Ostrava, Czech Republic
Ostrava, Czech Republic

The Technical University of Ostrava is a university located in the city of Ostrava, Moravian-Silesian Region, Czech Republic. The institution was founded on 23 January 1849 as the Mining Academy in Příbram. In 1894 it was promoted to university status and in 1904 it was renamed to Vysoká škola báňská. In 1945 it was moved to Ostrava, then the centre of Czechoslovak mining industry.Today the university has a total of about 20,000 students and consists of the following seven faculties: Faculty of Economics Faculty of Civil Engineering Faculty of Mechanical Engineering Faculty of Electrical Engineering and Computer Science Faculty of Mining and Geology Faculty of Metallurgy and Material Engineering Faculty of Safety Engineering Wikipedia.


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Cajka R.,VSB - Technical University of Ostrava
Applied Mechanics and Materials | Year: 2013

In case of constructions placed on subsoil, it is necessary to create a rigidity matrix for the element subsoil. That rigidity matrix should be then added up in respective positions with the rigidity matrix of an element. To clarify the proposed model of the subsoil, a method is derived for determination of vertical subsoil stress analysis under any shape of a slab construction by means of numerical integration and theory of isoparametric elements using the Jacobian transformation. This approach is rather original and represents the key contribution of this work in interaction solutions. Using the proposed approach, the method can be employed for any shape of a finite element. © (2013) Trans Tech Publications, Switzerland.


Cajka R.,VSB - Technical University of Ostrava
Advanced Materials Research | Year: 2013

This article presents the method of determination of friction parameters for soil - structure interaction with and without slide joints in the subsoil of structures. The results for constant and nonlinear distribution of C1x, C1yparameters are compared and derived friction parameters have been used for the FEM calculation of the stress condition of the real foundation structures. © (2013) Trans Tech Publications, Switzerland.


Cajka R.,VSB - Technical University of Ostrava
Advanced Materials Research | Year: 2013

Stress strain analysis of elastic halfspace by means of Gauss numerical integration and Jacobean of transformation is presented. The arbitrary shape and general course of the loaded area in nodal points is allowed by use of 4- and 8-node isoparametric elements, numerical integration and Jacobean transformation. Results of numerical examples are compared with other solutions. © (2013) Trans Tech Publications, Switzerland.


Toloo M.,VSB - Technical University of Ostrava
Measurement: Journal of the International Measurement Confederation | Year: 2013

Data envelopment analysis (DEA) has been a very popular method for measuring and benchmarking relative efficiency of each decision making units (DMUs) with multiple inputs and multiple outputs. DEA and Discriminant Analysis (DA) are similar in classifying units to exhibit either good or poor performance. On the other hand, selecting the most efficient unit between several efficient ones is one of the main issues in multi-criteria decision making (MCDM). Some proponents have suggested some approaches and claimed their methodologies involve discriminating power to determine the most efficient DMU without explicit input. This paper focuses on the weakness of a recent methodology of these approaches and to avoid this drawback presents a mixed integer programming (MIP) approach. To illustrate this drawback and compare discriminating power of the recent methodology to our new approach, a real data set containing 40 professional tennis players is utilized. © 2013 Elsevier Ltd. All rights reserved.


Zelinka I.,VSB - Technical University of Ostrava
Swarm and Evolutionary Computation | Year: 2015

Swarm and evolutionary based algorithms represent a class of search methods that can be used for solving optimization problems. They mimic natural principles of evolution and swarm based societies like ants, bees, by employing a population-based approach in mutual communication and information sharing and processing, including randomness. In this paper, history of swarm and evolutionary algorithms are discussed in general as well as their dynamics, structure and behavior. The core of this paper is an overview of an alternative way how dynamics of arbitrary swarm and evolutionary algorithms can be visualized, analyzed and controlled. Also selected representative applications are discussed at the end. Both subtopics are based on interdisciplinary intersection of two interesting research areas: swarm and evolutionary algorithms and complex dynamics of nonlinear systems that usually exhibit very complex behavior. © 2015 Elsevier B.V. All rights reserved.


Vavrusova K.,VSB - Technical University of Ostrava
Applied Mechanics and Materials | Year: 2013

The aim of this paper is demonstration of usage possibility of fully probabilistic methods for design and assess of timber structures elements due their expression of material properties with bounded histograms because timber in terms of one strength class shows broad range of strength properties. © (2013) Trans Tech Publications, Switzerland.


Cajka R.,VSB - Technical University of Ostrava
Applied Mechanics and Materials | Year: 2014

At the Faculty of Civil Engineering VSB - TU Ostrava testing device was constructed so that the phenomena of soil - foundation interaction could be experimentally investigated and compared with numerical models. Results of experimental loading test are compared with soil - foundation interaction analysis based on finite element method (FEM). The stress strain analysis of elastic halfspace by means of Gauss numerical integration and Jacobean of transformation is presented here. The arbitrary shape and general course of the loaded area in nodal points is allowed by use of 4- and 8-node isoparametric elements, numerical integration and Jacobean transformation. The objective of this paper is also improving and developing the soil-structure interaction analysis based on the experimental results and FEM. © (2014) Trans Tech Publications, Switzerland.


Mynarcik P.,VSB - Technical University of Ostrava
Procedia Engineering | Year: 2013

Concrete industrial floors must fulfill a number of very specific requirements - adequate flatness, limited cracking and especially sufficient loads capacity. Any break of the requirements and the subsequent failure of the floor structure, would cause difficult repairs and expensive unplanned shutdowns. The main theme of this paper is focused on concrete industrial floors designed primarily for middle and severe operating conditions. The first part describes the actual trends and contemporary technology. The second part is focused on technology of prestressed industrial floors - their possibility of use, advantages, disadvantages and application in the Czech Republic and abroad. © 2013 The Authors. Published by Elsevier Ltd.


Krejsa M.,VSB - Technical University of Ostrava
Safety, Reliability and Risk Analysis: Beyond the Horizon - Proceedings of the European Safety and Reliability Conference, ESREL 2013 | Year: 2014

The paper describes methods used for probabilistic assessment of reliability of steel structures and bridges that are exposed to cyclic loads. Propagation of fatigue cracks from surface and edges is taken into account, the maximum permitted dimension being of particular attention. The model is based on a linear fracture mechanics. Conditional probability is the basis when designing a regular system of inspections for the structure. A new method, which is still under development, has been used for probabilistic modeling of fatigue damage. Direct Optimized Probabilistic Calculation-DOProC-appears to be a very efficient for the computation of probabilities. DOProC provides the solution with only a numerical error and an error resulting from input and output quantities discretizing. © 2014 Taylor & Francis Group, London.


Krejsa M.,VSB - Technical University of Ostrava
Key Engineering Materials | Year: 2014

The paper is focuses on one of probabilistic methods which can be used for failure analysis and reliability assessment of steel structures which are subject to cyclic loads and exposed to fatigue. A particular attention is paid to creation and propagation of fatigue cracks from edges and surface. On the basis of the reliability assessment, a system of inspections is proposed for structural details which tend to be sensitive to fatigue damage. A new probabilistic method which is still under development - Direct Optimized Probabilistic Calculation ("DOProC") - was used for this probabilistic task. This method is the basis of the FCProbCalc code. © (2014) Trans Tech Publications.

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