Prohlížení Acta Polytechnica CTU Proceedings. 2023, vol. 40 dle názvu
Zobrazují se záznamy 1-20 z 20
-
Analysis of tunnel excavation based on linear DFN-FEM modelling
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Simulations of tunnel excavations have to take into account the natural occurrence of joints and faults in the surrounding rock mass, which dominantly control its mechanical response. In this paper, we present work in ... -
Application of cold atmospheric plasma for mold inactivation
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Mold growth in indoor interiors is an increasing problem that has adverse effects on both occupants and building materials. The aim of this study was to present the new environmentally friendly method (cold atmospheric ... -
Bacterially induced calcite formation at the surface of recycled concrete
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)The construction industry is one of the main sources of greenhouse gas emissions, and portland cement production is responsible for approximately 8 % of anthropogenic CO2 emissions. Microbially induced calcium precipitation ... -
Bar-supported and unsupported dental implants: a QCT-FEA study in human maxilla
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Two variants of implant-supported overdentures (IODs) were investigated by quantitative computed tomography-assisted finite element method (QCT-FEA) on a patient-specific CTreconstructed model of human maxilla. The analyzed ... -
Benchmark VERCORS 2022: blind prediction of time-dependent behavior of concrete containment building with low and high-fidelity models
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)The VERCORS program aims to acquire an extensive experimental dataset collected to provide a solid basis for numerical modeling of concrete containment buildings (CCBs). In order to cover the entire life-span of a real ... -
Comparison of behaviour of burnt beams models with effective and actual residual cross-sections in three point bending test
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Glued laminated timber beams exposed to fire of a variable duration were tested in three point bending. Three types of model geometries taking into account the effect of burning were created. Each model was examined for ... -
Dependence of mechanical and thermal properties on the composition of lightweight gypsum composites
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)One of the ways to use the treated gypsum waste is in gypsum mixtures for the production of gypsum blocks. Gypsum blocks can be used in standard interior as well as exterior applications and are made of gypsum, water, PP ... -
Effect of electric current on porosity of concrete
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)The paper describes the influence of electric current on the porosity of concrete samples after electrically accelerated tests and other electrokinetic treatments. Three different concrete mixtures consisting of CEM I ... -
Experimental analysis of the railway truss bridge using modern methods
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Experimental analyses of civil engineering structures have been carried out for decades. While in the past, mainly static load tests of new structures were performed, a few severe accidents with fatal results caused a lot ... -
Extracting general knowledge of model parameters for clays out of numerous laboratory tests
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)This paper is concerned with the process of determining the material parameters of advanced constitutive models for clays. Provided results are applicable already in the early stages of geotechnical survey when no detailed ... -
Generation of LDPM structure formed by Voronoi cells
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)A preliminary study of an approach to internal structure generation used in lattice discrete particle models (LDPMs) [1]. The presented method used for particle generation and placement is intended to help realistically ... -
Hygro-mechanical model for concrete pavement with long-term drying analysis
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Concrete pavements are subjected to the combination of moisture transport, heat transport and traffic loading. A hygro-mechanical 3D finite element model was created in OOFEM software in order to analyse the stress field ... -
Measurement and evaluation of cement paste porosity by electrochemical impedance spectroscopy
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Porosity is an important part of cement paste microstructure, which significantly influences the mechanical properties (especially durability and strength) of cement-based materials. Electrochemical impedance spectroscopy ... -
Modelling of laminated glass interlayer by fractional viscoelasticity
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Fractional calculus, i.e. the theory of derivatives and integrals of non-integer order, can be efficiently used for the theoretical modelling of viscoelastic materials. Our research is focused on the polyvinyl butyral which ... -
Return mapping scheme for the Hoek-Brown model with tension cut-off
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)The present paper revisits a stress update procedure for the Hoek-Brown plasticity model enhanced by a Rankine type of tension cut-off failure criterion. Limiting tensile stresses not only supports the behavior of weak ... -
The experimental evaluation of tensile forces in stays of a cable-stayed footbridge
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)The topic of this paper is an experimental analysis of the dynamic behaviour of stays of an existing footbridge focusing on determination of the tensile forces in stays. The examined structure was the footbridge across the ... -
The footbridge Jesípek – application of radar interferometry for dynamic response evaluation
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Recent advances in radar systems have led to the development of radar interferometry (RI) methods for contactless vibration monitoring of large-scale structures, i.e. bridges, water tower reservoirs, and factory chimneys. ... -
The influence of lithium water glass on the durability of concrete
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)The aim of the research is to verify the effect of lithium water glass on the durability and reduction of concrete absorption. For this purpose, the absorption test was made and the influence of the impregnation agent on ... -
Treatment of polypropylene microfibers by atmospheric and low-pressure plasma – application to a reinforced cement composite containing recycled concrete
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)The effect of atmospheric and low-pressure plasma modification on polypropylene (PP) microfibers was examined. Mechanical changes on the microfiber surfaces were observed using scanning electron microscopy (SEM). Next, ... -
Use of lightweight FFT-based algorithms for remote measurements using DIC
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Abrupt collapse events that result in casualties due to failure of load-bearing structures have been reported in recent years. Continuous remote monitoring of these structures, assessing the behavior under operational load, ...