References of "Buldgen, Loïc"
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See detailValidation of a simplfied method for the crashworthiness of offshore wind turbine jackets using finite elements simulations
Pire, Timothée ULiege; Echeverry Jaramillo, Sara ULiege; Rigo, Philippe ULiege et al

in Guedes Soares, Carlos; Garbatov, Yordan (Eds.) Progress in the Analysis and Design of Marine Structures (2017, May 08)

The work presented in this paper focuses on crashworthiness of jacket foundations used to support offshore wind turbines in moderately deep waters. In a previous research work, the authors have developed ... [more ▼]

The work presented in this paper focuses on crashworthiness of jacket foundations used to support offshore wind turbines in moderately deep waters. In a previous research work, the authors have developed a solver based on analytical formulations, derived from limit plastic analysis, to assess the damage of such foundations when impacted by a ship. The present paper describes the methodology followed to perform numerical validations of the theoretical developments, including a description of the finite element models, the computation hypotheses and the simulations performed using LS-DYNA code. Many parameters describing the collision scenario are investigated, namely the type, the mass, the initial velocity and the trajectory of the striking ship. Some comparisons between analytical and numerical results are finally shown. [less ▲]

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See detailOptimisation of Ship and Offshore Structures and Effective Waterway Infrastructures to Support the Global Economic Growth of a Country/Region
Rigo, Philippe ULiege; Bayatfar, Abbas ULiege; Buldgen, Loïc ULiege et al

Scientific conference (2017, March 15)

This paper is the written support of Prof. Ph. Rigo for his keynote lecture at the 5th International Congress for Ship Design and Naval Engineering (March 2017, Columbia). After presenting of the main ... [more ▼]

This paper is the written support of Prof. Ph. Rigo for his keynote lecture at the 5th International Congress for Ship Design and Naval Engineering (March 2017, Columbia). After presenting of the main research activities at ANAST, ULG, he discussed the way to improve the effectiveness of waterway infrastructures to support the global economic growth of a country/region. This paper includes the following parts:  Ship Structure Optimization: methodology to perform ship scantling optimization, decreasing steel weight and keeping the production cost at an acceptable level. We first review the links between “Design” and “Optimization” and secondly define the place of “Ship Structure Optimization” within the general framework of a “Ship Optimization”.  Ship impacts (Collision), with applications to navigation lock and dry dock gates: these gates have to be designed taking into account accidental loads, such as ship collisions. A new simplified analytical method is proposed, based on the so-called super-element method. This method was developed to rapidly assess the crashworthiness of the collided structure and avoid high computational effort of numerical simulations.  Inland waterway Navigation and the development in South America of Inland Waterway Classifications.  EMSHIP, European ERASMUS MUNDUS education program (www.emship.eu): the unique master in Ship & Offshore Structures awarded by the prestigious European Erasmus Mundus Program. Indeed, EMSHIP shares the outstanding experiences of educators, trainers, industrial partners and students in the rapidly developing areas of marine and offshore engineering industry. [less ▲]

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See detailInvestigation of the added mass method for seismic design of lock gates
Buldgen, Loïc ULiege; Le Sourne, Hervé; Caprace, Jean-David ULiege et al

in Engineering Structures (2017)

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See detailShip collision analysis on Offshore Wind Turbine monopile foundations
Bela, Andreea ULiege; Le Sourne, Hervé; Buldgen, Loïc ULiege et al

in Marine Structures (2017), 51

An offshore wind farm covers a large maritime area and the site can be located close to traffic lanes of commercial and passenger ships, which may lead to possible collision events. The work presented in ... [more ▼]

