Analyzing the Effects of Soil-Structure Interactions on the Static Response of Onshore Wind Turbine Foundations Using Finite Element Method

Document Type: Technical Notes


1 Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran

2 Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran.



The use of wind turbines to generate electricity has increased in recent years. One of the most important parts of a wind turbine is the foundation, which should be designed accurately because it is influenced by difference forces. Soil cannot carry tension stress; thus, when a wind turbine foundation is applied eccentricity forces, a gap appears between the soil and foundation. The gap will have no positive effect on the ultimate bearing capacity of the foundation. This must be considered when designing the dimensions of an onshore wind turbine on a spread foundation using finite element software in order to avoid error during analysis. In the current study, a spread foundation of an onshore wind turbine was simulated using ABAQUS and PLAXIS-3D software. Based on the results, the effects of Soil-Structure Interaction (SSI), eccentricity of forces, soil strength parameters and the foundation buried depth on static response of the foundation are discussed. The results indicate that the influence of soil-structure interaction is depend on magnitude of eccentricity of forces and depth of foundation, so that soil-structure interaction has little impact on settlement of foundation when eccentricity of forces is less than 1/6 of the diameter of the foundation and this has important effect when the eccentricity forces at an amount exceeding 1/6 of the diameter of the foundation. In addition, this effect decreases with increasing the foundation buried depth and independent of the soil strength parameters (φ´ and C).



Austin, S. and Jerath, S. (2017). "Effect of soil-foundation-structure interaction on the seismic response of wind turbines", Ain Shams Engineering Journal, 8(3), 323–331.

Bhattacharya, S., Nikitas, G., Arany, L. and Nikitas, N. (2017). "Soil-Structure Interactions (SSI) for offshore wind turbines", The Institution of Engineering and Technology, 24(16), 1-23.

Bowles, L. (1997). Foundation analysis and design, McGraw-hill.

Brinkgreve, R.B.J., Engin, E. and Swolfs, W.M. (2012). "Plaxis 3D 2012", Plaxis bv, the Netherlands.

Cabalar, A.F., Uyan, R.S. and Akbulut,N. (2016). "A Study of Foundation Design for Wind Turbines in Hasanbeyli, Turkey", Soil Mechanics and Foundation Engineering, 53(5), 298-303.

Das, B.M. (2002). Principles of Foundation Engineering, McGraw-Hill handbooks.

Ishihara, T., Ishii, H. and Nishio, M. (2011). Maximum wind loads on a wind turbine under operating conditions, European Wind Energy Association: Europe's Premier Wind Energy Event.

Ishii, H. and Ishihara, T. (2010). "Numerical study of maximum wind load on wind turbine towers under operating conditions", The Fifth International Symposium on Computational Wind Engineering (CWE2010), Chapel Hill, North Carolina, USA, May 23-27, pp. 1-8

Jamshidi Chenari, R., Ghorbani, A., Eslami, A. and Mirabbasi, F. (2018). "Behavior of piled raft foundation on heterogeneous clay deposits using random field theory", Civil Engineering Infrastructures Journal, 51(1), 35-54.

Kawai, H., Michishita, K. and Deguchi, A. (2008). "Design wind loads on a wind turbine for strong wind", Proceedings of the BBAA VI International Colloquium on: Bluff Bodies Aerodynamics and Applications, Milano, Italy, Vol. 2024.  

Lantz, E., Leventhal, M. and Baring-Gould, I. (2013). Wind power project repowering: Financial feasibility, decision drivers, and supply chain effects, National Renewable Energy Laboratory (NREL).

Meyerhof, G.G. (1951). "The ultimate bearing capacity of foundations", Géotechnique, 2(4), 301-332.

Mohamed, W. and Austrell, P.E. (2017). "A comparative study of three onshore wind turbine foundation solutions", Computers and Geotechnics, 94, 46-57.

Mohamed, W., Austrell, P.E. and Dahlblom, O. (2018). "A new and reusable foundation solution for onshore windmills", Computers and Geotechnics, 99(February), 14-30.

Morgan, K. and Ntambakwa, E. (2008). "Wind turbine foundation behavior and design considerations", Proceedings of the American Wind Energy Association Windpower Conference, Houston, Texas.

Morshedifard, A. and Eskandari-Ghadi, M. (2017). "Coupled BE-FE scheme for three-dimensional dynamic interaction of a transversely isotropic half-space with a flexible structure", Civil Engineering Infrastructures Journal, 50(1), 95-118.

Mortezaie, H. and Rezaie, F. (2018). "Seismic behavior and dissipated plastic energy of performance-based-designed high-rise concrete structures with considering soil–structure interaction effect", Civil Engineering Infrastructures Journal, 51(1), 199-215.

Mostafaeipour, A. and Abarghooei, H. (2008). "Harnessing wind energy at Manjil area located in north of Iran", Renewable and Sustainable Energy Reviews, 12(6), 1758-1766.

Niels, S.O. and Matti, R. (2005). The mechanics of constitutive modeling, Elsevier.

Potts, D. and Zdravkovic, L. (1999). Finite Element analysis in geotechnical engineering: Application, Vol. 1, Thomas Telford.

Ripa Alonso, T. and González Dueñas, E. (2014). "Cracks analysis in onshore wind turbine foundations", IABSE Symposium Report, 102(23), 1086-1092.

Salmasi, F., Mansuri, B. and Raufi, A. (2015). "Use of numerical simulation to measure the effect of relief wells for decreasing uplift in a homogeneous earth dam", Civil Engineering Infrastructures Journal, 48(1), 35‑45.

Schuppener, B. (2007). "Eurocode 7: Geotechnical design, Part 1: General rules-its implementation in the European member states", Proceedings of the 14th European Conference on Soil Mechanics and Geotechnical Engineering, Madrid, Spain, 24-27 September, 2, 279-289.

Svensson, H. (2010). "Design of foundations for wind turbines", M.Sc. Dissertation, Lund University.  

Szerző, Á. (2012). "Optimization of foundation solutions for wind turbines", Mathematical Modeling in Civil Engineering, 4, 215-225.

Terzaghi, K. (1951). Theoretical soil mechanics, JohnWiley & Sons, New York, 11-15.