Marine Structures最新文献

{"title":"Structural integration of glass in yacht superstructures through adhesive bonding – A numerical analysis","authors":"Danie Wium ,&nbsp;Evert Lataire ,&nbsp;Jan Belis","doi":"10.1016/j.marstruc.2025.103834","DOIUrl":"10.1016/j.marstruc.2025.103834","url":null,"abstract":"<div><div>Large luxury yachts often include expansive windows in their designs. The current method of bonding the glass window panes to the supporting structure using a flexible adhesive often necessitates reinforcement in the metallic structure as window size increases. This paper explores an alternative solution where glass is structurally integrated into the yacht. The challenges of integrating glass using structural adhesive bonding is investigated using finite element analysis, focusing on yacht loads and structural deformation. A novel yacht concept with an expansive glazing structure is utilized for this investigation. Following a global load analysis, it is concluded that the glazing structure plays a near negligible role in global strength. Subsequently, a parametric study of the glazing structure is performed under local yacht loads, considering different adhesive bond stiffnesses and glass panel thicknesses. The adhesive bonds are modelled using a contact function with cohesive behaviour. An adhesive Young’s modulus ranging from 500 MPa to 2000 MPa resulted in acceptable stresses and deflections of the glazing structure. A submodel of a region of the glazing structure is created for a more realistic representation of the adhesive material. The geometry of the adhesive significantly affects the magnitude and distribution of stresses within the adhesive material, which the contact function underestimates. Stresses in the adhesive are compared to the strengths of an epoxy adhesive with similar elasticity, but stresses are close to the epoxy’s limits. It was also found that the curvature of the glazing structure plays a role in the deformations experienced by the adhesive bonds.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103834"},"PeriodicalIF":4.0,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Statistical characterization on slamming and green water impact onto a chemical tanker in extreme sea conditions","authors":"Shan Wang ,&nbsp;C. Guedes Soares","doi":"10.1016/j.marstruc.2025.103818","DOIUrl":"10.1016/j.marstruc.2025.103818","url":null,"abstract":"<div><div>Characteristics of slamming and green water impact onto a chemical tanker in extreme waves are investigated using statistical analysis based on the model test data. Three extreme wave sequences which contain single real-world waves, the New Year wave, Three sisters waves and Yura wave are considered. The temporal variation of the wave surface elevation generated in the tests, along with the measured heave, pitch motions, and vertical bending moments amidships, are compared and analysed in relation to the probability of exceedance for the maxima and minima. The Weibull and Generalized Extreme Value (GEV) models are used to fit the peaks. Slamming pressures on various locations are discussed by comparing the time signals and analysing the peaks using the analytical distribution models for the three extreme waves. The green water column height and associated loading on the deck are presented and compared as well. Discussions are also provided for the results of slamming and green water impacts for the ship with a medium forward speed in the New Year waves. Statistical values including the largest peak, the mean of 1/10th, and 1/3rd highest value of the identified peaks on the pressures are calculated. In addition to the temporal variation of the slamming pressures, the statistical values of the peaks on 32 locations (26 on the bow and 6 on the stern) are calculated, providing insights on both the time variations and the distributions of the pressures.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103818"},"PeriodicalIF":4.0,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The inversion investigation of wave slamming response of air cushion vehicle skirt airbags based on mode superposition method","authors":"Junhong Wei ,&nbsp;Shengjie Xu ,&nbsp;Yuchao Yuan ,&nbsp;Wenyong Tang","doi":"10.1016/j.marstruc.2025.103821","DOIUrl":"10.1016/j.marstruc.2025.103821","url":null,"abstract":"<div><div>Air cushion vehicle (ACV) skirt airbags frequently encounter direct wave slams, which involve large deformations and complex gas-liquid-solid three-phase coupling. The direct slamming energy will break diverse sensors, bringing huge difficulty to accurately monitor the dynamic response among slamming areas. To effectively derive the dynamic behavior of ACVs under wave slamming, this paper identifies the response of the limited monitoring points outside the slamming area, then inverses the skirt airbag slamming response based on modal superposition and the least squares method. Firstly, a 3D finite element model of the skirt airbag is developed. The control volume method is used to simulate the inflated-forming process, and the overall modes database of the airbag is obtained. Next, based on the load forms, modal