Prohlížení Acta Polytechnica CTU Proceedings. 2021 ( vol. 29-31) dle názvu
Zobrazují se záznamy 15-34 z 42
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GEOTECHNICAL ANALYSIS OF TRANSFORMING A WATER MANAGEMENT STRUCTURE TO A TRANSPORTATION STRUCTURE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)This paper analyzes the transformation of the culvert channel under the supply channel of the Gabcíkovo Waterworks into a road tunnel structure and the impact this had on the surrounding rock environment. It presents the ... -
High-speed rail network and periodic timetable: a comparative analysis of operational concepts
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)This paper compares chosen European high-speed railway (HS) networks in terms of their offer of HS passenger service. The criteria chosen for comparison are network topology, degree of service periodicity and degree of ... -
High-speed rail – highway 2.0?
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)High-speed rail lines should make it possible to fully replace air transport over the medium distances of Europe (about 500 km). In the Czech Republic, they are beginning to design. Estimates suggest that in five years, ... -
INCREASING THE BIOLOGICAL RESISTANCE OF GYPSUM BY MEANS OF SILVER, CALCIUM AND COPPER IONS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The article focuses on the effects of additives increasing biological resistance of gypsum against degradation of the material. In this study we use silver nitrate, calcium oxide and copper sulphate as an additive that ... -
INFLUENCE OF EARTH COMPOSITION ON ADSORPTION CAPACITY OF METHYLENE BLUE DYE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)Final properties of unfired earth are influenced by composition of earth mixtures. Methylene blue test could be useful method for analysis of earth composition. This would facilitate of designing unfired earth building ... -
LANDSLIDE MONITORING IN A BUILT-UP AREA
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The article deals with the evaluation and comparison of measured data from geotechnical monitoring of a gabion wall and an adjacent slope. In 2015, new anomalous phenomena related to deformations and a shift in the area ... -
LOCALIZATION ANALYSIS OF DAMAGE FOR ONE-DIMENSIONAL PERIDYNAMIC MODEL
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)Peridynamics is a recently developed extension of continuum mechanics, which replaces the traditional concept of stress by force interactions between material points at a finite distance. The peridynamic continuum is thus ... -
Maintaining the competitiveness of the czech railway industry
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The development of foreign trade plays an important role in the Czech economy. The important foreign trade commodity item is Machinery and transport equipment (SITC 7). Railway vehicles is a part of this category, other ... -
MECHANICAL AND CHEMICAL ACTIVATION OF BLAST FURNACE SLAG AND ITS INFLUENCE ON THE MECHANICAL PROPERTIES OF THE RESULTING CEMENT PASTE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The usage of waste materials is a very important global topic. The large amount of waste everywhere in the world needs to be processed or disposed. Landfilling is not an option anymore, because of European legislation and ... -
MICRONIZED CONCRETE POWDER AS MIRCOFILLER IN CEMENT PASTE: INFLUENCE ON HYDRATION AND STRUCTURE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The reuse of old concrete as a coarse and fine recycled aggregate in cement composites is relatively well researched, and therefore a very fine fraction of recycled concrete was used in this paper. When using a very fine ... -
MODELING TIME-DEPENDENT DEFORMATIONS OF CONCRETE MEMBERS SUBJECTED TO SYMMETRIC AND ASYMMETRIC DRYING
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The time-dependent behavior of concrete members with uniform cross-section subjected to symmetric drying can be predicted with one of many models anchored in the design codes. Since these models use the cross-sectional ... -
MODELLING OF TIME-DEPENDENT BEHAVIOUR OF PARTICULATE THERMOSET POLYMERS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)A preliminary study of a numerical model describing the behaviour of polymer-based composites is presented. The numerical model consists of three main parts. The first is the microplane M4 model, which is the main part of ... -
NUMERICAL COMPARISON OF TRANSGINGIVAL AND SUBGINGIVAL DENTAL IMPLANTS IN REGARD TO THEIR STRESS DISTRIBUTIONS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)Most modern dental implants differentiate in regard to the fixation of the abutment into two main categories - the external or internal hexagon or octagon. We performed mechanical tests according to the ČSN EN ISO 14801 ... -
NUMERICAL SIMULATION OF SLUMP FLOW TEST OF CEMENT PASTE COMPOSITES
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)This study presents a numerical simulation of the mini-slump flow test performed on the Haegerman table, according to EN 1015-3. The two-dimensional axisymmetrical Volume of fluid (VOF) model is used for the calculation. ... -
ON COMPARISON OF 3D ISOGEOMETRIC TIMOSHENKO AND BERNOULLI BEAM FORMULATIONS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)Application of isogeometric analysis (IGA) for curved beams is very convenient for its ability of exact representation of curved geometries. Several beam formulation has been presented since the introduction of IGA. In ... -
OPTIMIZATION OF TUNED MASS DAMPERS ATTACHED TO DAMPED STRUCTURES - MINIMIZATION OF MAXIMUM DISPLACEMENT AND ACCELERATION
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)A tuned mass damper is a device, which can be highly helpful while dealing with dynamic behaviour of structures. Its proper design is conditioned by knowledge of both loading and the structure properties. In many cases, ... -
PLASMA MODIFICATION OF MICROFIBERS - APPLICATION TO LIGHTWEIGHT CEMENT COMPOSITE CONTAINING RECYCLED CONCRETE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The article deals with the optimalization of composition for reinforced lightweight cement composite containing micronized recycled concrete, which will be used to produce masonry blocks. The composite material is reinforced ... -
Possibilities of high-speed railway turnout data description
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)This paper aims to summarize possibilities how to create data models of high-speed railway turnouts. The turnouts designed for high-speed operation require specific geometric solution. As the UIC RailTopoModel is considered ... -
Possible changes in transport conception of international and long-distance railway connections relating the construction of new high-speed railway lines in the Czech Republic
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The aim of this article is to deal with the issue of high-speed railway lines (HSL) in the Czech Republic in response to the Fast connections conception ("Rychlá spojení" in Czech, abbreviation "RS"). Currently the RS1, ... -
Railway superstructure for high-speed rails
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The construction of the track is solved as a conventional (with track ballast) or as a ballastless track (without track ballast). When deciding on the choice of the most suitable track design for high-speed rail, it is ...