Ultimate load capacities of mooring bollards and hull foundation structures

Cho, Sang-Rai; Choung, Joonmo; Oh, Chang-Min; Lee, Kangsu; Kim, Jung-Yeob

doi:10.1016/j.oceaneng.2010.02.011

Cited by 4 publications

(2 citation statements)

References 1 publication

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“…Untimely failures in those bollards can precipitate excessive repercussions, encompassing material harm, operational disruptions, and, in the direst instances, jeopardizing the safety of individuals and their surroundings. The evaluation of metal bollard failures requires a complete comprehension of the mechanical traits of the employed materials, the carried out provider masses, and the stresses borne through those additives [1,2]. Additionally, considerations should extend to factors along with corrosion, fatigue, and the intricacies of structural layout.…”

Section: Introductionmentioning

confidence: 99%

Failure analysis and Mechanical Behaviour of A60 steel Bollards Used In Port Infrastructure

El Kouifat,

Zniker,

Feddal

et al. 2024

International Journal of Applied Mechanics and Engineering

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The failure mechanisms and mechanical properties of bollards present significant risks in port and maritime engineering thereby calling for a thorough investigation into these aspects. This study highlights the significance of elements like tensile strength shear stress and service loads while examining the difficulties related to metal bollard failures. This paper presents a case study on A60 steel bollards that combines numerical simulations with experimental testing using Catia and Mathcad software. The results reveal that even as the mechanical houses adjust with A60 steel standards, under accurate ambit and a hundred-ton load, compactness and shear stresses exceed the limit attrition of the bollard. The acceptable strain considerably surpasses the adaptable limit, advertence impending failure. The analysis recommends layout adjustments, presenting a higher array of the annular part of the demonstrated bollard and a safety factor of at least 1. 5 to boost the bollard attrition and forestall hurt under a hundred-ton load. This research contributes advantageous insights into bollard layout, acclamation real- global demanding situations, and promoting safety in maritime infrastructure.

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Section: Introductionmentioning

confidence: 99%

Failure analysis and Mechanical Behaviour of A60 steel Bollards Used In Port Infrastructure

El Kouifat,

Zniker,

Feddal

et al. 2024

International Journal of Applied Mechanics and Engineering

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“…For fixed bollards, a real-time inversion method and a method of monitoring the standard mooring force based on multi-point strain information fusion was proposed by Wu et al [32], which can satisfy the need for monitoring the mechanical safety of bollard structures under complex mooring conditions. Cho et al [33] showed that the ultimate bearing capacity of a bollard under a mooring force could not be significantly improved by strengthening the bollard, and they suggested that the structural resistance of the bollard could be improved by enhancing the material properties and improving the casting process of the structure.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Inversion Model of the Mooring Force on a Floating Bollard of a Sea Lock

Xiang

Shu³

et al. 2023

JMSE

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Sea locks that connect inland canals and rivers to the open sea are crucial links that ensure the efficient navigation of ships. Floating bollards (FBs) are significant components of sea locks, and they are affected by factors such as large ships, speed of entry, and irregular mooring lines coupled with corrosion by chloride salts from seawater intrusion from the environment. These factors aggravate damage to metal structures, which seriously threatens the safety of FBs. Overloading of FBs by mooring forces caused by the illegal use of FBs for the braking of large ships that enter locks at excessive speed is the main cause of structural damage and overload failure for FBs. Controlling the dynamic mooring force acting on the FB is an important prerequisite to ensure the safe passage of a ship through a lock. It is impossible to perform real-time monitoring of the magnitude and direction of the mooring force on an FB by installing load-measuring equipment on the mooring line. Therefore, in this study, the structure of an FB in a sea lock project was taken as an example, and the mathematical relationships between the strain in the load-sensitive area of the FB and the mooring force and the mooring angle were quantified. A dynamic inversion model of the ship mooring force on an FB was proposed. This model used real-time feedback from the strain signal in the load-sensitive region of the FB structure to obtain information about the mooring force. The accuracy of the model was verified by conducting tests with a physical model of the topside structure of the FB and comparing the predicted results with the test data. The research results can lay a theoretical foundation for real-time monitoring of the structural response of an FB under the action of mooring forces and promote the development of intelligent methods for the operation and maintenance of a sea lock, which have important scientific significance and engineering value.

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Validation of JSC “Troitsa” berths bollards in the “Chayka” port of Severodvinsk

Garibin,

Butsanets,

Egorov

2024

jour

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Berthing equipment of two berths of JSC “Troitsa” is considered. They are “Berth for petroleum products transshipment” and “Reinforced concrete berth with crane tracks” of “Chayka” port (Severodvinsk). The berths were put into operation half a century ago. Due to the regulatory service life expiration, the Scientific Research Association “Pleiada” LLC (Novorossiysk) carried out in 2021 a theoretical calculation to determine the bearing capacity of bollards. The purpose of the planned research is to check the safe functioning of the available mooring devices in the existing conditions of berthing facilities operation. The object of research is non-standard mooring bollards, for which there was no documentation on operational control during construction and commissioning certificates. The process of changing the technical condition and determining the bearing capacity of the bollards is considered as the subject of the research. It has been established that the mooring bollards of the studied berths are suitable for operation to ensure the mooring of vessels that do not exceed the design parameters and comply with the requirements of subparagraph (a) of paragraph 191 of the technical regulations on the safety of maritime transport facilities dated August 12, 2010 No. 620 (as amended on October 7, 2019). The results of organoleptic and instrumental examinations using a high-precision electronic dynamometer ACD/1R-250/7I-2 are presented. It is concluded that a correct assessment of the berthing equipment technical condition is achieved with proper organization of the expert service in combination with continuous deformation monitoring.

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Ultimate load capacities of mooring bollards and hull foundation structures

Cited by 4 publications

References 1 publication

Failure analysis and Mechanical Behaviour of A60 steel Bollards Used In Port Infrastructure

Failure analysis and Mechanical Behaviour of A60 steel Bollards Used In Port Infrastructure

Dynamic Inversion Model of the Mooring Force on a Floating Bollard of a Sea Lock

Validation of JSC “Troitsa” berths bollards in the “Chayka” port of Severodvinsk

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