Performance of Corroding RC Bridge Columns

Guo, Yisen; Trejo, David; Yim, Solomon C.

doi:10.1061/(asce)st.1943-541x.0001145

Cited by 37 publications

(24 citation statements)

References 32 publications

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“…The chloride-induced corrosion of reinforcement bars is considered as one of the dominant causes of the deterioration of reinforced concrete (RC) structures [1][2][3]. In view of its close relation to the service performance and residual life of in-service RC structure [4], it has drawn intensified study from a number of researchers.…”

Section: Introductionmentioning

confidence: 99%

Modelling of Corrosion-Induced Concrete Cover Cracking Due to Chloride Attacking

et al. 2021

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The premature failure of reinforced concrete (RC) structures is significantly affected by chloride-induced corrosion of reinforcing steel. Although researchers have achieved many outstanding results in the structural capacity of RC structures in the past few decades, the topic of service life has gradually attracted researchers’ attention. In this work, based on the stress intensity, two models are developed to predict the threshold expansive pressure, corrosion rate and cover cracking time of the corrosion-induced cracking process for RC structures. Specifically, in the proposed models, both the influence of initial defects and modified corrosion current density are taken into account. The results given by these models are in a good agreement with practical experience and laboratory studies, and the influence of each parameter on cover cracking is analyzed. In addition, considering the uncertainty existing in the deterioration process of RC structures, a methodology based on the third-moment method in regard to the stochastic process is proposed, which is able to evaluate the cracking risk of RC structures quantitatively and predict their service life. This method provides a good means to solve relevant problems and can prolong the service life of concrete infrastructures subjected to corrosion by applying timely inspection and repairs.

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Section: Introductionmentioning

confidence: 99%

Modelling of Corrosion-Induced Concrete Cover Cracking Due to Chloride Attacking

et al. 2021

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“…The seismic capacity limit states of deteriorating RC substructures under chloride attack inevitably change with time. However, current studies (Alipour et al, 2011; Decò and Frangopol, 2013; Dong et al, 2013; Guo et al, 2014, 2015) tend to assume that the seismic capacity is invariant over time in fragility analysis for simplicity. To address this issue, this paper presents a probabilistic method to provide seismic capacity estimates of deteriorating RC substructures by considering different sources of uncertainties.…”

Section: Improved Time-dependent Fragility Estimates Of Deterioratingmentioning

confidence: 99%

“…For RC bridge substructures under chloride attack, due to the inevitable deterioration, the seismic demand and capacity vary with time, eventually leading to variation in the seismic damage state or failure probability. However, almost all existing literature (Alipour et al, 2011; Dong et al, 2013; Guo et al, 2014, 2015; Decò and Frangopol, 2013) concentrating on the time-dependent fragility analysis of RC bridge substructures considers only the effect of corrosion-induced deterioration on seismic demand, and little emphasis is placed on the study of seismic capacity reduction in corroding RC substructures. For simplicity, these studies assume that the seismic capacity of RC substructures takes a constant value that is the same as that of the pristine structural state.…”

Section: Introductionmentioning

confidence: 99%

Improved time-dependent seismic fragility estimates for deteriorating RC bridge substructures exposed to chloride attack

Cui

Dong

et al. 2020

Advances in Structural Engineering

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RC bridge substructures exposed to chloride environments inevitably suffer from corrosion of reinforcement embodied in concrete. This deterioration issue leads to the loss of reinforcement areas and a reduction in seismic capacity of reinforced concrete (RC) bridge substructures. To quantify the effect of steel corrosion on seismic fragility estimates, this paper proposes an improved time-dependent seismic fragility framework by taking into account the increase in the corrosion rate after concrete cracking and the reduction in seismic capacity of RC bridge substructures during the service life. Additionally, an analytical method based on a back propagation artificial neural network (BP-ANN) is proposed to provide probabilistic capacity estimates of deteriorating RC substructures. A three-span T-shaped girder bridge is selected as a case study bridge to provide improved time-dependent seismic fragility estimates that consider uncertainties in the material properties, geometric parameters, deterioration process and ground motions. The obtained fragility curves show that there is a nonlinear increase in the exceedance probability of deteriorating RC bridge substructures for different damage states during the service life. In addition, time-dependent seismic fragility analysis shows that the cases of considering only the effect of an increase in seismic demand or the reduction in seismic capacity as well as neither of them may lead to a significant underestimation of the seismic vulnerability of deteriorating RC bridge substructures.

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“…To assess the eight empirical models, a comparison of the models reported in the literature with the experimental data from Liu (1996) is performed. Figure 3 shows the percent error for each model, calculated as follows (Guo et al, 2015) Error…”

Section: Verification Of New Empirical Modelsmentioning

confidence: 99%

“…Currently, there are several empirical models for predicting the rate of chloride-induced corrosion of steel reinforcement in RC structures (Ahmad and Bhattacharjee, 2000; Andrade et al, 1993; CECS220, 2007; Guo et al, 2015; Jung et al, 2003; Kong et al, 2006; Li, 2004a, 2004b; Liu and Weyers, 1998; Lu et al, 2008; Morinaga, 1988; Pour-Ghaz et al, 2009; Rodriguez, 1996; Vu and Stewart, 2000; Yalcyn and Ergun, 1996). In general, these models show good agreement with some experimental results, especially with the test results used for their models’ development.…”

Section: Introductionmentioning

confidence: 99%

Empirical model of corrosion rate for steel reinforced concrete structures in chloride-laden environments

Lun

et al. 2018

Advances in Structural Engineering

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The corrosion rate of reinforcing steel is an important factor to determine the corrosion propagation of reinforced concrete structures in the chloride-laden environments. Since the corrosion rate of reinforcing steel is affected by several coupled parameters, the efficient prediction of which remains challenging. In this study, a total of 156 experimental data on corrosion rate from the literature were collected and compared. Seven empirical models for predicting the corrosion rate were reviewed and investigated using the collected experimental data. Based on the investigations, a new empirical model is proposed for predicting the corrosion rate in corrosion-affected reinforced concrete structures considering parameters including concrete resistivity, temperature, relative humidity, corrosion duration and concrete chloride content. The comparison between the experimental data and those predicted using the new empirical model demonstrates that the new model gives a good prediction of the corrosion rate. Furthermore, the uncertainty and probability characteristics of these empirical models are also investigated. It is found that the probability distributions of the model errors can be described as lognormal, normal, Weibull or Gumbel distributions. As a result, the new empirical model can provide an efficient prediction of the corrosion rate of reinforcing steel, and the model error analysis results can be utilized for reliability-based service life prediction of reinforced concrete structures under chloride-laden environments.

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New Model for Estimating the Time-Variant Seismic Performance of Corroding RC Bridge Columns

Cited by 37 publications

References 32 publications

Modelling of Corrosion-Induced Concrete Cover Cracking Due to Chloride Attacking

Modelling of Corrosion-Induced Concrete Cover Cracking Due to Chloride Attacking

Improved time-dependent seismic fragility estimates for deteriorating RC bridge substructures exposed to chloride attack

Empirical model of corrosion rate for steel reinforced concrete structures in chloride-laden environments

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