コンクリート工学年次大会 2013（名古屋）
2013年7月9日〜7月11日名古屋国際会議場
コンクリート工学年次大会 2013（名古屋）
2013年7月9日〜7月11日名古屋国際会議場
[L2141]Evaluation of Bridge Outflow due to Great Tsunami
鄭 玉龍1,幸左 賢二1,佐々木 達生2(1.九州工業大学,2.大日本コンサルタント)
キーワード：
津波、橋梁の流失、抗力係数、β値
Triggered tsunami from the Great East Japan Earthquake caused outflows of many bridges. β (ratio of girder resistance to tsunami impact) of 38 girders were evaluated. There is great difference between β of girders flowed and survived. From modifications using average drag coefficient, β have 20% increase. After revising, flowed bridges with β greater than 1.0 are located in smaller distance to coastal line inducing greater velocities and decrease of β. As representative, β of Koizumi Bridge was modified by velocity by numerical analysis and becomes sufficient to explain the outflow.
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