On the collapse evaluation of existing RC bridges exposed to corrosion under horizontal loads

Crespi, Pietro; Zucca, Marco; Valente, Marco

doi:10.1016/j.engfailanal.2020.104727

Cited by 38 publications

(26 citation statements)

References 28 publications

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“…Therefore, the main cable of a long-span multi-tower suspension bridge across the river and sea is always subjected to electrolyte corrosion. It was reported that electrolyte corrosion is one of main failure modes of existing bridges [17,18].…”

Section: Introductionmentioning

confidence: 99%

Review on the Service Safety Assessment of Main Cable of Long Span Multi-Tower Suspension Bridge

Wang

et al. 2021

Applied Sciences

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The long-span multi-tower suspension bridge is widely used in the construction of river and sea crossing bridges. The load-bearing safety and anti-sliding safety of its main cable are directly related to the structural safety of a suspension bridge. Failure mechanisms of the main cable of a long-span multi-tower suspension bridge are discussed. Meanwhile, the tribo-corrosion-fatigue of main cable, contact, and slip behaviors of the saddle and service safety assessment of the main cable are reviewed. Finally, research trends in service safety assessment of main cable are proposed. It is of great significance to improve the service safety of the main cable and thereby to ensure the structural safety of long-span multi-tower suspension bridges.

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Section: Introductionmentioning

confidence: 99%

Review on the Service Safety Assessment of Main Cable of Long Span Multi-Tower Suspension Bridge

Wang

et al. 2021

Applied Sciences

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“…With an increase of time, corrosion initiates as the amount of chloride accumulated at the surface of steel bar reaches a threshold value (Bastidas et al, 2015;Ghods et al, 2013;Monticelli et al, 2014;Tang et al, 2016). Steel bar corrosion causes concrete cover cracking (Cheng et al, 2018;Qiao et al, 2016;Sanz et al, 2013;Val et al, 2009;Yang et al, 2018), mechanical degradation of steel bar (Tang et al, 2014), reduction in carrying capacity of structural members, and even collapse of structures (Crespi et al, 2020). In addition, corrosion has a significant impact on the economy.…”

Section: Introductionmentioning

confidence: 99%

Localization and monitoring of initiation and propagation of corrosion-induced mortar cracking based on OFDR distributed optical fiber sensor

Tang

Zhao

Tian

et al. 2021

Journal of Intelligent Material Systems and Structures

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Optical frequency domain reflectometry (OFDR) optical fiber is characterized to monitor corrosion-induced mortar cracking, including localization and determination of crack initiation time, crack size, and crack length. Mortar cylinders containing a steel bar were prepared and subjected to accelerated corrosion test. The change of mortar surface condition due to steel bar corrosion was recorded with an OFDR optical fiber which was attached by using epoxy resin before corrosion test. Three fiber wrap spacing were considered including 20 mm, 50 mm, and 100 mm. Visual inspection was performed after corrosion test. Calibration test was also conducted to determine the transfer coefficient of cracking. Results show non-uniform corrosion occurred on steel bar and resulted in mortar surface cracking, which was reflected by the strain peaks appeared in the OFDR fiber strain curve. OFDR optical fiber can be used to identify the time of crack initiation, localize the position of cracks, and determine the width and length of cracks. Both the sensitivity and spatial resolution of OFDR optical fiber sensor increase with a decrease of the fiber wrap spacing.

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“…Zhang et al [7] proposed a seismic risk assessment method for the corrosion RC bridges with shearcritical columns. Crespi [8] presented a procedure for the collapse mechanism evaluation of the existing reinforced concrete motorway bridges under horizontal loads.…”

Section: Introductionmentioning

confidence: 99%

Life‐Cycle Seismic Fragility Assessment of Existing RC Bridges Subject to Chloride‐Induced Corrosion in Marine Environment

Wang

Guo

et al. 2021

Advances in Civil Engineering

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Bridges in a marine environment have been suffering from the chloride attack for a long period of time. Due to the fact that different sections of piers may be exposed to different conditionals, the chloride-induced corrosion not only affects the scale of the deterioration process but also significantly modifies over time the damage propagation mechanisms and the seismic damage distribution. In order to investigate the seismic damage of existing RC bridges subject to spatial chloride-induced corrosion in a marine environment, Duracrete model is applied to determine the corrosion initiation time of reinforcing steels under different exposure conditionals and the degradation models of reinforcing steels, confined concrete, and unconfined concrete are obtained based on the previous investigation. According to the seismic fragility assessment method, the damage assessment approach for the existing RC bridges subject to spatial chloride-induced corrosion in a marine environment is present. Moreover, a case study of a bridge under two kinds of water regions investigated the influence of spatial chloride-induced corrosion on the seismic damage of piers and other components. The results show that the spatial chloride-induced corrosion may result in the section at the low water level becoming more vulnerable than the adjacent sections and the alteration of seismic damage distribution of piers. The corrosion of pier will increase the seismic damage probability of itself, whereas it will result in a reduction of seismic damage probability of other components. Moreover, the alteration of seismic damage distribution of piers will amplify the effect. Due to the fact that the spatial chloride-induced corrosion of piers may alter the yield sequence of cross section, it then affects the seismic performance assessment of piers. A method to determine the evolution probability of yield sequence of corroded piers is proposed at last. From the result, the evolution probability of yield sequence of piers in longitudinal direction depends on the relationship between the height of piers and submerged zone. Moreover, the height of piers, submerged zone, and tidal zone have a common influence on the evolution of yield sequence of piers in transversal direction.

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On the collapse evaluation of existing RC bridges exposed to corrosion under horizontal loads

Cited by 38 publications

References 28 publications

Review on the Service Safety Assessment of Main Cable of Long Span Multi-Tower Suspension Bridge

Review on the Service Safety Assessment of Main Cable of Long Span Multi-Tower Suspension Bridge

Localization and monitoring of initiation and propagation of corrosion-induced mortar cracking based on OFDR distributed optical fiber sensor

Life‐Cycle Seismic Fragility Assessment of Existing RC Bridges Subject to Chloride‐Induced Corrosion in Marine Environment

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