Damage Characteristics and Seismic Performance of Post-2018 Reinforced Concrete Buildings: Field Evidence from the 2023 Kahramanmaraş Earthquakes

Abstract

The Kahramanmaraş earthquakes on February 6, 2023, provided a unique field environment for evaluating and comparing the performance of reinforced concrete (RC) buildings constructed in different code periods. This study investigates the seismic damage characteristics of post-2018 reinforced concrete buildings constructed in accordance with the Turkish Building Earthquake Code (TBEC-2018) by comparing them with pre-1999 structures. Official post-earthquake damage assessment data collected from the provinces of Gaziantep, Kahramanmaraş, and Hatay were used. A core dataset of 120 post-2018 RC buildings with complete attributes was examined alongside 130 pre-1999 reference buildings. The buildings were classified according to the number of stories and damage levels, and statistical analyses and field observations were performed. The findings show that post-2018 buildings have significantly lower collapse rates compared to pre-1999 stock, but no homogeneous performance was observed within the group. Specifically, it was found that the failure rate increased significantly with the number of stories; this rate, which was 18.4% in 1-4-story buildings, reached 50.0% in buildings with nine or more stories. Observed failures were most frequently associated with structural irregularities and configuration-related asymmetries, including soft-story behavior, short-column effects, and overhanging upper stories. While TBEC-2018 improves overall collapse prevention capacity, structural configuration vulnerabilities and implementation deficiencies continue to elevate seismic risk in modern buildings.

Keywords

• 2023 Kahramanmaraş earthquakes
• Reinforced concrete buildings
• Seismic damage assessment
• TBEC-2018
• Structural irregularities
• Failure mechanisms

References

1. Altunişik, A. C., Arslan, M. E., Kahya, V., Aslan, B., Sezdirmez, T., Dok, G., ... & Nas, M. (2023). Field observations and damage evaluation in reinforced concrete buildings after the February 6th, 2023, Kahramanmaraş–Türkiye Earthquakes. Journal of Earthquake and Tsunami, 17(06), 2350024.
2. Arslan, M. H., & Korkmaz, H. H. (2007). What is to be learned from damage and failure of reinforced concrete structures during recent earthquakes in Turkey? Engineering Failure Analysis, 14(1), 1–22. https://doi.org/10.1016/j.engfailanal.2006.01.003
3. Dal Zilio, L., & Ampuero, J. P. (2023). Earthquake doublet in Turkey and Syria. Communications Earth & Environment, 4(1), 71. https://doi.org/10.1038/s43247-023-00746-5
4. Demirel, I. O., Yakut, A., & Binici, B. (2022). Seismic performance of mid-rise reinforced concrete buildings in Izmir Bayrakli after the 2020 Samos earthquake. Engineering Failure Analysis, 137, 106277.
5. Dilsiz, A., Kocaman, İ., Mercimek, Ö., Ismail, S.H., Çelik, A. and Anıl, Ö., (2025). Field observations and numerical modeling of the collapse mechanism of the Habibi Neccar Mosque during the 2023 Kahramanmaraş earthquakes. Engineering Failure Analysis, 179, p.109767.
6. Disaster and Emergency Management Authority (AFAD). (2023). 6 February 2023 Kahramanmaraş earthquakes evaluation report. https://www.afad.gov.tr
7. Dogangun, A. (2004). Performance of reinforced concrete buildings during the May 1, 2003 Bingöl earthquake in Turkey. Engineering Structures, 26(6), 841–856. https://doi.org/10.1016/j.engstruct.2004.02.005
8. Erbaş, Y., Mercimek, Ö., Anıl, Ö., Çelik, A., Akkaya, S.T., Kocaman, İ. and Gürbüz, M., (2025). Design deficiencies, failure modes and recommendations for strengthening in reinforced concrete structures exposed to the February 6, 2023 Kahramanmaraş Earthquakes (Mw 7.7 and Mw 7.6). Natural Hazards, 121(3), pp.3153-3194.

