<p>B.M frames are responsible for absorbing earthquake energy by reaching their cross-sectional yield point and undergoing non-elastic deformations. this, in turn, causes permanent deformations in the frames, and occasionally restoration is impossible so that the whole structure might have to be disposed . The vulnerability of moment frame joints to lateral loadings and the need to improve their performance necessitates the use of materials capable of undergoing large and restorable deformations. Shape memory alloys are one type of such materials that have found use for this purpose. Because of their super-elastic property, these alloys are able to withstand non-elastic stresses and undergo large deformations, as well as to restore to their orginal configuration after being unloaded in the presence of the required conditions. In this paper these alloys will be introduced and their performance in moment frame joints will be studied..</p>