ABSTRACT
This chapter presents a general view of current research and development into active and hybrid control systems relevant to the seismic response controlled structure conducted in the research institutes of private firms and universities in Japan and the United States. Reports are presented on active and hybrid control devices actually being utilized, focusing on those that have already been installed and that are in the experimental stage with the objective of practical application. The conventional philosophy can result in a decrease in an individual building's function and loss in its financial value, as well as preventing reuse of the building after severe earthquakes. A technology is required that will not only suppress the vibrations of individual buildings, but will preserve the information and communication function that sustains a city's life. A seismic response control system is defined as a system that fortifies the structure by imparting its particular characteristics or a control device that controls the earthquake motions.
