Dynamic interaction between merchandizes and supporting structure in steel storage racking systems

in Proceedings of the COMPDYN 2009 Conference (2009)

Seismic behaviour of storage racks made of thin-walled steel members

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 ▲]

Experimental investigations on non-engineered masonry houses in low to moderate seismicity areas

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

Experimental determination of dynamic properties of the concrete foundation of a cement roller mill

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 ▲]

Experimental investigation on the seismic behaviour of north European masonry houses

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 ▲]

Importance of modal cross-correlations on wind loaded structures

in Proceedings of the 3rd International Conference on Bridge Maintenance, Safety and Management (2006)

In civil engineering applications the dynamic analysis of large structure is often performed in a modal space. This method is known to offer an interesting decrease of the number of degrees of freedom as ... [more ▼]

In civil engineering applications the dynamic analysis of large structure is often performed in a modal space. This method is known to offer an interesting decrease of the number of degrees of freedom as well as a decomposition of the structure’s response in “uncoupled” components. Even if the response in each mode can be computed independently from the responses in the other ones, in the context of stochastic loading, the coherence of these modal responses must be accounted for in the determination of the structural response. These quantities are known as the modal cross-correlations. In this paper we will show that these crosscorrelations can be important (contrarily to what is sometimes thought) even in case of wellseparated natural frequencies. This will be illustrated on the analysis of the famous Viaduct of Millau during an erection stage. [less ▲]

An investigation on the sliding of pallets on storage racks subjected to earthquake

in Proceedings of the 7th National Congres on Theoretical and Applied Mechanics (2006)

This article presents some basic aspects of a research about the evaluation of the effect of earthquakes on storage racking systems. In particular, it focuses on the possible sliding and friction of the ... [more ▼]

This article presents some basic aspects of a research about the evaluation of the effect of earthquakes on storage racking systems. In particular, it focuses on the possible sliding and friction of the stored good subjected to a horizontal inertial force. In the first part, a theoretical SDOF system is studied to derive general indications on the sliding behavior and to serve as a reference for the validation of a more advanced numerical model. The second part presents then an application of the numerical model to simple rack structures. [less ▲]

Vereinfachtes Verfahren zur Abschätzung der Wirkung der Nichtlinearität der aerodynamischen Koeffizienten

in Stahlbau (2006), 75(5), 380-388

Wind analysis of a structure subjected to non-linear random dynamic loading Since the early developments in wind engineering, aerodynamic coefficients have been linearized in turbulence analysis. On the ... [more ▼]

Wind analysis of a structure subjected to non-linear random dynamic loading Since the early developments in wind engineering, aerodynamic coefficients have been linearized in turbulence analysis. On the other hand general and complex methods based on generalized power spectral densities can now handle this kind of non linearity. Between these two extremes, it would be desirable to give simple estimation of the effects of the non linearity of aerodynamic coefficients on the response of structures. This paper aims at giving an overview of these general and complex methodologies (that could be applied in other contexts), and, in a second step, presenting an original procedure to give estimation of the effects of the non linearity of aerodynamic coefficients. This procedure will be illustrated on the drag coefficient of the Viaduct of Millau [less ▲]

Estimations of the Influence of the Non-Linearity of the Aerodynamic Coefficients on the Skewness of the Loading

in Proceedings of the 6th Asia-Pacific Conference on Wind Engineering (2005)

This paper is devoted to the non linear quasi-steady aerodynamic loading. A linear approximation is often used to compute the response of structures to buffeting forces. Some researchers have however ... [more ▼]

This paper is devoted to the non linear quasi-steady aerodynamic loading. A linear approximation is often used to compute the response of structures to buffeting forces. Some researchers have however shown that it is possible to account for the non linearity of this loading. This non linearity can come (i) from the squared velocity or (ii) from the shape of the aerodynamic coefficients (as functions of the wind angle of attack). In this paper, we show that this second origin can have significant implications on the design of the structure, particularly when the non linearity of the aerodynamic coefficient is important (obvious, isn’t it?) or when the transverse turbulence is important. This paper is devoted to the non linear quasi-steady aerodynamic loading. A linear approximation is often used to compute the response of structures to buffeting forces. Some researchers have however shown that it is possible to account for the non linearity of this loading. This non linearity can come (i) from the squared velocity or (ii) from the shape of the aerodynamic coefficients (as functions of the wind angle of attack). In this paper, we show that this second origin can have significant implications on the design of the structure, particularly when the non linearity of the aerodynamic coefficient is important (obvious, isn’t it?) or when the transverse turbulence is important. [less ▲]

Application des méthodes d'analyse stochastique à l’étude des effets du vent sur les structures du génie civil

Doctoral thesis (2005)

In the civil engineering field, the analysis of structures subjected to wind loading is generally based on several hypotheses. Their justification is often fuzzy and they are usually postulated in order ... [more ▼]

In the civil engineering field, the analysis of structures subjected to wind loading is generally based on several hypotheses. Their justification is often fuzzy and they are usually postulated in order to apply simplified mathematics. These hypotheses allow the resolution to be run in a gaussian context. This work aims at presenting and applying an analysis which allows accounting for the usually neglected terms of the loading. When studying multi degree of freedom structures, other simplifications concerning the coupling effects between modes are generally formulated. These conditions are also approached and several solutions to take them (eventually partially) into account are proposed. From the simplest analysis of a single degree of freedom system subjected to a simple aerodynamic loading, this work presents more and more complex structures. The last step is to present to developments necessary to analyse a real structure. The developments will allow to analyse a linear 3-D structure subjected to a 3-D aerodynamic field whose non linear characteristics are taken into account. These non linear effects can come from the quadratic terms in the expression of the turbulence and from the non linearity of the aerodynamic coefficients in terms of the wind angle of attack. [less ▲]