Acta Polytechnica CTU Proceedings. 2017, vol. 13

 

Zobrazují se záznamy 1-20 z 31

    • WANG TILES LOCAL TILINGS CREATED BY MERGING EDGE-COMPATIBLE FINITE ELEMENT MESHES 

      Autor: Zrůbek, Lukáš; Kučerová, Anna; Doškář, Martin
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      In this contribution, we present the concept of Wang Tiles as a surrogate of the periodic unit cell method (PUC) for modelling of materials with heterogeneous microstructures and for synthesis of micro-mechanical fields. ...

    • METHODOLOGY FOR MEASURING THE SHEAR STRESS OF PLASTERBOARDS 

      Autor: Zobal, Ondřej; Jára, Robert; Hataj, Martin
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      Plasterboards have to meet many requirements for certification. The mechanical properties of itself plasterboard are one of them. The important mechanical property of the plasterboard is the shear strength perpendicular ...

    • THE OCCURRENCE OF SYNCHRONIZED JUMPING CROWD AT SPORTS STADIUMS 

      Autor: Verner, Martin
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      Since the age of the Rome Empire, people have been going for fun at the stadiums. Today, important reasons for visiting the stadium are sport games or cultural performances. The text is about occurrence of specific types ...

    • ASSESSMENT OF 2D-DIC STOCHASTIC PATTERNS 

      Autor: Antoš, Jakub; Nežerka, Václav; Somr, Michael
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      Cost of experimental testing of materials and structures subjected to mechanical loading often constitutes a significant portion of a project budget. Therefore a collection of data in a maximum possible amount is desirable. ...

    • VARIATIONALLY-BASED EFFECTIVE DYNAMIC THICKNESS FOR LAMINATED GLASS BEAMS 

      Autor: Schmidt, Jaroslav; Zemanová, Alena; Janda, Tomáš; Zeman, Jan; Šejnoha, Michal
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      Laminated glass, consisting of glass layers connected with transparent foils, has found its applications in civil, automotive, or marine engineering. Due to a high contrast in layer properties, mechanical response of ...

    • PERFORMANCE OF CEMENT COMPOSITES REINFORCED WITH SURFACE-MODIFIED POLYPROPYLENE MICRO- AND MACRO-FIBERS 

      Autor: Antoš, Jakub; Dejdar, Lukáš; Trejbal, Jan; Prošek, Zdeněk
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      This paper focuses on the mechanical properties investigation of cement pastes reinforced with surface treated polymer fibers. The cement matrix was composed of Portland cement (CEM I 42.5 R, w/c ratio equal to 0.4). Two ...

    • COUPLED SIMULATION FOR FIRE-EXPOSED STRUCTURES USING CFD AND THERMO-MECHANICAL MODELS 

      Autor: Šulc, Stanislav; Šmilauer, Vít; Wald, František
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      Fire resistance of buildings is based on fire tests in furnaces with gas burners. However, the tests are very expensive and time consuming. This article presents a coupled simulation of an element loaded by a force and a ...

    • PULLOUT BEHAVIOR OF OXYGEN PLASMA TREATED POLYMER FIBERS FROM CEMENT MATRIX 

      Autor: Trejbal, Jan; Horová, Tereza; Prošek, Zdeněk
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      The aim of this work is to describe bonding properties between surface treated polymer fibers and a cement matrix. In order to increase an interaction between the matrix and fiber surfaces, two fiber types having approx. ...

    • EVALUATION OF EFFECTIVE PROPERTIES OF BASALT TEXTILE REINFORCED CERAMIC MATRIX COMPOSITES 

      Autor: Valentová, Soňa; Hrbek, Vladimír; Šejnoha, Michal
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      The present paper is concerned with the analysis of a ceramic matrix composite, more specifically the plain weave textile fabric composite made of basalt fibers embedded into the pyrolyzed polysiloxane matrix. Attention ...

    • HYDRATION PROCESS AND MECHANICAL PROPERTIES OF CEMENT PASTE WITH RECYCLED CONCRETE POWDER AND SILICA SAND POWDER 

      Autor: Topič, Jaroslav; Prošek, Zdeněk
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      Recycled concrete powder (RCP) mostly consisting of cement paste could be reused as partial cement replacement. The aim of this paper is to compare hydration and mechanical properties of RCP and two types of silica sand ...

