On collapse of Daikai subway station due to the 1995 Kobe earthquake - numerical simulation in case of thrusting up at lower grand layer -

Abstract

At Great Hanshin Awaji Earthquake occurred on Jun. 17, 1995, many infrastructures suffered severe damage. The central pillars in the Daikai-subway station circumferentially cracked and/or axially crashed from the lower part. These damage may not be due to horizontal earthquake motion but due to vertically transmitted thrust-up wave. In this paper, to numerically recreate a similar damage situation, elasto-plastic dynamic response analysis for the station model was carried out by thrusting up the level of the bottom of the base slab including ground layer. From this study, it is identified that circumferential crack and vertical crash of the pillars at the quake can be recreated numerically due to thrusting up during 5 ms with the velocity of 200 kine and 400 kine, respectively.