Abstract
Non-linear 3-dimensional dynamic analyses of total bridge system under earthquake loading were carried out and the effects of 3-dimensional response on the behavior of the bridge pier were discussed. As the results of these considerations, in case 3-dimensional earthquake loading was input, the resisting capacities of sections of RC bridge pier degrade remarkably due to bi-axial bending. And because of the vertical vibration of superstructure, noteworthy additional bending moment generates at the top of the pier by considering 3-dimensional total bridge system. Furthermore, it becomes clear that the magnitude of 3-dimensional effects depends upon the configuration of bridge pier.
