Faculty of Civil Engineering

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Methodology for risk assessment at existing hydrotechnical tunnels
(2021-10)
Gacevski Vasko
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Nedevska Ivona
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Lazarevska Marijana
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Zafirovski Zlatko
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ROAD INFLUENCE on THE ECOLOGICAL SAFETY OF THE ENVIRONMENT
(University of Montenegro, 2020)
Zafirovski Zlatko
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Ognjenovic Slobodan
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Nedevska Ivona
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Gacevski Vasko
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Methodology for Managing Railway Projects
(Springer, 2024)
Zafirovski Zlatko
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Nedevska Ivona
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Gacevski Vasko
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Ristov Riste
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Ognjenovic Slobodan
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Application of AHP Method for Multi-criteria Evaluation of Variants for New Railway Route
(Springer, 2024)
Nedevska Ivona
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Zafirovski Zlatko
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Ristov Riste
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Gacevski Vasko
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AN APPROACH FOR RAILWAY PROJECT MANAGEMENT
(Department of Civil Engineering and Geodesy, Faculty of Technical Sciences, Novi Sad, 2023-11)
Zafirovski Zlatko
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Nedevska Ivona
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Gacevski Vasko
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Ristov Riste
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Ognjenovic Slobodan
This paper aims to solve this problem, which has recently become more common in railway projects. The key is in a planned approach and organization from the beginning of the project, which the candidate considers by elaborating a Methodology for the construction of the site in the form of a document. This methodology solves all the above and helps lead the project from its beginning to the end with a positive result. The scope of the methodology for the construction of a facility includes several scientific disciplines directly related to the realization of the facility, such as law, economics, ecology, quality management, construction, etc. Therefore, it should cover all matters in these areas and provide solutions and courses of action at the beginning and in the development phase of the site to adapt to possible needs and to be finalized. The conclusion is that the application of such a Methodology for the construction of the site is necessary, or it could be freely said that it is mandatory.
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SUBBASE STABILIZATION WITH FLY ASH
(University of Niš, Serbia, 2023)
Zafirovski Zlatko
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Markovski Mite
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Ognjenovic Slobodan
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Gacevski Vasko
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Nedevska Ivona
Due to increased activities in civil engineering, and especially in the transport infrastructure, and thus an increase in the use of additional construction materials, innovative solutions are needed in finding alternative materials for the preservation of natural resources. One of the solutions for preserving natural building materials is the application of recycled material, which will also meet the required standards in civil engineering. In the transport infrastructure, there is a great opportunity for the use of recycled material, starting from the subbase, through the embankment and all the way to the superstructure and the concrete structures. One of the recycled materials that can be used in construction is fly ash. Fly ash is the most promising waste material when it comes to the wide range of applications in construction. Fly ash is obtained by burning coal in thermal power plants to produce electricity. Due to variations in the composition and characteristics of fly ash, several divisions and classifications have been created. One of the main classifications is according to the American standard ASTM C 618-05 where it is divided into class C and class F fly ash. This research aims to investigate the application of fly ash for subgrade stabilization and to determine the difference from a financial and environmental perspective for the application of fly ash compared to natural stone aggregate. The main research was carried out in connection with the increased use of natural stone aggregate, which appeared as a need during the rehabilitation of state road R1206, section Karpalak - Želino. Apart from the use of large quantities of stone aggregate for the stabilization of the subgrade, it also had an impact on the financial framework for the realization of the road project. In Macedonia, an analysis of the chemical composition of 4 samples of fly ash obtained in REC Bitola was carried out. From the obtained results, it can be concluded that it belongs to the classification of F-class fly ash and with the use of an activator (lime or cement) it can be used in the stabilization of the subgrade.
