The effect of fatigue loads on one of the main mechanical properties of fiber-reinforced high strength concrete (FRHSC) is studied in this work. In particular, this paper analyzes the variations in the residual tensile strength of steel fiberreinforced concretes following cyclic flexural loading, which causes a predefined level of damage. To do so, a total of 40 prismatic specimens were tested. The specimens were not notched, but had previously been subjected to precracking. This has a similar effect to notching, but with a much smaller radius around the edge of the crack, which is therefore more vulnerable to fatigue. The results show that the damage provokes a progressive reduction in the residual traction strength. The study proposes two numerical expressions for the stress-crack width softening curves under tensile loads: an exponential formulation and a potential formulation. In both cases, the coefficients of both formulations depend on the damage that is induced. In addition, the proposal is to use fitted curves of the above-mentioned potential type.
This paper discusses the residual modulus of elasticity of and maximum compressive strain in high‐strength concrete (HSC) and fibre‐reinforced high‐strength concrete (FRHSC) after being subjected to axial high‐stress‐level cyclic loading. The paper presents a specific procedure for evaluating the residual values of these mechanical parameters of concrete specimens.This procedure reveals that there is no monotonic decrease in the residual modulus of elasticity with number of cycles; an initial decrease occurs in all cases, followed by an increase and, finally, another decrease. Similarly, there is no monotonic increase in the residual maximum compressive strain.The results show substantial changes in both the residual modulus of elasticity of and the residual maximum compressive strain in concrete depending on the number of cycles. These variations are due to the combined action of two concrete phenomena: microcracking and reconsolidation of the concrete microstructure.
Cómo citar este artículo/Citation: Urruchi-Rojo, J. R., Martínez-Martínez, J. A., Serrano-López, R. (2016). De la bóveda de medio punto a la bóveda escarzana en los puentes de piedra. Influencia del rebajamiento y del relleno rígido en la variación de la carga de rotura.
RESUMENLa forma de las bóvedas de los puentes de piedra ha ido evolucionando con el tiempo, existiendo bibliografía en la que además de recomendarse una tipología frente a otra, según la época, se prescribía la manera de ejecutar el relleno del trasdós. Todo ello surgía en un principio como fruto de las experiencias adquiridas durante la construcción y observación de los puentes. Así fueron emergiendo, a partir del siglo xviii, formulaciones que en unos casos aportaban un resultado y en otros el contrario. Este artículo pretende realizar una comparación entre varias de estas formulaciones, así como efectuar un análisis de la influencia en la variación de la carga de rotura, tanto del rebajamiento de la bóveda como de la participación del relleno rígido en el trasdós del mismo.Palabras clave: puentes de piedra; arco; rebajamiento; relleno rígido; bóveda.
ABSTRACT The shape of the vaults in masonry bridges has evolved during the history, so that we can find bibliography where, besides recommending one way of build instead of others depending on the period, is also prescribed the way to carry out the backfill of the extrados. All of this emerged initially as a result of the experiences acquired during the construction and the observation of bridges. Hence, during the 18th century new formulations started to arise, but they led to one result in some cases and to the opposite in others. This article tries to make a comparison between some of these formulations, as well as carrying out an analysis of the influence of both, the lowering rise/span ratio of the vaults and the presence of a resistant backfill in its extrados, on the variation of the breaking load.Keywords: masonry bridges; arch; rise/span ratio; resistant backfill; vault. De la bóveda de medio punto a la bóveda escarzana en los puentes de piedra. Influencia del rebajamiento y del relleno rígido en la variación de la carga de rotura
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