Řada stavební. 2017, roč. 17 / Civil Engineering Series. 2017, vol. 17

Permanent URI for this collectionhttp://hdl.handle.net/10084/122540

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Now showing 1 - 20 out of 39 results

Non–linear analysis of slender masonry beam
(Vysoká škola báňská - Technická univerzita Ostrava, 2017) Vokál, Marek; Drahorád, Michal
This paper deals with numerical analysis and design of slander prismatic masonry beams loaded predominantly by axial force and bending moment in plane of the principal moment of inertia. Because of the material non-linearity, classical mathematical theory of slender columns cannot be applied for masonry elements, therefore the proposed method uses iterative non–linear calculation considering both material and geometrical non–linearity.
Dynamic post-buckling behavior
(Vysoká škola báňská - Technická univerzita Ostrava, 2017) Šnirc, Ľuboš; Grmanová, Alžbeta; Ravinger, Ján
Geometric non-linear theory has been used to describe the post-buckling behavior of slender web. Hamilton’s principle in increments has been used. Examples of dynamic post-bucking behavior of slender web loaded in compression are presented. Influence of residual stresses to frequency of slender web is a base for non-destructive method of investigation of structures.
Determination of stress intensity factor value for chevron-notched specimens – pilot study
(Vysoká škola báňská - Technická univerzita Ostrava, 2017) Sobek, Jakub; Seitl, Stanislav
The description of material behavior is one of important information for its application in civil engineering. One area is covering fracture mechanical properties. For evaluation of the fracture toughness values, the knowledge of calibration curve is important. The paper is aimed on the numerical modelling of the test specimens with a chevron notch serving as an initiator of the stress distribution at the crack tip. The three-point bending test configuration with a chevron notch is used for the simulation given by plane model with different layer width of cross section part and output is given by the value of the stress intensity factor KI for tension loading mode.
Static and dynamic stresses in pipeline built on damaged foundation
(Vysoká škola báňská - Technická univerzita Ostrava, 2017) Shatskyi, Ivan; Struk, Andrii; Vaskovskyi, Maksym
A deformation model of the buried pipeline under complicated geotechnical conditions of local ground failure is proposed. The effect of displacement of discontinuities in failed ground on the stressed condition and limited equilibrium of pressurized pipe has been studied.
Shock wave in a pile immersed into viscoplastic medium
(Vysoká škola báňská - Technická univerzita Ostrava, 2017) Shatskyi, Ivan; Perepichka, Vasyl
The wave problem of perturbation propagation along an elastic pile interacting with the medium is investigated using the model of viscoplastic friction. An exact solution of the problem is obtained using the Laplace transforms for an arbitrary time of the loading period. The diagrams for velocity and stresses have been constructed.
Analytical estimations of strength of two layer coating loaded along a line
(Vysoká škola báňská - Technická univerzita Ostrava, 2017) Shatskyi, Ivan; Makoviichuk, Mykola; Ropyak, Lubomyr
The engineering calculation procedure of the stress-strain state of the two-layer coating under the load localized along a line is proposed. The plane coupled problem of the plate equilibrium has been formulated. The analytical solutions of the problem have been obtained and compared with previous results for the uncoupled problem. The analytical estimations of strength of the composite coating have been given
Quantification of influence of epoxy layer between interface steel-concrete on calibration curves for modified compact tension test
(Vysoká škola báňská - Technická univerzita Ostrava, 2017) Seitl, Stanislav; Miarka, Petr; Sobek, Jakub
The objective of this study is to investigate the use of compact tension specimen calibration curves for evaluation data of fracture properties measurement performed on modified compact tension specimen made from cement based composites. From literature, the well-known calibration curve for compact tension specimen is compared with calibration curves for Modified compact tension specimen that are obtained from numerical calculation. The obtained results are quantified and accuracy of solution is discussed. The suggested curves could be preferably used for determining of the fracture parameters.
Selection, maintenance and acoustic diagnostics of expansion joints in bridges located in areas with ground deformations
(Vysoká škola báňská - Technická univerzita Ostrava, 2017) Salamak, Marek; Żuchowski, Rafał
In the paper are presented general rules of the assortment of expansion joints in bridges located in areas being under the mining impacts. The maintenance problems associated with ground deformations are also mentioned. The special attention is given to the noise emitted by expansion joint devices. A legal status in the protection from noise and factors affecting this noise are discussed.
