[L02] 耐震一般Ⅱ／耐震性能評価Ⅰ

[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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