This study evaluates a prestressing effect of reinforced concrete (RC) beam strengthened with a pre-strained iron shape-memory alloy (Fe-SMA) strip. A pre-strained value was chosen as experimental variable to investigated the prestressing effect on the RC beams. A recovery stress on the pre-strained Fe-SMA strip occurred by heating, when the deformation of the strip was restricted. The recovery stress introduced a compressive force to the surrounding concrete, resuting in the upward deflection (camber effect). With this finiding from experimental tests, it could be concluded that the Fe-SMA strip can be used as the strengthening material to strengthen the damaged structure and to increase its durability.