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See detailInfluence of cracks on the stiffness of timber structural elements
Mergny, Elke ULg; Mateo, Raquel; Esteban, Miguel et al

Scientific conference (2016, August)

Cracks in timber structural elements lead users to downgrade them, while their influence on the mechanical properties is globally unknown. They are thus disadvantageous and responsible for an ... [more ▼]

Cracks in timber structural elements lead users to downgrade them, while their influence on the mechanical properties is globally unknown. They are thus disadvantageous and responsible for an underutilization of timber in new constructions. The phenomenon also impacts constructions subjected to transformation or renovation that are most of the time fully replaced, simply because of the ignorance of their bearing capacity. The present paper investigates the influence of cracks on stiffness, by analytical and numerical developments. It proposes a classification of cracks in six types (+ composite types) and models real beams, randomly cracked. It shows that the presence of cracks seems to decrease the stiffness of the beam. However, it is not so obvious to give the most damaging type of crack, among the six proposed. Further investigations will be necessary. [less ▲]

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See detailDescription of a design method for cryogenic concrete tanks based on a comparison between 2D and 3D numerical models
Mergny, Elke ULg; Poncin, Pierre; Latteur, Pierre ULg

Conference (2015, September)

Ammonia is used in the industry for the manufacture of fertilizers, explosives and polymers and is stored at -33°C in refrigerated tanks. In most cases, tanks are cylindrical and are composed of a steel ... [more ▼]

Ammonia is used in the industry for the manufacture of fertilizers, explosives and polymers and is stored at -33°C in refrigerated tanks. In most cases, tanks are cylindrical and are composed of a steel liner that contains the ammonia, with the liner itself being protected by an outer reinforced concrete tank. The function of the concrete tank is to keep the ammonia safe in case of a leak in the liner. If a leak happens, the concrete wall will be suddenly subjected to a thermal shock, with a large temperature gradient between its internal and external faces (20°C to -33°C). These thermal effects lead to cracks in concrete that allow the ammonia to escape. The junctions between walls and the base slab and, walls and the roof are particularly sensitive to this cracking phenomenon. The aim of this paper is to present a method for the design of concrete ammonia tanks, especially taking into account thermal effects. Firstly, a 2D finite element model based on a plane frame is developed. The advantage of this approach, compared to 3D modelling, is that it requires little computing power and engineering time. Then, a 3D model is used to validate the 2D approach, and to identify its limitations. Particular attention is paid to the modeling of the weakest parts of the structure. Lastly, the paper will give the results of a parametric study based on the above 2D and 3D finite element modelling, in order to establish general guidelines for the design of ammonia tanks. [less ▲]

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See detailStress Analysis for the Reinforcement of Concrete Massive Structures, Compatible with Building Methods
Mergny, Elke ULg; Ansriou, Mohamed; Ouaar, Amine et al

Scientific conference (2015, August)

The wide majority of reinforced concrete structures are made of structural 1D or 2D elements such as beams, columns, slabs or walls, for which design methods are well known since decades, largely detailed ... [more ▼]

The wide majority of reinforced concrete structures are made of structural 1D or 2D elements such as beams, columns, slabs or walls, for which design methods are well known since decades, largely detailed in the literature such as EC2 or FIB Model Code [1, 2], and based on the fact that the knowledge of internal forces (moments, axial and shear forces) naturally lead to the values of the reinforcement. However, a minority of structures is characterized by a more or less complex three-dimensional geometry, for which a FEM analysis with 3D finite elements must be done, giving, as a result of the computation, the values of stresses inside de volume and not any more the values of internal forces. Those structures can be dams, underground foundations stabilizing structures highly subjected to wind, but also others, such as support structures for windturbine towers. This approach does not allow the application of usual rules of the organic calculation based on the knowledge of the internal forces. Some models are available in the literature, but they require some attention concerning the compatibility of the numerical solutions with the way reinforcement is practically placed. For instance, existing models assume that one can place variable percentage of reinforcements everywhere inside the volume, which is practically hard to perform, as reinforcement is generally placed along the faces of the volumes and transversely. The paper enumerates and summarizes the existing methods allowing calculating the reinforcement inside 3D massive structures using stress analysis, and then investigates how restrictions linked to the practically compatible position of the reinforcement inside the volumes can be taken into account. [less ▲]

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See detailISSD : Interactive Software for Structural Design
Latteur, Pierre ULg; Houdart, Sebastien; Rebora

Software (2009)

