2024-03-29T14:02:49Zhttps://www.tdx.cat/oai/requestoai:www.tdx.cat:10803/1334902017-08-31T18:39:21Zcom_10803_183col_10803_228
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Anàlisi del comportament a compressió de perfils prims oberts d'acer conformats en fred
[Barcelona] :
Universitat Politècnica de Catalunya,
2014
Accés lliure
http://hdl.handle.net/10803/133490
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Bonada Bo, Jordi,
autor
1 recurs en línia (284 pàgines)
Tesi
Doctorat
Universitat Politècnica de Catalunya. Departament de Resistència de Materials i Estructures a l'Enginyeria
2014
Universitat Politècnica de Catalunya. Departament de Resistència de Materials i Estructures a l'Enginyeria
Tesis i dissertacions electròniques
Roure Fernández, Francesc,
supervisor acadèmic
TDX
Cold-formed thin-walled steel sections are frequently used in pallet rack structures. This type of cross-sections are normally used as a columns and contains perforations uniformly distributed enabling the connection between other structural elements. One of the most typical reasons of failure for pallet-racking systems is the buckling of the uprights. As a consequence, the calculation of ultimate strength under compression is a key factor for a safe structural design. The influence of distortional and local buckling in cold formed thin-walled sections is really important, whereas the influence in hot-rolled sections (IPN, IPE, HEB, etc) is insignificant. The analysis of distortional and local buckling in the upright behaviour is difficult because the classical beam theories cannot handle sectional deformations. As a result, different new methodologies have been developed and finite element analysis has taken an important role. Several recent research activities are focused to study the buckling behaviour of rack sections under pure compression in order to improve the current design codes. Specifically, most of the present research is dealing with the following factors: interaction effects involving the different modes of buckling, initial geometric imperfections in nonlinear finite element analysis, cold-work effects, residual stresses and its influence in the upright ultimate load and the modelling of the perforations. The present doctoral thesis aims to provide new knowledge in some of the previously cited factors. It has been studied the influence of the cold-work effect, residual stresses and the load carrying capacity of cold-formed steel rack columns via nonlinear finite element analysis. Moreover, several experimental tests have been done in order to validate the numerical results. Furthermore, a new software has been developed to calculate the lineal elastic buckling load for any mode of deformation. These values are used for the current design codes and for a new numerical methodology developed. Keywords: Thin-walled section, rack, geometric imperfection, distortional buckling, GBT, residual stresses, cold-work effects, finite element analysis
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