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http://dx.doi.org/10.12652/Ksce.2021.41.1.0001

An Experimental Study on Reinforcement Method for Reuse of Onshore Wind Turbine Spread Footing Foundations  

Song, Sung Hoon (Korea Institute of Civil Engineering and Building Technology)
Jeong, Youn Ju (Korea Institute of Civil Engineering and Building Technology)
Park, Min Su (Korea Institute of Civil Engineering and Building Technology)
Kim, Jeong Soo (Korea Institute of Civil Engineering and Building Technology)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.41, no.1, 2021 , pp. 1-11 More about this Journal
Abstract
In order to reuse existing onshore turbine foundations, it is important to redesign and reinforce the existing foundations according to the upgraded tower diameter and turbine load. In the present study, a slab extension reinforcement method and structure details of an anchorage part were examined in consideration of the reuse of spread footings, which are the most widely used foundation type in onshore wind turbine foundations. Experiments were conducted to evaluate the load resistance performance of a reinforced spread footing according to structure details of an anchorage part. The results showed that (1) the strength of an anchorage part could be increased by more than 30 % by adding reinforcement bars in the anchorage part, (2) pile-sleeves attached to an anchor ring contributed to an increase in rotational stiffness by preventing shear slip behavior between the anchor ring and the concrete, and (3) slab connectors contributed to an increase in the strength and deformation capacity by preventing the separation of new and old concrete slabs.
Keywords
Repowering; Spread footing; Design of anchorage part; Connector; Concrete cone failure;
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