The list of national projects SAS

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Institute: Institute of Construction and Architecture

Modellintg of post-buckling behaviour and strength of thin-walled cold formed columns
Modelovanie pokritického pôsobenia tenkostenných za studena tvarovaných prvkov
Program: VEGA
Project leader: Ing. Kriváček Jozef CSc.
Duration: 1.1.2015 - 31.12.2018

Monitoring of the hygrothermal regime of the UNESCO object of St Jame's Church in Levoči and national herritage object St Martin's Cathedrale in Bratislava
Monitorovanie tepelno - vlhkostného režimu UNESCO pamiatky kostola sv. Jakuba v Levoči a národnej pamiatky katedrály sv. Martina v Bratislave
Program: VEGA
Project leader: Ing. Matiašovský Peter CSc.
Annotation:The project deals with the monitoring of hygrothermal regime of two monuments, namely an object national heritage, St. Martin’s Cathedral in Bratislava and an UNESCO monument, the St. James Church in Levoča. Monuments are located in different geographical positions. Both objects are built from materials having a porous structure. In the pores may be found the air, water wapour, water or ice, depending on environmental conditions. A change in thermal conductivity of the porous structure is utilized for monitoring.
Duration: 1.1.2016 - 31.12.2018

Multiphysical problems in functionallz graded materials plates
Multifyzikálne problémy v doskách z funkcionálne gradientných materiálov
Program: SRDA
Project leader: Prof. RNDr. Sládek Vladimír DrSc.
Annotation:The project deals with a unified theoretical and numerical treatment of the plate bending in interactions with various physical fields with including some possible chemical changes. Besides the classical theory of thin plates (Kirchhoff-Love theory, KLT), we shall consider also the first and third order shear deformation plate theories (FSDPT and TSDPT). Moreover, the materials of the plates are allowed to be functionally graded (FGM), hence the governing equations are partial differential equations with variable coefficients. According to the physical fields affecting the response of the plate, we shall deal with the following groups of coupling effects in bending problems for FGM plates: (i) dynamic effects, (ii) thermo-elastic coupling effects, (iii) electro-magneto-elastic coupling effects, (iv) thermo-electro-magneto-chemo-elastic coupling effects. A unified approach based on the variational principles of thermodynamics will be applied to derivation of governing equations and formulation of boundary conditions for considered multi-field problems. The study of coupling effects will be performed via computer simulations. For this purpose, advanced numerical techniques have to be developed. We plan to elaborate strong formulations with element-free approximations for spatial variations of field variables.
Duration: 1.7.2015 - 30.6.2019

Multiscale modelling of coupled fields in composite materials
Multiškálové modelovanie viazaných polí v kompozitných materiáloch
Program: SRDA
Project leader: Prof. Ing. Sládek Ján DrSc.
Annotation:Multiscale modeling is applied for composite materials to predict material properties or system behavior based on knowledge of the microstructure. It is very powerful computational tool for modeling of composite structures, where microstructure level cannot be applied for the whole structure due to size memory limits of available top computers. A new class of hybrid/mixed finite elements and scaled boundary finite element method are aimed to be developed for evaluation effective material properties on the representative volume element and for macro structure analyses. Both methods are applied to heat conduction problems, where microstructure effect should be considered in numerical analyses. Multiscale approach and Cowin & Nunziato model are used to analyze crack problems in composites with voids. The present project extends knowledge of crack behaviour in magneto-electro-elastic solids with voids. The influence of initial electron density and porosity on the stress intensity factor and electric displacement intensity factor for crack problems in electrically conducting piezoelectric composite with voids is investigated.
Duration: 1.7.2015 - 31.12.2018

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Neplánované mesto: architektonické a urbanistické koncepcie 20. storočia a ich priemet do mestskej štruktúry Bratislavy
Program: VEGA
Project leader: prof. Dr. Ing. arch. Moravčíková Henrieta
Duration: 1.1.2017 - 31.12.2019

