Comportamiento frágil de las armaduras corroídas

Ramos, Nuria Rebolledo; Torres, Julio

doi:10.33586/hya.2020.2434

Cited by 3 publications

(4 citation statements)

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“…The reduction in the overall beam height is considered only for the very heavily corroded beams

η_{w, sn} > 75 %

from reference 6 (being

η_{w, sn}

the web reinforcement section loss ratio, see Notations for a detailed definition). Despite the reasonably satisfactory results obtained by comparing the shear strength predictions by the CCCM extension for corroded beams with the empirical results for the slender beams included in the database, future developments (outside the scope of this article) should include consideration of bond deterioration, 30,31 reduction of concrete compressive strength at cracked concrete and change in the mechanical properties of the deteriorated bars 32,33 …”

Section: The Compression Chord Capacity Model For Slender Rc Beams An...mentioning

confidence: 98%

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Long‐term shear strength of RC beams based on a mechanical model that considers reinforcing steel corrosion

Frontera

Cladera

2022

Structural Concrete

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Corrosion of stirrups (generally with small diameters and concrete covers) significantly affects the shear strength of reinforced concrete elements. As shear failures may lead to brittle collapses, hence the need to avoid them during structures' entire service life. The Compression Chord Capacity Model (CCCM), a shear mechanical model, was recently extended to predict the strength of corrosion-damaged beams by identifying the model parameters that could be most affected by steel corrosion. In this paper, the CCCM is combined with two material deterioration models included in the new Spanish Structural Code, and considers carbonation of concrete or chloride ions, to predict long-term shear strength evolution. Finally, a parametric analysis is carried out to explore the effect of the most influential parameters on shear strength degradation according to the used models and depending on different exposure classes.

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“…The reduction in the overall beam height is considered only for the very heavily corroded beams

η_{w, sn} > 75 %

from reference 6 (being

η_{w, sn}

Section: The Compression Chord Capacity Model For Slender Rc Beams An...mentioning

confidence: 98%

“…Correlation of the experimental results and prediction versus the cross-sectional loss ratio of stirrups. CCCM, Compression Chord Capacity Model; CoV, coefficient of variation reduction of concrete compressive strength at cracked concrete and change in the mechanical properties of the deteriorated bars 32,33. …”

mentioning

confidence: 99%

Long‐term shear strength of RC beams based on a mechanical model that considers reinforcing steel corrosion

Frontera

Cladera

2022

Structural Concrete

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“…La reducción del canto se considera únicamente para las vigas severamente corroídas, ηw,sn>75%, de la referencia [6] (siendo ηw,sn el ratio de pérdida de sección de la armadura a cortante, ver la Notación para una definición más detallada). A pesar de los resultados razonablemente satisfactorios obtenidos al comparar las predicciones de la resistencia a cortante usando la extensión del CCCM para vigas que han sufrido ataques por corrosión con los resultados empíricos para las vigas esbeltas incluidas en la base de datos, desarrollos futuros (fuera del alcance de este artículo) deberían incluir la consideración del deterioro de la adherencia [30,31], la reducción de la resistencia a la compresión del hormigón fisurado y el cambio en las propiedades mecánicas de la barras corroídas [32,33]. Figura 4.…”

Section: Verificación Experimentalunclassified

Predicción a largo plazo de la resistencia a cortante de vigas de hormigón armado basada en un modelo mecánico considerando la corrosión de la armadura

Frontera,

Cladera

2024

hya

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La corrosión de los cercos, generalmente con un menor diámetro y recubrimiento, afecta significativamente la resistencia a cortante de los elementos de hormigón armado. Puesto que las roturas a cortante pueden provocar colapsos de carácter frágil, es necesario evitarlas durante toda la vida útil de la estructura. El Compresion Chord Capacity Model (CCCM, modelo de capacidad de la cabeza comprimida) es un modelo mecánico que ha sido extendido recientemente para predecir la resistencia a cortante de elementos dañados por los efectos de la corrosión. Este trabajo combina la capacidad del modelo mecánico con los dos modelos de deterioro incluidos en el nuevo Código Estructural para evaluar la resistencia a cortante a largo plazo, permitiendo considerar tanto la corrosión por carbonatación como la inducida por iones cloruro. Finalmente, en el artículo se lleva a cabo un análisis paramétrico para explorar el efecto de los parámetros más influyentes en la degradación de la resistencia a cortante según los modelos utilizados y en función de diferentes clases de exposición. Traducido por Antoni Cladera del artículo original publicado por Wiley en la revista Structural Concrete: Frontera A, Cladera A. Long-term shear strength of RC beams based on a mechanical model that considers reinforcing steel corrosion. Structural Concrete. 2023; 24(1): 25–40. https://doi.org/10.1002/suco.202200428

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“…There are several factors that cause damage to reinforced concrete (RC in what follows) structures, and the damage induced by the corrosion of reinforcement has a serious effect on durability [1][2][3][4] and on the loading capacity [5,6]. Corrosion is mainly caused by the action of chloride ions [7,8] and the penetration of carbon dioxide [9,10].…”

Section: Introductionmentioning

confidence: 99%

The Relationship between Concrete Strength and Classes of Resistance against Corrosion Induced by Carbonation: A Proposal for the Design of Extremely Durable Structures in Accordance with Eurocode 2

et al. 2023

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The new Eurocode 2 provides valuable information on the required concrete cover to protect reinforcement against corrosion induced by carbonation, for two design service life values of 50 and 100 years. However, to design structures with an even longer service life and assess existing ones, additional tools are necessary. The ‘square root of time’ relationship is a well-established method for estimating the penetration of the carbonation front, making it useful for long-term design and assessment purposes. In this article, we propose a new function that adjusts the evolution of the carbonation front to the Eurocode 2 values. This function is a powerful tool for designing extremely durable structures and assessing existing ones. To demonstrate its effectiveness, we provide two examples of its application.

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Comportamiento frágil de las armaduras corroídas

Cited by 3 publications

References 25 publications

Long‐term shear strength of RC beams based on a mechanical model that considers reinforcing steel corrosion

Long‐term shear strength of RC beams based on a mechanical model that considers reinforcing steel corrosion

Predicción a largo plazo de la resistencia a cortante de vigas de hormigón armado basada en un modelo mecánico considerando la corrosión de la armadura

The Relationship between Concrete Strength and Classes of Resistance against Corrosion Induced by Carbonation: A Proposal for the Design of Extremely Durable Structures in Accordance with Eurocode 2

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