| In this thesis, a composite SMA-Friction damper is proposed and designed by utilizing SMA and friction material. The control performance of the new damper is investigated. And the vibration control theory and control effectiveness of the damper in long-span lattice structures are studied. Through the research, following creative achievements have been made: Firstly, a theoretical modal of SMA-Friction damper is established and the damper's working performance is analyzed. By inputting sine waves, the hysteresis curves are obtained. In addition, parameter analysis of the SMA-friction damper is carried out. Secondly, the damping performance of the composite SMA-Friction damper is systematically investigated. A numerical simulation analysis for a single degree of freedom system is performed. It is shown that the SMA-Friction damper possesses a significant performance of damping. Finally, the developed SMA-Friction damper is applied to space truss structure and lattice shell structure to investigate its vibration control performance. Theoretical model of the system is established and a computer program for vibration control is finished. Then, the control performance is discussed by analyzing dynamic responses of spatial structures equipped with the new dampers subjected to three-dimension El-Centro earthquake actions scaled to small, medium and large seismic intensity, respectively. In the meantime, vibration responses of friction dampers controlled and SMA dampers controlled space lattice structures are employed to compare with that of the new composite dampers controlled space lattice structures. The results show that control performance of the SMA-friction composite damper is superior to that of both the friction damper and the SMA damper under all simulation conditions.
|
PDF Full Text Request