Acta Polytechnica CTU Proceedings. 2021 ( vol. 29-31): Poslední příspěvky

Zobrazují se záznamy 21-40 z 42

    • NUMERICAL COMPARISON OF TRANSGINGIVAL AND SUBGINGIVAL DENTAL IMPLANTS IN REGARD TO THEIR STRESS DISTRIBUTIONS 

      Autor: Řehounek, Luboš; Jíra, Aleš; Javorská, Gabriela; Bodlák, Daniel
      (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 ...

    • MICRONIZED CONCRETE POWDER AS MIRCOFILLER IN CEMENT PASTE: INFLUENCE ON HYDRATION AND STRUCTURE 

      Autor: Topič, Jaroslav; Prošek, Zdeněk
      (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 ...

    • FIRE PROTECTION OF STEEL ELEMENTS USING LIGHTWEIGHT HYBRID CEMENT MORTAR 

      Autor: Šulc, Stanislav; Šmilauer, Vít; Šejna, Jakub; Wald, František
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      Material properties of steel structures are significantly reduced at high temperatures, so a fire protection has strong positive impact on the fire resistance of the structure. Fire resistance of steel elements can be ...

    • THERMO-MECHANICAL MODEL FOR CONCRETE PAVEMENT 

      Autor: Veselý, Jakub; Šmilauer, Vít
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      This paper describes a numerical thermo-mechanical model for concrete pavement, implemented in OOFEM software. The thermal part is a heat transfer problem with appropriate initial and boundary conditions (sun irradiation, ...

    • OPTIMIZATION OF TUNED MASS DAMPERS ATTACHED TO DAMPED STRUCTURES - MINIMIZATION OF MAXIMUM DISPLACEMENT AND ACCELERATION 

      Autor: Štěpánek, Jan; Máca, Jiří
      (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, ...

    • INCREASING THE BIOLOGICAL RESISTANCE OF GYPSUM BY MEANS OF SILVER, CALCIUM AND COPPER IONS 

      Autor: Prošek, Zdeněk; Sekavová, Hana; Ryparová, Pavla
      (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 ...

    • DETECTION OF THE PRESENCE OF MICROORGANISMS DURING PRODUCTION OF PLASTERBOARD 

      Autor: Sekavová, Hana; Prošek, Zdeněk; Ryparová, Pavla
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      This article is focused on detection microorganisms appearing during production of gypsum plasterboards. The research is carried out within the project TAČR ZÉTA TJ02000235 Sádrokarton se zvýšenou odolností proti bilogické ...

    • MODELLING OF TIME-DEPENDENT BEHAVIOUR OF PARTICULATE THERMOSET POLYMERS 

      Autor: Vozáb, Jan; Vorel, Jan
      (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 ...

    • SIZE EFFECT ON THE ULTIMATE DRYING SHRINKAGE OF CEMENT MORTAR: 1-YEAR EXPERIMENT AND NUMERICAL MODELING 

      Autor: Dohnalová, Lenka; Havlásek, Petr; Šmilauer, Vít; Reiterman, Pavel; Davidová, Vendula
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      The magnitude and time evolution of shrinkage are influenced by numerous factors which are implemented in the design codes often in a different way. The time-dependent behavior of concrete in structures sensitive to creep ...

    • PLASMA MODIFICATION OF MICROFIBERS - APPLICATION TO LIGHTWEIGHT CEMENT COMPOSITE CONTAINING RECYCLED CONCRETE 

      Autor: Ďureje, Jakub; Prošek, Zdeněk; Trejbal, Jan; Tesárek, Pavel; Potocký, Štěpán
      (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 ...

    • BIM – AN APPLICATION IN GEOTECHNICAL ENGINEERING 

      Autor: Vaníček, Ivan; Pruška, Jan; Jirásko, Daniel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      BIM model represents a significant step forward within the frame of the overall process of construction. This new approach goes from the assumption that up to date praxis, which is represented by different sets of 2D or ...

    • CHANGE OF A HIGHWAY ROUTE CAUSED BY A ROCKSLIDE 

      Autor: Kopecký, Miloslav; Brček, Martin; Frankovská, Jana; Ondrášik, Martin; Fraštia, Marek; Liščák, Pavel; Novotný, Jan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      During the spring of 2013, a relatively large rockslide with a total area of 96,952 m2 occurred in the eastern part of the Malá Fatra mountains. The anticipated depth of the slip surfaces was from 30 to 40 metres and the ...

    • LANDSLIDE MONITORING IN A BUILT-UP AREA 

      Autor: Černoch, Petr; Koštál, Jiří; Podojil, Adam
      (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 ...

    • FINITE ELEMENT IMPLEMENTATION OF GEOMETRICALLY NONLINEAR CONTACT 

      Autor: Faltus, Ondřej; Horák, Martin
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      The OOFEM finite element software has been recently updated to include contact algorithms for small strain applications. In this work, we attempt to extend the contact algorithms to large strain problems. Reviewing the ...

    • FOUNDATION OF THE NEW RAILWAY BRIDGE OVER THE NOSICKÁ DAM ON THE RIVER VÁH 

      Autor: Zaťko, Maroš
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      The new railway bridge over the Nosická dam is a part of the complex modernization of the railway corridor from Púchov to Žilina. Our company participated on the project using a wide variety of special foundation techniques ...

    • GEOTECHNICAL ANALYSIS OF TRANSFORMING A WATER MANAGEMENT STRUCTURE TO A TRANSPORTATION STRUCTURE 

      Autor: Slávik, Ivan; Hruštinec, Luboš
      (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 ...

    • RECENT ADVANCES IN SIMULATING LANDSLIDE AND DEBRIS FLOW 

      Autor: Wu, Wei
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      This paper summarizes the outcome of a research project funded by the European Commission on the simulation of landslide and debris flow. The numerical techniques adopted include the mesh-based method (FEM), the point-based ...

    • 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 

      Autor: Purkart, Pavel; Vodák, David; Javořík, Tomáš; Jacura, Martin
      (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 

      Autor: Týfa, Lukáš; Kruntorád, Jan; Tomaschko, Ondřej
      (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 ...

    • The assessment of priorities in the construction of new high-speed railway lines in Czech Republic by using the stem method 

      Autor: Purkart, Pavel; Kruntorád, Jan; Týfa, Lukáš
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      The aim of the paper is to set priority of The Fast Connection sections ("Rychlá spojení" in Czech, abbreviation "RS") building mentioned above by using the STEM method. The method is used to select projects with the maximum ...