Marine Structures最新文献_第10页

A probabilistic framework for assessing vessel impact on bridges considering technical failures: insights from the Baltimore accident case study 考虑技术故障评估船舶对桥梁影响的概率框架：来自巴尔的摩事故案例研究的见解

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-08-05 DOI: 10.1016/j.marstruc.2025.103906

Lucjan Gucma , Milan Batista , Marko Perkovič

This article presents new probabilistic approach to assessing the risk of collisions between ships and bridges, focusing specifically on the incident involving the container ship Dali and the collapse of the Francis Scott Key Bridge in Baltimore. Current risk models are significantly limited, particularly given the evolution of navigation practices and the adoption of ultra-precise positioning systems. The proposed method enhances predictive capability by incorporating three categories of technical ship failure: loss of power supply, failure of the main engine, and malfunction of the steering gear. A simulation-based reconstruction of the Dali incident was conducted using the NTPro 6000 full-mission bridge simulator. This reconstruction forms the basis for an in-depth analysis of four critical components: (1) the probable technical cause(s) of the accident; (2) key stakeholders and influencing factors in the risk profile of ship-to-bridge interactions; (3) engineering and procedural options for mitigating bridge strike incidents; and (4) expert assessment of feasible preventive measures, particularly those available to maritime pilots. The study includes the results of a targeted survey of maritime professionals, including pilots and captains. The survey aimed to evaluate the effectiveness of current preventive protocols and to identify potential gaps in training, coordination, and technical response in emergency situations. The findings provide valuable insights into the dynamics of maritime accidents in confined waters and propose a structured approach to enhancing risk assessment methodologies through the use of realistic failure scenarios and expert-informed analysis.

本文提出了一种新的评估船舶与桥梁碰撞风险的概率方法，特别关注涉及集装箱船达利和巴尔的摩弗朗西斯斯科特基桥倒塌的事件。目前的风险模型有很大的局限性，特别是考虑到导航实践的发展和超精确定位系统的采用。该方法将船舶技术故障分为电源中断、主机故障和舵机故障三大类，提高了预测能力。利用NTPro 6000全任务桥模拟器对大理事件进行了基于模拟的重建。这种重构构成了对四个关键部分进行深入分析的基础：(1)事故可能的技术原因；(2)船桥相互作用风险特征的关键利益相关者及其影响因素；(3)减轻桥梁罢工事件的工程和程序选择；(4)专家评估可行的预防措施，特别是可供海上引航员使用的措施。该研究包括对海事专业人员（包括飞行员和船长）的针对性调查结果。调查的目的是评价目前预防性协议的有效性，并查明在紧急情况下培训、协调和技术反应方面的潜在差距。研究结果为密闭水域的海上事故动态提供了有价值的见解，并提出了一种结构化的方法，通过使用现实故障场景和专家信息分析来增强风险评估方法。

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引用次数: 0

Simplified ultimate strength estimation method of continuous stiffened panels under biaxial loads and lateral pressure 双轴载荷和侧压作用下连续加筋板极限强度的简化估算方法

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-07-29 DOI: 10.1016/j.marstruc.2025.103903

Kinya Ishibashi , Daisuke Shiomitsu , Minoru Harada , Masahiko Fujikubo

A simplified method is proposed for estimating the ultimate strength of continuous stiffened panels subjected to combined longitudinal and transverse loads, as well as lateral pressure. For the more rational design of ship hull structures, it is essential to develop an estimation method with a solid physical basis. Previous methods have been developed theoretically, explicitly considering factors such as post-buckling and yielding behaviors in addition to initial deflection. However, these approaches often require numerical iterations, such as the Newton-Raphson method, to obtain the load-deflection relationships. In this study, analytical solutions are derived for the elastic post-buckling behaviors of stiffened panels, eliminating the need for numerical iterations; this enables the development of a simple yet practical method for estimating the ultimate strength. By observing and classifying the collapse behavior of stiffened panels through nonlinear finite element analysis (NLFEA), the ultimate strength can be predicted by assessing yielding at predefined locations corresponding to the identified collapse modes. The accuracy of the proposed method is validated through comparisons with NLFEA results.