Detailed reference viewed: 124 (4 ULg)
Peer Reviewed
See detailInfluence of stiffness constraints on optimal design of trusses using morphological indicators
Vandenbergh, Thomas; Ponsaert, Wim; Van Steirteghem, Jan et al

(2006)

Detailed reference viewed: 38 (0 ULg)
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See detailThe use of morphological indicators and genetic algorithms in structural optimization considering stiffness constraints
Van Den Bergh, Thomas; Verbeeck, Ben; De Wilde, Patrick et al

(2006)

Detailed reference viewed: 29 (0 ULg)
See detailCalculer une structure, de la théorie à l'exemple
Latteur, Pierre ULg

Book published by Academia Bruylant - fully revised and corrected edition (2006)

Cet ouvrage trouve sa place à mi-parcours entre la théorie de base de la résistance des matériaux et les méthodes de dimensionnement particulières propres aux différents matériaux. Il est écrit de manière ... [more ▼]

Cet ouvrage trouve sa place à mi-parcours entre la théorie de base de la résistance des matériaux et les méthodes de dimensionnement particulières propres aux différents matériaux. Il est écrit de manière à marquer une transition entre des décennies de calcul manuel et une ère nouvelle dans laquelle le calculateur doit pouvoir utiliser la puissance des logiciels de calcul en connaissance de cause tout en conservant un oeil critique sur les résultats qu'ils procurent. Particulièrement pragmatique et pédagogique, ce livre passe en revue les bases théoriques en les illustrant d'exercices entièrement résolus et commentés. Dans ce contexte il s'adresse à un large public allant de l'étudiant ingénieur ou architecte à l'ingénieur praticien et à l'architecte en passant par l'entrepreneur ou le concepteur de logiciels. [less ▲]

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See detailOptimisation des treillis à membrure supérieure variable sur base de la théorie des indicateurs morphologiques
Moureaux, Christine ULg; Latteur, Pierre ULg

in Revue scientifique des instituts supérieurs industriels francophones de Belgique (2004), 18

Detailed reference viewed: 27 (4 ULg)
Peer Reviewed
See detailCharge critique et longueur de flambement des éléments à inertie variable et aux conditions d'extrémité élastiques
Latteur, Pierre ULg

in revue scientifique des Instituts supérieurs industriels francophones de Belgique (2001), 15

Detailed reference viewed: 150 (2 ULg)
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See detailOptimisation des arcs paraboliques et en chaînette – aide à la conception sur base d'indicateurs morphologiques
Latteur, Pierre ULg; Samyn, Philippe; De Wilde, Patrick

in Revue Française de Génie Civil (2001), 5

Detailed reference viewed: 33 (0 ULg)
See detailLe béton armé dans tous ses états
Latteur, Pierre ULg

Book published by Academia Bruylant - 2nd (2001)

Cet ouvrage décrit les méthodes de calculs des sesctions en béton armé selon la méthodes aux états limites ultimes, sur fond d'exercices résolus.

Detailed reference viewed: 244 (6 ULg)
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See detailComparaison des treillis classiques de type Warren, Pratt et Howe : optimisation et prédimensionnement sur base d'indicateurs morphologiques
Latteur, Pierre ULg; Samyn, Philippe; De Wilde, Patrick

in Revue Française de Génie Civil (2000), 4

Detailed reference viewed: 316 (3 ULg)
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See detailIndicateurs de volume et de déplacement d'une structure isostatique : cas de la travée horizontale chargée verticalement
Samyn, Philippe; Latteur, Pierre ULg

in Bulletin n°7/12/2000 de la Classe des sciences de l'Académie royale de Belgique (2000)

Detailed reference viewed: 43 (2 ULg)
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See detailA Search For Efficient Trusses
Latteur, Pierre ULg; Samyn, Philippe

(2000)

Detailed reference viewed: 24 (0 ULg)
Peer Reviewed
See detailVolume and Displacement Indicators For Tubes And Profiles
Samyn, Philippe; Latteur, Pierre ULg

(2000)

Detailed reference viewed: 25 (0 ULg)
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See detailOptimization of Parabolic Arches Subjected to Distributed Loads
Latteur, Pierre ULg; Samyn, Philippe

(1999, September)

Detailed reference viewed: 21 (1 ULg)
Peer Reviewed
See detailInternally Stayed Trusses : The Search for Minimum Weight
Samyn, Philippe; Latteur, Pierre ULg

(1999, September)

Detailed reference viewed: 24 (0 ULg)