A Novel Smart Memory Alloy Re-centering Damper for Passive Protection of Structures Subjected to Seismic Excitations Using High-Performance NiTiHfPd Material

Abstract

This research proposes and evaluates a superelastic memory alloy re-centering damper system for improving the reaction of steel frame buildings that have been exposed to several levels of seismic threat. The planned superelastic memory alloy re-centering damper (SMARD) relies on high-performance shape memory alloy (SMA) bars for its abilities of recentering and augments its deformation potential with friction springs. To begin, this study investigates the superelastic reaction of NiTiHfPd SMAs under a variety of conditions and shows how they can be used in seismic applications. To gather experimental results, uniaxial experiments on superelastic NiTiHfPd SMAs are performed at temperatures ranging from -35 to 25 oC and loading frequencies ranging from 0.05 to 1 Hz with four distinct strain amplitudes. We explore the impact of loading rate and temperature on the superelastic properties of NiTiHfPd SMAs. The complex answer of 6-floor and 9-floor steel special moment frame buildings with built SMARDs is then determined using an empirical model. Finally, nonlinear reaction time background simulations are used to characterize the actions of managed and unregulated buildings while 44 ground motion data are used. The results indicate that SMARDs will significantly reduce the dynamic behavior of steel-frame buildings at various seismic threat levels while simultaneously improving their post-earthquake functionality.