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Form finding of shell structures
Musil, Jiří ; Bažant, Zdeněk (referee) ; Vítek,, Jan (referee) ; Stráský, Jiří (advisor)
The theme of this doctoral thesis is the design of concrete shell structures with the focus on finding their optimal shape. The optimal shape of a concrete shell is the shape in which for a given load (usually the dead weight of the structure) no significant bending moments are generated in the shell and the structure is in the so-called membrane state. The inspiration for this thesis is the work of Swiss engineer Heinz Isler, who developed the shapes of shell structures using model tests of appropriately loaded flexible membranes. He developed the shell structure for large spans by inverting the resultant shape, which carried its weight almost entirely via membrane forces. The numerical solution of the above experiments using Midas Civil is presented herein. The basic principles of the method are demonstrated on the example of sagged cable. The numerically found shapes are compared with the analytical solution. A shell is designed based on the numerically found shapes and its stress response to dead load is described, particularly in relation to the membrane action. In the next part, the acquired knowledge and methods were used to design three relatively complicated shell structures. Each structure was statically analysed and its static behaviour was described. Structures with perfectly rigid or flexible supports, which simulate real behaviour of the supports, were studied. In the final phase, the results of static analysis of the selected shell were experimentally verified on a physical model in a scale of 1: 55.56. The model has been built using 3D printing. The thesis describes the use of a modelling similarity, the model design, the production process, and the experiment. The load test confirmed the optimal design of the shell structure and the validity of the numerical method for finding their shapes.
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Reconstruction of barn as a part of Miroslavské Knínice castle
Martínek, David ; Bažant, Zdeněk (referee) ; Strnad, Jiří (advisor)
The bachelor thesis deals with the reconstruction of a barn in Miroslavské Knínice. First, it was necessary to examine the conditions of the barn. Crumbling masonry and cracks in perimeter walls had been found, so it was necessary to create a design and assess new solutions to repair the barn. On the basis of these defects, it was proposed to pull down a half of the barn, including the foundations and proposed to lay concrete over this part of formwork together with reinforcement.
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Reinforced concrete structure of the railway platform roofing
Vodová, Pavla ; Bažant, Zdeněk (referee) ; Šulák, Pavel (advisor)
The bachelor‘s thesis deals with assessment of existing damaged reinforced concrete strucutre of the railway platform roofing according to the original project documentation. Apart from assessment of existing structure, there is prepared a design of two alternative solutions. The first alternative is a remediation of damage structure with description of appropriate diagnostic methods for testing concrete structures and with description of technological process of implementation of remediation. The second alternative is design of completely new structure instead of existing one. This new structure is designed as a monolithic frame contruction with restraint reinforced concrete panel and one – step foundation block. In this bachelor’s thesis there were prepared a design and assessment of sub – sections and work – out appropriate drawing documentation. All static assessments are calculated according to ultimate limit state.
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Monolithic concrete building at sewerage plant
Klimeš, Petr ; Bažant, Zdeněk (referee) ; Strnad, Jiří (advisor)
Bachelor's thesis deals with design of monolithic concrete construction with a timber roof truss for a device of sewerage plant. This construction consists of these elements- strip foundation, walls with lintels, slab and timber trusses. This thesis contains static analysis of the component parts and their drawing documentation.
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Analysis of behaviour of reinforced concrete slab
Kubínek, Michal ; Bažant, Zdeněk (referee) ; Zich, Miloš (advisor)
Bachelor thesis describes the analysis of behavior of existing reinforced concrete slab, locally supprorted, ceiling in hospital including 2nd limit state. Calculation od internal forces was made by computer program SCIA Engineer. Several models were made, model with best behavior due to real construction was used for dimensioning. Each model was compared with manual calculation by equivalent frame analysis. After finding inconvenient deflection, especially due to connected construction, new design was made. Thickness of slab was increased and new design of reinforcement was made. New construction was verified for both limit states.
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Static analysis of reinforced concrete floor structure of historical building
Nani, Pavel ; Bažant, Zdeněk (referee) ; Zich, Miloš (advisor)
The chief objective of my bachelor’s thesis is a design of the reinforced concrete floor structure of a historical building over 1st floor. The historical building was built in 1874. There are three floors in this building and there isn’t any underground floor. The reinforced concrete floor structure consists of the following forms of structure – a ribbed ceiling, a floor slab, a beam, a shell of vault and a staircase. The ribbed ceiling is made from a lost formwork of the VELOX firm. The set reinforced concrete floor structures are according to ČSN EN 1992-1-1.
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Eliminate structural thermal brigdes
Tůma, Pavel ; Bažant, Zdeněk (referee) ; Perla, Jan (advisor)
The Bachelor thesis deals with the ways of eliminating thermal bridges in overhanging concrete structures using ISO-beams. The first part of the thesis presents a list of producers who provide ISO-beams in the Czech Republic, a comparison of products according to the transfer of internal forces, and the complete product list of ISO-beams by Schöck GmbH. The second part deals with the calculation of internal forces of particular balconies and design reinforcement.
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Monolithic multi-storey wall building
Vymazal, Jakub ; Šulák, Pavel (referee) ; Bažant, Zdeněk (advisor)
Final thesis with tittle: "Monolithic multi-storey wall building" is processeed as a project documentation according to valid assesment. The object is located in the city of Boskovice, 35 Hybešova street. Its ground plan dimensions are 52,8m x 12,5m. Total height of object is 22,3m including roof-wall, measured from the level of base chink. There are enclosed balconies on the south direction. Movement between floors is ensured by 2-flighted stairs. Object is It is made of reinforced concrete. It is designed as 6-floor bulding with a flat roof. The main supporting construction is created by system of walls and reciprocally asigned ceilings, which are sticked together. Walls are designed as pillars. The building is assigned to a belt bases. Module dimensions are 8,7m in longitudinal direction and 5,2m in transversal direction. Height dimension is 3,0m. The thesis is dealing with the 1st upper floor.
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