Meri Cvetkovska

Meri Cvetkovska
Ss. Cyril and Methodius University in Skopje · Faculty of Civil Engineering

PhD

About

80
Publications
25,091
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236
Citations
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September 1985 - November 2015
Ss. Cyril and Methodius University in Skopje
Position
  • Professor

Publications

Publications (80)
Conference Paper
Full-text available
The Modernist architecture is an important cultural heritage of the city of Skopje. The Modernist buildings are built in lack of thermal insulation materials and they have very poor thermal characteristics. In order to improve their energy efficiency, numerous of daily interventions are implemented, which degrade their authentic appearance. In this...
Conference Paper
Full-text available
The architecture of Modernism in Skopje represent an important cultural heritage of the city. Those buildings were built in lack of thermal insulation materials and have very poor thermal properties. In order to improve their energy efficiency and thermal comfort, numerous of inappropriate interventions are made daily. In this paper, a dynamic soft...
Conference Paper
In the last few decades, the use of timber-concrete composite (TCC) slabs has increased in practice. Self-tapping inclined screws in different arrangements are a vastly used connection solution due to their high mechanical properties. This paper presents the results from push-out tests of connection comprised of self-tapping axially loaded screws a...
Conference Paper
Fire is an incidental load on structures. Experience has shown that in the event of a fire, extremely high temperatures are developed, as a result of which very often a colapse of the tunnel bearing structure happens, usually caused by spalling of concrete. Road tunnel fires are usually caused by vehicles using the tunnel, but can also be caused by...
Article
Full-text available
Skopje has unique examples of modernist architecture that play a major role in creating the new identity of the city, which was completely lost after the earthquake in 1963. In the last decade, awareness has been raised that modernist buildings deserve to be protected as cultural monuments. On the other hand, concerning energy efficiency and sustai...
Article
The behavior of simply supported reinforced concrete slabs in fire conditions and the influence ofcertain parameters on their fire resistance is analysed in this paper. The influence of the slab span,concrete cover thickness and the type of reinforcement scheme are analysed. All slabs are exposedto standard fire ISO 834. The analyses are conducted...
Article
Full-text available
According to official fire statistics, chimney fires account for almost 20% of all fires that occur in family residential buildings every year in the Balkan region. The high temperature from the chimneys may have an influence on fire spreading to the wooden girders. The objective of the study was to gather and analyse data on timber structure fire...
Article
The present paper summarizes recent research on timber-concrete composite (TCC) systems exposed to fire conditions. Experimental work on these systems in fire conditions is not as extensive as in normal temperature conditions. Therefore, only a few types of TCC systems are covered herein. The secondary objective of this paper is to present the prin...
Conference Paper
In the last few decades, timber-concrete composite floors have been successfully used in retrofit and refurbishment of existing timber buildings, but also in new buildings. They are gaining more and more attention in the research community, but still they aren`t commonly used in practice. TCC floors have many advantages over timber floors and the s...
Article
Full-text available
Selection process of a construction contractor is highly important and successful implementation of a project and realization of sustainability are largely dependent on it. Computer programs - expert systems - may be used to help the employer or his consultants in the process of best tenderer selection. This paper presents a new expert system based...
Article
Full-text available
Resulting from the devastating earthquake in 1963, the housing stock of the capital city of Skopje was destroyed by 85%. Due to the crucial need for rapid construction of residential buildings in order to provide homes, more than 60% of the existing residential buildings in Skopje were built in the period between the 1963 and 1980. Today, many of t...
Conference Paper
p>This paper presents seismic fragility assessment of RC high rise-buildings in Montenegro. The key points of the procedure for obtaining the fragility curves are described by using algorithm, defined in this paper, and generally applicable to all types of RC high-rise buildings. The fragility curves are derived and log-normal cumulative distributi...
Conference Paper
Full-text available
Numerical modelling of structural fire performance is a powerful tool in assessing the behavior of structures subjected to extreme loading conditions. It is not a replacement for experimental testing. On the contrary, experimental studies are inevitable and essential part for performing verification and validation of proposed calculation models. Th...