提出了一种计算连续加筋板在纵向、横向联合荷载和侧向压力作用下极限强度的简化方法。为了更合理地设计船体结构，有必要开发一种具有坚实物理基础的估算方法。以前的方法是在理论上发展起来的，除了初始挠度之外，还明确考虑了诸如后屈曲和屈服行为等因素。然而，这些方法往往需要数值迭代，如牛顿-拉夫森方法，以获得载荷-挠度关系。在本研究中，推导了加筋板弹性后屈曲行为的解析解，从而消除了数值迭代的需要；这使得开发一种简单而实用的估算极限强度的方法成为可能。通过非线性有限元分析（NLFEA）对加筋板的倒塌行为进行观察和分类，通过评估与确定的倒塌模式相对应的预定位置的屈服来预测加筋板的极限强度。通过与NLFEA结果的比较，验证了该方法的准确性。

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引用次数: 0

Numerical analysis of extreme water slamming damage and residual strength of ring-stiffened columns of a semi-submersible floating offshore wind turbine 海上半潜式浮式风力机环加筋柱极端水击损伤及残余强度数值分析

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-07-28 DOI: 10.1016/j.marstruc.2025.103900

Stina Bjørgo Fimreite , Zhaolong Yu , Jørgen Amdahl , Marilena Greco

Foundation platforms of floating offshore wind turbines (FOWTs) must withstand harsh weather conditions, during which wave slamming is an important loading condition. Slamming is a complex dynamic problem involving fluid–structure interactions (FSI) but is often simplified as simple pressure loads neglecting the coupling effects during design. This paper examines the local structural response of a column of a FOWT floater during slamming, offering deeper understanding of impact dynamics and a measure of accuracy for design methods.

An initial benchmark study on numerical techniques of modeling FSI during water impact of a thin plate was conducted adopting three approaches, i.e. arbitrary Lagrangian–Eulerian (ALE), smoothed particle hydrodynamics (SPH) and incompressible computational fluid dynamics (ICFD). Subsequently, water impact on a ring stiffened cylindrical column of a FOWT floater was investigated using ALE simulations in a range of idealized impact conditions. The structural responses and impact pressures were analyzed, focusing on structural damage evolution. Simplified design methods for predictions of slamming damage were compared with the coupled FSI simulations, using four methods for generating design pressures. Finally, the residual bending strength of the damaged column was determined as an assessment of the consequences of slamming regarding structural integrity.

This paper provides insights into accuracy levels of different numerical techniques for FSI modeling and contributes to efficient design of offshore structures subjected to severe wave slamming.

海上浮式风力发电机组的基础平台必须承受恶劣的天气条件，其中波浪冲击是一个重要的荷载条件。撞击是一个涉及流固耦合的复杂动力问题，但在设计中往往被简化为简单的压力载荷而忽略了耦合效应。本文研究了fot浮子柱在撞击过程中的局部结构响应，为设计方法的准确性提供了更深入的理解和测量。采用任意拉格朗日-欧拉（ALE）、光滑颗粒流体力学（SPH）和不可压缩计算流体力学（ICFD）三种方法，对薄板水冲击过程中FSI数值模拟技术进行了初步的基准研究。随后，在一系列理想冲击条件下，利用ALE模拟研究了水对FOWT浮子环加强型圆柱柱的冲击。分析了结构响应和冲击压力，重点分析了结构损伤演化。采用四种方法生成设计压力，将简化设计方法与耦合FSI模拟进行了比较。最后，确定了受损柱的残余抗弯强度，以评估撞击对结构完整性的影响。本文提供了不同的数值模拟技术的精度水平的见解，有助于有效地设计海上结构的严重冲击。

