Institute of Earthquake Engineering and Engineering Seismology
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Item type:Publication, Performance of CFRP-confined concrete cylinder specimens - laboratory study(Croatian Association of Civil Engineers, 2022-03-28)Golubka Nechevska-Cvetanovska, Artur Roshi, Jordan Bojadjiev, Julijana Bojadjieva, Zoran Trajcevski<jats:p>The research presented in this paper focuses on the application of innovative materials for the repair and strengthening of RC columns of buildings in seismically active regions. The analytical and laboratory research for defining the compressive strength and elastic modulus of concrete cylinders confined with CFRP (Fibre Reinforced Polymers) was carried out at the Skopje-based Institute of Earthquake Engineering and Engineering Seismology – IZIIS in order to present the possibilities and benefits of using these materials. Selected results from laboratory testing of built-in materials, and some analytical results from the designed CFRP-confined RC columns for quasi static tests, are presented in this paper.</jats:p> - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Verification of a System for Sustainable Research on Earthquake-Induced Soil Liquefaction in 1-g Environments(MDPI AG, 2022-09-29) - 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, Effectiveness of tune mass damper in the reduction of the seismic response of the structure(2012-02-26)Rakicevic, Z.T. and Bogdanovic, A. and Jurukovski, D. and Nawrotzki, P.A shaking table testing of a 16.6 t five storey steel frame structure with and tuned mass damper (TMD) named as Tuned Mass Control System (TMCS) installed at the top has been carried out in the Dynamic Testing Laboratory at the Institute of Earthquake Engineering and Engineering Seismology (IZIIS) in Skopje, Republic of Macedonia. For estimation of the effectiveness of Tuned Mass Control System (TMCS) large number of shaking table experiments have been performed. Simulating different earthquake time histories on the model structure with and without TMCS it has been demonstrated that this system is capable to reduce the responses in order from 10% to more than 50% depending on the frequency content of the seismic input and the corresponding sensitivity of the structure. Given a high quality analytical model of a structure and a dynamic absorber, a series of variant analyses have been performed within the study to investigate the effect of the individual parameters and evaluate the efficiency of the dynamic absorber. The analyses have been performed to define the effect of the location of the absorber, also, upon the dynamic behaviour of the structure in the case the absorber is installed at the different level (storey) of the structure. Comparative analysis of the structure with TMCS having optimally tuned its mechanical properties versus structure that has TMCS having the same mechanical properties as tested specimen showed that the TMCS additionally improves the structural behaviour, depending on frequency content of earthquake excitation. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A European Association for the Control of Structures joint perspective. Recent studies in civil structural control across Europe(2014-03-12)Basu, B. and Bursi, O.S. and Casciati, F. and Casciati, S. and Del Grosso, A.E. and Domaneschi, M. and Faravelli, L. and Holnicki-Szulc, J. and Irschik, H. and Krommer, M. and Lepidi, M. and Martelli, A. and Ozturk, B. and Pozo, F. and Pujol, G. and Rakicevic, Z. and Rodellar, J.Structural control has been comprehensively studied over the world as a multidisciplinary research field. The present work is motivated by an attempt to give a common frame to the recent research and applications of structural control technology in civil engineering across Europe. They include novel passive dampers, functional materials and semi-active dampers, active control systems, and their performance investigations. Design methods for the vibrations reduction of buildings, bridges, and wind turbines are discussed with reference to case studies. Control algorithms and dimension reduction techniques are also studied. Adaptation strategies and techniques based on the potential offered by piezoelectricity are reviewed. Copyright © 2014 John Wiley & Sons, Ltd. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Shake table tests and numerical investigation of a resilient damping device for seismic response control of building structures(2019-08-25)Bogdanovic, A. and Rakicevic, Z. and Noroozinejad Farsangi, E.In this study, shake table tests of a multistory steel frame structure designed according to Eurocodes 3 and 8 with and without the newly developed prestressed viscous damper (PVD) have been carried out at the Institute of Earthquake Engineering and Engineering Seismology in Macedonia. An array of strong ground motion records has been applied to the reduced-scale test structure to assess the efficiency and seismic performance of the equipped building with PVDs. It has been revealed that with the implementation of this system, the structural responses were suppressed in the range of 10% to 70%. Series of sensitivity analyses have been performed within the study to investigate the effect of the individual parameters and evaluate the effectiveness of the proposed system. Besides the experimental investigations, extensive numerical simulations of the structure without PVDs versus structure with three different damper placements were performed in ANSYS nonlinear platform, and part of the results that are presented in this paper confirms the remarkable structural performance improvement when using this system. The results also exhibit that the developed finite element models are properly verified through the experimental results and have the capabilities to further investigate the proposed system. It is likely that the proposed control strategy can be used for practical implementations into full-scale buildings to improve the urban seismic resilience. - 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, Ambient Vibration Testings and Field Investigations of Two Historical Buildings in Europe(2020-12-04)Farsangi, E.N. and Bogdanovic, A. and Rakicevic, Z. and Poposka, A. and Stojmanovska, M. - 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, The need of integrated renovation of the existing building stock in North Macedonia(Informa UK Limited, 2020-08-06);