Conference Paper
Full-text available
Resistance to an action of fire is an important factor for the safety and serviceability of timber structures as well as for their further application. Design of the mechanical resistance, due to the specified fire exposure is defined by the reduced cross-section method and the reduced properties method. In this paper, analysis of structural elemen...
Conference Paper
Full-text available
The aim of this research paper is to carry out an architectural and structural analysis of the residential buildings in a selected city quarter in Skopje, built after the earthquake, in lack of thermal insulation materials. A typical residential quarter was selected, because of its intensive construction of buildings after 1963. The analysis includ...
Article
Full-text available
Artificial neural networks, in interaction with fuzzy logic, genetic algorithms, and fuzzy neural networks, represent an example of a modern interdisciplinary field, especially when it comes to solving certain types of engineering problems that could not be solved using traditional modeling methods and statistical methods. They represent a modern t...
Article
Full-text available
Numerical approach using finite element method has been used to evaluate the behaviour of reinforced concrete frame structure subjected to fire. The structure is previously designed in accordance with Eurocode standards for the design of structures for earthquake resistance, for the ductility class M. Thermal and structural response are obtained us...
Article
Full-text available
Understanding the performance and the response of the frame structures in fire is of a particular importance for structural fire design. The specialized computer program SAFIR enables analysis of different types of structures, constructed with different structural materials. The options of program SAFIR are presented on eight different fire scenari...
Conference Paper
Full-text available
The aim of this research paper is to make an architectural-building analysis of residential buildings, built after the 1963 earthquake in Skopje, in the absence of thermal insulation materials. For the analysis, a typical residential quarter is selected, known as Karpos 3, because it is estimated that most of the buildings built after 1963, were bu...
Conference Paper
Full-text available
Earthquakes are often followed by a number of post-earthquake fires. Since Eurocode standards provide calculation methodology and material models depending on the individual type of analysis, to combine the effects of earthquake followed by fire, a sequentially coupled numerical analysis, considering the same material models should be applied. This...
Conference Paper
Full-text available
For structural fire design, understanding the performance of reinforced concrete frame structures in fire based on different fire scenarios is important. Eight different fire scenarios of standard fire exposure of a three bay two storey RC frame are analyzed and the results for the: fire resistance, internal forces and deformations are presented an...
Conference Paper
Full-text available
This research is focused on the fire resistance and the behavior of fire exposed reinforced concrete frame structure. The fire compartment was assumed to be one or two spans of same floor, or the whole floor. By varying the fire compartment position, twelve different fire scenarios were analyzed in order to determine the worst fire scenario that le...
Conference Paper
Full-text available
je анализирана пожарна отпорност средњег АБ стуба једне вишеспратнице, пројектованог према прописима ЕС2, и (још) важећим националним прописима за бетон и армирани бетон неких земаља бивше Југославије. Различити примењени коефицијенти сигурности за материјале и оптерећења, као и посебни услови пројектовања стубова према некадашњим ЈУС сеизмичким пр...
Conference Paper
Timber buildings are economical, energy efficient, renewable and sustainable but, by the opinion of many engineers, prone to burning and have low fire resistant. Nowadays, ensuring the fire safety of timber buildings is a requirement in the design codes and a necessity in the design process. For the required duration of fire exposure, the fire safe...
Article
Full-text available
The Eeuropean codes for building design contain requirements for the fire safety of buildings. But, in some non EU countries, as Serbia and other former Yugoslav republics, design of RC structures is still acoordint to the old JUS (national) standards, which do not incorporate any fire safety requirements. For that reason, this papaer presents the...
Article
The use of the neural-network-based approach, as an unconventional approach for solving complex civil engineering problems, has a huge significance in the modernization of the construction design processes. Worldwide studies show that artificial neural networks can be successfully used as prognostic model in different engineering fields, especially...