An offshore wind farm covers a large maritime area and the site can be located close to traffic lanes of commercial and passenger ships, which may lead to possible collision events. The work presented in this paper aimed to understand both the crushing behavior and the nacelle dynamics of a predefined monopile offshore wind turbine when impacted by a ship. Another objective was to deeply investigate the influence of various parameters like ship impact velocity and location, wind direction, soil stiffness and deformability of the striking ship. First, nonlinear numerical simulations of ship - Offshore Wind Turbine (OWT) collisions have been carried out with a rigid striking ship for a better understanding of the OWT’s structural behaviour during collision. Different configurations for the wind turbine’s structure have been used in order to highlight the modifications in behaviour induced by changing the soil conditions or the loading scenario. The resulting resistant force and internal energies have been compared as well as the tower top (nacelle) displacements and accelerations. Then, another series of simulations have been performed with a deformable ship in order to investigate the influence of the deformability of the striking ship on the OWT’s behaviour. It is worth noting that all these numerical results will further serve to fix the hypotheses for the development of a simplified tool based on analytical formulations. [less ▲]

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See detailInvestigation of bulbous bow resistance during oblique collisions against tubes or plane walls
Buldgen, Loïc ULiege; Le Sourne, Hervé; Berthonneau, Pierre

in Proceedings of the International Conference on Ships and Offshore Structures (2016, September 02)

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See detailShip collision on offshore wind turbines
Bela, Andreea ULiege; Pire, Timothée ULiege; Buldgen, Loïc ULiege et al

in PIANC Yearbook 2015 (2016)

In a context of development of renewable energies, large offshore wind farms are being built close to traffic lanes and collision risk analysis on supporting structures is becoming a major concern. The ... [more ▼]

In a context of development of renewable energies, large offshore wind farms are being built close to traffic lanes and collision risk analysis on supporting structures is becoming a major concern. The aim of this paper is to present an overview on the ship – Offshore Wind Turbine (OWT) collision events. The behaviour of the OWTs structure with monopile and jacket foundations is investigated by means of numerical simulations. Furthermore, an analytical approach is presented for assessing the crashworthiness of the jacket foundation. [less ▲]

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See detailAnalytical developments to assess the crashworthiness of an offshore wind turbine jacket impacted by a ship
Pire, Timothée ULiege; Le Sourne, Hervé; Buldgen, Loïc ULiege et al

Poster (2015, December 10)

As the number of offshore wind farms is constantly increasing, impacts between ships and wind turbines is becoming a major concern. Nowadays, design offices use finite elements simulations to assess the ... [more ▼]

As the number of offshore wind farms is constantly increasing, impacts between ships and wind turbines is becoming a major concern. Nowadays, design offices use finite elements simulations to assess the crashworthiness of offshore supporting structures, which give accurate results but is time demanding. There is therefore a need for a faster method, especially during the pre-design stage. The purpose of this research is to develop analytical formulations, based on the so-called continuous elements method in order to compute the resistance of offshore wind turbine jackets when submitted to an impact. [less ▲]

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See detailPresentation of a simplified method for the crashworthiness of offshore wind turbine jackets
Pire, Timothée ULiege; Le Sourne, Hervé; Buldgen, Loïc ULiege et al

Conference (2015, October 13)

More and more offshore wind farms will be built in a near future and it is mandatory to perform for every new project a collision risk analysis. Actually, this is done by using finite elements software ... [more ▼]

More and more offshore wind farms will be built in a near future and it is mandatory to perform for every new project a collision risk analysis. Actually, this is done by using finite elements software, which is time consuming and not suitable for pre-design stage. The presentation show analytical developments performed in order to assess the crashworthiness of an offshore wind turbine jacket quickly. [less ▲]

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See detailSimplified analytical methods to analyze lock gates submitted to ship collisions and earthquakes
Buldgen, Loïc ULiege; Bela, Andreea ULiege; Rigo, Philippe ULiege

in Mathematical Modelling in Civil Engineering (2015), 11

This paper presents two simplified analytical methods to analyze lock gates submitted to two different accidental loads. The case of an impact involving a vessel is first investigated. In this situation ... [more ▼]

