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Stress-deformation analysis of the high voltage transmission tower
Kuběna, Tomáš ; Pokorný, Jan (referee) ; Fuis, Vladimír (advisor)
The thesis deals with the analysis of a high voltage power pole near the village Lešná, whose collapse will cause an outage of the electricity network in the area. The model of the pole was created on the basis of drawings provided by Arpex Moravia s.r.o. The pole is designed as a truss system using the general node method, subjected to the weight of the structure, wind and the weight of live conductors. The analytical calculation is performed in Matlab and then verified by numerical calculation in Ansys Workbench. When the pole is subjected to all previously mentioned loads, the maximum deformation has a magnitude of u_max=18.89 mm, which is mostly affected by the wind action. The resulting safety to elastic limit state is k_MSP=23.95. The pole is operated with sufficient safety and collapse will not occur under normal operating conditions.
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Model of the bridge for presentation of the member system
Chlup, Pavel ; Krejčí, Petr (referee) ; Appel, Martin (advisor)
In this bachelor thesis, the individual parts of the model bridge structure are explained with a brief commentary on their creation. Subsequently, the computational modelling of the problem using statics and its practical solution using strain gauges and MATLAB software is elaborated upon. The thesis is divided into a total of four chapters, where the first one is devoted to research on the application of statics and strain gauges. Subsequently, the function of each part of the fabricated model is formulated and a static model of the truss system which is equivalent to the fabricated model but is statically indeterminate without further considerations is presented. Then, the principle on which strain gauges are applied to solve the insolvability of the system is explained and as a result, the force action in the truss system as a function of the load is plotted using an application developed in MATLAB software. The result is a comparison of the measured and calculated values in the truss system.
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Stress-deformation analysis of the indoor basketball construction
Kubíček, Daniel ; Kovář, Jaroslav (referee) ; Fuis, Vladimír (advisor)
The topic of this thesis is stress-strain analysis of a basketball structure in a gymnasium. This structure is divided into two parts. One part is modeled as a spatial bar system. The other part is modeled as a plane bar system. The first part of the paper deals with the research on the use of bar systems in sports. This is followed by the development of analytical computational models of the spatial and plane bar systems. These models are then used to calculate three different loading conditions. Subsequently, the models are developed for numerical solution. In the last part of this work, the analytical solution is verified by the numerical solution.
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Stochastic finite element method to solve 2d problems
Liščák, Milan ; Boháč, Petr (referee) ; Návrat, Tomáš (advisor)
The thesis focuses on programming of algorithms based on the finite element method (FEM) and the stochastic finite element method (SFEM) used for deformation and stress analysis of truss and plane stress problems. All the codes are developed using a free to use program PyCharm. For both trusses and plane stress problems, the algorithm is illustrated with a simple problem and verified on a more complex one. The results from the FEM calculations are validated using results from ANSYS Workbench. The computed displacements and reaction forces are equal to ANSYS results for all solved cases. There are minor deviations in the stress calculations for plane stress problems. The reason for this is unknown, as ANSYS does not provide an exact methodology for stress computing. In SFEM calculations, the values of Young’s modulus, yield strength and load forces are normally distributed. The codes are run repeatedly and based on the variability of the results the probability of failure is calculated.
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Stress and deformation analyses of the bridge near the Jedov mill
Hort, Michal ; Kovář, Jaroslav (referee) ; Fuis, Vladimír (advisor)
Bridges serve to many people every day, so it is necessary to be concerned about theirsafety. Analysis of bridge superstructures are used to increase their safety - and this is also the mainsubject of this thesis. Specifically, it is the analysis of the pedestrian bridge located near Jedov Mill on the Oslava river. For the stress and strain calculations, the method of joints is used, and that iscompared with the finite element method. During the comparison of the methods which hadbeen used, it was found, that the method of joints is suitable for identifying critical points, but cannot accurately determine stress values. While the finite element method can both, identify critical locations and determine the exact stress values. These calculations determinedthe critical locations on the footbridge, which are in the outmost members of the structure. By enlarge their cross-section would increase the safety of the structure. Among the critical trusses do not belong trusses damaged by the footbridge crash. The safety factor of the pedestrian bridge to the elasticity limit state, which is k = 1.74, provides a sufficient reserve for the further use of the footbridge, even if the cross-sections of the above mentioned members are not increased.
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Stress-strain analysis of a crane arm
Mora, Lukáš ; Halabuk, Dávid (referee) ; Fuis, Vladimír (advisor)
The content of this bachelor’s work is a summarization of types of tower cranes and subsequent stress-strain analysis of the crane arm of the crane type 150EC-B8 Litronic located on the Šumavská street in Brno. Analytical stress-strain analysis is calculated with equations of equilibrium using joint method in various types of loading of the construction with MAPLE software. Numerical calculation is executed on 3D model of the construction in software ANSYS. The aim of this bachelor work is the verification of the correctness and comparison results of analytic calculation with numeric calculation and evaluation of the results from a limit states and deformation standpoint.
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Optimization in engineering problems
Čepl, Ondřej ; Popela, Pavel (referee) ; Mrázková, Eva (advisor)
This bachelor's work engages optimization and its improvement in engineering cases. There are defined basic terms and optimization's cases, basic characteristics of the optimization case are accounted and basic methods of their solutions are understated. These teoretic findings are availed by optimization of the measurements of three-bar truss, whereas there are solved two options of optimization's case. Mathematical models are implemented to programm GAMS and at the conclusion is accomplished disccusion of accomplishments.
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Stress-strain analysis of Kozlov lookout tower
Winter, Josef ; Vaverka, Jiří (referee) ; Fuis, Vladimír (advisor)
Bachelor thesis is aimed at stress and deformation analysis of strut frame. The object of interest is lookout tower Kozlov close to the city of Česká Třebová in region of Ústí nad Orlicí in Pardubice Department. The main aim is to simplify 3D model of strut frame and its analysis. At the beginning I deal with history of lookout towers, theoretical introduction of bar, strut frames and limit states. Then follows modelling of 3D model with modified topology of bars and following calculation for different static loading and calculation for static determination. At the end numerical calculation was done to compare chosen model with analytic solution.
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Proposal of a program for solving of problems of simple tension/compression of bars and strut frames
Martínek, Tomáš ; Kubík, Petr (referee) ; Polzer, Stanislav (advisor)
The aim of this work is a program that will solve problems from the simple tension /compression bars and strut frames in the range of bachelor. The work consists of two programs developed in the Borland Delphi development environment. The programs allow the user to define a bar (strut frames) on the basis of the geometrical parameters and constraints, determine the rate of statical indetermination, make the necessary calculations and, if necessary, indicate the condition of deformation (a program for solving bars). The written part of the work serves as a manual.
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Stress-strain analysis of the bar system
Pop, Miroslav ; Profant, Tomáš (referee) ; Houfek, Martin (advisor)
This bachelor’s thesis deals with the issue of rod systems, which represent a special type of construction widely used in the building and mechanical industry. In the introductory part is presented a theoretical basis and methods of static solution of rod systems are described, then it is described stress of rod systems and are derived relations that were subsequently used for the calculation of the specific example. In the practical part, the thesis deals with the analytical calculation of the planar rod system in shape of a power line pylon, for which the cross-sections of the members are designed and the magnitude of the stresses and deformation displacements are calculated. For the calculation, the general method of joints was used and cross sections were designed with respect to the elastic limit state and the buckling stability limit state. At the end of the work, the results of the analytical calculation were verified with numerical solution in software ANSYS Workbench.
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