2024 Volume 80 Issue 13 Article ID: 23-13155
As a seismic resilience measure for road bridges, a structure in which the lower plate setting bolts of the rubber bearings rupture between the initial yield strength of the piers and the maximum horizontal strength when the action exceeds the design seismic action is investigated. In this experiment, cyclic loading tests were conducted on a reinforced concrete bridge pier model to investigate the effect of rebars arrangement that provides the difference between the initial yield strength and the maximum horizontal strength of the piers. The pier model consists of large-diameter rebars placed in a crisscross pattern inside the columns in addition to the rebars normally required. From this study, the following results were obtained: (1) The lower plate setting bolts of rubber bearing ruptured after the initial yield strength; (2) It was confirmed that there was a difference between the initial yield strength and the maximum horizontal strength of the piers; (3) Column structures with large-diameter rebars arranged in a cross shape inside the pillars also failed due to the fracture of the axial rebars and the crushing of the core concrete, as with ordinary RC bridge piers.
