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Lagrange multipliers in linear elastostatics
Ondášová, Annamária ; Květoň, Josef (referee) ; Eliáš, Jan (advisor)
The thesis deals with the use of Lagrange multipliers, explaining the principle of their use and the calculating process. Lagrange multipliers are introduced into joints of a given truss structure. The calculation is conducted using minimalization of the potential energy and the principle of virtual work. Results are verified by direct elimination of the variables.
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Methods for topology optimization of mechanically loaded structures and their application on trusses
Pánek, Ondřej ; Lošák, Petr (referee) ; Ševeček, Oldřich (advisor)
This bachelor thesis deals with a topology optimization of truss structures. In the first part of this thesis an overview of individual methods of the structural optimization and brief description of their principle based on recherche of available literature is given. The second part of the thesis deals with an application of selected methods to the topology optimization of truss structures, employing the computational codes programmed in the MATLAB software. In the first step, a code for computation of stresses in individual trusses and displacements in nodes of the truss structure by the finite element method was programmed. This code was later used in individual topology optimization codes for computation of parameters mentioned above. Selected topology optimization methods and their computational codes were then used for optimization of two model tasks – bridge and cantilever beam subjected to isolated forces, in order to reduce their weight while maintaining safety to the limit states of elasticity and buckling stability. At the end of the thesis, gained results were compared to results available in literature (nevertheless optimized as a continuum structure) and it can be concluded, that both these results are in a very good agreement.
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The Roof Structure of a Multipurpose Sport Building
Málek, Leoš ; Straka, Bohumil (referee) ; Buchta, Stanislav (advisor)
This thesis deals with design of roof structure of multipurpose sports hall located in the city of Blansko. The goal is to use timber and natural resources as much as possible. Emphasis is placed on the maximal prefabrication at the site of production and the speed of assembly at the site of construction. Span of the structure is 40,035 m, length 59,75 m and height 17,525 m. The structure is designed as a three-hinged truss made from the glue laminated timber. The structural model was created by software RFEM of the Dlubal company.
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Design of a steel railway bridge with lower deck over the D35 motorway
Žáček, Libor ; Marván, David (referee) ; Nečesal, Petr (advisor)
The aim of the thesis is the design and assessment of a steel bridge over the D35 motorway in the section Opatovec – Staré Město, on the existing railway line section 017 Česká Třebová – Dzbel. It is a single-track bridge with one span (simple beam). The bridge is designed as a main beam of welded I profile, reinforced with a truss structure (Prostas beam). The bridge deck is designed orthotropic, consisting of bridge deck plate, longitudinal and transverse reinforcements. The structure is designed with S355 steel. The theoretical span of the bridge is 37.1 m. The total length of the steel structure is 38.02 m. The transverse distance between the main girders is 5.8 m. The clear width on the bridge is 5.3 m. The height of the main girder in the middle of the span is 5.0 m. The structure is supported on four pot bearings placed on the abutments To assess the structure and determine the internal forces, a model of the structure was created in Dlubal RFEM 5.31. The bridge plate, transverse bracing and longitudinal bracing are modelled as plate elements.
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Footbridge in Blansko
Urbánek, Jan ; Štrba, Michal (referee) ; Barnat, Jan (advisor)
The subject of the thesis is design and check of steel load-bearing structure of a footbridge. The footbridge spans the river Svitava in the town Blansko. The span length is 24 metres. The structural design is spatial bar structure with two main trusses. The upper and lower chords are curved in the shape of circular arch and they are connected by diagonal bars. In the level of the upper and lower chords the beams are connected by floor beam. Horizontal rigidity of the upper and lower construction area is secured by bracings. The bridge deck is laid on the lower floor beam. The solution is the result of the comparison and evaluation of two variants.
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Rail bridge over river Váh between Nemšová and Trenčianska Teplá
Lezová, Lívia ; Horáček, Martin (referee) ; Pešek, Ondřej (advisor)
The diploma thesis is focused on the design of a new steel structure of a single-track railway bridge with bottom bridge deck. The solved bridge construction is located on line No. 123 between Nemšová and Trenčianska Teplá at the point, where the line crosses over the river Váh. The existing bridge on the line has a span of 50 + 50 + 50 + 50 m. The assignment was processed in five variants of a steel bridge structure with a bottom orthotropic deck. Each variant has a different static system, a different number of fields and a different type of superstructure. The comparison of variants was performed using multicriterial evaluation based on selected criteria. The most suitable variant was elaborated in more detail. The calculations were performed according to valid ČSN EN standards.
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Road and tram bridge
Vošček, Martin ; Štrba, Michal (referee) ; Brosch, Petr (advisor)
The subject of this Diploma Thesis is to develop different alternatives of the road and tram bridge. It is a river bridge with the length of 52,5 m. There are compared two proposals, while in the first proposal it is an arch bridge with the tension bars. The second proposal which is also finalized as the winning proposal is the truss structure. Both proposals have composite deck. The structure is designed from steel S355 and concrete C35/45. The load bearing structure is designed in accordance with applicable technical standards.
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Stress and deformation analysis of railway bridge over the Odra River
Svoboda, Josef ; Profant, Tomáš (referee) ; Fuis, Vladimír (advisor)
This bachelor thesis deals with strain, stress and deformation analysis of the planar truss bridge construction. The aim is to determined the size of axial forces for statically determinate system and then making construction changes to reduce axial stresses in the individual beams in the structure. This structural modification becomes statically indeterminate structure. To solve this problem we consider different positions of the train at the bridge. The obtained values we can use to assess stress and deformation of the structure and the analytical results will be compared with the results obtained using the finite element method.
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Load-carrying steel structure of railway bridge
Ganglbauer, Tereza ; Melcher, Jindřich (referee) ; Karmazínová, Marcela (advisor)
The master thesis focuses on the design of a Load-carrying steel structure of railway bridge with bottom steel deck of the span of 28 + 45 + 23 m. The bridge is situated in the municipality of Třebestovice. Four variants of solution have been calculated. Two variants are made by plate main beams of variable profile, the next alternative was made by truss structure and the fourth variant consist of a combination of plate main beams with truss stiffener in the middle span. The most optimal solution was processed in detail. The calculations were done in compliance with valid ČSN EN norms.
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