| 摘要 |
<p>A vibration control device for structures, which constitutes a double action vibration absorber of positive control type by providing a driving member of a predetermined mass mb as a second added mass body relative to a first added mass body of a predetermined mass ma, in which the first added mass body is provided on the structure via a support comprising a plurality of high damping laminated rubber pieces, whereby a downward arc-like running surface (4) is formed on which the second added mass body is to be run. The weight of the first added mass body is set to 1/500 to 1/1000 of the total weight of the structure to be vibration controlled, and the weight of the second added mass body to 1/20 to 1/100 of the weight of the first added mass body. A great damping factor ha of 10 to 50 % is set for the support, and the angular frequency φa of the first added mass body and the angular frequency φb due to the free vibration of the second added mass body on the arc-like running surface are synchronized with the natural circular frequency φ1, whereby a control force corresponding to the response of the structure is imparted to the driving member as a second added mass body, thereby reducing the response by the structure to earthquake or wind.</p> |
