PSI - Issue 64

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ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 64 (2024) 908–917

SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Structural assesment and numerical analysis of existing reinforced concrete frame structure Galić Josip a , Vukić Hrvoje b *, Andrić Davor c a,b,c University of Zagreb Faculty of Architecture, Fra Andrije Kačića Miošića 26, Zagreb 10 000, Croatia Abstract The subject of this study is the presentation of in-situ tests on the existing structure and structural analysis of the Faculty of Political Sciences building at the University of Zagreb which sustained damage in the series of earthquakes that hit Zagreb and Petrinja in 2020, as well as the structural strengthening efforts undertaken thereafter. The load-bearing structure of this mid-20 th century building is a reinforced concrete frame system (column-beam). Filling between frames is masonry made of solid bricks. The floor structure is reinforced concrete ribbed slabs, characteristic of the construction period. Structure has a basement and six floors above ground. In-situ testing revealed that the compressive strength of concrete was at least 30.7 MPa, and tensile strength of steel reinforcement to that of B 240. It was determined that that the existing masonry walls did not have sufficient shear resistance due to the degradation of the bonding material. Numerical model was made considering the peak ground acceleration of a g /g = 0.249, and the importance factor of γ I = 1.2. The analysis showed that the existing building complied with 19% a g /g of today's applicable regulations for designing earthquake-resistant structures. The main strengthening included the installation of external steel trusses on both facades connected to the external column or facade frame, thus not affecting the existing floor plan. RC walls were added to side of main building volume in the transvers direction and to the staircase portion in both directions as additional bracing. Since the calculations assumed the behavior of the frame for the existing load-bearing structure of reinforced concrete beams and columns, the joints were additionally reinforced by wrapping them with CFRP fabric to enhance reinforcement, since these areas are very sensitive to seismic action. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers Keywords: earthquake, in situ tests, structural strenghtening, static analysis SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Structural assesment and numerical analysis of existing reinforced concrete frame structure Galić Josip a , Vukić Hrvoje b *, Andrić Davor c a,b,c University of Zagreb Faculty of Architecture, Fra Andrije Kačića Miošića 26, Zagreb 10 000, Croatia Abstract The subject of this study is the presentation of in-situ tests on the existing structure and structural analysis of the Faculty of Political Sciences building at the University of Zagreb which sustained damage in the series of earthquakes that hit Zagreb and Petrinja in 2020, as well as the structural strengthening efforts undertaken thereafter. The load-bearing structure of this mid-20 th century building is a reinforced concrete frame system (column-beam). Filling between frames is masonry made of solid bricks. The floor structure is reinforced concrete ribbed slabs, characteristic of the construction period. Structure has a basement and six floors above ground. In-situ testing revealed that the compressive strength of concrete was at least 30.7 MPa, and tensile strength of steel reinforcement to that of B 240. It was determined that that the existing masonry walls did not have sufficient shear resistance due to the degradation of the bonding material. Numerical model was made considering the peak ground acceleration of a g /g = 0.249, and the importance factor of γ I = 1.2. The analysis showed that the existing building complied with 19% a g /g of today's applicable regulations for designing earthquake-resistant structures. The main strengthening included the installation of external steel trusses on both facades connected to the external column or facade frame, thus not affecting the existing floor plan. RC walls were added to side of main building volume in the transvers direction and to the staircase portion in both directions as additional bracing. Since the calculations assumed the behavior of the frame for the existing load-bearing structure of reinforced concrete beams and columns, the joints were additionally reinforced by wrapping them with CFRP fabric to enhance reinforcement, since these areas are very sensitive to seismic action. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers Keywords: earthquake, in situ tests, structural strenghtening, static analysis © 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers

* Corresponding author. Tel.: +385-1-4639-320. E-mail address: hvukic@arhitekt.hr * Corresponding author. Tel.: +385-1-4639-320. E-mail address: hvukic@arhitekt.hr

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers 2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers

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