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引用次数: 0

Torsional and tension–bending analysis of a three-core submarine power cable 三芯海底电力电缆的扭转和拉伸弯曲分析

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-07-26 DOI: 10.1016/j.marstruc.2025.103896

Pan Fang , Xiao Li , Xiaoli Jiang , Hans Hopman , Yong Bai

Submarine power cables (SPCs) are subjected to complex mechanical loadings during service, including tension, bending, torsion, and their combinations. However, systematic studies on the behavior of SPCs – particularly multi-core configurations – under such combined environmental loadings remain limited. This lack of comprehensive analysis hampers a full understanding of their mechanical responses and consequently restricts the design and development of these critical structures. Building upon our previously validated Representative Unit Cell (RUC) model for local mechanical analysis under pure tension and pure bending, this paper extends the investigation to a three-core SPC under a range of combined load cases. In addition, full-scale models are developed to study the torsional response in greater detail. The findings of this study provide valuable guidance for cable engineers, offering new insights into the internal interactions within SPCs and supporting more robust cable design.

海底电力电缆在使用过程中承受着复杂的机械载荷，包括拉力、弯曲、扭转及其组合。然而，对SPCs（特别是多核配置）在这种组合环境负荷下的行为的系统研究仍然有限。这种综合分析的缺乏阻碍了对其力学反应的充分理解，从而限制了这些关键结构的设计和开发。基于我们之前验证的代表单元（RUC）模型，用于纯拉力和纯弯曲下的局部力学分析，本文将研究扩展到一系列组合载荷情况下的三核SPC。此外，还开发了全尺寸模型来更详细地研究扭转响应。本研究的发现为电缆工程师提供了有价值的指导，为SPCs内部相互作用提供了新的见解，并支持更稳健的电缆设计。

引用次数: 0

Second order buckling load of underwater composite cylinder 水下复合材料圆柱体的二阶屈曲载荷

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-07-25 DOI: 10.1016/j.marstruc.2025.103904

Yao Zhu

In this paper, a novel nonlinear second-order buckling load computational method is proposed for underwater composite submersibles using variational principle while solving the effects of nonorthogonal anisotropic constitutive relationship and all linear and nonlinear terms in the discrete Lagrangian strain. For 20 medium-length experimental specimens in the range of 14.11∼68.70 radius-to-thickness ratios, the maximum prediction error of this method is -15.235 %, the minimum prediction error is 0.90 %, and the average prediction error is 6.17 %; the absolute prediction errors are within 10 % for 16 specimens, and within 15 % for 19 specimens. For the 22 experimental specimens in the range of 8.33 ∼ 68.70 radius-to-thickness ratios with length-to-radius ratio increasing up to 24, the maximum prediction error of the method is -18.85 %, the minimum prediction error is 0.90 %, and the average prediction error is 6.98 %; the absolute prediction error is within 10 % for 16 of the specimens, and within 15 % for 20 of the specimens. In addition, this method has good convergence, stability, and angle order immunity. The method improves the prediction accuracy and reduces the prediction error fluctuation range compared with analytical methods and commercial FEM software. The method solves the difficulty that commercial FEM software is unable to predict the buckling loads under classical simply supported boundary condition. Among the total 22 specimens, the prediction results about 19 of them shows conservative results, with the maximum degree of conservatism of -18.85 %, which is within the engineering acceptance range. This is conducive to providing a more adequate safety margin of buckling load for the design of underwater composite submersibles in offshore engineering.

