Uniaxial behavior of pre-stressed iron-based shape memory alloy rebars under cyclic loading reversals

Iron-based shape memory alloys (Fe-SMA) have recently emerged as a promising alternative for structural design and retrofitting due to their unique self-prestressing ability. The feasibility of using Fe-SMA rebars, strips, stirrups improving the flexural shear behavior reinforced concrete beams slabs has been successfully demonstrated in many experimental investigations. However, existing studies mostly focused on applications where elements are subjected monotonic loading. On other hand, tension-compression reversals experienced by reinforcement under seismic actions, which makes it necessary characterize pre-stress cyclic loading reversals. More specifically, is important identify limit associated with complete loss Another research gap lack understanding inelastic buckling also application Fe-SMAs retrofitting. Specifically, an needed determining spiral spacing accurate moment-curvature analysis cross-sections columns rebars. This study aims address these gaps experimentally evaluating stress-strain pre-stressed rebars outcome this will facilitate developing analytical numerical models estimating response assist guidelines use applications.