Experimental verification of multiinput seismic control strategies for smart dampers

This paper documents the results of an experimental study conducted to demonstrate the capabilities of multiple magnetorheological (MR) devices for seismic control of civil engineering structures. A six-story test structure in the Washington University Structural Control and Earthquake Engineering Lab (http://www.seas.wustl.edu/research/quake/) is considered, and four parallel-plate, shear-mode MR dampers are used to control this test structure. Two control devices are installed in the test structure between the base and first floor, and two are installed between the first floor and second floor. The system identification method used to develop a model of the integrated structural system is discussed. This method is an extension of a method successfully used in a previous semi-active experiment. Two semi-active control algorithms including a Lyapunov algorithm and a clipped-optimal algorithm are considered. An El Centro earthquake is used to disturb the system and three amplitude levels. The results indicate that high performance levels can be achieved, and the responses of the semi-active system are significantly better than that of comparable passive systems.

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