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Selected aspects of diagnostics of the reinforced concrete structure of the interwar period of the 20th century
Žítt, Petr ; Bílek,, Vlastimil (referee) ; Pěnčík, Jan (referee) ; Daněk, Petr (advisor)
The dissertation deals with diagnostics and load tests of a reinforced concrete ceiling structure built in the interwar period of the 20th century. The theoretical part of the work is an excerpt from standard regulations for the design of structures in terms of material properties of concrete and reinforcement, the implementation of load tests and measuring equipment used. Furthermore, static calculations according to relevant standards, numerical and stochastic analysis of selected members. The practical part of the work is then focused on performing experimental load tests of selected elements of the ceiling structure with appropriate diagnostic work, which includes determining the geometry of the supporting structure, reinforcement of elements and determining the quality of built-in materials. An integral part of the practical part of the work is based on the data obtained from the performed load tests and diagnostic work to perform a static assessment of the affected structures and to compile a deterministic and stochastic FEM model of the selected member. The conclusion is a comparison of measured data with FEM analyzes, analysis of the justification of the use a load tests in the context of classical diagnostic methods and the methodology of the optimal number of test samples for objective evaluation of the actual state of the structure.
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Preliminary survey of the historic reinforced concrete bridge
Ježíková, Pavlína ; Žítt, Petr (referee) ; Cikrle, Petr (advisor)
This bachelor thesis focuses on the preliminary survey of a bridge connecting the west and east wing of the Veveří castle. It is a structure of a very high significance because it is presumably the oldest preserved bridge made from reinforced concrete, it was completed in 1898. A visual inspection of the outside and inside parts of the bridge was performed. To examine the quality of used concrete and type reinforcement and finding out the condition of the structure, destructive and non-destructive diagnostic tests were used. Because of the historical significance of the bridge is part of the thesis devoted to the history of bridge construction and the author of the Veveří Bridge and the pioneer of reinforced concrete constructions in our country professor Josef Melan.
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Experimental and numerical analysis of reinforced concrete elements
Niedoba, Jakub ; Láník, Jaromír (referee) ; Žítt, Petr (advisor)
This master‘s thesis deals with the behaviour of strengthened reinforced concrete beams. The aim was to evaluate different types of strengthening in comparison not only with each other, but also with the reference beam. Three reinforced concrete beams were fabricated for the purpose of the thesis. The first served as a reference beam, the second was strengthened with carbon lamella glued to the lower edge of the reinforced concrete beam, and the last one was strengthened with unbonded post-tensioning system. Subsequently, they were all loaded by a four-point bending. An evaluation was then carried out which shows that the two strengthened reinforced concreate beams resist the load much better than the reference beam. In the conclusion, different utilization possibilities of both methods are listed, as well as the disadvantages that must be taken into account when designing.
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Diagnostics of bridge structure
Nápravník, Petr ; Žítt, Petr (referee) ; Láník, Jaromír (advisor)
This bachelor´s thesis deals with construction-technical survey of a highway bridge no. D1-243 across Ripska street at suburbs of Brno. Theoretical part contains bridge terminology, inspections, problematics of prefabricated beams I-73, construction-technical survey and description of laboratory tests. Practical part deals with making of a construction-technical survey, evaluation of construction parts and a summary of results.
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Diagnostics of the Bridge Structure
Kněbort, David ; Žítt, Petr (referee) ; Kocáb, Dalibor (advisor)
The bachelor’s thesis deals with the diagnostics of single-span railway bridge over road I/55H at ekm 137,608 (TÚ 2401). The theoretical part of the bachelor’s thesis consists of research applicable standards and technical literature, information on bridge inspection and diagnostics methods suitable for the type of structure. The practical part is focused on the bridge inspection, diagnostics of the construction and evaluation of its results. Based on the results, applicable measures are designed to correct defects and failures of structure.
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Diagnostics of selected bridge structure
Jedlička, Lukáš ; Láník, Jaromír (referee) ; Žítt, Petr (advisor)
This thesis deals with building survey of bridge register number 43-011 located near Česká. The part of thesis is literary reaserch dealing with system of management and cotrol of road bridges, precast bridge contructions made with DS-C type girgers and about general diagnostical methods. The practical section contains of in situ diagnostical survey and bridge inspection, laboratory evaluation and comparision, load bearing capacity calculation and suggestion of potencional technical precautions.
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The Influence of different Types of Fiber-reinforcement on the Behavior of Concrete Slabs
Wünsche, Dominik ; Žítt, Petr (referee) ; Kocáb, Dalibor (advisor)
The bachelor‘s thesis deals with the issue of concrete, specifically self-compacting concrete, fiber concrete and other types of concrete used. The work consists of two parts, the theoretical one, which will deal with the properties of the concrete. It describes the individual test methods used in the practical part. The test methods are the ultrasonic pulse method, the resonance method, the static modulus of elasticity, the compressive strength, and especially flexural strength. The second part is a practical part, which is processed by an experiment. In the experimental part, it will be mainly about carrying out tests of self-compacting concrete slabs and concrete with the addition of steel fibers. Subsequently, selected characteristics of concrete are determined and the whole experiment is evaluated.
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Diagnosis selected bridge structure
Novák, Jakub ; Láník, Jaromír (referee) ; Žítt, Petr (advisor)
The Diploma thesis deals with the Diagnostics of Reinforced Concrete Bridge in the village of Luhačovice. This thesis also describes the individual Diagnostic methods and instruments used in purpose to make Diagnosis of bridge constructions. The main aim of the Diagnostics is to determine the current state of the Bridge which consists in verification of the actual road structure, determination of the physical and mechanical parameters of the Concrete (strength, depth of carbonation) and in some parts of the bridge structure to determine the type, number and position of the bending or shear reinforcement. Based on the evaluation of the laboratory tests a static calculation of the selected part of the Bridge structure is performed. The final evaluation is the determination of the load and the subsequent design of the necessary and recommended measures for maintaining or improving the functionality of the bridge structure.
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