Institute of Earthquake Engineering and Engineering Seismology

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    Nonlinear analysis of an RC frame structure considering the effects of embedment on soil–structure interaction
    (Faculty of Civil Engineering and Architecture Osijek, 2025-12-03)
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    Bojadjiev, Jordan
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    Experimental Verification of Innovative, Low-Cost Method for Upgrading of Seismic Resistance of Masonry Infilled Rc Frames
    (MDPI AG, 2025-07-31)
    Bojadjiev, Jordan
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    Necevska Cvetanovska, Golubka
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    Varevac, Damir
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    Bojadjieva, Julijana
    <jats:p>For the past few decades, during each disastrous earthquake, severe damage and poor seismic performance of masonry infilled RC frames, including many newly designed ones, have been reported extensively. Inherent problems related to analysis and design methods for tight-fit infilled frame structures have not yet been solved and are recognized as being far from satisfactory in terms of completeness and reliability. The primary objective of this research was to propose and test an innovative method that can effectively mitigate undesirable interaction damage to masonry infilled RC frame structures. This proposed technical solution consists of connection of the infill panel to the bounding columns with steel reinforcement connections deployed in mortar layers and anchored to the columns. This is practical, cheap and easy to implement without any specific technology, which is especially important for developing countries. A three story, two bay RC building model with the proposed connection implemented on the infill walls was designed and tested on the shake table at IZIIS in Skopje, N. Macedonia. The test results and design guidelines/recommendations from the proposed research are also expected to benefit the infrastructural development in other countries threatened by earthquakes, preferably in the Balkan and the Mediterranean region.</jats:p>
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    Kinematic SSI effects on seismic performance of RC structures
    (Croatian Association of Civil Engineers, 2024-09)
    Petrov, Nikola
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    Bojadjieva, Julijana
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    Bojadjiev, Jordan
    <jats:p>In seismic regions, understanding soil–structure interaction (SSI) is crucial. This study examines the SSI effects on a six-storey RC-frame building using American guidelines for soil types B and C as per Eurocode 8. Structural responses of a constant structural system under various soil types and embedment conditions are compared, revealing significant influences on seismic behaviour. The study employs linear-elastic analysis to demonstrate that local soil and embedment conditions decrease base shear forces but increase total horizontal displacements and inter-storey drifts. This study highlights the importance of considering local soil conditions and embedment configurations to ensure structural resilience in earthquake-prone areas.</jats:p>