Study Effect of Ni-Ti Shape Memory Alloy on Ductility of Steel Plate Shear Walls

Five specimens one third scale three-story single bay steel plate shear wall with variant percentage of Ni-Ti shape memory alloys(SMAs) under cycling loading were analyzed by Opensees software. Also one specimen steel plate shear wall without SMA (SPSW-Base) wase analyzed under same cycling loading by the same software. The result of analysis of five specimens steel plate shear walls with shape memory alloy and one specimen of steel plate shear wall without SMA, compared with each other. All specimens had rigid beam-to-column connections. Shape memory alloys used in three different type in SPSW’s stories respectively in first type,in all stories in second type, in just one first and third story and in third type in just middle story. Also these materials used as kind of plates which surrounde all side ofsteel plate ofwalls, with similar thickness to steel plate and variant widthsuch a percent of widths steel plate of SPSWs. If th whole width of steel plate shear wall is showed by ‘B’ and the whole width of used material by ‘b’, each three types respectively consist offive specimens with b/B=9%,18%,27%,36%,45%. All specimens were analyzed under nonlinear static analysis. After analysis, all specimens with shape memory alloy showed more ductility in comparision with the one without shape memory alloy (SPSW-Base). Also by increasing SMA ductility increased in steel plate shear walls. In addition among three different types, second wich, used SMA just in first and third story, showed more and better ductility. As an example the ductility of SPSW-b/B=45% in this type is 70/41% more than SPSW-Base.