Acta Polytechnica CTU Proceedings. 2018, vol. 15

 

Zobrazují se záznamy 1-20 z 26

    • IMAGE SYNTHESIS OF METAL FOAM MICRO-STRUCTURE WITH THE USE OF WANG TILES 

      Autor: Zrůbek, Lukáš; Doškář, Martin; Kučerová, Anna; Meneses-Guzmán, Marcela; Rodríguez-Méndez, Francisco; Chiné, Bruno
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      In this paper we present our recent work focused on the analysis of the abilities of Wang Tiles method and Automatic tile design method to synthesize the micro-structure of cellular materials, especially particular type ...

    • GEOMETRY AND MECHANICAL PROPERTIES OF A 3D-PRINTED TITANIUM MICROSTRUCTURE 

      Autor: Řehounek, Luboš; Hájková, Petra; Vakrčka, Petr; Jíra, Aleš
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      Construction applications sometimes require use of a material other than construction steel or concrete – mainly in cases, where strength to weight ratio needs to be considered. A suitable solution to this problem are ...

    • ASSESSMENT OF ADHESION BETWEEN MINERAL AGGREGATE AND BITUMINOUS BINDER USING DIGITAL IMAGE ANALYSIS 

      Autor: Trejbal, Jan; Prošek, Zdeněk; Valentová, Tereza
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      This work presents how to assess a rate of adhesion between bituminous binder and mineral aggregate. Asphalt mixtures composed from grade bitumen 50/70, reference or modified with adhesion promoters based on amines, and ...

    • CHARACTERIZATION OF CEMENT-BASED COMPOSITE EXPOSED TO HIGH TEMPERATURES VIA ULTRASONIC PULSE METHOD 

      Autor: Rozsypalová, Iva; Vyhlídal, Michal; Dvořák, Richard; Majda, Tomáš; Topolář, Libor; Pazdera, Luboš; Šimonová, Hana; Keršner, Zbyněk
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      In this paper, the attention is paid to the investigation of the influence of high temperature acting on specimens made from specially designed cement-based composite. The experimental programme was carried out on six sets ...

    • STRENGTH OF COMPOSITE YARN UNDER BIAXIAL LOADING 

      Autor: Valentová, Soňa; Hrbek, Vladimír; Vorel, Jan; Šejnoha, Michal
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The present paper is concerned with two types of periodic unit cell of composite yarn with different geometry but the same material properties. Their macroscopic response under tensile and compressive loading in the ...

    • VALIDATION OF LINKED SIMULATION FOR FIRE-EXPOSED CONCRETE STRUCTURES 

      Autor: Šulc, Stanislav; Šmilauer, Vít; Wald, František
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      This article presents linked computational approach for fire simulation and its effects on structure using adiabatic surface temperature. The simulation solves a weakly-linked problem, consisting of computational fluid ...

    • CONSTITUTIVE MODEL FOR TIMBER FRACTURE USED FOR FE SIMULATION OF LVL ARCH 

      Autor: Šmídová, Eliška; Kabele, Petr
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      Non-linear finite element simulation of four-point bending test of a small-size arch is described in this paper. The arch of 780mm span is made of Yellow Poplar (Liriodendron tulipifera) laminated veneer lumber (LVL) and ...

    • RELATION BETWEEN STATIONARY AND MOVING PEDESTRIAN LOAD MODELS 

      Autor: Štěpánek, Jan; Máca, Jiří
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The dynamic analysis of footbridges became common in recent years, but the approach to modelling pedestrian induced load is still inconsistent. This paper compares two different ways of modelling single pedestrian load. ...

    • WHICH FANS ARE THE BIGGEST ACCELERATION OF THE GRANDSTAND? 

      Autor: Verner, Martin
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The fans of AC Sparta Prague and SK Slavie Prague have been arguing about the fact whose fans support their team better since the end of 20th century. There have been made many experiments on the intensity of vibrations ...

    • MODELING OF UNDERGROUND STRUCTURES SUBJECTED TO EARTHQUAKE BY COMBINING 1D FREE-FIELD AND 2D PSEUDO-STATIC ANALYSES 

      Autor: Poklopová, Tereza; Pavelcová, Veronika; Janda, Tomáš; Šejnoha, Michal
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The paper deals with the evaluation of tunnel construction subjected to earthquake using a pseudostatic analysis combined with the finite element method. The initial stage of calculation is concerned with the design of ...

