Structural vibration control using semiactive tuned mass damper

Abstract

Recent civil engineering structures tend to be lighter, more slender and have smaller natural damping capacity than those of their older counterparts. This trend has increased the importance of damping technology to mitigate earthquake and wind induced vibrations. Therefore, it is very important to control these responses of structures and to improve the safety and serviceability of these structures under severe dynamic loads. This thesis presents the results of a study to verify the sufficient control performance of semiactive tuned mass damper and to identify suitable control methods for semiactive tuned mass damper in structural vibration control. In this study, four control algorithms are considered: on-off displacement based groundhook, on-off velocity based groundhook, clipped optimal and maximum energy dissipation algorithms. For semiactive tuned mass damper, MR damper is considered as a controllable damping device and the command voltage is calculated by the control algorithms. Each of the control theory is applied to the three story shear building excited by three earthquakes. The performance of each algorithm is compared with that of conventional tuned mass damper system using evaluation criteria. Also, to check the robustness of the semiactive tuned mass damper, stiffness and mass perturbations are applied to the system. The simulation results indicate that semiactive tuned mass damper has control efficiency. Furthermore sufficient robustness is guaranteed under structure uncertainties. Among the control algorithms, on-off displacement based control theory shows best efficacy and robustness.