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

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

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

in Marine Structures (2015), 43

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See detailULTIMATE STRENGTH - Discussion on Committee III.1- ISSC 2012's report
Rigo, Philippe ULg

in Fricke, Wolfgang; Bronsart, Robert (Eds.) PROCEEDINGS OF THE 18TH INTERNATIONAL SHIP AND OFFSHORE STRUCTURES CONGRESS - VOLUME 3 (2015)

Concern for the ductile behavior of ships and o shore structures and their structural components under ultimate conditions. Attention shall be given to the influence of fabrication imperfections and in ... [more ▼]

Concern for the ductile behavior of ships and o shore structures and their structural components under ultimate conditions. Attention shall be given to the influence of fabrication imperfections and in-service damage and degradation on reserve strength. Uncertainties in strength models for design shall be highlighted. [less ▲]

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See detailNumerical crashworthiness analysis of an offshore wind turbine monopile impacted by a ship
Bela, Andreea ULg; Le Sourne, Hervé; Buldgen, Loïc ULg 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 detailPIANC Report 140 - Semi-probabilistic design concept for inland hydraulic structures
PIANC WG 140; Rigo, Philippe ULg; Buldgen, Loïc ULg

Book published by PIANC (2015)

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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 ULg 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 detailResidual Ultimate Strength of Cracked Steel Unstiffened and Stiffened Plates under Longitudinal Compression
Bayatfar, Abbas ULg; Rigo, Philippe ULg

in Thin-Walled Structures (2014), 84

This paper numerically deals with the influence of cracks (in terms of length and location) on the ultimate compressive strength characteristics of unstiffened and stiffened plate elements used in thin ... [more ▼]

This paper numerically deals with the influence of cracks (in terms of length and location) on the ultimate compressive strength characteristics of unstiffened and stiffened plate elements used in thin-walled structures. The cracks were presumed to be through-thickness, having no contact between their faces and no propagation was allowed. A series of nonlinear finite element analyses was conducted using ANSYS commercial finite element code in which the Newton-Raphson method has been employed to solve the nonlinear governing equations. This study indicates that the length of cracks and especially its location can significantly affect the ultimate strength characteristics of unstiffened and stiffened plate elements subjected to axial compressive action. [less ▲]

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See detailSHIP COLLISION ON LOCK GATES – TECHNICAL SOLUTIONS AND SIMULATION APPROACHES
Ehlers, Sören; Le Sourne, Hervé; Buldgen, Loïc ULg 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 ULg; Gazerzadeh, Afshin; Bela, Andreea ULg 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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See detailSIMPLIFIED SEISMIC ANALYSIS OF LOCK GATES
Buldgen, Loïc ULg; Degée, Hervé ULg; Lesourne, Hervé et al

in PIANC 2014 Conference (2014, June 02)

The paper deals with the seismic design of lock gates. When such structures are submitted to an earthquake, the water contained in the chamber is responsible for an additional hydrodynamic pressure acting ... [more ▼]

The paper deals with the seismic design of lock gates. When such structures are submitted to an earthquake, the water contained in the chamber is responsible for an additional hydrodynamic pressure acting on the gate. This one is the sum of three different parts, respectively called the convective, rigid and flexible contributions. The two first ones have already been extensively studied in the literature, but the flexible part is more difficult to assess as it is largely influenced by the coupling occurring between the fluid and the gate. To overcome this difficulty, it is of course possible to use finite elements software, but doing so is not always convenient. This is why some research have been undertaken to provide a rapid way for approximating the flexible pressure on lock gates. This is achieved by applying the analytical approach that is shortly presented in this paper. As a matter of validation, the results obtained through this simplified procedure are compared to numerical solutions. The agreement between both of them is found to be satisfactory. [less ▲]

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See detailOn the ultimate compressive strength of transversely cracked plates
Bayatfar, Abbas ULg; Pire, Timothée ULg; Rigo, Philippe ULg

in Proceedings of the ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering (2014, June)

This paper aims to numerically analyse the ultimate strength of transversely cracked steel plates under longitudinal compressive loading, considering the effect of initial distortion as well. The main ... [more ▼]

This paper aims to numerically analyse the ultimate strength of transversely cracked steel plates under longitudinal compressive loading, considering the effect of initial distortion as well. The main objective of this study is to investigate the ultimate compressive strength characteristics of an unstiffened steel plate due to transverse cracking damages located in the middle (i.e. centre cracks and edge cracks). To achieve that, a series of non-linear finite element (FE) analyses are carried out using ANSYS commercial finite element code. The obtained FE results are discussed to indicate the amount of crack influence, in terms of its length and location, on the ultimate compressive strength of a steel plate element with different thicknesses. [less ▲]

