The effect of foundation type selection on approximate cost of reinforced concrete buildings: the role of soil classes and number of floors

Abstract

This study investigates the choice of foundation type, which is one of the factors affecting the approximate cost of rough construction of buildings with reinforced concrete structural systems. In the study, isolated, continuous and raft foundation types are discussed comparatively for buildings with different numbers of floors (1-4 floors above the basement) and different soil classes (ZB-ZE). In the literature, there is no study in which the effects of foundation type, number of floors and soil classes on the approximate cost of a building are analyzed together. This study aims to fill this gap in this field. Reinforced concrete design and analysis were performed using Protastructure 2022 software; concrete, formwork and reinforcing steel quantities were calculated, and approximate costs were calculated with the Republic of Türkiye Ministry of Environment, Urbanization and Climate Change 2024 Construction and Installation Unit Prices (TCÇŞİDB 2024) and the results were presented in tables and graphs. According to the study's findings, as the soil class improves, isolated foundations are more economical than other foundations. In contrast, the cost of isolated foundations increases significantly as the soil class deteriorates and the number of floors increases, while the cost difference between continuous foundation and raft foundation decreases.

Keywords

• foundation type selection
• approximate cost
• soil classes
• number of floors
• cost analysis

References

1. [1] P. Azimi, H. Gazi, and C. Alhan, “Effects of Soil Amplification Factors on the Seismic Performance Potential and Cost of Reinforced Concrete Structural Systems,” Teknik Dergi, vol. 30, no. 1, pp. 8803–8834, 2019, doi: 10.18400/tekderg.308431.
2. [2] M. Türkmen and H. Tekeli, “Effects of Local Soil Classification and Seismic Zone On the Cost of Building,” SDÜFBED, vol. 9, no. 3, 2005, doi:10.19113/sdufbed.51589.
3. [3] M. Türkmen, H. Tekeli, and A. Kuyucular, “Construction Costs of Multi Storey RC Buildings for Different Soil Classes and Structural Irregularities,” J. Fac.Eng.Arch. Selcuk Univ., vol. 21, no. 1, pp. 57–66, 2006, https://dergipark.org.tr/tr/pub/sujest/issue/23271/248396.
4. [4] A. Dorum, Ö. Özkan, and M. Erdal, “Effects of Different Earth Quake Areas and Different Soil Classes on Basic Structure Costs,” Selcuk University Journal of Engineering Sciences, vol. 5, no. 1, pp. 1–9, 2006, https://sujes.selcuk.edu.tr/sujes/article/view/20.
5. [5] S. Ü. Dikmen and S. Özek, “Effects of Soil Group on the Cost of Industrial Structures,” Teknik Dergi, vol. 22, no. 108, pp. 5543–5558, 2011, https://dergipark.org.tr/tr/pub/tekderg/issue/12751/155191.
6. [6] İ. Eroğlu and C. İpek, “Soil And Building Interaction Under Earthquake Loads,” International Journal of New Horizons In The Sciences, vol. 1, no. 1, pp. 18–27, 2023, doi: 10.5281/zenodo.8200563.
7. [7] Z. Y. İlerisoy and M. E. Tuna, “Effects of Plane Dimensions and Number of Storeys On the Cost of Rectangular-Plane Buildings Constructed with Tunnel Form,” MEGARON / Yıldız Technical University, Faculty of Architecture E-Journal, 2018, doi: 10.5505/megaron.2018.98698.
8. [8] A. Azhim and W. A. Prakoso, “Construction cost optimization of shallow foundation for sand soil in Indonesia,” MATEC Web of Conferences, vol. 270, p. 05005, Feb. 2019, doi: 10.1051/matecconf/201927005005.

9. [9] E. Azat, “The Effect of Different Foundation Types and Different Soil Improvement Techniques on Building Cost,” [Master Thesis], Bilecik Şeyh Edebali University, Bilecik, 2022.
10. [10] H. Karaca, “The influence of soil parameters of TEC-2019 over the amount of structural material used and roof drift of structures, a case Study,” Journal of Polytechnic, vol. 25, no. 2, pp. 467–475, 2022, doi: 10.2339/politeknik.680595.
11. [11] İ. Teştek, “Analysis and economical comparison of a multi-story structure having reinforced concrete and steel bearing system considering the soil classes defined in 2018 Turkey Building Earthquake Code,” [Master Thesis], Gümüşhane University, Gümüşhane, 2019.
12. [12] Ü. Gülçiçek, “Approximate rough construction cost estimation via the change of construction parameters,” [Master Thesis], Sakarya University, Sakarya, 2011.
13. [13] Y. Genç, “Cost Analysis on Residential Buildings Built in Different Earthquake Regions,” [Master Thesis], Harran University, Şanlıurfa, 2014.
14. [14] H. İnce, E. Toy and M. Tolon, “Influence of Local Soil Conditions on the Structural Design and Associated Costs,” International Journal of Engineering and Natural Sciences, vol. 1, no. 1, pp. 21–26, 2018, https://dergipark.org.tr/en/pub/ijens/issue/43155/523381.
15. [15] TBDY, “Supplement Principles for The Design of Buildings Under the Influence of Earthquakes.” Disaster and Emergency Management Presidency, Ankara, 2018.
16. [16] M. Kalkan, A. D. Kaçar, and O. Alptekin, “Ülkelerin Deprem Sonras Yeniden Yaplaşma Süreçlerinin Karşlaştrlmas: Çin, Şili ve Türkiye Örnekleri: Deprem Sonras Yeniden Yaplaşma Stratejileri,” Tasarim+ Kuram, vol. 16, no. 31, pp. 152–169, 2020, doi: 10.14744/tasarimkuram.2020.41275.
17. [17] TS 500, “Betonarme Yapıların Tasarım ve Yapım Kuralları,” Türk Standardları Enstitüsü. 2000.