VIBRATION CONTROL DEVICE FOR STRUCTURE.

摘要

A vibration control device for structures, which constitutes a double action vibration absorber of positive control type, in which a structure made of concrete or steel and having a room therein is placed on the top portion of a building via a support comprising a plurality of high damping laminated rubber members, and in which a driving member and an actuator for driving the driving member are provided inside the room of the structure. A dynamic damper is formed by suitably setting the spring constant (kb) of the support on the assumption that the weights of the structure and the driving members and the like accommodated therein constitute a first added mass (ma), and synchronizing the vibration period with the natural period of the building. The damping coefficient (Ca) of the support is set at a value greater than that of a normal dynamic damper, and the structure is vibrated by applying a control force (u(t)) corresponding to the response by the building to earthquake or wind to the driving member imparting a second added mass (mb), whereby the degree of response by the building is reduced.