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See detailResilience to Flooding - Draft Building Code
Clarkson, John; Sullican, David; Braun, Kenton et al

in PIANC Yearbook 2013 (2014)

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See detailA review on simulation-based optimization methods applied to building performance analysis
Nguyen, Anh Tuan ULg; Reiter, Sigrid ULg; Rigo, Philippe ULg

in Applied Energy (2014), 113

Recent progress in computer science and stringent requirements of the design of “greener” buildings put forwards the research and applications of simulation-based optimization methods in the building ... [more ▼]

Recent progress in computer science and stringent requirements of the design of “greener” buildings put forwards the research and applications of simulation-based optimization methods in the building sector. This paper provides an overview on this subject, aiming at clarifying recent advances and outlining potential challenges and obstacles in building design optimization. Key discussions are focused on handling discontinuous multi-modal building optimization problems, the performance and selection of optimization algorithms, multi-objective optimization, the application of surrogate models, optimization under uncertainty and the propagation of optimization techniques into real-world design challenges. This paper also gives bibliographic information on the issues of simulation programs, optimization tools, efficiency of optimization methods, and trends in optimization studies. The review indicates that future researches should be oriented towards improving the efficiency of search techniques and approximation methods (surrogate models) for large-scale building optimization problems; and reducing time and effort for such activities. Further effort is also required to quantify the robustness in optimal solutions so as to improve building performance stability. [less ▲]

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See detailThe effects of geometrical imperfections on the ultimate strength of aluminium stiffened plates subject to combined uniaxial compression and lateral pressure
Khedmati, Mohammad Reza; Pedram, Masoud; Rigo, Philippe ULg

in Ships and Offshore Structures (2014)

The present study aims at determining the effects of the geometrical imperfections on the ultimate strength and load-carrying capacity of aluminium stiffened plates under combined axial compression and ... [more ▼]

The present study aims at determining the effects of the geometrical imperfections on the ultimate strength and load-carrying capacity of aluminium stiffened plates under combined axial compression and lateral pressure. The finite element models proposed by the Committee III.1 ‘Ultimate Strength’ of ISSC’2003 are used in the present investigation. Initial imperfections as proposed by ISSC committee as well as those recommended by Ship Structure Committee are considered in the analyses. Models are tested using non-linear finite element elastic–plastic analyses. Aluminium alloy AA6082-T6 is selected as the material for the models. The studied models are triple-span panels stiffened by either extruded or non-extruded angle-bar profiles. Different arrangements of heat-affected zone (HAZ) are considered. The main outcomes of this study show the need for a subtle assessment of the real shapes of the initial deformations. The way they affect the ultimate strength of models is clarified through finite element analyses. [less ▲]

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See detailA Simplified procedure to assess the dynamic pressures on large reservoirs
Buldgen, Loïc ULg; Degée, Hervé ULg; Le Sourne, Hervé et al

in Proceedings of the 9th International Conference on Structural Dynamics - EURODYN 2014 (2014)

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See detailPIANC Report n° 137 - 2014 NAVIGATION STRUCTURES: THEIR ROLE WITHIN FLOOD DEFENCE SYSTEMS
Clarkson, John; Braun, Kenton; Forsyth, Graeme et al

Book published by PIANC (2014)

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See detailA bi-objective optimization model for a bimodal network of oil transportation
Belaid, Emna ULg; Saadi, Ismaïl ULg; Rigo, Philippe ULg et al

Conference (2014)

Transportation of oil requires attention for a variety of reasons, the most important being the external costs caused by adverse events. These adverse events affect not only the environment costs but also ... [more ▼]

Transportation of oil requires attention for a variety of reasons, the most important being the external costs caused by adverse events. These adverse events affect not only the environment costs but also the societal costs. In this paper, a bi-objective optimization model for a bimodal network of oil transportation is presented. The paper discusses a mathematical model that takes into account two main decision criteria, namely cost and safety. A linear programming model is presented, in which the focus is laid on the different elements that affect the performance of the bi-modal transportation chain of oil. The disturbing elements that are considered include technical failures, road conditions and vandalism acts. Thus, in this study, it is investigated how the bimodal network must be designed to avoid adverse effects caused by these disturbing elements. The goal of the approach is to maximize safety and minimize costs. Data from a real life example (i.e. the Tunisian national oil company) will be used to calibrate the model. [less ▲]

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See detailSmart Rivers Conference 2013 - Proceedings
Rigo, Philippe ULg; Wolters, Milou

Book published by PIANC - 25th Nov 2013 (2013)

Detailed reference viewed: 79 (4 ULg)