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The Usage of the dynamic cone penetrometer to road buildings
Antošová, Klára ; Hýzl,, Petr (referee) ; Stehlík, Dušan (advisor)
The work is devoted to the topic of dynamic cone penetrometer use in road construction. The first part deals with the description of the measuring device of dynamic cone penetrometer and using it in controlling compaction of embankments of roads. Furthermore, comparing the correlation relationships with other commonly used tests. The practical part deals with comparing the results of CBR and DCP on the same materials and evaluation of both tests.
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The verification of the time development of the concrete elastic modulus and the compressive strength
Alexa, Martin ; Cikrle, Petr (referee) ; Kocáb, Dalibor (advisor)
Especially in the early days of curing concrete for structures sensitive on deformation. Same like bridges of prestressed concrete a substantial knowledge of the exact value of the modulus of elasticity that could prevent excessive deformation. In this work we validates the development of concrete modulus of elasticity (in the first 28 days), which is used for the construction of bridges on the highway D1 near Ružomberok. To understand this issue was made a literature review and conducted experiment, which follows the time development of the concrete compressive strength and modulus of elasticity of concrete. Except the determination of modulus of elasticity in the experiment was investigated a dynamic moduli by an ultrasonic pulse method and the resonance method and the experiment was also performed by rebound hammer. The results can serve to verify the development of the modulus of elasticity on the actual structure.
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Analysis of the procedure for design of trackbed
Svobodová, Nikola ; Břešťovský,, Petr (referee) ; Plášek, Otto (advisor)
The diploma thesis focuses on analysing the current Railway Infrastructure Administration methodology for designing the sleeper substructure concerning the construction's deformation resistance, its comparison with the multi-layered method, which is used in the road engineering and finite element method. It deals with various methodologies of determining the deformation resistance of the track substructure.
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Verification of interaction between the foundation plate and the pile
Kozáková, Marcela ; Hrubešová,, Eva (referee) ; Turček,, Peter (referee) ; Horák, Vladislav (advisor)
The doctoral thesis deal with the interaction between the foundation plate and deep foundation in the form of bored piles in the case of skeleton construction. The issue of tension redistribution from the column between the plate and the pile is investigated on specific object – „Shopping and entertainment center Fórum Nová Karolina”. On this object were selected columns monitored and load tests of the piles was executed. Values of the axial loading of the piles and the actual deformation of the construction have been derived from measurements and tests. They were compared with the results of structural behavior by numerical modeling.
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THE USE OF ELETRONIC MEASURING SYSTEMS FOR MONITORING STRUCTURES
Kovács, Pavel ; Zich, Miloš (referee) ; Doc.Ing. Karel Kubečka, Ph.D (referee) ; Daněk, Petr (advisor)
This thesis deals with the use of the electronic measuring systems for monitoring structures. The first part of this work is focused on mapping the available measuring systems for monitoring deformations and strains, from the point of their measurement accuracy, the real advantages and disadvantages, including examples of monitoring of constructions. In the second part were selected measuring systems for monitoring strains and deflection interest structure. Subsequently, the measuring system with online recording into the tested roof structure was installed and the loading test was performed. Obtained data were compared with other two independent measurements. In the last part of the thesis, the measured values of each independent measurements were compared together, and with the values calculated from the mathematical model. The achieved results show that the installed monitoring system is capable to reliably measure deformation of the structure in real time and thus to warn the building administrator against the potential danger in advance.
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Evaluation of loading test of jet-grouted piles
Čechová, Simona ; Račanský, Václav (referee) ; Chalmovský, Juraj (advisor)
The master thesis consists of a theoretical part and a practical part. In the theoretical part jet-grouting technology is described briefly. Mechanical properties of jet-grouted piles were characterized. Various estimation methods of ultimate pile bearing capacity are described in this thesis – analytical calculation of ultimate bearing capacity for bored piles and estimation of ultimate pile bearing capacity by analysis of load-displacement curve defined by CHIN (1970; 1972). Load transfer method for piles and hyperbolic load-transfer curve are introduced. As a part of the load-trasfer method analysis, a method of estimating ultimate pile shaft friction called beta method is defined. In the practical part were evaluated several static load tests of jet-grouted piles and were constructed their load-displacemnt curves. Then reverse analysis of the results from static load tests was performed using load-transfer method. Then ultimate pile bearing capacity was estimated using analytical calculation of pile bearing capacity for bored piles and using analysis of load-displacement curve with method by CHIN (1970; 1972). By evaluation of load transfer method and beta method ultimate shaft resistence for each pile was estimated. Results and load-displacement curves were compared.
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Modulus of elasticity of natural stone
Hoduláková, Michaela ; Cikrle, Petr (referee) ; Kocáb, Dalibor (advisor)
The value of the modulus of elasticity of concrete depends on the concrete composition (particularly on the aggregate used). The contemporary construction industry literature lacks comprehensive studies of the modulus of elasticity for each type of the rock stone. Therefore, this study focuses on testing and comparing the modulus of elasticity of selected types of rock stones used for the production of crushed coarse aggregates into the concrete. The modulus of elasticity are determined by static and dynamic methods. The work also deals with the modulus of elasticity of granite in different stages of weathering.
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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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Methods used in diagnosis of masonry structures
Vrtal, Roman ; Láník, Jaromír (referee) ; Žítt, Petr (advisor)
The thesis is focused on testing methods used in diagnosis of masonry structures. It describes their implementation and evaluation, as well the tools needed for their realization and also their advantages and disadvantages. The aim of the thesis is to compare most commonly used testing methods and to describe their application in practical example of static load test of brick pillar.
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