A Study on Structural Response Behavior and Strength Evaluation Systems of Submerged Floating Structures with Tension Legs in Waves

波浪中张拉腿水下浮体结构响应行为及强度评价体系研究

• 批准号: 13450411
• 负责人: OKADA Hiroo
• 金额: $ 5.38万
• 依托单位: Osaka Prefecture University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13450411/
• 关键词: Submerged floating structures; Strength of tension legs; Bending (cracking) failure; Reliability analysis system; Parameter sensitivity analysis; Fatigue behavior of steel materials; Hydroelastic behavior of box girder; Collapse behavior of circula

(1) The first research is concerned with the elastic response behavior of marine tunnel structures with tension legs in irregular waves. First, a simplified estimation method for dynamic responses under regular oblique wave conditions is analytically presented using a simple beam on an elastic foundation. Then, a simplified estimation method is presented for the dynamic behavior under irregular wave conditions by using above analytical results and combining irregular sea wave spectra. Next, the limit state mode is presented for estimating the reliability level for cracking failure of the main body under extreme wave loads. Finally, the applicability of the methods is investigated through numerical examples carried out for a 1,000m-class marine tunnel structure with tension legs under some irregular sea state conditions. And characteristics of the short-term responses and reliability levels for the cracking failure of the main body were numerically shown. Effects of the critical moment … More for cracking failure and bending and mooring rigidities concerning with the expected value of the maximum bending moment on reliability levels are also investigated by sensitivity analysis.(2) Next, the hydro-elastic characteristics of a submerged floating structure supported with tension legs in regular waves is investigated under some assumptions of the linear long wave theory and thin plate theory. Then, the hydro-elastic characteristics of a floating structure model with a submerged plate and tension legs in regular waves are investigated numerically. Next, in order to demonstrate the validity of theoretical results, an experimental study was carried out for a basic model in regular waves. It is found that experimental results for the frequency response amplitude were in good correspondence to theoretical results in the low frequency range. Finally, numerical studies are carried out for a 1,000m-class submerged floating structure whose was composed of double hull structure under trial design. From analytical results, characteristics of the frequency response amplitude for deflection and bending stress of the structure are investigated.(3) In order to investigate fatigue behavior of steel materials under triple repeated stress, characteristics of behaviors on temperature and hysteresis-loop energy are experimentally investigated. The relation between fatigue life and these behaviors is considered using these experimental results.(4) The effect of pre-strain on fatigue behavior of steel materials under perfectly repeated stress is experimentally investigated. From these results, the relation between fatigue life and behaviors on temperature and hysteresis-loop energy is considered.(5) As a part of basic study on the collapse behavior of marine pipeline structures, effects of combined loads and partially reduced thickness due to corrosion on collapse behaviors of circular tubes under combined with bending moment and lateral pressure are numerically investigated by using a non-linear finite element method. Less

(1)首次研究了带张拉支腿的海洋隧道结构在不规则波浪中的弹性响应行为。首先，利用弹性地基上的简支梁，解析地给出了规则斜波条件下动力响应的简化估算方法。在此基础上，利用上述分析结果，结合不规则海浪谱，给出了不规则波浪条件下动力特性的简化估算方法。在此基础上，提出了极限波作用下船体开裂失效可靠度评估的极限状态模式。最后，通过对某1000m级张拉支腿海洋隧道结构在非规则海况下的数值算例，验证了该方法的适用性。给出了车身开裂失效的短期响应特征和可靠度水平。临界矩…的影响其次，在线性长波理论和薄板理论的假设下，研究了规则波中张力腿支承的水下浮式结构的水弹性特性。在此基础上，数值研究了规则波作用下具有浮板和张力支腿的浮体模型的水弹性特性。其次，为了验证理论结果的正确性，对规则波中的一个基本模型进行了实验研究。结果表明，在较低的频率范围内，频率响应幅值的实验结果与理论结果吻合较好。最后，对正在试验设计的双壳结构的1000m级水下浮式结构进行了数值研究。根据分析结果，研究了结构挠度和弯曲应力的频率响应幅值特性。(3)为了研究钢材料在三重重复应力作用下的疲劳行为，对其温度特性和滞回能量特性进行了试验研究。利用这些试验结果分析了疲劳寿命与疲劳性能之间的关系。(4)试验研究了完全重复应力作用下预应变对钢材料疲劳性能的影响。作为海洋管道结构倒塌行为基础研究的一部分，采用非线性有限元方法研究了复合荷载和腐蚀减薄壁厚对圆管在弯矩和侧压力共同作用下倒塌行为的影响。较少

项目成果

S.Katsura, H.Okada, et al.: "A Study on Structural Response Behavior of Long Floating Structures with Submerged Plates and Tension Legs in Regular Waves"Proceedings of Techno-Ocean 2002 (Kobe, Japan). (CD-ROM)(to appear). TA-5 (2002)

S.Katsura、H.Okada 等人：“规则波浪中带有浸没板和张力腿的长浮式结构的结构响应行为研究”Techno-Ocean 2002 年论文集（日本神户）。

S.Katsura, H.Okada, et al.: "A Simplified Method for Response Behavior and Reliability Analysis of Long Submerged Structures with Tension Legs"Proceedings of OMAE2002 (0slo, Norway). (CD-ROM). OMAE2002-28433 (2002)

S.Katsura、H.Okada 等人：“带张力腿的长水下结构的响应行为和可靠性分析的简化方法”OMAE2002 会议记录（0slo，挪威）。

Shinji Katsura, Hiroo Okada, et al.: "A Simplified Method for Response Behavior and Reliability Analysis of Long Submerged Structures with Tension Legs"Proceedings of OMAB 2002 (Oslo, Norway). to appear. (2002)

Shinji Katsura、Hiroo Okada 等人：“带张力腿的长水下结构的响应行为和可靠性分析的简化方法”OMAB 2002 年会议记录（挪威奥斯陆）。

S.Katsura, H.Okada, et al.: "A Study on Structural Response Behavior of Long Floating Structures with Submerged Plates and Tension Legs in Regular Waves"Proceedings of Techno-Ocean 2002 (Kobe, Japan). (CD-ROM). TA-5 (2002)

S.Katsura、H.Okada 等人：“规则波浪中带有浸没板和张力腿的长浮式结构的结构响应行为研究”Techno-Ocean 2002 年论文集（日本神户）。

桂 信二, 岡田博雄 他: "緊張係留式長大没水構造体の不規則波浪中応答と構造信頼性評価の一方法"日本材料学会第19回材料・構造信頼性シンボジウム 講演論文集. 5-10 (2002)

Shinji Katsura，Hiroo Okada等：“张力系泊长水下结构的不规则波响应和结构可靠性评估方法”第19届材料与结构可靠性研讨会论文集，日本材料学会，5-10。