Tuned Liquid Dampers (TLDs), as passive control devices, have been used in high-rise buildings for vibration control. A TLD dissipates energy through the sloshing of the water inside the tank. Modified Tuned Liquid Damper (MTLD) utilizes the rotational spring system at the base, therefore the MTLD experiences both horizontal and rotational motions. In this study, MTLD-structure system subjected to sinusoidal excitation and seismic events has been investigated using Lu's analytical model. This analytical model has been verified experimentally using Real-Time Hybrid Simulation method. The important parameters of the MTLD including the dimensionless rotational stiffness parameter, mass ratio, frequency ratio and damping ratio were studied in detail; and a preliminary design procedure was outlined.iii Acknowledgments I would like to really appreciate my research supervisor, Professor Oya Mercan, who provided me the most useful guidance, encouraged me and helped me to modify my thesis with more patience. And most importantly, she offered me an opportunity to complete my M.A.Sc Degree in one year. I am also grateful to my second reader, Professor Karl Peterson, who spent time to review my thesis and gave me the most valuable comments and suggestions during my defence.
A screw jack is a device which converts input torque into amplified axial force, capitalizing on the device's gearbox mechanism. Traditionally used in auto repair shops, the screw jack has been studied for the first time for active structural control. The dynamic properties of the device were investigated using open loop control, and the screw jack was found to have a high delay between command and measured force. Numerical simulations and parametric studies of SDOF systems with an LQG-controlled screw jack showed improvements to structural performance at four different levels of control effort. Loop simulation method experiments were conducted under seven ground motion records-benefits to structural response were dependent on the type of earthquake, with greater benefits observed for records with greater low-frequency content. Future work should investigate the types of structures and earthquakes for which the screw jack is most impactful using real-time hybrid simulation.
In this industry-academia collaboration, a multiplatform hybrid numerical simulation was performed to assess the effectiveness of a tuned liquid damper (TLD) to be installed in a high-rise condominium located in Downtown Toronto. The structure was modeled using OpenSees, while the nonlinear TLD model was developed in MATLAB. A dynamic analysis was performed using statistically-generated dynamic wind loads. It was determined that the TLD improved the performance of the structure (storey acceleration, roof drift) for various levels of wind loading, improving the comfort of the residents of the building. Minimal benefit was observed for reducing base shear as well as storey shear demands on the structure.
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