The aim of the present work was to investigate the post-peak cyclic behavior of Steel Fiber Reinforced Concrete (SFRC) under bending by means of an experimental campaign. The effects of two different volume fraction of fibers (0.5% and 1.0%) and three different load levels have been considered and the fatigue performances of plain and SFRCs are compared. Static monotonic tests were performed as reference. The results from fatigue tests have been compared in terms of cyclic creep curves and S-N diagrams. Special attention was devoted to the crack opening rate, the material toughness, the energy dissipation and the stiffness degradation. It highlighted that fibers can improve the fatigue life of SFRC for high load levels (low-cycle fatigue), whereas with the high-cycle fatigue fibers don’t seem to be effective. In both cases, however, fibers seem to improve the energy dissipation. Moreover, even though the increase of fiber content improves the fracture properties, it does not seem particularly effective on the fatigue properties.
Fatigue behavior of SFRC under Bending
GERMANO, Federica;PLIZZARI, Giovanni
2012-01-01
Abstract
The aim of the present work was to investigate the post-peak cyclic behavior of Steel Fiber Reinforced Concrete (SFRC) under bending by means of an experimental campaign. The effects of two different volume fraction of fibers (0.5% and 1.0%) and three different load levels have been considered and the fatigue performances of plain and SFRCs are compared. Static monotonic tests were performed as reference. The results from fatigue tests have been compared in terms of cyclic creep curves and S-N diagrams. Special attention was devoted to the crack opening rate, the material toughness, the energy dissipation and the stiffness degradation. It highlighted that fibers can improve the fatigue life of SFRC for high load levels (low-cycle fatigue), whereas with the high-cycle fatigue fibers don’t seem to be effective. In both cases, however, fibers seem to improve the energy dissipation. Moreover, even though the increase of fiber content improves the fracture properties, it does not seem particularly effective on the fatigue properties.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
