Jan Valeš
Brno University of Technology
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Publication
Featured researches published by Jan Valeš.
Journal of Civil Engineering and Management | 2017
Zdeněk Kala; Jan Valeš; Jeppe Jönsson
AbstractThe elastic load-carrying capacity and buckling trajectory of steel columns under compression with open and hollow cross-sections, whose axis is curved by spatial random fields, are studied in the article. As a result of the spatial curvature of the axis the cross-sections are subjected to compression, bending and torsion from the onset of loading. Numerical simulations are performed using the geometrically non-linear model created using the ANSYS software package. Each simulation run has input random realizations of yield strength and the random field generated using the Latin Hypercube Sampling method. In the plane perpendicular to a perfectly straight column axis, the random observations of deformation trajectories of a node in the middle of the column height are studied. The increasing compression load moves the node along the curve path (open sections) or along the linear path (hollow sections). Large discrepancies in the deformation trajectories of open sections (curvilinear paths) and hollo...
PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON NUMERICAL ANALYSIS AND APPLIED MATHEMATICS 2014 (ICNAAM-2014) | 2015
Zdeněk Kala; Jan Valeš
In the present paper, deformations of a beam under equal end moments solved with influence of lateral buckling are studied. It has been found by numerical studies that the lateral deflection of slender beam under major axis bending can be relatively high.The acceptability of high values of lateral deflections within the framework of serviceability limit state is discussed. In the next part of the paper, the limit value of maximum deflection was introduced as a fuzzy number. The fuzzy analysis of the maximum moment which causes the maximum deflection was carried out. The slendernesses of beams for which the serviceability limit state is the limiting state for design were identified.
Applied Mechanics and Materials | 2015
Jan Valeš; Zdenek Kala; Jindrich Melcher
Deformations of an I-section steel beam under equal end moments are studied in this article. Initial geometric imperfection of the beam axis was introduced according to the Eurocode standard. Numerical studies have shown that the lateral deflection of slender beams under major axis bending can be relatively high. The acceptability of high values of lateral deflections within the framework of the serviceability limit state is discussed. In the next part of the paper, the limit value of maximum deflection was introduced as a fuzzy number. Fuzzy analysis of the maximum moment, which causes maximum deflection, was performed. The slenderness values of beams for which the serviceability limit state is the limiting condition for design were identified.
Engineering Structures | 2017
Zdeněk Kala; Jan Valeš
Journal of Constructional Steel Research | 2017
Zdeněk Kala; Jan Valeš
Archive | 2018
Jan Valeš; Zdeněk Kala
Archives of Civil and Mechanical Engineering | 2018
Zdeněk Kala; Jan Valeš
Procedia Engineering | 2017
Jan Valeš; Tudor-Cristian Stan
Procedia Engineering | 2017
Zdeněk Kala; Jan Valeš; Josef Martinasek
International Journal of Mathematical and Computational Methods | 2016
Jan Valeš; Zdenek Kala; Josef Martinasek