To exhibit the frictionlike historical characteristic in a repeating and stable manner by providing a damper to generate the damping force by the frictionlike historical characteristic when the load is not less than the prescribed value in a passive mass damper comprising a weight, a restoring element, and the damper.
A weight 3 is supported by a laminated rubber 2 as a restoring force element on a damper installation floor 1 of a building to be controlled in vibration, one end of the damper 4 is connected to the weight 3, and the other end of the damper 4 is connected to a reaction receiver 5 fixed to the damper installation floor 1. The damper 4 generates the damping force when the load on the weight 3 reaches not less than the prescribed value to exhibit the friction-like historical characteristic. A piston provided with an oil passage having a relief valve to permit the movement of the working oil in the advancement and retreat, is fitted into a cylinder filled with the working oil 6. The applicable range can be expanded not only for large earthquakes but also small ones.
MINEWAKI SHIGEO
AIZAWA SATORU
OTAKE KAZUO
KATAYAMA TAKESHI
SHIMANO YUKIHIRO
TANAKA TOSHIYUKI
