1991 Fiscal Year Final Research Report Summary
Dynamic Behavior of Coastal and Ocean Structures and Its Optimization under Severe Storm Conditions
| Project/Area Number |
02452192
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
土木構造
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| Research Institution | Kumamoto University |
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Principal Investigator |
MIIKE Ryoji Kumamoto University, civil and Environmental Engineering, Professor, 工学部, 教授 (50040374)
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| Co-Investigator(Kenkyū-buntansha) |
KOBAYASHI Ichiro Kumamoto University, civil and Environmental Engineering, Associate Professor, 工学部, 助教授 (40109666)
TAKIKAWA Kiyoshi Kumamoto University, civil and Environmental Engineering, Associate Professor, 工学部, 助教授 (80040450)
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| Project Period (FY) |
1990 – 1991
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| Keywords | Coastal and Ocean Structures / Breaking Wave Force / Finite Amplitude Motion / Wave Force on Structures / Optimization / Moored Floating Body / Breaking Wave / Numerical Simulation |
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| Research Abstract |
1. Research no behavior of coastal structures with legs subjected to breaking wave forces :
(1) Wave force distribution on the surface of the slender leg was estimated by measuring the wave pressure in model with super small type of pressure censors ; Variation of the total wave force was measured by a moment method by strain gauges. An apparatus measuring the local wave force was devised and used so as to illustrate variation of the wave force distribution in time and space. Thus, an equation giving the wave force distribution was proposed, in which impact pressure are taken into consideration in addition to the Morison's formula.
(2) Simulation analysis of the breaking process of waves was performed on the basis of the modified SMAC method in order to examine the physical quantities inside the breaking waves. An numerical model of energy dissipation of the breaking wave was set up, which was caused by rush of water block and turbulence in breaking water. This model simulates the breaki
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ng process of waves in good agreement.
2. Research on behavior of moored floating body under the action of wave forces :
(1) An method of analysis of coupled motion system between waves and floating body was presented.
(2) Dynamic nonlinear analysis of moored lines was developed under sever storm conditions. Various characteristics in finite amplitude movement of the moored floating body subjected to regular and irregular waves were examined.
3. Determination of optimum sections of members of coastal and ocean pipe structures :
An optimal design computation was tried to minimize the volume of a pipe, of which thickness increases an the water depth increases, subjected to the following conditions : (1) The distribution of breaking wave forces was given according to the formula presented by the experiment above ; (2) Minimum value of thickness of the pipe was limited. The design variables were an outside diameter of the pipe and its thickness. The optimum design for space coastal and ocean structures should by researched as the next subject. Less
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