This paper presents two simplified analytical methods to analyze lock gates submitted to two different accidental loads. The case of an impact involving a vessel is first investigated. In this situation, the resistance of the struck gate is evaluated by assuming a local and a global deforming mode. The super-element method is used in the first case, while an equivalent beam model is simultaneously introduced to capture the overall bending motion of the structure. The second accidental load considered in this paper is the seismic action, for which an analytical method is presented to evaluate the total hydrodynamic pressure applied on a lock gate during earthquake, due due account being taken of the fluid-structure interaction. For each of these two actions, numerical validations are presented and the analytical results are compared to finite-element solutions. [less ▲]

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See detailReview of existing solutions and presentation of a simplified method for the crashworthiness of lock gates
Buldgen, Loïc ULiege; Ehlers, Sören; Le Sourne, Hervé et al

in Proceedings of the Smart Rivers 2015 Conference (2015, September)

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See detailDoctoral thesis abstract: Simplified analytical methods for the crashworthiness and the seismic design of lock gates
Buldgen, Loïc ULiege; Rigo, Philippe ULiege

in Ship Technology Research = Schiffstechnik (2015)

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See detailA simplified analytical method to evaluate the seismic pressure on plane lock gates
Buldgen, Loïc ULiege; Rigo, Philippe ULiege; Le Sourne, Hervé

in Engineering Structures (2015), 100

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See detailA simplified analytical method to estimate the resistance of plane lock gates impacted by river barges
Buldgen, Loïc ULiege; Le Sourne, Hervé; Rigo, Philippe ULiege

in Marine Structures (2015), 43

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See detailNumerical crashworthiness analysis of an offshore wind turbine monopile impacted by a ship
Bela, Andreea ULiege; Le Sourne, Hervé; Buldgen, Loïc ULiege et al

in Shenoi, R Ajit; Soares, Carlos Guedes (Eds.) Analysis and Design of Marine Structures (2015, March)

The consequences of collision events can range from minor structural damages of the supporting structure to complete collapse of the wind turbine, which may lead to disruptions of the electricity ... [more ▼]

The consequences of collision events can range from minor structural damages of the supporting structure to complete collapse of the wind turbine, which may lead to disruptions of the electricity production and, at worst, to sinking of the striking ship with probability of loss of human lives or/and pollution. For all these reasons, a collision risk analysis becomes mandatory at the pre-design stage in order to identify the collision scenarios having the greatest probabilities of occurrence, to estimate the consequences of collision events and to ensure safe operations through the wind farm service life. The goal of this paper is to outline the behavior of the monopile foundations during ship collision by performing non-linear finite element simulations. Many collision scenarios are analyzed in order to study the sensitivity of the monopile to various parameters like impact striking ship velocity, nacelle mass, wind direction, soil stiffness, vertical location of the impact point, wind orientation … The internal energy dissipated by deformation of the monopile, the crushing force and the indentation of the crushed area are compared for different situations, as well as the overall displacements of the supporting structure. [less ▲]

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See detailSimplified analytical methods for the crashworthiness and the seismic design of lock gates
Buldgen, Loïc ULiege

Doctoral thesis (2015)

The PhD dissertation aims to provide simplified tools based on analytical formulations in order to ease the pre-design of lock gates. The first part of the thesis is devoted to ship collisions. The ... [more ▼]

The PhD dissertation aims to provide simplified tools based on analytical formulations in order to ease the pre-design of lock gates. The first part of the thesis is devoted to ship collisions. The resistance of the impacted gate is evaluated by combining global and local deforming modes. In the second part of the dissertation, an analytical solution is proposed to estimate the total hydrodynamic pressure acting on a lock gate during a seism, with due consideration for the fluid-structure coupling. Numerical validations are proposed for both ship collisions and earthquakes. [less ▲]

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See detailShip collision on monopile offshore wind turbines
Bela, Andreea ULiege; Le Sourne, Hervé; Buldgen, Loïc ULiege et al

Poster (2015)

Every year, the offshore wind industry is expanding and the location of the future wind farms tends to move to deeper waters and closer to the traffic lanes. The consequence of this growth is that the ... [more ▼]

