RETROFITTING FOR RESILIENCE: SEISMIC REHABILITATION AND LIFE CYCLE COST ANALYSIS OF A REINFORCED CONCRETE SCHOOL IN NICOSIA AFTER THE 2023 TURKEY EARTHQUAKES

Abstract

In 2023, Turkey was hit by a devastating doublet of earthquakes, measuring 7.7 and 7.6 in magnitude, resulting in widespread destruction of residential and public infrastructure. In the aftermath, the Turkish Republic of Northern Cyprus initiated a project aimed at rehabilitating educational facilities. This paper investigates the rehabilitation efforts carried out at Atatürk Technical High School in Nicosia. To assess the building's seismic resilience, a nonlinear time-history analysis was performed using 11 mainshock-aftershock sequences to evaluate its lateral load resistance and potential plastic deformations. As part of the rehabilitation, shear walls and steel X-braced frames were added to the lateral load-resisting system, with their effectiveness being examined. Post-retrofit results demonstrate substantial improvements: maximum roof displacement and drift ratios decreased by 70 to more than 90% for different blocks and directions, and plastic hinge formation shifted predominantly to the Immediate Occupancy state. Although added stiffness led to moderate increases in floor acceleration, the retrofit strategy dramatically reduced human-related losses, with fatality costs decreasing by over 90%. The rehabilitation cost of all blocks was investigated and found to be less than 15% of rebuilding costs. While non-structural and downtime-related losses increased, overall safety- related economic outcomes were significantly enhanced.

Keywords

• Case Study
• Seismic Rehabilitation
• School Building
• Performance-based Design
• Life Cycle Cost Analysis

References

1. W. Bank, "Global Rapid Post-Disaster Damage Estimation (GRADE) Report- Mw 7.8 Türkiye-Syria Earthquake – Assessment of the Impact on Syria," 2023.
2. B. Atmaca, M. Emin Arslan, M. Emiroğlu, and A. Can Altunışık, "On the earthquake-related damages of civil engineering structures within the areas impacted by Kahramanmaraş earthquakes," Journal of Structural Engineering & Applied Mechanics, vol. 6, 2023, doi: 10.31462/jseam.2023.02098116.
3. T. P. Doğan, H. Kalkan, Ö. Aldemir, M. Ayhan, M. Böcek, and Ö. Anıl, "Investigation of RC structure damages after February 6, 2023, Kahramanmaraş earthquake in the Hatay region," Bulletin of Earthquake Engineering, vol. 22, no. 10, pp. 5201-5229, 2024/08/01 2024, doi: 10.1007/s10518-024-01965-2.
4. S. Babaei and F. Karimi Ghaleh Jough, "A Comprehensive Evaluation of Tuned Vertical Isolation System for Seismic Risk Mitigation," Journal of Applied Engineering Sciences, vol. 14, no. 1, pp. 27-34, 2024, doi: doi:10.2478/jaes-2024-0004.
5. T. C. C. S. v. B. Başkanlığı, "2023 Kahramanmaraş ve Hatay Depremleri Raporu," T.C. Cumhurbaşkanlığı Strateji ve Bütçe Başkanlığı, Ankara, Turkey2023, Available: https://www.sbb.gov.tr/wp-content/uploads/2023/03/2023-Kahramanmaras-ve-Hatay-Depremleri-Raporu.pdf.
6. E. Damcı, R. Temür, Z. Kanbir, Ç. Şekerci, and E. Öztorun Köroğlu, "Comprehensive investigation of damage due to 2023 Kahramanmaraş Earthquakes in Türkiye: Causes, consequences, and mitigation," Journal of Building Engineering, vol. 99, p. 111420, 2025/04/01/ 2025, doi: https://doi.org/10.1016/j.jobe.2024.111420.
7. S. Apostolaki, S. Karahan, E. Riga, G. Tsinidis, C. Gokceoglu, and K. Pitilakis, "Seismic performance of tunnels and verification of available seismic risk models for the 2023 Kahramanmaraş earthquakes," Tunnelling and Underground Space Technology, vol. 156, p. 106185, 2025/02/01/ 2025, doi: https://doi.org/10.1016/j.tust.2024.106185.
8. E. Altunsu, O. Güneş, S. Öztürk, S. Sorosh, A. Sarı, and S. T. Beeson, "Investigating the structural damage in Hatay province after Kahramanmaraş-Türkiye earthquake sequences," Engineering Failure Analysis, vol. 157, p. 107857, 2024/03/01/ 2024, doi: https://doi.org/10.1016/j.engfailanal.2023.107857.