Presentation
Fire resistance numerical analysis of steel-concrete composite beams as function of the defined structural system are presented in this paper. Partially encased steel profile IPE is coupled with the reinforced concrete slab and two different structural systems are analysed: simply supported beam and continuous beam over two spans. In practice, as a...
Conference Paper
Fire resistance numerical analysis of steel-concrete composite beams as function of the defined structural system are presented in this paper. Partially encased steel profile IPE is coupled with the reinforced concrete slab and two different structural systems are analysed: simply supported beam and continuous beam over two spans. In practice, as a...
Conference Paper
Fire resistance numerical analysis of steel-concrete composite beams as function of the defined structural system are presented in this paper. Partially encased steel profile IPE is coupled with the reinforced concrete slab and two different structural systems are analysed: simply supported beam and continuous beam over two spans. In practice, as a...
Conference Paper
Full-text available
Understanding the performance and the response of the reinforced concrete frame structures in fires, depending on the fire scenario, is important for structural fire design. Four different fire scenarios of standard fire exposure in a three bay two storey RC frame are analyzed and the results for the: fire resistance, bending moments and deformatio...
Conference Paper
Understanding the performance and the response of the reinforced concrete frame structures in fires, depending on the fire scenario, is important for structural fire design. Four different fire scenarios of standard fire exposure in a three bay two storey RC frame are analyzed and the results for the: fire resistance, bending moments and deformatio...
Conference Paper
Full-text available
Summary: Eurocode normes provide basic guidelines for the analysis of reinforced concrete structures subjected to fire. To determine the behaviour of structure, an advanced calculation method must be applied, to comprehend nonlinear material properties and effects that occur during the course of fire. These include thermal and mechanical properties...
Conference Paper
Full-text available
This paper presents a nonlinear lateral torsional buckling analysis of a simply supported steel beam subjected to fire. Finite Element Analysis (FEA) software ANSYS Workbench is used to calculate the fire resistance of beams subjected to various levels of critical buckling load, followed by the standard ISO 834 fire. Initial imperfection is determi...
Conference Paper
Full-text available
This paper presents a nonlinear lateral torsional buckling analysis of a simply supported steel beam subjected to fire. Finite Element Analysis (FEA) software ANSYS Workbench is used to calculate the fire resistance of beams subjected to various levels of critical buckling load, followed by the standard ISO 834 fire. Initial imperfection is determi...
Article
Full-text available
This paper presents the numerically achieved results for the fire resistance of several types of floor structures which are mostly used in our residential and rural buildings and in same time fulfil the energy efficient criteria, as: semi-prefabricated reinforced concrete slabs system FERT and STIRODOM (with infill of extruded polystyrene -XPS), ti...
Article
Full-text available
The bearing capacity of the column cross section can be determined from the interaction diagram moment-axial force (M–N). Fire induced temperatures cause reduction of the load-bearing characteristics of the constitutive materials, steel and concrete, and this effect directly reflects on the reduction of the axial force and the bending moment that c...
Article
Full-text available
If experimental studies are difficult to conduct, the validation of results obtained using numerical procedures can be achieved through comparative analyses performed by different numerical model codes. In this paper, analysis of a simply supported steel beam subjected to fire is performed using open source software OpenSEES and a commercial softwa...
Article
Full-text available
An experimental tests performed on two series of sandwich panels, differed by the type of the matrix used for the composite face sheets, are presented in this paper. By applying a linear load in the middle of the span, these sandwich panels were subjected on three points bending test. The analysis was performed in order to evaluate the influence of...
Article
Full-text available
In this paper the Energy-plus house project, functioning under the climate conditions of Macedonia, was presented. On the basis of previous studies carried out for a single-family house, the concept of a fully non-volatile home using solar photovoltaic modules for the operation of the electrical equipment was designed according to "Passive house"....
Conference Paper
Full-text available
To determine the structural behaviour under fire conditions, it is necessary to determine the temperature field inside the elements for the complete duration of the fire. Heat transfer within the cross-section affects the physical and mechanical properties of materials which comprise it and, indirectly, the stress-strain distribution in the element...
