Percorrer por autor "Virtuoso, Francisco"
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- Analysis of the interactive buckling in stiffened plates using a semi-analytical methodPublication . Ferreira, Pedro; Virtuoso, Francisco
- Design curves for stiffened plates with the unloaded edges free from stresses used in steel box girder bridgesPublication . Ferreira, Pedro; Virtuoso, Francisco
- A semi-analytical model for the nonlinear stability analysis of stiffened platesPublication . Ferreira, Pedro; Virtuoso, FranciscoThis paper presents a computational semi-analytical model for the post-buckling analysis and ultimate strength prediction of stiffened plates under longitudinal uniform compression. The possibility of considering fully free in-plane displacements at longitudinal edges (or unloaded edges) is the innovation of this model over existing models, where these displacements are assumed constrained to remain straight. Comparisons between the semi-analytical model results and nonlinear finite element model results are presented. This study shows that the developed semi-analytical model predicts with accuracy the elastic critical buckling stress, the buckling modes, the ultimate strength and the failure modes obtained through the nonlinear finite element method. The semi-analytical model enables versatile and comprehensive analysis of results and it is computationally efficient when compared with the nonlinear finite elements methods.
- Stiffened flanges used in steel box girder bridgesPublication . Ferreira, Pedro; Virtuoso, FranciscoThis paper presents a design method for stiffened flanges used in steel box girder bridges based on a set of design curves that take into account all relevant parameters regarding the ultimate strength of stiffened flanges, including the real boundary conditions for the inplane displacements at the edges. These design curves were developed and calibrated based on the results obtained with nonlinear analysis using the semi-analytical and finite element methods and they were validated by comparison with the results of experimental tests in accordance with the target failure probability of the European standard EN-1990. A comparison between the ultimate strength obtained using the proposal design curves with that obtained using the nonlinear analysis and the current bridge design rules is presented.