PURPOSE: To reduce response by vibrations by amplifying the damping resistance of a damper by utilizing the arm ratio of the levers of a vibration damping and amplifying device connected between structures or the diametral ratio of pinions and working the damper in the horizontal bidirections.
CONSTITUTION: A rigid material 1 connects a structure A and a rigid material 3 as a lever at a rigid contact (a) and rotatory fulcra (c), a rigid material 2 ties a structure B and the rigid material 3 at a rigid contact (b) and roller fulcra (d), and a damper 4 binds the rigid material 1 and the rigid material 3 at a rigid contact (f) and roller fulcra (e). When the ratio of size from the points (c) to the points (d) to size from the points (c) to the points (e), an arm ratio, is set in 1:λ, input displacement in the damper width direction to a vibration damping and amplifying device C and the displacement of the fulcra (d) of the lever reach 1/√21/2 times when relative displacement by an earthquake, etc., is generated between the structures A, B and the horizontal displacement s=1 of the rigid contact (b) is generated in the Y axial direction. Input displacement (t) to the damper 4 is amplified to arm-ratio λ times and reaches λ/√21/2 times, and finally damping resistance Cs transmitted over the structure B is further amplified to λ/√21/2 times.
KAMURA HISAYA
KATO YOSHINORI
IIDA YASUHIKO
