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Railway track deformation measurement
Leischner, Ludvík ; Bureš, Jiří (referee) ; Švábenský, Otakar (advisor)
This bachelor thesis is about measuring deformations on railway bridge in Znojmo. The horizontal and vertical changes of railway track on the bridge and newly renovated bridge construction were measured by using two independent methods, namely 3D polar method and kinematic GNSS Stop & Go method. The assessment of the longitudinal shifts depending on atmospheric conditions especially the temperature changes is an essential goal of this work. Another key aim is the determination of precision of both independ-ent measuring methods.
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Dynamic analysis of structure loaded seismic loads
Šulerová, Zdeňka ; Nevařil, Aleš (referee) ; Vlk, Zbyněk (advisor)
This thesis deals with the calculation of response of reinforced concrete construction on the effect of seismic tension. Time and spectral analysis were made. They are mentioned as possible ways of calculation in EN 1998 - 1:2004 norm. Final figures of global deformations and stress on selected beam from the time and spectral analysis were firstly compared for the horizontal components of seismic stress affecting only in one direction. Subsequently comparison of time progress to combination of these effects mentioned in relevant norm was made. In the conclusion the results of used analysis are appraised.
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The effect of the shrinkage reducing additives on rheological properties of high-strength concrete
Červenka, Jiří ; Kucharczyková, Barbara (referee) ; Daněk, Petr (advisor)
Master’s thesis examines the effect of the shrinkage reducing additives on rheological properties of high-strength concrete. The first part is focused on high-strength concrete in terms of their composition and properties. The second part contains a detailed analysis of the cementitious composites shrinkage problems. Total shrinkage is divided into individual elementary shrinkages. For each of them there is a detailed description of causes and factors that affect their sizes. The next part describes the basic additives used to reduce the shrinkage of cementitious composites. The experimental part is focused on verifying the effectiveness of the shrinkage reducing additives during preparation of high-strength concrete. Usage of shrinkage drains for relative strain measurement enables to determine the process of shrinkage immediately after placing the concrete in the form and to obtain the overall curve of the hight-strength concrete volume changes during its setting and hardening. At the end of the thesis, there are overall analysis and summary of the results of the performed experiments.
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Measuring the settlement of an apartment building
Kováč, Igor ; Vitula, Alexej (referee) ; Bureš, Jiří (advisor)
The subject of the bachelor’s thesis was the geodetic survey and processing of monitoring of vertical displacements and deformations of an apartment building. The measurement was performed by the method of precise levelling using hanging scales. Prior to surveying, tests were performed on the accuracy of the instrument readings depending on the length to the target and the differences between origins of the scales. The thesis processes three stages of measurement and deals with the process from measurement, through processing, to the production of graphic outputs. The largest value of the vertical displacement of the monitored point was -1.44 mm.
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Measurement of vertical displacements and deformation of the bridge over the river Poprad
Horochonič, Maroš ; Hořejš, Marek (referee) ; Bureš, Jiří (advisor)
The content of this master´s thesis is a geodetic survey of vertical displacements and transformation of the supporting structure of the road bridge over the river Poprad in the 4th period with subsequent processing of measured data, calculation and evaluation of displacements with respect to previous stages. The work also includes the control of devices and aids used in the survey of the bridge construction and the behavior of the device's intentions during tempering. The result of this work are the values of the detected displacements and their graphical interpretation.
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Study of the effect of the addition of the cellulose fibers on the selected properties of concrete
Blaha, Lukáš ; Hela, Rudolf (referee) ; Bodnárová, Lenka (advisor)
This dissertation desribes the behavior of cellulose fiber reinforced concrete. In the theoretical section one can find basic information on cellulose fiber and its methods of production and usage in concrete structures. One can find the information about the effect of high temperature on the mechanical and physical attributes of cellulose fiber reinforced concrete, and also a comparison with other fibers used in concrete based on the research done using scientific literature. Furthermore the details about particular cellulose fibers are provided. In the experimental section the formulas for CHRYSO and GREENCEL concrete are designed. The influence of the addition of various types of cellulose fibers into both liquid and solid states of concrete was researched. Tests were also done on the effect of high temperatures (600 °C and 800 °C) on the firmness and densitiy of concrete, its deformations and visual changes. Furthermore, the resistance of cellulose fibers was monitored by monitoring the development of the pH environment (from pH 4 to pH 12) with long-term deposition of different types of cellulose fibers in these environments.
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Welding of aluminium sizable weldments.
Tkaný, Jan ; Kovář, Petr (referee) ; Daněk, Ladislav (advisor)
This thesis created within the general Bachelor's study gives insight into the basic division of aluminum alloy, a summary of technologies and principles of welding aluminum and its alloys. It is focused on the description of cutting Al alloy and their suitability for welding, the characteristics of different methods and description of problems in the welding of large-scale aluminum weldments. For each of the methods are given the possibility of application, a description and diagram of operation and specifics on the protective gas or electrodes. Problems in the welding of large parts are characterized by external and internal deformations, complex stress fields, where appropriate, the temperature fields. To determine the size of the deflection angle is given an example of the chart for the practical use. In conclusion it is stated that the method is appropriate to apply in case of large weldments.
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Measurement of vertical displacements and deformation of the bridge over the river Poprad
Horochonič, Maroš ; Hořejš, Marek (referee) ; Bureš, Jiří (advisor)
The content of this master´s thesis is a geodetic survey of vertical displacements and transformation of the supporting structure of the road bridge over the river Poprad in the 4th period with subsequent processing of measured data, calculation and evaluation of displacements with respect to previous stages. The work also includes the control of devices and aids used in the survey of the bridge construction and the behavior of the device's intentions during tempering. The result of this work are the values of the detected displacements and their graphical interpretation.
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Measuring the settlement of an apartment building
Kováč, Igor ; Vitula, Alexej (referee) ; Bureš, Jiří (advisor)
The subject of the bachelor’s thesis was the geodetic survey and processing of monitoring of vertical displacements and deformations of an apartment building. The measurement was performed by the method of precise levelling using hanging scales. Prior to surveying, tests were performed on the accuracy of the instrument readings depending on the length to the target and the differences between origins of the scales. The thesis processes three stages of measurement and deals with the process from measurement, through processing, to the production of graphic outputs. The largest value of the vertical displacement of the monitored point was -1.44 mm.
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