Safety evaluations of an large offshore structure subjected to dynamic forces

动态力作用下大型海上结构的安全评估

• 批准号: 13650528
• 负责人: KAWANO Kenji
• 金额: $ 2.24万
• 依托单位: Kagoshima University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650528/
• 关键词: large offshore structure; wave and seismic forces; 3-dimensional structure; dynamic safety; uncertainties; reliability evaluation; tidal force; Monte Carlo simulation; 波力と地震; 非線形地震応答解析; シミュレーション; 信頼性指標; 入力の方向性; 動的応答解析; 非線形応答; 不規則外力

Performing the dynamic response evaluations for the offshore structure subjected to wave forces, uncertainties on the characteristics of the structure and wave forces have to take into accounts for the response evaluations. It is very important to evaluate the uncertain parameter effects on the maximum response evaluation for the reliability evaluation. The Monte Carlo simulation (MCS) gives an effective method on the evaluations of the uncertainties. The MCS approach is applied to evaluate effects of the uncertainties on the offshore structure in the present study. It is shown that since the uncertain parameters play the important roles on the maximum response evaluations, it is important for the reliable design of the offshore structure to account for the effects on uncertainty with respect to the response. The main results are summarized as follows :(1)Since the uncertainties with respect to the wave force evaluations play important contributions on the response properties, it is essential for the reliable design of the structure to make it clear the response properties due to uncertainties. For enhancing the safety of the offshore structure subjected to severe wave forces, it is important to account for the uncertain parameter effects.(2)The uncertainties such as the drag coefficient and the inertia coefficient play relatively small effects on the reliability index in the present situation. The other hand, since the variations of the mean wave height ant and mean wave period give important effects on the maximum response evaluation, it is important for the reliable design of the structure to account for the uncertain parameter contributions with respect to reliability index.

在对波浪力作用下的海洋结构物进行动态响应评估时，必须考虑结构物和波浪力特性的不确定性。评估不确定性参数对最大响应估计的影响对于可靠性评估是非常重要的。蒙特卡罗模拟（MCS）为不确定性的评估提供了一种有效的方法。MCS方法被应用于评估的不确定性对海洋结构物在本研究中的影响。结果表明，由于不确定性参数发挥重要作用的最大响应评估，它是重要的海洋结构物的可靠性设计考虑到不确定性的影响，相对于响应。（1）由于波浪力计算中的不确定性对结构响应特性有重要影响，因此明确不确定性引起的结构响应特性对结构的可靠性设计至关重要。为了提高海洋结构物在波浪力作用下的安全性，考虑结构物的不确定性参数影响是十分重要的。（2）阻力系数、惯性系数等不确定性因素在目前情况下对可靠性指标的影响较小。另一方面，由于平均波高和平均波周期的变化给最大响应评估的重要影响，它是重要的结构的可靠性设计，以考虑不确定性参数的贡献相对于可靠性指标。

项目成果

T.Taniguchi, K.Kawano: "Current effects on extreme response value statistics of offshore structures subjected to wave and current"Proc.of the eleventh International offshore polar Engineering Conference. Vol.III. 347-353 (2001)

T.Taniguchi、K.Kawano：“受波浪和海流影响的近海结构的极端响应值统计的电流效应”第十一届国际近海极地工程会议论文集。

T.Taniguchi, K.Kawano: "Designer wave load for application in extreme response of offshore structures"Proceedings of the twelfth international offshore and polar engineering conference. 3. 414-421 (2002)

T.Taniguchi、K.Kawano：“用于海上结构极端响应的设计波浪载荷”第十二届国际近海和极地工程会议论文集。

T.Taniguchi, K.Kawano: "Current effects on extreme response value statistics of offshore structures subjected to wave and current"Proc.of the eleventh international offshore and polar engineering conference. Vol.III. 347-353 (2001)

T.Taniguchi，K.Kawano：“电流对波浪和海流作用下海上结构的极端响应值统计的影响”第十一届国际近海和极地工程会议论文集。

K.Kawano, F.Hashimoto: "Nonlinear dynamic responses of a large offshore structure"Proc.of the eleventh International offshore and Polar Engineering Conferense. Vol.I. 294-300 (2001)

K.Kawano，F.Hashimoto：“大型海上结构的非线性动力响应”第十一届国际近海和极地工程会议论文集。

T.Taniguchi, K.Kawano: "Designer wave and current loads for evaluating extreme responses of offshore structures"Proceedings of the thirteenth international offshore and polar engineering conference. 4. 472-479 (2003)

T.Taniguchi、K.Kawano：“用于评估海上结构极端响应的设计波浪和电流载荷”第十三届国际海上和极地工程会议论文集。