Numerical investigations of a prestressed pontoon wall subjected to ship collision loads

Sha, Yanyan; Amdahl, Jørgen

doi:10.1016/j.oceaneng.2018.11.054

Cited by 21 publications

(7 citation statements)

References 24 publications

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“…An innovative foam-filled lattice composite bumper system (Zhu et al, 2018) shows the properties of good energy absorbing and highly designable and performs an obvious advantage in the peak impact force and duration. Sha et al (2019a) present a numerical investigation of ship collision response for a floating pontoon. The bridge girder design against ship forecastle collision loads (Sha et al, 2019b) was also discussed and a simple but effective strengthening method was proposed to increase the collision resistance of steel bridge girders.…”

Section: Introductionmentioning

confidence: 99%

Initial response mechanism and local contact stiffness analysis of the floating two-stage buffer collision-prevention system under ship colliding

Lü

Chen

Gao

et al. 2021

Advances in Structural Engineering

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A floating two-stage buffer collision-prevention system (FTBCPS) has been proposed to reduce the impact loads on the bridge pier in this paper. The anti-collision process can be mainly divided into two stages. First, reduce the ship velocity and change the ship initial moving direction with the stretching and fracture of the polyester ropes. Second, consume the ship kinetic energy with the huge damage and deformation of the FTBCPS and the ship. The main feature of the FTBCPS lies in the first stage and most of the ship kinetic energy can be dissipated before the ship directly impacts on the bridge pier. The contact stiffness value between the ship and the FTBCPS can be a significant factor in the first stage and the calculation method of it is the focus of this paper. The contact force, the internal force and the general equation of motion have been given in the first part. The structure model of the ship and the FTBCPS are then established in the ANSYS Workbench. After that, 38 typical load cases of the ship impacting on the FTBCPS are conducted in LS-DYNA. The reduction processes of the ship kinetic energy and the ship velocity in different load cases have been investigated. It can be summarized that the impact angle and the ship initial velocity are the main factors in the energy and velocity dissipation process. Moreover, the local impact force-depth curves have also been studied and the impact angle is found to be the only significant factor on the ship impact process. Next, the impact force-depth curves with different impact angles are fitted and the contact stiffness values are accordingly calculated. Finally, the impact depth range, the validity of the local simulation results and the consistency of the fitted stiffness value are verified respectively, demonstrating that the fitted stiffness values are applicable in the global analysis.

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Section: Introductionmentioning

confidence: 99%

Initial response mechanism and local contact stiffness analysis of the floating two-stage buffer collision-prevention system under ship colliding

Lü

Chen

Gao

et al. 2021

Advances in Structural Engineering

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“…More recently, a numerical analysis of ship collisions against prestressed RC pontoon walls was carried out by Sha et al (2019), where a dynamic punching shear check method was proposed. Moreover, the concrete, reinforcement bars, and tendons of a 0.9 m RC wall were explicitly modeled and integrated into the collision analysis using NL-FE in which the effects of tendon prestress, wall thickness, and ship bulb geometries were studied.…”

Section: Introductionmentioning

confidence: 99%

Ship collision events against reinforced concrete offshore structures

Marquez

Sourne

Rigo

2021

Developments in the Analysis and Design of Marine Structures

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The number of Floating Offshore Wind Turbines (FOWT) is expected to increase significantly in the coming years to face the challenges of the current global decarbonization policies. The use of materials such as Reinforced Concrete in the floating substructures becomes then attractive for reducing both maintenance and chain manufacturing costs, as seen in different industrial scale prototypes such as Floatgen from BW-IDEOL. The non-linear behavior of plain concrete, in addition to numerical complications related to explicit reinforcement modeling, makes the elastic-plastic calculations of these structural elements particularly challenging. In this work, a numerical study of different constitutive concrete models available in the commercial software LS-DYNA is presented, whose capabilities in modeling flexural and shear failure arising from ship collisions events are tested using structural elements with geometrical and mechanical properties similar to those found in current FOWT prototypes.

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“…Ship collision is also one important issue of consideration of the design. Ship collision on the pontoon wall and bridge deck girder have been investigated [23,24]. Various limit states, i.e., the fatigue limit state (FLS), ultimate limit state (ULS), serviceability limit state (SLS), and accidental limit state (ALS), should be investigated for the floating bridge design.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modelling and Dynamic Response Analysis of Curved Floating Bridges with a Small Rise-Span Ratio

Wan

Jiang

Dai

2020

JMSE

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As a potential option for transportation applications in coastal areas, curved floating bridges with a same small specified rise to span ratio of 0.134, supported by multiple pontoons, are investigated in this paper. Two conceptual curved bridges are proposed following a circular arc shape with different span lengths (500 and 1000 m). Both bridges are end-connected to the shoreline without any underwater mooring system, while the end-connections can be either all six degrees of freedom (D.O.F) fixed or two rotational D.O.F released. Eigen value analysis is carried out to identify the modal parameters of the floating bridge system. Static and dynamic analysis under extreme environmental conditions are performed to study the pontoon motions as well as structural responses of the bridge deck. Deflections and internal forces (axial forces, shear forces, and bending moment) are thoroughly studied with the variation of the span length and end support conditions in terms of the same specified small rise-span ratio. The ratio of axial force to horizontal bending moment are presented. From the study, it is found that the current parameters for the bridge are relatively reasonable regarding responses. However, the small rise-span does not provide enough arch effects. A higher rise-span ratio or stiffer bridge cross-sectional property is preferred, especially for the long bridge. In addition, the flexible end connections are preferred considering the structural responses at the end regions.

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Numerical investigations of a prestressed pontoon wall subjected to ship collision loads

Cited by 21 publications

References 24 publications

Initial response mechanism and local contact stiffness analysis of the floating two-stage buffer collision-prevention system under ship colliding

Initial response mechanism and local contact stiffness analysis of the floating two-stage buffer collision-prevention system under ship colliding

Ship collision events against reinforced concrete offshore structures

Numerical Modelling and Dynamic Response Analysis of Curved Floating Bridges with a Small Rise-Span Ratio

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