Implementation of shape memory alloy dampers for passive control of structures subjected to seismic excitations

Different crystallographic phases of shape memory alloy (SMA) materials were used in a damper in order to produce an effective behavior device capable of dissipating energy, while containing the recentering capability. Different methodologies were applied in the four proposed damper systems in order to optimize their implementation into the earthquake resistant structural systems. To compare the structural system performance by using the different devices, the idea of damage indicator was utilized with certain modifications. The structural damage, non-structural damage, and the damage to the contents of different systems with the permanent deformations of the systems were considered at different ground acceleration histories. The comparisons were made with the buckling restrained steel bracing system. The effectiveness of the implementation of SMA dampers in reduction of the residual deformations on the structure is presented even after very high ground motions.