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Comparison of strains determined by finite element method and by optical measurement system
Zajíček, Vít ; Hlavoň, Pavel (referee) ; Vlk, Miloš (advisor)
This thesis focuses on the comparison of numerical simulation and optical measurement of deformation of the turbinehousing made by Honeywell company. The numerical calculation performed by finite element method to simulate transient thermal load on the measured entity. Numerical result of the strain state of the body caused by temperature gradients. To verify the simulation is used an experimental digital correlation method VIC-3D. The thesis also mentioned the theoretical foundations of digital correlation methods and thermal analysis.
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Mixed construction of an office building
Fiala, Adam ; Zich, Miloš (referee) ; Perla, Jan (advisor)
Diploma thesis deals with analysis of a construction made of concrete and masonry. A model respecting nonlinear material behaviour of masonry was assembled in a finite element based software. Calculated results were used to analyse cracks in masonry. Next, a design of a horizontal construction was carried out - concrete slab with beams to support masonry in an upper floor.
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Determination of design resistance of reinforced concrete bridge
Šplíchal, Bohumil ; Doležel, Jiří (referee) ; Lehký, David (advisor)
This thesis deals with the topic of assessing the design load-bearing capacity of a reinforced concrete bridge structure. The determination of the load-bearing capacity of the structure is carried out by means of probabilistic nonlinear analysis using finite element method. Load-bearing capacity is determined for the recommended limit states. A fully probabilistic approach is compared to other recommended reliability methods, such as the ECoV method according to fib Model Code 2010, the partial safety factor method, or the method according to ČSN EN 1992–2. The results are evaluated in terms of accuracy and time-consuming for each method.
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Analysis of Strengthening Reinforced Concrete Slabs Against Punching Shear
Nováček, Jan ; Halvoník,, Jaroslav (referee) ; Vítek,, Jan (referee) ; Zich, Miloš (advisor)
The thesis deals with the topic of the punching shear of the reinforced concrete structures with a focus on an additional strengthening. The introduction of the thesis is devoted to the research of various types of strengthening against the punching and their efficiency on an increase of load-bearing capacity. Material nonlinear models are formed for strengthening by an additional concrete head, a slab concrete overlay and a column concrete jacketing. The results from the nonlinear analysis are compared with various standards, including the new generation of Eurocodes. Detailed analysis of an additional concrete head is performed regarding governing inputs, which influence load-bearing capacity. Theoretical assumptions were applied to the design of the additional concrete head, where long-term measurement has been performed for the comparison with the analytical assumptions and the material nonlinear model. The second part of the thesis deals with the strengthening of foundation structures, which are accessible only from one surface. There is presented newly developed technology for strengthening by the additional shear reinforcement with the combination of bonding and mechanical anchorage. The assessment of proposed technology is defined for the strengthening against punching shear based on tested samples. The detailed technological procedure is described, including the procedure for the application on the structures below ground water level. Long-term measurement of the shear reinforcement was carried out for the strengthened foundation slab.
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Study of influence of input parameters for the numerical modeling of the compression test
Polách, Marek ; Keršner, Zbyněk (referee) ; Lehký, David (advisor)
The thesis analyses influence of input parametres of the 3D Non Linear Cementitious 2 material model for the numerical modeling of compression test performed in ATENA 2D and ATENA 3D software. The aim is to identify parametres with considerable influence and subsequently replicate the load-deflection curve obtained from laboratory compression test by numerical modeling. The effects of selected model and material model settings are studied on three kind of models in total. As tools for analyzing the effects, deterministic and statistic sensitivity analyses were chosen. Parametres with significant influence will be highlighted and added to the group of parametres obtained from numerical modeling of three-point bending test. This will create a set of parametres of considerable influence when it comes to modeling advanced structures with different types of stresses.
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Nonlinear Response of Steel Structures on Statical Loading
Nezbedová, Anna ; Vlk, Zbyněk (referee) ; Kala, Zdeněk (advisor)
This paper deals with the nonlinear response of steel structures to static loads. There are formulas derived for nonlinear analysis compressed, bended and tension members. By compressed elements, there is described the issue of buckling, by the bended, it is lateral-torsional buckling and tension elements are cables. As an example there is an calculation of a suspension two spans pedestrian steel bridge under load action of asymetrical loads. As another possible calculation process, the finite elements method is described.
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Probabilistic analysis of reinforced concrete bridge made of I-73 girders
Nezval, Michal ; Šomodíková, Martina (referee) ; Lehký, David (advisor)
Many older bridges on the highways and roads in the Czech republic and all arend the world have been designed by codes, which are distinct of currently valid codes. Considering current codes, it is possible to set load bearing capacity in few different ways. In presented diploma thesis nonlinear finite element analysis using deterministic methods is compared with fully probabilistic nonlinear finite element analysis. Girder I-73 is analysed. Also the influence of degradation processes and following corrosion of reinforcement is taken into account, when load capacity is predicted for residual service life.
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The use of advanced composite materials for the design of concrete structures
Bártová, Denisa ; Matušíková, Anna (referee) ; Girgle, František (advisor)
This diploma thesis deals with the design of FRP reinforced concrete structures. The theoretical part is focused mainly on the punching shear of a flat two way slab according to ACI, fib Bulletin, CSA, and JSCE standards. This thesis also includes a description of the punching shear resistance according to Eurocode 2. FRP reinforcement, its mechanical properties, and their behaviour in time are also described. Next, a parametric study was performed that examines the effects of various parameters on the punching shear resistance according to the standards mentioned above. At the end a non-linear analysis using the ATENA software was performed. The practical part includes a structural design of a flat two way slab. The slab uses a steel reinforcement at the bottom, while the top is reinforced with FRP reinforcement. The punching shear design is also included. In the last chapter the serviceability limit state is checked, specifically the slab long-term deflection. The thesis also includes drawings. All calculations were performed in accordance with Eurocode 2 and fib Bulletin No. 40.
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