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Design and analysis of precast dapped-end beams
Hasa, Michal ; Navrátil,, Jaroslav (referee) ; Vítek,, Jan (referee) ; Zich, Miloš (advisor)
The doctoral thesis deals with the analysis of the dapped-end beam detail, in terms of theoretical modelling and practical design using the strut-and-tie method as well as experimental verification of the bearing capacity and the behaviour of the detail under load by means of load tests and subsequent numerical nonlinear analysis. A summary of known structural and static designs explored in the literature has been presented. In addition, the strut-and-tie method has been introduced as an appropriate tool for a consistent design of the detail, element or the whole structure. The theoretical basis for the method has been described, including the general methodology for design and analysis. Practical problems have been discussed, specifically those resulting from the known design of the analysed detail based on the German approach; its modification has been processed theoretically taking into account the practical mode of reinforcement. An experiment has been suggested with a view to verify the presented calculation procedure and the influence of the used ratio of vertical to inclined hanger reinforcement on the bearing capacity and behaviour of the detail under load. The experiment also included accompanying material tests of the concrete which were used along with the inspection certificates issued for the used reinforcement as a basis for the nonlinear finite element analysis. Based on the results, the presented design procedure can be considered safe. These results also imply that the chosen ratio of vertical and inclined hanger reinforcements has no influence on the ultimate bearing capacity within practical reinforcement, as it only influences the formation, development and final width of cracks. With the growing ratio of the inclined hanger reinforcement, the width and density of cracks decreases at all stages of loading. Owing to their limitations, primarily during the service state, it is recommended that the minimal inclined reinforcement should be used.
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Strenghtening of the load bearing parts of the production hall
Čížová, Kateřina ; Pinkas, Karel (referee) ; Klusáček, Ladislav (advisor)
The diploma thesis deals with the strenghtening of the supporting parts of the production hall in Drásov. In the first part the existing load bearing capacity of the structure is solved. The next step is to design of strenghtening variants for nonconforming columns and short corbel. Columns and short corbel are strenghtening with monostrand. At the end of the thesis, verification of the load bearing capacity of the strenghtening structure is performed.
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Design of the engineering structure
Svoboda, Adam ; Volf, Marek (referee) ; Klusáček, Ladislav (advisor)
The bachelor thesis deals with design issues of industrial buildings and is focused especially on design and assessment of short corbels. The first part of the thesis consists of a translation of technical text published by prof. J. Schlaich (E DIN 1045-1). In the second part of the thesis is the gained knowledge applied on assessment of existing industrial structure SUAS a.s. in Vřesová. For the analysis of short corbels is used the strut-and-tie model and the method of limitation of concrete compressive stress at the nodes of the strut-and-tie model. The thesis concludes with structural strengthening of nonconforming short corbels by using prestressed cables to ensure safe operation of the crane runway.
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Design and analysis of precast dapped-end beams
Hasa, Michal ; Navrátil,, Jaroslav (referee) ; Vítek,, Jan (referee) ; Zich, Miloš (advisor)
The doctoral thesis deals with the analysis of the dapped-end beam detail, in terms of theoretical modelling and practical design using the strut-and-tie method as well as experimental verification of the bearing capacity and the behaviour of the detail under load by means of load tests and subsequent numerical nonlinear analysis. A summary of known structural and static designs explored in the literature has been presented. In addition, the strut-and-tie method has been introduced as an appropriate tool for a consistent design of the detail, element or the whole structure. The theoretical basis for the method has been described, including the general methodology for design and analysis. Practical problems have been discussed, specifically those resulting from the known design of the analysed detail based on the German approach; its modification has been processed theoretically taking into account the practical mode of reinforcement. An experiment has been suggested with a view to verify the presented calculation procedure and the influence of the used ratio of vertical to inclined hanger reinforcement on the bearing capacity and behaviour of the detail under load. The experiment also included accompanying material tests of the concrete which were used along with the inspection certificates issued for the used reinforcement as a basis for the nonlinear finite element analysis. Based on the results, the presented design procedure can be considered safe. These results also imply that the chosen ratio of vertical and inclined hanger reinforcements has no influence on the ultimate bearing capacity within practical reinforcement, as it only influences the formation, development and final width of cracks. With the growing ratio of the inclined hanger reinforcement, the width and density of cracks decreases at all stages of loading. Owing to their limitations, primarily during the service state, it is recommended that the minimal inclined reinforcement should be used.
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Strenghtening of the load bearing parts of the production hall
Čížová, Kateřina ; Pinkas, Karel (referee) ; Klusáček, Ladislav (advisor)
The diploma thesis deals with the strenghtening of the supporting parts of the production hall in Drásov. In the first part the existing load bearing capacity of the structure is solved. The next step is to design of strenghtening variants for nonconforming columns and short corbel. Columns and short corbel are strenghtening with monostrand. At the end of the thesis, verification of the load bearing capacity of the strenghtening structure is performed.
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Design of the engineering structure
Svoboda, Adam ; Volf, Marek (referee) ; Klusáček, Ladislav (advisor)
The bachelor thesis deals with design issues of industrial buildings and is focused especially on design and assessment of short corbels. The first part of the thesis consists of a translation of technical text published by prof. J. Schlaich (E DIN 1045-1). In the second part of the thesis is the gained knowledge applied on assessment of existing industrial structure SUAS a.s. in Vřesová. For the analysis of short corbels is used the strut-and-tie model and the method of limitation of concrete compressive stress at the nodes of the strut-and-tie model. The thesis concludes with structural strengthening of nonconforming short corbels by using prestressed cables to ensure safe operation of the crane runway.
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