Abstract
Many tower cranes were severely damaged by the Hyogo-ken Nanbu earthquake in 1995. In this paper, the damage of the tower crane was examined. Even the area where the earthquake was not so severe, the tower cranes that erected on the upper floor of the building were collapsed. It was caused that the earthquake power was amplified by the motion of the building. And the natural period of the tower crane was measured by the free vibration tests. From the results, it was found that the natural period of the crane was close to that of the building under construction.
