Abstract
This paper presents an experimental approach for the appearance of circumferential crack phenomena of reinforced concrete (RC) pier model by the Hanshin-Awaji Great Earthquake. First, the new push-up apparatus was developed and the vertical motion was applied by using both push-up apparatus and high speed loading machine. Second, in order to examine the failure modes due to circumferential crack, the push-up impact test was performed for reinforced concrete columns and the experimental results were discussed on the accelerations, velocities and strains of concrete and reinforcing bar. Third, the circumferential crack of specimen was recorded by the high-speed video. Finally, the input velocity of the actual RC piers occurred circumferential crack at Hanshin area was estimated by a similar law.
