Proceedings of the 44th Annual Conference on Deep Foundations, 2019, Chicago, IL, USA, (DFI)
Recent Developments in Wind Turbine Foundation Design: Post Tensioned Single Pier
Mohamed Alrowaimi, Ph.D., Amr Sallam, Ph.D., P.E., Xuebing Zheng, P.E., Ahmad Mohamed, Ph.D., and Mohsen Elsayed, P.E.
The foundation is an essential component of the wind turbine that ensures continued operation under stable and safe conditions. Both shallow and deep foundations are utilized to support wind turbines including gravity spread foundation, anchor foundation, pier or drilled shaft foundation and pile and pile cap foundations. Conventional methods were typically utilized to design the wind turbine foundations. With the advances in numerical modeling in the geotechnical field, foundation designers may utilize numerical analysis to design wind turbine foundations. Geotechnical numerical packages allow modeling structural components and soil-structure interaction that is usually neglected in conventional methods. Furthermore, the subsoil conditions, geometries, stress-strain behavior, boundary conditions and load staging can be modeled, minimizing the assumptions and generalization. This results in better understanding of the stress strain behavior of the foundation leading to optimized foundation designs. This paper includes a brief review of current foundations used to support wind turbines with an emphasis on post tensioned single pier foundations. The current conventional foundation design methodologies and state-of-the-art foundation design utilizing numerical modeling of the single pier foundation will be discussed. Two case histories where the single pier foundation, designed using numerical modeling, were utilized to support the wind turbines will be presented.
|article #3192; publication #1057 (AM-2019)|