Reliability aspects of structural control

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Abstract
To reduce the effect of lateral earthquake ground motion on structures, active control systems can be used. To-date, almost all the investigators have assumed that control forces are available immediately with precise magnitude as required. Using simulated earthquakes, it is shown that the failure probability is generally reduced by using a perfect control system. A time lag always exists, however, between the instant when a control force is needed and the instant when the required control force is actually generated. The time required to generate the desirable magnitude of the control force is termed the time-constant. The effect of these time factors on the reliability of structural control is investigated and illustrated with numerical examples.

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