Abstract
This paper presents an experimental approach for the damage of reinforced concrete (RC) column model under the vertical earthquake shock. First, the push-up apparatus was newly developed in order to reappear the damage of structure in Hyogo-ken Nanbu earthquake. Second, the push up impact test was performed for the 1/10 RC column model, and the circumferential crack was occurred at the center of column under the conditions of the projectile impact velocity 5m/s and the surcharge weight 49kN. Third, the stress wave was observed by the strain gauges of concrete and steel bar during the time of 0-3ms, but the fracture of concrete column was not occurred due to the stress wave. Fourth, the vibration field was examined by the strain gauges of concrete and steel bar during the time of 3ms-14ms, and it was found that the concrete strain became infinity at the time 11ms. Therefore, it was confirmed that the circumferential crack was occurred by the tensile stress due to the inertia force during the period of the vibration field.
