• Title/Summary/Keyword: Tripod 버켓기초

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Analysis of the Bearing Behavior of a Tripod Bucket Installed in Clay (점성토 지반에 설치된 Tripod 버켓기초의 지지거동 분석)

  • Kim, Sung-Ryul;eong, Jae-Uk;Oh, Myounghak;Kwon, Osoon
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.32 no.3C
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    • pp.105-111
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    • 2012
  • Bucket foundations, which are used in the foundations of offshore wind turbines, should be able to withstand large amounts of horizontal and moment loads. Tripod bucket foundation, which combines three single buckets, has been used to increase horizontal and moment capacities. This study performed numerical analysis using ABAQUS (2010), to analyze the group effect and the bearing capacity of a tripod bucket in clay. Parametric studies were performed varying the bucket spacing ratio S/D (S=spacing between the centers of the bucket and the tower; D=diameter of the bucket) and depth ratio L/D (L=embedded length of skirt). The applied constitutive models were a linear elastic perfectly plastic model with Tresca yield criteria for normally consolidated clay and an elastic model for buckets. Loading in the vertical, horizontal, and moment directions was simulated with an increase in each movement at a reference point. The bearing behavior and the capacities of a single and a tripod bucket were compared. Capacity evaluation method of the tripod bucket was suggested using the capacity of a single bucket.

Economic Feasibility of Bucket Foundation for Offshore Wind Farm (해상풍력발전 버켓기초공법의 경제성 평가)

  • Oh, Myoung-Hak;Kwon, O-Soon;Kim, Keun-Soo;Jang, In-Sung
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.4
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    • pp.1908-1914
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    • 2012
  • As the turbine capacity and the water depth of wind farms are increasing, the construction cost of substructures and foundations for offshore wind turbines is expected to increase. Since the installation of suction bucket foundation is achieved by both self-weight and applied suction, the construction generally does not require heavy equipment for penetration. This study provides an economic analysis on the tripod which have the bucket foundations and compares that the jacket foundation at 50m water depth on sand layer or soft layer. As the strength of the soil and the number of the foundation is increasing, the construction cost of the tripod with the bucket foundations is more economically feasible than the jacket foundation.

Estimation of Dynamic Characteristics of an Offshore Meteorological Tower using Ambient Measurements (상시계측을 통한 해상기상탑의 동적특성 평가)

  • Gyehee Lee;Le Quoc Cuong;Daejin Kwag
    • Journal of Wind Energy
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    • v.14 no.3
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    • pp.91-99
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    • 2023
  • In research conducted on a southwestern Korean offshore meteorological tower, acceleration datasets were gathered over half a year with time-history sensors. To enhance data credibility, a parallel measurement system was used for verification. A model of the tower was configured using beam elements, and with modifications accounting for added stiffness from auxiliary structures. Ground interactions were considered as calibrated springs based on soil layer properties. The tower's dynamic attributes and mass sensitivity were discerned using eigenvalue analysis. The structural natural frequency was consistent, with variations primarily due to new equipment adding approximately 1400 kgs. With free vibration damping assumptions, a damping ratio of roughly 1 % was derived.