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Influence of strain rate on stress-strain dependencies of aortic tissues
Slažanský, Martin ; Fuis, Vladimír (referee) ; Burša, Jiří (advisor)
The thesis deals with the influence of strain rate on stress-strain dependencies of aortic tissues to estimate the error of hyperelastic models, which are neglecting the viscoelastic effects that are typical for soft biological tissues. It was found by the experiment and the subsequent evaluation that in the range of the strain rate from 0,167 to 5,000 mm/s the influence of strain rate on stress-strain dependencies is negligible. The deviation by transition from experimental data to a constitutive model was significantly larger than the deviation between the data sets varying at different strain rates, which means that the use of stress-strain curves varying at different strain rates in given range of the strain rate has no effect on the resulting model. The best of analysis models that were examined in this thesis appears to be the Yeoh hyperelastic model using the FEM.
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Life-time assessment of bridge based on nonlinear analysis and degradation modelling
Kucek, Martin ; Lehký, David (referee) ; Novák, Drahomír (advisor)
The aim of this work is to calculate the lifetime period of the bridge construction based on the nonlinear analysis and the degradation modelling. As a solution was the probabilistic nonlinear finite element analysis. The nonlinear numerical analysis is provided by the programme ATENA, developed by the Červenka Consulting. We have modeled one prefabricated bridge beam KA-73, which was overloaded by power effects until the structure was damaged. Observed limit states, limit state of the decompression, crack formation and limit state of the bearing were compared with characteristic material. It is possible to determine the maximum weighted capacity for the given construction based on discovered values.
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Steel Structure of Footbal Grandstand
Kloss, Tomáš ; Pilgr, Milan (referee) ; Hron, Lukáš (advisor)
The aim of this bachelor´s thesis is to design and check the football grandstand roof construction with ground plan dimensions of 30 x 105 m and a height of 20.5 m. Climatic loading is determinated for the location of the construction site - Ostrava. The resulting structural system was chosen spatially co-composed of trusses, purlins trusses, transverse and longitudinal stiffeners, columns and struts. The shape of the roof, which commemorates the air wing, is creating difficult conditions for wrapping air currents. Parts of the work are: technical report, structural analysis of the main structural elements and selected connections and drawings. The computational model for determination of internal forces is implemented in Scia Engineer. The review is created manually according to valid European standards.
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Static solution of timber structure
Burza, Martin ; Zídek, Rostislav (referee) ; Brdečko, Luděk (advisor)
The Bachelor thesis is focused on an analysis of a wooden house truss. The first part deals with the load acting on spatially complex roof structure which is modeled in the Scia Engineer 2012 analysis software. Furthermore, the work considers the most stressed cross sections of wood elements and selected joints. In conclusion, the Bachelor´s thesis evaluates the original construction design.
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Static analysis of wooden truss
Cicálková, Eliška ; Zídek, Rostislav (referee) ; Vlk, Zbyněk (advisor)
Bachelor work is processed as static calculation of traditional wooden roof. For analysis of structural model is used program using finite element method (FEM) - Dlubal RFEM 4. According to the actual implementation is modeled brace calculating model. Here separate construction elements are assessed the first and the second limit states - ultimate limit state and serviceability limit state. Nail connection is maked at the close of work. It´s connections of roof tie and rafter.
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Nonlinear analysis of reinforced concrete structures
Král, Petr ; Salajka, Vlastislav (referee) ; Hradil, Petr (advisor)
The aim is to design and evaluate nonlinear beams analysis, which will be subjected by four – point bending. Nonlinear analysis will be performed and evaluated on three beam models, the first of which will be made from plain concrete, the second of which will be made from reinforced concrete with reinforcement bars in the domain of tensile stress and the third of which will be made from reinforced concrete with reinforcement bars in domains of tensile and compressive stress. The thesis will be included formation of appropriate FE models, performance of nonlinear calculations with using nonlinear material model from a library of nonlinear material models multiPlas in the programming environment of software ANSYS and subsequent evaluation of results. Evaluation of results will consist from evaluation of nonlinear beams analysis and from evaluation of beams analysis according to ČSN EN 1992 – 1 – 1 without reinforcement bars and with reinforcement bars in these variants, next from comparison of nonlinear beams analysis with a beams analysis according to ČSN EN 1992 – 1 – 1 and finally from evaluation of the yield condition, which will be applied to the beams.
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Modelling of traditional timber roof trusses
Vitásková, Petra ; Brdečko,, Luděk (referee) ; Zídek, Rostislav (advisor)
Bachelor’s thesis "Modelling of traditional timber roof trusses," analyzes the behavior of traditional timber roof trusses. Based on the actual design of roof trusses beam computational models are created, individual structural elements are assessed on the first and second limit state and some connections are considered. For the analysis of planar and three-dimensional model FEM programme SCIA Engineer 2011.1 is used.
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Static analysis of arch bridge structure
Farkasová, Zuzana ; Zídek,, Rostislav (referee) ; Hradil, Petr (advisor)
The main task of the Bachelor´s thesis is to do a static analysis of arch bridge construction with two span and bridge deck hanged on pulled cables. My task was to construct numerical model of bridge construction, to make load solution and to evaluate results. I have learned about ANSYS programme during processing this thesis, especially about its working environment WORKBENCH.
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