津波漂流物大型流木の鉄筋コンクリート防潮堤への衝突に関する検討

抄録

Reinforced concrete seawalls have been constructed in tsunami inundation zones particularly close to nuclear power plants to prevent flooding inside the plant in case of a tsunami event. The potential of very large impact forces due to impact of driftwood is one of the major threats to these seawalls. Damage to the RC walls due to driftwood impact is not well understood because uncertainty in the size and amount of driftwood during a tsunami event. In this study, characteristics of driftwood impact force and damage to RC walls have been investigated using detailed numerical simulations consist of simultaneous as well as sequential impact of driftwood on RC walls. Seawalls which are recently built in nuclear power plants as a countermeasure against tsunamis are subject to compliance with new regulatory standards. The impact resistance performance against drift objects is also an important requirement for the design of a seawall. In this paper, a large driftwood is assumed as a tsunami drifting object, and its soundness is evaluated by impact analysis when the driftwood collides with a reinforced concrete wall equivalent to a seawall.