Popovski, Denis
Preferred name
Popovski, Denis
Official Name
Popovski, Denis
Main Affiliation
Email
popovski@gf.ukim.edu.mk
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Item type:Publication, Comparison of Code for Design and Analysis of Composite Columns(Macedonian Association of Structural Engineers (MASE), 2023); ; This paper presents the construction regulations and regulations for the design and analysis of coupled columns. Composite columns are composite materials made up of several components such as concrete, steel and reinforcement, while using the rationally positive aspects of concrete as a pressure load and having a part in increasing the fire resistance of the section and steel as reinforcement or a rigid core, which accept loads of pressure and tension also has a great role in increasing the fire resistance of the section and also with adhesion between concrete and steel in the section, a rational solution for the design of modern structures is possible. The trend of innovations in construction requires modern solutions, one of them is the coupled construction system, which also requires greater analysis. In terms of the practice of application and performance of coupled structures, due to the problem that is not sufficiently researched, the largest number of designers claim either reinforced concrete or steel sections in appropriate classical reinforced concrete or steel structural systems. Available literature and practical applications are very few. They are mostly studied in Eurocode 4, and their expressions and explanations are the basis of other regulations from Japan, China, Russia, USA, India, Australia, United Kingdom, Germany, Italy, Ethiopia, Canada, etc. which have an almost similar concept of analysis according to Eurocode 4. The paper shows comparisons of regulations and building regulations for the design of coupled columns as part of the coupled construction system with pictures, diagrams and empirical beams and shows the most applied concept of analysis of coupled columns as well as the simplified method of analysis according to Eurocode 4. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Comparison of Completely and Partially Concreted Composite Columns According to Eurocode 4(2023); ; The paper provides a review of the analysis of fully and partially concreted sections of coupled columns with a comparative analysis of the obtained results. The purpose of this paper is to perform an analysis of fully concreted composite columns with steel profile core and additional soft reinforcement and partially concreted steel profile columns and additional soft reinforcement. In the analysis, the same and similar cross-sections are taken to see how effective it is in carrying axial forces and biaxial bending for comparing fully coupled columns with partially coupled columns. The entire analysis is carried out according to Eurocode 4 and theoretical assumptions are introduced in the analysis and biaxial bending and shearing of the cross sections of the two types of coupled columns are calculated. The analyzed sections are examples from practice loaded with real loads. The materials of the spliced columns are rigid steel profiles with steel grades S235 – S460, concrete grades C20/25 – C50/60, soft reinforcement quality S460 and B500 with reinforcement percentages of 1-6% and an assumed fire-resistance scenario. from R30 – R240. Combinations of calculations for different brands of concrete, different qualities of steel and reinforcement for different cross-sections with percentages of reinforcement, as well as combinations of moment ratios and comparisons of cross-sections, have been made. From the given static influences, the cross section for combined pressure and biaxial action is determined and interaction N–M diagrams are determined along both axes with percentages of reinforcement shown as a final output that can be used in future simplified calculations. Results and conclusions were obtained from the comparison, with which one can see the differences of coupled columns of fully and partially coupled sections. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Analysis of second-order effects according to Eurocode 2(Macedonian Association of Structural Engineers (MASE), 2022); ; ; The Eurocode, as the current design code in our country, allows designing objects according to contemporary standards but also opens a great number of research topics. The focus of this paper will be the two simplified methods that Eurocode 2 offers for the calculation of the second-order effects, which are particularly important when designing construction elements with great height or with large longitudinal forces. The second-order moments will be calculated for columns by varying a larger number of factors that, less or more, influence the final results. Thereby, the two simplified methods in Eurocode 2, method of nominal stiffness and method of nominal curvature, will be applied and compared. The main goal is to determine how the change of some factors, like: effective length, concrete class, cross-section, stiffness of the elements which is connected with the cracks, affects the second-order moments calculated with the two methods. These analysеs will be conducted in 6 key studies for isolated columns. The key studies will determine the actual influence that the second-order moments have. From the calculations made with the two methods different results for the moments are obtained, but to a certain value, the results are with an insignificant difference. The reason why the method of nominal stiffness and the method of nominal curvature give different results will be explained and the point at which they give approximate results will be determined. In the conclusions, everything that has been determined within the analyses will be highlighted. Given that Eurocode 2 leaves the opportunity to choose the method of analysis of the second-order effects up to the country’s National Annex, with the analyses made a contribution to that decision was made, with a conclusion which method is more appropriate for calculating the second-order effects.