Abstract: There is disclosed a prop-type damping device which effectively consumes energy of up-and-down vibration on a main girder of a bridge caused by earthquakes, winds, passing vehicles or the like to prolong a life of the bridge and improve comfort for bridge users with a simple constitution. The prop-type damping device comprises: an inclined prop member having a higher end thereof connected to a lower part of a main girder of a bridge to be horizontally movable relative to the same, and a lower end thereof connected to a position below a main girder supporting point of a pier or abutment for supporting the main girder to permit up-and-down movement of the higher end; and a damper connected to the higher end of the prop member and the main girder lower part to brake relative horizontal movements therebetween.

Abstract: A tuned cradle type damping deice which can be tuned with low-order (e.g., 1 Hz or lower) vibration, and exhibits higher performance for maintenance and inspection with a simple constitution than a conventional one. This tuned cradle type damping device comprises: a support having a circular-arc support surface which is at least a part of a circle; two swings positioned on both outsides of a center axis extending direction of the circular-arc support surface of the support; and two rollers which are rotatably supported on the circular-arc support surface to be rolled thereon and moved around the center axis thereof, and both ends of which are rotatably connected to the two swings to support the two swings.

Abstract: There is disclosed a prop-type damping deice which effectively consumes energy of up-and-down vibration on a main girder of a bridge caused by earthquakes, winds, passing vehicles or the like to prolong a life of the bridge and improve comfort for bridge users with a simple constitution. The prop-type damping device comprises: an inclined prop member having a higher end thereof connected to a lower part of a main girder of a bridge to be horizontally movable relative to the same, and a lower end thereof connected to a position below a main girder supporting point of a pier or abutment for supporting the main girder to permit up-and-down movement of the higher end; and a damper connected to the higher end of the prop member and the main girder lower part to brake relative horizontal movements therebetween.

Abstract: There is disclosed a tuned cradle type damping deice which can be A, tuned with low-order (e.g., 1 Hz or lower) vibration, and exhibits higher performance for maintenance and inspection with a simple constitution than a conventional one. This tuned cradle type damping device comprises: a support having a circular-arc support surface which is at least a part of a circle; two swings positioned on both outsides of a center axis extending direction of the circular-arc support surface of the support; and two rollers which are rotatably supported on the circular-arc support surface to be rolled thereon and moved around the center axis thereof, and both ends of which are rotatably connected to the two swings to support the two swings.