Prohlížení Acta Polytechnica CTU Proceedings. 2018, vol. 15 dle názvu

Zobrazují se záznamy 1-20 z 26

    • 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 ...

    • 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 ...

    • BAYESIAN INFERENCE OF HETEROGENEOUS VISCOPLASTIC MATERIAL PARAMETERS 

      Autor: Janouchová, Eliška; Kučerová, Anna
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      Modelling of heterogeneous materials based on randomness of model input parameters involves parameter identification which is focused on solving a stochastic inversion problem. It can be formulated as a search for probabilistic ...

    • BOND CONNECTIONS OF HIGH PERFORMANCE CONCRETE (HPC) AND STEEL: "EXPERIMENTAL VERIFICATION OF SELECTION GLUED FOR TWO DIFFERENT SURFACES OF STEEL" 

      Autor: Blažek, Tomáš; Řepka, Jakub; Vlach, Tomáš
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      This article deals with the test of selected adhesives for glued connection of high performance concrete and steel plates with various surface treatments. Results of this experiment can be used as a basis for the possible ...

    • 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 ...

    • 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 ...

    • COMPARISON OF DRYING SHRINKAGE AND DRYING CREEP KINETICS IN CONCRETE 

      Autor: Dohnalová, Lenka; Havlásek, Petr
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The aim of this paper is to show and compare the time evolution of drying shrinkage and drying creep in concrete from three different perspectives. The first one analyzes the basic equations defined in the most common ...

    • 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 ...

    • 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 ...

    • 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 ...

    • EFFECT OF VISCOUS DAMPING IN NUMERICAL CALCULATION OF CABLE-MEMBRANE STRUCTURES BY THE METHOD OF DYNAMIC RELAXATION 

      Autor: Huttner, Miloš; Fajman, Petr
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The aim of this article is to assess the speed of convergence of numerical calculation of cable-membrane structures using dynamic relaxation method in the process of finding critical damping pre-calculated on undamped ...

    • 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 ...

    • 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 ...

    • ISOGEOMETRIC BEAM ELEMENT EXTENDED FOR GRIDSHELL ANALYSIS 

      Autor: Dvořáková, Edita; Patzák, Bořek
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The design of gridshell structures is a complicated process, as the resulting shape of structure depends on initial undeformed grid geometry as well as on the history of boundary conditions used to form the final structure. ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • PERFORMANCE EVALUATION OF DIFFERENT LINEAR EQUATION SOLVERS FOR SOLVING NONLINEAR FE PROBLEMS ON MULTICORE ARCHITECTURES 

      Autor: Bošanský, Michal; Patzák, Bořek
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The aim of this paper is to evaluate the performance of existing parallel linear equation solvers to solving large-scale, nonlinear finite element analysis problems on systems with distributed memory. The parallel approach ...