9. Erdik, M., Tümsa, M. B. D., Pınar, A., Altunel, E., & Zülfikar, A. C. (2023). A preliminary report on the February 6, 2023 earthquakes in Türkiye. Research Briefs.
10. Gurbuz, T., & Cengiz, A. (2025). Structural damages during the February 06, 2023 Kahramanmaraş earthquakes in Turkey. Soil Dynamics and Earthquake Engineering, 191, 109214.
11. Kazaz, İ. (2025). Evaluation of seismic performance, design and practice of frame-wall buildings in Türkiye after the 6 February 2023 Kahramanmaraş earthquakes. Journal of Building Engineering, 99, 111557.
12. Kocaman, I., Mercimek, Ö., Guerbuez, M., Erbaş, Y. and Anıl, Ö., (2024). The effect of Kahramanmaraş earthquakes on historical Malatya Yeni Mosque. Engineering Failure Analysis, 161, p.108310.
13. Melgar, D., Taymaz, T., Ganas, A., Crowell, B. W., Öcalan, T., Kahraman, M., ... & Altuntaş, C. (2023). Sub-and super-shear ruptures during the 2023 Mw 7.8 and Mw 7.6 earthquake doublet in SE Türkiye. https://doi.org/10.31223/X52W9D
14. Mercimek, Ö., (2023). Seismic failure modes of masonry structures exposed to Kahramanmaraş earthquakes (Mw 7.7 and 7.6) on February 6, 2023. Engineering Failure Analysis, 151, p.107422.
15. Ministry of Environment, Urbanization and Climate Change of the Republic of Türkiye, General Directorate of Disaster Damage Assessment. (2023). Post-earthquake building damage assessment data following the 6 February 2023 Kahramanmaraş earthquakes [Unpublished official dataset]. Ankara, Türkiye.
16. Moehle, J. P., & Deierlein, G. G. (2004). A framework methodology for performance-based earthquake engineering. In Proceedings of the 13th World Conference on Earthquake Engineering (Paper No. 679). Vancouver, Canada.
17. Özdemir, A. and Çakmak, C., 2024. Identifying Infill Wall Failures in Kahramanmaraş Earthquakes and Strategies for Performance Improvement. Duzce University Journal of Science and Technology, 12(4), pp.1862-1878.
18. Ozdemir, A., (2025). Examining the effect of structural characteristics of Antakya building stock on the damage level after the Kahramanmaraş earthquakes. Journal of Earthquake Engineering, 29(16), pp.3475-3504.
19. Serifoglu Yilmaz, C., Yilmaz, V., Tansey, K., & Aljehani, N. S. (2023). Automated detection of damaged buildings in post-disaster scenarios: a case study of Kahramanmaraş (Türkiye) earthquakes on February 6, 2023. Natural Hazards, 119(3), 1247-1271.
20. Sezen, H., Whittaker, A. S., Elwood, K. J., & Mosalam, K. M. (2003). Performance of reinforced concrete buildings during the August 17, 1999 Kocaeli, Turkey earthquake, and seismic design and construction practise in Turkey. Engineering Structures, 25(1), 103-114.
21. TBEC. (2018). Turkish building earthquake code. Disaster and Emergency Management Presidency.
22. Türer, A., (2026). Seismic performance of RC staircases in the 2023 Kahramanmaraş earthquakes: field observation, damage patterns and evacuation risk. Bulletin of Earthquake Engineering, 24(4), pp.2135–2159.
23. USGS. (2023). M 7.8 – Pazarcık earthquake, Kahramanmaraş earthquake sequence. United States Geological Survey. https://earthquake.usgs.gov
24. Vuran, E., Serhatoğlu, C., Timurağaoğlu, M. Ö., Smyrou, E., Bal, İ. E., & Livaoğlu, R. (2025). Damage observations of RC buildings from 2023 Kahramanmaraş earthquake sequence and discussion on the seismic code regulations. Bulletin of Earthquake Engineering, 23(3), 1153-1182.
25. Xu, N., Albanwan, H., Türer, A., Batarfi, A., Sezen, H. and Qin, R., 2026. A novel post-disaster damage assessment using generative AI: ground-level damage inference from aerial data after the 2023 Turkey Earthquakes. International Journal of Remote Sensing, 47(7), pp.3161-3179.
26. Yakut, A. (2004). Preliminary seismic performance assessment procedure for existing RC buildings. Engineering Structures, 26(10), 1447-1461.
27. Yan, K., Miyajima, M., Kumsar, H., Aydan, Ö., Ulusay, R., Tao, Z., ... & Wang, F. (2024). Preliminary report of field reconnaissance on the 6 February 2023 Kahramanmaras Earthquakes in Türkiye. Geoenvironmental Disasters, 11(1), 1-24.