Assessment of the structural performance of corrosion-affected RC members based on experimental study and probabilistic modeling

Lim, Sopokhem; Akiyama, Mitsuyoshi; Frangopol, Dan M.

doi:10.1016/j.engstruct.2016.08.040

Cited by 103 publications

(27 citation statements)

References 53 publications

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“…In particular, these beams revealed a significant amount of corrosion at the rebar failure section, which was reflected in the load-displacement curves as an attenuation of the yielding point. This finding is in agreement with previously reported experimental results [72][73][74] and it is attributed to a change in the apparent uniaxial stress-strain relation of steel bars with pitting corrosion [75,76]. Additional effects attributed to corrosion that are evident in Fig.…”

Section: Structural Performance 331 Load-deflection Diagramssupporting

confidence: 93%

The effect of fibres on steel bar corrosion and flexural behaviour of corroded RC beams

Berrocal

Löfgren

2018

Engineering Structures

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This paper reports the results of an experimental programme aimed at investigating the influence of fibre reinforcement on the corrosion process of conventional steel rebar embedded in cracked concrete and on the flexural behaviour of reinforced concrete beams. Un-and pre-cracked reinforced concrete beams were subjected to natural corrosion through cyclic exposure to a 10% chloride solution for a period of three years. Subsequently, flexural tests were carried out under three-point bending configuration. Gravimetric measurements showed higher corrosion levels for bars in plain concrete compared to fibre reinforced concrete, and visual inspection of the bars revealed that fibres promoted a more distributed corrosion pattern. From detailed examination of the bars through 3D laser scanning technique, the main parameter controlling the local corrosion level of individual pits appears to be the local interfacial conditions; grater loads during pre-cracking and repeated load cycles yielded greater cross-sectional losses. Moreover, there was a tendency for more localized corrosion in beams with open cracks, indicating a possible impact of crack width on the extension of corrosion. The results from the flexural tests showed a consistent increase of load capacity for fibre reinforced beams compared to their plain concrete counterparts but only a marginal influence of the fibres on the rotation capacity. Furthermore, the rotation capacity of the beams was found to decrease several times faster than the load capacity with increasing loss of rebar cross-sectional area.

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Section: Structural Performance 331 Load-deflection Diagramssupporting

confidence: 93%

The effect of fibres on steel bar corrosion and flexural behaviour of corroded RC beams

Berrocal

Löfgren

2018

Engineering Structures

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“…In previous studies, spatial variability of pitting corrosion along the length of reinforcing bars at material level has been investigated experimentally and numerically [18,23,46,47]. The main aim of previous studies was to develop a series of time-dependent probabilistic distribution functions to be used in reliability assessment of RC components and structures.…”

Section: Spatial Variability Of Pitting Corrosionmentioning

confidence: 99%

“…However, considering spatial distribution of pitting corrosion along the length of corroded RC components at material level might influence the global seismic vulnerability of RC structures. In other words, disregarding the spatial variability of pitting corrosion in the analyses may result in underestimating the probability of failure of corroded RC structures [23]. A number of studies have focused on reliability assessment of corroded RC members using a probabilistic distribution function to model the location of maximum pitted depth along the length of RC beams [24].…”

Section: Introductionmentioning

confidence: 99%

Probabilistic seismic vulnerability analysis of corroded reinforced concrete frames including spatial variability of pitting corrosion

Dizaj

Madandoust

Kashani

2018

Soil Dynamics and Earthquake Engineering

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A probabilistic framework for seismic vulnerability analysis of corroded Reinforced Concrete (RC) frame structures is developed. An advanced nonlinear finite element modelling technique is used to accurately simulate the nonlinear behaviour of prototype corroded RC frames over their service life. Different sources of uncertainties including modelling uncertainties, geometrical uncertainties and spatial variability of pitting corrosion are considered through Monte Carlo simulation and using Latin Hypercube Sampling (LHS) technique. A set of new seismic damage limit states (SDLS) are defined accounting for multiple failure modes of the corrosion damaged frames by means of pushover analyses. The influence of corrosion on nonlinear dynamic behaviour of corroded RC frames is investigated through Incremental Dynamic Analysis (IDA) of proposed frame structures under 44 far-field ground motions. The impact of considering corrosion damaged SDLS, spatial variability of pitting corrosion, and record-to-record variability on seismic vulnerability of RC frames are explored and discussed in detail. It is concluded that disregarding the influence of corrosion on SDLS significantly underestimates the probability of failure of corroded RC frames. The analyses results show that spatial variability of pitting corrosion does not have a significant impact on global nonlinear behaviour and seismic vulnerability/reliability of corroded RC frames.

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“…In spite of all the advances achieved in defining both better structural models (Alipour et al, 2013;Biondini and Vergani, 2015;Lim et al, 2016) and the probabilistic models (Akiyama et al, 2010;Papakonstantinou and Shinozuka, 2013), the uncertainty in future corrosion is very high. This is not a matter of lack of knowledge or understanding, but a consequence of the manifold of factors, including environmental, use, quality of construction and workmanship, which influence the progression of corrosion and cannot be predicted beforehand.…”

Section: Time-dependent To Time-independent Safetymentioning

confidence: 99%

On the robustness to corrosion in the life cycle assessment of an existing reinforced concrete bridge

Cavaco

Neves

Casas

2017

Structure and Infrastructure Engineering

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Management of existing structures has traditionally been based on condition assessment, based on visual inspections, disregarding the susceptibility of different structural types to aging and deterioration. Robustness, as a measure of the effects of unpredictable damage to structural safety can be a complementary information to the results of inspection. Although robustness has mostly been used to evaluate the consequences of extreme events, a similar framework can be used to investigate the result of aging, allowing a better understanding of the potential effects of deterioration and allowing a better allocation of available maintenance funding. In this work, a probabilistic structural robustness indicator is used to quantify the susceptibility of structures to corrosion. The methodology is exemplified through a case-study comprising an existing reinforced concrete bridge deck, heav- * Corresponding author Email address: joan.ramon.casas@upc.edu (Joan R. Casas)Preprint submitted to Structure and Infrastructure Engineering December 29, 2016 ily damaged due to reinforcement corrosion, and finally demolished due to safety concerns. Robustness measures the bridge deck safety tolerance to reinforcement corrosion. The principal effects of corrosion, including loss of area and bond between concrete and steel are modelled using a non-linear finite element model, coupled with a Response Surface Method to compute the bridge reliability as a function of the corrosion level, and finally used to assess robustness. Results show that the redundancy of the bridge allow significant redistribution of loads between elements with different corrosion levels. As a result, the bridge presents significant robustness and tolerance to reinforcement corrosion.

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Assessment of the structural performance of corrosion-affected RC members based on experimental study and probabilistic modeling

Cited by 103 publications

References 53 publications

The effect of fibres on steel bar corrosion and flexural behaviour of corroded RC beams

The effect of fibres on steel bar corrosion and flexural behaviour of corroded RC beams

Probabilistic seismic vulnerability analysis of corroded reinforced concrete frames including spatial variability of pitting corrosion

On the robustness to corrosion in the life cycle assessment of an existing reinforced concrete bridge

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