偶発作用
設計供用期間中に生じる可能性は低いものの、一時度生じると構造物又は部材に重大な影響を及ぼすと考えられる作用（津波、レベル2地震動、漁船の衝突、火災等）をいう。
漁港・漁場の施設の設計参考図書 – 7 – (水産庁 2015年版[上])
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