Dynamic response of railway bridges subjected to passing vehicles
(Vysoká škola báňská - Technická univerzita Ostrava, 2017) Moravčík, Milan; Moravčík, Martin
This paper discusses some issues related to dynamic effects in railway bridges focussed on the dynamic behaviour of the small and medium span simply supported railway bridges subjected to a series of moving vehicle. Presented parametric study is focused on the dynamic deflection of the simply supported railway bridge of the span Lb = 38 m, due to the series moving loads representing a conventional train with the IC-coaches, with the impact to the speed up to 160 km/h applied in Slovakia.
Maintenance optimization of industrial chimneys exposed to carbonation
(Vysoká škola báňská - Technická univerzita Ostrava, 2017) Mlčoch, Jan; Marková, Jana; Sýkora, Miroslav
The paper is focused on the deterioration of industrial reinforced concrete chimneys caused by carbonation. It is considered that a chimney has to be repaired when more than 30% of its surface is affected by visible corrosion-induced cracks. An optimal maintenance strategy aims at the postponement of this state beyond the intended service life of the chimney with minimum maintenance costs.
Failure probability estimation using asymptotic sampling and its dependence upon the selected sampling scheme
(Vysoká škola báňská - Technická univerzita Ostrava, 2017) Martinásková, Magdalena; Vořechovský, Miroslav
The article examines the use of Asymptotic Sampling (AS) for the estimation of failure probability. The AS algorithm requires samples of multidimensional Gaussian random vectors, which may be obtained by many alternative means that influence the performance of the AS method. Several reliability problems (test functions) have been selected in order to test AS with various sampling schemes: (i) Monte Carlo designs; (ii) LHS designs optimized using the Periodic Audze-Eglājs (PAE) criterion; (iii) designs prepared using Sobol’ sequences. All results are compared with the exact failure probability value.
Interaction between edge-crack and aggregate in silicate-based composite
(Vysoká škola báňská - Technická univerzita Ostrava, 2017) Malíková, Lucie; Klusák, Jan
The paper deals with investigation of the interaction between an edge-crack and an aggregate in a silicate-based composite, because adding of aggregates into basic matrix material can improve the fracture mechanical properties of the material significantly. In this work, the three-point-bending test is modelled by means of the finite element method and the dependences of fracture parameters on various material and geometrical parameters of the aggregate and the interfacial transition zone are studied. The results are discussed thoroughly
Comparative numerical analysis of obtained stress and displacement results from FEM programs - Robot Structural Analysis and ADINA in example of a steel footbridge subjected to the dead load
(Vysoká škola báňská - Technická univerzita Ostrava, 2017) Major, Maciej; Minda, Izabela; Kuliński, Krzysztof; Major, Izabela
In this paper the comparative analysis of obtained stress and displacements results from two different FEM programs – Robot Structural Analysis and ADINA was performed. As a subject of the analysis, the numerical model of the arch footbridge in steel construction was adopted.
Numerical static analysis of the curtain wall with light steel structure
(Vysoká škola báňská - Technická univerzita Ostrava, 2017) Major, Maciej; Kosiń, Mariusz; Major, Izabela
This paper presents a numerical analysis of the effect of wind on the curtain wall in a high building. Two types of curtain wall were adopted: made of thin-wall C sections with nominal dimensions and the section that takes into consideration lower limits specified by the manufacturer.
Inverse response surface method in reliability-based design
(Vysoká škola báňská - Technická univerzita Ostrava, 2017) Lehký, David; Šomodíková, Martina
The paper introduces an inverse response surface method utilized when performing reliabilitybased design optimization of time-consuming problems. Proposed procedure is based on a coupling of the adaptive response surface method and the artificial neural network-based inverse reliability method. The validity and accuracy of the method is tested using examples with explicit nonlinear limit state functions. Obtained results as well as important aspects of the method are discussed.
Elevated tank due to earthquake even
(Vysoká škola báňská - Technická univerzita Ostrava, 2017) Kotrasová, Kamila
Elevated reservoirs are mainly used for storing of variety water. During earthquake activity the fluid exerts impulsive and convective (sloshing) effects on the walls and bottom of tank. This paper provides theoretical background for analytical calculating of elevated water tank due to earthquake even and deals with simplified seismic design procedures for elevated tanks.
