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Image based smoke and fire detection
Ďuriš, Denis ; Burda, Karel (referee) ; Přinosil, Jiří (advisor)
This diploma thesis deals with the detection of fire and smoke from the image signal. The approach of this work uses a combination of convolutional and recurrent neural network. Machine learning models created in this work contain inception modules and blocks of long short-term memory. The research part describes selected models of machine learning used in solving the problem of fire detection in static and dynamic image data. As part of the solution, a data set containing videos and still images used to train the designed neural networks was created. The results of this approach are evaluated in conclusion.
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Study of the influence organic fibres on the fire resistance of concrete
Klobása, Jan ; Přikryl, Jan (referee) ; Sedlmajer, Martin (advisor)
The master thesis is focused on current issues of concrete behaviour under high temperatures. In the theoretical part, a search of knowledge about changes in concrete, which take place when exposed to thermal loads, which simulates the effect of fire, is performed, and summarized. It is also important to summarize the changes in the individual components that are used to produce concrete. This work describes the effect of high temperatures on mechanical and physical properties as well. There is an information about the most used fibres and their function in concrete. Emphasis is placed on describing the possibility of using recycled PET or cellulose fibres due to the positive environmental impact. In the experimental part, recipes with different types and amounts of fibres are proposed. The subject of the research was to determine how individual types and amounts of fibres affect the physical mechanical properties of concrete and their suitability for use at high temperatures. Microscopic scanning and study of changes in the structure of concrete was also performed.
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Fire safety of wood structures
Čtvrtečková, Lenka ; Šmak, Milan (referee) ; Vaněrek, Jan (advisor)
This bachelor thesis focuses on the description, indication and evaluation of the fire resistance of wooden structures. It describes the procedures used to determine the corresponding fire resistance. It also contains a description of construction systems and fire solutions for selected wooden buildings across the world. This bachelor thesis experimentally verifies the fire resistance of mechanically bonded cross laminated timber boards.
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Evaluation of the structural static condition of the existing structure
Svoboda, Štěpán ; Láník, Jaromír (referee) ; Schmid, Pavel (advisor)
This thesis focuses on the assessment of the structural-statical condition of a building affected by a fire. The purpose of the evaluation is to determine the extent of damage and explore possibilities for future use. The theoretical part introduces the issue of fires in various structures and examines the impact of fire on different types of materials and constructions. In the practical part, there is an own evaluation of the object, a static assessment, the results of the inspection and a summary of the conclusions from the evaluation.
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Mechanical fracture parameters of concrete after exposure to high temperatures
Bejček, Michal ; Keršner, Zbyněk (referee) ; Šimonová, Hana (advisor)
The diploma thesis is focused on the evaluation of mechanical fracture parameters of concrete after exposure to high temperatures. In the introductory theoretical part general principles of fracture mechanics with the concentration on a linear elastic fracture mechanics and non-linear fracture models for the concrete are summarized. The meaning of the three-point bending fracture test used for determination of fracture parameters is also explained. Further the influence of high temperatures on the partial components of concrete and general modeling of temperature loading is described. The practical part is concerned with the evaluation of fire experiments on the concrete panels including numerical simulations using GiD and ATENA software. The evaluation of data obtained from the three-point bending test carried out on specimens with initial stress concentrator taken from concrete panels is a main part of the diploma thesis. The values of modulus of elasticity, effective fracture toughness, work of fracture and fracture energy are determined from the measured F–d and F–CMOD diagrams after their proper corrections in the GTDiPS application. The evaluation of the selected mechanical fracture parameters was performed by StiCrack software using effective crack model and work of fracture method and DKFM_BUT software using the double-K fracture model. Finally, the attention is paid to the analysis of the obtained data.
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Diagnostic properties of concrete exposed to high temperatures
Hudský, Petr ; Sitek,, Libor (referee) ; Bodnárová, Lenka (advisor)
This master’s thesis studies the problems of high temperatures on cement concretes, their following diagnostics from pre-treatment to rehabilitation, the emphasis was on the use of high-speed water jet. In the experimental part of the design of a concrete composition with basalt aggregate. Were reviewed the physico-mechanical properties after thermal loading. The influence of pressure water jet on the thermal load on concrete, pull-off test, the volume of the removed concrete with a strength evaluation and comparison.
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Cathedral today
Klimeš, Jakub ; Mléčka, Jan (referee) ; Štěpán, Marek (advisor)
This project focuses on an ideal solution for restoring the roof of Notre-Dame in Paris, which burned down together with its spire on April 15, 2019. The main motive behind the design was to create a quiet space that will serve as a memorial of the fire and reflect the unity of the society that contributed to the rebuilding found. The primary step of the whole reconstruction is to find an adequate way of renewal and its ethical boundaries. Main attention is focused on the roof and on the spire of the cathedral. As a tribute to medieval builders who consecrated their lives into this magnificent piece of work. The exterior of the new design has the same silhouettes and proportions that it has got eight centuries ago, but with a touch of a modern day aesthetics. When designing the interior of the roof, it was really important to maintain a clear representation of Gothic architecture – the balance between darkness and light. The space is divided into two parts. The first part represents darkness, as an obstacle, which each of us has to overcome. The second part is full of natural light that seems to tear the roof of the cathedral and illuminates the entire space inside. At the heart of the design is a gem that matters the most, life. The spire of the cathedral is designed with four pillars that symbolize the connection of mind-spirit-body with physical world The idea of the spire reflects these seemingly different things, but together they unite into one piece.
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Significance of emergencies modelling using specialized programmes
Ruhásová, Aranka ; Hradil, Jaroslav (referee) ; Fazekas, Monika (advisor)
The Master's Thesis deals with the usage of various software tools in emergency management and in environmental protection. Nowadays, on every step we make, we can face emergency situations which can cause great harm to the environment as well as to human life and property. The theoretical part provides an overview of software tools. Different software tools, their basic parameters, development and usage are described. There are also explained terms like geographic information system, etc. The practical part is focused on the instruments used in selected countries, including Czech Republic, Slovak Republic, Hungary, USA, Canada and the United Kingdom. In the conclusion is the comparison of the effectiveness of software tools in emergency management and in environmental protection.
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Significance of emergencies modelling using specialized programmes
Ruhásová, Aranka ; Mika, Otakar Jiří (referee) ; Fazekas, Monika (advisor)
The Master's Thesis deals with the usage of various software tools in emergency management and in environmental protection. Nowadays, on every step we make, we can face emergency situations which can cause great harm to the environment as well as to human life and property. The theoretical part provides an overview of software tools. Different software tools, their basic parameters, development and usage are described. There are also explained terms like geographic information system, etc. The practical part is focused on the instruments used in selected countries, including Czech Republic, Slovak Republic, Hungary, USA, Canada and the United Kingdom. In the conclusion is the comparison of the effectiveness of software tools in emergency management and in environmental protection.
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