横型円筒タンクのオーバル振動モードを対象とした加振試験

抄録

The purpose of this study is to confirm the damage progression of a horizontal cylindrical tank until leakage caused by deformation due to the oval vibration mode under a seismic condition. For this purpose, an excitation experiment was conducted on a model of a tank filled with water. The model was made of aluminum alloy with a diameter / thickness ratio of 600. When the tank was at a water depth of 50 %, local plastic deformation occurred because of the excitation, and the shape was deformed due to the oval vibration mode, but no leakage occurred. At a water depth of 90 %, a crack initiated, and the leakage of water was observed. In the tank model applied to this experiment at a water depth of 90 %, it is suggested that the oval vibration mode causes local yielding in the tank body, and that water leakage occurs.