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Železobetonová skeletová konstrukce
Pevner, Jan ; Strnad,, Jiří (oponent) ; Šulák, Pavel (vedoucí práce)
Bakalářská práce se zabývá návrhem monolitické železobetonové lokálně podepřené stropní konstrukce a schodištěm nad 2.NP v administrativním objektu, vypracování návrhu a výkresů výztuže na ohyb a smyk. Výpočet vnitřních sil je proveden ve výpočtovém programu SCIA Engineer s ručním ověřením pomocí zjednodušené metody.
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Lyžařský areál Červená Voda - hrubá spodní stavba
Vasserbauer, Jiří ; Rychtecký, Martin (oponent) ; Biely, Boris (vedoucí práce)
Předmětem bakalářské práce je řešení stavebně technologické přípravy novostavby Lyžařského areálu v Červené Vodě. Tato příprava obsahuje zpracování technologického předpisu pro železobetonovou monolitickou konstrukci, návrh zařízení staveniště, časový harmonogram, položkový rozpočet, návrh strojní sestavy, kontrolní a zkušební plán, environmentální plán stavby a bezpečnost práce.
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Stress analysis of modified compact tension specimens: K-calibration curves
Seitl, Stanislav ; Viszlay, V.
Compact tension (CT) test is in engineering frequently used test for metallic materials to determiner fracture parameters/properties, e.g. fracture energy, fracture toughness, crack propagation rate, J-R curves etc. [20]. The modified compact tension (MCT) specimen for cement based composites has to be prepared due to negligible concentration around the holes for tenons. An accurate determination of fracture parameters requires the use of a valid calibration curves, there for in this contribution the stress analysis near the crack tip and calibration curve for modified compact tension test are introduced. The calibration curve is introduced for diameter 150 mm (the specimen could be easy made from the specimen for compression test) and includes all theoretical imperfections that results from preparation of the MCT specimens.
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Modified compact tension test: The influence of the steel bars position
Holušová, Táňa ; Seitl, Stanislav ; Fernández-Canteli, A.
Testing and analysis of fatigue behavior of homogeneous materials, such as concrete or other cement based composites, are one major problem being studied in this scientific field. In this contribution, adaptation of the compact tension test, well known its use in the testing of metallic materials, is pursued for crack propagation rate measurement on cement based composites using cylindrical specimens. In particular, the influence of the steel bars position on the fracture parameters is studied in the modified compact tension test. The numerical study is performed by ATENA 2D. The results are compared by Load-COD diagrams and the variation of the fracture parameters values is discussed.
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Removal of polyurea spray coatings from the surface of cement concrete by water jet technology
Ščučka, Jiří ; Bódi, Z. ; Hlaváček, Petr ; Klich, Jiří ; Martinec, Petr ; Foldyna, Josef
The paper is focused on the removal of polyurea spray coatings from the surface of cement concrete by the water jet technology. A series of experiments was conducted to disintegrate a defined polyurea spray coat layer on the surface of cement concrete tiles using different configurations of the water jet system. The results of these experiments have confirmed that the continuous water jet was highly effective in removing the spray coat, causing no damage to the concrete substrate underneath. The partial experimental results have also indicated that this process can be used to produce an anti-skid finish on polyurea spray coatings applied onto horizontal structures.
Plný tet: UGN_0398599 -  DOC
Plný text: content.csg - DOC
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Study of behavior of concrete and cement based composite materials exposed to high temperatures
Bodnárová, L. ; Horák, D. ; Válek, J. ; Hela, R. ; Sitek, Libor
The paper describes possibilities of observation of behaviour of concrete and cement based composite material exposed to high temperatures. Nowadays, for large-scale tests of behaviour of concrete exposed to high temperatures, testing devices of certified fire testing stations in the Czech Republic and surrounding states are used. These tests are quite expensive. For experimental verification of smaller test specimens, a testing device was built at the Technical University in Brno, where tests of thermal loading of concrete tests specimens of various sizes can be carried out (dimensions up to 800 x 800 x 800 mm or slabs up to 1100 mm of length). The testing device opens new ways of observation of behaviour of concrete and cement based composite materials exposed to high temperatures as well as preparation of specimens for observation of interaction of water jet and concrete degraded by action of high temperatures.
Plný tet: UGN_0398264 - DOC
Plný text: content.csg - DOC
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