Effectiveness of bended light guides under arbitrary sky conditions including broken cloud arrays
Optické vlastnosti zalomených svetlovodov za podmienok nehomogénnej oblačnosti s ľubovoľným pokrytím oblohy
Program: VEGA
Project leader: Mgr. Kocifaj Miroslav PhD.
Annotation:A curved surface as well as bends of hollow light guides both cause the light field is transformed in a complex way between a light exit surface and light entrance surface. Most of light-guide models fail in reproducing illuminance patterns under varying atmospheric conditions including cloud fields formed into non-static arrays. The effect of broken clouds on light field bellow the light guide will be the first time treated in its complexity in this project. We will qualify and quantify the effect of bends and their positions on the light-pipe effectiveness, while the theoretical and numerical results will be applied in predictions of illuminance distribution at a workplane. The targeted optical experiments in a local atmosphere are aimed i) to prove the solution concept as well as ii) to identify the effects of different cloud types on light guide optical properties. This should improve the accuracy of optical modeling in different localities accepting prevailing types of clouds and turbidity conditions.
Duration: 1.1.2016 - 31.12.2019

Coupled problems of thermal and electromechanical fields in advanced materials with porous microstructure
Viazané úlohy tepelných a elektromechanických polí v piezoelektrických materiáloch s poréznou mikroštruktúrou
Program: VEGA
Project leader: Prof. RNDr. Sládek Vladimír DrSc.
Annotation:Main goal of this project is to analyze coupling phenomena of thermal, electric and mechanical fields in porous piezoelectric media. Various coupling effects are possible between the physical fields leading to possible new applications. Characterization of these effects will be performed via computer simulations. Two material models for piezoelectric media will be considered – dielectric piezoelectric model and semiconductor piezoelectric model. Effect of porosity on thermal, electric and mechanical response will also be investigated. Besides the well-developed numerical methods a novel formulation of scaled boundary finite element method (SBFEM) will be considered for the numerical analyses. Advantages of this method can be effectively utilized to predict the behaviour of porous piezoelectric media in multilayer or 3D axisymmetric problems. Research results may be useful for the optimal design of advanced piezoelectric sensors and devices to enhance their measurement capabilities or structural integrity.
Duration: 1.1.2016 - 31.12.2019

Influence of repeated and long - term loading on interaction of parameters at reconstruction of reinforced concrete elements
Vplyv opakovaného a dlhodobého namáhania na parametre interakcie pri sanácií železobetónových prvkov
Program: VEGA
Project leader: Ing. Križma Martin PhD.
Duration: 1.1.2015 - 31.12.2018

Research on High Performance cementitious Composites under hydrothermal conditions for potential application in deep borewells
Výskum vysokohodnotných cementových kompozitov za hydrotermálnych podmienok pre potenciálne využitie v hĺbkových vrtoch
Program: SRDA
Project leader: Prof.Dr.Ing. Palou Martin-Tchingnabé
Duration: 1.7.2016 - 31.12.2020

High porous inorganic materials for thermal insulating applications
Vysokoporézne anorganické materiály pre tepelno-izolačné aplikácie
Program: VEGA
Project leader: Ing. Kuzielová Eva PhD.
Duration: 1.1.2015 - 31.12.2018

Generalized skyglow model and its application to retrieval of city emission function
Zovšeobecnený model jasu/žiary nočnej oblohy a jeho aplikácia pri získavaní emisnej funkcie miest
Program: SRDA
Project leader: Mgr. Kocifaj Miroslav PhD.
Annotation: For over a decade excessive night lighting has been recognized as a serious, wasteful problem that led to formulation of research priorities in fighting the intrusion of light pollution. Recently a special attention is paid to atmospheric optics and its environmental impacts. It is well recognized that clouds are the greatest modulators of downwelling diffuse radiation. Nevertheless, they remain the largest source of uncertainty in characterizing the light field under night-sky conditions. This is the first time a research project will treat these problems comprehensively by embracing statistically relevant cloud configurations. Concurrently, an interrelationship between radiance distributions and aerosol optics would be addressed theoretically, numerically, and experimentally following data gathering at a location surrounded by various sources of pollution, such as public transportation or factories in industrialized zones. These sources produce particles of different composition and morphology. Apart from clouds and aerosols, the temporal and spatial changes of a light field are determined by the bulk emission function of ground-based light sources (in this project City Emission Function is abbreviated CEF). However, for most of these sources it is becoming increasingly difficult to obtain the radiant intensity distribution as a function of zenith angle. Although knowledge of such emission patterns is extremely important for skyglow modelling, too little attention has been paid to the characterization of CEF. Therefore, following the radiative transfer principles we will develop a remote sensing technique for determining the mean emission function for a city.
Duration: 1.7.2015 - 31.12.2018

The total number of projects: 11