    • APPLICATION OF THE MODIFIED MAGNETOELASTIC METHOD AND AN ANALYSIS OF THE MAGNETIC FIELD 

      Autor: Klier, Tomáš; Míčka, Tomáš; Polák, Michal; Plachý, Tomáš; Hedvábný, Milan; Jelínek, Roman; Bláha, Filip
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      In the technical praxis there is very often a need of axial force determination in the important structural elements of a building during its construction or operational state. The paper presents practical application of ...

    • THE INFLUENCE OF BOUNDARY CONDITIONS ON THE RESPONSE OF UNDERGROUND STRUCTURES SUBJECTED TO EARTHQUAKE 

      Autor: Pavelcová, Veronika; Poklopová, Tereza; Janda, Tomáš; Šejnoha, Michal
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The paper deals with the prediction of the response of a real underground structure subjected to earthquake. A fully dynamic analysis is carried out in the GEO5 FEM program using the Finite Element Method. Limiting our ...

    • DETERMINATION OF HYGROEXPANSION COEFFICIENTS OF WOOD USING ANALYTICAL AND NUMERICAL HOMOGENIZATION 

      Autor: Kucíková, Lucie; Šejnoha, Michal; Vorel, Jan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      This paper is concerned with the determination of hygroexpansion coefficients of wood. Wood is a naturally hygroscopic material, attracting moisture from its surroundings. Its dimensions change depending on the actual ...

    • MOLECULAR STATICS SIMULATION OF NANOINDENTATION USING ADAPTIVE QUASICONTINUUM METHOD 

      Autor: Mikeš, Karel; Rokoš, Ondřej; Peerlings, Ron H. J.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      In this work, molecular statics is used to model a nanoindentation test on a two-dimensional hexagonal lattice. To this end, the QuasiContinuum (QC) method with adaptive propagation of the fully resolved domain is used to ...

    • MODELING OF MONOCRYSTALLINE MAGNESIUM MICROBEAM BENDING 

      Autor: Němeček, Jiří; Maňák, Jan; Němeček, Jiří
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      This paper presents a numerical simulation of a micro-scale experiment on a magnesium alloy. Micro cantilever beams were fabricated using Focused Ion Beam technology in a single crystal of Mg. The cantilever beams have ...

    • MODULUS OF ELASCITY OF UNFIRED RAMMED EARTH 

      Autor: Mužíková, Barbora; Plaček Otcovská, Tereza; Padevět, Pavel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The article is focused on measurement and evaluation of elastic modulus of unfired rammed earth and determination of stress-strain curve in compressive test. Sets of different containt of clay, sand and water were made and ...

    • DETERMINATION OF DRYING TIME OF THE RAMMED EARTH WALLS 

      Autor: Plaček Otcovská, Tereza; Mužíková, Barbora; Padevět, Pavel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The unburned earth is a building material with long history of use. Buildings made of unburned clay are all over the world. But at present, unburned earth is minority building material and its properties are not sufficiently ...

    • MICROSCOPIC AND PHASE ANALYSIS OF CEMENT PASTE CONTAINING WASTE MICRONIZED MARBLE POWDER 

      Autor: Prošek, Zdeněk; Tesárek, Pavel; Trejbal, Jan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The article focuses on the impact of waste marble powder on resulting cement composites. We investigate of influence waste marble powder on the hydration process and hence the resulting phase composition. The hydration ...

    • THE EFFECT OF MICRO-SILICA ON THE MICROSCOPIC FEATURES OF THE UHPC COMPOSITE AND ITS INTER-FACIAL TRANSITION ZONE 

      Autor: Hrbek, Vladimír; Prošek, Zdeněk; Chylík, Roman; Vráblík, Lukáš
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The uplift of concrete overall macroscopic performance by way of alternative additives is commonly used technique. In case of ultra high performance concrete (UHPC), micro-silica is added to the mixture as a micro-filler ...

    • CEMENT MATRIX CONTAINING MICRONIZED RECYCLED CONCRETE AND THE INFLUENCE OF ADDITIVES 

      Autor: Ďureje, Jakub; Prošek, Zdeněk; Hrůza, Jaromír; Tesárek, Pavel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The article deals with the selection of a suitable additives in cement composite material for the production of a masonry block. The blocks contains recycled concrete which replacing 40% cement. The recyclate comes from ...