Permeability of the mixture of fine grained soil and fly ash from fluidized bed combustion
(Vysoká škola báňská - Technická univerzita Ostrava, 2017) Knapik, Karolina; Bzówka, Joanna
Based on known correlations permeability was calculated for the mixtures containing various proportions of selected FBC fly ash, Speswhite kaolin and lime. The influence of initial water content of the mixtures was also considered. The study was limited to the first four weeks of curing time. Results of calculations were discussed on the background of previously obtained observations for mixtures of tested materials.
Transforming the requirements for the modern architectonic design in terms of the placement of human remains
(Vysoká škola báňská - Technická univerzita Ostrava, 2017) Juračka, Ondřej; Frolíková Palánová, Klára
Behind every human death there is a story, unique to the human being, one that comes to a close after the official funeral ceremony. Generally, ‘close’ is the word essential for the bereaved and should govern the entire funeral process until the eventual placement of the remains. Today, a traditional funeral ceremony is losing its importance; it has either transformed itself or ceased to exist. The consequence of these changes involves new construction types of structures or transformation of existing crematoria and ceremony halls that are part of the funeral traditions in the Czech Republic. All this began with the influence of secularisation of society in the first half of the 20th century intensified through the dictate of the political regimen in the then Czechoslovakia after 1948. The period saw a suppression of all church activities, this including the funeral industry, when the state’s objective was to take a full control of everything. It resulted in large-scale construction of funeral halls and crematoria. This pushed cremation to the current 80% or so out of the total number of funerals. Following 1989, however, the society found itself in a vacuum through another change in the system. Due to this, funeral halls lost their initial ideological substantiation. The consequences include a search for new forms and the transformation of the ceremony which moves to the area in front of the cremation chamber or even to the very site of placement. This however requires a construction of new structures and sites for storing the ash. The aim is to find the best possible way of handling human remains while creating a cemetery setting that is observed (bereaved) friendly and enables to continue burials in the current necropolis sites.
Application of the current knowledge from research and development of the burial methods and their impact on designing or transforming contemporary cemeteries in the Czech republic
(Vysoká škola báňská - Technická univerzita Ostrava, 2017) Frolíková Palánová, Klára; Juračka, Ondřej; Černá, Barbora; Dubovský, Lukáš; Nahodilová, Šárka
Considerable transformation of the burial method at the turn of the 19th and the 20th centuries is apparent from the existing results of research in the developments of burial and funeral architecture, when after centuries controlled by the church – due to social and political changes – gradual secularisation of the society and subsequent desacralisation of funeral rituals started appearing. This phenomenon, as well as other aspects (e.g. Josephine reforms in 1782) brought about a change in the approach to newly established cemeteries but also the necessity to define areas for new burial methods and constructing new building types of funeral architecture. The position of necropolis is also changing as the society understands it, and its inclusion not only in the organism of towns but also in everyday life of town and municipality citizens. Thus, not only new but mainly original cemeteries are searching for their new position in the society. Studio papers try to react to this situation written by students of the master degree of the specialisation Architecture and civil engineering at the Faculty of Civil Engineering at the VŠB - Technical University in Ostrava, led by prof. Ing. arch. Petr Hrůša, doc. Ing. Martina Peřinková, Ph.D. and Ing. arch. Klára Frolíková Palánová, Ph.D. Students try to view necropolis in an innovative way and give them a new dimension to succeed and become adequate public or semi-public space of cities and municipalities. The contribution represents starting points of possible solutions on case studies, such as transformation of a cemetery in Ostrava on the Hulváky Hill, the design of establishing a new cemetery in open space near the municipality of Velichovky, including the design of a funeral hall, situating a new urn grove in the place of a former cemetery – the current park – a part of which is the design of a new crematorium in Nový Jičín and extension of possibilities for placement of ashes and designs supporting the development of funeral tourism in the Olšany Cemeteries in Prague.
Mutual comparison between the two computational models of interaction system vehicle-pavement
(Vysoká škola báňská - Technická univerzita Ostrava, 2017) Valašková, Veronika; Melcer, Jozef
Dynamic interaction between vehicle and pavement is a current problem which is solving in many workplaces around the world. This article is focused on the interaction model creation and principles of the solution for two numerical models. Numerical models of the interaction system vehicle-pavement were constructed in the computer software ADINA, which is based on the Finite Element Method.

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