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Dive into the research topics where Jan Valeš is active.

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Featured researches published by Jan Valeš.


Journal of Civil Engineering and Management | 2017

Random fields of initial out of straightness leading to column buckling

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

Fuzzy analysis of serviceability limit state of slender steel beam under bending

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

Application of Fuzzy Set Theory to the Serviceability Limit State of a Steel Beam under Bending

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

Global sensitivity analysis of lateral-torsional buckling resistance based on finite element simulations

Zdeněk Kala; Jan Valeš


Journal of Constructional Steel Research | 2017

Sensitivity assessment and lateral-torsional buckling design of I-beams using solid finite elements

Zdeněk Kala; Jan Valeš


Archive | 2018

Mesh convergence study of solid FE model for buckling analysis

Jan Valeš; Zdeněk Kala


Archives of Civil and Mechanical Engineering | 2018

Imperfection sensitivity analysis of steel columns at ultimate limit state

Zdeněk Kala; Jan Valeš


Procedia Engineering | 2017

FEM Modelling of Lateral-Torsional Buckling Using Shell and Solid Elements

Jan Valeš; Tudor-Cristian Stan


Procedia Engineering | 2017

Inelastic Finite Element Analysis of Lateral Buckling for Beam Structures

Zdeněk Kala; Jan Valeš; Josef Martinasek


International Journal of Mathematical and Computational Methods | 2016

Solving Lateral Beam Buckling Problems by Means of Solid Finite Elements and Nonlinear Computational Methods

Jan Valeš; Zdenek Kala; Josef Martinasek

Collaboration


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Zdeněk Kala

Brno University of Technology

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Zdenek Kala

Brno University of Technology

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Josef Martinasek

Brno University of Technology

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Jindrich Melcher

Brno University of Technology

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Jeppe Jönsson

Technical University of Denmark

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Tudor-Cristian Stan

Technical University of Denmark

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