Abstract
In this paper, we investigate an inelastic behavior of viaduct systems, which consist of a superstructure, piers and bearings, under bi-directional earthquake motions. First, we construct a three-dimensional geometrical and material nonlinear dynamic analysis program. Next, when the viaduct system including adjacent structures is subjected to bi-directional earthquake motions, we investigate the effect of the bidirectional moments and torsional deformation on the dynamic inelastic behavior of the viaduct system. The resultant dynamic behavior is also compared with the one under the one directional earthquake motion. Furthermore, we investigate an applicability of the equivalent cantilever column model under bi-directional earthquake motions.
