2026-05-30T06:21:21Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/111582025-12-18T01:05:38Zcom_10259_3969com_10259_5086com_10259_2604col_10259_3970

00925njm 22002777a 4500 dc Mena Alonso, Álvaro author Aragón Torre, Ángel author Vicente Cabrera, Miguel Ángel author González Cabrera, Dorys Carmen author Mínguez Algarra, Jesús author 2025-12 This study investigates the scatter in fatigue life (N) of fiber-reinforced concrete (FRC) as a function of variability in local fiber orientation and content. To this end, three FRC series were produced with fiber contents of 0.3 %, 0.6 %, and 1.0 %. All specimens were scanned using micro-computed tomography (microCT) and subsequently tested under flexural fatigue. The results show a clear correlation between fiber orientation and fatigue strength: within each series, specimens with a higher orientation factor ηX (which quantifies the degree of fiber alignment along the longitudinal axis) withstood a greater number of cycles to failure. A strong relationship was also identified between the number of fibers crossing the central section (Nfib,c) and fatigue life. Moreover, ηX and Nfib,c were found not to be independent variables, as a higher number of fibers is associated with better orientation. Finally, a model is proposed to estimate fatigue life as a function of ηX and fiber dosage, which shows adequate accuracy in predicting the scatter in N for sets of identical specimens. 2214-5095 https://hdl.handle.net/10259/11158 10.1016/j.cscm.2025.e05654 Steel-fiber-reinforced concrete Fatigue life Fiber orientation Microcomputed tomography Statistical variability Role of local fiber content and orientation on the scatter of flexural fatigue behavior in steel fiber-reinforced concrete