Řada stavební. 2016, roč. 16 / Civil Engineering Series. 2016, vol. 16

Permanent URI for this collectionhttp://hdl.handle.net/10084/112034

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Now showing 1 - 20 out of 33 results

Application of facility management in brownfield conversion
(Vysoká škola báňská - Technická univerzita Ostrava, 2016) Wernerová, Eva; Kuda, František; Endel, Stanislav
The subject of this paper covers two issues, namely the issue of brownfields and their conversion and the issue of Facility Management, which offers the possibility of applying its principles and tools for extending the benefit of the construction works as a tool for active access to care for the property. This paper aims to link these two topics and to identify the possibility of applying Facility Management in the conversation process of revitalization of brownfields so that subsequent commissioning eliminates the risk of future costly operation and relapse of the revitalized building into the category of brownfields.
Adaptive architecture and the prevention of infections in hospitals
(Vysoká škola báňská - Technická univerzita Ostrava, 2016) Tran, Van Khai
Researches has shown that climate change may spark global epidemics. The objectives of hospital design consistent with a high standard of sustainable architecture must not only be the tropicalization of buildings but also a system to confront the impact of infectious diseases which arise from climate change. Infection control is the discipline concerned with preventing nosocomial or healthcare-associated infection. Infection control addresses factors related to the spread of infections within the hospital building, including prevention, monitoring and management measures. As the application of new technologies such as the Heating, ventilation and air conditioning system (HVAC) with high-efficiency particulate arrestance (HEPA) has application range within stamina, the study suggests the need to adopt an integrated adaptive hospital design strategy to prevent infection.
The pulley element
(Vysoká škola báňská - Technická univerzita Ostrava, 2016) Štekbauer, Hynek
The pulley is used in a number of structures for the mechanical advantage it gives. This paper presents an approach for the calculation of a pulley-cable system using a special pulley element in the finite element method. The Lagrange Multiplier method and Penalty method are used to define the pulley element, as described in this paper. Both approaches are easy to implement in general FEM codes.
Experimental and numerical investigations of the influence of real cracks on chloride ingress in concrete
(Vysoká škola báňská - Technická univerzita Ostrava, 2016) Sosdean, Corina; Marsavina, Liviu; De Schutter, Geert
Experimental and numerical results of a chloride ingress study conducted on samples drilled from different locations of a reinforced concrete slab, previously loaded until failure, are presented. The experimental part was carried on following the NT Build 492 standard for the non-steady state migration test, then a 3D model was developed using the Abaqus/Standard software based on the FEM in order to simulate chloride ingress in both uncracked and cracked concrete.
X-Ray investigation and strength measurement of steel fibre reinforced self-compacting concrete beams
(Vysoká škola báňská - Technická univerzita Ostrava, 2016) Ponikiewski, Tomasz; Gołaszewski, Jacek
The paper presents a study on self-compacting concrete with two types of steel fibres. Under consideration was the effect the method of forming of beam elements has on the distribution of steel fibres. Formed we beams of dimensions 120×15×15 cm and 180×15×15 cm . The self-compacting mixture contained steel fibres of varying lengths (35 and 50 mm) and varying levels of their volume ratio in the mix (0.5% - 1.0% - 1.5%).
Numerical and experimental models of the thermally stratified boundary layer
(Vysoká škola báňská - Technická univerzita Ostrava, 2016) Michalcová, Vladimíra; Lausová, Lenka; Skotnicová, Iveta; Pospíšil, Stanislav
The article describes a change of selected turbulent variables in the surroundings of a flow around thermally loaded object. The problem is solved numerically in the software Ansys Fluent using a Transition SST model that is able to take into account the difference between high and low turbulence at the interface between the wake behind an obstacle and the free stream. The results are verified with experimental measurements in the wind tunnel.
Influence of damping on FRF of vehicle computing model
(Vysoká škola báňská - Technická univerzita Ostrava, 2016) Melcer, Jozef
Frequency Response Function (FRF) characterizes the response of dynamic system in frequency domain. Its shape is dependent on the property of analyzed system, especially on damping. The damping neglecting during the calculation of frequency response causes that the Power Response Factors have the character of discrete spectral lines at points of natural frequencies of the vehicle computing model.
