In this work, advanced reliability assessment of OWT (offshore wind turbine) monopiles is proposed by combining reliability analysis method and SHM (structural health monitoring) / CM (condition monitoring) technology. A 3D (three-dimensional) parametric FEA (finite element analysis) model of OWT monopiles is developed, considering soil-structure interactions. A number of stochastic FEA simulations of OWT monopiles are performed, taking account of stochastic variables, such as wind loads, wave loads and soil properties. Multivariate regression is then used to post-process the FEA results, obtaining the performance functions expressed in terms of stochastic variables. After that, FORM (first order reliability method) is used to calculate the reliability index, evaluating the reliability of the OWT monopiles. In the presence of SHM/CM data, the reliability of monopile structures is reassessed and updated. The updated reliability index provides valuable information for decision making for inspection and maintenance of OWT monopiles. The application of the proposed advance reliability assessment method to a 45m-length OWT monopile is presented, showing great potential to reduce the OPEX (operating expenditure) of OWT monopiles by using the proposed method.
|Title of host publication||Proceedings of the Twenty-eighth (2018) International Ocean and Polar Engineering Conference : Sapporo, Japan, June 10-15, 2018|
|Publisher||International Society of Offshore and Polar Engineers|
|Number of pages||8|
|Publication status||Published - 30 Jul 2018|
|Event||28th International Ocean and Polar Engineering Conference - Sapporo, Japan|
Duration: 10 Jun 2018 → 15 Jun 2018
Conference number: 28
|Conference||28th International Ocean and Polar Engineering Conference|
|Period||10/06/18 → 15/06/18|
Kolios, A., & Wang, L. (2018). Advanced Reliability Assessment of Offshore Wind Turbine Monopiles by Combining Reliability Analysis Method and SHM/CM Technology. In Proceedings of the Twenty-eighth (2018) International Ocean and Polar Engineering Conference : Sapporo, Japan, June 10-15, 2018 (pp. 1412-1419). International Society of Offshore and Polar Engineers.