A study on impulsive force of timber drifted by tsunamis

海啸漂流木材冲击力研究

• 批准号: 04650450
• 负责人: MATSUTOMI Hideo
• 金额: $ 1.09万
• 依托单位: Akita University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650450/
• 关键词: Driftwoods; Tsunami; Impulsive force; Elastic wave theory; Elasto-plastic theory; 弾塑性モデル

A procedure is developed for predicting the maximum impulsive force on structures with an arbitrary opening ratio due to the collision of timbers drifted by bore or surge front formed by tsunamis. In the course of the developments, variation features of the apparent inertia coefficient, the moving velocity and the impact duration time of timbers with the opening ratio, the relative bore or surge height and the timber's slenderness ratio are examined, experimentally.Two theories are also developed for estimating the impulsive force on structures due to the collision of timbers drifted by a flow with relatively weak unsteadyness and fluidity compared with bores or surges, based on the elastic wave or elasto-plastic theory. In the former, the elastic wave theory is applied to the timber and the structure, and the mass conservation law and the Bernoulli's theorem are applied to the water which is left between the timber and structure and has a shock absorption function. In the latter, the elasto-plastic theory is applied to the timber, and the angular revolution velocity and the collision angle of the timber and the deflection of the structure are also considered.

本文提出了一种预测任意开度比的结构受到由钻孔漂移的木材或由海啸形成的浪涌锋的碰撞所产生的最大冲力的方法。在发展过程中，试验考察了木材表观惯性系数、运动速度和冲击持续时间随开口比、相对孔高或浪高以及木材长细比的变化特征。基于弹性波理论和弹塑性理论，对非定常性和流动性相对较弱的流对结构的冲击力进行了估计。前者将弹性波理论应用于木材和结构，将质量守恒定律和伯努利定理应用于木材和结构之间具有减震功能的水。后者将弹塑性理论应用于木材，并考虑了木材的角转速和碰撞角以及结构的挠度。

项目成果

松冨 英夫: "塑性を考慮した場合の流木衝撃力" 土木学会東北支部発表会講演概要. 158-159 (1993)

Hideo Matsutomi：“考虑塑性时的浮木冲击力”日本土木工程师学会东北分会的演讲摘要 158-159 (1993)。

松冨 英夫: "水の緩衝機能を考慮した弾性波理論に基づく流木衝撃力の評価" 海岸工学論文集. 39. 691-695 (1992)

Hideo Matsutomi：“考虑水的缓冲功能的基于弹性波理论的浮木冲击力评估”海岸工程杂志 39. 691-695 (1992)。

松冨英夫: "砕波段波に伴う流木の最大衝撃力に関する実験的研究" 土木学会論文集. 19-28 (1993)

松富秀夫：“破碎波浪引起的浮木最大冲击力的实验研究”日本土木工程学会论文集19-28（1993）。

松冨英夫: "構造物の撓み,流木の塑性と衝突角度を考慮した場合の流木衝撃力" 土木学会東北支部発表会講演概要. 166-167 (1994)

Hideo Matsutomi：“考虑结构偏转、浮木塑性和冲击角度时的浮木冲击力”日本土木工程师学会东北分会的演讲摘要 166-167 (1994)。

松冨 英夫: "2本連なった場合の流木衝撃力" 土木学会東北支部発表会講演概要. 164-165 (1993)

Hideo Matsutomi：“两块连续连接时浮木的冲击力”日本土木工程师学会东北分会的演讲摘要 164-165 (1993)。