Abstract: The electrical impedance of a dumbbell-shaped rubber sheet (1) is measured, and the deterioration of the dumbbell-shaped rubber sheet (1) is detected from the result of the measurement. The present invention relates to a method of detecting a change in the property of a rubber member or a rubber member of a rubber bearing, such as a change in the shape or dimensions thereof, a change in the state of the stress and strain thereof, deterioration thereof, and the like.

Abstract: A seismic isolating bearing for supporting a building on a foundation includes a laminated body adapted to be interposed vertically between the upper and lower structures. The laminated body comprises alternately arranged viscoelastic layers and stiffener plates, having a hole defined vertically therein, and an energy absorber assembly disposed in the hole, for absorbing energy applied thereto. The energy absorber assembly comprises a lead block inserted in the hole, with the lead block having an intermediate portion held against an inner circumferential surface of the hole. The energy absorber assembly also has a viscoelastic cylindrical body disposed between an outer circumferential surface of at least one of upper and lower end portions of the lead block and the inner circumferential surface of the hole.