Abstract
A large control force, in the semi-active structural control systems, can be obtained only by adjusting the characteristics of the control device itself with a small external energy supply. This enables a structural control system to be realized that is highly effective over the range from small to large earthquakes, and that is highly reliable and economical. The required function of the control system is realtime control and system management. The former contains control trigger determination, real time computation with several milliseconds and communication between the semi-active hydraulic damper (SHD) and computers. The latter contains measurement of a lot of information, health monitoring of the system, and emergency alarm. A control computer determines the damping force command to the SHD from the building's response measured by the sensors and outputs it to the communication computer with a sampling time of five milliseconds. One Com-C outputs the damping force command to four SHDs. A management computer monitors the condition of each SHD and communication situation of each computer, and determines whether or not it is normal.
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