Vibration Control of Adjacent 2 Structures using Joint Dampers with Variable Stiffness and Damping

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This research consists of mainly following two parts of which results are as follows :In order to use Active Mass Dampers (AMD) for the seismic response control of structures, excessive auxiliary mass displacements must be avoided even under a high level of excitation, which becomes a critical factor in the event of strong earthquakes. The control algorithm for the full-scale multi-story steel frame test structure at DPRI, Kyoto University takes advantage of a nonlinear control scheme based on a variable gain method to overcome this difficulty. The nonlinear control scheme based on a variable gain method to overcome this difficulty. The nonlinear control used in the test achieves effective use of AMD with a limited displacement range of the auxiliary mass for structures under various levels of seismic input. The structural control test is conducted to verify the efficiency of the variable gain control scheme when used with the full-scale test structures. The test result using a seismic record shows the effectiveness of the control method, especially when subjected to a strong earthquake excitation.Control methods for seismic response reduction using an actuator installed between two buildings are investigated. Simultaneous control of two structures is possibly more difficult than controlling a single building. In this research, response of two real buildings consisted of 3-story and 5-story connected by an actuator is studied by numerical simulation and experiments. Two robust control theories are applied to the numerical calculation. The one is the H-infinity norm optimal control theory which is essentially a frequency domain design, and the other is the Sliding mode control theory, which is a design method in the time domain, Application of these theories proves to effectively reduce the seismic response.