Seismic response control of adjacent buildings coupled by semi-active shared TMD

Abstract

A tuned mass damper (TMD) is one of the most widely used and accepted systems for the vibration control of building structures subjected to earthquake loads. In large cities, tall buildings are now being constructed closer together. A shared tuned mass damper has been proposed for the vibration control of adjacent buildings. If a shared TMD is designed to effectively reduce the dynamic responses of one building, the control performance for the other building deteriorates. This is because the stiffnesses and damping coefficients of the passive shared TMD connected to each building are fixed. A semi-active shared TMD was proposed in this study to immediately adjust the control force of the shared TMD to each building connected by the shared TMD. The control performance of the semi-active shared TMD was investigated using numerical analyses. For this purpose, two 8-story buildings were used as example structures. Magnetorheological (MR) dampers were used to create the semi-active shared TMD. A multi-input multi-output (MIMO) fuzzy logic controller (FLC) was developed to control the command voltages sent to each MR damper. A multi-objective genetic algorithm was employed to optimize the MIMO FLC. An artificial ground motion was used as an excitation. Based on numerical analyses, it was shown that a semi-active sheared TMD can provide better control performance than that of a conventional TMD, although the semi-active sheared TMD uses only half of the mass used by the conventional TMD system.