Institute of Earthquake Engineering and Engineering Seismology
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Item type:Publication, Решенија за ограничување од облогата и хидродинамичка стабилност на јаловишна брана(Сплит- ХрватскФакултет за Градежништво Архитектура и Геодезија; Матице Хрватске 15, HR-21000 Сплит, 2023-12-12)Mircevska VioletaThe study investigates the impact of reservoir lining on the hydrodynamic stability of a tailings dam. A 3D coupled fluid-solid finite element model was used for detailed seepage analyses based on conventional flow-net and steady seepage conditions. Pore pressure, stationary seepage velocities, static liquefaction and the ratio between manifested and critical hydraulic gradients were predicted under three different lining conditions. The highest potential for internal erosion and heave was observed in the lined reservoir and starter dam scenario. Although there are environmental benefits, the incorporation of liners in dam design requires a comprehensive engineering assessment of the negative hydrodynamic effects. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Influence of railway induced vibrations on structures and humans in urban areas(Croatian Society of Civil Engineers - HSGI, 2022-10-10)Naumovski Nikola, Hristovski Viktor, Krstevska LidijaRail traffic is a significant source of vibration that can affect the quality of life of people living near busy railways. The paper proposes an integrated methodology for analysis of the impact of vibrations from railway traffic on people and buildings and measures for reduction of their effect. The research has grasped in-situ measurements and numerical modelling of railway traffic-induced vibrations. The proposed integrated methodological approach is specifically implemented on the section of the active railway line Kumanovo-Deljadrovce, N. Macedonia. The knowledge gained in this research is intended to represent a good basis for defining national standards for this increasingly relevant issue. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Quasi-static tests on RC building columns strengthened with CFRP(Croatian Association of Civil Engineers, 2021-09)Golubka Nechevska-Cvetanovska, Artur Roshi, Julijana Bojadjieva, Jordan Bojadjiev, Zoran Trajcevski<jats:p>To explore the possibilities and benefits of using CFRP (Carbon Fibre Reinforced Polymers) in strengthening RC building columns, quasi-static tests (compression and bending) were carried out at the Institute of Earthquake Engineering and Engineering Seismology - IZIIS, Skopje by variation of concrete class, reinforcement percentage and by using various strengthening technologies. Some recommendations and outcomes regarding the approach, technology and conclusions drawn from practical application of these materials, are given. Based on the analysis of values obtained from nonlinear static and nonlinear time history analyses, it can be concluded that the ductility capacity for displacement of model strengthened with CFRP is greater by 60 %, while its strength capacity is greater by 7.7 % when compared to the values obtained for the model without CFRP. It can generally be concluded that CFRP systems are a very practical tool for strengthening and retrofitting concrete structures, as they can extensively improve flexural strengthening, shear strengthening, column confinement, and ductility.</jats:p> - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Analysis of exponent K based on “SHARE” project data and its implications on importance factors of EN 1998–1(Springer Science and Business Media LLC, 2022-02-08) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Genealogy of development and codification of Yugoslavian earthquake resistant design(Springer Science and Business Media LLC, 2022-08-30) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Deformable polyurethane joints and fibre grids for resilient seismic performance of reinforced concrete frames with orthoblock brick infills(2020-11-30)Rousakis, T. and Ilki, A. and Kwiecien, A. and Viskovic, A. and Gams, M. and Triller, P. and Ghiassi, B. and Benedetti, A. and Rakicevic, Z. and Colla, C. and Halici, O.F. and Zaj?c, B. and Hojdys, ?. and Krajewski, P. and Rizzo, F. and Vanian, V. and Sapalidis, A. and Papadouli, E. and Bogdanovic, A.The behaviour of reinforced concrete frames with masonry wall infills is influenced a lot by the stiffness and strength difference between the frame and the infill, causing early detrimental damage to the infill or to the critical concrete columns. The paper reports the results from shake table seismic tests on a full-scale reinforced concrete (RC) frame building with modified hollow clay block (orthoblock brick) infill walls, within INMASPOL SERA Horizon 2020 project. The building received innovative resilient protection using Polyurethane Flexible Joints (PUFJs) made of polyurethane resin (PU), applied at the frame-infill interface in different schemes. Further, PUs were used for bonding of glass fibre grids to the weak masonry substrate to form Fibre Reinforced Polyurethanes (FRPUs) as an emergency repair intervention. The test results showed enhancement in the in-plane and out-of-plane infill performance under seismic excitations. The results confirmed remarkable delay of significant infill damages at very high RC frame inter-story drifts as a consequence of the use of PUFJs. Further, the PUFJ protection enabled the resilient repair of the infill even after very high inter-story drift of the structure up to 3.7%. The applied glass FRPU system efficiently protected the damaged infills against collapse under out-of-plane excitation while they restored large part of their in-plane stiffness. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A hybrid seismic isolation system toward more resilient structures: Shaking table experiment and fragility analysis(Elsevier BV, 2021-06) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Ambient Vibration Testing and Field Investigations of Two Historical Buildings in Europe(Tech Science Press, Structural Durability & Health Monitoring, 2020-06-10)Ehsan Noroozinejad Farsangi, Aleksandra Bogdanovic, Zoran Rakicevic, Angela Poposka and Marta StojmanovskaIn this study, the methodology and results of ambient vibration-based investigations of the historical Tash Mosque in Kosovo and a 3-story historical building in Bulgaria are presented. The investigations include full-scale in situ testing of both structures due to ambient vibrations induced by micro-seismic, wind, traffic, and other human activities. To this aim, Ranger seismometers and Kinemetric products were used. Measurements were performed in both horizontal directions in several points along the structures’ height utilizing a high-speed data acquisition device. All recorded data have been analyzed and processed by the software developed at IZIIS, and then the processed data were used as input for modal analysis. The basic assumption is that the excitation can be considered as a stationary random process to have a relatively flat spectrum. The paper clearly describes the procedure used for investigations and presents the dynamic properties of the whole structures. The investigated structures are both historical buildings and defined as architectural heritage and the outcome of this study including the natural vibration frequencies and mode shapes) can be very beneficial for the verification stage of the analytical/numerical models for future retrofitting/ rehabilitation schemes. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Influence of soil-structure interaction (SSI) on optimal design of passive damping devices(Structures,, 2020-12)Ersin Aydin, Baki Ozturk, Aleksandra Bogdanovic, Ehsan Noroozinejad Farsangi,Recently, the interest in research for optimization of viscous dampers in design of buildings has been increasing. In this study, the effect of soil-structure interaction has been taken into account for the purpose of optimal design of viscous dampers. A damper optimization method based on a target damping ratio and interstorey drift ratio found in literature has been adapted for a building structure model considering different types of sandy soils. While passive constraints have been taken as upper and lower limits of each damper, active constraints have been considered as a target damping ratio in terms of damping coefficients. The proposed algorithm includes time history analyses that test the designer’s optimal design. Interstorey drift ratios under design earthquakes have been checked at each design step. The first and second mode responses have been considered separately. According to the results obtained from this study, the negative impact of sandy soils on the dynamic behavior of superstructures can be overcome by optimal placement of dampers in buildings. The results of the analyses have shown that soil effects should be taken into account in solving damper optimization problems. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, The need of integrated renovation of the existing building stock in North Macedonia(Informa UK Limited, 2020-08-06);