References of "Denoël, Vincent"
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See detailMultiple scales solution for a beam with a small bending stiffness
Denoël, Vincent ULg; Detournay, Emmanuel

in Journal of Engineering Mechanics (2010), 136(1), 69-77

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See detailThe problem of a drillstring inside a curved borehole: a perturbed Eulerian approach
Denoël, Vincent ULg; Detournay, Emmanuel

(2009, February)

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See detailPolynomial approximation of aerodynamic coefficients based on the statistical description of the wind incidence
Denoël, Vincent ULg

in Probabilistic Engineering Mechanics (2009), 24(2), 179-189

In civil engineering applications, the aerodynamic coefficients are usually measured in wind tunnels for several wind incidences. The measurement results need to be linearized in order to perform the ... [more ▼]

In civil engineering applications, the aerodynamic coefficients are usually measured in wind tunnels for several wind incidences. The measurement results need to be linearized in order to perform the design of the structure. This paper justifies the use of different linearization techniques for different assessments as divergence or buffeting analysis. In this latter context, it is proposed to linearize the aerodynamic coefficient by the least-square method, using the probability density function of the wind incidence as a weighting function. First this probability density function is computed for a 2-D wind flow, as a function of the wind intensities and their correlation. Then, the comparison of results from different linearization techniques provides surprising results indicating that what is usually performed should be considered with care. [less ▲]

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See detailMultiple mode analysis of the self-excited vibrations of rotary drilling systems
Germay, Christophe; Denoël, Vincent ULg; Detournay, Emmanuel

in Journal of Sound & Vibration (2009), 325(1-2), 362-381

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See detailLimit analysis of the statistics of quasi-steady non-linear aerodynamic forces for small turbulence intensities
Denoël, Vincent ULg

in Probabilistic Engineering Mechanics (2009), 24(4), 552-564

This paper focuses on the estimation of statistical characteristics of a specific quasi-steady wind loading used in buffeting analyses. In this loading, the intrinsic non-linearity of aerodynamic ... [more ▼]

This paper focuses on the estimation of statistical characteristics of a specific quasi-steady wind loading used in buffeting analyses. In this loading, the intrinsic non-linearity of aerodynamic coefficients is considered and approached by a polynomial expression of any a priori chosen degree. As rigorous developments of the statistical moments would result in impractical formulations, we suggest to consider the smallness of the turbulence intensities to construct, by means of a limit analysis, approximate expressions of the raw moments of aerodynamic forces. From these expressions, approximate cumulants and associated dimensionless characteristics, such as skewness and excess coefficients, are derived. The accuracy of the proposed analytical relations is assessed by comparison with Monte Carlo simulations, and the relevance of the sophisticated non-linear loading under consideration is compared to more traditional models. [less ▲]

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See detailEstimation of modal correlation coefficients from background and resonant responses
Denoël, Vincent ULg

in Structural Engineering and Mechanics: an International Journal (2009), 32(6), 725-740

A new simple relation for the estimation of modal correlation coefficients is presented. It is obtained from the decomposition of covariances of modal responses into background and resonant contributions ... [more ▼]

A new simple relation for the estimation of modal correlation coefficients is presented. It is obtained from the decomposition of covariances of modal responses into background and resonant contributions, as it is commonly done for the variances. Thanks to appropriate assumptions, the modal correlation coefficients are estimated as weighted sums of two limit values, corresponding to the background and resonant responses respectively. The weighting coefficients are expressed as functions of the background-to-resonant ratios, which makes the proposed formulation convenient and easily accessible. The simplicity of the mathematical formulation facilitates the physical interpretation. It is for example proved that modal correlation coefficients can be non negligable even in case of well separated natural frequencies, which is sometimes unclear in the litterature. The new relation is mainly efficient in case of large finite element models. It is applied and validated on a finite element buffeting analysis of the Viaduct of Millau, the highest bridge deck ever built so far. [less ▲]

