Shape memory alloy-tuned mass damper (SMA-TMD) for seismic vibration control

Abstract

Tuned-Mass-Damper (TMD) is a passive control device for vibration control of structures. However, the requirement of higher mass ratio restricts its applicability for seismic excitations. The improved performance of TMD is attempted herein by supplementing it with nonlinear restoring devices made of Shape-Memory-Alloy (SMA) (hence referred as SMA-TMD), motivated by its energy dissipation capability through micro-structural phase transitional hysteresis under cyclic loading. Extensive numerical simulations are conducted based on nonlinear random vibration analysis. A design optimization based on minimizing the root mean square displacement of the main structure is also carried in search for the optimal design parameters, latter validated through its performance under recorded ground motions. Significant improvements of the control efficiency and reduction of TMD displacement at a much reduced mass ratio is achieved by the SMA-TMD.