2026-04-18T02:26:19Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/92902024-06-20T00:05:19Zcom_10259_4809com_10259_5086com_10259_2604col_10259_4810

00925njm 22002777a 4500 dc Mena Alonso, Álvaro author González Cabrera, Dorys Carmen author Mínguez Algarra, Jesús author Vicente Cabrera, Miguel Ángel author 2024-01-12 This paper studies the size effect on flexural fatigue in concrete. In particular, the main objective is to evaluate how the addition and content of steel fibers affect this size effect. For this purpose, four types of concrete have been produced: plain and reinforced concrete with fiber contents of 0.3%, 0.6% and 1%. Two prismatic specimen sizes were considered: 75×75×300 mm, named S, and 150×150×600 mm, named L. All specimens were subjected to 3-point bending fatigue at the same relative stress levels up to failure. The results reveal very interesting conclusions. The fibers mitigate the size effect on fatigue life, going from a difference of three orders of magnitude in PC, to practically zero in SFRC. Furthermore, it is observed that fibers do not necessarily improve fatigue life; in fact, the trend changes depending on specimen size. Finally, it is shown that the secondary crack opening rate dCMOD/dn has a good correlation with fatigue life, explaining the dispersion of N in general and the size effect in particular. 0950-0618 http://hdl.handle.net/10259/9290 10.1016/j.conbuildmat.2023.134424 Size effect Flexural fatigue Fiber-reinforced concrete Cracking in concrete Secondary crack opening rate Size effect on the flexural fatigue behavior of high-strength plain and fiber-reinforced concrete