    • OPTIMIZATION-BASED APPROACH TO TILING OF FINITE AREAS WITH ARBITRARY SETS OF WANG TILES 

      Autor: Tyburec, Marek; Zeman, Jan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      Wang tiles proved to be a convenient tool for the design of aperiodic tilings in computer graphics and in materials engineering. While there are several algorithms for generation of finite-sized tilings, they exploit the ...

    • COMPARISON OF FAILURE CRITERIA FOR WOOD IN TENSILE-SHEAR STRESS STATE 

      Autor: Šmídová, Eliška; Kabele, Petr
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      An orthotropic failure criterion enhancing the Lourenco's criterion by a shear strength multiplier and a maximum shear strength upper bound has been recently proposed and validated for timber under tensile and shear loading ...

    • MODAL ANALYSIS FOR REVISION OF A FEM MODEL OF A STEEL TRUSS BEAM 

      Autor: Venglar, Michal; Sokol, Milan; Marfoldi, Monika
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      The paper deals with a preparation of a complex FEM model for a local damage detection. The initial verified and validated three-dimensional FEM model of a steel truss bridge in laboratory is revised step-by-step to achieve ...

    • PLASMA TREATMENT IMPACT ON PHYSICAL AND CHEMICAL PROPERTIES OF POLYMERIC FIBERS 

      Autor: Hlůžek, Radim; Prošek, Zdeněk; Trejbal, Jan; Fládr, Josef; Potocký, Štepán
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      Presented work focuses on chemical and physical properties of plasma modified polymeric macro-fibers. Polyethylene terephthalate (PET) and polypropylene (PP) fibers having approx. 300 μm in diameter were modified using ...

    • MICRO-MECHANICAL PERFORMANCE OF CONCRETE USED AS RECYCLED RAW MATERIAL IN CEMENTITIOUS COMPOSITE 

      Autor: Hrbek, Vladimír; Koudelková, Veronika; Prošek, Zdeněk; Tesárek, Pavel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      The reduction of industrial pollution is recently one of main goals over all fields. In civil engineering, re-cycling of structural waste provides wide opportunity contributing this effort. This paper focus on re-use of ...

    • NON-INVASIVE INVERSE PROBLEM IN CIVIL ENGINEERING 

      Autor: Havelka, Jan; Sýkora, Jan; Kučerová, Anna
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      In this contribution we focus on recovery of spatial distribution of material parameters utilizing only non-invasive boundary measurements. Such methods has gained its importance as imaging techniques in medicine, geophysics ...

    • SYNTHESIZED ENRICHMENT FUNCTIONS FOR EXTENDED FINITE ELEMENT ANALYSES WITH FULLY RESOLVED MICROSTRUCTURE 

      Autor: Doškář, Martin; Novák, Jan; Zeman, Jan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      Inspired by the first order numerical homogenization, we present a method for extracting continuous fluctuation fields from the Wang tile based compression of a material microstructure. The fluctuation fields are then used ...

    • FOAMED CEMENT COMPOSITES: DETECTION OF THE MODULUS OF ELASTICITY USING DIC ANALYSIS AND COMPARISON WITH OTHER METHODS 

      Autor: Ďureje, Jakub; Prošek, Zdeněk
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      A modulus of elasticity was determined for eight differently foamed cement paste samples. Samples were loaded in the laboratory by a hydraulic press. The force acting on the sample was read directly from the laboratory ...

    • THE EFFECT OF PLASTICIZER ON MECHANICAL PROPERTIES OF THE CEMENT PASTE WITH FINE GROUND RECYCLED CONCRETE 

      Autor: Hrůza, Jaromír; Prošek, Zdeněk
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      This article deals with the usage of recycled concrete, which arises from the demolition of concrete structures. The work is focused on the development of mechanical properties (Young's modulus, compressive and flexural ...

    • ON DEVELOPMENT OF THE INTERACTIVE DESIGN TOOL BASED ON ISOGEOMETRIC ANALYSIS 

      Autor: Dvořáková, Edita; Patzák, Bořek
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      Isogeometric analysis is a new concept of Finite element method which has been proposed to bridge the gap between the CAD systems and the FEM solvers. In Isogeometric analysis, the same basis functions, typically splines ...