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Buckling analysis of the load-bearing system
Majer, Tomáš ; Löffelmann, František (referee) ; Šplíchal, Jan (advisor)
The research part of the work summarizes the knowledge in the field of calculation of buckling stability and methods of heat transfer. The next part deals with the calculation of the buckling stability of two types of samples using an analytical approach, finite element method, and verified using experimental measurements. Finally, the work deals with CFD calculation for determining the temperature field on the examined samples, which is used to calculate the buckling stability with temperature influence.
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Steel Beam Structure Optimization
Lamoš, Radek ; Eliáš, Jan (referee) ; Frantík, Petr (advisor)
The main subject of this work is to find ideal solution of the steel frame structure and offer the best solution to investors. The aim is to get know how steel structures works, write down internal forces when parametres are changing. Parameters can be profiles, loads or many others. The output should be perfectly optimized construction. The content combines theory of structural mechanics and designing steel structures. This project could be very useful in practice designing of steel frame structures with the possibility of expansion by other parameters.
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Evaluation of buckling risk at beams made of two various materials
Zvěřina, Martin ; Dušek, Daniel (referee) ; Burša, Jiří (advisor)
Aim of this work is evaluation of buckling risk at beams made of two various materials and delimitation limits for critical power buckling beam from two various materials by the help of relations for prismatic beam. Further is here processed analyst determination critical force buckling for free beam from two various materials and also analyst determination critical force buckling for fixed beam from two various materials.
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Modeling the initial curvature of members in the analysis of structural models
Aligerová, Jana ; Martinásek, Josef (referee) ; Vlk, Zbyněk (advisor)
This bachelor’s thesis deals with the reaction of pressed indirect members in terms of their stability. Three models of indirect members with different types of curvature will be used for the solution – a member model with initial curvature, a member model with initial benting and a member model indirect due to load. For these three models, a parametric study of the member will be made in which a calculation will be performed on a member with initial properties identical for all types of models. In the next section, the dependence of critical force and initial deflection on the behaviour of the member models with initial curvature and benting will be investigated. Furthermore, the member design will be carried out in terms of load carrying capacity. In this design, a comparison will be made between the simplified method of calculation on the curved members and the design in terms of the buckling strength concept. The acquired knowledge in the field of stability theory on an indirect member will be applied to the real structure of the lookout tower Borůvka near Hluboká.
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Buckling of Plastic Specimens Manufactured by 3D Printing
Seidler, Lukáš ; Horák, Marek (referee) ; Löffelmann, František (advisor)
The bachelor’s thesis deals with the problematics of loss of stability in specimen created using the 3D printing technology. The beginning is devoted to a quick familiarization with the problems of 3D printing and a quick overview of the common faults present in the final products. For the purpose of testing the stability there were designed special testing specimens. Their theoretical values of critical force were than calculated using analytical and Finite Element approach. These values were than verified by testing the specimen inside a LabTest 6.500 machine and results were evaluated as per norm. The results clearly indicates that the theoretical force values are always bigger than the measured ones. Differences between these two are compared in multiple of graphs at the end of this thesis.
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Critical power and force during continuous and intermittent contraction of finger flexors
Malečková, Lucie ; Baláš, Jiří (advisor) ; Kodejška, Jan (referee)
Title: Critical power and force during continuous and intermittent contractions of finger flexors Objectives: The aim of the study was to determine critical force of finger flexors during continuous exercise and to determine critical power at different work - relief ratios during intermittent exercise. Methods: Eight participants volunteered in the study (age 23,1 ± 1,8 years, height 172,9 ± 7,3 cm, body mass 67,1 ± 4,8 kg, climbing experience 5,4 ± 2,1 years and climbing performance from 6 to 8 on the Union International des Associations d'Alpinisme scale). Participants undertook one continuous and three intermittent handgrip contractions (work to relief ratio of 8:2, 7:3, 6:4) to failure at 60% and 40% maximal voluntary contraction (MVC) for dominant and non-dominant hand, respectively. For continuous contraction, the critical force was calculated from two exercises at 40% and 60% MVC and inversed time to failure using linear regression analysis; for intermitent contraction, the critical power was calculated from the three contraction ratios and inversed time to failure using linear regression analysis. Results: Critical force for continuous contraction was found at 20,4 ± 5,9 % MVC. The critical power for intermittent contractions was considered not to be valid and is not indicated. Conclusion:...
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Evaluation of buckling risk at beams made of two various materials
Zvěřina, Martin ; Dušek, Daniel (referee) ; Burša, Jiří (advisor)
Aim of this work is evaluation of buckling risk at beams made of two various materials and delimitation limits for critical power buckling beam from two various materials by the help of relations for prismatic beam. Further is here processed analyst determination critical force buckling for free beam from two various materials and also analyst determination critical force buckling for fixed beam from two various materials.
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Steel Beam Structure Optimization
Lamoš, Radek ; Eliáš, Jan (referee) ; Frantík, Petr (advisor)
The main subject of this work is to find ideal solution of the steel frame structure and offer the best solution to investors. The aim is to get know how steel structures works, write down internal forces when parametres are changing. Parameters can be profiles, loads or many others. The output should be perfectly optimized construction. The content combines theory of structural mechanics and designing steel structures. This project could be very useful in practice designing of steel frame structures with the possibility of expansion by other parameters.
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