Every year, the offshore wind industry is expanding and the location of the future wind farms tends to move to deeper waters and closer to the traffic lanes. The consequence of this growth is that the probability of ship collisions will increase. For any new offshore wind farm projects, a collision risk analysis must be performed in order to identify the collision scenarios having the greatest probabilities of occurrence and to evaluate the consequences on the supporting structure and also on the mechanical parts of the wind turbines. The goal of this paper is to outline the behaviour of the monopile foundations during ship collision by performing non-linear finite elements simulations. Many collision scenarios are analysed in order to study the sensitivity of the monopile to a series of parameters like impact velocity of the striking ship, wind loads and soil stiffness. [less ▲]

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See detailPIANC Report 140 - Semi-probabilistic design concept for inland hydraulic structures
PIANC WG 140; Rigo, Philippe ULiege; Buldgen, Loïc ULiege

Book published by PIANC (2015)

Detailed reference viewed: 69 (2 ULiège)
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See detailA review of technical solutions and simulations approaches for ship collisions with lock gates
Ehlers, S; Le Sourne, H; Buldgen, Loïc ULiege et al

in Ship Technology Research = Schiffstechnik (2015), 62

Development of Analytical method sto assess the ship impact on lock gates

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See detailSHIP COLLISION ON LOCK GATES – TECHNICAL SOLUTIONS AND SIMULATION APPROACHES
Ehlers, Sören; Le Sourne, Hervé; Buldgen, Loïc ULiege et al

in Proceedings of the ICTWS 2014 7th International Conference on Thin-Walled Structures, Busan 28th September - 02 October 2014 (2014, September)

A ship colliding with a lock gate can result in severe structural damage and disrupt the lock operations. For heavily trafficked waterways containing locks such disruption of the lock operation can result ... [more ▼]

A ship colliding with a lock gate can result in severe structural damage and disrupt the lock operations. For heavily trafficked waterways containing locks such disruption of the lock operation can result in severe economic consequences if the gate has to be repaired, both for the lock operator and for the delayed ships. Consequently, the consequences of a ship colliding with a lock gate must be assessed. Therefore, this paper will present current regulatory requirements and recommendations including gate protection systems. Furthermore, simulation methods will be presented to allow for a direct assessment of the structural consequences. Thus, these methods will potentially lead to new structural design considerations as well as operational limitations in terms of specific ship approach velocities to remain below critical impact energies and thus allow for an undisrupted lock operation. [less ▲]

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See detailA SIMPLIFIED PROCEDURE TO ASSESS THE DYNAMIC PRESSURES ON LOCK GATES
Buldgen, Loïc ULiege; Gazerzadeh, Afshin; Bela, Andreea ULiege et al

in Proceedings of the ICTWS 2014 7th International Conference on Thin-Walled Structures, Busan 28th September - 02 October 2014 (2014, September)

The paper is concerned with the seismic design of lock gates. During an earthquake, it is evident that the liquid contained in the lock chamber is responsible for an additional hydrodynamic pressure ... [more ▼]

The paper is concerned with the seismic design of lock gates. During an earthquake, it is evident that the liquid contained in the lock chamber is responsible for an additional hydrodynamic pressure acting on the structure. This one is known to have three different contributions, which are respectively called the convective, rigid and flexible impulsive parts. The two first ones have already been extensively studied in the literature and are quite easy to evaluate. Nevertheless, characterizing the flexible contribution is more difficult, as it is largely influenced by the coupling occurring between the fluid and the gate. The only relevant way to overcome this difficulty seems to resort to finite elements software, which is not always convenient. Therefore, some research have been undertaken to provide a rapid meshless method leading to an approximation of the flexible pressure on lock gates. As detailed in the present paper, this is achieved by applying an analytical approach based on the virtual work principle. As a matter of validation, the results obtained analytically are compared to numerical solutions. The agreement between both of them is found to be satisfactory. [less ▲]

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