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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >A compliant guyed system for deep-sea installations of offshore wind turbines: Concept, design insights and dynamic performance
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A compliant guyed system for deep-sea installations of offshore wind turbines: Concept, design insights and dynamic performance

机译：适用于海上风机深海安装的合规拉丝系统：概念，设计见解和动态性能

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The paper explores the potential of a cost-efficient and easy-to-install foundation scheme for Mega-Turbines in seismic regions. The envisioned system comprises a compliant tower, tethered to the ground with an array of four pretensioned cables moored to the seabed by suction anchors. To facilitate installation, a single pinned connection is implemented at the tower base, which is founded on a circular shallow footing. Compared to conventional solutions, the studied scheme offers the necessary support without resource to massive and difficult to construct foundations. By eliminating the moment transfer at the tower foundation, its design requirements are substantially reduced. The efficacy of the proposed solution is demonstrated by investigating the performance of the NOWITECH 10 MW reference turbine installed at 50 m water depth, in the seismically active region of North-Western Adriatic. The entire soil-foundation-structure system is modelled in 3D, employing the finite element method. After confirming the acceptable performance of the guyed system against ULS and SLS conditions (even when allowing 3P mechanical vibrations to resonate with the oscillation of the turbine tower), its seismic response is evaluated. Under seismic loading, the guyed system is shown to be resilient, sustaining the seismically-induced loading with controlled displacements at the cable connection point, protecting the tower from excessive distress and undesirable inelastic deformations. The anchoring is also shown to have acceptable performance, with the maximum attained tension being much lower than the pullout capacity of the suction caisson; the seismically induced deformations are negligible. Finally, the seismic performance of the taut mooring lines is also shown to be satisfactory. Although a condition of "complete slack" may arise momentarily at the lee-ward cable, structural stability is not compromised.
机译：本文探讨了在地震区为大型涡轮机提供具有成本效益且易于安装的基础方案的潜力。设想的系统包括一个顺从的塔架，该塔架由四根通过吸力锚固定在海床上的预应力电缆束缚在地面上。为了便于安装，在塔架基座上实现了单个销钉连接，该基座位于圆形浅底座上。与常规解决方案相比，所研究的方案在没有资源的情况下为庞大且难以构建的基础提供了必要的支持。通过消除塔架基础处的力矩传递，可以大大降低其设计要求。通过对西北亚得里亚海地震活跃区中安装在水深50 m的NOWITECH 10 MW参考涡轮机的性能进行研究，证明了该解决方案的有效性。整个土壤-基础-结构系统采用有限元方法进行3D建模。在确认牵引系统在ULS和SLS条件下的可接受性能（即使允许3P机械振动与涡轮机塔架的振动产生共振）后，也要评估其地震响应。在地震荷载作用下，拉索系统表现出弹性，可以在电缆连接点处以可控制的位移来承受地震诱发的荷载，从而防止塔架遭受过度的遇险和不良的非弹性变形。还显示出锚固具有可接受的性能，最大获得的拉力大大低于吸水沉箱的拉出能力。地震引起的变形可以忽略不计。最后，拉紧的系泊缆的抗震性能也显示令人满意。尽管在背风电缆处可能会短暂出现“完全松弛”的情况，但结构稳定性不会受到损害。

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