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See detailAsymptotic expansion of slightly coupled modal dynamic transfer functions
Denoël, Vincent ULg; Degée, Hervé ULg

in Journal of Sound & Vibration (2009), 328

In case of non-diagonal modal damping, normal modes of vibration do not decouple modal equations. The usual way to handle such a non-diagonal modal damping matrix is to neglect its off-diagonal elements ... [more ▼]

In case of non-diagonal modal damping, normal modes of vibration do not decouple modal equations. The usual way to handle such a non-diagonal modal damping matrix is to neglect its off-diagonal elements. In this paper, we propose an approximatemethod based on an asymptotic expansion of the transfer function. It is intermediate between the classical decoupling approximation and the formal solution requiring a full matrix inversion. Indeed, on the one hand, it allows to partially account for modal coupling and, on the other hand, still allows the modal equations to be solved independently from each other. We first provide the mathematical background necessary to canvass the proposed method, then consider a benchmark against which the benefits of the method are measured. [less ▲]

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See detailDynamic interaction between merchandizes and supporting structure in steel storage racking systems
Degée, Hervé ULg; Denoël, Vincent ULg

in Proceedings of the COMPDYN 2009 Conference (2009)

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See detailTornades, vents exceptionnels et constructions
Denoël, Vincent ULg

Learning material (2008)

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See detailAdvantages of a semi-analytical approach for the analysis of an evolving structure with contacts
Denoël, Vincent ULg

in Communications in Numerical Methods in Engineering (2008), 24(12), 1667-1683

This paper presents a semi-analytical approach for the evolution analysis of a beam into given boundaries. The analytical description of contact locations, contact forces and beam deflections results in ... [more ▼]

This paper presents a semi-analytical approach for the evolution analysis of a beam into given boundaries. The analytical description of contact locations, contact forces and beam deflections results in an exact modelling of the phenomenon (no penetration allowed). Despite the apparent complexity of the problem, the analytical relations leading to two-point boundary and integro-restrained differential equations are formally written. An iterative resolution of these equations is adopted by converting the problem into a single-point boundary value one. Due to a proper selection of the global unknowns, namely the contact forces and their locations, the proposed method is particularly efficient in the context of evolving structures. The resolution is illustrated on a simple example, and comparisons with the finite element method are given as persuasive arguments. Copyright © 2007 John Wiley & Sons, Ltd. [less ▲]

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See detailSeismic behaviour of storage racks made of thin-walled steel members
Degée, Hervé ULg; Denoël, Vincent ULg

in Proceedings of the 7th European Conference on Structural Dynamics (2008)

This paper presents an example of rack structure modelling accounting for structural non-linearities and for the possible relative motion between the rack and the stored goods that occurs as soon as the ... [more ▼]

This paper presents an example of rack structure modelling accounting for structural non-linearities and for the possible relative motion between the rack and the stored goods that occurs as soon as the inertial force exceeds the friction resistance. It evidences that the constant reduction factor proposed by the RMI should actually be modulated according to the structural typology (and in particular the first natural frequency of the system) and to the ratio ag/μ between the design acceleration and the friction coefficient of the pallets. [less ▲]

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See detailComparison of parametric excitation and excitation of an elastic stay cable
Denoël, Vincent ULg; Degée, Hervé ULg

in Proceedings of the 7th European Conference on Structural Dynamics (2008)

In cable-stayed bridge applications, the vertical vibrations of a bridge deck induce vertical motions of the cable anchors that may cause large amplitudes oscillations of the cables. This vertical motion ... [more ▼]

In cable-stayed bridge applications, the vertical vibrations of a bridge deck induce vertical motions of the cable anchors that may cause large amplitudes oscillations of the cables. This vertical motion is not collinear with the cable chord and can be split into a transverse and an axial component. The latter one is responsible for a parametric excitation. Since this phenomenon leads to serious dynamic instability, whereas the transverse component provides simple resonances only, the transverse anchor motion is often disregarded or considered in a separate analysis. However, because of the cable’s non linear behaviour, the response of the cable under both components cannot simply be added. It is thus important to consider at once this actual “cable excitation”, rather than approaching it by an axial excitation, as often reported in the study of parametric excitations. In this paper, the difference between the two modes of excitation is illustrated with a finite element model. The simplicity of the model allows an efficient parametric study of the vibrations of a cable under both excitations, for various cable inclinations and anchor frequencies. [less ▲]

