Prestressing Effect of Shape Memory Alloy Reinforcements under Serviceability Tensile Loads

Repairing and strengthening of existing aged steel-reinforced concrete structures is a major challenge. Today, much the repair work completed insufficient brittle. A promising new solution for tasks use iron-based shape memory alloy (Fe-SMA). The pre-strained Fe-SMA components enable pre-stressing building due to heat-triggered contraction steel. Thus, deflections can be reduced or even recovered. In addition, cracking process adapted, an improvement in load, under which first crack appears, possible. this paper, effects pre-stress generated by activated rebars, were centrally embedded inside specimen, are shown. objective study quantify loads show influences on load-bearing behavior process. For purpose, axial tensile tests performed bars with height, width, length 50 mm, 70 900 respectively. These compared usual construction steel but nonactivated rebars. evaluation patterns openings was done using digital image correlation (DIC). causes increase more than 150%, indicates clear state serviceability limit.