Residual stress – Strain relations inversely derived from experimental moment - Curvature response of RC beams with fibres: Comparison to RILEM recommendations

Abstract

This study aims to investigate adequacy of the RILEM residual stress modelling approach. For this, the residual stress strain relations composed using the tests results of standard notched beam are compared to the stress - strain diagrams inversely obtained from the experimental moment-curvature response of RC beams reinforced with steel fibers. For this purpose, an experimental study of 8 full-scale SFRC beams with longitudinal reinforcement bars including the tests of standard notched beams was carried out. The varying parameters were volume levels of fibres and reinforcement ratio. To produce accurate moment – curvature diagrams, the beams were tested in four-point bending with measured strains at four levels throughout the constant bending zone. The predicted curvatures of SFRC beams following the RILEM recommendations were compared to the tests. Similarly, the residual stress - strain relations inversely derived from the structural tests were compared to the RILEM model.