characteristics, and response features, the monitoring point arrangement and fundamental modal selection are determined. Finally, the inversion algorithm is employed to update modal weight factors in real time then superposing them to predict the focused response in the slamming areas. The proposed inversion method is applied to different scenarios with both symmetrical and asymmetrical loads, to verify the stress response prediction accuracy. The error between the inverted response and the actual response remains almost within 10 %, and the inversion method shows good numerical stability. The inversion method is convenient to implement with a friendly computation time and provides valuable insights for the consequent investigation into the complicated dynamic behaviors of ACV flexible airbags under actual marine environments.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103821"},"PeriodicalIF":4.0,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143858973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultimate bearing capacity analysis of reinforced butt joints of large marine composite structures: Numerical optimization and experimental verification","authors":"Zishuo Wang ,&nbsp;Lifei Song ,&nbsp;Jiwei Huang ,&nbsp;Lin Xu ,&nbsp;Wei Shen ,&nbsp;Mengzhen Li ,&nbsp;Yaoyu Hu","doi":"10.1016/j.marstruc.2025.103814","DOIUrl":"10.1016/j.marstruc.2025.103814","url":null,"abstract":"<div><div>With the increasing use of composite materials in large ship structures, bonded joints have become a crucial component of hull connection structures. This paper investigates the ultimate load-bearing capacity and failure mechanisms of large adhesive joints in stiffened composite sandwich structures. Full-scale experiments and numerical simulations are conducted to analyze the ultimate strength, strain distribution, and displacement behavior of the joints under various loading conditions. An improved progressive damage analysis method, combined with a cohesive zone model, is proposed to accurately predict the failure process and load-bearing capacity of the bonded joints at each stage. The impact of key factors, such as the overlapping width and reinforcement thickness, on the structure's bearing capacity is quantitatively analyzed. The findings offer valuable insights for optimizing the design and improving the efficiency of large-scale composite adhesive joints in marine applications.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103814"},"PeriodicalIF":4.0,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Winkler springs for laterally loaded bucket foundations","authors":"Xinyi Huang,&nbsp;Rui He","doi":"10.1016/j.marstruc.2025.103830","DOIUrl":"10.1016/j.marstruc.2025.103830","url":null,"abstract":"<div><div>Bucket foundations are considered to be environmentally friendly foundations. Their stiffness determines the resonant frequencies and fatigue life of the supported offshore wind turbines. This study proposes a rigorous three-dimensional (3D) elastic solution for the stiffness of laterally loaded bucket foundations in different soil profiles. The lumped spring stiffness acting on the top of the bucket and the exact distribution of the distributed soil spring stiffness along the bucket are first obtained from the analytical model. Closed-form formulae for the lumped spring stiffness are then fitted and verified with the existing studies. To facilitate the engineering application, the distributed soil spring stiffness is then averaged to a uniform distribution using the equivalent work method. Two types of simplified Winkler models are finally proposed and calibrated: one in which the spring stiffness is uniformly distributed along the bucket, and the other in which the distributed Winkler springs are divided into two parts bounded by the centre of rotation. The non-dimensional Winkler springs are mainly related to the bucket aspect ratio, the soil Poisson's ratio and the loading height. It is shown that the lateral soil springs alone, as <span><math><mrow><mi>p</mi><mo>−</mo><mi>y</mi></mrow></math></span> springs for piles, are not sufficient for bucket foundations. The combined two-part <span><math><mrow><mi>p</mi><mo>−</mo><mi>y</mi></mrow></math></span> springs and uniform rotational springs are suggested to obtain accurate bucket foundation responses.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103830"},"PeriodicalIF":4.0,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143855949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Implementation of seismic soil-structure interaction in OpenFAST and application to an offshore wind turbine on jacket structure","authors":"Amir M. Kaynia ,&nbsp;Daniel Martens Pedersen ,&nbsp;Henrik Askheim ,&nbsp;Carlos Romero-Sánchez","doi":"10.1016/j.marstruc.2025.103832","DOIUrl":"10.1016/j.marstruc.2025.103832","url":null,"abstract":"<div><div>One of the challenges in design of offshore wind turbines (OWTs) is that the analyses are performed using specialized software dedicated to hydro-aero-servo-elasto-dynamic analyses which often cannot rigorously perform seismic soil-structure interaction (SSI) analyses. This