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HYDROTECHNICAL TUNNELS AT DAMS
(FACULTY OF CIVIL ENGINEERING AND ARCHITECTURE, UNIVERSITY OF NIŠ, 2023-09)
Zafirovski Zlatko
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Petkovska Marija
Performance of the construction work for each structure needs to be in accordance with a project documentation, for which a construction permit has been granted. Sometimes there’s a need for a change of basic design, not only for rough construction work, but for all construction works. In this paper hydrotechnical tunnels are mainly covered. First, there is a description of construction of one diversion tunnel, then the explanation of construction of two hydrotechnical tunnels from dams with accumulation, these dams are still being built in North Macedonia. The main part of this paper thesis is comparison between the changes in the construction work and the design of the tunnels.
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CLASSIFICATION OF RAILWAY SUPERSTRUCTURE RECONSTRUCTION METHODS
(FACULTY OF CIVIL ENGINEERING AND ARCHITECTURE, UNIVERSITY OF NIŠ, 2023-09)
Dimitrijevic Jelena
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Zafirovski Zlatko
The concept of railway reconstruction represents a form of corrective maintenance when regular continuous maintenance cannot restore the railway to a functional condition. Renovation is most often focused on the elements of superstructure such as ballast, sleepers, fastening system and rails. In the circumstance that the substructure additionally has to be repaired, all related operations are transformed into preparatory operations and take precedence over all procedures involving the restoration of the superstructure. The chosen method of construction has a direct impact on the quality of construction and the efficiency of operations. The required quality is directly related to the category of railway being built, with higher requirements as the railway ranks higher and has higher projected speed. Aside from the required quality and efficiency of construction, the chosen method is also influenced by the available space for maneuvering the machinery. The paper provides a basic classification of methods for restoring railway superstructures, with specific references to the positive and negative aspects of each method.
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CONTEMPORARY METHODS FOR SOIL AND WATER PROTECTION FROM THE IMPACT OF RAILWAY TRAFFIC
(University of Niš, Serbia, 2023-03)
Dimitrijević Jelena
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Bonić Zoran
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Milićević Dragan
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Zafirovski Zlatko
One of the basic assignments of modern society is preserving the quality of freshwater resources, especially drinking water. Line facilities potentially pose a higher risk to the environment due to the large length of the extension and the diversity of the environment they may affect. Storm water drained from railway could pollute the surrounding land besides railway track. Based on the data from available research, it has been determined that heavy metals (iron, copper, zinc, manganese and chromium), polycyclic aromatic hydrocarbons (PAHs) and herbicides stand out in significant quantities from substances hazardous to the environment. This paper proposes the solutions using some self-sustainable techniques, based on the analysis railway drainage needs. The proposals that have been made refer to the open-air railway and railway station.
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Parametric Study of Additional Temperature Stresses in Continuously Welded Rails on Steel Truss Railway Bridges
(Buildings 2023 - MDPI, 2023-09)
Nikola Mirkovic
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Marija Nefovska-Danilovic
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Maja Ahac
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Stjepan Lakušic
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Uroš Mirkovic
Additional temperature stresses in continuously welded rails (CWRs) are caused by track/bridge interaction (TBI) due to thermal actions. Exceeding permissible stresses in CWRs on the bridge can lead to track buckling or rail cracking, compromising the safety of railway traffic. The main aim of the conducted study is to determine the effects of the key parameters such as rail cross-sectional area, track longitudinal resistance, bridge expansion length, and longitudinal stiffness of the fixed bridge support on the reduction of additional temperature stresses in CWRs on steel truss railway bridges. To quantify the effects of these parameters, two steel railway bridges with CWRs and the maximum expansion lengths according to UIC Code 774-3 were analyzed: (1) simply supported truss bridge with expansion length of 60 m and (2) continuous truss bridge with expansion lengths of 2 × 60 m. According to the obtained results, the track longitudinal resistance had the most significant impact on additional temperature stresses in CWRs, leading to their reduction of up to 72%. The bridge expansion length and the rail cross-sectional area led to reductions of up to 25% and up to 18%, respectively. Considering the deformation criteria of TBI, the longitudinal stiffness of the fixed bridge support had a minor effect on the reduction of additional temperature stresses in CWRs.

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