Stochastic Response Analysis of Connected Buildings against Random Earthquake using SMA and Yield Damper

The current research focuses on the seismic response control effectiveness of SMA damper over a yield damper while linking two neighbouring structures (stiff and flexible). In this study, stochastic response analysis was carried out for a random earthquake simulated using Kanai-Tajimi power spectra. For yield/SMA damper linked structure to disconnected structure, the root mean square (RMS) floor acceleration and displacement ratios are computed as response quantities. It has been discovered that a certain amount of damper normalised strength decreases the reactions. Furthermore, SMA dampers minimise both the stiff building acceleration and the flexible building displacement, which yield dampers do not. To illustrate the robust and better control efficiency of the SMA damper over the yield damper, various building parameters (time period, frequency ratio and damping ratio) and diverse seismic loading situations (intensity and frequency) were used. This research revealed that the SMA damper decreases the RMS acceleration ratio by 33% for flexible buildings and 35% for stiff buildings when compared to the yield damper. In addition, as compared to the yield damper, the SMA damper reduces RMS displacement by 35% for flexible buildings and 32% for rigid buildings. As a result, for seismic vibration management of linked structures, SMA dampers outperform yield dampers.