Abstract
The equivalent vibration system for water in TLD is useful in calculating earthquake responses of the structure installed with TLD. This system is already well known concerning the horizontal vibration of rectangular and cylindrical TLD. When a structure whose rigidity and gravitational axis do not correspond is struck by earthquakes, TLD vibrates around vertical axis with the structure. In this paper, the equivalent vibration system is obtained theoretically when rectangular TLD vibrates around vertical axis. Then, the values of the system for water in rectangular TLD are obtained by experiments. Finally, the validity of the theoretical expressions is shown.
