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Análisis comparativo de las formulaciones existentes para evaluar la resistencia a cortante de hormigón con fibras

Authors: Parrales Clavijo, José Miguel;

Análisis comparativo de las formulaciones existentes para evaluar la resistencia a cortante de hormigón con fibras

Abstract

El hormigón reforzado con fibras de acero (HRFA) es un material compuesto, con la capacidad de mantener una resistencia residual post fisuración por el efecto puente que crean las fibras en la fisura crítica. En vigas, este hecho ayuda a mejorar el comportamiento a: tracción y flexotracción, lo cual implica también un aumento en la resistencia a cortante. Existen varios modelos empíricos que han intentado predecir la resistencia a cortante, cada uno de con cierto nivel de dispersión debido a los parámetros específicos o comunes que consideran. La falta de unanimidad en los criterios con respecto al mecanismo de transferencia de corte, deriva en que la elección de una formulación que refleje con precisión la resistencia de una viga de HRFA sea motivo de incertidumbre. El objetivo de este estudio ha sido analizar las diversas formulaciones existentes para predicción de resistencia a cortante, comparando el resultado experimental con el resultado teórico propuesto (𝑉���𝑒���𝑥���𝑝���/𝑉���𝑡���𝑒���𝑜���). Para ello, se empleó una base de datos de 219 vigas de HRFA, la cual se redujo a 150 vigas, descartando los elementos que no cumplían con las condiciones necesarias. Se han analizado un total de 16 modelos incluyendo formulaciones de: campañas experimentales, normativas, guías, algoritmos evolutivos, y el Multi Action Shear Model con la extensión a fibras. La comparación de resultados se ha realizado mediante: análisis de indicadores estadísticos, evaluación por la recomendación “Demerit Points Classification” de Collins y estudio el comportamiento de los mejores modelos en función de los principales parámetros.

Country
Spain
Keywords

Construcció en formigó armat amb fibres, :Enginyeria civil [Àrees temàtiques de la UPC], Hormigón reforzado con fibras, Reinforced concrete construction, Assaigs de materials, Materials -- Testing, resistencia a cortante, Àrees temàtiques de la UPC::Enginyeria civil

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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