Abstract
This paper presents failure analysis of underground RC frames. The Hanshin Great Earthquake in 1995 brought serious damage to RC frames for subway stations. For studying the collapse mechanism of underground RC, seismic response of a subway station is simulated in using FEM program WCOMD-SJ of two-dimension based on the path dependent RC smeared crack model, soil foundation and interfacial models. The shear failure of intermediate vertical columns is found to be the major cause of the structural collapse. Further, parametric study on reinforcement ratio and foundation properties is performed for investigating seismic resistant performance for underground RC culverts.
