A new proposal for defining the ductility of concrete-reinforcement steels by means of a single parameter

Creazza, Giuseppe; Russo, Salvatore

doi:10.1007/bf02485990

Cited by 15 publications

(7 citation statements)

References 1 publication

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“…Again, the strength-hardening ratio and the ductility ratio gave a measure of the ductility of the rebar in various forms. The strength-hardening ratio provided an idea of ductility in terms of strength, whereas the ductility ratio provides the information in terms of displacement (Creazza and Russo, 1996). The product of these two ratios gave the ductile area parameter for the rebar (Beeby, 1997).…”

Section: Study Made Using Results Presentedmentioning

confidence: 99%

Behavior of thermo-mechanically treated rebar exposed to elevated temperatures

Choubey

Kumar

Dutta

et al. 2022

JSFE

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PurposeThe purpose of the paper is to mathematically model and predict the characteristics of thermo-mechanically treated (TMT) rebar when subjected to elevated temperatures.Design/methodology/approachData were collected from a few selected studies for developing the constitutive relations. Using the exposed temperature and the duration of heating as independent variables, the empirical relations were developed for determining the changes in mechanical properties of TMT rebars at elevated temperatures.FindingsRecrystallization of TMT rebar crystals took place around 500 °C, which led to a decrease in the dislocation density along with the increase of large-sized grains, resulting in the degradation of strength. Up to a temperature range of 500 °C, the normalized fracture strength was higher, while the normalized fracture strain is not so high. This indicated a failure of brittle nature.Originality/valueThis is an original work done by others as a study to theoretically predict the mechanical behavior of TMT rebars when exposed to elevated temperature.HighlightsThe TMT bars showed brittleness characteristics up to 500 °C and showed ductility characteristics after that on account of its recrystallization and extensive tempering of the outer martensitic rim around that temperature.The comparison between the super ductile (SD) TMT and the regular TMT exhibit shows that the SD-TMT bars were about 1.5 times more ductile than the normal ones.

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Section: Study Made Using Results Presentedmentioning

confidence: 99%

Behavior of thermo-mechanically treated rebar exposed to elevated temperatures

Choubey

Kumar

Dutta

et al. 2022

JSFE

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“…The present paper analyzes the ones put forward by Cosenza (Cosenza, Greco & Manfredi, 1998). and Creazza (Creazza & Russo, 1998).…”

Section: Equivalent Steel the Conceptmentioning

confidence: 99%

Propuesta de un nuevo indicador para definir la ductilidad aplicada a la corrosión del acero de refuerzo en estructuras de hormigón = Proposal of a new indicator to define ductility applied to corroded steel reinforcement on concrete structures

Moreno

Barrio

González

et al. 2015

ADE

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ResumenLa carbonatación del hormigón o la intrusión de cloruros en suficiente cantidad para alcanzar el nivel de las barras, es desencadenante de la corrosión de la armadura. Uno de los efectos más significativos de la corrosión del acero de refuerzo en estructuras de hormigón armado es la disminución de las propiedades relacionadas con la ductilidad del acero. El reforzamiento tiene un efecto decisivo en la ductilidad global de las estructuras de hormigón armado. Se utilizan diferentes códigos para clasificar el tipo de acero en función de su ductilidad usando los valores mínimos de varios parámetros. El uso de indicadores de ductilidad asociados a diferentes propiedades puede ser ventajoso en muchas ocasiones. Se considera necesario para definir la ductilidad por medio de un solo parámetro que tiene en cuenta los valores de resistencia y deformación simultáneamente. Hay una serie de criterios para definir la ductilidad del acero mediante un único parámetro. El presente estudio experimental se ocupa de la variación en la ductilidad de las barras de acero embebido en hormigón cuando se expone a la corrosión acelerada. Este trabajo analiza la idoneidad de un nuevo indicador de la ductilidad utilizado en barras corroídas. AbstractThe carbonation of concrete or the chlorides ingress in such quantity to reach the level of bars is triggers of reinforcement corrosion. One of the most significant effects of reinforcing steel corrosion on reinforced concrete structures is the decline in the ductility-related properties of the steel. Reinforcement ductility has a decisive effect on the overall ductility of reinforced concrete structures. Different Codes classify the type of steel depending on their ductility defined by the minimum values of several parameters. Using indicators of ductility associating different properties can be advantageous on many occasions. It is considered necessary to define the ductility by means of a single parameter that considers strength values and deformation simultaneously. There are a number of criteria for defining steel ductility by a single parameter. The present experimental study addresses the variation in the ductility of concrete-embedded steel bars when exposed to accelerated corrosion. This paper analyzes the suitability of a new indicator of ductility used in corroded bars.

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“…El primero contempla la relación f max /f y y el valor de ε max para los tres aceros, y compara estos valores con los valores mínimos exigidos en la Instrucción EHE-08 (26) y del mismo modo con los valores comprendidos en los códi-gos europeos MC-90 y EC-2 (28,29). El segundo método aplica el criterio de acero equivalente (p, y los índices A * y I d ), comparando estos valores con los que se obtendrían aplicando los criterios de Cosenza y col., Creazza y col. y Ortega para los aceros usualmente utilizados 500SD, 500N o 500H (23)(24)(25). El criterio de acero equivalente ofrece un único parámetro para evaluar la ductilidad, siendo esta información de gran relevancia para comparar diferencias de ductilidad entre diferentes tipos de aceros (32).…”

Section: Materiales Y Métodosunclassified

Ductilidad del acero inoxidable bajo en níquel para estructuras de hormigón armado

Escamilla¹,

Bastidas²,

González³

et al. 2011

Mater. construcc.

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Palabras clave: acero bajo en níquel, ductilidad, armaduras, acero equivalente, estructuras de hormigón armado. SUMMARYThis paper discusses the stress-strain curves for a new low nickel stainless steel, a conventional AISI 304 stainless steel and a carbon steel commonly used in reinforced concrete structures. Ductility was studied in terms of ultimate tensile strength (f max ), elastic limit (f y ) and total elongation at maximum force [ultimate strain; uniform elongation] (ε max ). The three materials were assessed with internationally accepted criteria, such as plastic rotational capacity, necking region and the toughness index (total energy absorbed at uniform elongation). The findings were compared to the properties of three types of conventional reinforcing steel: 500SD, 500N and 500H (EC-2).

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A new proposal for defining the ductility of concrete-reinforcement steels by means of a single parameter

Cited by 15 publications

References 1 publication

Behavior of thermo-mechanically treated rebar exposed to elevated temperatures

Behavior of thermo-mechanically treated rebar exposed to elevated temperatures

Propuesta de un nuevo indicador para definir la ductilidad aplicada a la corrosión del acero de refuerzo en estructuras de hormigón = Proposal of a new indicator to define ductility applied to corroded steel reinforcement on concrete structures

Ductilidad del acero inoxidable bajo en níquel para estructuras de hormigón armado

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