A Theoretical and Numerical Study on Seaquakes on a Floating Body

浮体地震的理论与数值研究

• 批准号: 08455477
• 负责人: HIGO Yasushi
• 金额: $ 2.62万
• 依托单位: HIROSHIMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455477/
• 关键词: seaquake force; Boundary Integral Equation; Green function; two-dimension; three-dimension; time domain solver; 二次元時間領域解法

The seaquake forces acting a floating body were calculated numerically byusing two-dimensional and three-dimensional BIEM,and two-dimensional time domain solver. The effects of marine sediment were also investigated. The results may be summarized as follows :1) There are resonances corresponding to the eigen value of the boundary problem on the seaquake forces.2) The inteval of resonat frequencies become smaller with the increase of the index of refraction between sea-water and marine sediment.3) The interval of resonat frequencies become smaller with the increase of the marine sediment's thickness.4) The floating structure may be constructed in the ocean area, where the marine sediment' thickness is thin, from an aseismatic point of view.5) The magnetude of seaquake forces at resonance in three-dimension are not larger than those in two-dimension because of wave spreading.6) The structure safty must be paied attention, when the earthquake occurs beneath the structure.7) The instantaneous large seaquake force may act on the structure in transient condition.8) The elastic body may vibrate largely in some special conditions by the seaquake.

利用二维、三维BIEM和二维时域求解器对浮体地震力进行了数值计算。研究了海洋沉积物的影响。结果表明：1)地震力边界问题的本征值存在共振。2)共振频率的间隔随着海水与海洋沉积物之间折射率的增大而减小。(3)随着沉积物厚度的增加，共振频率的间隔逐渐变小。4)从地震角度看，在海相沉积物厚度较薄的海域，可以建造浮式结构。5)由于波浪的传播作用，三维共振地震力的强度并不大于二维共振地震力的强度。6)当结构下部发生地震时，必须注意结构的安全。7)结构在瞬态状态下可能受到瞬时大地震力的作用。在地震的某些特殊条件下，弹性体可能产生较大的振动。

项目成果

Y., HIGO et al.: "A Theoretical Study on the Effect of Seaquakes on a Floating Body" Transactions of The West-Japan Society of Naval Architects. No.93. 111-118 (1997)

Y.、HIGO 等人：“关于地震对浮体影响的理论研究”西日本造船学会会刊。

Yasushi Higo: "A Study on the Effect of Seaquakes on a Flcating Body" Proceedings of 3rd KOREA-JAPAN Joint Workshop on Ship & Marine Hydrodynamics. 269-276 (1996)

Yasushi Higo：“海震对浮体影响的研究”第三届韩日船舶联合研讨会论文集

Y., HIGO et al.: "A Study on the Effect of Seaquakes on a Three-Dimensional Floating Body" J.of SNAJ. No.182. 375-380 (1997)

Y.、HIGO 等人：“地震对三维浮体影响的研究”J.of SNAJ。

肥後 靖: "海震によって三次元浮体に働く荷重に関する研究" 日本造船学会論文集. 第182号. 375-380 (1997)

Yasushi Higo：“海上地震对三维浮体施加的载荷的研究”日本造船学会汇刊第 182. 375-380 (1997)。

肥後 靖: "地盤の変化が海震荷重に及ぼす影響に関する理論的研究" 関西造船協会誌. 第229号. 123-128 (1998)

Yasushi Higo：“地面变化对海上地震载荷影响的理论研究”关西造船协会杂志第229. 123-128（1998）。