Abstract
There are currently no models predicting localised stressing induced in monopole foundations resulting from pile driving installation. A scaled down test was conducted for both circular and faceted monopile, during which monopile stressing was measured. From the stress data gathered fatigue damage was estimated. Fatigue damage of the faceted geometry is significantly larger than that of the circular geometry. It is shown that in the worst case the fatigue damage incurred is still negligible compared to the full service life of the foundation. Suggestions for future developments are made, such developments can be helpful in providing greater understanding of the occasional cases where fatigue damage resulting from pile driving is not negligible and has perhaps resulted in failure.
Highlights
Monopile is a popular foundation design for wind turbine power generation systems
The reference for the angular orientation is the axis running through the centre of the test piece
The data shows that during the main impulse φ is almost 90 ̊, which means that the maximum principal stress σ1 is in the circumferential direction of the monopile
Summary
Monopile is a popular foundation design for wind turbine power generation systems. Main advantage of this type of foundation is its simplicity in both fabrication and installation. Conventional monopile design consists of a cylindrical pipe like structure constructed from steel plates that are rolled and longitudinally welded into cans. The cans are stacked and circumferentially welded to make up the conventional monopile. The thickness of plate can be varied from section to section in proportion with the in-service stressing at specific locations. Some of the more costly designs include conical sections to assist joining of the wind turbine to the foundation
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