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Evaluation failures of masonry buildings
Kopecký, Martin ; Stehlík, Michal (referee) ; Cikrle, Petr (advisor)
This bachelor’s thesis deals with an evaluation of defects of masonry buildings. The theoretical part gives a sorting of defects of masonry buildings according to various criteria including types of cracks, defects of brick walls and columns and systems of cracks in masonry buildings with their causes. The pictures with examples of the defects are enclosed. The practical part gives the documentation of a typical failure. This documentation is about uneven subsiding of two different parts of the church of St. James in Brno. The experimental part describes the failure in building „C“ which is the part of the area of Masaryk university, Faculty of Arts. This experimental part is based on the measuring of the deformations. The results of the measuring and photos are included.
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Detection of Failures and cavities in structures using radar
Tkadleček, Petr ; Anton, Ondřej (referee) ; Cikrle, Petr (advisor)
The bachelor‘s thesis describes non-destructive testing and methods, which are used in civil engineering. It is focused on the detection of failures and cavities in concrete structures. In the first part the methods are described and compared. The second part describes experimental measurements on concrete structures, which contain failures. The results are described and interpreted. The used methods are compared. It was evaluated, which of these methods is suitable for the detection of failures and cavities in structures.
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Diagnostics methodology of historical brickwork
Bakešová, Martina ; Cikrle, Petr (referee) ; Anton, Ondřej (advisor)
The aim of my bachelor’s thesis is to carry out historical overview of progress of masonry building elements and structures, including their thorough methodology of diagnostics. The introduction text is considering historical progress of masonry elements in Czech Republic and abroad. As following are described brick manufacturing methods of present and past, which is closely related to the progress of brick dimensions and its visual appearance. On sample specimen can be observed mentioned progress in the visual appearance, mechanical properties and so on. The diagnostics of masonry structures is realised via particular tests described in the thesis. Important tests used for overall evaluation are determining brick dimensions, it is volume density, absorption, compressive strength determined via destructive and non destructive methods. Also flexural tensile strength and compressive strength of the mortar. Output of my thesis is overall evaluation of all parts mentioned above.
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Methods for the survey reinforced concrete bridges
Ehrenberger, Ondřej ; Anton, Ondřej (referee) ; Cikrle, Petr (advisor)
Policies and types of diagnostic examination of a bridge. The theoretical section contains review diagnostic methods for a steel concrete frameworks. In a practical section there is made a examination of a bridge object over a river Moravia and a suggestion of the examination according to the detected defects. In the experimental section we are discovering, with a help of georadar, a location of reinforcement of a monolithic wall and board.
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Properties, Testing and use of UHPC in Structures
Myšičková, Lucie ; Kocáb, Dalibor (referee) ; Cikrle, Petr (advisor)
Thesis describes properties and composition of UHPC compared to concretes of normal and high strength. It gives examples of already completed structures made of UHPC. The experimental part describes the optimization of concrete mix and production of specimens. In the end results of testing the properties of the developed mix from tests of dynamic and static modulus of elasticity, compressive strength and tensile strength by bending are described.
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The survey and assessment of stone construction
Šarounová, Pavla ; Bažant,, Zdeněk (referee) ; Cikrle, Petr (advisor)
This thesis is focused on applying the process of the assessment of existing structures from ČSN ISO 13822 on the evaluation of stone constructions. These are seen here as masonry structures, but with some specifics. Since the source of this specifics results from the natural origin of the building material and significant age of preserved stone structures, to its evaluation also the knowledge of geology and history of architecture is necessary. For this reason, this thesis contains also the geological overview of rocks used for building and describes characteristics of stone structures from different architectural periods. The aim of the practical part is to describe preliminary investigation of an existing stone construction on the example of the stone bridge in Dobromilice.
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The use of ultrasonic methods in the diagnosis of concrete structures
Stanislav, Štěpán ; Anton,, Ondřej (referee) ; Cikrle, Petr (advisor)
This Bachelor’s thesis is focused on presenting of a listing of testing procedures of concrete structures by means of an ultrasonic diagnostic method. It deals with the principles of the aforementioned method, possibilities of its use and with the procedures of testing pursuant to a various regulations. The purpose of the practical part of the thesis work, in which was undertaken the process of measurement on the model of concrete structure is to determine certain material characteristics of the concrete as well as the comparison of the direct, indirect and semi-direct transmission.
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Influence of Initial Conditions on the Modulus of Elasticity of Concrete for Bridges
Blažek, Michal ; Bílek,, Vlastimil (referee) ; Cikrle, Petr (advisor)
Beside the compressive strength of concrete, which is considered as the basic parameter parameter for design of concrete structures a modulus of the concrete elasticity should be set as well. This thesis deals with influences, which are acting on the concrete, particularly within the initial stage of its hardening (i.e. within 28 days after casting). Nowadays, when time is the most valuable factor, some knowledge is required about mechanical properties of concrete earlier than after above mentioned 28 days and to apply them advantageously. The concrete in initial stage of hardening is influenced by many factors that affect progress of the elasticity modulus during the course of the time. For understanding of these problems a literature search was performed, as well as the experiment demonstrating the effect of temperature on the modulus of the concrete elasticity. The effect of temperature on the modulus of elasticity of concrete in initial stage of hardening has not been intensively studied yet. Therefore, more attention is paid to it by this elaborate. The experiment investigated the static and dynamic elastic modulus of concrete, whose recipe is similar to one used for production of prefabricated and prestressed bridge girders.
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Hardness testing of concrete in construction - new devices and procedures
Mikulec, Jan ; Pospíchal, Ondřej (referee) ; Cikrle, Petr (advisor)
In this bachelor thesis is carried out a research of non-destructive hardness methods. There are presented different instruments for measuring hardness and their destination for materials. There are also described and compared two possible approaches to processing of measured values and their evaluation. It deals with news in detail of hardness testers and work with them. These knowledge are applied to measure the hardness of concrete components using an instrument OriginalSchmidt type N and SilverSchmidt PC type N and data processing according to the two approaches and their comparison with the reasults of the cores.
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