ABSTRACT
Presented are an analytical procedure to explain the mechanism of the collapse of the Daikai subway station during the 1995 Hyogoken-nanbu earthquake by considering nonlinear behaviors of both the subsoil and the structure. Then the validity of the method is examined by two approaches. In the first approach, computed displacement is compared with the observed permanent displacement of the small underground structure near the station. In the second approach, the same procedure is applied to the neighboring station which is similar structural situation, but not completely collapsed. Both approaches indicate that the method is effective. It is concluded that the station was collapsed by the lateral load caused by the nonlinear behavior of the ground.
