Abstract
This study evaluated the lateral and overturning resistance of wind turbine foundations reinforced with piles on bedrock through model experiments. In particular, changes in lateral and overturning resistance of wind turbine foundations were analyzed according to cross-sectional size and the presence of piles of wind turbine foundations. As a result, by reducing the cross-section, the lateral resistance of the pile-reinforced wind turbine foundation was compared to the existing wind turbine foundation with large cross-sections and was shown to be 1.68 times greater. In the case of vertical displacements affecting overturning, the safety of overturning was also greater, as the vertical displacement of the pile-reinforced wind turbine foundation was 36% smaller than the existing wind turbine foundation. As a result of the unidirectional cyclic load on a pile-reinforced wind turbine foundation, lateral resistance value was similar to that of the static load in target displacement value, and it showed that the elastic resilience was very large due to pile reinforcement. According to the bending moment measurement of piles embedded in wind turbine foundations and bedrock, bending moments were large in the order of the front row, the right-hand row, and the back row, while the maximum bending moment generation was found on the boundary surface of the wind turbine foundation and the rubble mound layer for the front row, as well as on the boundary surface of the rubble mound layer and bedrock for the right-hand row and back row.
Highlights
To verify the effectiveness the(a) wind turbine foundation reinforced with piles, the method of model experiments was to install bedrock and install an embedded rock layer, 2.4
This study conducted model experiments to examine the lateral resistance of the wind turbine foundations reinforced with piles on bedrock and the member force of piles
The results are as follows: (1) Comparing the lateral resistance of existing wind turbine foundations with large cross-sections (Case 1) and a wind turbine foundation reinforced with piles (Case 3), our study showed a similar tendency to change the lateral resistance force up to the initial
Summary
For the enlargement of offshore wind turbines, it is important to determine the economic foundation form due to the increase in the foundation construction costs of offshore wind turbine structures. In the case of offshore wind turbine structures, the lateral resistance and overturning of structures are important due to wind and wave forces. There is a need for the activities of offshore wind turbine structures that can be generated due to lateral loads, especially for measures that ensure stability in relation to overturning. In order to increase the economic feasibility and stability of lateral resistance due to enlargement of offshore wind turbine structures, this study examined a new method of reducing the cross-section of wind turbine foundations to reinforce the gap between foundation and bedrock with piles
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