work presents a methodology to extend these tools to include seismic SSI analyses in these tools with a specific application in the open source OWT analysis tool OpenFAST. The developed method is applied to 10 MW offshore wind turbine on a jacket structure founded on piles. The SSI is implemented using a multi-step sub-structuring method. The method is based on the SSI stiffness and kinematic interaction. The jacket base is attached to pile foundation springs, and excited by forces calculated from the pile-head motions during the earthquake. The spring stiffness and pile-head motions can be determined using well-established methods. In this, they are obtained using the finite element program Abaqus. A complementary integrated Abaqus model of the jacket and tower is then used to verify the implementation of the multi-step method in OpenFAST. The IEA 10 MW reference OWT established in the European research project INNWIND is used in the verification. Using the developed model, the study then attempts to investigate some of the characteristic earthquake responses of the OWT structure. Simulations show how the top of tower displacements are dominated by the wind-induced forces during production form the rotor-nacelle-assembly, while the tower top accelerations and base overturning moments are dominated by the earthquake-induced loads.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103832"},"PeriodicalIF":4.0,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143847477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Probabilistic analysis of the pipeline embedment in spatially variable clay","authors":"Fei Liu ,&nbsp;Po Cheng ,&nbsp;Jiang Tao Yi ,&nbsp;Chao Fan Liu ,&nbsp;Jun Hu ,&nbsp;Yu Zhou Sun ,&nbsp;Zhi Ming Jia","doi":"10.1016/j.marstruc.2025.103829","DOIUrl":"10.1016/j.marstruc.2025.103829","url":null,"abstract":"<div><div>Offshore pipelines are generally laid directly on the seabed without any additional stabilization measures. The pipeline embedment is an important factor that determines the resistance of soil in the axial and lateral movement of the pipeline during operation. Although natural soil properties show considerable spatial variability, the majority of existing studies on pipeline embedment are deterministic. This study shows a probabilistic analysis of the pipeline embedment in the randomness soil using three-dimensional large-deformation random finite-element calculations with the Monte Carlo framework. The results indicate that the randomness of soil strength not only affects the failure mechanisms during the pipeline penetration process but also alters the pipeline penetration resistance. The mean penetration resistance in the randomness soil is less than the deterministic value. Consequently, deterministic analysis may lead to a non-conservative solution without considering soil spatial variability. The required safety factor (<span><math><mrow><mi>S</mi><mi>F</mi></mrow></math></span>) is 2.0 to ensure that the failure probability (<span><math><mrow><mi>F</mi><mi>P</mi></mrow></math></span>) of the pipeline embedment is no &gt;0.1 %. Finally, a methodology is proposed for determining the <span><math><mrow><mi>S</mi><mi>F</mi></mrow></math></span> corresponding to different levels of <span><math><mrow><mi>F</mi><mi>P</mi></mrow></math></span> considering soil spatial variability. This is likely beneficial for engineers to evaluate the <span><math><mrow><mi>F</mi><mi>P</mi></mrow></math></span> for the deterministic design of the pipeline embedment according to the <span><math><mrow><mi>S</mi><mi>F</mi></mrow></math></span>.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103829"},"PeriodicalIF":4.0,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143843775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An analytical model for dynamic responses of one operating offshore wind turbine structure supported by bucket foundation","authors":"Yuchao Li ,&nbsp;Xiaofeng Dong ,&nbsp;Jijian Lian ,&nbsp;Xu Yang ,&nbsp;Zhuo Miao","doi":"10.1016/j.marstruc.2025.103831","DOIUrl":"10.1016/j.marstruc.2025.103831","url":null,"abstract":"<div><div>Recently, the bucket foundation has gained prominence in offshore wind farm (OWF) due to their superior bearing capacity and lower costs. However, higher towers and larger blades may pose significant vibration safety issues to offshore wind turbine (OWT) structures when OWFs continue developing towards deep-sea areas. It is increasingly crucial to accurately simulate the dynamic response of OWT supported by bucket foundation with the current challenges, including the need to corroborate finite element simulations with actual measurement data and the consideration of bucket-soil interaction and dynamic stiffness. In this research, a analytical model of dynamic responses for one operating OWT supported by bucket foundation was firstly established based on the multi-degree-of-freedom vibration theory. In response to the limitations of existing models, a novel bucket-soil interaction model was introduced considering the dynamic changes in foundation stiffness under external excitation and the influence of soil