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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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Strength analysis and optimization of the two-way excavator MH Plus S cab
Zavadil, Milan ; Janich, Miroslav (referee) ; Pokorný, Přemysl (advisor)
This diploma thesis deals with stress analysis and optimization of two-way cab excavator MH Plus S with total weight of machine 19375 kg. Stress analysis has been performed using the finite element method (FEM). As next step the structure design of protective frame and strength analysis of the cab and protective frame, which protect crew when the machine is rolled over protective structure (ROPS) according to ČSN EN ISO 3471 standard, have been made. The design documentation is a part of diploma thesis. This diploma thesis was conducted in cooperation with the firm Agrotec a.s.
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Overhead travelling crane 125t
Peprník, Pavel ; Zimola, Lubomír (referee) ; Pokorný, Přemysl (advisor)
This diploma thesis deals with the assessment of drafted steel construction of overhead travelling crane by using finite element method. The crane’s lifting capacity is 125t/32t. It is going to be placed in hall of Slovácké strojírny, a. s. in Uherský Brod. Span of the crane is 25.8 meters, wheelbase is 6.7 meters and lifting height is 17 meters. My work contains analysis and assessment of crane construction with a load of fatigue according to ČSN 27 0103.
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Church in the city
Strnad, Miroslav ; Mikulášek, David (referee) ; Štěpán, Marek (advisor)
The design of the Church “Seslání Ducha Svatého” with the spiritual center in Líšeň, Brno answers the question: "How should the contemporary church look like?" Analysis of the site, awareness of the character and requirements of today's time, historical and cultural continuity and liturgical changes of the last century gave rise to 7 points of the architecture of the new church. This program describes the new liturgy, defines the form of the subordinate community of believers, characterizes the work with the material envelope of the inner space, establishes the relation between the horizontal and the vertical and the curved and rectangular, explains the theme of orientation and work with the interior. The final urban and architectural solution is based on these assumptions. The spiritual center, consisting of a multifunctional hall, a classroom, a club-room, a rectory, a cafeteria with a library, and underground garages with technology, is geometrically rigid, layered and precisely fitted, while church is completely different in its shape and scale, indicating functional and sacral differences. The abstract form of the church refers to the inviolability of God. The interior of the Church is a place of silence, a pure and noble space, formed by higher order principles. Another important way of expression becomes light as the creator of the spiritual space. An important part of the proposal is also the principle of organizing a church with a spiritual center around the inner square opened to the south by a wide entrance staircase.
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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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Church in the city
Strnad, Miroslav ; Mikulášek, David (referee) ; Štěpán, Marek (advisor)
The design of the Church “Seslání Ducha Svatého” with the spiritual center in Líšeň, Brno answers the question: "How should the contemporary church look like?" Analysis of the site, awareness of the character and requirements of today's time, historical and cultural continuity and liturgical changes of the last century gave rise to 7 points of the architecture of the new church. This program describes the new liturgy, defines the form of the subordinate community of believers, characterizes the work with the material envelope of the inner space, establishes the relation between the horizontal and the vertical and the curved and rectangular, explains the theme of orientation and work with the interior. The final urban and architectural solution is based on these assumptions. The spiritual center, consisting of a multifunctional hall, a classroom, a club-room, a rectory, a cafeteria with a library, and underground garages with technology, is geometrically rigid, layered and precisely fitted, while church is completely different in its shape and scale, indicating functional and sacral differences. The abstract form of the church refers to the inviolability of God. The interior of the Church is a place of silence, a pure and noble space, formed by higher order principles. Another important way of expression becomes light as the creator of the spiritual space. An important part of the proposal is also the principle of organizing a church with a spiritual center around the inner square opened to the south by a wide entrance staircase.
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Strength analysis and optimization of the two-way excavator MH Plus S cab
Zavadil, Milan ; Janich, Miroslav (referee) ; Pokorný, Přemysl (advisor)
This diploma thesis deals with stress analysis and optimization of two-way cab excavator MH Plus S with total weight of machine 19375 kg. Stress analysis has been performed using the finite element method (FEM). As next step the structure design of protective frame and strength analysis of the cab and protective frame, which protect crew when the machine is rolled over protective structure (ROPS) according to ČSN EN ISO 3471 standard, have been made. The design documentation is a part of diploma thesis. This diploma thesis was conducted in cooperation with the firm Agrotec a.s.
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Overhead travelling crane 125t
Peprník, Pavel ; Zimola, Lubomír (referee) ; Pokorný, Přemysl (advisor)
This diploma thesis deals with the assessment of drafted steel construction of overhead travelling crane by using finite element method. The crane’s lifting capacity is 125t/32t. It is going to be placed in hall of Slovácké strojírny, a. s. in Uherský Brod. Span of the crane is 25.8 meters, wheelbase is 6.7 meters and lifting height is 17 meters. My work contains analysis and assessment of crane construction with a load of fatigue according to ČSN 27 0103.
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