【摘要】 针对深远海超大容量风力发电机组基础过渡段设计的优化需求，本文基于有限元软件，构建了8.3 MW风机四桩导管架基础斜箱梁式过渡段模型，进行了系统的结构静力与疲劳分析。研究结果表明：该过渡段在整体上表现出较低的疲劳损伤水平，但在箱梁与主筒体焊接部位及箱梁与主腿焊接部位存在局部疲劳损伤超限的现象（优化前最大疲劳损伤值为4.458）。为量化优化效果，本文通过控制单一变量法开展多组优化方案的数值模拟，形成“局部加厚+弧形肘板+打磨过渡+竖向支撑”的组合优化体系。首先，在设计阶段应对主筒体与箱梁顶板交界区域进行局部加厚处理（厚度从70 mm增至90 mm），或在该区域内外按500 mm间距布置弧形肘板，可使该区域应力降低15%～20%；其次，应确保构件形状平滑过渡，避免尖锐边缘和截面突变，并对所有结构尖锐交界处进行打磨处理（将过渡角从15°优化至30°），可减少应力集中30%以上；最后，在箱梁侧板表面按800 mm间距布置竖向支撑，可使侧板刚度提升25%，有效防止屈曲现象的发生。这些优化措施的实施将使过渡段局部疲劳损伤降至1.0以下，结构可靠性提升40%以上，且经对比，组合优化方案的综合效益优于单一优化措施（单一加厚仅能将疲劳损伤降至1.245，单一肘板疲劳损伤降至1.186），有助于显著提高深远海风电导管架基础过渡段的设计质量和运行可靠性，为深远海风电场的开发提供有力支持。更多还原

【Abstract】 To address the optimization requirements for the design of the transition section of the foundation for ultra-large-capacity wind turbines in deep and far seas, this study established a model of the inclined box-girder transition section for an 8.3 MW wind turbine’s fourpile jacket foundation using finte element software, and conducted systematic structural static and fatigue analyses. The research results show that the transition section exhibits a relatively low overall fatigue damage level; however, localized fatigue damage exceeds the allowable limit at the welded joints between the box girder and the main cylinder, as well as between the box girder and the main legs(with a maximum fatigue damage value of 4.458 before optimization). To tackle this issue, specific design and application recommendations are proposed herein: First, during the design phase, local thickening treatment should be applied to the junction area between the main cylinder and the box girder ’s top plate(increasing the thickness from 70 mm to 90 mm), or arc-shaped gusset plates should be ar ranged at 500 mm intervals both inside and outside this area-either measure can reduce the stress in this region by 15%-20%. Second,smooth transitions of component shapes should be ensured to avoid sharp edges and abrupt cross-sectional changes; all sharp structural junctions should be polished(optimizing the transition angle from 15° to 30°), which can reduce stress concentration by more than 30%.Finally, it is recommended to arrange vertical supports at 800 mm intervals on the surface of the box girder ’s side plates, which can increase the stiffness of the side plates by 25% and effectively prevent buckling. The implementation of these optimization measures will reduce the localized fatigue damage of the transition section to below 1.0 and improve the structural reliability by over 40%, which contributes significantly to enhancing the design quality and operational reliability of the transition section for deep-sea wind turbine jacket foundations and provides strong support for the development of deep and far-sea wind farms.更多还原