Rate effect in inclined fibre pull-out for smooth and hooked-end fibres: a numerical study

• Autor(a) principal: Poveda, Elisa
• Data de Publicação: 2020
• Outros Autores: Yu, Rena C., Tarifa, Manuel, Ruiz, Gonzalo, Cunha, Vítor M. C. F., Barros, Joaquim A. O.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/1822/71754
• topic: Rate-dependent friction; Smooth and hooked-end fibres; SFRC; Inclination angle; Pull-out rate; Engenharia e Tecnologia::Engenharia Civil; Science & Technology

Based on a numerical model to simulate the static behaviour of a smooth fibre extracted from a cementitious matrix, a rate dependent friction law, widely used in earthquake engineering for steady-state slip phenomena, is proposed to capture the rate effect observed in dynamic pull-out tests for both smooth and hooked-end fibres. After calibrating the friction coefficients with the experimental results of smooth fibres, the model is subsequently applied to predict the pullout behaviour of both smooth and hooked-end fibres at different inclination angles (0∘, 30∘ and 60∘) loaded at three different velocities (0.01, 0.1 and 1 mm/s). The global tendency of all the pull-out curves was captured, fibre’s cross sectional deformations were also reproduced remarkably well. Moreover, the developed model helps to cast light on the different mechanisms related to the pull-out process.