Browsing Acta Polytechnica CTU Proceedings. 2021 ( vol. 29-31) by Title
Now showing items 1-20 of 42
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APPLICATION OF THE MORI-TANAKA METHOD TO DESCRIBE THE RATE-DEPENDENT BEHAVIOR OF UNIDIRECTIONAL FIBROUS COMPOSITES
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)This paper examines the possibility of using the Mori-Tanaka micromechanical model describe the rate dependent behavior of the polymer matrix based fibrous composites. The generalized Leonov model is adopted to capture the ... -
AUTOMATED BIM ENTITY RECONSTRUCTION FROM UNSTRUCTURED 3D POINTCLOUDS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)Laser scanning is used widely in architecture and construction to document existing buildings by providing accurate data for creating a 3D model. The output is a set of data points in space, so-called point cloud. While ... -
BEAM ELEMENT UNDER FINITE ROTATIONS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The present work focuses on the 2-D formulation of a nonlinear beam model for slender structures that can exhibit large rotations of the cross sections while remaining in the small-strain regime. Bernoulli-Euler hypothesis ... -
BIM – AN APPLICATION IN GEOTECHNICAL ENGINEERING
(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 ... -
Calculation of the minimal length of the high-speed line
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)This paper explores the minimum length of continuous sections of the high-speed line. The minimum length is examined in terms of the maximum speed of high-speed vehicles. Both traditional trainsets consisting of traction ... -
CHANGE OF A HIGHWAY ROUTE CAUSED BY A ROCKSLIDE
(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 ... -
COMPARING THE HOEK-BROWN AND MOHR-COULOMB FAILURE CRITERIA IN FEM ANALYSIS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)This paper revisits the issue of a potential substitutions of the Hoek-Brown failure model by the standard Mohr-Coulomb model in the stability analysis of rock masses. The derivation of equivalent shear strength parameters ... -
DETECTION OF THE PRESENCE OF MICROORGANISMS DURING PRODUCTION OF PLASTERBOARD
(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 ... -
Energy saving in rail transport
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)Aim of this article is to introduce and present advantages and possibilities of using simulation tools to calculate energy flows of tractive vehicle in all phases of its ride. The focus is on the braking phase, especially ... -
EVALUATION OF IMPACT OF ELEVATED TEMPERATURES ON YOUNG’S MODULUS OF GLT BEAMS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The influence of elevated temperatures on mechanical behavior of glued laminated timber beams is examined on the basis of tensile tests. Dog bone samples prepared from beams exposed to fire of variable duration were ... -
FINITE ELEMENT IMPLEMENTATION OF GEOMETRICALLY NONLINEAR CONTACT
(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 ... -
FIRE PROTECTION OF STEEL ELEMENTS USING LIGHTWEIGHT HYBRID CEMENT MORTAR
(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 ... -
FOUNDATION OF THE NEW RAILWAY BRIDGE OVER THE NOSICKÁ DAM ON THE RIVER VÁH
(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 ... -
FRACTURE ENERGY OF ILLITIC RAMMED EARTH WITH HIGH WATER-CLAY RATIO
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The article is focused on design of mixture of rammed earth, producing, testing and determination of fracture energy of unfired rammed earth and its stress-strain curve in tensile bending test. Three different mixtures of ... -
GEOTECHNICAL ANALYSIS OF TRANSFORMING A WATER MANAGEMENT STRUCTURE TO A TRANSPORTATION STRUCTURE
(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 ... -
High-speed rail network and periodic timetable: a comparative analysis of operational concepts
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)This paper compares chosen European high-speed railway (HS) networks in terms of their offer of HS passenger service. The criteria chosen for comparison are network topology, degree of service periodicity and degree of ... -
High-speed rail – highway 2.0?
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)High-speed rail lines should make it possible to fully replace air transport over the medium distances of Europe (about 500 km). In the Czech Republic, they are beginning to design. Estimates suggest that in five years, ... -
INCREASING THE BIOLOGICAL RESISTANCE OF GYPSUM BY MEANS OF SILVER, CALCIUM AND COPPER IONS
(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 ... -
INFLUENCE OF EARTH COMPOSITION ON ADSORPTION CAPACITY OF METHYLENE BLUE DYE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)Final properties of unfired earth are influenced by composition of earth mixtures. Methylene blue test could be useful method for analysis of earth composition. This would facilitate of designing unfired earth building ... -
LANDSLIDE MONITORING IN A BUILT-UP AREA
(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 ...