Lazarevska, Marijana
Preferred name
Lazarevska, Marijana
Official Name
Lazarevska, Marijana
Main Affiliation
Email
marijana@gf.ukim.edu.mk
31 results
Now showing 1 - 10 of 31
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Item type:Publication, Cultural heritage as driver for sustainable growth - Project "ROCK"(MASE - Macedonian Association of Structural Engineers, 2017-10); ; ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, INFLUENCE OF THE COMPRESSIVE STRENGTH OF THE CONCRETE ON CFRP STRENGTHENED RC BEAM(Drustvo gradjevinskih konstruktera Srbije, 2016-09); ; A large number of existing RC structures, whether they have been built of concrete with usual compressive strength or of concrete with high compressive properties, exhibit non adequate performance in terms of diminished bearing capacity and there is a need of post strengthening during their service life. This paper presents numerical analysis of the influence of the compressive strength of the concrete on the performance of the CFRP strengthened RC beam. Analysis is performed for two characteristic cases: when the bond between concrete and external reinforcement is continuous along the length of the beam and when the bond is improper executed creating discontinuity zone between RC and CFRP plate. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Fire scenario influence on fire resistance of reinforced concrete frame structure(Elsevier BV, 2018); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, POST EARTHQUAKE FIRE RESISTANCE OF RC FRAME(2017-01); ; ; Stevanovic, BoskoFire 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 earthquake for a certain minimum duration as required for a desired level of performance. Calculating structural response to fire after earthquake is a few step process: modeling the structure including nonlinear analysis options; choice for earthquake analysis scenario; seismic nonlinear analysis: pushover or dynamic time history; fire hazards analysis to identify all possible fire scenarios; thermal analysis to calculate temperature history in each member; structural analysis to determine forces, stresses and deformations to estimate whether local or global collapse would occur during any of the fire hazard scenarios. To evaluate the seismic damage in a structure, first, the seismic hazard level is determined from the seismic hazard spectrum for the given site, followed by the selection of appropriate ground motion records and structural analysis. The seismic excitation induces damage and lateral deformation provoking additional stresses in the frame due to the moment caused by the P-D effect. Structural members and joints are also weakened by the cyclic inelastic deformation, causing stiffness and strength degradation. Once the earthquake-induced damage in the structure is determined, the damaged structure is subjected to a post earthquake fire (PEF) scenario, which involves fire hazard analysis to determine the time history of fire growth and spread and stress and collapse analysis of the structure but also to analyze no-collapse conditions and cooling after fire. The behavior of a particular reinforced concrete structure that was fire exposed after seismic action is presented in this paper. The seismic response of the structure is evaluated using a pushover analysis, while the displacement demand under the corresponding seismic event is determined using the recommendations implemented in Eurocode 8. The earthquake-induced damage in the structure is determined and, as next step, the structure is exposed to Standard fire ISO 834. For that purpose the program FIRE, based on FEM, is used. The program FIRE carries out the nonlinear transient heat flow analysis and nonlinear stress-strain response associated with fire. The solution technique used in FIRE is a finite element method coupled with time step integration. The computer modulus FIRE-T solves the governing differential equation of heat transfer in conduction. The response of a reinforced concrete elements and plane frame structures exposed to fire is predicted by modulus FIRE-S. This modulus accounts for: dimensional changes caused by temperature differences, changes in mechanical properties of materials with changes in temperature, degradation of sections by cracking and/or crushing and acceleration of shrinkage and creep with an increase of temperature. Pushover analysis, representing dynamic effects of an earthquake via static nonlinear procedure, is incorporated in the program as an option that precedes the postearthquake fire analysis. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, - Some of the metrics are blocked by yourconsent settings
Item type:Publication, An artificial neural network prediction model for fire resistance of composite columns(Centre for Evaluation in Education and Science (CEON/CEES), 2014); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Influence of the type of reinforcement on the behavior of FRP materials at indoor and elevated temperatures(Fakultet tehnickih nauka, Novi Sad, 2015-11); ; Increasing interest about composite materials and their use in the field of civil engineering offers possibility for development of new innovative materials, which will be used as constructive elements. the concept of the composite materials itself, offers possibility of effective exploitation of mechanical characteristics of the separate components till their limit, even in the design process. Mechanical characteristics of each composite material depend on its components. In this paper experiments of different series composite materials differed by the type of used reinforcement are presented. Experimentally observed mechanical characteristics of different types of composite materials are discussed in dependence on used reinforcement at indoor and elevated temperature. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Fire scenario influence on the fire resistance and the behavior of RC frame structure(University of Novi Sad, Faculty of Technical Sciences; Higher Education Technical School of Professional Studies, 2017-08-15); ; ; Mircevska, VioletaUnderstanding the performance and the response of the frame structures in fire is of 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 scenarios of standards fire exposure of three bay two story RC frame. The results for the: temperature distribution within the structural elements, fire resistance of the whole structure, bending moments and deformations of elements are presented and discussed. The worst fire scenario of the frame is defined. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Fire scenario influence on the fire resistance of RC frame structure(2017-10-29); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Neural Network Prognostic Model for Predicting the Fire Resistance of Eccentrically Loaded RC Columns(Trans Tech Publications, 2014-09); ; ; Milanovic, Milivoje<jats:p>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 fire ISO 834, conducted by the computer software FIRE are presented in this paper. The software is capable of predicting the nonlinear response of reinforced concrete elements and plane frame structures subjected to fire loading, carrying out the nonlinear transient heat flow analysis and nonlinear stress-strain response associated with fire.</jats:p>