Conference Paper
Full-text available
To determine the structural behavior under fire conditions, it is necessary to obtain the temperature field inside the elements for the complete duration of fire. Heat transfer within the cross-section affects the physical and mechanical properties of materials which comprise it and, indirectly, the stress-strain distribution in the elements. In th...
Article
The building orientation and the thickness of the thermal isolation of the building envelope are one of the factors affecting the achievement of the Passive House standard. Other important factors are the windows. For the windows the three basic parameters that influence the achievement of the Passive House standard are: the size of the windows in...
Article
Full-text available
The application of artificial neural networks for solving complex civil engineering problems is of huge importance for the construction design process. They can be successfully used for prognostic modelling in different engineering fields, especially in those cases where some prior (numerical or experimental) analyses were already made. This paper...
Article
Full-text available
Using the concept of the artificial neural networks and the results of the performed numerical analyses as input parameters, the prediction model for defining the fire resistance of RC columns incorporated in walls and exposed to standard fire from one side, has been made. A short description of the numerical analyses of columns exposed to standard...
Article
Full-text available
INTERACTION DIAGRAMS FOR COMPOSITE COLUMNS EXPOSED TO FIRE Summary: The bearing capacity of the cross section of composite column in fire conditions through changes in the interaction diagram "bending moment-axialforce" were analyzed in this paper. The M-N interaction diagram presents the relationship between the intensities of the bending moment...
Article
Full-text available
The article evaluates the possibility of using solar energy for power supply of the historic buildings and structures in accordance with the current Protection of Cultural Heritage legislation of Monte- negro. The article puts forward the options for architectural incorporation of solar power systems into the appearance of historic buildings and st...
Article
Full-text available
An artificial neural network prediction model for fire resistance of centrically loaded composite columns exposed to fire from all sides is presented in this paper Three different types of composite columns, as: totally encased, partially encased and hollow steel sections filled with concrete, as well as ordinary RC columns were analyzed by using t...
Article
Full-text available
Fire following an earthquake is an important factor causing damage to buildings and life-line structures. Therefore, besides satisfying structural design requirements for normal loads, such as dead and live loads including the seismic hazard, buildings should also be designed to withstand the fire following earthquakes for a certain minimum duratio...
Article
Full-text available
The non uniform temperature fields in the cross section of the structural elements exposed to fire cause thermal dilatations which induce internal forces. In same time temperature changes cause longitudinal elongations and if these elongations are restricted, additional axial stresses will be induced. In this case the various support conditions can...
Article
Full-text available
The prediction model used for defining fire resistance of reinforced concrete columns exposed to standard fire from all four sides is presented in the paper. The proposed model relies on the concept of artificial neural networks, in which numerical analysis results are used as input parameters. A brief description of the modelling process is given,...
Article
Full-text available
The prediction model used for defining fire resistance of reinforced concrete columns exposed to standard fire from all four sides is presented in the paper. The proposed model relies on the concept of artificial neural networks, in which numerical analysis results are used as input parameters. A brief description of the modelling process is given,...
Article
This paper presents performed experimental tests of two series sandwich panels with composite face sheets differed by the type of the used matrix. Sandwich panels in the experimental tests were subjected on three points bending by linear load in the middle of their span. The analysis was performed in order to evaluate the influence of the matrix ty...
Article
Full-text available
Improper execution of bonding of FRP plates to the RC beam can result into appearance of zones where the bond is substantially weaker, and air pockets are present. This paper presents an attempt to model the weak bond zone and its influence on the global response of the externally CFRP strengthened RC beam. A numerical displacement-based fibber mod...
Article
Full-text available
Fibber reinforced polymers as bearing materials for civil engineering structures are subject of investigation in many scientific research programs. The excellent mechanical properties are the main reason for the increased interest for these materials. The concept of the composite materials itself, offers possibility of effective exploitation of the...