Investigation on the down-aisle ductility of multiple bay pallet racks by means of pushover analyses

Bové, Oriol; Casafont, Miquel; Bonada, Jordi; Ferrer, Miquel; Almansa, Francisco López

doi:10.1016/j.engstruct.2023.116085

Cited by 5 publications

(7 citation statements)

References 20 publications

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“…This issue can be explained by the soft-story mechanism produced in the first level, which cannot be accurately reproduced without accounting for sectional distortion. Figure 13 displays the deformed shape of the first upright level of 3D-SC, presented in [11]. This type of nonlinearity displayed in Figure 13 could be somehow accounted for in 3DBEAM or 2DBEAM(Eq) models by the use of nonlinear springs placed below the upright levels; previous research works have successfully done it [17].…”

Section: Nonlinear Static Analysesmentioning

confidence: 94%

“…The models consist of one continuous upright segment with adjacent half-span beams (Figure 6); the beam end nodes of each level have all their degrees of freedom coupled. This model is validated for gravity and lateral loads in previous research [11][12].…”

Section: Numerical Modelsmentioning

confidence: 99%

“…Nonlinear pushover analyses are performed to RACK I and RACK II using 2DBEAM(Eq) and 3DBEAM models. Figure 12 displays the resulting capacity curves for the two models an two racks; the results of the pushover analysis of 3D-SC, presented in [11], are also displayed. The displacement ratio (%) is computed as the lateral displacement (in x) over the total height of the rack, while V (kN) is the shear reaction at the floor.…”

Section: Nonlinear Static Analysesmentioning

confidence: 99%

“…Four models are compared: the three presented in this paper, plus an additional one made with shell elements (3D-SC), presented in [11].…”

mentioning

confidence: 99%

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Comparison between numerical models for unbraced multiple bay pallet racks

Bové,

Casafont,

Bonada

et al. 2023

ce papers

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Unbraced pallet racks are cold‐formed steel structures intended for the storage of products. They are subjected to severe lateral actions, and are particularly instability prone in the down aisle direction. Therefore, their design is compromised and needs of an accurate modelling. In current design practice, models using simplified beam formulations are regularly considered (such as Euler‐Bernoulli or Timoshenko), being them not able to reproduce torsional warping, or cross‐sectional distortion; these phenomena are accounted for indirectly via reduced sectional properties, and in the post‐process. This paper presents a comparison between three single column models, intended for the modelling of racks with a significant number of bays. Three models are presented: –Two 2D beam models using gross and equivalent section properties –A 3D beam model using equivalent section properties. Additionally, the results of these analyses are compared with those of a 3D model using shells and beams, presented in a previous research paper. Two rack configurations with different level heights are considered. The aim of this study is to capture the influence perforations of the uprights, warping, eccentricities and cross‐sectional distortion in the nonlinear response of racks subject to severe lateral actions.

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Section: Nonlinear Static Analysesmentioning

confidence: 94%

Section: Numerical Modelsmentioning

confidence: 99%

Section: Nonlinear Static Analysesmentioning

confidence: 99%

“…Four models are compared: the three presented in this paper, plus an additional one made with shell elements (3D-SC), presented in [11].…”

mentioning

confidence: 99%

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Comparison between numerical models for unbraced multiple bay pallet racks

Bové,

Casafont,

Bonada

et al. 2023

ce papers

Self Cite

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“…A cyclic symmetry condition was imposed between the two beam ends at each level, consisting of coupling all their degrees of freedom (Figure 6). This model, with slight modifications, was presented in previous research [26].…”

Section: Shell Finite Element Model Of the Structurementioning

confidence: 99%

Global Analysis of Adjustable Pallet Rack Down-Aisle Frames Using the Generalised Beam Theory

Bonada,

Bové,

Casafont

et al. 2024

Applied Sciences

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A global analysis of a rack frame conducted using the Generalised Beam Theory (GBT) is presented. This study specifically focuses on a down-aisle frame, showing the particular characteristics of this type of structure, such as its perforated columns, semi-rigid joints, and significant second-order effects. The single-column simplified approach is applied, meaning that the entire rack is modelled with one single column and its adjacent half-beams. This approach substantially reduces modelling time and allows for very quick parametric studies while adequately reproducing the general 2D down-aisle behaviour. The GBT single-column model is first verified against a similar single-column shell finite element model used by the authors in previous research. Afterwards, the model is applied to study the effects of various factors influencing the results of a rack global analysis, including perforations, imperfection magnitudes and combinations, and sectional deformations. The nature of GBT allows for deriving clear conclusions on the influence of these aspects on structural behaviour. Furthermore, this article also aims to demonstrate the potential advantages of the theory for performing global analyses of these structures in both research and design.

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