inside the bucket. The global model simulated wind loads, operational loads, and aerodynamic damping, and the Crayfish Optimization Algorithm (COA) was applied to correction formula of aerodynamic damping based on the measurement data. Furthermore, its accuracy was validated in both shutdown and operating modes by comparing the displacement and acceleration responses at the tower top. Finally, the structural responses were studied under extreme conditions such as earthquakes, wind, waves, and typhoons. It is concluded that the observed response growth trends of the tower-top displacement and acceleration of the established model are consistent with the actual trends observed in the prototype under the operating and shutdown conditions. In operating mode, the average deviations of the displacement and acceleration between the analytical model and the actual OWT structure are 7.18 % and 4.14 %, respectively. The model is suitable for OWT response analysis under seismic intensities below 0.3 g and typhoon of return period of 20 year. It is indicated that the proposed analysis model has good engineering application value for the vibration response simulation of actual OWT.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103831"},"PeriodicalIF":4.0,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143833553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CFRP-patch sizing for strengthening perforated steel tubular structures","authors":"Irving D. Hernández ,&nbsp;Murilo A. Vaz ,&nbsp;Julio C.R. Cyrino ,&nbsp;Jorge L. Martinez ,&nbsp;Victor D. Torres ,&nbsp;Gabriel S. Lopes ,&nbsp;Valber A. Perrut ,&nbsp;Gustavo G. de Paula","doi":"10.1016/j.marstruc.2025.103827","DOIUrl":"10.1016/j.marstruc.2025.103827","url":null,"abstract":"<div><div>The use of statistical and non-parameter-based modeling approaches to size a CFRP-patch thickness to restore the intact compressive capacity of perforated steel tubular structures is examined in this paper. Firstly, the effect of the perforation is assessed using non-linear FEM simulations of full-scale tubular structures with multiple levels of slenderness and cutout sizes. Secondly, the contribution of the CFRP-patch to the strengthening of damaged structures is evaluated using a full-factorial design-of-experiment of FEM-models that vary both the ultimate compressive strength and the elastic modulus of the CFRP properties in the longitudinal direction to properly populate a database with the models’ responses. Thirdly, a dataset with thicknesses that restore each damage case's observations to their intact capacity is created. This was accomplished using an ensemble learning method applied to the responses database to estimate the proper CFRP-patch thickness while considering a Hashin's damage criterion level. Finally, a multilinear regression methodology is adopted to describe the dataset, based on the sample and CFRP-patch explanatory variables as well as the Akaike information criterion to fit a model of response surface for the suggested thicknesses. The response predictions from simulated samples with suggested thicknesses are then compared with the ones retrieved from their respective intact models to assess the fitted model's level of effectiveness. Responses from strengthened samples are comparable to those obtained from intact samples, indicating that the fitted model for inferring the CFRP-patch thickness can suggest suitable values of thickness to recover the intact capacity of the samples with ±3 % deviation range.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103827"},"PeriodicalIF":4.0,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143833357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the wrinkling of liner with elliptical defects in lined pipes under axial compression","authors":"Zhan-Feng Chen ,&nbsp;Yi-Fan Liang ,&nbsp;Lin Yuan ,&nbsp;Yi Shuai ,&nbsp;Wen Wang","doi":"10.1016/j.marstruc.2025.103822","DOIUrl":"10.1016/j.marstruc.2025.103822","url":null,"abstract":"<div><div>Transporting corrosive hydrocarbons using the lined pipe is an economical method and has been widely applied in onshore and offshore pipeline systems. However, initial ovality is inevitable in the liner during manufacturing, which can affect the mechanical properties and service life of lined pipes. In this paper, a new lined pipe model considering the initial elliptic defects of the liner is established, and the effect of initial elliptic defects on the liner wrinkling is analyzed by the finite element method. The wrinkling behavior of lined pipes with perfect and elliptic liners under axial compression is studied and compared. Results show that the contact stress on the lined pipe is uneven, and the extent of nonuniformity increases as the ellipticity increases. A large ellipticity can weaken the lined pipe's load-carrying capability. Results also indicate that the liner wrinkling in the lined pipe is sensitive to the initial elliptic defects.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103822"},"PeriodicalIF":4.0,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143826375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}