津波避難タワーの耐津波安定性に関する実験的研究

抄録

Tokai, Tonankai and Nankai earthquakes are predicted to generate great tsunamis which will attack the Pacific Coasts. The tsunami will arrive at the coasts within ten minutes after the shaking, and its height reaches 5m or more. To save lives of residents in these affected areas from the tsunami, a shelter tower is newly designed, and it begins to be constructed by the local governments. A hydraulic experiment is performed to check the stability of the shelter tower at exertion of the tsunami. It is confirmed that if there are no debris, the tower is enough stable because tsunami force is smaller than shear strength of the column connections. On the other hand, if the force is increased by debris, overturning moment becomes much larger than the resistant moment by the tower weight without considering the pullout resistance force of the columns. Presuming of tsunami force which acted on land structures such as the tsunami shelter was proposed by using newly derived tsunami velocity equation and the drag coefficient of the structures.