9. A. Ihsan Turan, A. Celik, A. Kumbasaroglu, and H. Yalciner, "Assessment of reinforced concrete building damages following the Kahramanmaraş earthquakes in Malatya, Turkey (February 6, 2023)," Engineering Science and Technology, an International Journal, vol. 54, p. 101718, 2024/06/01/ 2024, doi: https://doi.org/10.1016/j.jestch.2024.101718.
10. Y. Yenginar, B. Fidan, and M. Olgun, "A case study: cost-benefit and risk analyses of gabion wall for rockfall protection method in Bozkir, Turkey," (in en), Konya Journal of Engineering Sciences, vol. 12, no. 4, pp. 865-885, December 2024, doi: 10.36306/konjes.1510650.
11. A. E. Sever, P. Usta, E. Şakalak, and C. Ünveren, "Examination of the seismic behavior of the historical Yeşildere bridge," (in en), Konya Journal of Engineering Sciences, vol. 12, no. 2, pp. 432-450, June 2024, doi: 10.36306/konjes.1427898.
12. Ü. İstanbul Teknik, "2023 Şubat 2023 Deprem Son Raporu," İstanbul Teknik Üniversitesi, Istanbul, Turkey2023, Available: https://haberler.itu.edu.tr/docs/default-source/default-document-library/2023_itu_subat_2023_deprem_son_raporu.pdf?sfvrsn=1583fe76_2.
13. M. Kamanli et al., "February 6 2023 Kahramanmaraş Earthquakes Hatay" Konya Technical University, 2023.
14. İ. Kazaz, "Evaluation of seismic performance, design and practice of frame-wall buildings in Türkiye after the 6 February 2023 Kahramanmaraş earthquakes," Journal of Building Engineering, vol. 99, p. 111557, 2025/04/01/ 2025, doi: https://doi.org/10.1016/j.jobe.2024.111557.
15. F. Karimi Ghaleh Jough and M. Golhashem, "Assessment of out-of-plane behavior of non-structural masonry walls using FE simulations," Bulletin of Earthquake Engineering, vol. 18, no. 14, pp. 6405-6427, 2020/11/01 2020, doi: 10.1007/s10518-020-00932-x.
16. Z. Qu, F. Wang, X. Chen, X. Wang, and Z. Zhou, "Rapid report of seismic damage to hospitals in the 2023 Turkey earthquake sequences," Earthquake Research Advances, vol. 3, no. 4, p. 100234, 2023/10/01/ 2023, doi: https://doi.org/10.1016/j.eqrea.2023.100234.
17. S. Babaei, A. Habib, M. Hosseini, and U. Yildirim, "Investigating the Inelastic Performance of a Seismic Code-Compliant Reinforced Concrete Hospital Under Long Sequence of Ground Motions Records," in Sustainable Civil Engineering at the Beginning of Third Millennium, Singapore, U. Türker, Ö. Eren, and E. Uygar, Eds., 2024// 2024: Springer Nature Singapore, pp. 364-373.
18. M. Ozturk, M. H. Arslan, G. Dogan, A. S. Ecemis, and H. D. Arslan, "School buildings performance in 7.7 Mw and 7.6 Mw catastrophic earthquakes in southeast of Turkey," Journal of Building Engineering, vol. 79, p. 107810, 2023/11/15/ 2023, doi: https://doi.org/10.1016/j.jobe.2023.107810.
19. T. Y. Altıok, M. Şevik, and A. Demir, "Seismic performance of retrofitted and non-retrofitted RC school buildings after the February 6th, 2023, Kahramanmaraş earthquakes," Bulletin of Earthquake Engineering, 2024/08/01 2024, doi: 10.1007/s10518-024-01941-w.
20. D. De León, L. Esteva, D. Delgado, and J. C. Arteaga, "Optimal reliability to retrofit structures damaged by earthquakes from the perspective of the life-cycle cost," Engineering Structures, vol. 321, p. 118913, 2024/12/15/ 2024.
21. Y. Kulthanaphanich, R. Permata, and S.-Y. Lin, "Life cycle assessment of integrated energy and seismic retrofits for existing buildings," Journal of Building Engineering, vol. 108, p. 112967, 2025/08/15/ 2025.
22. X. Yan, N. Rahgozar, and M. S. Alam, "Seismic life-cycle cost evaluation of steel-braced frames: Comparing conventional BRBF with emerging SCVDF and HBF systems," Engineering Structures, vol. 313, p. 118256, 2024/08/15/ 2024.
23. Y. K. Wen and Y. J. Kang, "Minimum Building Life-Cycle Cost Design Criteria. I: Methodology," Journal of Structural Engineering, vol. 127, no. 3, pp. 330-337, 2001/03/01 2001, doi: 10.1061/(ASCE)0733-9445(2001)127:3(330).
24. C. C. Mitropoulou and N. D. Lagaros, "Life-Cycle Cost Model and Design Optimization of Base-Isolated Building Structures," (in English), Frontiers in Built Environment, Original Research vol. 2, 2016-November-07 2016, doi: 10.3389/fbuil.2016.00027.
25. A. Elenas and K. Meskouris, "Correlation study between seismic acceleration parameters and damage indices of structures," Engineering Structures, vol. 23, no. 6, pp. 698-704, 2001/06/01/ 2001, doi: https://doi.org/10.1016/S0141-0296(00)00074-2.
26. Applied Technology Council. (1985). Earthquake damage evaluation data for California (ATC-13). Applied Technology Council.
27. Federal Emergency Management Agency. (1992). A benefit-cost model for the seismic rehabilitation of buildings (FEMA 227). Federal Emergency Management Agency.Prota Software. (2018).
28. OECD (2022), Life-Cycle Costing in Public Procurement in Hungary: Stocktaking of Good Practices, OECD Public Governance Reviews, OECD Publishing, Paris, https://doi.org/10.1787/8d90f627-en.
29. TBDY 2018. Türkiye Bina Deprem Yönetmeliği. Afet ve Acil Durum Yönetimi Başkanlığı, Ankara
30. Computers and Structures, Inc. (2023). SAP2000 Integrated Software for Structural Analysis and Design (Version 24). Berkeley, CA: Computers and Structures, Inc. Available at: https://www.csiamerica.com.