Abstract
The Daikai subway station of Kobe Rapid Transit System was seriously damaged during the 1995 Hyogokennanbu earthquake. The upper floor was collapsed and the route 28 above the floor was settled. These were caused by failure of the reinforced concrete columns. The test hammer test and the laboratory soil test were carried out to obtain the actual concrete strength and dynamic deformation characteristics of filled soil material. Furthermore, in order to make clear the reason why the structure was damaged, 2 kinds of analysis were conducted. First, dynamic response analysis was carried out. Static analysis considering non linear relationship between the moment and rotational angle at the end of the elements of the structure was carried out in which applied load derived from such sectioanl force as axial and shear force obtained at nodal point. Cracks at the end wall and failure of the columns indicate that severe lateral seismic force applied to the trnsverse section of structure. It is concluded that center columns failed due to bending and shear failure mechanism based on the analysis.
