Análisis de resultados de deformaciones y flechas en dos vigas de hormigón armado monitorizadas con sensores de fibra óptica embebidos = Analysis of deformation and deflection results in two reinforced concrete beams monitored with embedded fibre optic sensors

Julian García Díaz, Nieves Navarro Cano, Edelmiro Rúa Álvares


doi:10.20868/ade.2019.4367

Abstract


Conocer el comportamiento real de una estructura de hormigón armado es difícil. debido a los múltiples factores que influyen en el mismo. La heterogeneidad del hormigón y la evolución de sus características mecánicas y físicas a lo largo de la vida útil del material, hace que podamos obtener valores aproximados de su comportamiento. El objetivo de este trabajo de investigación es evaluar de una manera más precisa este comportamiento, mediante la inclusión en las estructuras de sensores de fibra óptica. Estos sensores nos proporcionan valores precisos de deformación en tiempo real, durante toda la vida de la estructura. Para obtener estos resultados, se han embebido los sensores en una viga de hormigón armado y se ha analizado realmente lo que le ocurre cuando la solicitamos a diferentes escalones de carga. Los resultados obtenidos los hemos comparado con los teóricos obtenidos del cálculo de resistencia de materiales, llegando a la conclusión de que, en efecto, las estructuras de hormigón armado son elementos complejos, pero que, con este sistema de monitorización, podremos obtener resultados más precisos de su comportamiento.

Abstract

Knowing the real behavior of a reinforced concrete structure is a difficult task due to the multiple factors that influence it. The heterogeneity of the work and the evolution of its mechanical and physical characteristics throughout the useful life of the material, makes it possible to obtain approximate values of its behaviour. The objective of this research work is to evaluate this behavior in a more precise way, through the inclusion of fiber optic sensor structures. These sensors provide us with precise values of deformation in real time, throughout the life of the structure. I have embedded the sensors in a reinforced concrete beam and I have really analyzed what happens when we request it at different load stages. The obtained results have been compared with the theoretical ones obtained from the calculation of resistance of materials, arriving at the conclusion that, in fact, reinforced concrete structures are complex elements, but that, with this monitoring system, we can obtain more precise results of his behavior


Keywords


Red de Bragg; Sensores de fibra óptica embebidos; hormigón autocompactante; fibra neutra; fisuración; Fiber Bragg grating; Fiber optic sensors embedded in concrete; Self-consolidating concrete; Neutral axis; Cracking.

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