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Design of a one-span slab bridge
Mareček, Tomáš ; Zvolánek, Lukáš (referee) ; Nečas, Radim (advisor)
This thesis deals with the design and solution of a slab bridge structure. This paper is divided into chapters in chronological order depending on the designe and solution. In first chapter are presented two options of bridge and one of them is selected to next counting. The next chapters contain describition of loading, changes in prestressing and internal forces. Final chapters are aimed to serviceability limit state and ultimate limit state.
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Bridge across the Lochkov Valley
Zvolánek, Lukáš ; Juchelková, Pavlína (referee) ; Stráský, Jiří (advisor)
The theme of the Master’s thesis is detailed design of superstructure for selected option of the bridge. The bridge carries highway across Lochkov valley. The superstructure, 6 spans, is made of one cell continuous box beam with large overhangs supported by prefabricated struts. The continuous beam is in plan curvature. As the first, side spans 1, 5, 6 will be casting on fixed scaffolding. Spans 2 and 4 will be casting using cantilever method, gradually hanging superstructure up. For the casting the main span will also be using cantilever method, gradually removing temporary hangers of adjacent spans. The structure was analysed according to limit states. The thesis also includes a time dependent analysis of the structure and solution of influence construction on its design.
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Slab bridge at Kájov Village
Pavlíček, Zdeněk ; Zvolánek, Lukáš (referee) ; Panáček, Josef (advisor)
Topic of this bachelors´s thesis is project of bridge on road II/166 near to Kájov village. Aim of the bridge is transportation across Chvalšinký potok. Three variants of possible solution were designed. In first and second solution were used prestressed slab structures. In third prefabricated prestressed beams. Selected variant was prestressed slab structure with rectangular cross-section. Thesis contains statical analysis, drawing documentation, text part and visualization of designed constuction.
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Experimental and numerical analysis of rheological processes during the concrete maturation.
Zvolánek, Lukáš ; Navrátil, Jaroslav (referee) ; Vítek,, Jan (referee) ; Terzijski, Ivailo (advisor)
This doctoral thesis deals with the volume changes of structural concrete caused by its shrinkage. Great importance is given to the evaluation of concrete resistance against shrinkage cracking, too. A lot of physical and numerical experiments were carried out before results and conclusion of observed phenomena was publicized. The amount of physical tests and utilization rate of the experiments can be enlarged and intensified due to the usage of materials made of micro-concrete. Consequently, the design of concrete mixtures with the ordinary size of aggregate particle reflected the large knowledge obtained by micro-concrete. In this work, the effect of different fibres and its different amount was also researched. Finally, the optimized fibre concrete mixture was designed. During the testing, the unique method referred to as “Complex experiment” was developed. Obtained data from the Complex experiment allows predicting when the shrinkage cracks may occur. The final comparison between all tested materials made of concrete was performed by means of unique parameter referred to as “Critical degree of restraint”. It was proofed that the resistance of optimized fibre concrete against to shrinkage cracking is twice of ordinary concrete. Moreover, the shrinkage cracks did not occur in the developed fibre concrete during the observed period. Based on the obtained results the new scaling factors for the rheological model B4 were derived. Due to the new scaling factors, the model B4 describes the real behavior of special composite materials very well.
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Experimental and numerical analysis of rheological processes during the concrete maturation.
Zvolánek, Lukáš ; Navrátil, Jaroslav (referee) ; Vítek,, Jan (referee) ; Terzijski, Ivailo (advisor)
This doctoral thesis deals with the volume changes of structural concrete caused by its shrinkage. Great importance is given to the evaluation of concrete resistance against shrinkage cracking, too. A lot of physical and numerical experiments were carried out before results and conclusion of observed phenomena was publicized. The amount of physical tests and utilization rate of the experiments can be enlarged and intensified due to the usage of materials made of micro-concrete. Consequently, the design of concrete mixtures with the ordinary size of aggregate particle reflected the large knowledge obtained by micro-concrete. In this work, the effect of different fibres and its different amount was also researched. Finally, the optimized fibre concrete mixture was designed. During the testing, the unique method referred to as “Complex experiment” was developed. Obtained data from the Complex experiment allows predicting when the shrinkage cracks may occur. The final comparison between all tested materials made of concrete was performed by means of unique parameter referred to as “Critical degree of restraint”. It was proofed that the resistance of optimized fibre concrete against to shrinkage cracking is twice of ordinary concrete. Moreover, the shrinkage cracks did not occur in the developed fibre concrete during the observed period. Based on the obtained results the new scaling factors for the rheological model B4 were derived. Due to the new scaling factors, the model B4 describes the real behavior of special composite materials very well.
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Bridge across the Lochkov Valley
Zvolánek, Lukáš ; Juchelková, Pavlína (referee) ; Stráský, Jiří (advisor)
The theme of the Master’s thesis is detailed design of superstructure for selected option of the bridge. The bridge carries highway across Lochkov valley. The superstructure, 6 spans, is made of one cell continuous box beam with large overhangs supported by prefabricated struts. The continuous beam is in plan curvature. As the first, side spans 1, 5, 6 will be casting on fixed scaffolding. Spans 2 and 4 will be casting using cantilever method, gradually hanging superstructure up. For the casting the main span will also be using cantilever method, gradually removing temporary hangers of adjacent spans. The structure was analysed according to limit states. The thesis also includes a time dependent analysis of the structure and solution of influence construction on its design.
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Slab bridge at Kájov Village
Pavlíček, Zdeněk ; Zvolánek, Lukáš (referee) ; Panáček, Josef (advisor)
Topic of this bachelors´s thesis is project of bridge on road II/166 near to Kájov village. Aim of the bridge is transportation across Chvalšinký potok. Three variants of possible solution were designed. In first and second solution were used prestressed slab structures. In third prefabricated prestressed beams. Selected variant was prestressed slab structure with rectangular cross-section. Thesis contains statical analysis, drawing documentation, text part and visualization of designed constuction.
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Design of a one-span slab bridge
Mareček, Tomáš ; Zvolánek, Lukáš (referee) ; Nečas, Radim (advisor)
This thesis deals with the design and solution of a slab bridge structure. This paper is divided into chapters in chronological order depending on the designe and solution. In first chapter are presented two options of bridge and one of them is selected to next counting. The next chapters contain describition of loading, changes in prestressing and internal forces. Final chapters are aimed to serviceability limit state and ultimate limit state.
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