CYCLIC LOADING TESTS OF TLP MOORING PILES IN AN ACTUAL SEA AREA FOR OFFSHORE WIND

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  • 洋上風力への適用に向けたTLP係留基礎杭の実海域における繰返し引抜載荷実験

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<p> The introduction of floating offshore wind turbines is expected to expand, and one of the floating types is the TLP type. In this study, cyclic pull-out loading tests were conducted using large piles in an actual sea area to establish a method for evaluating the stability of TLP mooring foundation piles. Static pull-out tests were conducted on the first of the three test piles to determine the ultimate uplift resistance of the pile in the ground. For the remaining two piles, two types of cyclic pull-out tests were conducted at various loading levels. In both of the two types of cyclic pull-out tests in this study, the displacement of the piles during the loading process was small, and we have concluded there was no effect on the stability of the piles. When these results were plotted on a stability evaluation diagram from previous studies, the results were consistent with the proposed stability region and the load levels near its boundaries. This demonstrated the validity of the stability evaluation at the load levels assumed for the actual wind turbines.</p>

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