本文利用变分原理，在求解非正交各向异性本构关系和离散拉格朗日应变中所有线性和非线性项影响的基础上，提出了一种新的水下复合材料潜水器非线性二阶屈曲载荷计算方法。对于半径厚度比14.11 ~ 68.70范围内的20个中等长度实验样品，该方法的最大预测误差为- 15.235%，最小预测误差为0.90%，平均预测误差为6.17%；16个标本的绝对预测误差在10%以内，19个标本的绝对预测误差在15%以内。对于半径厚度比为8.33 ~ 68.70，长半径比增加到24的22个实验试样，该方法的最大预测误差为- 18.85%，最小预测误差为0.90%，平均预测误差为6.98%；其中16个标本的绝对预测误差在10%以内，20个标本的绝对预测误差在15%以内。该方法具有良好的收敛性、稳定性和角阶抗扰性。与分析方法和商业有限元软件相比，该方法提高了预测精度，减小了预测误差波动范围。该方法解决了传统简支边界条件下商用有限元软件无法预测屈曲载荷的难题。22个试件中，有19个试件的预测结果较为保守，最大保守度为- 18.85%，在工程验收范围内。这有利于为海洋工程中水下复合潜水器的设计提供更充分的屈曲载荷安全裕度。

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引用次数: 0

Analytical formulation for natural frequency of monopile-supported offshore wind turbine: Calibration and application 单桩支撑海上风力机固有频率解析公式：校准与应用

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-07-23 DOI: 10.1016/j.marstruc.2025.103901

Fangyu Wu , Zhongxuan Yang , Subhamoy Bhattacharya , Rongqiao Xu , Sai Fu

The dynamic response of monopile supported offshore wind turbines (OWT) plays a critical role in their structural design optimization. During the design optimization process, various methods, including numerical simulations and closed-form solutions, are used to analyze the free vibration behavior of monopile-supported OWTs. This study introduces an analytical model based on the Rayleigh-Ritz method to derive a fast yet accurate estimation formula for natural frequencies.

Given the increasing deployment of OWTs in deeper waters with complex seabed conditions prone to scouring, as well as the trend toward larger turbine sizes, the calibrated model and Rayleigh-Ritz formula are applied to assess the effects of scouring on natural frequencies across different turbine scales. The study also examines the relationship between the natural frequencies computed using a fixed-base assumption and the effect of foundation flexibility, accounting for variations in ground conditions. Furthermore, the work explores frequency trends across multiple turbines scales and identifies feasible turbine sizes for deployment in four specific seas of China.

单桩支撑海上风力发电机组的动力响应对其结构优化设计具有重要意义。在优化设计过程中，采用数值模拟和闭式解等多种方法对单桩支承的自振特性进行了分析。本文引入基于瑞利-里兹法的解析模型，推导出快速准确的固有频率估计公式。考虑到owt越来越多地部署在更深的水域，且海底条件复杂，容易发生冲刷，以及涡轮机尺寸越来越大的趋势，应用校准模型和瑞利-里兹公式评估了不同涡轮机尺度上冲刷对固有频率的影响。该研究还考察了使用固定基础假设计算的固有频率与基础灵活性的影响之间的关系，考虑了地面条件的变化。此外，该工作还探讨了多个涡轮机规模的频率趋势，并确定了在中国四个特定海域部署的可行涡轮机尺寸。

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引用次数: 0

Analysis on the mechanical properties of TPJ foundation during scour development under different wave and current parameters 不同波流参数下TPJ地基冲刷发展过程力学特性分析

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-07-23 DOI: 10.1016/j.marstruc.2025.103899

Ning Wang , Ruihu Zhu , Qiming Wang , Siyuan He , Ling Qiu

In order to analyse the changes in the mechanical properties of the tetrapod piled jacket (TPJ) foundation under wave-current during scour development, a scour test is conducted in a wave current flume. This test allows for the simultaneous detection of several key parameters, including the scour depth around the pile, the bending moment of the pile, the displacement of the tower top, and the secant stiffness of foundation. The results demonstrate that the scour depth of the upstream piles is greater than that of the downstream piles due to the shading effect of the upstream pile, which results in a 24.7 % greater bending moment in the upstream pile compared to the downstream pile. The correlation coefficient between the accumulated displacement of the tower top and the scour depth is greater than 0.9, indicating a strong correlation between the two variables. An increase in the strength of the current will lead to a significant increase in the accumulated displacement. The secant stiffness of foundation is mainly affected by the wave-induced pore pressure, scour, and cyclic loading.

