抄録
The sloshing phenomenon caused by long-period earthquake ground motions has been observed repeatedly in recent years. Overflow of liquid in water tanks often takes place. Damages of water tanks by the East Japan Earthquake of 2011 are the most recent example. In contrast to circular tanks, rectangular tanks show direction-dependent response behavior. In this paper, shaking experiment was conducted to make this effect clear by changing vibration direction. Experimental results suggest interaction of vibration modes.
