Influence of the Skirt on the Seismic Response of Bucket Foundations for Offshore Wind Tower Using Dynamic Centrifuge Model Tests

2016 ◽  
Author(s):  
Leonardo T. Olalo ◽  
Yun Wook Choo ◽  
Kyung-Tae Bae
Keyword(s):  
Seismic Response ◽  
Seismic Behavior ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Peak Acceleration ◽  
Bucket Foundation ◽  
Centrifuge Model ◽  
Centrifuge Tests ◽  
Aspect Ratios ◽  
Centrifuge Model Tests

The influence of skirt to the seismic behavior of the bucket foundation supporting offshore wind turbine was analyzed by performing dynamic centrifuge tests. Three types of bucket foundation with aspect ratios (length of the skirt/diameter of the foundation) of 0.50, 0.75 and 1.00 were tested. Kobe and El Centro earthquakes were used as excitation patterns. Clean sand was used to simulate the soil deposit. Peak acceleration, settlement and tilting of foundations on drained sand condition were analyzed and compared. The bucket foundation with the longest skirt accelerated the most at the platform level and experienced the least degree of tilting and normalized settlement. Obtained results were expected to contribute for a better understanding on the performance of bucket foundation during an earthquake.

Offshore Wind Turbine Mono-Bucket Foundations in Sand

2021 ◽  
Author(s):  
Han Eng Low ◽  
Fangyuan Zhu ◽  
Henning Mohr ◽  
Phillip Watson ◽  
Carl Erbrich ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Large Rotation ◽  
Bucket Foundation ◽  
Dense Sand ◽  
Centrifuge Model ◽  
Centrifuge Tests ◽  
Rotational Response ◽  
Centrifuge Model Tests

Abstract Single (or mono) suction buckets have been put forward by others as possible offshore wind turbine (OWT) foundations. This paper presents a series of centrifuge model tests conducted in dense sand to investigate their monotonic response for a range of drainage conditions. The results from the centrifuge tests suggest that the mono-bucket rotational response at large rotation in dense sand is dependent on drainage conditions but does not seem to be affected by the contact condition between the bucket invert and the seabed. A final comparison between results from an equivalent set of uplift tests suggests, however, that multi-bucket foundation systems are likely to be more efficient foundation solutions, although suggestions are made which might improve mono-bucket foundation response.

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