Impact Load by an Ice Floe against a Structure

浮冰对结构的冲击载荷

• 批准号: 19760349
• 负责人: KIOKA Shinji
• 金额: $ 2.32万
• 依托单位: Public Works Research Institute
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2009
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19760349/
• 关键词: 海氷; 衝撃; 衝突; 個別要素法; 津波; 破壊; 自由落下; 脆性的破壊; 脆性的破壞

We performed medium-scale experiments regarding the impact applied by ice floes against a structure using free-falling ice floes under various conditions. The impact load increased linearly with decreasing ice temperature ; accordingly, it was presumed that the effect of ice temperature on the impact load was larger than that on compressive strength. The impact load was also more strongly influenced by ice temperature than by kinetic energy under the test conditions of this study. When ice causeed brittle failure/splitting, and fragments moved freely after impact with a structure (especially when the ice floe is large compared to the structure), the impact load or the impulse was small compared to cases without failure, and became a constant value regardless of the level of the kinetic energy or the momentum. We also made experiments regarding timbers and steels along with sea ice, considering tsunami-related debris such as timber, containers and vessels. In case of the timbers and the steels without brittle failure, their impact loads were generally one order of magnitude larger than those of sea ice. We also developed a numerical method using DEM to simulate the impact on a structure and its failure, and we obtained a practical tool for estimating an impact load of sea ice.

我们使用各种条件下自由落体的浮冰，进行了有关浮冰对结构物的影响的中型实验。冲击载荷随冰温的降低而线性增加，冰温对冲击载荷的影响大于对压缩强度的影响。在本研究的试验条件下，冰温对冲击载荷的影响比动能更大。当冰引起脆性破坏/分裂，并且碎片在与结构物撞击后自由移动时（特别是当浮冰与结构物相比较大时），与没有破坏的情况相比，撞击载荷或冲量较小，并且无论动能或动量的水平如何都变成恒定值。我们还做了关于木材和钢材沿着海冰的实验，考虑了与海啸有关的碎片，如木材，集装箱和船只。对于未发生脆性破坏的木材和钢材，其冲击载荷一般比海冰大一个数量级。我们还开发了一种数值方法，使用离散元模拟的影响和破坏的结构，我们得到了一个实用的工具，估计海冰的冲击载荷。

项目成果

Medium-scale Test and Numerical Simulation using DEM for the Impact Load by a High Speed Ice Floe against a Structure

高速浮冰对结构冲击载荷的中型试验与数值模拟

• 发表时间: 2009
• 期刊: Proc.20th International Conference on Port and Ocean Engineering under Arctic Conditions 2009 (CD-ROM)
• 作者: S.Kioka;Y.Yamamoto;M.Masaya;T.Takeuchi
• 通讯作者: T.Takeuchi

流氷期の津波来襲を意図した流氷の構造物への衝突に関する中規模実験およびその数値計算手法の基礎的検討

流冰时代流冰对以海啸为目的的结构影响的中尺度实验及数值计算方法的基础研究。

• 发表时间: 2008
• 期刊: 海岸工学論文集 55
• 作者: 木岡信治;森昌也;山本泰司;竹内貴弘
• 通讯作者: 竹内貴弘