Segmental Hollow Concrete Filled FRP Tubes (CFFT) for Wind Turbine Towers

Watfa A., Green M., Fam A., Noel M.

10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering (CICE), İstanbul, Turkey, 8 - 10 December 2021, vol.198, pp.472-483 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 198
  • Doi Number: 10.1007/978-3-030-88166-5_40
  • City: İstanbul
  • Country: Turkey
  • Page Numbers: pp.472-483
  • Keywords: FRP, Post-tensioning, Segmental construction, Concrete, CFFT, Wind turbine towers
  • Istanbul Technical University Affiliated: No


Concrete-filled fibre-reinforced polymer (FRP) tubes (CFFTs) have been shown to be effective as both compression and flexural members in bridges. The main objective of this research is to extend this design concept to wind turbine towers. This study aims to evaluate the flexural performance of segmental and non-segmental hollow post-tensioned CFFTs (PT-CFFTs) through an experimental investigation. Four large-scale specimens have been constructed and will be tested under three-point bending, including three segmental hollow PT-CFFT specimens and one non-segmental hollow PT-CFFT control specimen. The specimens have been designed to study the influence of the following parameters on the performance of tapered hollow CFFT wind turbine towers subjected to bending loads: segmental construction methods for scaled wind turbine towers, contribution of outer GFRP tubes, and overlapping length between consecutive CFFT segments. The GFRP tube combined with the post-tensioned concrete system is intended to improve the constructability and structural efficiency of small scale wind turbines for remote areas such as the Canadian North. The optimal overlap length between two GFRP tubes required to develop the full flexural capacity of the CFFT system will be determined experimentally, and the feasibility of combining GFRP tubes, prestressing systems, and segmental construction in tapered wind turbine towers will be evaluated. In this paper, the relevant literature is reviewed and the preliminary experimental progress is presented.