Design of experiment using simulation of a discrete dynamical system
(Vysoká škola báňská - Technická univerzita Ostrava, 2016) Mašek, Jan; Frantík, Petr; Vořechovský, Miroslav
The topic of the presented paper is a promising approach to achieve optimal Design of Experi- ment (DoE), i.e. spreading of points within a design domain, using a simulation of a discrete dynamical system of interacting particles within an n-dimensional design space. The system of mutually repelling particles represents a physical analogy of the Audze-Eglājs (AE) optimization criterion and its period- ical modification (PAE), respectively. The paper compares the performance of two approaches to im- plementation: a single-thread process using the JAVA language environment and a massively parallel solution employing the nVidia CUDA platform.
Reliability assessment of quick closing valves in hydroeletric power plant
(Vysoká škola báňská - Technická univerzita Ostrava, 2016) Marková, Jana; Jung, Karel
The assessment of existing components of power producing facilities is based on probabilistic methods of the theory of reliability provided in Eurocodes and ISO standards. An example of quick- closing valves in a selected hydroelectric power plant indicates the assessment of reliability and the prediction of the remaining working life of a structural component for the considered model of corrosion.
Numerical analysis of dynamic force acting perpendicularly on a wall made of concrete blocks with rubber inserts
(Vysoká škola báňská - Technická univerzita Ostrava, 2016) Major, Maciej; Major, Izabela
In this paper numerical analysis considering the influence of dynamical force acting on wall made of concrete blocks with rubber inserts is presented. By examining the stress values on front and back surface of the analysed wall structure model, the effectiveness of proposed solution can be measured comparing to the wall made of concrete blocks without rubber inserts. Complete numerical analysis was performed in ADINA program.
Discrete model for concrete fracture: numerical study of dynamic response
(Vysoká škola báňská - Technická univerzita Ostrava, 2016) Květoň, Josef; Eliáš, Jan
The contribution presents simulations on concrete specimens. The discrete meso-scale particlemodel with random geometry based on Voronoi tessellation is used. The model was enhanced with dynamic solver based on implicit Newmark method. Model is tested on cantilever beam loaded by a force at the free end to verify the ability of the model to simulate the dynamic behavior of a simple linear elastic material. Results computed with different time discretization and model settings are compared. The behavior of the model in nonlinear regime is investigated on concrete specimens loaded at different displacement rates. The constitutive law used within this contribution is insensitive to strain rate.
Effect of the length of traffic flow records on the estimate of a bridge service life
(Vysoká škola báňská - Technická univerzita Ostrava, 2016) Krejsa, Jan; Sýkora, Miroslav
The service life of bridges is significantly affected by fatigue of used material induced by heavy vehicles. Therefore, precise determination of the vehicle weight is of crucial importance for the calculation of fatigue damage and the prediction of the bridge serviceability. This paper investigates accuracy of the determination of fatigue depending on the length of traffic flow recording. The presented data were obtained from the measurements carried out on a bridge of the Prague Highway Ring. The analysis reveals that the optimal length of traffic recording is about 30 days.
CFD simulation of air flow over an object with gable roof, revised with Y+ approach
(Vysoká škola báňská - Technická univerzita Ostrava, 2016) Králik, Juraj
Aim of this contribution is to provide insight view into analysis focused on obtaining external pressure coefficients on isolated two storey low-rise building with 15° elevation gable roof using Computer Fluid Dynamics simulation and these are compared to values that offering Eurocodes. Final Volume Model consisting of polyhedral mesh will be used for analysis with two different turbulence models. Mesh was created with respect to y+ parameter, where desired value was below one which leads us to fine mesh type. Secondary aim of this contribution is to compare performance of selected turbulence models. For this purpose were chosen Detached Eddy Simulation and Large Eddy Simulation which are part of the Scale Resolving Simulation turbulence models.
