TY - JOUR ID - 2861 TI - Experimental Investigation on the Behavior of Reinforced Concrete Beams Retrofitted with NSM-SMA/FRP JO - Amirkabir Journal of Civil Engineering JA - CEEJ LA - en SN - 2588-297X AU - Farahi, Behrouz AU - Esfahani, Mohammadreza AU - sabzi, javad AD - M.Sc, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran AD - Professor, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran AD - Ph.D. Student, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran Y1 - 2019 PY - 2019 VL - 51 IS - 4 SP - 685 EP - 698 KW - Shape memory alloys KW - FRP Bars KW - Near-Surface Mounted Method KW - energy dissipation KW - Deformation Recovery DO - 10.22060/ceej.2018.13927.5512 N2 - Re-centering is an exclusive characteristic of superelastic Shape Memory Alloys (SMAs) which can be used in manufacturing and retrofitting of reinforced concrete elements. Reinforced concrete beams retrofitted with SMA bars have more ductility and higher energy dissipation compared to conventional RC beams. Furthermore, these beams experience less damage in consecutive loading-unloading cycles. The current research aims to investigate the behavior of reinforced concrete beams retrofitted with SMA bars using Near-Surface Mounted (NSM) flexural retrofitting method. Eleven RC beam specimens with the cross section of 200*150 mm and length of 1150 mm were cast. Three of the specimens had no external strengthening, four of them were retrofitted with SMA bars and other four beams were retrofitted with GFRP reinforcements. The specimens were subjected to three-point bending test under either monastic or loading-unloading. Different parameters including load-carrying capacity, energy dissipation, deformation recovery and reduction capability of crack width were investigated. The results showed that RC beams retrofitted with SMA bars had more mid-span deflection and higher energy dissipation compared to other specimens under monotonic loading. Moreover, under loading-unloading, RC beams retrofitted with SMA bars method experienced less damage. UR - https://ceej.aut.ac.ir/article_2861.html L1 - https://ceej.aut.ac.ir/article_2861_8e71f1f6ecb1bd9716d160d9333c2063.pdf ER -