2025 Volume 81 Issue 13 Article ID: 24-13553
Since the 1995 Great Hanshin Earthquake, the use of laminated rubber bearings has been increasing because of their high deformation capacity and their ability to cushion and transmit impact forces such as seismic forces through the rubber body itself. These laminated rubber bearings must maintain their performance even when level 2 earthquake motion is dominant, so it is important to understand the mechanical performance of the laminated rubber bearings in their ultimate state. In this study, a rubber bearing was subjected to a sufficient number of cyclic cycles of 175 % shear strain before being loaded at 250%, 175%, and 300% in sequence at actual velocity (about two second in period). During, the sliding behavior of the jig and the accompanying collision between the jig and the member occurred during the 300% excitation. We investigated the collision mechanism and estimated the impact coefficient.