Nonlinear analysis of the failure of nuclear hermetic reinforced concrete structure due to extreme pressure and temperature
(Vysoká škola báňská - Technická univerzita Ostrava, 2016) Králik, Juraj; Králik, Juraj; Klabník, Maroš
This paper describes the nonlinear analysis of the reinforced concrete hermetic containment under an accidental temperature. The scenario of the hard accident in NPP and the methodology of the calculation of the failure temperature using the safety assessment are presented. The experimental and project material properties are taken into account in the safety assessment.
Ground supported short fiber reinforced concrete industry plate
(Vysoká škola báňská - Technická univerzita Ostrava, 2016) Kormaníková, Eva
The present paper describes the elastic theory and Losberg Yield Line theory with plastic approach of solution. The finite element method for modeling of fiber reinforced concrete plates placed on Winkler foundation was used. There is presented Tsai and Pagano model within micromechanics of composite materials with short fibers. As the application problem it was used example of fiber-reinforced concrete industry plate. The strength obtained from elastic and plastic approach was compared and discussed in the conclusion of the paper.
Heat transfer in a concrete composite cross-section
(Vysoká škola báňská - Technická univerzita Ostrava, 2016) Klabník, Maroš; Králik, Juraj
The work is concerned with the spread of heat in 2D coupled cross section with respect to the material characteristics and boundary conditions of calculation. Heat transfer was simulated in the program ANSYS in time interval up to 180 minutes. Nine various models were created to investigate the rate of influence of the changes in thermal material characteristics such as the specific heat capacity coefficient and thermal conductivity, upon the course and difference of temperature in the concrete cross-section. The comparison of results obtained using non-linear and constant values of the variables in simulation was made, too.
Analysis of lamellar structures with application of generalized functions
(Vysoká škola báňská - Technická univerzita Ostrava, 2016) Kipiani, Gela; Botchorishvili, Nika
Theory of differential equations in respect of the functional area is based on the basic concepts on generalized functions and splines. There are some basic concepts related to the theory of generalized functions and their properties are considered in relation to the rod systems and lamellar structures. The application of generalized functions gives the possibility to effectively calculate step–variable stiffness lamellar structures. There are also widely applied structures, in that several in which a number of parallel load bearing layers are interconnected by discrete-elastic links. For analysis of system under study, such as design diagrams, there are applied discrete and discrete-continual models.
Snap-through of the very shallow shell with initial imperfection
(Vysoká škola báňská - Technická univerzita Ostrava, 2016) Havran, Jozef; Psotný, Martin
Elastic shallow shell of translation subjected to the external pressure is analysed in the paper numerically by FEM. Nonlinear equilibrium paths are calculated for the different boundary conditions. Special attention is paid to the influence of initial imperfection on the limit load level of fundamental load-displacement path of nonlinear analysis. ANSYS system was used for analysis, arc- length method was chosen for obtain fundamental load-displacement path of solution.
Stochastic sensitivity analysis of cylindrical shell
(Vysoká škola báňská - Technická univerzita Ostrava, 2016) Grzywiński, Maksym
The paper deals with some chosen aspects of stochastic sensitivity structural analysis and its application in the engineering practice. The main aim of the study is to provide the generalized stochastic perturbation technique based on classical Taylor expansion with a single random variable. The study is illustrated by numerical results concerning an industrial thin shell structure modeled as a 3-D structure.
Laser system for testing early shrinkage of concrete elements in conjuction with the deterioration of the setting time
(Vysoká škola báňská - Technická univerzita Ostrava, 2016) Gołaszewski, Jacek; Ponikiewski, Tomasz; Cygan, Grzegorz; Gołaszewska, Małgorzata
The paper presents a method for testing the shrinkage of concrete beams with dimensions of 10x10x50cm. Measurements followed from setting into the form until 24 hours after setting. It was used modified TLS system, which originally was meant for the determination of changes in the length of thin-mortar. Simultanously measured were the changes of speed propagation of sound waves by Vikasonic, what allows to specify the setting time of binders. It could be a base for determining the scratch resistance of the concrete in the first 24 hours after casting.

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