为了分析四足桩夹套地基在波浪流作用下冲刷发展过程中力学性能的变化，在波浪流水槽中进行了冲刷试验。本试验允许同时检测几个关键参数，包括桩周冲刷深度、桩身弯矩、塔顶位移、基础割线刚度。结果表明：由于上游桩的遮阳作用，上游桩的冲刷深度大于下游桩，导致上游桩的弯矩比下游桩大24.7%；塔顶累计位移与冲刷深度的相关系数大于0.9，两者相关性较强。电流强度的增加将导致累积位移的显著增加。基础割线刚度主要受波浪孔隙压力、冲刷和循环荷载的影响。

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引用次数: 0

Collapse performance enhancement in the sizing process of ERW pipes produced using edge, double radii, and reverse bending methods 边弯法、双半径弯法和反向弯法生产的ERW管材尺寸加工过程中抗塌性能的提高

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-07-22 DOI: 10.1016/j.marstruc.2025.103905

Phi-Long Tran , Soo-Chang Kang , Jin-Kook Kim

The rising demand for offshore transportation of oil, gas, and derivatives necessitates high-performing pipeline infrastructure. Electric resistance welded pipes, manufactured through cold-forming processes, have become a cornerstone for offshore pipeline systems. This study employs sequential numerical simulations in ABAQUS to model the pipe-forming process and predict collapse pressures—a pivotal design parameter for offshore pipelines. Three forming methods were modeled: reverse bending forming, double radii forming, and edge forming, with roller geometries tailored to each technique. The constitutive model integrated cyclic tension-compression loading, incorporating the Bauschinger effect and strain hardening for precise material representation. The impact of the sizing stage in the pipe manufacturing was analyzed through different sizing ratios and the thickness-to-diameter ratio. Results demonstrated that higher sizing ratios uniformly enhance collapse pressure regardless of the forming method, particularly in pipes with larger t/D values. Among the forming methods, reverse bending forming consistently produced pipes with superior collapse performance. Parametric studies further explored the influence of ovality and stress history on collapse pressure enhancement across sizing ratios.

石油、天然气和衍生品海上运输需求的不断增长需要高性能的管道基础设施。通过冷成形工艺制造的电阻焊管已成为海洋管道系统的基石。本研究采用ABAQUS软件进行序贯数值模拟，对管道成形过程进行建模，并对海上管道的关键设计参数——崩溃压力进行预测。对三种成形方法进行了建模：反向弯曲成形、双半径成形和边缘成形，并针对每种工艺定制了辊子几何形状。本构模型集成了循环拉压加载，结合了包辛格效应和应变硬化，以精确地表示材料。通过不同施胶比和厚径比分析了施胶阶段对管材制造的影响。结果表明，无论采用何种成形方法，较高的施胶比都能均匀地提高管道的坍塌压力，特别是在t/D值较大的管道中。在各种成形方法中，反向弯曲成形始终能生产出具有优良抗折性能的管材。参数研究进一步探讨了椭圆度和应力历史对不同施胶比下坍塌压力增强的影响。

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引用次数: 0

A validated fluid–structure interaction simulation model for vortex-induced vibration of a flexible pipe in steady flow 稳定流动中挠性管道涡激振动的流固耦合仿真模型

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-07-15 DOI: 10.1016/j.marstruc.2025.103895

Xuepeng Fu, Shixiao Fu, Zhibo Niu, Bing Zhao, Jiawei Shen, Pengqian Deng

We propose a validated fluid–structure interaction simulation framework based on the strip method for the vortex-induced vibration of a flexible pipe. The numerical results are compared with the experimental data from three steady flow conditions: uniform, linearly sheared, and bidirectionally sheared flow. The Reynolds number ranges from