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See detailExperimental investigations on non-engineered masonry houses in low to moderate seismicity areas
Degée, Hervé ULg; Denoël, Vincent ULg; Candeias, P. et al

in Proceedings of the 14WCEE, 14th World Conference on Earthquake Engineering (2008)

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See detailRocking behaviour of prefabricated concrete frames subjected to earthquake action
Degée, Hervé ULg; Denoël, Vincent ULg

in Proceedings of ACOMEN 2008, Advanced Computational Methods in Engineering (2008)

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See detailAn introduction to reliability analysis
Denoël, Vincent ULg

Learning material (2007)

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See detailExperimental determination of dynamic properties of the concrete foundation of a cement roller mill
Denoël, Vincent ULg; Butz, Christiane; Jakobi, Hubertus et al

in Proceedings of the Conference on EVACES 07, Experimental Vibration Analysis of Civil Engineering Structures (2007)

Extensive dynamic measurements are performed on the massy and stiff concrete foundation of a cement roller mill. Dynamic properties like mode shapes, natural frequencies and damping ratios are determined ... [more ▼]

Extensive dynamic measurements are performed on the massy and stiff concrete foundation of a cement roller mill. Dynamic properties like mode shapes, natural frequencies and damping ratios are determined using the SSI-COV method. A methodology for the statistical estimation of these modal properties by evaluating a sufficient amount of time windows is derived and discussed. [less ▲]

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See detailNumerical modelling of storage racks subjected to earthquake
Degée, Hervé ULg; Denoël, Vincent ULg

in Proceedings of COMPDYN 07, Conference on Computational Dynamics (2007)

This paper presents some aspects of the non linear dynamic time-history analysis of storage racks made of thin-walled steel products commonly used in warehouses when they are subjected to an earthquake ... [more ▼]

This paper presents some aspects of the non linear dynamic time-history analysis of storage racks made of thin-walled steel products commonly used in warehouses when they are subjected to an earthquake action. It focuses essentially on the accounting for structural non-linearities (geometric second order behavior of the structure and non-linear material be-havior of the joints) and for the possible relative motion between the rack and the stored goods that occurs as soon as the inertial force exceeds the friction resistance. In particular, it presents the algorithm used of to couple these two problems, followed by some simple appli-cations and comparisons with test results. [less ▲]

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See detailExperimental investigation on the seismic behaviour of north European masonry houses
Degée, Hervé ULg; Denoël, Vincent ULg; Candeias, P. et al

in Proceedings of SISMICA 07, Sismic Congress (2007)

This paper presents the results of shaking table tests performed on two full-scale masonry houses typical from North-European countries. The main objective of the experimental study is to assess the ... [more ▼]

This paper presents the results of shaking table tests performed on two full-scale masonry houses typical from North-European countries. The main objective of the experimental study is to assess the seismic behaviour of such houses for situations of low to moderate seismicity and to investigate the actual effect of some reinforcing details. [less ▲]

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See detailPraktisches Verfahren zur Bemessung von Brückenseilen und -hängern zur Vermeidung Regen-Wind-induzierter Schwingungen
Denoël, Vincent ULg; Hortmanns, Michael; Sedlacek, Gerhard

in Stahlbau (2007), 76(2), 126-130

Rain-wind induced vibrations have been widely studied during the last decades. Today it is desirable to use the experience gathered in this field in order to develop a practical design procedure offering ... [more ▼]

Rain-wind induced vibrations have been widely studied during the last decades. Today it is desirable to use the experience gathered in this field in order to develop a practical design procedure offering both security and economy. After a restricted review of some analytical models, this paper points out the need for a semi-empirical method if the complexity of this design procedure has to be kept at its minimum. Based on measured data collected during field tests and wind tunnel experiments, a new proposal is suggested. [less ▲]

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