1 0^{4}

to

1 0^{5}

. The flow field is simulated based on open-source software OpenFOAM. The solid field is modeled based on the finite element method of the Euler–Bernoulli beam, and fluid–structure coupling is implemented via a weak coupling algorithm developed in MATLAB. The vortex-induced vibration response is assessed in terms of amplitude and frequency, along with the differences in strain. Additionally, wavelet analysis and traveling wave phenomena are investigated. This study presents the first numerical simulation of flexible pipe VIV under bidirectionally sheared flow, validated against experimental data. Compared to uniform and linearly sheared flow, the bidirectionally sheared flow condition leads to more pronounced traveling wave behavior and stronger multi-frequency responses, especially in the in-line direction. The simulation results are directly compared with measured strain data, showing agreement across different flow conditions. The numerical simulation codes and experimental data in this manuscript are openly available, providing a foundation for more complex vortex-induced vibration simulations in the future.

提出了一种基于条形法的柔性管道涡激振动流固耦合仿真框架。将数值计算结果与均匀流动、线性剪切流动和双向剪切流动三种稳定流动条件下的实验数据进行了比较。雷诺数范围为104 ~ 105。流场仿真基于开源软件OpenFOAM。固体场基于欧拉-伯努利梁有限元法建模，流固耦合通过MATLAB开发的弱耦合算法实现。涡激振动响应的评估是根据振幅和频率，以及应变的差异。此外，还研究了小波分析和行波现象。本文首次对双向剪切流作用下柔性管的涡激振动进行了数值模拟，并与实验数据进行了对比验证。与均匀和线性剪切流动相比，双向剪切流动条件下的行波行为更明显，多频响应更强，尤其是在直线方向上。模拟结果与实测应变数据进行了直接比较，在不同的流动条件下显示出一致性。本文的数值模拟代码和实验数据是公开的，为今后更复杂的涡激振动模拟奠定了基础。

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引用次数: 0

New analysis in the preliminary design for LNG and LPG ships LNG和LPG船舶初步设计中的新分析

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures

Pub Date : 2025-07-14 DOI: 10.1016/j.marstruc.2025.103863

Mariano Marcos-Pérez , Javier Jiménez de la Jara , Daniel Precioso , Aurelio Muñoz , M. Victoria Redondo-Neble , David Gómez-Ullate

In recent years, the production of LNG and LPG ships has increased, driven by the increasing demand for natural and petroleum gases. To meet this demand, ship designs must be optimized at all stages, requiring designers to have advanced, efficient and accurate design tools. This study presents new statistical and regression analyses of data extracted from the Hyundai Heavy Industries Shipbuilding Group catalogue which includes information on LNG and LPG ships built between 1979 and 2023. The database includes 145 LNG carriers and 322 LPG carriers, representing approximately 20% of the global gas carrier fleet. Simple and multiple regression analyses were used to estimate dependent variables and their correlation to other ship parameters. In addition, Machine Learning algorithms were trained and compared against these traditional methods. This study provides updated tools to support the preliminary design of LNG and LPG ships, enhancing the understanding and accuracy of early-stage design decisions.

近年来，由于对天然气和石油天然气的需求不断增加，液化天然气和液化石油气船舶的产量有所增加。为了满足这一需求，船舶设计必须在各个阶段进行优化，这就要求设计人员拥有先进、高效和准确的设计工具。该研究对现代重工造船集团目录中提取的数据进行了新的统计和回归分析，其中包括1979年至2023年间建造的液化天然气和液化石油气船舶的信息。该数据库包括145艘液化天然气运输船和322艘液化石油气运输船，约占全球天然气运输船船队的20%。采用简单回归分析和多元回归分析来估计因变量及其与其他船舶参数的相关性。此外，机器学习算法进行了训练，并与这些传统方法进行了比较。本研究为支持LNG和LPG船舶的初步设计提供了更新的工具，提高了对早期设计决策的理解和准确性。

引用次数: 0